Classification. By type of processing, rolled products are divided into: hot-rolled and forged; calibrated; with special finishing surfaces. -
Depending on the condition of the material, rolled products are produced: without heat treatment, heat treated - TO; cold-worked - NG (for calibrated rolled products and hard rolled products with special surface finishing).

Rolled products are produced in two surface quality groups:
2GP - mainly for hot pressure treatment; ,
ZGP - mainly for cold machining.

Steel grades: 08, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 58 (55pp), 60.
In the steel grade designation, the numbers indicate the average carbon content in hundredths of a percent.

The surface quality and requirements for cutting the ends of calibrated rolled products must comply with GOST 1051-73 groups B and C, with special surface finishing - GOST 14955-77 groups B, D and D.
The hardness (TB1) of long products without heat treatment should not exceed 255 HB; calibrated and with special surface finishing hardened - 269 NV.

Technical requirements. The mechanical properties and impact strength of rolled products are given in table. 3. Standards of Mechanical properties specified in table. 3, relate to rolled products with a diameter or thickness of up to 80 mm. For rolled products with a diameter or thickness over 80 mm, a reduction in the relative elongation by 2% and the relative contraction by 5% is allowed.
The macrostructure (MS) normalized in points is given in Table. 4.: The normalized mechanical properties (M2) of calibrated rolled products in the cold-worked or untreated state are given in table. 5.

3. Mechanical properties of rolled products in a normalized state (M1)

Notes:
1. Standards of mechanical properties given in table. 3, refer to rolled products with a diameter or thickness of up to 80 mm. For rolled products with a diameter or thickness over 80 mm, a reduction in relative elongation by 2% (abs.) and relative contraction by 5% (abs.) is allowed. Standards of mechanical properties for workpieces forged from rods with a diameter or thickness of over 120 to 250 mm for rolled products with a diameter or thickness of 90 to 100 mm must correspond to those given in Table. 3.
2. By agreement between the manufacturer and the consumer, for steel grades 25 - 60, a reduction in tensile strength by 20 MPa is allowed in comparison with the standards specified in Table. 3, while simultaneously increasing the elongation rates by 2% (abs.).

4 . Normalized macrostructure (RMS) of steel in points, no more

5. Standardized mechanical properties (M2) of calibrated rolled products

Rental range:
hot-rolled round grades 08-60 according to GOST 2590-88;
hot-rolled square - GOST 2591-88;
hot-rolled hexagonal - GOST 2879-88;
hot rolled strip -. GOST 103-76;
forged round and square - GOST 1133-71;
calibrated round - GOST 7417-75;
round with special surface finishing - GOST 14955-77.

Examples of symbols

Long-rolled products, round, of normal rolling accuracy (B), class II in curvature of unmeasured length (ND), with a diameter of 100 mm according to GOST 2590-88, made of steel grade. 30, with surface quality group 2GD. with mechanical properties according to (M1), with hardness according to (TV1), impact strength control, according to (KUV), with deburring (US), with hot upset test (65), without heat treatment;

Rolled strip, normal rolling accuracy (B), sickle shape class 2, deviation from flatness class 2, multiple measured length (CD), thickness 3 mm, width 90 mm according to GOST 103-76, from steel grade 45, with surface quality of the ZGI group , with mechanical properties according to (M1)^ with hardness according to (TB1), with normalized hardenability (HR), without heat treatment:

Calibrated rolled products, square, with a tolerance range of h11, a multiple of the measured length (CD), with a square side of 15 mm in accordance with GOST 8559-75, from steel grade 20, with surface quality of group B in accordance with GOST 1051-73, with mechanical properties in accordance with (MZ ), with hardness according to (TV2), ensuring weldability (GS), cold-worked (NG);

Examples of symbols that can be given in design documentation

Rolled products with special surface finishing: round, with tolerance range h11, unmeasured length (ND), diameter 8 mm, surface quality group B according to GOST 14955-77, made of grade 20 steel, with mechanical properties according to table. 5 (M2), about hardness according to, (TVZ), Cold-worked (NG):

5. Mechanical properties and hardness of hot-rolled and calibrated thermally untreated rolled carbon sulfur steel

6. Standardized hardness, HB, rolled products

GOST 1050-88 establishes general technical conditions for hot-rolled and forged long products from high-quality carbon structural steel grades 08, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 58 (55pp) and 60 with a diameter or thickness of up to 250 mm , as well as rolled products calibrated and with special surface finishing of all brands.
In terms of chemical composition standards, GOST 1050-88 applies to other types of rolled products, ingots, forgings, stampings made from steel grades listed above, as well as steel grades 05kp, 08kp, 08ps, 10kp, 10 ps, ​​11kp, 15kp, 15ps, 18kp , 20kp and 20ps.

• GOST 103-2006 Long-rolled hot-rolled steel strip. Assortment
• GOST 162-90 Vernier depth gauges. Specifications
• GOST 427-75 Metal measuring rulers. Specifications
• GOST 1051-73 Calibrated rolled products. General technical conditions
• GOST 1133-71 Forged steel round and square. Assortment
• GOST 1497-84 Metals. Tensile test methods
• GOST 1763-68 Steel. Methods for determining the depth of the decarbonized layer
• GOST 2216-84 Smooth adjustable clamp gauges. Specifications
• GOST 2590-2006 Hot-rolled round steel products. Assortment
• GOST 2591-2006 Hot-rolled square steel products. Assortment
• GOST 2789-73 Surface roughness. Parameters and characteristics
• GOST 2879-2006 Hot-rolled hexagonal long steel products. Assortment
• GOST 3749-77 Test squares 90°. Specifications
• GOST 4405-75 Hot-rolled and forged strips made of tool steel. Assortment
• GOST 5157-83 Hot-rolled steel profiles for various purposes. Assortment
• GOST 5378-88 Protractors with vernier. Specifications
• GOST 5639-82 Steels and alloys. Methods for identifying and determining grain size
• GOST 5657-69 Steel. Hardenability test method
• GOST 6507-90 Micrometers. Specifications
• GOST 7417-75 Calibrated round steel. Assortment
• GOST 7502-98 Metal measuring tapes. Specifications
• GOST 7564-97 Rental. General rules sampling, blanks and specimens for mechanical and technological tests
• GOST 7565-81 Cast iron, steel and alloys. Sampling method for determining chemical composition
• GOST 7566-94 Metal products. Reception, labeling, packaging, transportation and storage
• GOST 8559-75 Calibrated square steel. Assortment
• GOST 8560-78 Calibrated hexagonal rolled products. Assortment
• GOST 9012-59 Metals. Brinell hardness measurement method
• GOST 9013-59 Metals. Rockwell hardness test method
• GOST 9454-78 Metals. Test method for impact bending at low, room and elevated temperatures
• GOST 10243-75 Steel. Test methods and macrostructure evaluation
• GOST 12359-99 Carbon steels, alloyed and high-alloyed. Methods for determining nitrogen
• GOST 14955-77 High-quality round steel with special surface finishing. Specifications
• GOST 21120-75 Rods and blanks of round and rectangular cross-section. Ultrasonic flaw detection methods
• GOST 21650-76 Means for fastening packaged cargo in transport packages. General requirements
• GOST 22536.0-87 Carbon steel and unalloyed cast iron. General requirements for analysis methods
• GOST 22536.1-88 Carbon steel and unalloyed cast iron. Methods for determining total carbon and graphite
• GOST 22536.2-87 Carbon steel and unalloyed cast iron. Methods for determining sulfur
• GOST 22536.3-88 Carbon steel and unalloyed cast iron. Phosphorus determination methods
• GOST 22536.4-88 Carbon steel and unalloyed cast iron. Methods for determining silicon
• GOST 22536.5-87 Carbon steel and unalloyed cast iron. Methods for determining manganese
• GOST 22536.6-88 Carbon steel and unalloyed cast iron. Arsenic determination methods
• GOST 22536.7-88 Carbon steel and unalloyed cast iron. Methods for determining chromium
• GOST 22536.8-87 Carbon steel and unalloyed cast iron. Methods for determining copper
• GOST 22536.9-88 Carbon steel and unalloyed cast iron. Methods for determining nickel
• GOST 24597-81 Packages of packaged piece goods. Main parameters and dimensions
• GOST 26877-91 Metal products. Methods for measuring shape deviations
• GOST 27809-95 Cast iron and steel. Spectrographic analysis methods

G O S U D A R S T V E N N Y S T A N D A R T

S O S W A S S R

GENERAL TECHNICAL CONDITIONS

GOST 1050-88

Official publication

STATE COMMITTEE OF THE USSR

ON PRODUCT QUALITY MANAGEMENT AND STANDARDS

Moscow

UDC 669.14-422:006.354

Group B32

G O S U D A R S T V E N N Y S T A N D A R T S O Y W A S S S R

ROLLED SOLID, CALIBRATED, WITH SPECIAL SURFACE FINISHING FROM CARBON QUALITY STRUCTURAL STEEL

GOST
1050-88

General technical conditions

Carbon structural quality steel gauged bars with special surface finish. General specifications

OKP 09 5000, 11 4100, 11 5000

Valid from 01/01/91
until 01/01/96

Failure to comply with the standard is punishable by law

This standard establishes general technical conditions for hot-rolled and forged long products from high-quality carbon structural steel grades 08, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 58 (55pp) and 60 in diameter or thickness up to 250 mm, as well as rolled products calibrated and with special surface finishing of all brands.

In terms of chemical composition standards, the standard applies to other types of rolled products, ingots, forgings, stampings made of steel grades listed above, as well as steel grades 05kp, 08kp, 08ps, 10kp, 10ps, 11kp, 15kp, 15ps, 18kp, 20kp and 20ps .

1. MAIN PARAMETERS AND DIMENSIONS

1.1. The grades and chemical composition of steel according to the ladle sample must correspond to those given in table. 1.

Official publication

Reproduction is prohibited
© Standards Publishing House, 1989

Table 1

Notes:

1. According to the degree of deoxidation, steel is designated: boiling - kp, semi-calm - ps, calm - no index.

2. Steel grade 05kp is not allowed for use in newly created and modernized equipment.

1.1.1. The mass fraction of sulfur in steel should be no more than 0.040%, phosphorus - no more than 0.035%. For steel grades 11kp and 18kp used for cladding, mass fraction sulfur should be no more than 0.035%, phosphorus - no more than 0.030%.

1.1.2. The residual mass fraction of nickel in steel of all grades should not exceed 0.30%, copper in steel grades 11kp and 18kp - 0.20%, in steel of other grades - 0.30%.

1.1.3. In steel grades 35, 40, 45, 50, 55 and 60, intended for the production of patented wire, the mass fraction of manganese should be 0.30-0.60%, nickel - no more than 0.15%, chromium - no more than 0. 15%, copper - no more than 0.20%. The mass fraction of sulfur and phosphorus is in accordance with the requirements of the wire standards, but does not exceed the standards given in clause 1.1.1.

1.1.4. In steel grades 08ps, 10ps, 15ps and 20ps, intended for the production of rolled sheets for cold stamping, the mass fraction of manganese is allowed up to 0.25% at the lower limit.

1.1.5. In steel grades 08ps, 10ps, 15ps and 20ps, a mass fraction of silicon of less than 0.05% is allowed, provided that deoxidizers other than silicon are used in the required quantities.

1.1.6 The mass fraction of arsenic in steel is allowed to be no more than 0.08%.

1.1.7 The mass fraction of nitrogen in oxygen-converter steel should not exceed 0.006% for sheet metal and strips and 0.008% - for other types of rolled products.

1.2. In rolled products, billets, forgings and further processing products, deviations are allowed according to chemical composition from the standards given in table. 1, in accordance with table. 2.

