GOST 1414-75

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  ГОСТ 1414-75

GOST 1414−75 rolled structural steel, high machinability. Specifications (with Amendments No. 1, 2, 3)

GOST 1414−75

Group В32

INTERSTATE STANDARD

ROLLED STRUCTURAL STEEL, HIGH
MACHINABILITY

Specifications

Constructional rolled steel of improved and high
cutting machinability. Specifications

OKP 09 5040

Date of introduction 1977−01−01

INFORMATION DATA

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

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 29.07.75 N 1977

3. REPLACE GOST 1414−54

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

The designation of the reference document referenced	The item number, app
GOST 1051−73	1A.1, 2.10, 2.12, 2.15; 5.1
GOST 1497−84	4.5, 4.11
GOST 1763−68	4.6
GOST 2590−88	1A.1
GOST 2591−88	1A.1
GOST 2879−88	1A.1
GOST 3118−77	App
GOST 3760−79	App
GOST 4461−77	App
GOST 4543−71	2.1, 2.9
GOST 5639−82	4.7
GOST 5657−69	4.9
GOST 7417−75	1A.1
GOST 7564−97	4.4
GOST 7565−81	3.4, 4.4
GOST 7566−94	2.15, 3.1, 5.1, 5.3
GOST 8559−75	1A.1
GOST 8560−78	1A.1
GOST 9012−59	4.8
GOST 9454−78	4.5
GOST 10243−75	4.3
GOST 11293−89	App
GOST 12344−88	4.1
GOST 12345−2001	4.1
GOST 12346−78	4.1
GOST 12347−77	4.1
GOST 12348−78	4.1
GOST 12350−78	4.1
GOST 12352−81	4.1
GOST 12354−81	4.1
GOST 12355−78	4.1
Round bar GOST 14955−77	1A.1, 1A.2, 2.10, 2.10 a, 2.12, 2.15
GOST 15846−79	2.15
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 24597−81	5.3
GOST 28473−90	4.1, Annex

5. Limitation of actions taken by Protocol No. 7−95 Interstate Council for standardization, Metrology and certification (ICS 11−95)

6. EDITION with Amendments No. 1, 2, 3, approved in September 1981, August 1986, December 1989 (IUS 12−81, 11−86, 3−90), as Amended (ICS 5−91, 12−98, 12−2001)


This standard applies to hot-rolled, grooved and grinded rolled and rolled with special surface finish, designed for processing on machines and vending machines, and for forming in the hot state, followed by cutting, manufactured in bars and coils for the needs of national economy and for export.

As part of the rules of the chemical composition standard applies to bars and all other types of rentals (compression disc, blank).

(Changed edition, Rev. N 2, 3).

1. CLASSIFICATION

1.1. Depending on the chemical composition of the steel is divided into five groups: carbon sulfur, serotonergically, carbon lead, serotonergically lead-containing, lead-containing alloy.

(Changed edition, Rev. N 2).

1.2. The types of processing rental divided into:

hot-rolled;

calibrated;

round with special surface finish;

with round machined surface.

Rental of steel grade A12 with 01.01.91 not allowed to use in the newly created and upgraded technology.

(Changed edition, Rev. N 1, 2, 3).

1.3. As material rental made:

without heat treatment;

heat-treated — T;

full hard — N (for calibrated rolled) and rolled with special surface finish.

(Changed edition, Rev. N 1, 3).

1.4. Depending on the destination hot-rolled steel is divided into subgroups:

a — for hot forming;

b — for cold mechanical processing (turning, planing, milling, etc.) across the surface;

in — for cold drawing (rolled).

The purpose of the rental (sub-group) must be specified in the order.

(Changed edition, Rev. N 2, 3).

1A. BASIC PARAMETERS AND DIMENSIONS

1A.1. The form, dimensions and limit deviations of the hire must meet the requirements of GOST 2590, GOST 2591, GOST 2879, GOST 7417, GOST 8559, 8560 GOST, GOST 14955 and other normative-technical documentation.

Examples of symbols

Hire steel hot-rolled round with a diameter of 48 mm, the usual accuracy of rolling according to GOST 2590, brand AS30KHM for hot pressure treatment (subgroup a), thermally treated:

Rental calibrated hex key size 10 mm with tolerance field h11 churchyard 8560, grades A11, with surface quality group according to GOST 1051, full hard:

Rolled with special surface finish, round with a diameter of 10 mm, quality h9 churchyard 14955, brand AS14, surface quality group according to GOST 14955, full hard:

1A.2. Dimensions and limit deviations of machined rentals are established according to GOST 14955 and other normative-technical documentation.

