GOST 5950-2000

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  ГОСТ 5950-2000

GOST 5950−2000 Bars, strips and reels of tool steel alloy. General specifications

GOST 5950−2000

Group В32

INTERSTATE STANDARD

BARS, STRIPS AND REELS OF TOOL STEEL ALLOY

General specifications

Tool alloy steel bars, strips and coils. General specifications

ISS 77.140.20
OKP 09 6105

Date of introduction 2002−01−01

Preface

1 DEVELOPED by the Technical Committee for standardization TC 6, the Ukrainian state scientific-research Institute of special steels, alloys and ferroalloys (Ukrniispetsstal)

SUBMITTED by the State Committee for standardization, Metrology and certification of Ukraine

2 ADOPTED by the Interstate Council for standardization, Metrology and certification (Protocol No. 17 dated June 22, 2000)

The adoption voted:

The name of the state	The name of the national authority for standardization
The Republic Of Belarus	Gosstandart Of The Republic Of Belarus
The Republic Of Kazakhstan	Gosstandart Of The Republic Of Kazakhstan
The Kyrgyz Republic	Kyrgyzstandard
Moldova	Moldova-Standard
Russian Federation	Gosstandart Of Russia
Turkmenistan	The MDCSU «Turkmenstandartlary"
Ukraine	Gosstandart Of Ukraine

3 Resolution of the State Committee of the Russian Federation on standardization and Metrology of June 4, 2001 No. 220-St inter-state standard GOST 5950−2000 introduced directly as state standard of the Russian Federation from January 1, 2002.

4 REPLACE GOST 5950−73

5 REISSUE

Amended, published in the IUS N 12, 2004, IUS N 7, 2012

The amendments made by the manufacturer of the database

1 Scope

This standard applies to hot-rolled rods, strips and coils, forged bars and strips, calibrated rods and coils, rods with special surface finish (further — products), tool steel alloy.

For steel grades 3KH2MNF, 4KHMNFS, 9ХФМ, ingots, blooms, slabs, billets, forgings, sheet, tape, pipe and other metal standard applies only in part of the rules of the chemical composition.

2 Normative references

The present standard features references to the following standards:

GOST 1051−73 rental calibrated. General specifications

GOST 1133−71 forged round Steel and square. Assortment

GOST 1763−68 (ISO 3887−77) Steel. Methods for determining the depth bezoperatsionnogo layer

GOST 1778−70 (ISO 4967−79) Steel. Metallographic methods of determination of nonmetallic inclusions

GOST 2590−88* hot-rolled steel round. Assortment
________________
* On the territory of the Russian Federation the document is not valid. Standards 2590−2006, here and hereafter. — Note the manufacturer’s database.

GOST 2591−88* hot-rolled steel square. Assortment
________________
* On the territory of the Russian Federation the document is not valid. Standards 2591−2006, here and hereafter. — Note the manufacturer’s database.

GOST 4405−75 Strip hot-rolled and wrought tool steel. Assortment

GOST 5639−82 of Steel and alloys. Methods of detection and determination of grain size

GOST 7417−75 calibrated round Steel. Assortment

GOST 7565−81 (ISO 377−2-89) Iron, steel and alloys. Sampling method for determination of chemical composition

GOST 7566−94 metal Products. Acceptance, marking, packing, transportation and storage

GOST 8233−56 Steel. The standards of the microstructure

GOST 8559−75 calibrated square Steel. Assortment

GOST 8560−78 calibrated hexahedronal rolled-stock. Assortment

GOST 9012−59 (ISO 410−82, ISO 6506−81) Metals. Method of measuring hardness Brinell hardness

GOST 9013−59 (ISO 6508−86) Metals. Method of measuring Rockwell hardness

GOST 10243−75 Steel. Test method and evaluation of the macrostructure

GOST 12344−2003 Steel alloyed and high alloy. Methods for determination of carbon

GOST 12345−2001 (ISO 671−82, ISO 4935−89) Steel alloyed and high alloy. Methods of determining sulphur

GOST 12346−78 (ISO 439−82, ISO 4829−1-86) Steel alloyed and high alloy. Methods for determination of silicon

GOST 12347−77 Steel alloyed and high alloy. Methods for determination of phosphorus

GOST 12348−78 (ISO 629−82) Steel alloyed and high alloy. Methods for determination of manganese

GOST 12349−83 Steel alloyed and high alloy. Methods for determination of tungsten

GOST 12350−78 Steel alloyed and high alloy. Methods for determination of chromium

GOST 12351−2003 Steel alloyed and high alloy. Methods for determination of vanadium

GOST 12352−81 Steel alloyed and high alloy. Methods for determination of Nickel

GOST 12354−81 Steel alloyed and high alloy. Methods for determination of molybdenum

GOST 12355−78 Steel alloyed and high alloy. Methods for determination of copper

GOST 12356−81 Steel alloyed and high alloy. Methods for determination of titanium

GOST 12361−2002 Steel alloyed and high alloy. Methods for determination of niobium

GOST 14955−77 quality round Steel with special surface finish. Specifications

GOST 18895−97 Steel. Method of photoelectric spectral analysis

GOST 26877−91 metal Products. Methods of measuring form deviations of

GOST 28033−89 Steel. Method x-ray fluorescence analysis

GOST 28473−90 Iron, steel, ferroalloys, chromium and manganese metal. General requirements for methods of analysis

3 Classification, basic parameters and dimensions

3.1 Classification

Metal products are divided as follows:

— for appointment depending on the grade of steel — into two groups (Annex A):

I — for the manufacture of tools used primarily for processing metals and other materials in cold condition;

II — for the manufacture of tools used in the remainder of consumers for processing of metals by pressure at temperatures above 300 °C;

according to the method of further processing of hot-rolled and forged metal products in groups I and II are divided into subgroups:

and for the hot forming (including precipitation, landing) and also for cold drawn — without the control of the structural characteristics;

b — for cold mechanical processing (turning, planing, milling, etc.) with full scope of tests;

— the quality and surface finish of metal products are divided as follows:

hot rolled and forged:

2ГП — subgroup of a;

3ГП — subgroup b high quality;

4ГП — subgroup b of normal quality;

calibrated — B and C;

with special surface finishing — In, G, D.

Designation surface finish indicate in the order.