Table 2

1.3. The range of rolled products must meet the requirements:
GOST 2590 - for hot-rolled rounds;
GOST 2591 or other regulatory and technical documentation - for hot-rolled square;
GOST 1133 - for forged round and square;
GOST 2879 - for hot-rolled hexagonal;
GOST 103 - for hot-rolled strip;
GOST 4405 - for forged strip;
GOST 7417 - for calibrated round;
GOST 8559 - for calibrated square;
GOST 8560 - for calibrated hexagonal;
normative and technical documentation - for calibrated strip;
GOST 14955 - with special surface finishing.
Examples of symbols are given in Appendix 1.

2. TECHNICAL REQUIREMENTS

2.1. Characteristics of the basic version

2.1.1. Rolled bars of unmeasured length with maximum deviations for normal dimensional accuracy, curvature, ovality and other requirements for shape, crescent shape and non-flatness of class 2 according to GOST 103 (for strip).

2.1.2. Calibrated rolled products of unmeasured length with maximum deviations for quality - h11, ovality - no more than maximum deviations in diameter.

2.1.3. Rolled products with special surface finishing of unmeasured length with maximum deviations for quality - h11, ovality - no more than half of the maximum deviations for diameter.

2.1.4. Long-rolled products without heat treatment, calibrated and with special surface finishing, cold-hardened - N or heat-treated (annealed, highly tempered, normalized, normalized with tempering, hardened with tempering) - T.

2.1.5. Long-rolled products of two groups of surface quality: a and b. Rolled products of surface quality group a are intended primarily for hot forming, group b - primarily for cold machining.

2.1.6. On the surface of rolled products of surface quality group A there should be no rolled bubbles, rolling films, sunsets, cracks, dirt, or stress cracks.

2.1.6.1. Defects on the surface must be removed by flat cutting or grinding, the width of which must be at least five times the depth.
The depth of cleaning defects, based on the actual size, should not exceed:
half the size tolerance - for rolled products with a size of less than 80 mm;
size tolerance - for rolled products with sizes from 80 to 140 mm;
5% of diameter or thickness - for rolled products ranging in size from 140 to 200 mm;
6% of diameter or thickness - for rolled products larger than 200 mm.
In one section of rolled products with a size (diameter or thickness) of more than 140 mm, no more than two strippings of maximum depth are allowed.

2.1.6.2. On the rolled surface, individual scratches, dents and ripples with a depth within half the size tolerance are allowed without cleaning, as well as rolled bubbles and dirt (hairs) with a depth not exceeding 1/4 of the size tolerance, but not more than 0.20 mm, counting from actual size.

2.1.7. On the surface of rolled products with surface quality group B, local defects with a depth not exceeding the minus maximum deviation per size are allowed for rolled products with a size of less than 100 mm; size tolerance - for rolled products measuring 100 mm or more.
The depth of defects is calculated from the nominal size.

2.1.8. Rolled products must be cut. Crumpled ends and burrs are allowed. The bevel of cutting long products up to 30 mm in size is not regulated, over 30 mm - should not exceed 0.1 of the diameter or thickness. Rolled sections up to 40 mm of unmeasured length may be produced with uncut ends.

2.1.9. The surface quality and requirements for cutting the ends of calibrated rolled products must comply with GOST 1051 groups B and C, with special surface finishing - GOST 14955 groups B, D and D.
In rolled products with special surface finishing, decarburization is not allowed.

2.1.10. The hardness of long products should not exceed 255 HB, calibrated and with special surface finishing - 269 HB.

2.1.11. The mechanical properties of rolled products must comply with the standards given in table. 3.

Table 3

Notes:

1. The standards of mechanical properties given in table. 3, refer to rolled products with a diameter or thickness of up to 80 mm. For rolled products with a diameter or thickness over 80 mm, a reduction in relative elongation by 2% (abs.) and relative contraction by 5% (abs.) is allowed. Standards of mechanical properties for workpieces forged from rods with a diameter or thickness of over 120 to 250 mm for rolled products with a diameter or thickness of 90 to 100 mm must correspond to those given in Table. 3.
2. By agreement between the manufacturer and the consumer, for steel grades 25-60, a reduction in tensile strength by 20 N/mm2 (2 kgf/mm2) is allowed in comparison with the standards specified in table. 3, while simultaneously increasing the elongation rates by 2% (abs.).

2.1.12. The macrostructure of rolled products should not have shrinkage cavities, looseness, bubbles, delaminations, internal cracks, slag inclusions and flakes.

2.2. Customer specifications

2.2.1. Rolled steel grades 20, 25, 30, 35, 40, 45, 50 with a mass fraction of boron of 0.002-0.006%.

In this case, the letter P is placed at the end of the brand designation.

2.2.2. Rolled steel from mild steel with a mass fraction of silicon of 0.17-0.27%.

2.2.3. Rental of cut lengths.

2.2.4. Rental of lengths that are multiples of the measured length.

2.2.5. Calibrated rolled products of length limited within unmeasured limits.

2.2.6. Long products in a heat-treated state.

2.2.7. Rolled products with surface quality of group G - without rolled bubbles and contaminants (hairs).
Rolled products are intended primarily for hot upsetting, heading and stamping.

2.2.8. Rolled steel grades 25, 30, 35, 40, 45, 50 with impact strength control on heat-treated (hardening + tempering) samples.
Impact strength standards must correspond to those indicated in the table. 4.

Table 4

2.2.9. Rolled products calibrated in a cold-worked or heat-treated state with standardized mechanical properties in accordance with the requirements specified in table. 5.

2.2.10. Rolled products with a macrostructure standardized in points in accordance with the requirements specified in table. 6.

2.2.11. Rolled products with standardized hardness in accordance with the requirements given in table. 7.

Table 5

Table 6

Note. For rolled products with a size of 70 mm or more with a surface quality of group B, subcortical bubbles of point 2 are allowed to a depth of no more than 1/2 of the tolerance for diameter or thickness.

Table 7

2.2.12. Rolled products with ultrasonic inspection of internal defects in accordance with GOST 21120.

2.2.13. Rolled products ensuring weldability.

2.2.14. Rolled steel grades 35, 40, 45, 50, 55, 58 (55pp), 60, intended for surface hardening with high frequency currents, with decarburization (ferrite + transition zone) no more. 1.5% diameter or thickness per side.

2.2.15. Rolled products with surface quality of group G with hot upsetting test.
Testing of rolled products of size St. The manufacturer may not carry out 80 mm, provided that satisfactory testing is ensured by the consumer.

2.3. Characteristics established by agreement between the consumer and the manufacturer

2.3.1. Rentals with reduced compared to those given in the table. 1 limits on the mass fraction of carbon, but not less than 0.05%.

2.3.2. Rentals with reduced compared to those given in the table. 1 limits on the mass fraction of carbon, but not less than 0.05%, without taking into account the permissible deviations in finished rolled products specified in table. 2.

2.3.3. Rolled products with a mass fraction of sulfur of 0.020-0.040%.

2.3.4. Rolled products with a mass fraction of sulfur not exceeding 0.025%.

2.3.5. Rolled products with a phosphorus mass fraction of no more than 0.030%.

2.3.6. Rolled products with a mass fraction of copper not exceeding 0.025%.

2.3.7. Long products with a diameter or thickness over 30 to 140 mm with removal of burrs and crumpled ends.

2.3.8. Cold-worked rolled products with increased HB by 15 compared to that given in the table. 7 hardness.

2.3.9. Rolled products with standardized mechanical properties, determined on samples cut from heat-treated blanks (hardening + tempering) of the size specified in the order, in accordance with the requirements of Table. 8.

Table 8

Notes:

1. Standards of mechanical properties before 01/01/92 are not rejected; determination is required.

2. The mechanical properties of steel 30 apply to rolled products up to 63 mm in size.

3. The values ​​of mechanical properties are given for rolled products with a round section. For rectangular sections, ranges of equivalent diameters are given in Appendix 2.

2.3.10. Rolled products with normalized hardenability in accordance with Appendices 3 and 4.

2.3.11. Rolled steel grades 35, 40, 45, 50, 55, 58 (55pp), 60, intended for surface hardening with high frequency currents, with decarburization (ferrite + transition zone) of no more than 0.5% of the diameter or thickness per side.

2.3.12. Rolled products in pickled condition.

2.4. Allowed in technical conditions provide for additional or increased characteristics for specific products that are not provided for in this standard.

A list of additional characteristics is given in Appendix 5.

2.5. Marking and packaging of rolled products - in accordance with GOST 7566.

2.5.1. Packaging of calibrated rolled products - in accordance with GOST 1051, with special surface finishing - in accordance with GOST 14955.

2.5.2. The marking is applied directly to the product if the product is not subject to packaging, and on the label if the product is packaged in bundles, skeins and coils.

3. ACCEPTANCE RULES

3.1. Rolled products are accepted in batches consisting of steel of one heat, one size and one heat treatment mode (when manufactured in a heat-treated state).

By agreement between the manufacturer and the consumer, batches are formed from steel of the same grade of several heats of the same size.

Each batch is accompanied by a quality document in accordance with GOST 7566.

When deoxidizing agents other than silicon are used for semi-quenched steel, a corresponding indication is made in the quality document.

For rentals accepted with characteristics established by the consumer in accordance with paragraphs. 2.2 and 2.3, the quality document indicates the test results for the ordered indicators.

3.2. Rolled products are subjected to acceptance tests.

3.3. To check the quality, the following are selected from a batch of rolled products:

1) for chemical analysis - one sample from a melting ladle in accordance with GOST 7565. The manufacturer periodically controls residual copper, nickel, chromium, arsenic and nitrogen, at least once a quarter. When producing steel, taking into account the manganese equivalent, control of residual copper, nickel and chromium is carried out at each heat;

2) to control surface quality and dimensions - all rods, strips and coils;

3) to control the macrostructure by fracture or etching, to test for impact bending, to determine the depth of the decarburized layer - two rods, strips or coils;

4) to test hardness - 2% of rods, strips or coils, but not less than 3 pieces;

5) for tensile testing - one rod, strip or coil for control in a normalized state, two rods, two strips or two coils for control in a quenched and tempered state;

6) to determine hardenability - one rod, strip or coil from a ladle melt of steel of all grades that do not contain boron, and two rods, two strips or two coils from a ladle melt of steel grades containing boron;

7) to determine the grain size - one rod, strip or coil from a melting ladle;

8) for upsetting testing - three rods, strips or coils.

3.4. If unsatisfactory test results are obtained for at least one of the indicators, repeated tests are carried out in accordance with GOST 7566.

The results of repeated tests are applied to the entire batch.

4. TEST METHODS

4.1. Chemical analysis of steel is carried out according to GOST 22536.0-GOST 22536.9, GOST 22536.13, GOST 12359 or other methods that are not inferior in accuracy to standard ones. If disagreements arise, chemical analysis is carried out in accordance with GOST 22536.0-GOST 22536.9, GOST 22536.13, GOST 12359.

4.2. The quality of the surface is checked by inspection of the rolled product without the use of magnifying devices. If necessary, the surface is brightened or etched, and for rolled products with a special surface finish with a diameter of up to 3 mm inclusive, the inspection is carried out at a magnification of up to 10×. The depth of defects on the surface of the rolled product is determined by control cleaning or filing with a file.

4.3. Geometric dimensions and shape are determined using measuring instruments in accordance with GOST 26877, GOST 162, GOST 166, GOST 427, GOST 2216, GOST 3749, GOST 5378, GOST 6507, GOST 7502, or tools certified in accordance with GOST 8.001 or GOST 8.326.