Sec. 1A. (Changed edition, Rev. N 2, 3).

2. TECHNICAL REQUIREMENTS

2.1. Brand and chemical composition of steel shall be as specified in table.1.

Table 1

Group steel	Steel grades	Mass fraction of elements, %
		Carbon	Silicon	Manganese	Chrome	Nickel
Carbon sulfur	A11	0,07−0,15	Not more than 0.10	0,80−1,20	Not more than 0.25	Not more than 0.25
	A12	0,08−0,16	0,15−0,35	0,70−1,10	Not more than 0.25	Not more than 0.25
	A20	0,17−0,25	0,15−0,35	0,70−1,00	Not more than 0.25	Not more than 0.25
	A30	0,26−0,35	0,15−0,35	0,70−1,00	Not more than 0.25	Not more than 0.25
	A35	0,32−0,40	0,15−0,35	0,70−1,00	Not more than 0.25	Not more than 0.25
Serotonergically	A40G	0,37−0,45	0,15−0,35	1,20-of 1.55	Not more than 0.25	Not more than 0.25
Carbon lead	AS40	0,37−0,45	0,17−0,37	0,50−0,80	Not more than 0.25	Not more than 0.25
Serotonergically lead	AS14	0,10−0,17	Not more than 0.12	1,00−1,30	Not more than 0.25	Not more than 0.25
	AS35G2	0,32−0,39	0,17−0,37	1,35−1,65	Not more than 0.25	Not more than 0.25
	AS45G2	0,40−0,48	Not more than 0.15	1,35−1,65	Not more than 0.25	Not more than 0.25
Lead-containing alloy	AS12KHN	0,09−0,15	0,17−0,37	0,30−0,60	0,40−0,70	0,50−0,80
	AS14KHGN	0,13−0,18	0,17−0,37	0,70−1,00	0,80−1,10	0,8−1,1
	AS19KHGN	0,16−0,21	0,17−0,37	0,70−1,10	0,80−1,10	0,8−1,1
	AS20KHGNM	0,18−0,23	0,17−0,37	0,70−1,10	0,40−0,70	0,40−0,70
	AS30KHM	0,27−0,33	0,17−0,37	0,40−0,70	0,80−1,10	Not more than 0.30
	AS38KHGM	0,34−0,40	0,17−0,37	0,60−0,90	0,80−1,10	Not more than 0.30
	AS40KHGNM	0,37−0,43	0,17−0,37	0,50−0,80	0,60−0,90	0,7−1,1
	AS40KH	0,36−0,44	0,17−0,37	0,60−0,90	0,80−1,10	Not more than 0.30

Extension table 1

Group steel	Steel grades	Mass fraction of elements, %
		Molybdenum	Sulfur	Phosphorus	Lead	Selenium	Copper
Carbon sulfur	A11	-	0,15−0,25	0,06−0,12	-	-	Not more than 0.25
	A12	-	0,08−0,2	0,08−0,15	-	-	Not more than 0.25
	A20	-	0,08−0,15	Not more than 0.06	-	-	Not more than 0.25
	A30	-	0,08−0,15	Not more than 0.06	-	-	Not more than 0.25
	A35	-	0,08−0,15	Not more than 0.06	-	-	Not more than 0.25
Serotonergically	A40G	-	0,18−0,30	Not more than 0.05	-	-	Not more than 0.25
Carbon lead	AS40	-	Not more than 0.04	Not more than 0,040	0,15−0,30	-	Not more than 0.25
Serotonergically lead	AS14	-	0,15−0,30	Not more than 0.10	0,15−0,30	-	Not more than 0.25
	AS35G2	-	0,08−0,13	Not more than 0.04	0,15−0,30	-	Not more than 0.25
	AS45G2	-	0,24−0,35	Not more than 0.04	0,15−0,35	-	Not more than 0.25
Lead-containing alloy	AS12KHN	-	Not more than 0,035	Not more than 0,035	0,15−0,30	-	Not more than 0.30
	AS14KHGN	Not more than 0.10	Not more than 0,035	Not more than 0,035	0,15−0,30	-	Not more than 0.30
	AS19KHGN	Not more than 0.10	Not more than 0,035	Not more than 0,035	0,15−0,30	-	Not more than 0.30
	АС20ХГН	0,15−0,25	Not more than 0,035	Not more than 0,035	0,15−0,30	-	Not more than 0.30
	AS30KHM	0,15−0,25	Not more than 0,035	Not more than 0,035	0,15−0,30	-	Not more than 0.30
	AS38KHGM	0,15−0,25	Not more than 0,030	Not more than 0,035	0,15−0,30	-	Not more than 0.30
	AS40KHGNM	0,15−0,25	Not more than 0,030	Not more than 0,035	0,15−0,30	-	Not more than 0.30
	AS40KH	-	Not more than 0,035	Not more than 0,035	0,15−0,30	-	Not more than 0.30