3.2 Brand

3.2.1 Brand and chemical composition of the steel at plavonia analysis must conform to table 1.

Table 1

Steel grade	Mass fraction of element, %
	carbon	silicon	manganese	chrome	tungsten		vanadium	molybdenum		Nickel
Group I
13KH	1,25−1,40	0,10−0,40	0,15−0,45	0,40−0,70	-	-		-	-
8KHF	0,70−0,80	0,10−0,40	0,15−0,45	0,40−0,70	-	0,15−0,30		-	-
9KHF	0,80−0,90	0,10−0,40	0,30−0,60	0,40−0,70	-	0,15−0,30		-	-
11KHF (11X)	Of 1.05−1.15	0,10−0,40	0,40−0,70	0,40−0,70	-	0,15−0,30		-	-
9ХФМ	0,80−0,90	0,10−0,40	0,30−0,60	0,40−0,70	-	0,15−0,30		0,15−0,25	-
X	0,95−1,10	0,10−0,40	0,15−0,45	1,30−1,65	-	-		-	-
9KH1	0,80−0,95	0,25−0,45	0,15−0,45	1,40−1,70	-	-		-	-
12X1 (120X, ЭП430)	1,15−1,25	0,10−0,40	0,30−0,60	1,30−1,65	-	-		-	-
6KHS	0,60−0,70	0,60−1,00	0,15−0,45	1,00−1,30	-	-		-	-
9G2F	0,85−0,95	0,10−0,40	1,70−2,20	-	-	0,10−0,30		-	-
9KHVG	0,85−0,95	0,10−0,40	0,90−1,20	0,50−0,80	0,50−0,80	-		-	-
6KHVG	0,55−0,70	0,10−0,40	0,90−1,20	0,50−0,80	0,50−0,80	-		-	-
9KHS	0,85−0,95	1,20−1,60	0,30−0,60	0,95−1,25	-	-		-	-
V2F	1,05−1,22	0,10−0,40	0,15−0,45	0,20−0,40	1,60−2,00	0,15−0,30		-	-
CHC	0,95−1,05	0,40−0,70	0,85−1,25	1,30−1,65	-	-		-	-
4KHS	0,35−0,45	1,20−1,60	0,15−0,45	1,30−1,60	-	-		-	-
KHVSGF	0,95−1,05	0,65−1,00	0,60−0,90	0,60−1,10	0,50−0,80	0,05−0,15		-	-
CVH	0,90-of 1.05	0,10−0,40	0,80−1,10	0,90−1,20	1,20−1,60	-		-	-
6KHV2S	0,55−0,65	0,50−0,80	0,15−0,45	1,00−1,30	2,20−2,70	-		-	-
5KHV2SF	0,45−0,55	0,80−1,10	0,15−0,45	0,90−1,20	1,80−2,30	0,15−0,30		-	-
6KH3MFS (ЭП788)	0,55−0,62	0,35−0,65	0,20−0,60	2,60−3,30	-	0,30−0,60		0,20−0,50	-
7KHG2VMF	0,68−0,76	0,10−0,40	1,80−2,30	1,50−1,80	0,55−0,90	0,10−0,25		0,50−0,80	-
9KH5VF	0,85−1,00	0,10−0,40	0,15−0,45	4,50−5,50	0,80−1,20	0,15−0,30		-	-
8KH6NFT (85Х6НФТ)	0,80−0,90	0,10−0,40	0,15−0,45	5,00−6,00	-	0,30−0,50		-	0,90−1,30, titanium 0,05−0,15
6KH4M2FS (ДИ55)	0,57−0,65	0,70−1,00	0,15−0,45	3,80−4,40	-	0,40−0,60		2,00−2,40	-
KH6VF	Of 1.05−1.15	0,10−0,40	0,15−0,45	5,50−6,50	1,10−1,50	0,50−0,80		-	-
8KH4V2MFS2 (ЭП761)	0,80−0,90	1,70−2,00	0,20−0,50	4,50−5,10	1,80−2,30	1,10−1,40		0,80−1,10	-
11KH4V2MF3S2 (ДИ37)	Of 1.05−1.15	1,40−1,80	0,20−0,50	3,50−4,20	2,00−2,70	2,30−2,80		0,30−0,50	Not more than 0.40
6KH6V3MFS (55Х6В3СМФ, ЭП569)	0.50 to 0.60	0,60−0,90	0,15−0,45	5,50−6,50	2,50−3,20	0,50−0,80		0,60−0,90	-
X12	2,00−2,20	0,10−0,40	0,15−0,45	11,50−13,00	-	-		-	-
KH12MF	1,45-of 1.65	0,10−0,40	0,15−0,45	11,00−12,50	-	0,15−0,30		0,40−0,60	-
KH12F1	1,25−1,45	0,10−0,40	0,15−0,45	11,00−12,50	-	0,70−0,90		-	-
KH12VMF	2,00−2,20	0,10−0,40	0,15−0,45	11,00−12,50	0,50−0,80	0,15−0,30		0,60−0,90	-
Group II
5KHNM	0.50 to 0.60	0,10−0,40	0,50−0,80	0,50−0,80	-	-		0,15−0,30	1,40−1,80
5KHNV	0.50 to 0.60	0,10−0,40	0,50−0,80	0,50−0,80	0,40−0,70	-		-	1,40−1,80
5KHNVS	0.50 to 0.60	0,60−0,90	0,30−0,60	1,30−1,60	0,40−0,70	-		-	0,80−1,20
7X3	Of 0.65−0.75	0,10−0,40	0,15−0,45	3,20−3,80	-	-		-	-
8X3	0,75−0,85	0,10−0,40	0,15−0,45	3,20−3,80	-	-		-	-
4KHMFS (40ХСМФ)	0,37−0,45	0,50−0,80	0,50−0,80	1,50−1,80	-	0,30−0,50		0,90−1,20	-
4KHMNFS	0,35−0,45	0,70−1,00	0,15−0,45	1,25-of 1.55	-	0,35−0,50		0,65−0,85	1,20−1,60
3KH2MNF	0,27−0,33	0,10−0,40	0,30−0,60	2,00−2,50	-	0,25−0,40		0,40−0,60	1,20−1,60
5KH2MNF (ДИ32)	0,46−0,53	0,10−0,40	0,40−0,70	1,50−2,00	-	0,30−0,50		0,80−1,10	1,20−1,60
4KH3VMF (3И2)	0,40−0,48	0,60−0,90	0,30−0,60	2,80−3,50	0,60−1,00	0,60−0,90		0,40−0,60	-
3KH3M3F	0,27−0,34	0,10−0,40	0,20−0,50	2,80−3,50	-	0,40−0,60		2,50−3,00	-
4H5MFS	0,32−0,40	0,90−1,20	0,20−0,50	4,50−5,50	-	0,30−0,50		1,20−1,50	-
4KH4VMFS (ДИ22)	0,37−0,44	0,60−1,00	0,20−0,50	3,20−4,00	0,80−1,20	0,60−0,90		1,20−1,50	-
4KH5MF1S (ЭП572)	0,37−0,44	0,90−1,20	0,20−0,50	4,50−5,50	-	0,80−1,10		1,20−1,50	-
4KH5V2FS (ЭИ958)	0,35−0,45	0,80−1,20	0,15−0,45	4,50−5,50	1,60−2,20	0,60−0,90		-	-
4KH2V5MF (ЭИ959)	0,30−0,40	0,10−0,40	0,10−0,45	2,20−3,00	4,50−5,50	0,60−0,90		0,60−0,90	-
5KH3V3MFS (DI23)	0,45−0,52	0,50−0,80	0,20−0,50	2,50−3,20	3,00−3,60	1,50−1,80		0,80−1,10	Niobium 0,05−0,15
05KH12N6D2MFSGT (ДИ80)	0,01−0,08	0,60−1,20	0,20−1,20	11,50−13,50	-	0,20−0,50		0,20−0,40, copper 1,40−2,20	5,50−6,50, titanium 0,40−0,80
Note — In the designation marks the first digits indicates the mass fraction of carbon in tenths of a percent. They can be omitted if the mass fraction of carbon is close to unity or greater than unity. Letters indicate: G — manganese, — silicon, — chromium, — tungsten, f — vanadium, Ni is Nickel, M is molybdenum, D — copper, T — titanium. The figures after the letters indicate the average mass fraction of the respective alloying element in integer units of percent. The lack of numbers means that the mass fraction of this alloying element is approximately equal to 1%. In some cases, the mass fraction of these alloying elements is not specified, if it does not exceed 1.8%.

3.2.1.1 Mass fraction of sulfur and phosphorus in the steel shall not exceed 0,030% (of each element).

3.2.1.2 steel brand 4KHMNFS introduced for the calculation of 0.05% zirconium and 0.003% boron.

In steel brand 05KH12N6D2MFSGT introduced for the calculation of magnesium and calcium of 0.03% of each element and 0.015% zirconium.

The items you enter on the calculation, chemical analysis is not defined.