4.4. Sampling from coils for all types of tests is carried out at a distance of at least 1.5 turns from the end of the roll.

4.5. From each rod, strip or coil selected for control, one sample is taken: for tensile and upset testing, to determine the grain size, hardenability and depth of the decarbonized layer;
for impact bending testing - one sample of each type;
to control the macrostructure - one template.

4.6. Sampling for slump tests - according to GOST 7564.

4.7. Sampling for testing mechanical properties is carried out according to GOST 7564 (option 1).

4.8. The hot upset test is carried out according to GOST 8817.

The samples are heated to a forging temperature of 850-1000°C and upset by 65% ​​relative to the original height. There should be no open cracks or sunsets on the deposited samples.

4.9. Brinell hardness is determined according to GOST 9012. The hardness of rolled products with a diameter or thickness of less than 5 mm is not determined.

4.10. The tensile test is carried out according to GOST 1497 on samples of five times the length with a diameter of 5 or 10 mm.

For rolled products with a diameter or thickness up to 25 mm inclusive, testing may be carried out on samples without mechanical treatment.

The impact strength test is carried out according to GOST 9454 on type 1 samples.

The direction of the sample axis is along the rolling direction.

4.11. Samples for tensile testing of rolled products in accordance with the requirements of Table. 3 is cut from normalized blanks with a diameter or square side of 25 mm. For rods with a diameter of less than 25 mm, normalization is carried out in the finished section of the rod (without cutting the workpiece).

Note. For rods larger than 120 mm, sampling for mechanical tests can be carried out from forged or re-rolled blanks with a cross-section of 90-100 mm.

4.12. Samples for tensile testing of rolled products in accordance with the requirements of Table. 8 is cut from heat-treated blanks to the size specified by the consumer.

4.13. Heat treatment modes for workpieces (samples) for testing mechanical properties are given in Appendices 6 and 7.

4.14. Inspection of the macrostructure for fractures or etched templates is carried out without the use of magnifying devices in accordance with GOST 10243.
It is allowed to use ultrasonic testing (UT) and other non-destructive testing methods, agreed upon in the prescribed manner.

4.15. The depth of the decarbonized layer is determined according to GOST 1763.

4.16. Hardenability is determined by the method of end hardening according to GOST 5657.

4.17. The grain size is determined according to GOST 5639.

4.18. On steel of one heat that has passed tests for macro-structure, hardenability and mechanical properties on large rolled sections, the manufacturer may not carry out the above tests when producing smaller rolled sections.

4.19. The manufacturer is allowed to use statistical and non-destructive testing methods according to a methodology agreed upon in the prescribed manner. In case of disagreement and during periodic checks of product quality, the control methods provided for in this standard are applied.

5. TRANSPORTATION AND STORAGE

5.1. Transportation and storage - in accordance with GOST 7566 with the following addition.

5.1.1. Products are transported by all types of transport in accordance with the rules for the transportation of goods in force for this type of transport. By railways transportation is carried out depending on the weight and overall dimensions in covered or open cars in accordance with GOST 22235. The weight of the cargo package should not exceed when mechanized loading into open vehicles 10000 kg, indoors - 1250 kg. Packaging means - according to GOST 7566.

When sending two or more packages, the dimensions of which make it possible to arrange a transport package with overall dimensions in accordance with GOST 24597, the packages must be formed into transport packages in accordance with GOST 21929. Fastening means are in accordance with GOST 21650.

APPENDIX 1
Mandatory

Examples of symbols

Hot-rolled round steel, 100 mm in diameter, normal rolling accuracy B according to GOST 2590-88, made of grade 30 steel, with group A surface quality, without heat treatment:

Rolled strip, 36 mm thick and 90 mm wide, normal accuracy, sickle shape class 2, non-flatness class 2 according to GOST 103-76, from steel grade 45, with surface quality group B, without heat treatment:

Calibrated round rolled products, 10 mm in diameter, with tolerance range h11 in accordance with GOST 7417-75, made of grade 45 steel, with group B surface quality in accordance with GOST 1051-73, cold-worked - N:

Calibrated square rolled products, with a square side of 15 mm, with a tolerance range of h11 in accordance with GOST 8559-75, from steel grade 20, with surface quality of group B in accordance with GOST 1051-73, cold-worked - N:

Calibrated hexagonal rolled products, inscribed circle diameter 8 mm, with tolerance range h11 in accordance with GOST 8560-78, made of grade 45 steel, with group B surface quality in accordance with GOST 1051-73, heat treated - T:

APPENDIX 2
Mandatory

Conversion of rectangular sections into round ones with the same mechanical properties

APPENDIX 3
Mandatory

HARDENABILITY STRIPS OF STRUCTURAL CARBON STEEL

Steel grade 35

Steel grade 40

Steel grade 45

APPENDIX 4
Mandatory

PARAMETERS OF BRAND STRIPS (LIMITS OF FLUCTUATIONS IN HARDNESS HRC (HRCе) AND HRB ACCORDING THE LENGTH OF THE END SAMPLE)

Table 9

RENTAL CHARACTERISTICS INSTALLED BY AGREEMENT OF THE CONSUMER WITH THE MANUFACTURER IN THE NTD

1. Rolled products with a normalized mass fraction of nitrogen in electric steel.

2. Rolled products with a lower mass fraction of manganese, reduced against the standards of Table. 1 by the value of manganese equivalent equal to: Em = 0.3 (Cr%) + 0.5 (Ni%) + 0.7 (Cu%), where Cr, Ni, Cu is the residual actual mass fraction of chromium, nickel, copper in steel, not exceeding the standards specified in table. 1.

3. Rolled products calibrated from steel grades 08, 55 and 60 in a cold-worked or heat-treated state with control of mechanical properties.

4. Rolled products with normalized impact strength on type I samples at a temperature of minus 40°C.

5. Rolled products with normalized impact strength on type II samples at a temperature of plus 20°C and sub-zero temperatures.

6. Rolled without control of relative contraction.

7. Rolled products calibrated and with a special surface finish with normalized hardness in a normalized and tempered state and hardened with a tempering state.

8. Long-rolled products with standardized hardness in a normalized state.

9. Rolled products with standardized hardness within specified limits.

10. Rolled products without hardness control.

11. Rolled products with a standardized austenite grain size.

12. Rolled products with standardized purity for non-metallic inclusions.

13. Rolled products with standardized cleanliness but with hairs revealed on the surface of finished parts by magnetic method or etching.

14. Rental of small-tonnage lots.

MODES

heat treatment of workpieces to control the mechanical properties given in table. 3 and 4

Table 10

MODES

heat treatment of workpieces to control the mechanical properties given in table. 8

Table 11

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the USSR Ministry of Ferrous Metallurgy

DEVELOPERS

V. T. Ababkov, Ph.D. tech. Sciences (topic leader); V. D. Khromov, Ph.D. tech. sciences; N. I. Elina

2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee on Standards dated November 24, 1988 No. 3811

3. INSTEAD GOST 1050-74

4. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS

B. METALS AND METAL PRODUCTS
Group B32

Change No. 1 GOST 1050-88 Long rolled products, calibrated, with special surface finishing, made of high-quality carbon structural steel. General technical conditions
Approved and put into effect by Resolution of the Committee for Standardization and Metrology of the USSR dated December 27, 1991 No. 2188

Date of introduction 01.05.92

Clause 1.1 Table 1 should be supplemented with note - 3: “3. The profile for oblique washers according to GOST 5157 is made of steel grades 20 and 35.”

Section 1 should be supplemented with clause - 1.1.8: “1.1.8. In accordance with the order, a residual mass fraction of nickel and chromium of no more than 0.40% each is allowed in quiet steel produced by the scrap process and the scrap ore process.”

Paragraphs 2.1.1-2.1.3 after the word “non-dimensional” should be supplemented with the designation: (ND);

Replace the word: “non-flatness” with “deviations from flatness”.

Clauses 2.1.2, 2.1.3. Replace the word: “quality” with “tolerance fields”.

Clause 2.1.4. Replace designations: N with NG; T for TO.

Clauses 2.1.5, 2.1.6. Replace the designation: a with 2GP.

Clauses 2.1.5, 2,1.7. Replace the designation: b with ZGP (3 times).

Clause 2.1.10 shall be stated in new edition: “2.1.10. The hardness (TB1) of long products without heat treatment should not exceed 255 HB, calibrated and with a special surface finish of cold-worked steel - 269 HB.”

Clause 2.1.11, after the word “rental”, add the words: “in a normalized state (M1)”.

Clause 2.2.3 after the word “measured” should be supplemented with the designation: (MD). Paragraph 2.2.4 should be supplemented with the designation: (КД).

Clause 2.2.5 shall be stated in a new wording: “2.2.5. Rolled products calibrated and with a special surface finish with a tolerance range of h12.”

Clause 2.2.6 should be supplemented with the words: “(annealed, highly tempered, normalized, normalized with tempering) - TO.”

Clause 2.2.7. Replace the designation: g with 1GP;

the first paragraph should be supplemented with the words: “and hot upset test (65)”;

add the paragraph: “Test of rolled products with the size of St. The manufacturer may not carry out 80 mm.”

Paragraph 2.2.8 after the word “viscosity” is supplemented with the designation: (KUV).

Clause 2.2.9 after the word “properties” is supplemented with the designation: (M2).

Clause 2.2.10 after the word “macrostructure” is supplemented with the designation: (KMS).

Clause 2.2.11 after the word “hardness” is supplemented with the designation: (ТВ2).

Clause 2.2.12 after the word “control” is supplemented with the designation: (UZK).

Paragraph 2.2.13 after the word “weldability” is supplemented with the designation: (ГС).

Clause 2.2.14 after the words “to the side” should be supplemented with the following symbol: (1C).

Clause 2.2.15 should be deleted.

Clause 2.3.6. Replace value: 0.025% with 0.25%.

Clause 2.3.7 after the word “burrs” should be supplemented with the designation: (UZ).

Clause 2.3.8 after the word “hardness” is supplemented with the designation: (TVZ).

Clause 2.3.9 after the word “properties” is supplemented with the designation: (МЗ).

table 8. Head. Replace the designation: KS with KU (3 times).

Paragraph 2.3.10 after the word “hardenability” is supplemented with the designation: (PR).

Clause 2.3.11 after the words “to the side” should be supplemented with the following designation: (2C).

Paragraph 2.3.12 after the word “etching” is supplemented with the designation: (T),

Section 2 should be supplemented with paragraphs - 2.3.13-2.3.17: “2.3.13. Rolled products calibrated with tolerance range h10.

2.3.14. Hot-rolled bars with increased (B) and high (A) dimensional accuracy.

2.3.15. Rolled products with surface quality group 2GP with hot upsetting test (65).

Testing of rolled products of size St. The manufacturer may not carry out 80 mm.

2.3.16. Rolled steel grades 45, 50, 50A with hardness control (TV4) on hardened samples in accordance with the requirements specified in table. 8a.

Table 8a

2.3.17. The mass fraction of nitrogen is not more than 0.008% in oxygen-converter steel for thin sheets.”

Clause 3.3. Listing 1. Replace the words: “for chemical analysis - one sample from a melt - ladle according to GOST 7565” with “for chemical analysis - samples according to GOST 7565”;

listing 5. Replace the words: “hardened and tempered” with “hardened, annealed, highly tempered or hardened and tempered”;

supplement with listing - 9: “9) To determine hardness after hardening - two longitudinal samples from melting.”

Clause 4.7 shall be stated in a new wording: “4.7. Sampling for testing mechanical properties according to table. 3 and 5 are carried out according to GOST 7564 (option 1), according to table. 4 and 8 - according to GOST 7564 (option 2).”

