STEEL LOW ALLOY
VARIETY AND SHAPED

Specifications

Low-alloy steel bars and shapes
Specifications

GOST
19281-73

(New edition, Rev. No. 1).

Examples of symbols:

Hot-rolled steel, round, 150 mm in diameter, standard rolling accuracy B according to GOST 2590-71, grade 09G2, category 2:

Hot-rolled steel, square, with a square side of 50 mm, increased rolling accuracy B according to GOST 2591-71, grade 09G2, category 4:

Hot-rolled steel, I-beams, number 30 according to GOST 8239-72, grade 10G2S1, category 5:

Hot-rolled steel, channel with parallel flange edges (P) according to GOST 8240-72, grade 09G2, category 4:

Rolled angle steel unequal-shelf size 63´40´4 mm, normal rolling accuracy B according to GOST 8210-72, grade 09G2, category 4:

Hot-rolled strip steel, 10 mm thick and 22 mm wide, with crescent shape according to class 1, increased rolling accuracy A according to GOST 103-76, grade 09G2, category 4:

I-beam normal with parallel edges of the shelves, number 14B1 according to GOST 26020-83, brand 10G2S1, category 4:

(Introduced additionally, Amendment No. 1).

2. TECHNICAL REQUIREMENTS

2.1. Low-alloyed profiled steel is manufactured in accordance with the requirements of this standard according to the technological regulations approved in the prescribed manner.

(New edition, Rev. No. 1).

2.1a. The chemical composition of steel must comply with the standards specified in GOST 19282-73.

2.2. According to the state of the surface, the steel must comply with the requirements of GOST 535-79. The surface subgroup must be specified in the order.

2.3. Depending on the normalized mechanical properties, steel is manufactured according to the categories indicated in Table. 1. The steel category is specified in the order.

Table 1

2.2, 2.3.

2.4. Shaped profiles and profiled steel are produced without heat treatment or in a heat-treated state.

(New edition, Rev. No. 1).

2.5. The weldability of steel is ensured by its manufacturing technology and chemical composition. The use of steel for welded or non-welded structures is specified in the order.

(Revised edition, Rev. No. 1).

2.6. The mechanical properties of steel must comply with the requirements of Table. 2.

2.7. The value of impact strength after mechanical aging must be at least 29 J/cm 2 (3 kgf m/cm 2).

2.8. For channels with a flange thickness of 13.5 mm, beams - 11 mm and corner steel - 20 mm made of steel grades 09G2, 09G2S, 10G2S1, 10KhSND and 15KhSND of category 6, the impact strength is additionally determined on samples with a concentrator of the type V according to GOST 9454-78 at a temperature of minus 20 °C. At the request of the consumer, tests are carried out at a temperature of minus 40 °C. The requirements are optional until January 1, 1988.

2.7, 2.8. (New edition,Change No. 1).

2.9. For rolled products with a diameter or side of a square more than indicated in Table. 2 it is allowed to determine the mechanical properties on samples cut from blanks, rolled or forged into a circle or square. The norms of mechanical properties in this case must correspond to those indicated in Table. 2.

table 2

Table 2. (New edition,Change No. 1).

Notes:

1. (Deleted, Rev. No. 1).

2. Norms of impact strength at a temperature of minus 70 ° C apply to shaped profiles with a thickness of up to 11 mm inclusive.

3. The values ​​of impact strength at a temperature of minus 20 °C must not be lower than the standards established for a temperature of minus 40 °C. The values ​​of impact strength at a temperature of minus 50 °C and minus 60 °C must not be lower than the standards established for a temperature of minus 70 °C.

4. At the request of the consumer, the value of the upper limit of tensile strength should not exceed 690 MPa (70 kgf / mm 2) for grades 15G2SF, 15G2SFD, 10G2B, 10KhSND.

2.10. Rolled products must withstand a cold bending test on a mandrel with a diameter equal to two thicknesses at an angle of 180 ° C.