3.2.1.3 residual Mass fraction of Nickel in steel of all types, not alloyed with Nickel, is allowed to 0.40%, in steel grade 4KH4VMFS — to 0.60%.

3.2.1.4 Mass fraction of residual copper in the steel shall not exceed 0.30 percent.

3.2.1.5 permitted the manufacture of tungsten-containing steels with residual molybdenum to 0.30% (mass fraction of tungsten in steel to 3.00%) and 0.50% (with mass fraction of tungsten in steel in excess of 3.00%) compliance with all other requirements of this standard.

3.2.1.6 In steel, not alloy with tungsten, vanadium, molybdenum and titanium, is allowed the mass fraction of tungsten and molybdenum to 0.20% of each of vanadium, up to 0.15% and titanium up to 0.03%.

3.2.1.7 In tungsten-containing steels allowed the partial replacement of tungsten with molybdenum at the rate of one mass fraction of tungsten is equivalent to one mass fraction of molybdenum.

The number of replaceable tungsten in steels with a mass fraction of tungsten up to 1.5% should be not more than 0.1%, in the steels with a mass fraction of tungsten of more than 1.5% not more than 0.2%.

Total mass fraction of tungsten and molybdenum should be in the range of mass fraction of tungsten.

3.2.1.8 In molybdenum steels allowed the partial replacement of molybdenum with tungsten at the rate of one mass fraction of molybdenum is equivalent to two weight fractions of tungsten.

The model number of molybdenum in steels with a mass fraction of molybdenum to 1.2% inclusive shall be not more than 0.1%, in the steels with a mass fraction of molybdenum of more than 1.2% not more than 0.2%.

Total mass fraction of tungsten, calculated for molybdenum and molybdenum should be in the range of mass fraction of molybdenum.

With the exception of steel grades 5KHNM and 5KH2MNF. The minimum mass fraction of molybdenum in steel 5KHNM should be of 0.10%. Total mass fraction of molybdenum and tungsten, calculated for molybdenum should be in the range of 0.15% to 0.30%. The minimum mass fraction of molybdenum in steel grade 5KH2MNF shall be 0.40 percent. Total mass fraction of molybdenum and tungsten, calculated for molybdenum should be in the range from 0.80% to 1.20%. When the mass fraction of tungsten 0.20%, the steel must be labeled 5KH2VMNF.

3.2.2 In ready rental, ingots, blooms, slabs, billets, forgings and products further processing permitted deviation in chemical composition from the rules of table 1 in accordance with table 2.

Table 2

The name of the element	The mass fraction of the element in the grade of steel for plavonia analysis, %	Tolerance, %
Carbon	To 0.60 incl.	±0,01
	SV. 0,60	±0,02
Silicon	To 1.00 incl.	±0,02
	SV. Of 1.00	±0,05
Manganese	To 1.00 incl.	±0,02
	SV. Of 1.00	±0,05
Chrome	To 1.00 incl.	±0,02
	SV. Of 1.00 «to 4.00"	±0,05
	«Of 4.00	±0,10
Tungsten	To 2.50 incl.	±0,05
	SV. 2,50	±0,10
Molybdenum	To 1.00 incl.	±0,02
	SV. Of 1.00	±0,05
Nickel	Table 1	±0,05
Niobium	Table 1	±0,01
Vanadium	To 0.60 incl.	±0,02
	SV. 0,60	±0,05
Copper	SV. Of 1.00	±0,05
Titan	Table 1	±0,02
Sulfur	-	+0,005
Phosphorus	-	+0,005

3.3 Assortment

3.3.1 metal Products are made in the form of bars, round and square sections, strips and coils.

3.3.2 shape, dimensions and limit deviations of the steel products should meet the requirements:

— forged round and square sections — GOST 1133;

hot — rolled round section, GOST 2590;

— hot rolled square section — GOST 2591 and other regulatory documents;

— strip — GOST 4405;

— calibrated GOST 7417, 8559 GOST, GOST 8560 kvalitetom of h11 and h12;

— with special surface finish GOST 14955 kvalitetom of h11 and h12.

Examples of symbols

Bar hot rolled round, the usual accuracy of rolling (B) of class I curvature, of random length (ND), with a diameter of 80 mm according to GOST 2590−88, steel stamps 9KHS, subgroups a, surface quality 2ГП:

Round In-I-ND-80 GOST 2590−88/9KHS-a-2ГП GOST 5950−2000

The rod is grooved, round, with extreme variances h11, length (MD), with a diameter of 20 mm according to GOST 7417−75, steel khvg, group of quality surface © the churchyard 1051−73:

Round h11-MD-20 GOST 7417−75/CVH-GOST 5950−2000

Strip forged, standard length (CBM), thickness 40 mm, width 60 mm according to GOST 4405−75, of steel grade 7KHG2VMF, subgroup b, of the surface 4ГП:

Stripe MD-4060 GOST 4405−75/7KHG2VMF-b-4ГП GOST 5950−2000

4 General technical requirements

4.1 characteristics of basic performance

4.1.1 delivery Status

4.1.1.1 metal Products manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

4.1.1.2 Steel produce thermally processed (after annealing or high tempering). Metal products of steel grades 11KHF, 13X, 9KH1, X, 12X1, 9KHS, V2 °F, CHC, 9KHVG, CVH, KHVSGF for cutting tools made of annealed (FROM).

The purpose specified in the order.

4.1.1.3 the ends of the rods and strips need to be trimmed or cut without burrs and shavings. The length of the folded ends should not exceed:

1.5 diameter or thickness for steel products of diameter or thickness up to 10 mm;

— 40 mm for steel diameter or thickness over 10 up to 60 mm;

— 60 mm for steel diameter or thickness of over 60 mm.

4.1.2 Properties

4.1.2.1 Hardness of steel products of all grades of steel intended for hot forming and cold drawing (subgroup a), with the exception of steel products of steel grade 05KH12N6D2MFSGT, should be no more than 255 HB (indentation diameter not less than 3.8 mm).

The hardness of steel products of steel grade 05KH12N6D2MFSGT should be no more than 293 HB (indentation diameter not less than 3.5 mm).

Hardness in the delivery condition of steel, intended for cold mechanical processing (subgroup b), shall be as defined in table 3.

Table 3

Steel grade	Hardness HB, no more	Indentation diameter, mm, not less
13KH	248	3,85
8KHF	241	3,9
9KHF	241	3,9
11KHF (11X)	229	4,0
X	229	4,0
9KH1	229	4,0
12X1	241	3,9
6KHS	229	4,0
9G2F	229	4,0
9KHVG	241	3,9
6KHVG	217	4,1
9KHS	241	3,9
V2F	229	4,0
CHC	241	3,9
4KHS	217	4,1
KHVSGF	241	3,9
CVH	255	3,8
6KHV2S	255	3,8
5KHV2SF	229	4,0
6KH3MFS	241	3,9
7KHG2VMF	255	3,8
9KH5VF	241	3,9
8KH6NFT	241	3,9
6KH4M2FS	255	3,8
KH6VF	241	3,9
8KH4V2MFS2	255	3,8
11KH4V2MF3S2	255	3,8
6KH6V3MFS	255	3,8
X12	255	3,8
KH12MF	255	3,8
KH12F1	255	3,8
KH12VMF	255	3,8
5KHNM	241	3,9
5KHNV	255	3,8
5KHNVS	255	3,8
7X3	229	4,0
8X3	241	3,9
4KHMFS	241	3,9
5KH2MNF	255	3,8
4KH3VMF	241	3,9
3KH3M3F	229	4,0
4H5MFS	241	3,9
4KH4VMFS	241	3,9
4KH5MF1S	241	3,9
4KH5V2FS	241	3,9
4KH2V5MF	241	3,9
5KH3V3MFS	241	3,9
05KH12N6D2MFSGT	293	3,5

For steel of steel grade 05KH12N6D2MFSGT subgroups a and b hardness values are not a rejection until 2003, but recorded in the document about quality.