Section 4 should be supplemented with paragraph - 4.7a: “4.7a. Selection of samples to determine hardness after hardening is carried out according to the scheme given in Appendix 8.

Samples for control can be cut from finished rolled products or conversion billets (in heat control),”

Clause 4.8. The first paragraph should be stated in a new edition: “The recommended heating temperature for samples when testing for hot upsetting is 850-1000 °C. The heating temperature of the samples is indicated in the quality document.”

Section 4 should be supplemented with paragraphs - 4.9a: “4.9a. Rockwell hardness after quenching is determined according to GOST 9013 on a site located in the middle of the length of the sample. The surface of the hardness testing area is cleaned; in this case, the surface roughness Ra should be no more than 1.25 microns according to GOST 2789.”

Paragraph 4.13 should be supplemented with the words: “to control hardness after hardening - in Appendix 9.”

Clause 5.1.1. First paragraph. Delete the words: “according to GOST 22235”;

second paragraph. Delete the words: “according to GOST 21929”;

replace the words: “Packaging means - according to GOST 7666” with “Packaging, means and methods of forming packages - according to GOST 7666”,

Appendix 1 shall be presented in a new edition: supplemented with appendices - 8, 9.

APPENDIX 1
Mandatory

Examples of rental symbols
Diagram 1 of rental symbol

Cross-sectional view of rolled products - circle, square, hexagon, strip, profile Precision of rolled products Sickling Curvature, deviation from flatness Rental sizes Standard number for assortment Steel grade Surface quality group Mechanical properties Hardness GOST 1050—88 IN design documentation It is allowed to give examples of symbols in accordance with Scheme 2.

d Type of cross section of rolled products - circle, square, hexagon, strip, profile Precision of rolled products Sickling Curvature, deviation from flatness Rental sizes Standard number for assortment Condition of rolled products (heat-treated, cold-worked, without heat treatment) Additional requirements according to clauses 2.2 and 2.3 Hardness Mechanical properties Surface quality group Steel grade

(Continuation of changes to GOST 1050-88

Examples of symbols

Long-rolled products, round, of normal rolling accuracy (B), class II in curvature, of unmeasured length (ND), with a diameter of 100 mm according to GOST 2590-88, from steel grade 30, with surface quality of group 2GP, with mechanical properties according to table 3 (M1), with hardness according to clause 2.1.10 (TV1), with impact strength control according to table 4 (KUV), with deburring (US), with hot upset test (65), without heat treatment :

Circle B-II-ND-100 GOST 2590-88/30-2GP-M1-TV1-KUV-UZ-66 GOST 1050-88

Long-rolled products, square, with increased rolling precision (B), class I in curvature, cut length (MD), with a square side of 25 mm in accordance with GOST 2591-88, from steel grade 35, with surface quality of group 1GP, with mechanical properties according to the table . 8 (M3), with hardness according to table. 7 (TV2), with the macrostructure (MS) normalized in points according to table. 6, with decarburization according to clause 2.2.14 (1C), heat treated (HT):

Square B-I-MD-25 GOST 2591-88/35-1GP-M3-TV2-KMS-1S-TO GOST 1050-88

Rolled strip, normal rolling accuracy (B), sickle shape class 2, deviation from flatness class 2, multiple measured length (CD), thickness 36 mm, width 90 mm according to GOST 103-76, made of steel grade 45, with surface quality ZGP group, with mechanical properties according to table. 3 (M1), with hardness according to clause 2.1.10 (TV1), with normalized hardenability (HR), without heat treatment:

Strip V-2-2-KD-36×90 GOST 103-76/45-3GP-M1-TV1-PR GOST 1050-88

Hot-rolled profile for oblique washers, measured length (MD), with dimensions 2B×H×h = 32×5.8×4 mm according to GOST 5157-83, made of steel grade 35, with surface quality of the ZGP group, with mechanical properties according to table. 3 (M1), with hardness according to clause 2.1.10 (TB1), without heat treatment:

Profile for oblique washers MD-32×5.8×4 GOST 5157-83/35-3GP-M1-TV1 GOST 1050-88

Calibrated rolled products, round, with a tolerance range according to h11, cut length (MD), diameters 10 mm according to GOST 7417-75, made of grade 45 steel, with surface qualities of group B according to GOST 1051-73, with mechanical properties according to table. 5 (M2), with hardness according to clause 2.3.8 (TV3), with decarburization according to clause 2.3.11 (2C), cold-worked (NG):

Circle h11-M D-10 GOST 7417-75/45-V-M2-TV3-2S-NG GOST 1050-88

Calibrated rolled products, square, with a tolerance range of h11, a multiple of the measured length (CD), with a square side of 15 mm in accordance with GOST 8559-75, from steel grade 20, with surface quality of group B in accordance with GOST 1051-73, with mechanical properties in accordance with table 8 (M3), with hardness according to table. 7 (TV2), ensuring weldability (GS), cold-worked (NG):

Square h11-KD-15 GOST 8559-75/20-B-M3-TV2-GS-NG GOST 1050-88

Calibrated rolled products, hexagonal, with a tolerance range of h12, of unmeasured length (ND), with an inscribed circle diameter of 8 mm according to GOST 8560-78, made of grade 45 steel, with surface quality of group B according to GOST 1051-73, with mechanical properties according to table. 3 (M1), with hardness according to table. 8a (TV4), heat treated (TO):

Hexagon h 12-ND-8 GOST 8560 - 78/45-V-M1-TV4-TO GOST 1050 - 88

Rolled products with special surface finishing, round, with tolerance range h11, unmeasured length (ND), diameter 8 mm, with group B surface quality according to GOST 14955-77, made of grade 20 steel, with mechanical properties according to table. 5 (M2), with hardness according to table. 7 (TV3) cold-worked (NG):

Circle h 11-ND-8 GOST 14955 - 77/20-V-M2-TV3-NG GOST 1050 - 88

Examples of symbols that can be given in design documentation:

Rolled products with special surface finishing, round, with tolerance range h11, irregular length (ND), diameter 8 mm, surface quality group B according to GOST 14955-77, made of grade 20 steel, with mechanical properties according to table. 5 (M2), with hardness according to table. 7 (TV3), cold-worked (NG):

Legend

— cross section of the sample; sample length 55-60 mm, B - platform for hardness measurement.

Modes of thermal treatment of samples to determine hardness after hardening, given in table. 8a

Table 12

Notes:

1. Holding time during hardening (after reaching temperature, order) 20 min.
2. Oil temperature (65 ± 10) °C.”

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INTERSTATE STANDARD

ROLLED SOLID, CALIBRATED,
WITH SPECIAL FINISH
CARBON SURFACES
QUALITY CONSTRUCTION STEEL

GENERAL TECHNICAL CONDITIONS

Date of introduction 01/01/91

This standard establishes general technical conditions for hot-rolled and forged long products from high-quality carbon structural steel grades 08, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 58 (55pp) and 60 in diameter or thickness up to 250 mm, as well as rolled products calibrated and with special surface finishing of all brands.

In terms of chemical composition standards, the standard applies to other types of rolled products, ingots, forgings, stampings made of steel grades listed above, as well as steel grades 05kp, 08kp, 08ps, 10kp, 10ps, 11kp, 15kp, 15ps, 18kp, 20kp and 20ps .

1. MAIN PARAMETERS AND DIMENSIONS

1.1. The grades and chemical composition of steel according to the ladle sample must correspond to those given in table. 1.

Table 1

Notes:

1. According to the degree of deoxidation, steel is designated: boiling - kp, semi-calm - ps, calm - no index.

2. Steel grade 05kp is not allowed for use in newly created and modernized equipment.

1.1.1. The mass fraction of sulfur in steel should be no more than 0.040%, phosphorus - no more than 0.035%.

For steel grades 11kp and 18kp used for cladding, the mass fraction of sulfur should be no more than 0.035%, phosphorus - no more than 0.030%.

1.1.2. The residual mass fraction of nickel in steel of all grades should not exceed 0.30%, copper in steel grades 11kp and 18kp - 0.20%, in steel of other grades - 0.30%.

1.1.3. In steel grades 35, 40, 45, 50, 55 and 60, intended for the production of patented wire, the mass fraction of manganese should be from 0.30% to 0.60%, nickel - no more than 0.15%, chromium - no more 0.15%, copper - no more than 0.20%. The mass fraction of sulfur and phosphorus is in accordance with the requirements of the wire standards, but does not exceed the standards given in clause 1.1.1.

1.1.4. In steel grades 08ps, 10ps, 15ps and 20ps, intended for the production of rolled sheets for cold stamping, a mass fraction of manganese up to 0.25% is allowed at the lower limit.

1.1.5. In steel grades 08ps, 10ps, 15ps and 20ps, a mass fraction of silicon of less than 0.05% is allowed, provided that deoxidizers other than silicon are used in the required quantities.

1.1.6. In steel, the mass fraction of arsenic is allowed to be no more than 0.08%.

1.1.7. Mass fraction of nitrogen in oxygen-converter steel

1.1.7.1 For rolled products made from steel without extra-furnace treatment, the mass fraction of nitrogen should not exceed:

0.006% - for rolled sheets and strips;

0.008% - for other types of rental.

1.1.7.2 For rolled products made from steel with out-of-furnace processing, the mass fraction of nitrogen should not exceed 0.010%.

1.1.8. By agreement between the customer and the manufacturer, which is specified in the order, a residual mass fraction of chromium and nickel of no more than 0.40% each is allowed in smooth steel made using scrap metal.

1.2. In rolled products, billets, forgings and further processing products, deviations in chemical composition from the standards given in Table are allowed. 1, in accordance with table. 2.

Table 2

1.3. The range of rolled products must meet the requirements:

2. TECHNICAL REQUIREMENTS

2.1. Characteristics of the basic version

2.1.1. Rolled bars of unmeasured length (ND) with maximum deviations for normal dimensional accuracy, curvature, ovality and other requirements for shape, crescent shape and deviation from flatness, class 2 according to GOST 103 (for strip).

2.1.2. Calibrated rolled products of unmeasured length (ND) with maximum deviations for the tolerance field - h11, ovality - no more than maximum deviations in diameter.

2.1.3. Rolled products with special surface finishing of unmeasured (ND) length with maximum deviations for the tolerance field - h11, ovality - no more than half of the maximum deviations in diameter.

2.1.4. Long-rolled products without heat treatment, calibrated and with a special surface finish, hard-worked - NG or heat-treated (annealed, highly tempered, normalized, normalized with tempering, hardened with tempering) - TO.

2.1.5 Long rolled products of two surface quality groups: 2GP and 3GP. Rolled products of surface quality group 2GP are intended primarily for hot forming, while those of group 3GP are intended primarily for cold machining.

2.1.6. On the surface of rolled products of surface quality group 2GP there should be no rolled bubbles, rolling films, sunsets, cracks, contamination, or stress cracks.

2.1.1-2.1.6.(Changed version, Change No. 1).

2.1.6.1. Defects on the surface must be removed by flat cutting or grinding, the width of which must be at least five times the depth.

The depth of cleaning defects, based on the actual size, should not exceed:

half the amount of maximum deviations per size - for rolled products with a size of less than 80 mm;

sums of maximum deviations per size - for rolled products with sizes from 80 to 140 mm;

5% of diameter or thickness - for rolled products with sizes from 140 to 200 mm;

6% - diameter or thickness - for rolled products larger than 200 mm.

In one section of rolled products with a size (diameter or thickness) of more than 140 mm, no more than two strippings of maximum depth are allowed.

