GOST 14959-79

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  ГОСТ 14959-79

GOST 14959−79 rolled spring carbon and alloy steel. Technical specifications (with Changes 1−6 N, with the Amendment)

GOST 14959−79

Group В32

INTERSTATE STANDARD

THE ROLLED SPRING CARBON AND ALLOY STEEL

Specifications

Spring carbon and alloy steel bars. Specifications

ISS 77.140.25
OKP 09 5800, 11 4100, 5000 11

Date of introduction 1981−01−01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of metallurgy of the USSR

DEVELOPERS

A. S. Kaplan (head of subject); N.P.Liakishev, d-R tekhn. Sciences; L. V. Meander, doctor of engineering. Sciences, R. I. L. Kolesnikova, E. V. Kruchinina, V. M. Busarov; Saramati V. I., Cand. tech. Sciences; V. V. Runov, PhD. tech. Sciences; Y. S. Novokshanov

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 29.03.79 N 1149

3. INSTEAD 14959−69 GOST and GOST 1050−74 in terms of steel grades 60, 70, 75, 80, 85, 60G, 65G, 70G

4. Standard uniform with OBD 6742−73

5. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

The designation of the reference document referenced	The number of the paragraph, subparagraph, enumeration, applications
GOST 8.001−80	4.2
GOST 8.326−89	4.2
GOST 103−76	1.3
GOST 162−90	4.2
GOST 166−89	4.2
GOST 427−75	4.2
GOST 1051−73	2.9, 5.1
GOST 1133−71	1.3
GOST 1497−84	4.5
GOST 1763−68	4.7
GOST 1778−70	3.3, 4.10
GOST 2216−84	4.2
GOST 2590−88	1.3
GOST 2591−88	1.3
GOST 2789−73	2.8
GOST 2879−88	1.3
GOST 3749−77	4.2
GOST 4405−75	1.3
GOST 5378−88	4.2
GOST 5639−82	2.12, 4.8
GOST 5657−69	4.9
GOST 6507−90	4.2
GOST 7417−75	1.3
GOST 7419−90	1.3, 2.9
GOST 7502−89	4.2
GOST 7564−73	4.3
GOST 7565−81	3.3
GOST 7566−94	3.1, 3.2, 5.1, 5.1.1
GOST 8559−75	1.3
GOST 8560−78	1.3
GOST 9012−59	4.6
GOST 10243−75	2.17, 4.13
GOST 12344−2003	4.1
GOST 12345−2001	4.1
GOST 12346−78	4.1
GOST 12347−77	4.1
GOST 12348−78	4.1
GOST 12349−83	4.1
GOST 12350−78	4.1
GOST 12351−2003	4.1
GOST 12352−81	4.1
GOST 12360−82	4.1
Round bar GOST 14955−77	1.3, 2.9, 5.1
GOST 18895−81	4.1
GOST 22536.0−87	4.1
GOST 22536.1−88	4.1
GOST 22536.2−87	4.1
GOST 22536.3−88	4.1
GOST 22536.4−88	4.1
GOST 22536.5−87	4.1
GOST 22536.7−88	4.1
GOST 22536.8−87	4.1
GOST 22536.9−88	4.1
GOST 22536.14−88	4.1
GOST 24597−81	5.1.1
GOST 26877−91	4.2
GOST 28473−90	4.1

6. Limitation of actions taken by Protocol No. 5−94 of the Interstate Council for standardization, Metrology and certification (ICS 11−12−94)

7. EDITION (August 2006), with Changes N 1, 2, 3, 4, 5, 6, approved in November 1982, December 1985, December 1986, June 1987, January 1989 and February 1993 (IUS 2−83, 3−86, 3−87, 9−87, 3−90, 1−94), Amendment (ICS 1−2000 g)


AMENDED, published in the IUS N 12, 1998

An amendment made by the manufacturer of the database


This standard applies to hot-rolled and forged bars with a diameter or thickness up to 250 mm, as well as rental and calibrated with special surface finish that is designed for the manufacture of springs, springs and other machine parts and mechanisms used in the hardened and tempered condition.

As part of the rules of the chemical composition standard applies to all other types of rentals, bars, forgings and stamping.

(Changed edition, Rev. N 5).

1. CLASSIFICATION AND ASSORTMENT

1.1. Rentals are divided as follows:

processing method:

hot rolled and forged;

calibrated;

with special surface finishing;

hot-rolled round with a honed or polished surface;

the chemical composition of steel:

quality;

high quality;

on regulated characteristics and application of categories 1, 1A, 1B, 2, 2A, 2B, 3, 3A, 3B, 3C, 3D, 4, 4A, 4B.