4.1.2.2 the Hardness of samples of steel after quenching and tempering with the release must comply with the table 4.

Table 4

Steel grade	Temperature, °C, and quenching the samples	Temperature vacation, °C	Hardness HRC not less than
13KH	790−810, water	180	61
8KHF	820−840 oil	180	58
11KHF	810−830, oil	-	63
X	830−850 oil	180	60
9KH1	820−850, oil	-	63
12X1	850−870, oil	-	63
9G2F	780−800, oil	180	60
9KHVG	820−840 oil	-	63
9KHS	840−860 oil	-	63
V2F	820−840, water	180	60
CHC	820−860, oil	-	63
KHVSGF	840−860 oil	-	63
CVH	820−840 oil	180	61
5KHV2SF	900−920, oil	180	56
X12	960−980, oil	180	62
KH12MF	960−980, oil	180	61
KH12VMF	1010−1030, oil	180	61
5KHNM	840−860 oil	550	36
5KH2MNF	960−980, oil	550	45
3KH3M3F	1030−1050, oil	550	46
4H5MFS	1010−1030, oil	550	48
4KH4VMFS	1050−1070, oil	550	50
4KH5MF1S	1020−1040, oil	550	48
5KH3V3MFS	1120−1140, oil	550	50
Notes 1 variations in the temperature table of the leave shall not exceed ±10 °C. 2 hardness Values after hardening, the steel samples of the other brands are given in Appendix B. Hardness values after quenching and tempering depending on the temperature of the leave are given in Appendix B.

4.1.3 surface Condition of steel

4.1.3.1 Depth bezoperatsionnogo layer (ferrite + transition zone) hot rolled and forged steel products should not exceed the side (counting from the actual size):

— 0.35 mm — for steel products of diameter or thickness 4 to 8 mm;

— 0.4 mm — for steel products of diameter or thickness St… 8 to 15 mm;

— 0,5 mm — for steel products of diameter or thickness of St. 15 to 30 mm;

— 0.7 mm for steel diameter or thickness of over 30 to 50 mm;

— 1.0 mm — for steel products of diameter or thickness over 50 mm up to 70 mm;

— 1.3 mm — for steel products of diameter or thickness over 70 mm to 100 mm.

Depth bezoperatsionnogo layer of grooved steel products shall not exceed per side:

— 1.5% of the actual diameter or thickness for steel products of steel containing up to 0.5% silicon, up to 1.0% molybdenum;

— 2,0% of the actual diameter or thickness for steel products of steel containing St. 0.5% silicon or St. 1.0% molybdenum.

On the bars with special surface finish obesplozhennym layer is not allowed.

4.1.3.2 On the surface of steel products of the group surface quality 2ГП should not be cracked, sunsets, captured, rolled or uninhibited of bubbles and impurities.

Defects should be removed by gentle cutting or Stripping, the width of which shall not be less than five times the depth.

The depth of Stripping shall not exceed (counting from the actual size of the metal):

for bars with diameter or thickness less than 80 mm — half of the sum of limit deviations of the size;

for bars with diameter or thickness from 80 to 140 mm — the sum of limit deviations of the size;

— for bars with section size 140 mm — 5% nominal size (diameter or thickness);

— for the bands — the sum of limit deviations on size.

In one section is allowed no more than two sweeps.

Allowed without Stripping some minor scratches, fingerprints, Rabina and other defects of a mechanical origin to a depth not exceeding half the amount of the limit deviations on size.

On the surface of hot-rolled coils allowed without Stripping some small slivers, rolled out impurities and bubbles, defects of mechanical origin (fingerprints, scratches, risks, Rabisha, etc.) not exceeding 0,25 of total limit deviation, counting of the actual size.

4.1.3.3 On the surface of steel quality groups surface 3ГП and 4ГП allowed local defects, the depth of which shall not exceed half of the sum of the limit deviations on size, for metal, diameter or thickness that is less than 80 mm; the sum of the limit deviations on size, for metal, diameter or thickness of which is 80 mm or more.

For steel products of the group surface quality 3ГП the depth of the defects I think from the nominal size, group 4ГП from valid.

4.1.3.4 Surface grooved steel products shall conform to the requirements of the group In GOST 1051, grooved brushed band B GOST 1051, with special surface treatment — groups b, G, D GOST 14955.

4.1.4 Structural characteristics

4.1.4.1 the Macrostructure of steel products in the control of the etched templeto should not have podnasadochnogo looseness, blistering, delamination, cracks, inclusions, cavities and placenow.

Admitted defects of the macrostructure shown in table 5.

Table 5

The permissible defects of the macrostructure	Points, no more than
Pousada liquation	1
Exudation square	1
Central porosity	2
Spotty liquation	2
Point heterogeneity	3
Increased travelmasti axial zone (for metal continuous casting)	2

4.1.4.2 the Microstructure of hot rolled, forged metal products subgroup b, and calibrated with special surface finish steel grades 11KHF, 13X, 9KH1, X, 12X1, 9KHS, V2 °F, CHC, 9KHVG, KHVSGF, CVH, 8KHF and 9G2 °F diameter or thickness up to 60 mm must meet:

granular pearlite — points from 1 to 6 (Annex G);

— the remains of a carbide mesh steel grades 11KHF, 9KH1, X, 9KHS, V2 °F, CHC, 9KHVG, KHVSGF should not exceed the score of 3, steel grade 12X1 — 4, 13X steel grades and CVH — 3 or 4 (Annex G). Score carbide mesh point in order for the steel products of steel grades 13X and CVH.

4.1.4.3 Carbide heterogeneity of steel grades 9KH5VF, 8KH6NFT, 8KH4V2MFS2, KH6VF, X12, KH12VMF, KH12MF, KH12F1, 6KH6V3MFS, 11KH4V2MF3S2, 6KH4M2FS (annexes D, E) shall not exceed, depending on the size of the steel, the limits specified in table 6.

Table 6

The diameter or thickness of metal, mm					The maximum permissible rate of carbide heterogeneity, grade, for steel grades
9KH5VF, 8KH6NFT, 8KH4V2MFS2, KH6VF, 6KH6V3MFS, 6KH4M2FS, 11KH4V2MF3S2	X12, KH12MF, KH12F1, KH12VMF
To	40	incl.	3	4
SV.	40	«	60	«	4	5
«	60	«	80	«	5	6
«	80	«	100	«	6	7

4.1.4.4 grain Size of austenite in steel for metal products subgroup b, depending on the size, must comply with table 7.

Table 7

The appointment group	Steel grade	The diameter or thickness of metal, mm	Grain size of austenite in hardened samples, not larger rooms
			the churchyard 5639	on a scale fractures (app)
I	6KHS, 6KHVG, 4KHS, 6KHV2S, 5KHV2SF, 6KH3MFS, 7KHG2VMF, 6KH4M2FS, KH6VF, 8KH4V2MFS2, 11KH4V2MF3S2, 6KH6V3MFS, X12, KH12MF, KH12F1, KH12VMF	Up to 80 incl. SV. 80 «140"	9 8	4 3
II	All steel grades	Up to 80 incl.	8	3
		SV. 80 «140 «	6	2

4.1.4.5 Norm structural characteristics: perlite, carbide mesh, carbide inhomogeneity, the grain size of austenite for the stripes shall conform to the standards for bars of square cross-section with equal cross-sectional area.