2.1.6.2. On the rolled surface, individual risks, dents and ripples with a depth within half the sum of the maximum deviations per size, as well as rolled bubbles and dirt (hairs) with a depth not exceeding 1/4 are allowed without cleaning. the amount of maximum deviations per size, but not more than 0.20 mm, based on the actual size.

2.1.7. On the surface of rolled products with surface quality of group 3GP, local defects with a depth not exceeding the minus maximum deviation per size for rolled products with a size of less than 100 mm are allowed; sums of maximum deviations per size - for rolled products measuring 100 mm or more.

The depth of defects is calculated from the nominal size.

2.1.8. Rolled products must be cut.

Crumpled ends and burrs are allowed.

The bevel of cutting long products up to 30 mm in size is not regulated, over 30 mm - it should not exceed 0.1 of the diameter or thickness. Rolled sections up to 40 mm of unmeasured length may be produced with uncut ends.

2.1.9. The surface quality and requirements for cutting the ends of calibrated rolled products must comply with GOST 1051 groups B and C, with special surface finishing - GOST 14955 groups B, D and D.

In rolled products with special surface finishing, decarburization is not allowed.

2.1.10. The hardness (TB1) of long products without heat treatment should not exceed 255 HB, calibrated and with a special surface finish of cold-worked steel - 269 HB.

2.1.11. The mechanical properties of rolled products in a normalized state (Ml) must comply with the standards given in table. 3.

Table 3

Notes:

1. Standards of mechanical properties given in table. 3, refer to rolled products with a diameter or thickness of up to 80 mm. For rolled products with a diameter or thickness over 80 mm, a reduction in relative elongation by 2% (abs.) and relative contraction by 5% (abs.) is allowed.

Standards of mechanical properties for workpieces forged from rods with a diameter or thickness of over 120 to 250 mm for rolled products with a diameter or thickness of 90 to 100 mm must correspond to those given in Table. 3.

2. By agreement between the manufacturer and the consumer, for steel grades 25-60, a reduction in tensile strength by 20 N/mm 2 (2 kgf/mm 2) is allowed in comparison with the standards specified in table. 3, while simultaneously increasing the elongation rates by 2% (abs.).

2.1.12. The macrostructure of rolled products should have shrinkage cavities, looseness, bubbles, delaminations, internal cracks, slag inclusions and flakes.

2.2. Customer specifications

2.2.1. Rolled steel grades 20, 25, 30, 35, 40, 45, 50 with a mass fraction of boron from 0.002% to 0.006%.

In this case, the letter P is placed at the end of the brand designation.

2.2.2. Rolled steel from mild steel with a mass fraction of silicon from 0.17% to 0.27%.

2.2.1, 2.2.2(Changed edition, Amendment No. 2).

2.2.3. Rolled cut-to-length (MD) lengths.

2.2.4. Rolled lengths that are a multiple of the measured length (KD).

2.2.5. Rolled products calibrated and with a special surface finish with a tolerance range of h12.

2.2.6. Long products in a heat-treated state (annealed, highly tempered, normalized, normalized with tempering) - TO.

2.2.7. Rolled products with surface quality of group 1GP - for rolled out bubbles and contaminants (hairs) and hot upset test (65).

Rolled products are intended primarily for hot upsetting, heading and stamping.

2.2.8. Rolled steel grades 25, 30, 35, 40, 45, 50 with impact strength control (IT) on heat-treated (hardening + tempering) samples.

Impact strength standards (U V) must correspond to those indicated in the table. 4.

Table 4

2.2.9. Rolled products calibrated in a cold-worked or heat-treated state with standardized mechanical properties (M2) in accordance with the requirements specified in table. 5.

Table 5

2.2.10. Rolled products with a macrostructure (MS) normalized in points in accordance with the requirements specified in table. 6.

Table 6

Note. For rolled products with a size of 70 mm or more with a surface quality of group 3GP, subcortical bubbles of point 2 are allowed to a depth of no more than 1/2, the sum of the maximum deviations for diameter or thickness.

2.2.11. Rolled products with standardized hardness (TB2) in accordance with the requirements given in table. 7.

Table 7

2.2.12. Rolled products with ultrasonic testing (UT) of internal defects in accordance with GOST 21120.

2.2.13. Rolled steel grades 08, 10, 15 and 20 ensuring weldability (GS).

For rolled steel of other grades, to ensure weldability, the customer specifies the carbon equivalent formula in the order or specifies the chemical composition of the steel.

2.2.14. Rolled steel grades 35, 40, 45, 50, 55, 58 (55pp), 60, intended for surface hardening with high frequency currents, with decarburization (ferrite + transition zone) no more than 1.5% of the diameter or thickness per side (1C ).

2.2.4 - 2.2.14 (Changed edition, Amendment No. 1).

2.2.15 Rolled steel grade 50 with a mass fraction of sulfur and phosphorus of no more than 0.025% each. In this case, the brand designation is 50A

2.3. Characteristics established by agreement between the consumer and the manufacturer

2.3.1. Rentals with reduced compared to those given in the table. 1 limits on the mass fraction of carbon, but not less than 0.05%.

2.3.2. Rentals with reduced compared to those given in the table. 1 limits on the mass fraction of carbon, but not less than 0.05%, without taking into account the permissible deviations in finished rolled products specified in table. 2.

2.3.3. Rolled products with a mass fraction of sulfur from 0.020% to 0.040%.

2.3.4. Rolled products with a mass fraction of sulfur not exceeding 0.025%.

2.3.5. Rolled products with a phosphorus mass fraction of no more than 0.030%.

2.3.6. Rolled products with a mass fraction of copper not exceeding 0.25%.

2.3.7. Long products with a diameter or thickness of over 30 to 140 mm with removal of burrs (UZ) and crumpled ends.

2.3.8. Cold-worked rolled products with HB increased by 15 compared to that given in the table. 7 hardness (TV3).

2.3.9. Rolled products with standardized mechanical properties (M3), determined on samples cut from heat-treated blanks (hardening + tempering) of the size specified in the order, in accordance with the requirements of Table. 8.

Table 8

Notes:

2. The mechanical properties of steel 30 apply to rolled products up to 63 mm in size.

3. The values ​​of mechanical properties are given for rolled products with a round section. For rectangular sections, ranges of equivalent diameters are given in Appendix 2.

2.3.10. Rolled products with normalized hardenability (HR) in accordance with Appendix 4.

2.3.9, 2.3.10(Changed edition,Change No. 2 ).

2.3.11. Rolled steel grades 35, 40, 45, 50, 55, 58 (55pp), 60, intended for surface hardening with high frequency currents, with decarburization (ferrite + transition zone) no more than 0.5% of the diameter or thickness per side (2C ).

2.3.12. Rolled products in etched (T) condition.

2.3.6 - 2.3.12.(Changed edition,Change No. 1 ).

2.3.13. Rolled products calibrated with tolerance range h10.

2.3.14. Hot-rolled bars with increased (B) and high (A) dimensional accuracy.

2.3.15. Rolled products with surface quality group 2GP with hot upsetting test (65).

Testing of rolled products of size St. The manufacturer may not carry out 80 mm.

2.3.16. Rolled steel grades 45, 50, 50A with hardness control (TV4) on hardened samples in accordance with the requirements specified in table. 8a.

Table 8a

2.3.17. The mass fraction of nitrogen is not more than 0.008% in oxygen-converter steel for thin sheets.

2.3.13 - 2.3.17. (Introduced additionally, Amendment No. 1).

2.4. It is allowed in the technical specifications for specific products to provide for additional or increased characteristics not provided for by this standard.

A list of additional characteristics is given in Appendix 5.

2.5. Marking and packaging of rolled products - in accordance with GOST 7566.

2.5.1. Packaging of calibrated rolled products - in accordance with GOST 1051, with special surface finishing - in accordance with GOST 14955.

2.5.2. The marking is applied directly to the product if the product is not subject to packaging, and on the label if the product is packaged in bundles, skeins and coils.

3. ACCEPTANCE RULES

3.1. Rolled products are accepted in batches consisting of steel of one heat, one size and one heat treatment mode (when manufactured in a heat-treated state).

By agreement between the manufacturer and the consumer, batches are formed from steel of the same grade of several heats of the same size.

Each batch is accompanied by a quality document in accordance with GOST 7566.

When deoxidizing agents other than silicon are used for semi-quenched steel, a corresponding indication is made in the quality document.

For rentals accepted with characteristics established by the consumer in accordance with paragraphs. 2.2 and 2.3, the quality document indicates the test results for the ordered indicators.

3.2. The rolled products are subjected to acceptance tests.

3.3. To check the quality, the following are selected from a batch of rolled products:

1) for chemical analysis - samples according to GOST 7565. The manufacturer carries out periodic monitoring of residual copper, nickel, chromium, arsenic and nitrogen at least once a quarter. When producing steel, taking into account the manganese equivalent, control of residual copper, nickel and chromium is carried out at each heat;

2) to control surface quality and dimensions - all rods, strips and coils;

3) to control the macrostructure by fracture or etching, to test for impact bending, to determine the depth of the decarburized layer - two rods, strips or coils;

4) to test hardness - 2% of rods, strips or coils, but not less than 3 pieces;

5) for tensile testing - one rod, strip or coil for control in a normalized state, two rods, two strips or two coils for control in a cold-worked, annealed, high-tempered or tempered state;

6) to determine hardenability - one rod, strip or coil from a melting ladle of steel of all grades that do not contain boron, and two rods, two strips or two coils from a melting ladle of steel grades containing boron;

7) to determine the grain size - one rod, strip or coil from a melting ladle;

8) for upset testing - three rods, strips or coils;

9) to determine hardness after hardening - two longitudinal samples from melting.

3.4. If unsatisfactory test results are obtained for at least one of the indicators, repeated tests are carried out in accordance with GOST 7566.

The results of repeated tests are applied to the entire batch.

4. TEST METHODS

4.1. Chemical analysis of steel is carried out according to GOST 22536.0 - GOST 22536.9, GOST 27809, GOST 12359 or other methods that are not inferior in accuracy to standard ones. If disagreements arise, chemical analysis is carried out in accordance with GOST 22536.0 - GOST 22536.9, GOST 27809, GOST 12359.

4.2. The quality of the surface is checked by inspection of the rolled product without the use of magnifying devices. If necessary, the surface is brightened or etched, and for rolled products with a special surface finish with a diameter of up to 3 mm inclusive, the inspection is carried out at a magnification of up to 10 ×. The depth of defects on the surface of the rolled product is determined by control cleaning or filing with a file.

4.3. Geometric dimensions and shape are determined using measuring instruments in accordance with GOST 26877, GOST 162, GOST 166, GOST 427, GOST 3749, GOST 5378, GOST 6507, GOST 7502, or instruments that have been verified or calibrated.

4.4. Sampling from coils for all types of tests is carried out at a distance of at least 1.5 turns from the end of the roll.

4.5. From each rod, strip or coil selected for control, one sample is taken: for tensile and upset testing, to determine the grain size, hardenability and depth of the decarbonized layer;

for impact bending testing - one sample of each type;

to control the macrostructure - one template.

4.6. Sampling for slump tests - according to GOST 7564.

4.7. Sampling for testing mechanical properties according to table. 3 and 5 are carried out according to GOST 7564 (option 1), according to table. 4 and 8 - according to GOST 7564 (option 2).

4.7a. Selection of samples to determine hardness after hardening is carried out according to the scheme given in Appendix 8.

Samples for control can be cut from finished rolled products or conversion billets (in heat control).

The samples are heated to a forging temperature of 850 ºС to 1000 ºС and are upset by 65% ​​relative to the original height. There should be no open cracks or sunsets on the deposited samples.

4.9. Brinell hardness is determined according to GOST 9012. The hardness of rolled products with a diameter or thickness of less than 5 mm is not determined.

