TU 14-1-1062-74

USSR MINISTRY OF FERROUS METALLURGY

OKP 09 6400 AGREED: Deputy Chief organizations P.O. Box A-1795 __________ KHOKHLOV L.S. "7" _____08_____ 1974

UDC 669.14-422 + + 669.14-418.2 Group B 32 I APPROVE: Chief Engineer Glavspetsstal MChM __________ KULTYGIN V.S. "27" _____09_____ 1974

CORROSION-RESISTANT STEEL RODS AND STRIPS

GRADES 25Х17Н2Б-Ш ELECTROSLAG REMELTING

TECHNICAL SPECIFICATIONS

TU 14-1-1062-74

(replaces CMTU-1-593-68)

The deadline for introduction is 06.02.85

AGREED: Head of the enterprise P.O. Box R-6762 __________ ERMOLENKO A.P. "9" _____07_____ 1974 Head of the laboratory standardization of the Central Research Institute of the Human Microbiology /Kolyasnikova R.I./

DEVELOPED BY: Chief Engineer of Zlatoustovsky metallurgical plant __________ UCHAEV N.N. "13" _____06_____ 1974

1974

These technical conditions apply to hot-rolled and forged rods and strips and rods with a special surface finish made of corrosion-resistant steel grade 25Kh17N2B-Sh of electroslag remelting.

Examples of symbols:

Hot-rolled rod, round, of normal rolling accuracy (B1), class II in curvature, non-dimensional length (ND), 50 mm in diameter according to GOST 2590-2006, made of steel grade 25Kh17N2B-Sh, for cold mechanical processing (subgroup b), heat-treated (HT):

Circle .

Forged rod, square, non-dimensional length (ND), with a square side of 70 mm according to GOST 1133-71, made of steel grade 25Kh17N2B-Sh, for hot pressure treatment (subgroup a), heat-treated (HT):

Square .

Rod with special surface finish, round, h9 quality, with surface finish quality group G, 3 mm in diameter according to GOST 14955-77, made of steel grade 25Kh17N2B-Sh, heat-treated (HT):

Circle .

Hot-rolled strip (h/r), measured length (ML), 30 mm thick, 120 mm wide according to GOST 4405-75, made of steel grade 25Kh17N2B-Sh, for cold mechanical processing (subgroup b), heat-treated (HT):

Stripe .

The list of regulatory documents (RD), referenced in the text of the technical specifications, is given in Appendix 1. Codes for steel grades, rods and strips are given in Appendix 2.

1. ASSORTMENT

1.1. The products are supplied in the form of strips and rods of round and square cross-section with a diameter or square side size of up to 250 mm and a length of more than 1 meter.

1.2. Rods and strips must meet the requirements of the following standards:

a) hot rolled - GOST 2590, GOST 2591, GOST 4405

b) forged - GOST 1133, GOST 4405

c) with a special surface finish with a diameter from 3 to 45 mm - GOST 14955 (for groups

surface finishing qualities B, G, D and h9, h10, h11)

NOTE: For forged round bars with diameters over 200 to 250 mm

A diameter deviation of plus 10 mm is allowed.

Rods and strips are supplied in accordance with the manufacturer's specialization.

1.2.1. The curvature of hot-rolled rods with a diameter over 200 mm must be no more than 0.5% of the length.

2. TECHNICAL REQUIREMENTS

2.1. The chemical composition of steel must meet the requirements of Table 1.

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Developer.					Technical conditions Rods and strips made of corrosion-resistant steel grade 25X17N2B-Sh	Lit.			Sheet	Sheets
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Table 1

Steel grade	Mass fraction of elements, % %
	Carbon	Silicon	Manganese	Chromium	Nickel	Niobium	Copper	Sulfur	Phosphorus
							no more
25Х17Н2Б-Ш	0.22 0.26	0.3 0.7	0.3 0.7	16.3 17.7	2,3 2.8	0.05 0,1	0.25	0,015	0,020

NOTES: 1. The following deviations from the established standards of chemical composition are permitted:

by carbon ± 0.01%

for chromium ± 0.2%

for nickel ± 0.1%

2. Mass fraction of residual elements - in accordance with GOST 5632.

2.2. Rods and strips are supplied in a heat-treated condition with a hardness of no more than HB302 (imprint diameter of at least HB 3.5 mm).

