GOST 8479-70

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  ГОСТ 8479-70

GOST 8479−70 Forged structural carbon and alloyed steel. General specifications (with Amendments No. 1, 2, 3)

GOST 8479−70

Group B03

STATE STANDARD OF THE USSR

FORGINGS OF STRUCTURAL CARBON
AND ALLOY STEEL

General specifications

Structural carbon and alloyed steel forgings.
General specifications

OKP 41 2100

Date of introduction 1971−01−01

APPROVED AND put INTO EFFECT by decision of the Committee of standards, measures and measuring devices under Council of Ministers of the USSR of 15 January 1970 No. 59

Resolution of the state standard from 23.06.86 No. 1671 validity period extended till 01.01.92*
_________________
* Expiration removed by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS, No. 5/6, 1993). — Note the CODE.

REPLACE GOST 8479−57

The re-release (Oct 1988) with Amendments No. 1, 2, 3, approved in March 1977, December 1982, Post. 5874 31.12.81, June 1986 (IUS 5−77, 3−82, 9−86).


This standard applies to forgings for General purpose diameter (thickness) up to 800 mm of structural carbon, low alloy and alloyed steel manufactured by forging and hot stamping.

The standard establishes the group of forgings and the main technical requirements for acceptance and delivery them.

The standard does not replace existing standards and technical conditions for separate types of forgings, which meet specific requirements regarding production method, the surface quality, the use of special heat treatments, etc.

1. TECHNICAL REQUIREMENTS

1.1. Forgings shall be manufactured in accordance with the requirements of this standard according to the drawings approved in the prescribed manner, and normative-technical documentation for specific products. Forging the types of tests are divided into the groups listed in the table. 1.

(Changed edition, Rev. No. 3).

1.2. The classification of forgings to one group or another is made by the consumer, the group number specified in the specifications on the detail drawing.

1.3. At the request of the consumer, the delivery of the forgings should be performed with additional types of tests not provided for this standard (check for flocs, the trial by Bauman, ultrasound and periscope control, determination of residual stresses, yield strength at operating temperatures, the determination of fracture toughness at operating temperatures and negative, macro — and microanalysis of structure steel, alloy bends, determination of grain size, etc.). In this case, the forgings also belong to one of the groups: II, III, IV and V in accordance with table. 1.

The type, scope, rules and methods for additional testing are indicated in the drawing, forging or order.

Note. A group of quality forgings for ultrasonic control is adjusted in accordance with GOST 24507−80.

(Changed edition, Rev. No. 1, 3).

Table 1

Group of forgings	Types of tests	The conditions of acquisition of party	Acceptance features
I	Without testing	Forgings of different steel grades	-
II	Hardness	Forgings of one steel grade, together the last heat treatment	Hardness
III	Hardness	Forgings of one steel grade, the last heat treatment according to the same mode	The same
IV	1. Tensile test 2. The definition of toughness 3. Hardness	Forgings of one steel melting together the last heat treatment	Yield strength The relative narrowing Toughness
			-
V	1. Tensile test 2. The definition of toughness 3. Hardness	Taken individually, each forging	Yield strength The relative narrowing Toughness
			-

Notes:

1. Excluded.

2. Forgings, together undergone heat treatment in continuous furnaces, forging are sequentially loaded into the oven without breaking.

3. The consumer has the right to assign additional combinations the acceptance characteristics for the forgings of IV and V groups, instead of my selections above table. 1.

4. Allowed determination of hardness of forgings of group V to produce the samples for mechanical testing.

(Changed edition, Rev. No. 1, 2).

1.4. (Deleted, Rev. No. 2).

1.5. The starting material for the manufacture of forgings can serve as bars, crimped blanks (blooms), forged or rolled blanks and billets from continuous casting of steel (continuous caster) and various types of rolled products.

1.6. Forgings made of carbon, low alloy and alloy steel, the chemical composition shall conform to the requirements of GOST 380−88, GOST 1050−74,GOST 19281−73, GOST 4543−71 and other applicable standards or technical conditions.

Recommended steel grades depending on the diameter (thickness) of forgings and demand category strength after the final heat treatment is given in the Appendix.

(Changed edition, Rev. No. 1).