2.11. The standards for ultrasonic testing are established by agreement between the manufacturer and the consumer.

(Introduced additionally, Rev. No. 1).

3. ACCEPTANCE RULES

3.1. Steel is accepted in batches. For steel from continuous casting plants, the batch should consist of rolled products of the same brand, the same size in thickness with a difference in mass fraction: carbon - no more than 0.04%, manganese - no more than 0.15% (according to ladle analysis). The batch for steel from ingots, in addition, must consist of one melting ladle.

The mass of a batch of steel from continuous casting plants should not exceed 250 tons.

The batch must be accompanied by a quality document in accordance with GOST 7566-81 with additions:

impact strength values ​​for samples with a concentrator of the form V at a temperature of minus 20 or minus 40 °C;

results of testing by ultrasonic testing methods.

3.2. To check the quality of steel, two bars are selected from each batch.

3.2, 3.3. (New edition,Change No. 1).

3.3. Upon receipt of unsatisfactory test results for at least one of the indicators, it is repeated tests on a double sample selected according to GOST 7566-81, taken from the same batch.

The retest results apply to the entire lot.

(New edition, Rev. No. 1).

3.3a. The control of titanium, residual nitrogen, chromium, nickel, copper and arsenic is carried out by the manufacturer at the request of the consumer.

3.3b. Ultrasonic control is carried out at the request of the consumer. The sample size - as agreed between the manufacturer and the consumer.

3.3a, 3.3b. (Introduced additionally,Change No. 1).

4. TEST METHODS

4.1. Inspection of rolled products is carried out without the use of magnifying devices.

4.2. Sampling for chemical analysis is carried out according to GOST 7565-81, chemical analysis according to

(New edition, Rev. No. 1).

Notes:

1. At the request of the consumer, the content of titanium, residual nitrogen, chromium, nickel, copper and arsenic is monitored at least twice a year.

2. In steel smelted on the basis of Kerch ores, the determination of arsenic content is mandatory.

4.3. Sampling for mechanical testing is carried out in accordance with the requirements of GOST 7564-73.

From each bar selected for control, the following is taken:

for tensile testing - one sample each;

to determine the impact strength - two samples for each temperature;

for testing for cold bending - one sample each.

4.4. The tensile test is carried out according to GOST 1497-84.

4.3, 4.4. (Changed edition,Change No. 1).

4.5. Determination of impact strength is carried out on samples with a concentrator of species U and v. For shaped in strip steel with a thickness of 5 to 10 mm, impact strength is determined on samples of type 2 or 3, with a thickness of 10 mm or more on samples of type I or II according to GOST 9454-78.

The impact strength of shaped and strip steel with a thickness of 5 and 10 mm, rolled with a deviation of minus tolerance, is determined on samples with a thickness equal to the thickness of the rolled product.

(New edition, Rev. No. 1).

4.6. Impact strength after mechanical aging is determined in accordance with the requirement of GOST 7268-82. For steels of categories 13, 14 and 15, deformation can be carried out both in tension and in compression.

4.7. The cold bend test is carried out according to GOST 14019-80.

4.6, 4.7.(Changed edition,Change No. 1).

4.8. When the manufacturer uses statistical methods for monitoring mechanical properties in accordance with the normative and technical documentation approved in the prescribed manner, the control of mechanical properties provided for by this standard may not be carried out by the manufacturer. The manufacturer guarantees the conformity of the manufactured products with the requirements of this standard. In arbitration cases and during periodic product quality checks, the control methods provided for in this standard are applied.

(New edition, Rev. No. 2).

4.9. Methods for conducting ultrasonic testing - according to normative and technical documentation.

(New edition, Rev. No. 1).

5. Marking, packaging, transportation and storage

5.1. Marking, packaging, transportation and storage - in accordance with GOST 7566-81 with an addition.

5.2. Steel products are transported by rail on platforms and gondola cars. Type of shipment - carload.

Section 5. (New edition, Amendment No. 1).