Notes:

1. Group lead-containing alloy steel total mass fraction of sulfur and phosphorus shall not exceed 0.06 percent.

2. According to the agreement, consumers is permitted to replace lead-selenium lead-containing steel for carbon. The number of selenium should be 2.5 times less than lead.

3, 4. (Deleted, Rev. N 2).

5. In the designation of steel grades the letters mean: A — automatic sulphur, AC — automatic lead-containing E — indicates the presence of selenium. The rest of the notation is in accordance with the notation adopted GOST 4543.


(Changed edition, Rev. N 1, 2, 3, Amendment (ICS 12−98)).

2.1. Rolled structural steel of heightened and high machinability are made in accordance with the requirements of this standard.

(Added, Rev. N 2).

2.2. In ready rental in the observance of mechanical properties and other requirements of this standard allowed variations in chemical composition, which should correspond to those in table.2.

Table 2

The name of the elements	The upper limit of the mass fraction of elements, %	The permissible deviations, %
Carbon	0.30 and less	±0,01
	More than 0.30	±0,02
Manganese	1.00 and less	±0,03
	More than 1,00	±0,05
Silicon	According to table.1	±0,02
Nickel	1.0 and less than	±0,04
	More than 1.0	±0,05
Chrome	0.90 and less than	±0,02
	More than 0.90	±0,05
Molybdenum	According to table.1	±0,02
Lead	According to table.1	±0,03
Phosphorus	0.04 and less	+0,005
	More than 0.04	±0,01
Sulfur	0,035 and less	+0,005
	More than 0,035	+0,02
		-0,01

(Changed edition, Rev. N 2, 3, Amendment (ICS 12−2001)).

2.3. According to customer steel grade A12 is allowed to produce with a sulfur content of 0.08% to 0.15%.

Rental of steel grade A12 with 01.01.91 not allowed to use in the newly created and upgraded technology.

2.4. In steel grade A12 with phosphorus less than 0.10% sulfur content should be 0,10−0,20%.

Rental of steel grade A12 with 01.01.91 not allowed to use in the newly created and upgraded technology.

2.3; 2.4. (Changed edition, Rev. N 3).

2.5. (Deleted, Rev. N 2).

2.6. Hot-rolled steel and rolled round with a machined surface are made as heat-treated (annealed, vysokoopasnye, normalized, normalized high tempering) or without heat treatment.

Calibrated rental supply cold-worked, nagaremono-released and thermally treated conditions (annealed, normalized, normalized high holidays, improved (quenching+tempering), and steel with special surface finish — cold-worked, nagaremono-tempered or annealed condition.

Improved produce only rental brands AS35G2, AS30KHM, AS40KHGNM not larger than 35 mm.

Rental brands A11, AS14, A12, A20, AS12KHN manufactured without heat treatment.

The condition of the rental is determined by the consumer.

Rental of steel grade A12 with 01.01.91 not allowed to use in the newly created and upgraded technology.

(Changed edition, Rev. N 1, 2, 3).

2.7. Mechanical properties and hardness of hot-rolled and calibrated thermally not processed rental must meet the standards specified in table.3.

Table 3

Steel panel	Steel grade	Size, mm	Treatment	The yield strength, N/mm (kgf/mm)	Times — ing resistance, N/mm (kgf/mm)	Regarding elongation , %	Regarding narrowing , %	Indentation diameter, mm, not less	The number of hardness HB, no more
				not less than
Carbon sulfur	A11			-	410 (42)	22	34	4,75	160
	A12		Horacek — tanaya without heat treatment	-	410 (42)	22	34	4,75	160
	A20	All time — steps		-	450 (46)	20	30	4,65	168
	A30			-	510 (52)	15	25	4,45	185
	A35			-	510 (52)	15	23	4,25	201
	A11			390 (40)	490 (50)	10	-	4,20	207
	A12	30 and less	Calibro — bathroom neartown — Naya	-	510 (52)	7	-	4,10	217
	A12	SV. 30		-	460 (47)	7	-	4,10	217
	A20	All time — steps		-	530 (54)	Seven	-	4,10	217
	A30		Combined nagarta — bathroom	-	540 (55)	6	-	4,05	223
	A35			-	570 (58)	6	-	Of 4.00	229
Sulfur — morganza — Vista	A40G	All time — steps	Horacek — tanaya without heat treatment	-	590 (60)	14	20	4,20	207
Sulfur — morganza — Vista lead — containing	AS14	All time — steps	Horacek — tanaya without heat treatment	-	410 (42)	20	30	4,60	170
	AS14		Calibro — Nagato bathroom — bathroom	390 (40)	490 (50)	10	-	4,20	207

Notes:

1. Mechanical properties-worked rental brands, A20, A30, and A35 are determined by the requirement of the user.

2. (Deleted, Rev. N 2).

3. By agreement with the consumer to ensure the mechanical properties and hardness allowed softening heat treatment of rolled calibrated steel grades A11, A12, AS14.


Mechanical properties and hardness of heat-treated, calibrated rolled must conform to the standards specified in table.4.

Table 4

Steel panel	Steel grade	Time — measures, mm	Treatment	Yield strength, N/mm (kgf/mm)	Tensile strength , N/mm (kgf/mm)	Regarding elongation , %	Regarding narrowing , %	Indentation diameter, mm, not less	The number of hard — dosti NV, not more than
				not less than
Sulfur — morganza — Vista	A40G	All time — steps	Calibre — the bathroom high — released — tion (annealed probability)	-	590 (60)	17	-	Of 4.00	229
Sulfur — morganza — Vista lead containing	AS35G2	35 and less	Calibro — bathroom superior	590 (60)	740 (75)	14	-	3,65	277
	AS45G2	All time — steps	Calibro — normalize bathroom — bathtub or normalize — bathroom vacation Nagato — bath — released	440 (45)	640 (65)	6	-	3,80	255
Legero- bathroom lead containing	AS30KHM	35 and less	Calibro — bathroom improved	630 (64)	780 (80)	12	3,60	3,60	285
	AS40KHGNM	35 and less	Calibro — bathroom superior or normalize — bathroom	-	-	-	-	3,75−3,50	262−300

Notes:

1. Grooved Bicycle brand A40G allowed to produce cold-worked condition, without the control of mechanical properties, with hardness standards by agreement with the consumer.

2. At the request of the consumer, calibrated rolled brand AS35G2 allowed to produce a temporary resistance not less than 78 kgf/mm.

3. By agreement with the consumer calibrated Bicycle brands AS35G2 and AS30KHM allowed to produce after other types of heat treatment or hardening with meeting the requirements for mechanical properties.


Mechanical properties of rolled steel grades AS40, AS40KH, AS12KHN, AS14KHGN, AS19KHGN, AS20KHGNM, AS30KHM, AS38KHGM, AS40KHGNM determined on heat-treated samples or samples made from heat-treated blanks, must conform to the standards specified in table.5.

Table 5

Steel panel	Steel grade	The mode of heat treatment of samples or blanks to determine mechanical properties				Yield strength, N/mm (kgf/mm)	Temporary company Tule — nie , N/mm (kgf/mm)			Regarding Sitel — tion elongation , %	Regarding Sitel — ing an already — nie , %	The impact strength KCU, j/cm, (kgf·m/cm)		The size of the cross section of blanks for the termi — tion processing (circle diameter or square side)
		Hardening		Vacation
		Temperature, °C	Environment cooling	Temperature, °C	Environment cooling
						not less than
Of carbon dista lead — containing	AS40	Normalization				335 (34)		570 (58)	19		-		-	25
Legero — bathroom lead — containing	AS12KHN	900−920	Oil	150−180	The air	440 (45)		640 (65)	10		-		88 (9)	*
			Water	150−180	The same	590 (60)		780 (80)	8		-		68 (7)	*
	AS14KHGN	860−880	Oil or water	150−180	«	835 (85)		1080 (110)	8		-		78 (8)	*
	AS19KHGN	865−885	The same	150−180	«	930 (95)		1180 (120)	7		-		68 (7)	*
	AS20KHGNM	850−870	«	150−180	«	930 (95)		1180 (120)	7		-		59 (6)	*
	AS30KHM	860−880	Oil	510−560	«	735 (75)		880 (90)	12		-		98 (10)	15
	AS38KHGM	860−880	The same	580−620	«	785 (80)		930 (95)	11		-		78 (8)	25
	AS40KHGNM	830−850	«	580−620	«	835 (85)		980 (100)	12		-		88 (9)	25
	AS40KH	860±15	«	500±50	Water	784 (80)		980 (100)	10		45		59 (6)	25

Note. Norms of mechanical properties specified in table.5 refer to the rolled diameter or thickness up to 100 mm.

Norms of mechanical properties for billets, forge of bars larger than 100 mm, 90−100 mm, shall be as specified in table.5.

In the column «the Size of the cross section of the workpieces to heat treatment (circle diameter or square side)» sign * means that the heat treatment is carried out on prepared samples with allowance for grinding.


Mechanical properties of steel with special surface finish are determined by the requirement of the user and must conform to the standards specified in table.3−5.

The hardness of the calibrated hire, determined by user demand, as well as the hardness of the steel surface machined and hot rolled for machining must conform to the standards specified in table.6.

Table 6

Group steel	Steel grade	Hot-rolled steel				Steel grooved
		Without heat treatment		Annealed, vysokomu whelping, normalize — bathroom with high vacation, normalize — bathroom		Nagarebana		Annealed or after the high holidays
		Indentation diameter, mm, not less	The number of hard — dosti NV, not more than	Indentation diameter, mm, not less	The number of hard — dosti NV, not more than	Indentation diameter, mm, not less	The number of hard — dosti NV, not more than	Indentation diameter, mm, not less	The number of hard — dosti NV, not more than
Carbon lead	AS40	4,10	217	4,40	187	3,90	241	4,30	197
Serotonergically lead	AS35G2	-	-	4,10	217	3,70	269	Of 4.00	229
	AS45G2	-	-	Of 4.00	229	3,70	269	3,90	241
Alloy lead	AS12KHN	-	-	-	-	Of 4.00	269	-	-
	AS14KHGN	-	-	4,40	187	3,70	269	4,25	201
	AS19KHGN	-	-	4,25	201	3,70	269	4,05	223
	AS20KHGNM	-	-	4,25	201	3,70	269	4,05	223
	AS30KHM	-	-	4,05	223	3,70	269	3,90	241
	AS38KHGM	-	-	3,90	241	3,70	269	3,80	255
	AS40KHGNM	-	-	3,90	241	3,70	269	3,80	255
	AS40KH	-	-	4,10	217	3,70	269	3,95	235

Note. Rental ordered in the annealed condition, is allowed to produce without annealing and high vacation with a hardness corresponding standards specified in table.6 for the annealed and vysokoopasnye States.


Rental of steel grade A12 with 01.01.91 not allowed to use in the newly created and upgraded technology.

(Changed edition, Rev. N 2, 3, Amendment (ICS 5−91)).

2.8. The hardness of the rolled diameter or thickness 5 mm and less not defined.

(Changed edition, Rev. N 3).

2.9. The surface quality of hot-rolled subgroups a, b, in must comply with the requirements of GOST 4543, other than grades A11, AS14, A12, A20, A30, A35, A40G, AS35G2, AS45G2. The surface of hot-rolled steel are listed brands of the group in should be clean, free of cracks, sunsets, flaws, and captured.

On the surface of hot rolled bars rolled from the mentioned trademarks are allowed without Stripping some small risks, dents and Rabina within half extreme deviations, as well as small volosovichi depth not exceeding ¼ of the amount of limit for dimension tolerances.

Rental of steel grade A12 with 01.01.91 not allowed to use in the newly created and upgraded technology.

2.10. The surface quality of the calibrated hire must meet trebovaniye 1051 group B. allowed by agreement between manufacturer and consumer (excluding enterprises of Minavtoselhozmash) on a calibrated rolled steel grades A11, AS14, A12, A20, A30, A35, A40G, AS35G2, AS45G2 small volosovichi a depth of 0.2 mm.

The quality of rolled product surface with special surface finish — GOST 14955.

2.10. The surface quality of machined-rolled set with GOST 14955 or other regulatory-technical documentation.

2.11. At the request of the consumer in the rental with a carbon content of more than 0.3% (the lower limit), manufactured without turning and roughing, check the depth of General bezoperatsionnogo layer (ferrite+transition zone), which should not exceed 1.5% of the diameter or thickness of the rod.

Decarburization the bars, made with peeled or skinned surface is not allowed.

2.12. Bars and rods, hot-rolled steel should be trimmed evenly.

When cutting on presses, shears and hammers are allowed under the crumpled ends and burrs. At customer’s request bars up to 140 mm inclusive and coils are made without burrs and crushed ends.

The ends of the rods calibrated for hire must meet the requirements of GOST 1051, rolled with special surface finish and machined — GOST 14955 or other regulatory-technical documentation.

2.13. Macrostructure of steel when testing for treated templeto or fracture should not have placenow, shrinkage, porosity, bubbles, cracks, delamination, inclusions.

Macrostructure of steel of all grades, except grades A11, AS14, A12, A20, A30, A35, A40G, AS35G2, AS45G2 must meet the requirements specified in table.7.

Table 7

Name of defects	Lead-containing alloy	Carbon lead
	The score is not higher
Central porosity	2	3
Point heterogeneity	3	3
Exudation square	2	3
Pousada liquation	1	1

Notes:

1. Allowed to inspect the macrostructure of steel by ultrasonic inspection (UT).

2. For steel grades A11, AS14, A12, A20, A30, A35, A40G, AS35G2, AS45G2 Central porosity, point heterogeneity, exudation square and podnasadochnogo liquation is not normalized.


Rental of steel grade A12 with 01.01.91 not allowed to use in the newly created and upgraded technology.

2.14. At the request of the consumer rental made:

a) with a normalized value of the hereditary austenite grains, which should not be larger than the number 5 (allowed up to 10% of the grains of the 3rd point), except for rental grades A11, A12, A20 and AS14, which grain size is not controlled;

b) with a normalized hardenability, in addition to hire brands, A11, A12, A20, AS14;

C) control of the microstructure after heat treatment according to approved samples, approved in the prescribed manner;

g) narrowed in comparison with specified in the table.1 mass fraction of carbon by orders of automobile and tractor industry excluding permissible deviations by mass percentage of carbon provided in the table.2.

Note. Standards in subparagraphs b, to establish by agreement with the consumer.


Rental of steel grade A12 with 01.01.91 not allowed to use in the newly created and upgraded technology.

2.9−2.14. Changed the wording, Rev. N 3).

2.15. Packaging, labeling — according GOST 7566 with the following additions:

packaging and labelling of the calibrated hire must meet trebovaniye 1051, rolled with special surface finish and machined — GOST 14955.

Packing goods to be sent to the far North and equivalent areas, shall conform to the requirements of GOST 15846.

Goods for export are Packed in accordance with normative and technical documentation, duly approved, and the requirements of the order of foreign trade organizations.

2.16. At the customer’s request ends or the ends of the bars in hot rolled and calibrated rolled in all grades depending on the group should be marked with paint in accordance with table.8.

Table 8

Steel panel	Color marking
Carbon sulfur	Yellow
Serotonergically	Red
Carbon lead	Black
Serotonergically lead	Green
Lead-containing alloy	Blue

2.15; 2.16. (Added, Rev. N 3).

3. ACCEPTANCE

3.1. General acceptance rules of steel — according to GOST 7566.

(Changed edition, Rev. N 3).

3.2. The rods and coils are made parties. The party must consist of bars and coils of the same size, the same melting, the same method of manufacture and heat treatment.

(Changed edition, Rev. N 2).

3.3. Control of surface quality and dimensions is not less than 10% of bars and coils. If unsatisfactory results are subjected to to control the entire party. The surface quality control of hot rolled steel subgroups in carried out at all the bars.

3.4. To check the quality of hire from the party taken:

a) to determine the chemical composition of the melt — sample from melting-ladle, in accordance with the requirements of GOST 7565;

b) to control the macrostructure of the fracture or etching the investigated template from two different bars;

C) for tensile tests — two rods from different bars and coils;

g) to determine toughness — two rods from different bars and coils;

d) to determine the depth bezoperatsionnogo layer — three rods;

e) to test the hardness of not less than three rods;

g) to determine the grain size and hardenability — one rod from melting ladle;

h) to control the microstructure of the two rod roll.

(Changed edition, Rev. N 3).

4. CONTROL METHODS

4.1. Chemical composition of steel is determined according to GOST 12344 — GOST 12348, 12350 GOST, GOST 12352, 12354 series GOST, GOST 12355, 28473 GOST, GOST 22536.0 to GOST 22536.5, 22536.7 GOST-GOST 22536.9 or other methods providing the required accuracy. Mass fraction of lead determined by the method given in the Appendix.

In case of dispute between consumer and manufacturer chemical composition of steel is determined according to the specified standards.

(Changed edition, Rev. N 1, 2).

4.2. The surface quality test without the use of magnifying devices. If necessary, a bleaching or etching of the surface, and rolled with special surface finish diameter up to 3 mm inclusive inspection is carried out at magnifications up to 10.

Allowed to use non-destructive methods of control.

(Changed edition, Rev. N 1, 3).

4.3. Control of macrostructure of steel by etching, or by fracture produce the churchyard 10243, and ultrasound — according to the method of the manufacturer.

4.4. Sampling for mechanical tests are produced according to GOST 7564.

4.5. Tensile tests carried out according to GOST 1497 on two longitudinal samples. Allowed to test real samples from bars with cross section less than 20 mm.

Test for impact strength at normal temperature is carried out on two samples of type 1 GOST 9454.

(Changed edition, Rev. N 1, 2).

4.6. Determination of the depth bezoperatsionnogo layer produced by method M according to GOST 1763, of the three samples.

4.7. Determination of grain size of austenite is carried out according to GOST 5639, on a single sample.

4.8. Hardness on the Brinell hardness is carried out according to GOST 9012.

(Changed edition, Rev. N 2).

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

4.10. Steel melting one, the last test on the macro-structure, hardenability and mechanical properties in large sections of rolled products, when shipped in smaller sections of rolled products listed trials, it is allowed not to.

4.11. By agreement with the consumer allowed to apply statistical and non-destructive testing of mechanical properties tensile according to normative-technical documentation approved in the established order.

In cases of dispute, mechanical properties test tensile carried out according to GOST 1497.

(Added, Rev. N 2).

5. TRANSPORTATION AND STORAGE

5.1. Transportation and storage — by GOST 7566.

(Changed edition, Rev. N 3).

5.2. (Deleted, Rev. N 3).

5.3. Transportation may be conducted by any means of transport in accordance with cargo carriage regulations applicable to the transport of each species, and the technical conditions of loading and fastening of cargoes, approved by the Ministry of Railways of the USSR.

Bundles of rods and coils transporterowych rail carload shipments in covered wagons or with a public rolling stock. When carload shipments and transportation in a single address two or more parcels, the dimensions of which allow it to form a transport package with overall dimensions according to GOST 24597, the package needs to be formed into transport packets according to NTD.

The uld (linkage stack) — according to GOST 7566.

Sec. 5. (Changed edition, Rev. N 2).

APP (mandatory). THE METHOD OF DETERMINING THE MASS FRACTION OF LEAD

APP
Mandatory

This methodology applies to steel, alloy lead, and sets polarographic method for the determination of the mass fraction of lead (with a mass fraction of lead from 0.05 to 0.50%).

1. THE ESSENCE OF THE METHOD

The method is based on polarography lead molar concentration of equivalent of hydrochloric acid 3 mol/DMat a potential of half-wave from minus 0.43-minus 0.45 V relative to the anode of mercury. The presence in the solution more than 1 mg of chromium, molybdenum and Nickel makes the polarographic wave is less clear and readable measurements. To eliminate the effects last chromium is oxidized to hexavalent perchloric acid, and lead is deposited on ferric hydroxide with ammonia. Molybdenum, Nickel and hexavalent chromium remain in the filtrate.

2. GENERAL REQUIREMENTS

2.1. General requirements for method of analysis according to GOST 28473.

The introductory part of sect. 1, 2. (Changed edition, Rev. N 2).

3. APPARATUS, REAGENTS AND SOLUTIONS

Polarograph electronic.

Hydrochloric acid according to GOST 3118, diluted 1:1 and 1:10.

Nitric acid according to GOST 4461.

Perchloric acid, a solution with a mass concentration of 0.57 g/cm.

Ammonia water according to GOST 3760.

Iron, the reduced hydrogen that do not contain lead.

Gelatin GOST 11293, freshly prepared solution with the mass concentration of 0.005 g/cm.

Standard solutions of lead.

Solution a is prepared as follows: 1 g SP.h. metallic lead is placed in a beaker and dissolved in 25−30 cmof nitric acid, diluted 1:1. Nitrogen oxides are removed by boiling the solution. Pour 5−10 cmof hydrochloric acid and the solution evaporated to obtain a wet salts. Operation of evaporation is repeated twice, each time priliva 5−10 cmof hydrochloric acid. Salt dissolved in 200−300 cmof hot water until dissolved, cool, dilute the solution in the volumetric flask up to 1 DMwith water and stirred. 1 cmof the solution contains 1 mg lead.

Solution B is prepared as follows: 10 cmof solution A is placed in a volumetric flask with a capacity of 100 cm, made up to the mark with water and mix. 1 cmof a solution contains 0.1 mg of lead.

4. ANALYSIS

A sample of steel weighing 1 g, with the mass fraction of lead to 0.3% and 0.5 g — at a mass fraction of more than 0.3% is placed in a conical flask with a capacity of 250 cm, respectively, poured 30−15 cmof hydrochloric acid diluted 1:1, heated to complete dissolution of the sample and oxidize a few drops of nitric acid until the termination of foaming solution.

Then pour 50 cmof solution with a mass concentration of 0.57 g/cmand the solution was evaporated until the appearance of fumes of perchloric acid, which allow to stand 2−3 min., the Flask is removed from heat, cool, dissolve salt in water and pour in a thin stream into another conical flask with a capacity of 500 cm, where pre-poured 100 cmof water and 80 cmof ammonia solution with a mass concentration of 0.25 g/cm. Solution to precipitate hydroxides of the metals is heated to boiling and filtered through a filter of medium density. Precipitate was washed 8−10 times with hot water and ammonia, if chromium is present more than 2 mg, make reprecipitation. For this purpose the precipitate from the filter washed with water in a flask, which produced the precipitation was dissolved in 50 cmof hydrochloric acid with a mass concentration of 0.57 g/cmand again evaporated until the appearance of fumes of perchloric acid. The flask is removed from heat, cool, dissolve salt in water and again precipitated hydroxide of the metals with ammonia, as described above. The washed precipitate hydroxides of the metals washed from the filter with water into the flask, which produces the precipitation, and dissolved in hydrochloric acid with a density of 1:1. The filter is washed with hydrochloric acid diluted 1:10, and washed with water. When the mass fraction in the sample the test sample of steel chromium, Nickel (1 mg each), molybdenum (up to 0.5 mg) a portion, as specified above, dissolved in 30 cmof hydrochloric acid diluted 1:1, and oxidized with a few drops of hydrogen peroxide. Further, while any method of decomposition the solutions were evaporated to 5−7 cmand poured into a volumetric flask with a capacity of 100 cm.

The conical flask is washed with 50 cmof water and pour the solution into the volumetric flask to the mark with hydrochloric acid diluted 1:1. The solution is mixed and part of it (20−30 cm) is poured into a dry glass with a capacity of 100 cm. In glass making at the tip of a spatula of iron, recovered with hydrogen, and stirred until discoloration (recovery of trivalent iron to divalent). The solution was passed through a dry filter fast filter in a Cup with a capacity of 50 cm, pour 3−4 drops of gelatin solution with mass concentration of 0.005 g/cm, stirred, placed in an electrolytic cell and polarographic when applied voltage minus 0,43−0,45 V (relative to the anode of mercury).

The calculation of the mass fraction of lead is produced by comparison with an appropriate amount of standard solution B, to which is added 1 g of iron, does not contain lead, which held through all the stages of analysis as described above.

The discrepancy between the heights of the polarographic waves of the test and the standard solution measured at the same sensitivity of the galvanometer should not be more than ±1 mm.

Sec. 3, 4.(Changed edition, Rev. N 2, 3).

5. PROCESSING OF THE RESULTS

5.1. Mass fraction of lead (a) percentage calculated by the formula

,

where the wave height of the sample, mm;

 — height of standard solution, mm;

 — the number of standard solution, mg;

 — the sensitivity of the galvanometer when polarographically standard solution;

 — the sensitivity of the galvanometer when polarography of the sample;

 — hanging,

Mass fraction of lead should be calculated accurate to two significant digits after the decimal point.

5.2. Valid discrepancies in the results of the analysis shall not exceed the values given in the table.

Mass fraction of lead, %	Allowable differences between the extreme results of the analysis %
From 0.05 to 0.10	0,020
SV. Of 0.10 «to 0.30	0,030
«To 0.30» to 0.50	0,040

(Changed edition, Rev. N 2).