2.3. The mechanical properties of rods and strips, determined on longitudinal heat-treated samples, must satisfy the requirements of Table 2.

Table 2

Heat treatment mode of samples	Mechanical properties, not less than
	Yield strength σ t	Temporary resistance σ in		Relative			Impact strength KCU J/ cm2 (kgf m/cm 2 )
				elongation δ 5 %		narrowing Ψ %
	N/ mm2 (kgf/ mm2 )
Hardening 1100 °C in oil, processed as if it were cold (-)70 °C 2 hours, tempering 250-320 °C 2 hours	1175 (120)	1470 (150)		8		45	39 (4.0)

Note: Finished samples with allowance for grinding are subjected to heat treatment.

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2.4. The macrostructure of rods and strips must comply with GOST 5949.

2.5. Contamination of steel with oxides, sulphides and silicates should not exceed 2.0 points for each type of inclusion, and nitrides - 3 points.

2.6. The surface quality must comply with the requirements of GOST 5949. The surface quality of rods with special surface finishing must comply with the requirements of GOST 14955.

2.7. The manufacturer guarantees the quality of the metal by hairlines during inspection of finished parts at the consumer's in accordance with the requirements of GOST 5949.

3. ACCEPTANCE RULES, TEST METHODS, MARKING, PACKAGING, DOCUMENTATION, TRANSPORTATION AND STORAGE

3.1. General rules for acceptance, testing methods, marking, packaging and documentation according to GOST 5949.

3.2. Macrostructure control is performed according to GOST 10243 on transverse templates cut from rods or strips corresponding to the head of the ingot.

Control of the macrostructure of rods up to 100 mm in size is performed in the full cross-section, and of rods over 100 mm in size - on samples reforged to sizes from 90 to 100 mm.

3.3. Contamination of steel with non-metallic inclusions is determined according to GOST 1778 using method Ш, option Ш1 or Ш4.

3.4. Determination of mechanical properties and non-metallic inclusions is performed on samples cut from blanks with a diameter of 90 to 100 mm.

For rods or strips smaller than 90 mm, the determination of mechanical properties and non-metallic inclusions is carried out in the finished grade.

3.5. It is permitted to check the macrostructure, mechanical properties and non-metallic inclusions in the intermediate

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workpiece and extend the test results to smaller profiles.

At the same time, the manufacturer guarantees the properties of the steel of the finished profiles in accordance with the requirements of these technical conditions.

3.6. It is not mandatory to indicate the profile size in the marking sign.

3.7. The steel is marked 25X17N2B-Sh.

3.8. Electroslag melting refers to metal smelted from one initial melt, in installations of one type in crystallizers of one size.

When remelting 2-3 consumable electrodes into one ESR ingot (paired and triple assembly), it is allowed to assemble consumable electrodes from 2-3 melts. With paired or triple assembly, the chemical composition of the ESR metal recorded in the quality document is determined from a sample taken from the supplied profile or reforged blank 80÷100 mm.

The chemical composition is determined on each ESR ingot.

3.9. Impact bending testing is performed on type I specimens.

3.10. Transportation and storage of metal products - in accordance with GOST 7566.

Registered: 17.10.74 Head of Technical Department Central Research Institute of Human Microbiology KAPLAN A.S. « » ____________ 1974

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P.3

Change #4

TU 14-1-1062-74

Appendix 1

Reference

List of regulatory documents for which there are

references in the text of technical specifications

Designation ND	The number of the item that contains the link
GOST 1133-71 GOST 1778-70 GOST 2590-2006 GOST 2591-2006 GOST 4405-75 GOST 5949-75 GOST 7566-94 GOST 10243-75	1.2 3.3 1.2 1.2 1.2 2.6, 2.7, 3.1 3.10 3.2