4.2 Characteristics established by agreement between manufacturer and consumer

4.2.1 Production of steel by electroslag remelting with a mass fraction of sulfur, not more than 0,015%.

4.2.2 Mass fraction of manganese from 0.15% to 0.60% (for plavonia analysis) in steel grades X12, KH12VMF, KH12MF, KH12F1.

4.2.3 steel Products of steel grade KH12VMF without tungsten and brands 6KH3MFS without molybdenum. In this case, the steel is denoted respectively Х12М1Ф and 6Х3ФС.

4.2.4 Narrowed the limits of the mass fractions of individual elements in comparison with table 1. Norms are stipulated in the order.

4.2.5 Mass fraction (for plavonia analysis) is not more than: sulfur and phosphorus 0,020% of each element, Nickel — 0,20% in steel grades 8KHF, 9KHF, V2 °F.

4.2.6 steel Products of steel grades 8KHF, 9KHF and 11KHF without vanadium. In this case, the steel is denoted, respectively, 8X, 9X, 11X.

4.2.7 Mass fraction of carbon from 0.78% to 0.92 per cent chromium and from 1.4% to 1.9% (for plavonia analysis) steel grade 9KH1.

4.2.8 Depth bezoperatsionnogo layer to the metal after annealing in furnaces without protective atmosphere. The rules establish by the agreement.

4.2.9 the Hardness of steel products of steel grades 8KHF, 9KHF, 6KH3MFS after annealing or high vacation not higher than 217 HB (indentation diameter not less than 4.1 mm).

4.2.10 Control of granular pearlite and carbide mesh for steel products of diameter or thickness over 60 mm for steel grades specified in 4.1.4.2. The rules establish by the agreement.

4.2.11 the Norm of granular perlite from 1 to 7 points for steel products of diameter or thickness up to 60 mm of steel grade 9KHS.

4.2.12 Control carbide inhomogeneity steel grades 11KHF, 13X, 9KH1, X, 12X1, 9KHS, V2 °F, CHC, 9KHVG, CVH, KHVSGF on a scale 6A GOST 8233. The rules establish by the agreement.

4.2.13 Carbide heterogeneity of steel grades 9KH5VF, 11KH4V2MF3S2, 6KH4M2FS 1 grade lower in the limits specified in table 6.

4.2.14 Control of non-metallic inclusions in all steel grades. Admissible standards of pollution steel non-metallic inclusions shall conform to table 8 or be established by agreement of the parties.

Table 8

Method of smelting	The diameter or thickness of metal, mm	Non-metallic inclusions, points, no more
		Oxides	Sulfides	Nitrides	Silicates
Open smelting	To 40 incl.	3	2,5	3	3
	SV. 40	4	3	3,5	4
Electroslag remelting	To 40 incl.	1,5	1	1	1,5
	SV. 40	2,5	2	2	2,5

4.2.15 Hardness after hardening with the release of the samples of steel grades not listed in table 4. The rules establish by the agreement.

4.3 Labeling, packaging

4.3.1 General rules of marking — GOST 7566. Steel obtained by electroslag remelting, additionally marked by the letter W with a hyphen in the grade of steel, for example 3KH3M3F-sh.

Bars with a diameter or thickness greater than 50 mm is subjected to 100% condom branding.

4.3.2 Packaging of hot-rolled and forged steel products should be carried out in accordance with the requirements of GOST 7566.

Packaging of metal products with special surface finish — GOST 14955, calibrated — according to GOST 1051.

5 acceptance Rules

5.1 the Products are taken by parties consisting of rods, strips or coils of one melting, one subgroup of the same size, one surface and one treatment.

Each batch of steel must be accompanied by a quality document completed in accordance with the requirements of GOST 7566.

5.2 To check the chemical composition of one sample taken from the melt; from the party of bars, strips or coils — one rod, one strip or a coil.

5.3 For checking the size of selected 10% of bars, strips, or coils from the party.

5.4 To test the hardness in the delivery state select:

from bars with diameter or thickness up to 30 mm — two bars from a 1 ton, but not less than six bars from the party;

from bars with diameter or thickness greater than 30 mm — 5% of the bars from the party, but not less than five rods;

from strips and coils or two bands or two rolls from 1 ton, but not less than five from the party.

5.5 To test the hardness after quenching or tempering with the release of take one rod, one strip or one skein of the party, but at least two from the melting.

5.6 surface Quality check on all bars, strips and coils party.

5.7 To check the depth of the layer bezoperatsionnogo take two rods, two strips, or two rolls from the party.

5.8 To check the macrostructure take two rods, two strips, or two rolls from the party.

5.9 To check the microstructure (granular pearlite, carbide mesh, carbide inhomogeneity, grain size of the austenite) take two rods, two strips, or two rolls from the party.

5.10 For testing of non-metallic inclusions are selected two rods, two strips, or two rolls from the party, but at least six samples.

5.11 If unsatisfactory test results of at least one of the indicators (except size and placenow) re-testing is carried out according to GOST 7566.

In case of detection placenow party does not accept, and the inconsistency of the size of the party subjected to 100% sorting.

5.12 Macrostructure, carbide inhomogeneity, grain size of austenite, the hardness of steel products of diameter or thickness up to 40 mm provided by the manufacturing technology. These characteristics are not controlled, and guaranteed.

6 Methods to control

6.1 Sampling for determining the chemical composition of steel according to GOST 7565. Chemical analysis of steel — GOST 12344 — GOST 12352, 12354 series GOST — GOST 12356, 12361 GOST, GOST 18895, 28033 GOST, GOST 28473 or other methods providing the required accuracy.

6.2 Dimensions and geometric tolerances, hot rolled, forged steel check universal measuring instruments or templates, and calibrated with special surface finish — micrometers and staples according to GOST 26877.

6.3 For test on 5.4, 5.5, 5.7−5.10 for each selected unit of metal cut off one sample.

6.4 Hardness of the annealed metal or vysokoopasnye check with GOST 9012 after removing bezoperatsionnogo layer.

The test should be carried out along the length of the rod, strip or coil at a distance of not less than 100 mm from the end.

The number of prints should be at least three, each value of hardness must correspond to those in table 3.

6.5 Hardness after quenching or tempering with the release test according to GOST 9013 on the samples quenched or quenched and tempered from the optimal temperature shown in table 4.

The number of dimensions should not be less than three, and the first measurement is not taken into account.

The shape and dimensions of samples are the same as for the control of grain size of austenite.

6.6 Depth bezoperatsionnogo layer of metal is determined according to GOST 1763. Rolled with special surface finish is allowed to control method of thermoelectric power.

In the event of a dispute between consumer and manufacturer depth control bezoperatsionnogo layer should be carried out by the method M.

Note — the Depth bezoperatsionnogo layer strips should be measured along the wide side.

6.7 surface Quality of steel products test without the use of magnifying devices; in case of necessity conducted a sweep surface (rings or snake).

6.8 Macrostructure of metal must be checked for stained templeto without the use of magnifying devices with GOST 10243.

Allowed the results of the control of macrostructure in the major profiles of steel products to distribute to smaller profiles of the same heat. Increased travelmasti is evaluated on a scale for the assessment podsadecki segregation.

For bars and strips with a diameter or thickness 140 mm SV allowed samples to turn in a circle or square with a diameter or thickness from 90 to 140 mm.

Control of the flocs may be performed in the as-delivered profile.

Allowed to control the flocs in the workpiece.

6.9 Microstructure of steel products evaluated:

— perlite — scale N 1 in accordance with annexes G and K;

carbide grid — scale N 4 in accordance with appendices F and K.

6.10 Carbide heterogeneity of steel grades X12, KH12VMF, KH12MF, KH12F1 is rated on a scale N 2 in accordance with annexes D and K; steel grades 9KH5VF, 8KH6NFT, KH6VF, 6KH6V3MFS, 6KH4M2FS, 11KH4V2MF3S2, 8KH4V2MFS2 — scale N 3 in accordance with annexes E and K.

6.11 the grain Size of austenite is allowed to control the microstructure or fracture.

To obtain the fracture of the sample scored one or two sides, then break off. Control of grain size of austenite on the fracture conduct inspection without the use of magnifying devices by comparing the sample with standards of scale N 5 of Annex I. According to the shape and dimensions of the samples should meet the requirements of GOST 10243.

The grain size of austenite in the microstructure, determined on quenched samples, taken from the supplied profile. The scheme for sampling their shape and size to control the grain size of austenite in the microstructure is given in Appendix K.

Grain of austenite detected by the etching of grain boundaries. Control of grain size of austenite is carried out according to GOST 5639.

6.12 Control of non-metallic inclusions is carried out according to GOST 1778 on the longitudinal sections by the method of SH1 or Ш4 (comparison with the reference scales). Control method choose by agreement with the consumer.

6.13 permitted to use statistical and non-destructive testing methods according to regulatory documents.

If there are differences in applied methods of control regulated by this standard.

7 Transportation and storage

7.1 Transportation and storage of steel products shall conform to the requirements of GOST 7566.

7.2 Calibrated with special surface finish steel products must be stored in closed warehouses.

8 manufacturer’s Warranty

The manufacturer guarantees the conformity of steel products with the requirements of this standard, under the conditions of transportation and storage since leave it to the consumer.

Annex a (informative). Approximate appointment of alloy tool steels

APPENDIX A
(reference)

Approximate appointment of alloy tool steels of different grades are shown in table A. 1.

Table A. 1

Steel grade	Scope
Group I
13KH	For razor knives and blades, sharp surgical tools, scrapers, engraving tool
8KHF	For stamps when cold; knives during the cold cutting of metal; edging of matrices and punches in cold cutting burrs; center punches
9KHF	For gang, band, circular saws planer; stamps in cold work; knives during the cold cutting of metal; edging of matrices and punches in cold cutting burrs; center punches
11KHF	For taps and other cutting tools with diameter up to 30mm, hardened with cooling in hot environments
X	For chisels, used for notching of files; very solid eccentrics and Cams the fingers; the smooth cylindrical calibres and gauge rings; turning, planing and slotting cutters in a radial and repair shops
9KH1	Rolls for cold rolling, skin pass rolls, stamps, punches; cold heading dies and punches; woodworking tools
12X1	For measuring tools (tiles, gauges, templates)
6KHS	For pneumatic chisels and stamps of small size for cold forming; chipper knives
9G2F	For cutting and stamping tools (dies, taps, shear knives, measuring tools, moulds for pressing rubber and plastics)
9KHVG	For threaded gages, the patterns of complex shape, complex precision dies for cold work, which during hardening should not be subjected to significant volume changes and warping
6KHVG	For punches complex shapes in cold firmware mainly shaped holes in the sheet and strip material; small dies for hot stamping, mainly when you want minimal size change during hardening
9KHS	For drills, reamers, taps, dies, chasers, milling cutters, machine stamps, stamps for cold work
V2F	For band saws for metal and saw blade paintings
CHC	Rolls for cold rolling, cold heading dies and punches, blanking dies, small sizes (diameter or thickness up to 70 mm). Steel stamps CHC could not replace the steel grades of chronic viral hepatitis, 9KHS, KHVSGF in the manufacture of cutting tools
4KHS	For chisels, swages, scissors, in cold and hot metal cutting; dies for hot drawing
KHVSGF	For round dies, reamers and other cutting tools
CVH	For measuring and cutting tools, for which an increased shrinkage during hardening is unacceptable, threaded gauges, broaches, long tap, long reamers, dies and other special tools, cold heading dies and punches, tooling
6KHV2S, 5KHV2SF	For knives during the cold cutting of metal, thread rolling dies, punches and crimp matrix in cold work; woodworking instruments after prolonged use
6KH3MFS	For punches, working with high dynamic loads; cold heading dies, stamps, stamps; embossing stamps and some machinist’s tools (instead of 7X3 brands and 6KHV2S)
7KHG2VMF	Dies for cold volumetric deformation and blanking tool of complex configuration, used in the manufacture of products from non-ferrous alloys and low quality of structural steel
9KH5VF, 8KH6NFT	For knives used for cutting wood, planing saws and other woodworking tools of this type (e.g., solid cutters)
6KH4M2FS	For blanking and forming tools (dies, punches, pneumatic chisels, etc.), rolling tool
KH6VF	For thread rolling tools (rollers and dies), Hach saws, razors, matrices, punches, subanalytic and other tools, designed for cold deformation, for wood cutting milling tool
8KH4V2MFS2	For matrices of punches and dies of cold bulk deformation, with the process operating pressure up to 2300 MPa, thread rolling rollers
11KH4V2MF3S2	For blanking dies, including processing of cold rolled electrical steel Э412 and Э413 with coatings of type «Karlit»; of punches and dies of cold heading machines, punches and ejectors for cold extruding, operated with a specific pressure up to 2000 MPa in conditions of high wear and heating of working surfaces up to 400 °C; the spline and thread rolling tool
6KH6V3MFS	For thread rolling rollers, subhakanta, sleazenation, cut matrices, punches and other tools, intended for cold plastic deformation of metals of high hardness; knife Trabersruh machines, knives for guillotine shears for cutting high tensile steels and alloys; chipper knives used in woodworking; cutter for breaking rocks and other similar tools
X12, KH12VMF	For cold stamps high resistance to abrasion (mainly with working part rounded), not exposed to strong shocks and jolts; for die plates and dies, eyes for the calibration of metal rods under the thread rolling, bending and forming dies, complex dies sections body, which in the hardening should not be subjected to significant volume changes and warping; matrices and punches blanking and cutting dies; forming the active parts of electrical machines and electromagnetic systems, electrical machines
KH12MF, KH12F1	What brand for X12, but is required when high viscosity; rollers for forming complex shapes; sections of the different stamping dies complex forms; complex matrices dinoprostone in sheet metal forming, master gears, rolling dies, dies, matrices and punches blanking, cutting dies (including combined and sequential) with a complex configuration working parts; forming active parts of electrical machines
Group II
5KHNM	For hammer stamps vapor and pneumatic hammers weight of falling parts over 3 tons; press tools and dies high-speed stamping machine for hot deforming of light non-ferrous alloys; blocks of matrices for inserts horizontal machines
5KHNV, 5KHNVS	For hammer stamps vapor and pneumatic hammers weight of falling parts up to 3 ton
7X3, 8X3	For tools (punches, matrices), a hot landing fasteners and blanks made of carbon and low-alloy construction steels in the horizontal forging machines; parts of dies (dies, punches, ejectors) for hot pressing and extruding of these materials on crank presses with small-scale production; bending, trimming and cutting dies
4KHMFS	For hammer stamps vapor and pneumatic hammers weighing falling parts to 3 t during the deformation of alloyed steels and stainless steels (instead of less heat-resistant steel grades 5KHNM, 5KHNV); extrusion tools for aluminium alloys
5KH2MNF	For large solid stamps (with a side of square or diameter up to 600 mm) for forming forgings from structural steels and high temperature alloys hammers and crank presses (instead of less heat-resistant steel grades 5KHNM, 4KHMFS); tools (clamping and forming panels composing and forming punches) for the landing of structural steel and heat resisting alloys on horizontal forging machines (GCM); knife hot cutting
4KH3VMF	For small hammer stamps, hammer and pressing the inserts (thickness or diameter from 300 mm to 400 mm), tool, horizontal forging machines for hot deformation of structural steels and heat resisting steels; tool machine for high speed punching of structural steel
3KH3M3F	For the tool of hot deformation on crank presses and horizontal forging machines exposed in the process of intensive cooling (usually small tools); moulds die casting copper alloys
4H5MFS	For small hammer stamps; large (thickness or diameter greater than 200 mm) hammer and pressing panels during hot deformation of structural steels and nonferrous alloys in a high-volume mass production
4KH4VMFS	Tool high-speed punching machine, landing on horizontal forging machines; inserts of dies for hot deformation of alloy structural steel and heat-resistant alloys hammers and crank presses (instead of less heat-resistant steel grades 4KH5V2FS, 4KH5MF1S, 4KH3VMF); molds of pressure casting of copper alloys
4KH5MF1S, 4KH5V2FS	For molds of injection molding zinc, aluminum and magnesium alloys; hammer and pressing the inserts (thickness or diameter from 200 to 250 mm) during hot deformation of structural steels; tool for planting billets of alloyed structural and heat-resistant materials on horizontal forging machines
4KH2V5MF	Heavy duty press tool (small inserts final die steels Creek, a small plug-in signs, matrices and punches for extrusion, etc.) during hot deformation of alloy structural steel and heat-resistant alloys
5KH3V3MFS	Heavy duty press tool (piercing and forming punches, matrices, etc.); instrument for landing on horizontal forging machines and inserts of dies strained structures, for hot volumetric deformation of structural steels and heat-resistant metals and alloys (instead of less heat-resistant steel grades 3Х2В8Ф and 4KH2V5MF). Most high hardenability and heat resistance of a steel 5KH3V3MFS brand
05KH12N6D2MFSGT	Tool shaping parts of molds for the molding of rubber and plastic products

ANNEX B (reference). Hardness after hardening tool steel alloy

APPENDIX B
(reference)

The hardness of samples after quenching from optimal temperatures for various grades of alloy tool steels is given in table B. 1.

Table B. 1

Steel grade	Temperature, °C, and quenching the samples	Hardness HRC not less than
13KH	780−810, water	65
8KHF	800−820, water	59
	830−860 oil	59
	810−830, water	59
9KHF	850−880, oil	61
	820−840, water	61
X	840−860 oil	63
6KHS	840−860 oil	57
9G2F	780−800, oil	61
6KHVG	850−900, oil	58
V2F	800−850, water	63
4KHS	880−900 oil	48
CVH	830−850 oil	63
6KHV2S	860−900 oil	58
5KHV2SF	860−900 oil	56
6KH3MFS	980−1020, oil	57
7KHG2VMF	840−880, air	59
9KH5VF	950−1000, oil	59
8KH6NFT	950−1000, oil	59
6KH4M2FS	1050−1070, oil	60
KH6VF	980−1000, oil	62
8KH4V2MFS2	1060−1090, oil	61
11KH4V2MF3S2	1000−1030, oil	63
6KH6V3MFS	1055−1075, oil	61
X12	950−1000, oil	61
KH12MF	950−1000, oil	61
KH12F1	1050−1100, oil	61
KH12VMF	1020−1040, oil	61
5KHNM	830−860 oil	57
5KHNV	840−860 oil	57
5KHNVS	860−880 oil	57
7X3	850−880, oil	55
8X3	850−880, oil	56
4KHMFS	920−930, oil	56
5KH2MNF	960−980, oil	57
4KH3VMF	1040−1060, oil	53
3KH3M3F	1030−1050, oil	48
4H5MFS	1000−1020, oil	51
4KH4VMFS	1050−1070, oil	56
4KH5MF1S	1020−1040, oil	51
4KH5V2FS	1030−1050, oil or air	51
4KH2V5MF	1060−1080, oil	51
5KH3V3MFS	1120−1140, oil	54
05KH12N6D2MFSGT	990−1020, oil or air	28
Note — Steel 05KH12N6D2MFSGT Maraging. High hardness steel of this steel provided by the aging at a temperature of 480−500 °C for 4 h.

ANNEX b (informative). Curves of hardness according to Rockwell (HRC) from the tempering temperature of

THE APP
(reference)

Figure B. 1	Figure B. 2	Figure B. 3

Figure B. 4	Figure V. 5	Figure B. 6

Figure V. 7	Figure V. 8	Figure B. 9

Figure V. 10	Figure V. 11	Figure V. 12

Figure V. 13	Figure V. 14	Figure V. 15

Figure V. 16	Figure V. 17	Figure V. 18

Figure V. 19	Figure V. 20	Figure V. 21

Figure V. 22	Figure V. 23	Figure V. 24

Figure V. 25	Figure V. 26	Figure V. 27

Figure V. 28	Figure V. 29	Figure V. 30

Figure V. 31	Figure V. 32	Figure V. 33

Figure V. 34	Figure V. 35	Figure V. 36

Figure V. 37

APPENDIX d (mandatory). Description of scale scale N 1 and N 1 for the evaluation of the microstructure of alloy tool steels (X500)

APPENDIX D
(required)

Description of scale scale N 1 and N 1 for the evaluation of the microstructure of alloy tool steels (500)

Scale N 1 includes 10 points of possible microstructures annealed or vysokoopasnye steel.

The microstructure of the points from 1 to 5 — the structure of granular perlite with a grain size of cementite to less than 1 to 10 microns.

The microstructure of scores from 6 to 10 — structure of granular perlite with an ever increasing number of lamellar perlite (by area):

score 6 to 10% of lamellar pearlite;

a score of 7 — to 30% of lamellar pearlite;

score 8 — up to 50% of lamellar pearlite;

a score of 9 — up to 80% of lamellar pearlite;

a score of 10 to 100% of lamellar pearlite.

Steel microstructure, lying between neighbouring points of the scale are in the evaluation of more points.

Score 1	Score 2

Score 3	Score 4

Score 5	Score 6

A score of 7	Score 8

A score of 9	Score 10

APPENDIX e (mandatory). Description of the scale N 2 and N 2 scale to assess the heterogeneity of the carbide steel grades X12, KH12VMF, KH12MF, KH12F1 (X100)

APPENDIX E
(required)

Description of the scale N 2 and N 2 scale to assess the heterogeneity of the carbide steel grades X12, KH12VMF, KH12MF, KH12F1 (100)

On a scale of N 2 the microstructure of carbide heterogeneity of steel appreciate the 10 points, and each point has two standard structures. The upper microstructure is designed to assess a carbide heterogeneity of the steel samples after heat treatment (hardening — tempering).

The lower microstructure designed to assess the carbide heterogeneity of the annealed steel samples.

Description of microstructures corresponding to individual points of the scale:

score 1 — the uniform distribution of carbides;

score 2 — slightly severe banding, thin lines of carbides;

score 3 — stroke arrangement of carbides;

score 4 — pronounced banding, rough lines of carbides;

score 5 is greatly deformed, broken in some places mesh carbide;

score 6 deformed mesh of the eutectic carbides;

a score of 7 — solid deformed mesh carbides with areas of eutectic;

score 8 — weakly deformed mesh plots carbides with eutectic;

score 9 — weakly deformed mesh with coarse carbide eutectic;

score 10 — structure corresponding to the structure of cast steel.

Score 1	Score 2

Score 3	Score 4

Score 5	Score 6

A score of 7	Score 8

A score of 9	Score 10

ANNEX E (mandatory). Description scale N scale N 3 and 3 to assess heterogeneity of carbide steel grades 9KH5VF, 8KH6NFT, 8KH4V2MFS2, KH6VF, 6KH6V3MFS, 11KH4V2MF3S2, 6KH4M2FS (X100)

ANNEX E
(required)

Description scale N scale N 3 and 3 to assess heterogeneity of carbide steel grades 9KH5VF, 8KH6NFT, 8KH4V2MFS2, KH6VF, 6KH6V3MFS, 11KH4V2MF3S2, 6KH4M2FS (100)

Scale N 3 carbide heterogeneity of steel appreciate the 10 points.

Description of microstructures corresponding to individual points of the scale:

score 1 — the uniform distribution of carbides;

score 2 — slightly severe banding;

score 3 — the banding;

score 4 — pronounced banding;

score 5 — pronounced banding of the accumulations;

score of 6 — pronounced banding of the accumulations, broken deformed mesh of the eutectic carbides;

a score of 7 — deformed mesh of the eutectic carbides, torn in some places;

point 8 — solid deformed mesh of the eutectic carbides;

a score of 9 — solid deformed mesh with clusters of carbides;

score 10 — structure corresponding to the structure of cast steel.

Score 1	Score 2

Score 3	Score 4

Score 5	Score 6

A score of 7	Score 8

A score of 9	Score 10

APPENDIX g (mandatory). Description of scale scale N 4 and N 4 for the evaluation of carbide mesh of alloy tool steels (X500)

APP W
(required)

Description of scale scale N 4 and N 4 for the evaluation of carbide tool steel alloy grid (500)

N scale 4 includes two possible standard types of carbide in the steel mesh of six standards each:

— top — coarse mesh (average relative diameter of the cell — ~ 0,045 mm);

— lower chicken wire mesh (average relative diameter of a cell is ~ 0.025 mm).

The standards are as closed carbide mesh and correspond to the following points:

score 1 almost uniform distribution of carbide particles;

point 2 — there are a few chains carbide particles;

score 3 — chain of the carbide particles in the form of scraps of mild mesh;

score 4 — chain carbide particles in the form of clear mesh;

score 5 — chain, the carbide particles form a grid with individual completely closed cells;

score 6 — carbide particles form a grid with completely closed cells and side cells have not only chains of carbides, but solid lines.

Score 1	Score 2

Score 3	Score 4

Score 5	Score 6

AND APPLICATION (required). Scale N 5 to estimate the grain size of the austenite of alloy tool steels by fracture

THE APPLICATION AND
(required)

N scale 5 consists of five numbers the grains of austenite steel.

Description scale N 5 to evaluate the fracture grain size of the austenite of alloy tool steels are given in table I. 1

Table I. 1

The number of grain	The type of fracture
1	Coarse, shiny with clearly visible grains
2	Medium shiny with clearly visible grains
3	Medium-grained with a matte not clearly visible grains
4	Fine-grained with a matte almost indistinguishable grains
5	Very fine-grained matte with invisible grains

APP TO (optional). Methodology to control the microstructure of alloy tool steels in

APP TO
(required)

The scheme for sampling their shape and size are given in table K. 1.

Table K. 1

The number of the figure	The scheme of cutting specimens from the rod	The location of the plane of the thin section to the extrusion direction by rolling or forging	The size of the rent, mm	Controlled structure
1		Across	Up to 25 incl.	Granular pearlite, carbide mesh, the grain of austenite
2		Along	To 40 incl.	Carbide heterogeneity
3		Across	From 26 to 40 incl.	Granular pearlite, carbide mesh, the grain of austenite
4		Across	From 41 to 50 incl.	Granular pearlite, carbide mesh, the grain of austenite
5		Along	From 41 to 50 incl.	Carbide heterogeneity
6		Across	SV. 50	Granular pearlite, carbide mesh, the grain of austenite
7		Along	SV. 50	Carbide heterogeneity
Notes: 1 Templet for the sample cut at a distance of not less than 20 mm from the end of the rod. 2 the Plane of the thin sections in figures are shaded. 3 Control of microstructure of annealed steel (granular pearlite, carbide mesh) and hardened steel (austenite grain) should be carried out on thin sections, the plane of which is perpendicular to the extrusion direction during rolling and forging. The recommended dimensions of the plane of the socket to control the microstructure of bars of circular section shall be as follows: a) for bars with diameter up to 25 mm — total cross section plane of the rod (figure 1); b) for rods with a diameter of 26 to 40 mm — half plane of the cross section of the rod (figure 3); C) for bars with a diameter from 41 to 50 mm — a quarter of the plane of the cross section of the rod (figure 4); g) for bars with a diameter of 51 mm higher than the plane section of the cone should correspond to figure 6. 4 Control of carbide heterogeneity should be conducted in sections, the plane of which is parallel to the extrusion direction during rolling and forging. 5 Carbide heterogeneity depending on the cross-sectional shape should be monitored: — a circle in the middle of the radius; — square — 0.25 of the square from the middle of the side; — strip — 0.25 thickness from the middle of the broad side. 6 Samples for control of carbide mesh, carbide inhomogeneity and grain size of austenite is subjected to quenching from the temperatures specified in table 4 of this standard and Appendix B for the relevant steel grade. 7 Permitted: a) control carbide mesh on the longitudinal sections. In arbitration cases, the control should only be carried out on transverse sections; b) control of heterogeneity carbide steel grades X12, KH12VMF, KH12MF, KH12F1 on the samples after quenching and tempering at 400 °C and on samples after annealing; C) control of non-metallic inclusions in the quenched samples. The quenching temperature stated in 4.1.2.2 of this standard and Appendix B for the relevant steel grade. 8 Samples of ground and polished by conventional methods adopted by the companies in the production of micro-sections. Samples for the control of grain size of austenite before quenching should be polished after quenching and subjected to a light polishing. 9 Etching of thin sections hold 4% solution of nitric acid in ethyl alcohol. Under the control of carbide heterogeneity of steel products of steel grades X12, KH12VMF, KH12MF, KH12F1 on the annealed samples it is recommended to apply electrolytic etching of microsections in a 10% aqueous solution of oxalic acid (etching: current density 40 A/DM, the etching time from 30 to 40). 10 Control of non-metallic inclusions is carried out on netravlenoy sections. 11 Evaluation of granular perlite is carried out at a magnification of 500 by the included scale N 1 references microstructures (Appendix G). Evaluation of carbide mesh is carried out at a magnification of 500 at a six-point scale N 4 (Appendix G). Evaluation of carbide heterogeneity is carried out at a magnification of 100: — steel grades X12, KH12VMF, KH12MF, KH12F1 — scale N 2 (Annex D); — steel grades 9KH5VF, 8KH6NFT, 8KH4V2MFS2, KH6VF, 6KH6V3MFS, 11KH4V2MF3S2, 6KH4M2FS — scale N 3 (Appendix E). Evaluation of non-metallic inclusions is carried out at a magnification of 100 on the scale GOST 1778. 12 Increase that measure microstructure, are recommended. Depending on the magnification of the microscope is allowed to control granular pearlite and carbide mesh at magnifications from 450 to 600, carbide heterogeneity and non-metallic inclusions, while increasing from 90 to 125. 13 Evaluation of the microstructure (granular pearlite, carbide mesh, carbide inhomogeneity, the grain of austenite) is performed for the portion of the cone with the worst structure, and for steel up to 25 mm in view of the entire plane of the socket, for metal products large — field cone half radius ±5 mm. It should be noted that the presence of the lamellar structure of the pearlite due to the carbon depletion of the surface layer of steel products, annealed on the granular perlite, to the evaluation of the microstructure does not apply, and is taken into account only when assessing bezoperatsionnogo layer.