1.7. The dimensions of the forgings must consider the machining allowances, tolerances on dimensions and technological overlaps for forgings manufactured by press forging according to GOST 7062−79 manufactured forging hammers according to GOST 7829−70 and manufactured by hot-stamping according to GOST 7505−74 and overlaps on the samples for control tests.

Allowed for forgings weighing over 100 tons, manufactured by press forging, allowances and overlaps in the set of normative-technical documentation on a specific forging.

(Changed edition, Rev. No. 2).

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

1.9. Mechanical properties of forgings delivered after final heat treatment, are divided into three categories of strength. Categories of strength, the corresponding norms of mechanical properties determined by testing on longitudinal samples and standards of hardness are given in table. 2.

Norms of hardness for forgings, II and III groups and categories of strength for forgings of IV and V groups are established by agreement between manufacturer and consumer. Steel grade is set by agreement between manufacturer and consumer and is indicated on the detail drawing and forging.

At the customer’s request tensile strength must be higher than given in table. 2 for a given category strength:

120 MPa (12 kgf/mm) when required less than 600 MPa (60 kgf/mm),

150 MPa (15 kgf/mm) when required 600−900 MPa (60−90 kgf/mm),

200 MPa (20 kgf/mm) when required , more than 900 MPa (90 kgf/mm).

(Changed edition, Rev. No. 2).

Table 2

	Mechanical properties, not less
Kate- goriya so on- ness	Pre- Affairs current honor	Time men- ing company of Tule- nie	Elongation , %				The relative narrowing , %				The impact strength KCU, J/mx 10 (kgf · m/cm)				Brinell hardness number (on the surface of the forgings)
			The diameter (thickness) forged products of solid section
	MPa (kgf/mm)		up to 100	over 100 up to 300	over 300 up to 500	over 500 to 800	up to 100	over 100 up to 300	over 300 up to 500	over 500 to 800	up to 100	over 100 up to 300	over 300 up to 500	over 500 to 800	The number of hard dosti NV	, mm
KP 175 (18)	175	355 (36)	28	24	22	20	55	50	45	40	64 (6,5)	59 (6,0)	54 (5,5)	49 (5,0)	101- 143	5,85- 5,00
KP 195 (20)	195	390 (40)	26	23	20	18	55	50	45	38	59 (6,0)	54 (5,5)	49 (5,0)	44 (4,5)	111- 156	5,60- 4,80
KP 215 (22)	215	430 (44)	24	20	18	16	53	48	40	35	54 (5,5)	49 (5,0)	44 (4,5)	39 (4,0)	123- 167	5,35- 4,65
KP 245 (25)	245	470 (48)	22	19	17	15	48	42	35	30	49 (5,0)	39 (4,0)	34 (3,5)	34 (3,5)	143- 179	5,00- 4,50
KP 275 (28)	275	530 (54)	20	17	15	13	40	38	32	30	44 (4,5)	34 (3,5)	29 (3,0)	29 (3,0)	156- 197	4,80- 4,30
KP 315 (32)	315	570 (58)	17	14	12	11	38	35	30	30	39 (4,0)	34 (3,5)	29 (3,0)	29 (3,0)	167- 207	4,65- 4,20
KP 345 (35)	345	590 (60)	18	17	14	12	45	40	38	33	59 (6,0)	54 (5,5)	49 (5,0)	39 (4,0)	174- 217	4,55- 4,10
KP 395 (40)	395	615 (63)	17	15	13	11	45	40	35	30	59 (6,0)	54 (5,5)	49 (5,0)	39 (4,0)	187- 229	4,40- Of 4.00
KP 440 (45)	440	635 (65)	16	14	13	11	45	40	35	30	59 (6,0)	54 (5,5)	49 (5,0)	39 (4,0)	197- 235	4,30- 3,95
KP 490 (50)	490	655 (67)	16	13	12	11	45	40	35	30	59 (6,0)	54 (5,5)	49 (5,0)	39 (4,0)	212- 248	4,15- 3,85
KP 540 (55)	540	685 (70)	15	13	12	10	45	40	35	30	59 (6,0)	49 (5,0)	44 (4,5)	39 (4,0)	223- 262	4,05- 3,75
KP 590 (60)	590	735 (75)	14	13	12	10	45	40	35	30	59 (6,0)	49 (5,0)	44 (4,5)	39 (4,0)	235- 277	3,95- 3,65
KP 640 (65)	640	785 (80)	13	12	11	10	42	38	33	30	59 (6,0)	49 (5,0)	44 (4,5)	39 (4,0)	248- 293	A 3.85- 3,55
KP 685 (70)	685	835 (85)	13	12	11	10	42	38	33	30	59 (6,0)	49 (5,0)	39 (4,0)	39 (4,0)	262- 311	A 3.75- 3,45
KP 735 (75)	735	880 (90)	13	12	11	-	40	35	30	-	59 (6,0)	49 (5,0)	39 (4,0)	-	277- 321	3,65- 3,40
KP 785 (80)	785	930 (95)	12	11	10	-	40	35	30	-	59 (6,0)	49 (5,0)	39 (4,0)	-	293- 331	3,55- 3,35

