TU 14-131-1134-2014 with amendments

I APPROVE Technical Director JSC Metallurgical Electrostal plant I.V. Kabanov «20» 01 2014

HOT ROLLED AND SPECIAL FINISHED RODS

SURFACES MADE OF CORROSION-RESISTANT STEEL GRADE

07X16N19M2G2BTR-ID (EK164-ID)

TECHNICAL SPECIFICATIONS

TU 14-131-1134-2014

Holder of the original: JSC "Metallurgical Plant "Elektrostal"

Expiry date:

AGREED: Technical Director JSC Machine-Building Plant A.V. Zhiganin Director of the Department JSC "VNIINM" named after A.A. Bochvar M.V. Skupov Chief Designer of RU BN JSC "Afrikantov OKBM" B.A. Vasiliev

DEVELOPED BY: Head of Technical Department JSC Metallurgical Plant "Elektrostal" I.M. Vorobyova

On page 7.

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These technical conditions apply to the supply of hot-rolled rods and rods with special surface finishing made of steel grade 07X16H19M2G2BTR-ID (EK164-ID), smelted in a vacuum-induction furnace with subsequent vacuum-arc remelting. Smelting is performed on highly pure charge materials.

Example of a symbol:

Hot-rolled rod, round, high rolling precision (A1), measured length (ML), 30 mm in diameter according to GOST 2590-2006, made of steel grade 07X16H19M2G2BTR-ID (EK164-ID), heat-treated (HT):

Circle

Rods with special surface finishing, round, quality h₁₁, measured length (ML), diameter Ø8 mm, made of steel grade 07X16H19M2Г2БТР-ИД (ЭК164-ИД), surface quality group G according to GOST 14955-77, heat treated (HT):

Circle

The list of regulatory documents referenced in the text of the technical specifications is given in Appendix A.

1 ASSORTMENT.

1.1 The shape, dimensions and maximum deviations of the rods must correspond to:

a) hot-rolled round bars are supplied in a turned condition with a diameter of 28 to 39 mm according to GOST 2590, high rolling precision (A1).

The curvature of hot rolled bars must correspond to class I.

b) with special surface finishing supplied from 7 to 28 mm GOST 14955 quality h₁₁.

The rods must be straight. The local curvature of the rods on any section of a rod 1 m long is no more than 0.5 mm.

1.2 The measured length of the rods is 2200 mm or a multiple of 1100 mm. The tolerance for the measured and multiple length is +50 mm.

1.3 It is permitted to supply rods of other sizes according to the agreed specification.

2 TECHNICAL REQUIREMENTS.

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

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Table 1

Mass fraction of elements, %

carbon

silicon

manganese

sulfur

phosphorus

chromium

nickel

molybdenum

niobium

titanium

vanadium

boron

nitrogen

cobalt

cerium

aluminum

0,060 0,080

0.45 0.60

1.50 2.00

n.b. 0,010

0,010 0.025

15.00 16.00

18.5 19.5

2.0 2.5

0,1 0.4

0.25 0.50

n.b. 0.15

0.004 0.006

n.b. 0.02

n.b. 0.02

n.b. 0.15

n.b. 0,1

Notes:

1. Vanadium is introduced into the metal based on calculations; the actual mass fraction is entered into the quality document.
2. Cerium is introduced into the metal by calculation and is not determined by chemical analysis.
3. The permissible deviation in the mass fraction of silicon is plus or minus 0.05%.
4. A deviation of 0.05% in the mass fraction of chromium is allowed.
5. The permissible deviation in the mass fraction of manganese is plus or minus 0.05%.
6. The permissible deviation in the mass fraction of carbon is plus 0.010%.

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2.2 The rods are supplied in a heat-treated (hardened) condition. Recommended mode: hardening from a temperature of (1020-1100) °C, cooling in water or air. Hardening may be carried out from the temperature of the end of rolling. It is allowed to adjust the heat treatment mode to ensure the standards of mechanical properties and grain size. The actual heat treatment mode is specified in the quality document.

2.3 Mechanical properties determined at room and elevated temperatures must meet the requirements of Table 2.

Table 2

Test temperature, °C	Mechanical properties, not less than
	Ultimate strength σ in , N/mm² (kgf/mm²)	Yield strength σ 0.2 , N/mm² (kgf/mm²)	Relative elongation δ₅, %
room	540 (55)	215 (22)	30
650	350 (36)	118 (12)	20

Note: 1 It is permitted to supply rods with a special surface finish with a diameter of less than 10 mm with a relative elongation of at least 15% (at room temperature) in five heats, after which the standards are specified.

2.4 Local defects on the surface of hot-rolled bars are not allowed if their depth exceeds 50% of the sum of maximum deviations. The depth of occurrence of defects is calculated from the actual size.

2.5 The surface quality of rods with special surface finishing must comply with group "G" of GOST 14955.

2.6 The macrostructure must not have shrinkage cavities and looseness, cracks, slag inclusions, crusts, delaminations visible without the use of magnifying devices. Permissible defects of the macrostructure must not exceed:

central porosity - 1 point;

point heterogeneity - 1 point;

liquation square - 1 point;

Layered crystallization and increased etchability square are not a rejection feature.