4.9a. Rockwell hardness after quenching is determined according to GOST 9013 on a site located in the middle of the length of the sample. The surface of the site for measuring hardness is cleaned; while the surface roughness Ra should be no more than 1.25 microns according to GOST 2789.

4.10. The tensile test is carried out according to GOST 1497 on samples of five times the length with a diameter of 5 or 10 mm.

For rolled products with a diameter or thickness up to 25 mm inclusive, testing may be carried out on samples without mechanical treatment.

The impact bending test is carried out according to GOST 9454 on samples of type 1 or 11.

The direction of the sample axis is along the rolling direction.

4.11. To conduct tensile tests on rolled products in accordance with the requirements of Table. 3 samples for rolled products without heat treatment and for thermally treated rolled products (except for normalized ones) are cut from normalized blanks with a diameter (square side) of 25 mm. For rolled products with a size of less than 25 mm, normalization is carried out in the finished section, without cutting the workpiece.

Note - From bars larger than 120 mm, sampling for mechanical tests can be carried out from forged or re-rolled blanks with a section size of 90 - 100 mm.

For normalized rolled products, tensile testing is carried out on samples made from blanks with a diameter (square side) of 25 mm, selected from rolled products in the delivery state

4.12. for tensile tests, rolled products are cut from heat-treated blanks in accordance with the requirements of Table 8. The size of the workpiece is specified by the consumer. If the workpiece size is not included in the order, it is selected by the manufacturer and indicated in the quality document.

4.13. The heat treatment modes of workpieces (samples) for testing mechanical properties are given in Appendices 6 and 7, for hardness control after hardening - in Appendix 9.

4.14. Inspection of the macrostructure for fractures or etched templates is carried out without the use of magnifying devices in accordance with GOST 10243.

It is allowed to use ultrasonic testing (UT) and other non-destructive testing methods, agreed upon in the prescribed manner.

4.15. The depth of the decarbonized layer is determined according to GOST 1763.

4.16. Hardenability is determined by end hardening method according to GOST 5657.

4.17. The grain size is determined according to GOST 5639.

4.18. On steel of one heat that has passed tests for macrostructure, hardenability and mechanical properties on large rolled sections, the manufacturer may not carry out the above tests when producing smaller rolled sections.

4.19. The manufacturer is allowed to use statistical and non-destructive testing methods according to a methodology agreed upon in the prescribed manner. In case of disagreement and during periodic checks of product quality, the control methods provided for in this standard are applied.

5. TRANSPORTATION AND STORAGE

5.1. Transportation and storage - in accordance with GOST 7566 with the following addition.

5.1.1. Products are transported by all types of transport in accordance with the rules for the transportation of goods in force for this type of transport. By rail, transportation is carried out depending on the weight and overall dimensions in covered or open cars. The weight of the cargo package should not exceed 10,000 kg for mechanized loading in open vehicles, and 1,250 kg in covered vehicles. Packaging, means and methods for forming packages - in accordance with GOST 7566.

When sending two or more packages, the dimensions of which allow you to arrange a transport package with overall dimensions in accordance with GOST 24597, the packages must be formed into transport packages. Fastening means - according to GOST 21650.

APPENDIX 1
Mandatory

EXAMPLES OF RENTAL SYMBOLS

Diagram 1 of rental symbol

In the design documentation it is allowed to provide examples of symbols in accordance with Scheme 2.

Examples of symbols

Long-rolled products, round, of normal rolling hardness (B1), class II in curvature, of unmeasured length (ND), with a diameter of 100 mm according to GOST 2590, made of grade 30 steel, with surface quality of group 2GP, with mechanical properties according to table. 3 (M1), with hardness according to clause 2.1.10 (TV1), with impact strength control according to table. 4 (KUV), with deburring (US), with hot upset test (65), without heat treatment:

Long-rolled products, square, with increased rolling precision (B1), class I in curvature, cut length (MD), with a square side of 25 mm according to GOST 2591, made of steel grade 35, with surface quality of group 1GP, with mechanical properties according to table. 8 (M3), with hardness according to table. 7 (TV2), with the macrostructure (MS) normalized in points according to table. 6, with decarburization according to clause 2.2.14 (1C), heat treated (HT):

Strip rolling, normal rolling accuracy in thickness (VT1) and width (VSh1), regular crescent shape (BC), normal flatness (PN), multiple cut length (CD), general purpose(ON), thickness 36 mm, width 90 mm GOST 103, made of steel grade 45, with surface quality of the ZGP group, with mechanical properties according to table. 3 (Ml), with hardness according to clause 2.1.10 (TV1), with normalized hardenability (HR), without heat treatment:

Strip VT1-VSh1-VS-PN-KD-ON-36×90 GOST 103-2006 /45-3GP-M1-TV1-PR GOST 1050-88

Hot-rolled profile for oblique washers, cut-to-length (MD), with dimensions 2B´H´h=32´5.8´4 mm according to GOST 5157, made of steel grade 35, with surface quality group 3GP, with mechanical properties according to table. 3 (Ml), with hardness according to clause 2.1.10 (TB1), without heat treatment:

Profile for oblique washers MD-32´5.8´4 GOST 5157-83 /35-3GP-M1-TB1 GOST 1050-88

Calibrated rolled products, round, with a tolerance range according to h11, cut length (MD), with a diameter of 10 mm according to GOST 7417, made of grade 45 steel, with surface quality of group B according to GOST 1051, with mechanical properties according to table. 5 (M2), with hardness according to clause 2.3.8 (TV3), with decarburization according to clause 2.3.11 (2C), cold-worked (NG):

Calibrated, square rolled products, with a tolerance range of h11, a multiple of the measured length (CD), with a square side of 15 mm in accordance with GOST 8559, from steel grade 20, with surface quality of group B in accordance with GOST 1051, with mechanical properties according to table. 8 (M3), with hardness according to table. 7 (TV2), ensuring weldability (GS), cold-worked (NG):

Calibrated rolled products, hexagonal, with a tolerance range of h12, of unmeasured length (ND), with an inscribed circle diameter of 8 mm according to GOST 8560, made of steel grade 45, with surface quality of group B according to GOST 1051, with mechanical properties according to table. 3 (Ml), with hardness according to table. 8a (TV4), heat treated (TO):

Rolled products with special surface finishing, round, with tolerance range h11, unmeasured length (ND), diameter 8 mm, with group B surface quality according to GOST 14955, made of grade 20 steel, with mechanical properties according to table. 5 (M2), with hardness according to table. 7 (TVZ) cold-worked (NG):

Examples of symbols that can be given in design documentation:

Rolled products with special surface finishing, round, with tolerance range h11, unmeasured length (ND), diameter 8 mm, surface quality group B according to GOST 14955, made of grade 20 steel, with mechanical properties according to table. 5 (M2), with hardness according to table. 7 (TVZ), cold-worked (NG):

APPENDIX 1.(Changed edition, Amendment No. 1, Amendment , ).

APPENDIX 2
Mandatory

CONVERTING RECTANGULAR SECTIONS TO ROUND SECTIONS WITH THE SAME
AND THE SAME MECHANICAL PROPERTIES

APPENDIX 3(Deleted, Amendment No. 2).

APPLICATION4
Mandatory

PARAMETERS OF BRAND STRIPS (FLUCTUATION LIMITS
HARDNESSHRC and HRB BY END SAMPLE LENGTH)

Table 9

STATE STANDARDS

STEEL QUALITY
AND HIGH QUALITY

SOLID AND SHAPE ROLLED STRAIGHTS,
CALIBRATED STEEL

Part 1

GOST 1050-88

Moscow

IPC PUBLISHING HOUSE OF STANDARDS

STATE STANDARD OF THE USSR UNION

Date of introduction 01/01/91

This standard establishes general technical conditions for hot-rolled and forged long products from high-quality carbon structural steel grades 08, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 58 (55pp) and 60 in diameter or thickness up to 250 mm, as well as rolled products calibrated and with special surface finishing of all brands.

In terms of chemical composition standards, the standard applies to other types of rolled products, ingots, forgings, stampings made of steel grades listed above, as well as steel grades 05kp, 08kp, 08ps, 10kp, 10ps, 11kp, 15kp, 15ps, 18kp, 20kp and 20ps .

1. MAIN PARAMETERS AND DIMENSIONS

1.1. The grades and chemical composition of steel according to the ladle sample must correspond to those given in table. 1.

Table 1

Notes:

1. According to the degree of deoxidation, steel is designated: boiling - kp, semi-calm - ps, calm - no index.

2. Steel grade 05kp is not allowed for use in newly created and modernized equipment.

3. The profile for oblique washers according to GOST 5157 is made of steel grades 20 and 35.

1.1.1. The mass fraction of sulfur in steel should be no more than 0.040%, phosphorus - no more than 0.035%.

For steel grades 11kp and 18kp used for cladding, the mass fraction of sulfur should be no more than 0.035%, phosphorus - no more than 0.030%.

1.1.2. The residual mass fraction of nickel in steel of all grades should not exceed 0.30%, copper in steel grades 11kp and 18kp - 0.20%, in steel of other grades - 0.30%.

1.1.3. In steel grades 35, 40, 45, 50, 55 and 60, intended for the production of patented wire, the mass fraction of manganese should be 0.30–0.60%, nickel - no more than 0.15%, chromium - no more than 0. 15%, copper - no more than 0.20%. The mass fraction of sulfur and phosphorus is in accordance with the requirements of the wire standards, but does not exceed the standards given in clause 1.1.1.

1.1.4. In steel grades 08ps, 10ps, 15ps and 20ps, intended for the production of rolled sheets for cold stamping, a mass fraction of manganese up to 0.25% is allowed at the lower limit.

1.1.5. In steel grades 08ps, 10ps, 15ps and 20ps, a mass fraction of silicon of less than 0.05% is allowed, provided that deoxidizers other than silicon are used in the required quantities.

1.1.6. In steel, the mass fraction of arsenic is allowed to be no more than 0.08%.

1.1.7. The mass fraction of nitrogen in oxygen-converter steel should not exceed 0.006% for rolled sheets and strips and 0.008% for other types of rolled products.

1.1.8. In accordance with the order, a residual mass fraction of nickel and chromium of no more than 0.40% each is allowed in plain steel produced by the scrap process and the scrap ore process.

1.2. In rolled products, billets, forgings and products of further processing, deviations in chemical composition from the standards given in table are allowed. 1, in accordance with table. 2.

Table 2

1.3. The range of rolled products must meet the requirements:

GOST 2590 - for hot-rolled rounds;

GOST 2591 or other regulatory and technical documentation - for hot-rolled square;

GOST 1133 - for forged round and square;

GOST 2879 - for hot-rolled hexagonal;

GOST 103 - for hot-rolled strip;

GOST 4405 - for forged strip;

GOST 5157 - for profiles for oblique washers;

GOST 7417 - for calibrated round;

GOST 8559 - for calibrated square;

GOST 8560 - for calibrated hexagonal;

normative and technical documentation - for calibrated strip;

GOST 14955 - with special surface finishing.

Examples of symbols are given in Appendix 1.

2. TECHNICAL REQUIREMENTS

2.1. Characteristics of the basic version

2.1.1. Rolled bars of unmeasured length (ND) with maximum deviations for normal dimensional accuracy, curvature, ovality and other requirements for shape, crescent shape and deviation from flatness, class 2 according to GOST 103 (for strip).

2.1.2. Calibrated rolled products of unmeasured length (ND) with maximum deviations for the tolerance field - h11, ovality - no more than maximum deviations in diameter.