Notes:

1. Strength is indicated by the letters KP and a number which indicates the yield strength.

2. (Deleted, Rev. No. 2).

3. By agreement between the manufacturer and the customer is allowed to determine the conditional yield strength () physical yield () in compliance with the rules for (a) specified in table. 2.

4. The thickness (diameter) of forging adopt its rated cross-section under heat treatment.

(Changed edition, Rev. No. 3).

1.10. By agreement with the consumer for the forgings of IV and V groups can be assigned higher plastic properties and impact toughness in comparison with specified in the table. 2. In this case, when category strength is additionally the letter S (special), and in the drawing, forgings recorded the required characteristics.

(Changed edition, Rev. No. 1, 2).

1.11. For determining the mechanical properties of forgings in the transverse, tangential or radial samples allowed a reduction in the rate of mechanical properties in comparison with given in table. 2 on the values shown in the table. 3.

Table 3

	The permissible reduction in the rate mechanical properties %
Mechanical properties			for tangential specimens
	for control samples	for radial samples	forgings with diameter up to 300 mm	forgings with a diameter of over 300 mm
Yield strength	10	10	5	5
Rupture strength	10	10	5	5
Elongation	50	35	25	30
The relative narrowing	40	35	20	25
Toughness	50	40	25	30

Note. For forging such as rings, manufactured by rolling, norms of mechanical properties obtained by testing the tangential samples are regulations for boundary samples.

1.12. Examples of symbols

Forging group I:

Gr. I GOST 8479−70.

Forgings group II (III) with hardness HB 143−179:

Gr. II (

III) HB 143−179 GOST 8479−70.

Forgings group IV (V) with yield strength of CP 490:

Gr. IV (

V) KP 49

0 GOST 8479−70;

forgings group IV category strength KP 490, relative narrowing of at least 50%, impact strength KCU not less than 69 j/mx 10(7 kgf/cm).

Gr. IV — KP 490С-50 — KCU69 GOST 8479−70.

Forgings group IV category strength KP 490, a temporary resistance of not less than 655 MPa, elongation not less than 14% and the impact strength KCU not less than 64 j/mx 10.

Gr. IV-KP 490-655-14 — KCU64 GOST 8479−70.

(Changed edition, Rev. No. 2).

1.13. On the surface of the forgings shall not be cracked, sekulow, captivity, Pisochyn.

On machined surfaces of forgings are allowed dents from scale and nicks, as well as a gentle felling or trimming defects provided that the depth of these defects does not extend beyond the smallest permitted sizes of forgings according to GOST 7062−79 or according to normative-technical documentation for forgings weighing over 100 tons

On the surfaces of the forgings being chasing, defects are not allowed.

On the machined surfaces of forgings are allowed separate defects without removal, if their depth is determined by controlling the cutting or Stripping, does not exceed 75% of the actual unilateral allowance for machining, forging, forging manufactured, and 50% for forgings manufactured by stamping.

(Changed edition, Rev. No. 2).

1.14. For forgings carbon and low carbon steel at a maximum depth of defects in excess of the actual unilateral allowance for machining allowed the removal of the defects of shallow cutting and subsequent welding.

Permitted the welding depth should be agreed with the consumer.

1.15. Forgings should not have placenow, cracks, shrinkage looseness, the absence of which is guaranteed by the manufacturer.

Forgings that are experiencing the above defects, are rejected, and all other forgings of the batch can be deemed fit only after the individual control.

1.14; 1.15. (Changed edition, Rev. No. 1).

1.16. The mode of heat treatment is set by the manufacturer.

Forgings shall be heat treated in draft form and (or) after pre-machining (roughing, reaming, etc.). Allowed by agreement between manufacturer and consumer forgings to machining only prior to heat treatment. Forging group I may be subjected to heat treatment.

(Changed edition, Rev. No. 1, 2).

1.17. Forgings, since the heat treatment edit in a cold or heated condition, must be subjected to release to relieve internal stresses.

Forgings groups I, II and III can be delivered without subsequent tempering with the guarantee of the manufacturer of required properties after editing.

1.18. By agreement of the parties forgings are cleaned from scale.

Cleaning method shall be specified in the drawing or by the terms of the order.

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

1.20. The mass of forgings, determined according to GOST 7062−79, shall not exceed the estimated mass determined by the largest size of the forgings (taking into account positive deviations for the outside dimensions and negative — for internal dimensions and cavities).

(Changed edition, Rev. No. 2, 3).

2. TEST METHODS

2.1. Parties are completed by the manufacturer of forgings made one drawing. The conditions of acquisition of party is given in table. 1.

Allowed to unite in parties of forgings made from the same steel grade in different drawings, similar configuration and size.

(Changed edition, Rev. No. 1).

2.2. Each forging shall be subjected to a visual inspection without the use of magnifying devices, if the terms of the order is not provided another method of control.

2.3. For each group of forgings, with the exception of group I, set the volume of required tests specified in table. 4.

Table 4

Group of forgings	Types of tests	The number of forgings from the party to be tested
I	Without testing	-
II	Hardness	5% of the party, but not less than 5 PCs.
III	Hardness	100%
IV	1. Tensile test 2. The definition of toughness	Up to 100 pieces — 2 pieces, over 100 pieces of 1%, but not less than 2 pieces (forgings with lower and upper limits of hardness)
	3. Hardness	100%
V	1. Tensile test 2. The definition of toughness 3. Hardness	100%

Notes:

1. The number of forgings group II to be tested, in agreement with the consumer can be increased.

2. For the forgings of IV group is allowed to make determination of mechanical properties for forgings not with the lower and upper limits of hardness, and hardness standards within defined categories of strength. In this case, the hardness is for more acceptance characteristics.

3. Allowed for forgings group IV, the determination of mechanical properties to produce a single forging when the number of forgings in the party for up to 20 PCs., if the difference in the prints on the hardness of the whole party does not exceed 0.30 mm for КП18-КП45 and 0.20 mm for КП50-КП80.

4. The volume control of forgings supplied after the preliminary heat treatment is indicated in the drawing forgings.

(Changed edition, Rev. No. 1, 2, 3).

2.4. Sampling for determination of chemical composition of metal forgings produced the churchyard 7565−81.

2.5. Chemical analysis of metal forgings produced according to GOST 22536.0−87 GOST 22536.1−77, GOST 22536.2−87, GOST 22536.3−77, GOST 22536.4−77, GOST 22536.5−87, GOST 22536.6−77,GOST 22536.7−77, GOST 22536.8−87, GOST 22536.9−77, GOST 22536.10−77, GOST 22536.11−87,GOST 22536.12−77, GOST 22536.13−77, GOST 12344−78, 12345−80 GOST, GOST 12346−78, 12347−77 GOST, GOST 12348−78, 12349−83 GOST, GOST 12350−78, GOST 12351−81, 12352−81 GOST, GOST 12353−78, 12354−81 GOST, GOST 12355−78, 12356−81 GOST, GOST 12357−84, 12358−82 GOST, GOST 12359−81, 12360−82 GOST, GOST 12361−82, 12362−79 GOST, GOST 12363−79,12364−84 GOST, GOST 12365−84, GOST 18895−81.

In the manufacture of forgings from metal, investment casting manufacturer, the chemical composition of steel is determined by plavonia analysis screener sample.

In the manufacture of forgings of steel ingots and steel grade and chemical composition are established by the document of quality of the manufacturer of the metal.

(Changed edition, Rev. No. 2).

2.6. Mechanical properties of forgings are determined for longitudinal, transverse, tangential or radial patterns. Kind of sample, if it is not specified in the drawing details, set by the manufacturer.

(Changed edition, Rev. No. 2).