2.7 Grain size is not larger than 7 points.

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2.8 The content of non-metallic inclusions according to the maximum score should not exceed:

line oxides (OS) - 2.0 points;

point oxides (PO) - 2.0 points;

brittle silicates (SC) - 2.0 points;

plastic silicates (SP) - 1.0 points;

non-deformable silicates (SN) - 1.0 points;

sulfides (C) - 1.0 points;

nitrides and carbonitrides, row (NS) - 3.0 points;

point nitrides and carbonitrides (NT) - 3.0 points.

2.9 The steel shall withstand the test for resistance to intercrystalline corrosion.

2.10 The rods are supplied with ultrasonic testing in accordance with GOST 21120, quality group 1.

3 ACCEPTANCE RULES AND TEST METHODS

3.1 Acceptance rules and testing methods for hot-rolled rods in accordance with GOST 5949. Acceptance rules and testing methods for rods with special surface finishing in accordance with GOST 14955.

3.1.1 The diameter of hot-rolled rods is measured with a caliper in accordance with GOST 166; rods with a special surface finish are measured with a micrometer in accordance with GOST 6507.

3.1.2 The results of all tests are recorded in the quality document.

3.2 The rods are presented for acceptance in batches consisting of blanks of the same heat and the same size. A quality document is issued for each batch.

3.3 Vacuum arc melting includes ingots melted from one initial melt.

3.4 Sampling for chemical analysis is carried out in accordance with GOST 7565.

Chemical analysis is carried out according to GOST 12344 - GOST 12348, GOST 12350, GOST 12352 - GOST 12354, GOST 12356, GOST 12357, GOST 12359 - GOST 12361 and GOST 28473 or other methods that ensure the accuracy of determination established by the standards.

3.5 Mechanical properties are tested on samples in the delivery condition. It is permitted to test mechanical properties at a temperature of 650 °C for rods smaller than Ø10 mm in an intermediate blank on samples heat-treated according to the mode specified in paragraph 2.2. Tests of mechanical properties at room temperature are carried out according to GOST 1497, at elevated temperatures - according to GOST 9651.

3.6 Grain size control is carried out in accordance with GOST 5639 in the delivery condition.

3.7 The content of non-metallic inclusions is controlled on six samples from the melt, one sample from the rod, according to the method and

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scales of GOST 1778 by method "Ш", option "Ш6". It is permitted to control non-metallic inclusions in the intermediate workpiece.

3.8 Ultrasonic testing is carried out in accordance with GOST 21120; the diameter of the control reflector should not exceed 3 mm. For rods with a diameter of less than 30 mm, testing is carried out in an intermediate blank.

3.9 Macrostructure control is carried out on 2 samples, one sample from each bar, according to the method and scales of GOST 10243. Macrostructure control in points is carried out in an intermediate workpiece.

3.10 The steel must withstand the test for resistance to MKK according to GOST 6032, AMU method with provocative heating at a temperature of 650 °C - 2 hours. Duration of boiling - 8 hours.

3.11 Conventional designations are indicated in the quality document.

4 MARKING, PACKAGING, TRANSPORTATION AND STORAGE.

4.1 Marking, packaging, transportation and storage of rods in accordance with GOST 5949 and GOST 14955.

4.1.1 Bars with special surface finish are supplied without lubrication, wrapped in paper and packed in wooden boxes.

REGISTERED: at JSC "Metallurgical Plant "Elektrostal" Head of the Standardization Bureau of the Technical Department O.B. Shvyryaeva

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Appendix A

(informative)

LIST OF ND,

which are referenced in the text of the technical specifications

Designation ND	Numbers of items in which there is a link
GOST 166-89	p. 3.1.1
GOST 1497-84	p. 3.5
GOST 1778-70	p. 3.7
GOST 2590-2006	p.p. 1.1
GOST 5639-82	p. 3.6
GOST 5949-2018	pp. 3.1; 4.1
GOST 6032-2007	p. 3.10
GOST 6507-90	p. 3.1.1
GOST 7565-81	p. 3.4
GOST 9651-84	p. 3.5
GOST 10243-75	p. 3.9
GOST 12344-2003	p. 3.4
GOST 12345-2001	p. 3.4
GOST 12346-78	p. 3.4
GOST 12347-77	p. 3.4
GOST 12348-78	p. 3.4
GOST 12350-78	p. 3.4
GOST 12352-81	p. 3.4
GOST 12353-78	p. 3.4
GOST 12354-81	p. 3.4
GOST 12356-81	p. 3.4
GOST 12357-84	p. 3.4
GOST 12359-99	p. 3.4
GOST 12360-82	p. 3.4
GOST 12361-2002	p. 3.4
GOST 14955-77	pp. 1.1; 2.5; 3.1; 4.1
GOST 21120-75	pp. 2.10; 3.8
GOST 28473-90	p. 3.4