(Changed edition, Rev. No. 5, Amendment).

1.2. Depending on the surface quality of hot rolled and forged rental categories 1, 1A, 1B, 4, 4A, 4B are made of groups 2ГП and 3ГП.

1.3. Assortment of rental and maximum deviations in size shall meet the requirements:

GOST 2590* for hot rolled round, including machined;
________________
* On the territory of the Russian Federation GOST 2590−2006, here and hereafter. — Note the manufacturer’s database.

GOST 2591* for hot-rolled square;
________________
* On the territory of the Russian Federation GOST 2591−2006, here and hereafter. — Note the manufacturer’s database.

GOST 1133 for forged round and square;

GOST 2879 for hot-rolled hexagonal;
________________
* On the territory of the Russian Federation GOST 2879−2006. — Note the manufacturer’s database.

GOST 103 for hot-rolled strip;
________________
* On the territory of the Russian Federation GOST 103−2006. — Note the manufacturer’s database.

GOST 4405 for forged bandpass;

GOST 7419 — for hot rolled strip, trapezoidal-stepped, T-shaped, tapered and grooved categories 2, 2A, 2B, 3, 3A, 3B, 3C and 3D;

GOST 7417 — for calibrated round;

GOST 8559 — calibrated square;

GOST 8560 — calibrated hex;

GOST 14955 — with special surface finish;

other normative-technical documentation.

Examples of symbols

Hire steel hot-rolled round with a diameter of 100 mm, normal precision rolling GOST 2590−88, steel 65G, surface quality group 2ГП, category 4A:

Round-100 GOST 2590−88/65G-2ГП-4A GOST 14959−79

The hot rolled, square, with a side of a square of 30 mm, normal precision rolling GOST 2591−88, steel stamps 50KHFA, category 3A:

Square-30 GOST 2591−88/50KHFA-3A GOST 14959−79

Hot-rolled mill, trapezoid, size () 456, increased accuracy rolling B according to GOST 7419−90, of steel grade 60S2A, category 3B:

Strip trapezoidal B-456 GOST 7419−90/60S2A-3B GOST 14959−79

Rolled grooved, round, with marginal deviations in h11 GOST 7417−75, with a diameter of 15 mm, of steel grade 50KHFA, category 3A, the surface quality group B churchyard 1051−73:

Round h11−15 GOST 7417−75/50KHFA-B-3A GOST 14959−79

Rolled with special surface finish, round, with a diameter of 20 mm, with maximum deviations at the h10 group surface finish D according to GOST 14955−77, of steel grade 80, category 3A:

Round h10−20 GOST 14955−77/80-D-3A GOST 14959−79

Hire steel hot-rolled round with a diameter of 6 mm, normal precision rolling GOST 2590−88, steel 65G, surface quality group 3ГП, category 1A, patented wire:

The circle-6 GOST 2590−88/65G-3ГП-1A GOST 14959−79, for patented wire.

(Amendment. ICS N 12−1998. — Cm. the label «notes»).

Examples of symbols that are allowed to lead in the design documentation:

Hire steel hot-rolled round with a diameter of 100 mm, normal precision rolling GOST 2590−88, steel 65G, surface quality group 2ГП, category 4A:

.

1.2−1.3. (Changed edition, Rev. N 6).

2. TECHNICAL REQUIREMENTS

2.1. The rolled spring carbon and alloy steel shall be manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

2.2. Brand and chemical composition of the steel at plavonia analysis must conform to the standards specified in table.1.

2.3. Mass fraction of phosphorus and sulfur by plavonia analysis in steel of all grades must not exceed the limits specified in table.2.

2.1−2.3 (Amendment).

2.4. Permissible deviations in chemical composition in ready rental shall not exceed the values specified in table.3.

2.5. Depending on normalized characteristics made for hire categories listed in the table.4.

Appendix 1 shows the assignment of the rental depending on the category.

2.5.1. Rental are made in heat-treated (annealed or vysokoopasnye) — categories 1A, 2A, 3A, 3B, 4A, or without heat treatment of category 1, 1B, 2, 2B, 3, 3B, 3G, 4, 4B.

2.6. The hardness of the rental must meet the standards specified in table.5.

2.7. The mechanical properties of the rental categories 3, 3A, 3B, 3C, 3D, 4, 4A, 4B, determined on heat-treated longitudinal samples must conform to the standards specified in table.6.

2.5−2.7. (Amendment).

2.8. The surface quality of the rental must satisfy the requirements of table.7.

Table 1

Steel panel	Steel grade	Mass fraction of elements, %
		Carbon	Silicon	Manganese	Chrome	Vanadium	Tungsten	Nickel	Bor
Of carbon dista	65	0,62−0,70	0,17−0,37	0,50−0,80	Not more than 0.25	-	-	-	-
	70	0,67−0,75	0,17−0,37	0,50−0,80	Not more than 0.25	-	-	-	-
	75	0,72−0,80	0,17−0,37	0,50−0,80	Not more than 0.25	-	-	-	-
	80	0,77−0,85	0,17−0,37	0,50−0,80	Not more than 0.25	-	-	-	-
	85	0,82−0,90	0,17−0,37	0,50−0,80	Not more than 0.25	-	-	-	-
Legero- bathroom	60G	0,57−0,65	0,17−0,37	0,70−1,00	Not more than 0.25	-	-	-	-
	65G	0,62−0,70	0,17−0,37	0,90−1,20	Not more than 0.25	-	-	-	-
	70G	0,67−0,75	0,17−0,37	0,90−1,20	Not more than 0.25	-	-	-	-
	55S2	0,52−0,60	1,5−2,0	0,60−0,90	Not more than 0.30	-	-	-	-
	55S2A	0,53−0,58	1,5−2,0	0,60−0,90	Not more than 0.30	-	-	-	-
	60S2	0,57−0,65	1,5−2,0	0,60−0,90	Not more than 0.30	-	-	-	-
	60S2A	0,58−0,63	1,6−2,0	0,60−0,90	Not more than 0.30	-	-	-	-
	70S3A	0,66−0,74	2.4 to 2.8	0,60−0,90	Not more than 0.30	-	-	-	-
	60S2G	0,55−0,65	1,8−2,2	0,70−1,00	Not more than 0.30	-	-	-	-
	50KHG	0,46−0,54	0,17−0,37	0,70−1,00	0,90−1,20	-	-	-	-
	50KHGA	0,47−0,52	0,17−0,37	0,80−1,00	0,95-of 1.20	-	-	-	-
	55KHGR	0,52−0,60	0,17−0,37	0,90−1,20	0,90−1,20	-	-	-	0,001- 0,003
	50KHFA	0,46−0,54	0,17−0,37	0,50−0,80	0,80−1,10	0,10−0,20	-	-	-
	51HFA	0,47−0,55	0,15−0,30	0,30−0,60	0,75−1,10	0,15−0,25	-	-	-
	50KHGFA	0,48−0,55	0,17−0,37	0,80−1,00	0,95-of 1.20	0,15−0,25	-	-	-
	55S2GF	0,52−0,60	1,5−2,0	0,95−1,25	Not more than 0.30	0,10−0,15	-	-	-
	60S2KHA	0,56−0,64	1,4−1,8	0,40−0,70	0,70−1,00	-	-	-	-
	60S2KHFA	0,56−0,64	1,4−1,8	0,40−0,70	0,90−1,20	0,10−0,20	-	-	-
	65S2VA	0,61−0,69	1,5−2,0	0,70−1,00	Not more than 0.30	-	0,8−1,2	-	-
	60S2N2A	0,56−0,64	1,4−1,8	0,40−0,70	Not more than 0.30	-	-	1,4−1,7	-
	70S2KHA	Of 0.65−0.75	1,4−1,7	0,40−0,60	0,20−0,40	-	-	-	-
Notes: 1. In the designation of steel grades the first two digits indicate the average mass fraction of carbon in hundredths of percent, the letters behind the numbers mean: G — manganese, — silicon, X — chrome, f — vanadium, V tungsten, Nickel. The figures after the letters indicate the approximate mass fraction of the element in integer units. The lack of numbers means that in the brand contains up to 1.5% of this alloying element. When the mass fraction of the element over 1.5% to 2.5% after the letter corresponding to the element, put number 2, over 2.5% figure 3. In the name of grades of steel, with a mass fraction of up to 0.9% of manganese (for upper limit), the letter «G» is not included. 2. In steel of all grades mass fraction of copper residual must not exceed 0.20%, and residual Nickel is 0.25%. 3. In accordance with the order of steel produced scrap-process and scrap-ore process, the residual mass fraction of copper not more than 0.30% Nickel and not more than 0.40% for rental of all categories, chromium not more than 0.30% for rental categories 2, 2A, 2B, 3, 3A, 3B, 3C and 3D made of carbon steel and not more than 0.40% for rental of categories 1, 1A, 1B, 4, 4A and 4B. 4. In steel 60S2G total mass fraction of sulfur and phosphorus shall not exceed 0.06 percent. 5. Steel brand 51HFA intended for the manufacture of spring wire. 6. For the manufacture of patented wire used steel grades 65, 70, 75, 80, 85 with a mass fraction of manganese 0,30−0,60% brands 65G and 70G with a mass fraction of manganese of 0.70 to 1.00%. In steel, designed for patented wire mass fraction of chromium should not exceed 0.15%, Nickel of 0.15%, copper — 0.20%. Mass fraction of sulfur and phosphorus is in accordance with the requirements of the standards to the wire, but not exceeding the limits specified in table.2. In accordance with the order in steel grades 65, 70, 75, 80 and 85, intended for the manufacture of patented wire, the mass fraction of manganese 0,40−0,70%. 7. At the request of the consumer, the lower mass fraction of manganese in steel, not alloy of chromium and Nickel, may be reduced against the norms table.1 the amount of manganese equivalent (), but not more than 0.30%. The value of manganese equivalent is determined by the formula , where , , is the residual mass fraction of chromium, Nickel, and copper in steel, not exceeding the norms table.1.

(Changed edition, Rev. N 2, 4, 5).

Table 2

The class began	Mass fraction of elements, %, not more
	phosphorus	sulfur
Quality	0,035	0,035
High quality	0,025	0,025
Notes: 1. Rental of high-quality steel grades 65, 70, 75, 80, 85, 60G, 65G and 70G can be made with a mass fraction of sulfur and phosphorus in accordance with the requirements of table.2 for stainless steel. In this case, the name of the grade of steel is added to the letter A. 2. In the rental of high-quality steel grades 65, 70, 75, 80, 85, 60G, 65G, 70G, categories 1, 1A, 1B, 4, 4A, 4B mass fraction of sulfur is allowed to 0.040%.

(Changed edition, Rev. N 5).

Table 3

The name of the element	The upper limiting mass fraction of elements, %	The permissible deviations, %
Carbon	According to table.1	±0,01*
Silicon	Less than 1.0	±0,02
	1.0 and not more than	±0,05
Manganese	Less than 1.0	±0,02
	1.0 and not more than	±0,05
Chrome (for steel alloyed with chromium)	Less than 1.0	±0,02
	1.0 and not more than	±0,05
Nickel	According to table.1	-0,05
Vanadium	According to table.1	±0,02
Tungsten	According to table.1	±0,05
Phosphorus	According to table.2	+0,005**
______________ * Deviations for steel grades 55S2A, 60S2A, 50KHGA not allowed. ** For stainless steel deviation for phosphorus is not allowed.

Table 4

Standard features

Category

1

1A

1B

2

2A

2B

3

3A

3B

3B

3G

4

4A

4B

Chemical composition

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

The hardness of the hire in the heat-treated

-

+

-

-

+

-

-

+

-

+

-

-

+

-

The hardness of the rolled, without heat treatment

-

-

+

-

-

+

-

-

+

-

+

-

-

+

Hardenability

-

-

-

+

+

+

-

-

-

+

+

-

-

-

The mechanical properties determined in tension on the heat-treated samples (quenching + tempering)

-

-

-

-

-

-

+

+

+

+

+

+

+

+

Full size bezoperatsionnogo layer

-

-

-

+

+

+

+

+

+

+

+

-

-

-

Notes: 1. The «+" sign means that the characteristic is normalized. The sign «-" indicates that feature is not standardized. 2. For rental with special surface finish decarburization is checked for all categories of hire.

(Changed edition, Rev. N 2).

Table 5

Steel grade	The hardness of the rental
	raw (categories 1B, 2B, 3B, 4B, 3G)		heat treated (categories 1A, 2A, 3A, 3B, 4A)
	NV, not more than	indentation diameter, mm, not less	NV, not more than	indentation diameter, mm, not less
65	255	3,8	229	4,0
70	269	3.7 V	229	4,0
75, 60G, 65G, 70G, 55S2, 55S2A	285	3,6	241	3,9
80, 85, 60S2, 60S2A, 70S3A, 50KHG, 50KHGA, 55KHGR, 50KHFA, 55S2GF, 60S2N2A	302	3,5	269	3.7 V
60S2G	321	3,4	269	3.7 V
50KHGFA, 60S2KHA, 60S2KHFA, 65S2VA	321	3,4	285	3,6
Note. In the manufacture of rolled, without heat treatment, in rolls of a deviation in hardness + 10НВ.

(Changed edition, Rev. N 2).

Table 6

Steel grade	The mode of heat treatment (approximate)			Mechanical properties, not less
	Tempe temperature of hardening, °C	The quenching medium	Temperature vacation, °C	Yield strength MPa (N/mm)	Temporary resistance tion , MPa (N/mm)	Take tional elongation, %	Take significant narrowing , %
65	830	Oil	470	785 (80)	980 (100)	10	35
70	830	Oil	470	835 (85)	1030 (105)	9	30
75	820	Oil	470	885 (90)	1080 (110)	9	30
80	820	Oil	470	930 (95)	1080 (110)	8	30
85	820	Oil	470	980 (100)	1130 (115)	8	30
60G	830	Oil	470	785 (80)	980 (100)	8	30
65G	830	Oil	470	785 (80)	980 (100)	8	30
70G	830	Oil	470	835 (85)	1030 (105)	7	25
55S2 55S2A	870	Oil or water	470	1175 (120)	1270 (130)	6	30
60S2	870	Oil	470	1175 (120)	1270 (130)	6	25
70S3A	850	Oil	470	1470 (150)	1670 (170)	6	25
60S2G	870	Oil	470	1325 (135)	1470 (150)	6	25
50KHG 50KHGA	850	Oil	470	1175 (120)	1270 (130)	7	35
55KHGR	850	Oil	470	1175 (120)	1270 (130)	7	35
60S2A	870	Oil	420	1375 (140)	1570 (160)	6	20
50KHFA	850	Oil	470	1080 (110)	1270 (130)	8	35
50KHGFA	850	Oil	470	1325 (135)	1420 (145)	6	35
55S2GF	870	Oil	470	1375 (140)	1570 (160)	6	25
60S2KHA	870	Oil	470	1325 (135)	1470 (150)	6	25
60S2KHFA	870	Oil	470	1470 (150)	1670 (170)	6	25
65S2VA	850	Oil	420	1665 (170)	1860 (190)	5	20
60S2N2A	870	Oil	470	1325 (135)	1470 (150)	8	30
Notes: 1. Norms of relative narrowing are for round specimens. 2. Thermal processing is performed on the samples designed for mechanical tests. 3. Norms of mechanical properties are samples taken from the rolled diameter or thickness up to 80 mm When the test rolled diameter or thickness over 80 to 150 mm permitted a reduction of the elongation is 2%, the relative narrowing by 5% in comparison with the standards specified in table.6. For rental with a diameter or thickness greater than 150 mm permitted a reduction of the elongation is 3%, the relative narrowing by 10%. Norms of mechanical properties of rolled diameter or thickness greater than 100 mm, perinatalnyj or turned into a square the size of 90−100 mm must conform to the standards specified in table.6.

(Changed edition, Rev. N 2).

Table 7

Treatment	Category rental	Surface quality
Hot rolled and forged	1, 1A, 1B, 4, 4A, 4B	On the surface of rods, strips and coils of the group surface quality 2ГП should not be smoothed out bubbles, rolling shells, sunsets, and uninhibited rolled out of the dirt and cracks of tension. Local defects on surface should be removed by gentle cutting or Stripping, the width of which shall not be less than five times the depth.
		(Amendment. ICS N 12−1998. — Cm. the label «notes»).
		The cleaning depth of defects shall not exceed the following values:
		6% of the diameter or thickness for bars larger than 200 mm;
		5% of the diameter or thickness for bars in sizes from 140 to 200 mm;
		the sum of limit deviations for rods ranging from 80 to 140 mm;
		half of the sum of limit deviations for bars smaller than 80 mm.
		The depth of Stripping defects is considered to be of the actual size.
		In one section of bars is the size (diameter or thickness) greater than 140 mm allowed no more than two sweeps maximum depth.
		On the surface of rods, strips and coils allowed without Stripping some small risks, dents and Rabina within a half of the sum of limit deviations, and small bubbles rolled out with a depth not exceeding ¼ of the sum of the limit deviations on size, but not more than 0.20 mm.
		On the surface of bars and coils of the group surface quality 3ГП local defects are not allowed if their depth exceeds:
		(Amendment. ICS N 12−1998. — Cm. the label «notes»).
		the sum of limit deviations for bars of size 100 mm and over:
		minus tolerance on the diameter or the thickness for bars smaller than 100 mm.
		The depth of defect is calculated from the nominal size.
HR	2, 2A, 2B, 3, 3A, 3B, 3C, 3G	On the surface of bars and strips should not be rolled, cracking, blistering and dirt, rolling shells, rabini, katanoi scale. Local surface defects shall be removed by gentle sanding or Stripping in the longitudinal direction and should not withdraw the strip and the rod beyond the smallest permitted size. Felling defects on the surface of the stripes and bars are not allowed.
Hot-rolled with a honed or polished surface	2, 2A, 2B, 3, 3A, 3B, 3C, 3G	The surface roughness should be no more than setting Rz40 µm according to GOST 2789 or according to agreed standards.
Calibrated	1, 1A, 1B, 2, 2A, 2B, 3, 3A, 3B, 3C, 3D, 4, 4A, 4B	According to GOST 1051, group of a surface B, and C
Rolled with special surface finish	1, 1A, 1B, 2, 2A, 2B, 3, 3A, 3B, 3C, 3D, 4, 4A, 4B	According to GOST 14955, group surface finishes B, C, D, e

(Changed edition, Rev. N 5, 6).

2.9. Hot rolled and forged bars and strips have to be cut.

Slant the cut strips for springs shall comply with the GOST 7419. Cocina cutting wrought-iron strips, hot rolled strips (except leaf) and bar size to 30 mm is not regulated. More than 30 mm should not exceed 0.1 of the diameter or thickness. Bars and strips up to 40 mm with variable length is allowed to produce neobreznye ends.

For bars and stripes category 2, 2A, 2B, 3, 3A, 3B, 3C, 3G burrs should be ground, bend ends are not allowed.

(Amendment. ICS N 12−1998. — Cm. the label «notes»).

When cutting on presses, shears and hammers under the agreement with the consumer, the slight wrinkling of the ends of the rods and strips. The magnitude of buckling of the ends, if necessary, established by agreement between manufacturer and user.

The bars and stripes of categories 1, 1A, 1B, 4, 4A, 4B are allowed crumpled ends and burrs.

Trim the ends of the calibrated rolled products — according to GOST 1051, with special surface finishing — according to GOST 14955.

(Changed edition, Rev. N 6).

2.10. The macrostructure of rolled or bends on the etched transverse templeto should not have residues shrinkage, porosity, bubbles, delaminations, cracks, inclusions and placenow.

Point heterogeneity, Central porosity, phase separation in the square should not exceed the score of 2 according to GOST 10243 for hire categories 2, 2A, 2B, 3, 3A, 3B, 3C, 3G and score 3 for rental of other categories.

(Amendment).

2.11. The round hot rolled bars with machined and polished surface with special surface finish manufactured without bezoperatsionnogo layer.

Depth bezoperatsionnogo layer rolled in categories 2, 2A, 2B, 3, 3A, 3B, 3C, 3D on the side should not exceed the limits specified in table.8.

Table 8

The diameter or thickness of the rolling, mm	Permitted total depth of decarburization, %
	for all steels, except for doped silicon	for steels alloyed with silicon
Up to 8	2,0	2,5
SV. 8	1,5	2,0

2.12. Steel grades 50KHG, 50KHGA, 50KHGFA, 60S2, 55S2, 60S2A, 55S2A must be verified by the amount of the austenitic grain. For steel grade 50KHGFA the austenitic grain size shall be no larger than 6 rooms, and for other grades of steel is not larger than the 5-th numbers according to GOST 5639.

(Changed edition, Rev. N 2).

2.13. On demand of the consumer steel produce:

a) with narrowed limits of the mass fraction of carbon compared to the norms table.1;

b) with a mass fraction of sulfur, not more than 0,015% and phosphorus not more than 0,020% in high-grade steel;

C) with a normalized size of austenite grains is not larger than the number 5 for steel grades not listed in clause 2.12;

g) with the normalized microstructure;

d) with a normalized contamination of non-metallic inclusions;

e) test of fatigue;

g) with determination of elastic limit;

h) control and troost martensitic-martensitic sections and depth of sorbitol vacation in the microstructure of rolled products with surface quality group 2ГП for the manufacture of wire.

Note. Rules for sub-items a, d, e, f, g, h are set by agreement between the consumer and the manufacturer.


(Changed edition, Rev. N 2, 5).

2.14. Rules hardenability rental categories 2, 2A, 2B, 3B, and 3G are established in consultation with the consumer.

Appendix 2 shows bands of hardenability for steel grades 55S2, 55S2A, 60S2, 60S2A, 50KHGFA.

In Annex 3 shows the fluctuation range of hardness (maximum and minimum) along the length of the end samples, in Appendix 4 — maximum dimensions of rolled products of different brands for the manufacture of springs.

2.13, 2.14 (Amendment).

3. ACCEPTANCE RULES

3.1. Rental take parties, consisting of the rental of one melting, one size and one mode of heat treatment and drawn up by one document on quality in accordance with GOST 7566.

(Changed edition, Rev. N 2).

3.2. Rules of acceptance GOST 7566.

3.3. To check the quality of hire from the party of bars, strips and coils are selected:

chemical analysis of the sample according to GOST 7565; control residual chromium, copper and Nickel is carried out periodically at least once a quarter. In the manufacture of steel tailored manganese equivalent control residual copper, Nickel and chromium is carried out for each cast;

to control the macrostructure of the fracture or etching to determine the microstructure, tensile tests (yield strength, temporary resistance, relative elongation, relative narrowing) two of the bar or coil, the two bands;

to test the hardness — less than 2% bands (bars, coils), but not less than three stripes (bars, coils);

to determine hardenability is one sample from melting — ladle;

to determine the depth bezoperatsionnogo layer three rod, strip or coil;

for the determination of grain size — one sample from melting ladle;

to determine non-metallic inclusions of the sample according to GOST 1778;

for quality control of surface and size — all bars, strips and coils.

(Changed edition, Rev. N 2, Amendment).

4. TEST METHODS

4.1. The chemical composition of the steel is carried out according to GOST 22536.0 to GOST 22536.5, GOST 22536.7 -22536.9 GOST, GOST 22536.14, 28473 GOST, GOST 12344 — 12352 GOST, GOST 12355, 12360 GOST and GOST 18895* or other methods providing the required accuracy.
________________
* On the territory of the Russian Federation GOST 18895−97. — Note the manufacturer’s database.

4.2. The geometric dimensions and shape determine the measuring tools according to GOST 26877, 162 GOST, GOST 166, GOST 427, GOST 2216, GOST 3749, 5378 GOST, GOST 6507, GOST 7502* and templates according to normative-technical documentation, or tools and templates, certified according to GOST 8.001** or GOST 8.326**.
_________________
* On the territory of the Russian Federation GOST 7502−98. — Note the manufacturer’s database.
** On the territory of the Russian Federation PR 50.2.009−94***.


*** On the territory of the Russian Federation the document is not valid. Apply the Procedure of testing standard specimens or means of measurement for the purposes of type approval, the Procedure for approval of type of standard samples or type of measuring instruments, the Procedure for issuing certificates on approval of type of standard samples or type of measuring instruments, establishment and changing of the validity period of these certificates and the interval between verifications of measuring instruments, Requirements to the signs of type approval for standard samples or type of measuring instruments and their application, approved by order of Minpromtorg of Russia of 30 November 2009 # 1081. — Note the manufacturer’s database.

4.1; 4.2. (Changed edition, Rev. N 5).

4.3. The surface quality of the rolled checked visually, using, if necessary, cleaning the surface.

Allowed to use non-destructive methods of control.

4.4. Sampling for mechanical tests according to GOST 7564 (scheme of cutting samples as per option 2).

Sampling from coils for all types of tests done at a distance of at least 1.5 round from end of roll.

4.5. Tensile test (yield strength, temporary resistance, relative elongation, relative narrowing) is carried out according to GOST 1497 on samples five times the length.

(Changed edition, Rev. N 5).

4.6. Brinell hardness number is determined according to GOST 9012. Hardness measurement strip, trapezoidal and T-shaped profile is produced in the large cross-section of the strip.

4.7. Determination of the depth bezoperatsionnogo layer produced according to GOST 1763.

Strip trapezoidal and T-shaped profile controlled by the site of maximum thickness.

(Amendment).

4.8. Determination of grain size is produced according to GOST 5639.

Control of grain size of steel 55S2 brands, 55S2A, 60S2, 60S2A may not be made subject to compliance with the steel requirements of this standard.

4.9. Hardenability is determined by the method of mechanical hardening according to GOST 5657.

4.10. The definition of non-metallic inclusions are produced according to GOST 1778 (method SH1 or Ш4).

4.11. To control the macrostructure, mechanical properties and the grain size allowed the use of nondestructive methods.

4.12. The manufacturer is allowed to inspect macrostructure, mechanical properties and hardenability at the intermediate workpiece or varietal hire a larger cross-section and test results to extend to all profiles in this heat.

The grain size is allowed to determine when plavochek control.

4.13. Control of macrostructure is carried out according to GOST 10243.

4.14. When using the manufacturer’s statistical methods of testing hardness and mechanical properties in accordance with regulatory and technical documentation approved in the established order, control of hardness and mechanical properties required by this standard, the manufacturer is allowed not to perform. The manufacturer guarantees the compliance of products to requirements of this standard. In arbitration cases, and periodic reviews of product quality apply control methods stipulated by this standard.

4.13; 4.14. (Added, Rev. N 2, 3).

4.15. Methods of monitoring fatigue, elasticity and microstructure are established by agreement between the consumer and the manufacturer.

(Added, Rev. N 5).

5. PACKING, MARKING, TRANSPORTATION AND STORAGE

5.1. Packing, marking, transportation and storage of hot-rolled and forged-rolled — GOST 7566 with the Supplement.

The outer diameter of the coils should be no more than 1500 mm, the inner is not less than 180 mm.

Packing, marking, transportation and storage of the calibrated rolled products — according to GOST 1051, rolled with special surface finish — GOST 14955.

(Changed edition, Rev. N 2, 5).

5.1.1. Products transporterowych by all kinds of transport in accordance with cargo carriage regulations applicable to transport of this species.

Weight of cargo must not exceed for mechanical loading on open vehicles — 10000 kg, indoor — 1250 kg.

The means of packaging — according to GOST 7566.

When transporting two or more parcels, the dimensions of which allow you to arrange transport package with dimensions according to GOST 24597, the package needs to be formed into transport packets according to NTD.

(Added, Rev. N 2).

5.2. (Deleted, Rev. N 5).

ANNEX 1 (reference). THE PURPOSE OF THE RENTAL

ANNEX 1
Reference

Category on normalized characteristics	The purpose of the rental
2, 2A, 2B, 3, 3A, 3B, 3C, 3G	For the manufacture of elastic elements-springs, springs, torsion bars, etc.
3A, 3B, 3C, 3G	For the manufacture of automobile springs and springs
1, 1A, 1B, 4, 4A, 4B	For use as a structural

APPENDIX 1. (Changed edition, Rev. No. 5, Amendment).

ANNEX 2 (informative). STRIP HARDENABILITY OF STEEL

ANNEX 2
Reference

Damn.1. Steel brand 55S2, 55S2A

Damn.1

Damn.2. Steel brand 60S2, 60S2A

Steel brand 60S2, 60S2A

Damn.2

Damn.3. Steel brand 60S2G

Steel brand 60S2G

Damn.3

Damn.4. Steel brand 50ХГФ

Steel brand 50ХГФ

Damn.4

APPENDIX 3 (reference). THE FLUCTUATION RANGE OF HARDNESS (MAXIMUM AND MINIMUM) IN LENGTH FOR MECHANICAL SAMPLES OF FINE BANDS OF HARDENABILITY

APPENDIX 3
Reference

Distance from end, mm	Hardness HRC for bands of hardenability steel grades
	55S2, 55S2A		60C2, 60C2A		60S2G		50KHGFA
	max	min	max	min	max	min	max	min
1,5	65	57	66	59	66	59	65	56
3,0	63	55	66	58	66	58	65	56
4,5	61	50	65	56	65	57	64	56
6,0	58	46	64	53	65	55	64	56
7,5	56	41	63	47	64	49	63	55
9,0	54	37	62	43	63	45	63	53
10,5	51	35	60	40	62	42	62	51
12,0	48	33	59	37	60	39	62	48
13,5	45	32	57	36	58	37	61	46
15,0	43	31	55	34	57	36	59	43
16,5	41	29	53	33	55	35	58	42
18,0	40	29	51	32	53	33	57	40
19,5	39	28	49	31	51	32	56	38
21,0	38	28	47	30	49	32	56	37
22,5	38	27	46	29	48	31	54	36
24,0	37	27	44	29	46	30	54	35
27,0	36	26	42	28	44	29	52	34
30,0	36	26	41	27	43	28	50	33
33,0	35	26	40	26	42	28	48	32
36,0	35	26	39	25	41	27	47	31
39,0	34	25	38	25	40	27	45	30
42,0	33	24	37	24	40	26	44	29
45,0	33	24	37	24	39	26	43	29

ANNEX 4 (reference). THE MAXIMUM ALLOWABLE SIZE FOR THE MANUFACTURE OF SPRINGS

ANNEX 4
Reference

Steel grade	Maximum dimensions, mm
	bars	diameter or square side
80	8	12
55S2	8	12
55S2A	8	12
60C2	14	20
60C2A	14	20
60S2G	16	24
50KHG	14	25
50KHGA	14	25
50ХГР	24	30
50KHGFA	24	25
55S2GF	25	30

ANNEX 4. (Changed edition, Rev. N 5).