2.7. Samples for determining the mechanical properties of forgings of the group V cut out of the lap left on each forging, and group IV — inlet for the sample or body forging, which is made incremental, the number of forgings.

Allowed samples for mechanical testing of forgings of the group IV cut from samples of the same or a larger cross-section, separately forged from metal of the same melting and similar treatment for forgings.

In this case, the sample must pass all the heating, including under forging or stamping, and simultaneously with the forgings of the batch heat treatment.

(Changed edition, Rev. No. 3).

2.8. The shape, size and location of the inlet for samples is determined by drawing forgings.

The size of the overlap on the sample should be sufficient to make all required samples.

In the manufacture of a single forging from ingot overlap on the sample must be from the profitable parts.

The forgings such as shafts and shells with a length of over 3 m, with appropriate reference to the drawing, forgings, slouchy fit to the sample must be provided at both ends.

2.9. The overlap on samples from forgings of alloy steel must be separated in a cold way, from forgings of carbon and low alloy steel, at the discretion of the manufacturer.

2.10. Samples for mechanical tests to be subjected to a further heat treatment or heating is not allowed.

2.11. In the manufacture of multiple parts from the same forging shown in one sample, the results of which is acceptance of all parts manufactured from the forging.

2.12. Samples for mechanical testing of forgings of cylindrical and prismatic shape is cut from the inlet or from the body of the forging so that its axis was at a distance of 1/3 of radius or 1/6 of the diagonal from the outer surface of the forging.

(Changed edition, Rev. No. 3).

2.13. When cutting samples from the reamed or hollow forgings with wall thickness up to 100 mm specimens cut so that its axis was at a distance of ½ of the wall thickness of the forging, and when the thickness is over 100 mm at a distance of 1/3 of the wall thickness of the forging from the outer surface.

In the manufacture of transverse or tangential specimens of the axis should pass the same distance as that for the longitudinal samples.

(Changed edition, Rev. No. 1, 3).

2.14. Place cuttings samples from forgings and represenational non-cylindrical shape in the absence of appropriate guidance on the detail drawing is set by the manufacturer.

2.15. Blanks for the samples can be taken from the forgings (not lap) by cutting core drill or cut, resulting machined forgings.

2.16. The number of samples for mechanical testing from each sample should be: one in tension, two in toughness.

2.17. Specimen preparation and tensile test are made according to GOST 1497−84 on samples five times the length with a calculated diameter of 10 mm.

Allowed to use the samples five times the length of the diameter calculated 6 or 5 mm.

2.18. Prototyping and test of toughness are produced according to GOST 9454−78 the samples of a type 1.

2.19. Brinell hardness number is determined according to GOST 9012−59.

If you cannot test on the device Brinell allowed to determine the hardness of other instruments that provide accuracy of ±10% of the number of hardness HB.

(Changed edition, Rev. No. 3).

2.20. If unsatisfactory results of mechanical tests at least one of the indicators for it are made of re-tests on twice the number of samples taken from the same batch of forgings.

If after re-testing received positive results, the whole batch of forgings is considered usable.

If after re-testing at least one of the samples is unsatisfactory, the batch of forgings is acceptable to be re-heat treated.

2.21. The number of reheat treatments should not be more than two.

Additional leave is not considered heat treatment and the number of holidays is not limited. After each heat treatment or additional vacation batch of forgings is tested as presented again.

The third heat treatment in the form of improvements allowed on large forgings in the cases when the normalization with the release does not provide the required mechanical properties.

2.20; 2.21. (Changed edition, Rev. No. 1).

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

2.23. For the final verification by the consumer of the quality of the workpieces and their compliance with the requirements of this standard shall apply the rules of sampling and test methods mentioned above.

3. THE MARKING, TRANSPORTATION, STORAGE

3.1. The place of labeling is indicated on the drawing forgings.

The marking must be clearly legible and contain the information specified in table. 5.

Table 5

	The markings
Group number	Stamp of technical control Department	The number of the detail drawing	Room melting or steel grade	Room forging
I	Specified	Specified	-	-
II	The same	The same	Specified	-
III	The same	The same	The same	-
IV	The same	The same	The same	-
V	The same	The same	The same	Specified

Note. The markings stamped forgings is established by agreement between manufacturer and consumer.

(Changed edition, Rev. No. 1).

3.2. For forgings weighing up to 10 kg are allowed the marking on the tag.

3.3. Each accepted technical control batch of forgings or forging is accompanied by a quality document, which States:

the name or trademark of the manufacturer;

order number;

the number of forgings in the party and their weight (group-V — the number of forgings);

the number of the drawing;

steel grade and designation of the standard or technical conditions;

chemical composition;

the room melt;

group of forgings;

strength for the IV and V groups or standards of hardness for forgings groups II and III and the designation of this standard;

a heat treatment process;

the results of the tests specified in this standard;

additional test data provided by the forging drawing or the terms of the order.

Note. The content of accompanying documents for forgings manufactured by die forging, is set by agreement between manufacturer and consumer.

3.2; 3.3. (Changed edition, Rev. No. 3).

3.4. Forgings should be stored in a dry warehouse.

Allowed storage of forgings under the canopy or on the bridges.

3.5. (Deleted, Rev. No. 2).

APPLICATION (recommended). Steel grades depending on the diameter (thickness) of forgings and the required category of durability

APP
Recommended

	The diameter (thickness) of forgings, mm
Categories of strength	Up to 100	From 100 to 300	From 300 to 500	From 500 to 800
КП175 (18)	15*, 20*, 25, St3*	St3*, 15*, 20*, 25*, ST5*	20*, 25*, 30*, ST5*	20*, ST5*, 30*, 35*
КП195 (20)	St3*, St3gsp*, 15*, 20*, 25*, 15X*, 20S*, 15HM*	St3*, СТ15ХМ*, 20*, 25*, 30*, ST5*, 15X*, 20S*, 12KH1MF*	ST5*, 25*, 30*, 35*, 20S*, 22K*	ST5*, 30*, 35*, 22K*
КП215 (22)	20*, 25*, 10G2*, 20S*, 15HM*, 12KH1MF*	20*, 25*, ST5*, 30*, 35*, 20S*, 15HM*, 10G2 with* 22K*, 16GS*, 12KH1MF*	30*, 35*, 40*, 10G2 WITH* 22K*, 12KH1MF*	30*, 35*, 40*, 22K*, 1ХГ2*, 12KH1MF*
КП245 (25)	25*, 30*, 35*, ST5*, 20S*, 12KHM*, 15HM*, 20ГС*	20, 30*, 35*, 40*, 45*, 20S, 12KHM*, 15HM*, 16GS*, 20ГС*, 12KH1MF*	30*, 35*, 40*, 45*, 40, 25ГС*, 35KHM*, 12KH1MF*	45*, 25ГС*, 40X*, 35KHM*
КП275 (28)	35*, 40*, 45*, 20S, 25ГС*, 15HM*	25, 35, 40*, 45*, 50*, 20S, 25ГС*, 12KHM*, 15HM*, 35G2*, 35KHM*, 34ХМ (34ХМА)	40, 45, 40*, 25ГС*, 15XM*, 35KHM*, 34ХМ (34ХМА)	40, 40S, 25ГСА, 15H1M1F
КП315 (32)	35, 45*, 50*, 40X*, 45KH*, 15HM*, 50Г2*, 35KHM*, 34ХМ (34ХМА)	40, 45, 40*, 55*, 50Г2*, 35KHM*, 40KHN*, 20X, 34ХМ (34ХМА)	45, 45KH*, 40H, 40KHN*, 38KHGN, 34ХН1М	40S, 45KH*, 45KH, 40KHN*, 38ГН*
КП345 (35)	40, 45, 15X, 40X*, 50Г2*, 45KH* 50X*, 15HM*, 35KHM*, 38KHGN*	45, 15KHM, 20X, 40X, 45KH* 50X*, 50Г2*	40S, 45KH*, 40KHN, 50S*, 38KHGN	45KH, 50S, 38KHGN, 35KHM, 15H1M1 °F, 34ХМ (34ХМА)
КП395 (40)	45, 30S, 40S, 50Г2*, 15KHM, 30KHMA, 40KHN, 30KHGS*, 34ХН1М*, 18HGT	35X, 40X, 45KH, 34ХМ, 35KHM, 40KHFA, 40KHN, 38KHGN, 15H1M1 °F, 34ХН1М*, 34ХМ (34ХМА)	40S, 45KH, 40KHN, 35KHM, 38KHGN, 40KHFA, 34ХМ (34ХМА)	40KHN, 35KHM, 38KHGN, 34ХМ (34ХМА)
КП440 (45)	40S, 35KHM, 40KHN, 38KHGN, 25KH1M1F*, 34ХН1М, 30KHMA, 15HM	40S, 45KH, 35KHM, 40KHN, 30KHMA, 35ХМА, 25KH1M1F*, 34ХН1М, 45ХНМ*, 34ХМ (34ХМА)	45KH, 35KHM, 40KHN, 34ХН1М, 38KHGN, 45ХНМ, 34ХМ (34ХМА)	40KHN, 34ХН1М, 45ХНМ*, 38KH2N2MA, 40KHN2MA
КП490 (50)	55, 55KH, 35X, 40X, 45KH, 15KHM, 35KHM, 30KHGSA, 30KHMA, 38KHM, 38KHGN, 40KHN, 25KH1MF	40S, 45KH, 35KHM, 40KHFA, 40KHN, 30KHGSA, 35HGSA, 38KHGN, 25Х2М1Ф*, 25KH1M1 °F, 20KH1M1F1TR, 34ХН1М, 30KHN2MFA, 45ХНМ*, 34ХМ (34ХМА)	34ХН1М, 30KHN2MFA, 40KHN2MA, 45ХНМ	34ХН1М, 40KHN2MA
КП540 (55)	38KHS, 40KHN, 40KHFA, 38KHGN, 34ХН1М, 25KH1M1 °F, 30KHGSA	45KH, 50S, 35ХН, 40KHN, 30ХНМА, 40KHFA, 35HGSA, 38KHGN, 34ХН1М, 40KHN2MA	34XH1M, 40XH2MA	45ХНМ
КП590 (60)	45KH, 38KHS, 38ХГ, 35HGSA, 35KHM, 40KHN, 45KHN, 38KHGN, 30KHN3A, 25KH1MF, 30KHGSA	50S, 34ХНМА, 40KHN, 25KH1M1 °F, 38H2MYUA, 35ХНМА, 30KHGSA, 34ХН1М, 20KH1M1F1TR, 25Х2М1Ф, 40KHN2MA, 34Х1МА, 45ХНМ	34ХН1М, 40Х2Н2МА, 45ХНМ	40KHN2MA, 45ХНМ
КП640 (65)	45KH, 50S, 45KHN, 30KHGSA, 35HGSA, 34ХН1М	34ХН1М, 40KHN2MA, 34ХН3М*	34ХН3М, 38KHN3MA, 40KHN2MA, 40Х2Н2МА	38KHN3MA, 38KHN3MFA, 34ХН3М, 35ХН1М2ФА, 36KH2N2MFA
КП685 (70)	30KHGT, 30KHGSA, 20KHN3A, 20KH1M1F1TR, 20KHN3A, 25Х2М1Ф*, 34ХН1М, 34ХН3М*	50KHFA, 25KH1M1 °F, 25Х2МФ1, 34ХН3М*, 34ХН1М, 38KHN3MA*, 38KHN3MFA*, 40KHN2MA	34ХН3М*, 38KHN3MA*, 38KHN3MFA*, 38ХН2МА, 18KH2N4MA, 45ХНМ	38KHN3MA, 38KHN3MFA, 34ХН3М, 36KH2N2MFA
КП735 (75)	34ХН1М, 40KHN2MA, 34ХН3М*, 40Х2Н2МА, 38KH2N2MA	34ХН3М*, 40KHN2MA, 38KHN3MA*, 38KHN3MFA*, 18KH2N4MA	34ХН3М, 38KHN3MA, 36KH2N2MFA	34ХН3М, 38KHN3MFA
КП785 (80)	18KH2N4VA, 38KHN3MFA*, 34ХН3МА*, 38KH2N2MA, 40KHN2MA	34ХН1МА, 34ХН3МА, 36KH2N2MFA, 38KHN3MFA, 40KHN2MA, 38Х2Н2М	34ХН3МА, 38KHN3MFA, 38KHN3MA, 36KH2N2MFA	-

Note. The sign «*" means that the steel is in the normalized condition; in other steel grades suitable strength is provided by the quenched and tempered.

(Changed edition, Rev. No. 1, 2, 3).



The text of the document is verified by:
the official publication of the
M.: Publishing house of standards, 1989