2.1.3. Rolled products with special surface finishing of unmeasured (ND) length with maximum deviations for the tolerance field - h11, ovality - no more than half of the maximum deviations in diameter.

2.1.4. Long-rolled products without heat treatment, calibrated and with a special surface finish, hard-worked - NG or heat-treated (annealed, highly tempered, normalized, normalized with tempering, hardened with tempering) - TO.

2.1.5 Long rolled products of two surface quality groups: 2GP and 3GP. Rolled products of the 2GP surface quality group are intended primarily for hot forming, while those of the 3GP group are primarily intended for cold machining.

2.1.6. On the surface of rolled products of surface quality group 2GP there should be no rolled bubbles, rolling films, sunsets, cracks, contamination, or stress cracks.

2.1.1–2.1.6. (Changed edition, Amendment No. 1).

2.1.6.1. Defects on the surface must be removed by flat cutting or grinding, the width of which must be at least five times the depth.

The depth of cleaning defects, based on the actual size, should not exceed:

half the size tolerance - for rolled products with a size of less than 80 mm;

size tolerance - for rolled products with sizes from 80 to 140 mm;

5% of diameter or thickness - for rolled products ranging in size from 140 to 200 mm;

6% - diameter or thickness - for rolled products larger than 200 mm.

In one section of rolled products with a size (diameter or thickness) of more than 140 mm, no more than two strippings of maximum depth are allowed.

2.1.6.2. Individual scratches, dents and ripples with a depth within half the size tolerance, as well as rolled bubbles and dirt (hairs) with a depth not exceeding 1/4 are allowed on the rolled surface without cleaning. tolerance on size, but not more than 0.20 mm, based on the actual size.

2.1.7. On the surface of rolled products with surface quality of group 3GP, local defects with a depth not exceeding the minus maximum deviation per size for rolled products with a size of less than 100 mm are allowed; size tolerance - for rolled products measuring 100 mm or more.

The depth of defects is calculated from the nominal size.

2.1.8. Rolled products must be cut.

Crumpled ends and burrs are allowed.

The bevel of cutting long products up to 30 mm in size is not regulated, over 30 mm - should not exceed 0.1 of the diameter or thickness. Rolled sections up to 40 mm of unmeasured length may be produced with uncut ends.

2.1.9. The surface quality and requirements for cutting the ends of calibrated rolled products must comply with GOST 1051 groups B and C, with special surface finishing - GOST 14955 groups B, D and D.

In rolled products with special surface finishing, decarburization is not allowed.

2.1.10. The hardness (TB1) of long products without heat treatment should not exceed 255 HB, calibrated and with a special surface finish of cold-worked steel - 269 HB.

2.1.11. The mechanical properties of rolled products in a normalized state (Ml) must comply with the standards given in table. 3.

Table 3

Notes:

1. Standards of mechanical properties given in table. 3, refer to rolled products with a diameter or thickness of up to 80 mm. For rolled products with a diameter or thickness over 80 mm, a reduction in relative elongation by 2% (abs.) and relative contraction by 5% (abs.) is allowed.

Standards of mechanical properties for workpieces forged from rods with a diameter or thickness of over 120 to 250 mm for rolled products with a diameter or thickness of 90 to 100 mm must correspond to those given in Table. 3.

2. By agreement between the manufacturer and the consumer, for steel grades 25–60, a reduction in tensile strength by 20 N/mm 2 (2 kgf/mm 2) is allowed in comparison with the standards specified in table. 3, while simultaneously increasing the elongation rates by 2% (abs.).

2.1.10; 2.1.11.(Changed edition, Amendment No. 1).

2.1.12. The macrostructure of rolled products should not have shrinkage cavities, looseness, bubbles, delaminations, internal cracks, slag inclusions and flakes.

2.2. Customer specifications

2.2.1. Rolled steel grades 20, 25, 30, 35, 40, 45, 50 with a mass fraction of boron of 0.002–0.006%.

In this case, the letter P is placed at the end of the brand designation.

2.2.2. Rolled steel from mild steel with a mass fraction of silicon of 0.17-0.27%.

2.2.3. Rolled cut-to-length (MD) lengths.

2.2.4. Rolled lengths that are a multiple of the measured length (KD).

2.2.5. Rolled products calibrated and with a special surface finish with a tolerance range of h12.

2.2.6. Long products in a heat-treated state (annealed, highly tempered, normalized, normalized with tempering) - TO.

2.2.7. Rolled products with surface quality of group 1GP - for rolled out bubbles and contaminants (hairs) and hot upset test (65).

Rolled products are intended primarily for hot upsetting, heading and stamping.

2.2.8. Rolled steel grades 25, 30, 35, 40, 45, 50 with impact strength control (IT) on heat-treated (hardening + tempering) samples.

Impact strength standards (U V) must correspond to those indicated in the table. 4.

Table 4

2.2.9. Rolled products calibrated in a cold-worked or heat-treated state with standardized mechanical properties (M2) in accordance with the requirements specified in table. 5.

2.2.10. Rolled products with a macrostructure (MS) normalized in points in accordance with the requirements specified in table. 6.

2.2.11. Rolled products with standardized hardness (TB2) in accordance with the requirements given in table. 7.

Table 5

Table 6

Note. For rolled products with a size of 70 mm or more with a surface quality of group B, subcortical bubbles of point 2 are allowed to a depth of no more than 1/2, the tolerance for diameter or thickness.

Table 7

2.2.12. Rolled products with ultrasonic testing (UT) of internal defects in accordance with GOST 21120.

2.2.13. Rolled products ensuring weldability (WS).

2.2.14. Rolled steel grades 35, 40, 45, 50, 55, 58 (55pp), 60, intended for surface hardening with high frequency currents, with decarburization (ferrite + transition zone) no more than 1.5% of the diameter or thickness per side (1C ).

2.2.4–2.2.14 (Changed edition, Amendment No. 1).

2.2.15. (Deleted, Amendment No. 1).

2.3. Characteristics established by agreement between the consumer and the manufacturer

2.3.1. Rentals with reduced compared to those given in the table. 1 limits on the mass fraction of carbon, but not less than 0.05%.

2.3.2. Rentals with reduced compared to those given in the table. 1 limits on the mass fraction of carbon, but not less than 0.05%, without taking into account the permissible deviations in finished rolled products specified in table. 2.

2.3.3. Rolled products with a mass fraction of sulfur of 0.020–0.040%.

2.3.4. Rolled products with a mass fraction of sulfur not exceeding 0.025%.

2.3.5. Rolled products with a phosphorus mass fraction of no more than 0.030%.

2.3.6. Rolled products with a mass fraction of copper not exceeding 0.25%.

2.3.7. Long products with a diameter or thickness of over 30 to 140 mm with removal of burrs (UZ) and crumpled ends.

2.3.8. Cold-worked rolled products with HB increased by 15 compared to that given in the table. 7 hardness (TVZ).

2.3.9. Rolled products with standardized mechanical properties (MP), determined on samples cut from heat-treated blanks (hardening + tempering) of the size specified in the order, in accordance with the requirements of Table. 8.

2.3.10. Rolled products with normalized hardenability (HR) in accordance with Appendices 3 and 4.

2.3.11. Rolled steel grades 35, 40, 45, 50, 55, 58 (55pp), 60, intended for surface hardening with high frequency currents, with decarburization (ferrite + transition zone) no more than 0.5% of the diameter or thickness per side (2C ).

2.3.12. Rolled products in etched (T) condition.

2.3.7–2.3.11. (Changed edition, Amendment No. 1).

2.3.13. Rolled products calibrated with tolerance range h10.

2.3.14. Hot-rolled bars with increased (B) and high (A) dimensional accuracy.

Table 8a

Table 8

Notes:

1. Standards of mechanical properties before 01/01/92 are not rejected; determination is required.

2. The mechanical properties of steel 30 apply to rolled products up to 63 mm in size.

3. The values ​​of mechanical properties are given for rolled products with a round section. For rectangular sections, ranges of equivalent diameters are given in Appendix 2.

2.3.15. Rolled products with surface quality group 2GP with hot upsetting test (65).

Testing of rolled products of size St. The manufacturer may not carry out 80 mm.

2.3.16. Rolled steel grades 45, 50, 50A with hardness control (TV4) on hardened samples in accordance with the requirements specified in table. 8a.

2.3.17. The mass fraction of nitrogen is not more than 0.008% in oxygen-converter steel for thin sheets.

2.3.13–2.3.17. (Introduced additionally, Amendment No. 1).

2.4. It is allowed in the technical specifications for specific products to provide for additional or increased characteristics not provided for by this standard.

A list of additional characteristics is given in Appendix 5.

2.5. Labeling and packaging of rentals - according to.

2.5.1. Packaging of calibrated rolled products - according to, with special surface finishing - in accordance with GOST 14955.

2.5.2. The marking is applied directly to the product if the product is not subject to packaging, and on the label if the product is packaged in bundles, skeins and coils.

3. ACCEPTANCE RULES

3.1. Rolled products are accepted in batches consisting of steel of one heat, one size and one heat treatment mode (when manufactured in a heat-treated state).

By agreement between the manufacturer and the consumer, batches are formed from steel of the same grade of several heats of the same size.

Each batch is accompanied by a quality document.

When deoxidizing agents other than silicon are used for semi-quenched steel, a corresponding indication is made in the quality document.

For rentals accepted with characteristics established by the consumer in accordance with paragraphs. 2.2 and 2.3, the quality document indicates the test results for the ordered indicators.

3.2. Rolled products are subjected to acceptance tests.

3.3. To check the quality, the following are selected from a batch of rolled products:

1) for chemical analysis - samples in accordance with GOST 7565. The manufacturer carries out periodic monitoring of residual copper, nickel, chromium, arsenic and nitrogen at least once a quarter. When producing steel, taking into account the manganese equivalent, control of residual copper, nickel and chromium is carried out at each heat;

2) to control surface quality and dimensions - all rods, strips and coils;

3) to control the macrostructure by fracture or etching, to test for impact bending, to determine the depth of the decarburized layer - two rods, strips or coils;

4) to test hardness - 2% of rods, strips or coils, but not less than 3 pieces;

5) for tensile testing - one rod, strip or coil for control in a normalized state, two rods, two strips or two coils for control in a cold-worked, annealed, high-tempered or tempered state;

6) to determine hardenability - one rod, strip or coil from a melting ladle of steel of all grades that do not contain boron, and two rods, two strips or two coils from a melting ladle of steel grades containing boron;

7) to determine the grain size - one rod, strip or coil from a melting ladle;

8) for upset testing - three rods, strips or coils;

9) to determine hardness after hardening - two longitudinal samples from melting.

(Changed edition, Amendment No. 1).

3.4. If unsatisfactory test results are obtained for at least one of the indicators, repeated tests are carried out according to.

The results of repeated tests are applied to the entire batch.

4. TEST METHODS

4.1. Chemical analysis of steel is carried out according to GOST 22536.0 -, GOST 27809, GOST 12359 or other methods that are not inferior in accuracy to standard ones. If disagreements arise, chemical analysis is carried out according to -, GOST 27809, GOST 12359.

4.2. The quality of the surface is checked by inspection of the rolled product without the use of magnifying devices. If necessary, the surface is brightened or etched, and for rolled products with a special surface finish with a diameter of up to 3 mm inclusive, the inspection is carried out at a magnification of up to 10 x. The depth of defects on the surface of the rolled product is determined by control cleaning or filing with a file.

4.3. Geometric dimensions and shape are determined using measuring instruments according to GOST 162, GOST 166, GOST 427, GOST 3749, GOST 5378, GOST 6507, GOST 7502, or tools certified according to GOST 8.001 or GOST 8.326.