STEEL LOW ALLOY
VARIETY AND SHAPED

Specifications

Low-alloy steel bars and shapes
Specifications

GOST
19281-73

By the Decree of the State Committee of Standards of the Council of Ministers of the USSR dated December 24, 1973 No. 2741, the deadline for the introduction was established

from 01.01.75

Checked in 1979 Expiration date extended

until 01.07.85

Non-compliance with the standard is punishable by law

This standard applies to shaped profiles, sectional (round, square and strip) steel used in construction and engineering for welded and non-welded metal structures and used in products, mainly without additional heat treatment.

1. Brands AND RANGE

1.1. Steel is produced in the following grades:

manganese - 09G2, 14G2;

manganese with copper - 09G2D;

silicon-manganese - 09G2S, 10G2S1;

silicon-manganese with copper - 09G2SD, 10G2S1D;

manganese-vanadium - 15GF, 15G2SF;

manganese-vanadium with copper - 15GFD, 15G2SFD;

manganese-niobium - 10G2B;

manganese-niobium with copper - 10G2BD;

chrome-silicon-nickel with copper - 10KhSND, 15KhSND;

chromium-nickel phosphorous with copper - 10HNDP.

1.2. The shape, dimensions and maximum deviations of steel must comply with the requirements of GOST 2590 -71, GOST 2591 -71, GOST 1133-71, GOST 8509 -72, GOST 8510 -72, GOST 8239 -72, GOST 8240 -72, GOST 103-76 and GOST 26020-83.

Examples of symbols:

Hot-rolled steel, round, 150 mm in diameter, standard rolling accuracy B according to GOST 2590-71, grade 09G2, category 2:

Hot-rolled steel, square, with a square side of 50 mm, increased rolling accuracy B according to GOST 2591-71, grade 09G2, category 4:

Hot-rolled steel, I-beams, number 30 according to GOST 8239-72, grade 10G2S1, category 5:

Hot-rolled steel, channel with parallel flange edges (P) according to GOST 8240-72, grade 09G2, category 4:

Rolled angle steel unequal-shelf size 63´40´4 mm, normal rolling accuracy B according to GOST 8210-72, grade 09G2, category 4:

Hot-rolled strip steel, 10 mm thick and 22 mm wide, with crescent shape according to class 1, increased rolling accuracy A according to GOST 103-76, grade 09G2, category 4:

I-beam normal with parallel edges of the shelves, number 14B1 according to GOST 26020-83, brand 10G2S1, category 4:

2. TECHNICAL REQUIREMENTS

2.1. Low-alloyed profiled steel is manufactured in accordance with the requirements of this standard according to the technological regulations approved in the prescribed manner.

2.1a. The chemical composition of steel must comply with the standards specified in GOST 19282-73.

2.2. According to the state of the surface, the steel must comply with the requirements of GOST 535-79. The surface subgroup must be specified in the order.

2.3. Depending on the normalized mechanical properties, steel is manufactured according to the categories indicated in Table. 1. The steel category is specified in the order.

Table 1

2.2, 2.3. (Revised edition, Rev. No. 1).

2.4. Shaped profiles and profiled steel are produced without heat treatment or in a heat-treated state.

2.5. The weldability of steel is ensured by its manufacturing technology and chemical composition. The use of steel for welded or non-welded structures is specified in the order.

2.6. The mechanical properties of steel must comply with the requirements of Table. 2.

2.7. The value of impact strength after mechanical aging must be at least 29 J/cm 2 (3 kgf m/cm 2).

2.8. For channels with a flange thickness of 13.5 mm, beams - 11 mm and corner steel - 20 mm made of steel grades 09G2, 09G2S, 10G2S1, 10KhSND and 15KhSND of category 6, the impact strength is additionally determined on samples with a concentrator of the type V according to GOST 9454-78 at a temperature of minus 20 °C. At the request of the consumer, tests are carried out at a temperature of minus 40 °C. The requirements are optional until January 1, 1988.

2.9. For rolled products with a diameter or side of a square more than indicated in Table. 2 it is allowed to determine the mechanical properties on samples cut from blanks, rolled or forged into a circle or square. The norms of mechanical properties in this case must correspond to those indicated in Table. 2.

table 2

Table 2. (New edition,Change No. 1).

Notes:

2. Norms of impact strength at a temperature of minus 70 ° C apply to shaped profiles with a thickness of up to 11 mm inclusive.

3. The values ​​of impact strength at a temperature of minus 20 °C must not be lower than the standards established for a temperature of minus 40 °C. The values ​​of impact strength at a temperature of minus 50 °C and minus 60 °C must not be lower than the standards established for a temperature of minus 70 °C.

4. At the request of the consumer, the value of the upper limit of tensile strength should not exceed 690 MPa (70 kgf / mm 2) for grades 15G2SF, 15G2SFD, 10G2B, 10KhSND.

2.10. Rolled products must withstand a cold bending test on a mandrel with a diameter equal to two thicknesses at an angle of 180 ° C.

2.11. The standards for ultrasonic testing are established by agreement between the manufacturer and the consumer.

3. ACCEPTANCE RULES

3.1. Steel is accepted in batches. For steel from continuous casting plants, the batch should consist of rolled products of the same brand, the same size in thickness with a difference in mass fraction: carbon - no more than 0.04%, manganese - no more than 0.15% (according to ladle analysis). The batch for steel from ingots, in addition, must consist of one melting ladle.

The mass of a batch of steel from continuous casting plants should not exceed 250 tons.

The batch must be accompanied by a quality document in accordance with GOST 7566-81 with additions:

impact strength values ​​for samples with a concentrator of the form V at a temperature of minus 20 or minus 40 °C;

results of testing by ultrasonic testing methods.

3.2. To check the quality of steel, two bars are selected from each batch.

3.3. Upon receipt of unsatisfactory test results for at least one of the indicators, it is repeated tests on a double sample selected according to GOST 7566-81, taken from the same batch.

The retest results apply to the entire lot.

(New edition, -80,

for tensile testing - one sample each;

to determine the impact strength - two samples for each temperature;

for testing for cold bending - one sample each.

4.4. The tensile test is carried out according to GOST 1497-84.

4.3, 4.4. (Changed edition,Change No. 1).

4.5. Determination of impact strength is carried out on samples with a concentrator of species U and v. For shaped in strip steel with a thickness of 5 to 10 mm, impact strength is determined on samples of type 2 or 3, with a thickness of 10 mm or more on samples of type I or II according to GOST 9454-78.

The impact strength of shaped and strip steel with a thickness of 5 and 10 mm, rolled with a deviation of minus tolerance, is determined on samples with a thickness equal to the thickness of the rolled product.

4.6. Impact strength after mechanical aging is determined in accordance with the requirement of GOST 7268-82. For steels of categories 13, 14 and 15, deformation can be carried out both in tension and in compression.

4.7. The cold bend test is carried out according to GOST 14019-80.

4.6, 4.7.(Changed edition,Change No. 1).

4.8. When the manufacturer uses statistical methods for monitoring mechanical properties in accordance with the normative and technical documentation approved in the prescribed manner, the control of mechanical properties provided for by this standard may not be carried out by the manufacturer. The manufacturer guarantees the conformity of the manufactured products with the requirements of this standard. In arbitration cases and during periodic product quality checks, the control methods provided for in this standard are applied.

4.9. Methods for conducting ultrasonic testing - according to normative and technical documentation.

5. Marking, packaging, transportation and storage

5.1. Marking, packaging, transportation and storage - in accordance with GOST 7566-81 with an addition.

5.2. Steel products are transported by rail on platforms and gondola cars. Type of shipment - carload.