4.4. Sampling from coils for all types of tests is carried out at a distance of at least 1.5 turns from the end of the roll.

4.5. From each rod, strip or coil selected for control, one sample is taken: for tensile and upset testing, to determine the grain size, hardenability and depth of the decarbonized layer;

for impact bending testing - one sample of each type;

to control the macrostructure - one template.

4.6. Sampling for settlement tests - according to.

4.7. Sampling for testing mechanical properties according to table. 3 and 5 are carried out according to GOST 7564 (option 1), according to table. 4 and 8 - according to GOST 7564 (option 2).

(Changed edition, Amendment No. 1).

4.7a. Selection of samples to determine hardness after hardening is carried out according to the scheme given in Appendix 8.

Samples for control can be cut from finished rolled products or conversion billets (in heat control).

(Introduced additionally, Amendment No. 1).

The samples are heated to a forging temperature of 850-1000°C and upset by 65% ​​relative to the original height. There should be no open cracks or sunsets on the deposited samples.

4.9. Brinell hardness is determined according to GOST 9012. The hardness of rolled products with a diameter or thickness of less than 5 mm is not determined.

4.9a. Rockwell hardness after quenching is determined according to GOST 9013 on a site located in the middle of the length of the sample. The surface of the hardness testing area is cleaned; in this case, the surface roughness Ra should be no more than 1.25 μm in .

(Introduced additionally, Amendment No. 1).

4.10. The tensile test is carried out according to GOST 1497 on samples of five times the length with a diameter of 5 or 10 mm.

For rolled products with a diameter or thickness up to 25 mm inclusive, testing may be carried out on samples without mechanical treatment.

The impact strength test is carried out according to GOST 9454 on type 1 samples.

The direction of the sample axis is along the rolling direction.

4.11. Samples for tensile testing of rolled products in accordance with the requirements of Table. 3 is cut from normalized blanks with a diameter or square side of 25 mm.

For rods with a diameter of less than 25 mm, normalization is carried out in the finished section of the rod (without cutting the workpiece).

Note. For rods larger than 120 mm, sampling for mechanical tests can be carried out from forged or re-rolled blanks with a cross-section of 90–100 mm.

4.12. Samples for tensile testing of rolled products in accordance with the requirements of Table. 8 is cut from heat-treated blanks to the size specified by the consumer.

4.13. The heat treatment modes of workpieces (samples) for testing mechanical properties are given in Appendices 6 and 7, for hardness control after hardening - in Appendix 9.

(Changed edition, Amendment No. 1).

4.14. Inspection of the macrostructure for fractures or etched templates is carried out without the use of magnifying devices in accordance with GOST 10243.

It is allowed to use ultrasonic testing (UT) and other non-destructive testing methods, agreed upon in the prescribed manner.

4.15. The depth of the decarbonized layer is determined according to GOST 1763.

4.16. Hardenability is determined by the method of end hardening according to GOST 5657.

4.17. The grain size is determined according to GOST 5639.

4.18. On steel of one heat that has passed tests for macrostructure, hardenability and mechanical properties on large rolled sections, the manufacturer may not carry out the above tests when producing smaller rolled sections.

4.19. The manufacturer is allowed to use statistical and non-destructive testing methods according to a methodology agreed upon in the prescribed manner. In case of disagreement and during periodic checks of product quality, the control methods provided for in this standard are applied.

5. TRANSPORTATION AND STORAGE

5.1. Transportation and storage - in accordance with GOST 7566 with the following addition.

5.1.1. Products are transported by all types of transport in accordance with the rules for the transportation of goods in force for this type of transport. By rail, transportation is carried out depending on the weight and overall dimensions in covered or open cars. The weight of the cargo package should not exceed 10,000 kg for mechanized loading in open vehicles, and 1,250 kg in covered vehicles. Packaging, means and methods for forming packages - according to.

When sending two or more packages, the dimensions of which make it possible to arrange a transport package with overall dimensions in accordance with GOST 24597, the packages must be formed into transport packages. Fastening means - according to GOST 21650.

APPENDIX 1
Mandatory

EXAMPLES OF RENTAL SYMBOLS

Scheme 1 symbol rental

In the design documentation it is allowed to provide examples of symbols in accordance with Scheme 2.

Examples of symbols

Long-rolled products, round, of normal rolling accuracy (B), class II in curvature, of unmeasured length (ND), with a diameter of 100 mm according to GOST 2590–88, from steel grade 30, with a surface quality of group 2GP, with mechanical properties according to table. 3 (M1), with hardness according to clause 2.1.10 (TV1), with impact strength control according to table. 4 (KUV), with deburring (US), with hot upset test (65), without heat treatment:

Circle B-II-ND-100 GOST 2590-88/30-2GP-M1-TV1-KUV-UZ-66 GOST 1050-88

Long-rolled products, square, with increased rolling accuracy (B), class I in curvature, cut length (MD), with a square side of 25 mm according to GOST 2591–88, from steel grade 35, with surface quality of group 1GP, with mechanical properties according to the table . 8 (MZ), with hardness according to table. 7 (TV2), with the macrostructure (MS) normalized in points according to table. 6, with decarburization according to clause 2.2.14 (1C), heat treated (HT):

Square B-I-MD-25 GOST 2591-88/35-1GP-MZ-TV2-KMS-1S-TO GOST 1050-88

Rolled strip, normal rolling accuracy (B), sickle shape class 2, deviation from flatness class 2, multiple cut length (CD), thickness 36 mm, width 90 mm according to GOST 103–76, from steel grade 45, with surface quality group 3GP , with mechanical properties according to table. 3 (Ml), with hardness according to clause 2.1.10 (TV1), with normalized hardenability (HR), without heat treatment:

Strip V-2-2-KD-36×90 GOST 103-76/45-3GP-M1-TV1-PR GOST 1050-88

Hot-rolled profile for oblique washers, cut-to-length (MD), with dimensions 2BxHxh=32×5.8×4 mm according to GOST 5157–83, made of steel grade 35, with surface quality group 3GP, with mechanical properties according to table. 3 (Ml), with hardness according to clause 2.1.10 (TB1), without heat treatment:

Profile for oblique washers MD-32×5.8×4 GOST 5157-83/35-3GP-M1-TB1 GOST 1050-88

Calibrated rolled products, round, with a tolerance range according to h11, cut length (MD), with a diameter of 10 mm according to GOST 7417–75, made of steel grade 45, with surface quality of group B according to GOST 1051–73, with mechanical properties according to table. 5 (M2), with hardness according to clause 2.3.8 (TVZ), with decarburization according to clause 2.3.11 (2C), cold-worked (NG):

Circle h11-MD-10 GOST 7417-75/45-V-M2-TVZ-2S-NG GOST 1050-88

Calibrated, square rolled products, with a tolerance range of h11, a multiple of the measured length (CD), with a square side of 15 mm in accordance with GOST 8559–75, from steel grade 20, with surface quality of group B in accordance with GOST 1051–73, with mechanical properties according to table. 8 (MZ), with hardness according to table. 7 (TV2), ensuring weldability (GS), cold-worked (NG):

Squareh11-KD-15 GOST 8559-75/20-B-MZ-TV2-GS-NG GOST 1050-88

Calibrated rolled products, hexagonal, with a tolerance range of h12, of unmeasured length (ND), with an inscribed circle diameter of 8 mm according to GOST 8560–78, made of steel grade 45, with surface quality of group B according to GOST 1051–73, with mechanical properties according to table. 3 (Ml), with hardness according to table. 8a (TV4), heat treated (TO):

Hexagonh12-ND-8 GOST 8560-78/45-V-M1-TV4-TO GOST 1050–88

Rolled products with special surface finishing, round, with tolerance range h11, unmeasured length (ND), diameter 8 mm, with group B surface quality according to GOST 14955–77, made of grade 20 steel, with mechanical properties according to table. 5 (M2), with hardness according to table. 7 (TVZ) cold-worked (NG):

Circleh11-ND-8 GOST 14955-77/20-V-M2-TVZ-NG GOST 1050-88

Examples of symbols that can be given in design documentation:

Rolled products with special surface finishing, round, with tolerance range h11, unmeasured length (ND), diameter 8 mm, surface quality group B according to GOST 14955–77, made of grade 20 steel, with mechanical properties according to table. 5 (M2), with hardness according to table. 7 (TVZ), cold-worked (NG):

Circle .

(Changed edition, Amendment No. 1).

APPENDIX 2
Mandatory

CONVERSION OF RECTANGULAR SECTIONS TO ROUND SECTIONS WITH THE SAME MECHANICAL PROPERTIES

APPENDIX 3
Mandatory

HARDENABILITY STRIPS
STRUCTURAL CARBON STEEL

Steel grade 35

Steel grade 40

Steel grade 45

APPLICATION4
Mandatory

PARAMETERS OF BRAND STRIPS (LIMITS OF FLUCTUATIONS IN HARDNESS HRC (HRC 3) AND HRB ACCORDING THE LENGTH OF THE END SAMPLE)

Table 9

RENTAL CHARACTERISTICS INSTALLED BY AGREEMENT OF THE CONSUMER WITH THE MANUFACTURER IN THE NTD

1. Rolled products with a normalized mass fraction of nitrogen in electric steel.

2. Rolled products with a lower mass fraction of manganese, reduced against the standards of Table. 1 per manganese equivalent value equal to:

E m =0.3 (Cr%) + 0.5 (Ni%) + 0.7 (Cu%), where Cr, Ni, Cu is the residual actual mass fraction of chromium, nickel, copper in steel, not exceeding the norms, indicated in table. 1.

3. Rolled products calibrated from steel grades 08, 55 and 60 in a cold-worked or heat-treated state with control of mechanical properties.

4. Rolled products with normalized impact strength on type I samples at a temperature of minus 40 ºС.

5. Rolled products with normalized impact strength on type II samples at a temperature of plus 20°C and sub-zero temperatures.

6. Rolled without control of relative contraction.

7. Rolled products calibrated and with a special surface finish with normalized hardness in a normalized and tempered state and hardened with a tempering state.

8. Long-rolled products with standardized hardness in a normalized state.

9. Rolled products with standardized hardness within specified limits.

10. Rolled products without hardness control.

11. Rolled products with a standardized austenite grain size.

12. Rolled products with standardized purity for non-metallic inclusions.

13. Rolled products with standardized purity based on hair fibers identified on the surface of finished parts by the magnetic method or etching.

14. Rental of small-tonnage lots.

MODES
heat treatment of workpieces to control the mechanical properties given in table. 3 and 4

Table 10

when normalizing or hardening - 30 minutes;

when tempering 200 ºС - 2 hours;

when tempering 600 ºС - 1 hour.

The cooling medium during quenching is water.

MODES
heat treatment of workpieces to control the mechanical properties given in table. 8

Table 11

APPENDIX 8
Mandatory

Sampling scheme for determining hardness after hardening

A - for rolled diameter b- for rolled products with diameter

up to 25 mm over 25 mm

Legend

Cross section sample; sample length 55–60 mm.

B - platform for measuring hardness.

Modes of thermal treatment of samples to determine hardness after hardening, given in table. 8a

Table 12

Notes:

1. Holding time during hardening (after reaching the hardening temperature) 20 minutes.

2. Oil temperature (65±10) ºС.

Appendices 8, 9. (Introduced additionally, Rev. No. 1).

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the USSR Ministry of Metallurgy

DEVELOPERS

V. T. Ababkov, Ph.D. tech. Sciences (topic leader);

V. D. Khromov, Ph.D. tech. sciences; N. I. Elina

2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee on Standards dated November 24, 1988 No. 3811

3. INSTEAD GOST 1050-74

4. Verification period - 1997

5. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS