GOST 14081-78

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  ГОСТ 14081-78

GOST 14081−78 Wire of precision alloys with specified temperature coefficient of linear expansion. Technical specifications (with Changes 1−5 N)

GOST 14081−78
Group В73

INTERSTATE STANDARD

WIRE OF PRECISION ALLOYS WITH SPECIFIED TEMPERATURE
COEFFICIENT OF LINEAR EXPANSION

Specifications

Wire of precision alloys with specified temperature coefficient of linear expansion.
Specifications

ISS 77.140.65
OKP 12 6600

Date of introduction 1979−01−01

INFORMATION DATA

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

2. APPROVED AND promulgated by the Decree of the State Committee of standards of Ministerial Council of the USSR from 09.03.78 N 640

3. REPLACE GOST 14081−68

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

5. The expiration time limit is removed by the Resolution of Gosstandart from 14.05.92 N 481

6. EDITION Changes N 1, 2, 3, 4, 5, approved in may 1982, August 1983, December 1984, June 1988, may 1992, (IMS 9−82, 12−83, 4−85, 11−88, 8−92)


This standard applies to cold drawn wire of precision alloys with specified temperature coefficient of linear expansion (CTE).

(Changed edition, Rev. N 4).

1. CLASSIFICATION AND ASSORTMENT

1.1. Wire classification:

as the wire diameter of 0.1−0.4 mm:

nagaremono,

soft (annealed) — M;

for precision manufacturing:

qualitity h8, h9, h10, h11,

qualitity js8, js9, js10, js11;

for groups of CTE standards for grades and 29 NK 29NK-VI:

with normal limits

with narrowed limits — 1;

on frost resistance for alloys of 29NK and 29NK-VI:

to minus 70 °C,

to a temperature of minus 196 °C — U.

(Changed edition, Rev. N 3).

1.2. Wire diameters should correspond to GOST 2771 for a range of diameters R40. Wire manufactures limit diameters of 0.1−3.6 mm.

Limit deviations for diameters of 0.10−0.95 mm inclusive must conform to qualiteam h8, h9, h10 or js8, js9, js10, js11; for diameters of 1.00−3.60 mm inclusive, h9, h10, h11 or js9, js10, js11.

Wire for extreme deviations and h8, js8 produce on demand of the consumer.

For a wire diameter of 3.00−3.60 mm allowed rounding limit deviations to hundredths of a millimeter.

(Changed edition, Rev. N 2, 4, 5).

1.3. The roundness of the wire must not exceed half of the limit deviation for diameter.

Examples of symbols:

The alloy wire of the brand 29NK-1, Nagarjuna, with a diameter of 1.0 mm of tolerance js10 with frost down to minus 196 °C:

.

The same, of alloy grade 30NKD, heat-treated, with a diameter of 0.3 mm, the tolerance js8:

.

The same alloy of the brand 29NK-VI-1, Nagarjuna, diameter of 2.2 mm, quality h10 with cold resistance to minus 70 °C:

.

(Changed edition, Rev. N 3).

2. TECHNICAL REQUIREMENTS

2.1. Wire of precision alloys with specified temperature coefficient of linear expansion shall be manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

2.2. Chemical composition and content of gases in alloys of 29NK, 29NK-VI, 36N, 33NK, 33NK-VI, 48NKH, 47NKH, 30NKD, 30NKD-VI, 38NKD, 38NKD-VI, 47ND, 47ND-VI, 42N, 52N, 52N-VI, 47NKHR must match what is specified in GOST 10994.

2.1, 2.2. (Changed edition, Rev. N 3).

2.3. Wire with a diameter of more than 0.4 mm are made hard. Wire diameter 0.1−0.4 mm produce hard-drawn or annealed (soft).

Note. Customer’s request wire diameter more than 0.4 mm produce thermally processed, specifying the requirements to the surface.


(Changed edition, Rev. N 4).

2.4. The hard-drawn wire surface should be smooth, without delamination, pinches, cracks or scratches. The surface of the heat-treated wire should be clean, free of delaminations, pinches, cracks or scratches, shiny, matte, gray, or light gray.

The wire allowed some local defects in the form of transverse marks and small tears to a depth of no more than half of the limit deviation for diameter and heat treated wire from the alloys doped with chromium, the shades of green.

Note. Allowed to clarify the characteristics of the wire surface according to the standards agreed in the prescribed manner, indicating the type and number of defects per unit area.


(Changed edition, Rev. N 4, 5).

2.5. Allowed Stripping defects in the wire, the depth of Stripping shall not display wire beyond the minimum diameter.

(Changed edition, Rev. N 4).

2.6. Temperature coefficient of linear expansion and the temperature of the inflection point, defined on the heat-treated samples shall be as specified in the table.

Notes:

1. The grades 29NK-1 and 29NK-VI-1 produce on demand of the consumer.

2. Norms in brackets — norms CTE in this temperature range provided for wire of ordinary quality, standards without brackets — wire of high quality.


(Changed edition, Rev. N 3, 4).

2.7. Wire of alloy 29NK brands, 29NK-VI, 29NK-1, 29NK-VI-1, 30NKD and 30NKD-VI should be hardy to minus 70 °C. At the customer’s request wire alloy 29NK brands, 29NK-1, 29NK-VI, 29NK-VI-1 are made with cold resistance to minus 196 °C.

2.8. Customer’s request wire produced:

definition of grain size;

with the definition of the CTE of alloy grade 42N;

with the determination of mechanical properties in the tensile test;

with the test wire at the bend or winding;

control of contamination of metal non-metallic inclusions in the billets with a diameter of not less than 6 mm;

with the determination of the magnetic properties.

Note. Rules established by agreement between manufacturer and consumer.

2.9. Physical and magnetic properties of the alloys, the average values of CTE for different ranges of temperatures (from minus 100 to plus 800 °C) and the recommended modes of heat treatment are given in appendices 1−3 to GOST 14080.

3. ACCEPTANCE RULES

3.1. Rules of acceptance GOST 7566.

3.2. Wire take parties. The party should consist of wire of the same diameter, one melting and one state of the material, drawn up by one document on quality.

3.3. To check the quality of wire from melting taken:

for the chemical analysis of the sample according to GOST 7565;

for determination of gas content three samples from each tenth of the melt;

to determine the temperature coefficient of linear expansion and temperature of the inflection point — one sample;

to check the contamination of metal non-metallic inclusions of the sample according to GOST 1778.

3.4. To check the frost resistance, mechanical properties to determine the magnetic properties, grain size, and tested to break and the winding of the party selected two coils, two coils or two mandrels.

3.5. Diameter limit deviation and surface quality check on each spool, reel or mandrel.

3.6. The chemical composition of the alloys and CTE certified company, smelting metal, in the document about quality.

3.4−3.6. (Changed edition, Rev. N 3).

3.7. The temperature of the inflection point check at the request of the consumer.

(Added, Rev. N 3).

4. TEST METHODS

4.1. For each of the tests specified in paragraph 3.4 must be selected one sample from a coil, reel or mandrel.

4.2. Chemical analysis of the alloys is carried out according to GOST 12344−12365 and GOST GOST 28473 or other methods providing the required accuracy of the analysis.

4.3. The gas content is determined according to GOST 17745, or by other methods providing the required accuracy of the analysis.

4.4. Wire diameter check micrometer according to GOST 6507 or other measuring instruments of appropriate accuracy not less than one turn from the end of a coil, reel or mandrel.

(Changed edition, Rev. N 3).

4.5. The surface quality of the wire is checked visually. Control of surface quality of wire, wound on a reel or mandrel, carried on the outside of the coils or in the process of technological operations.

If there is disagreement in assessing the quality of the surface is inspected at magnification 16. The depth of the defect is determined by the sweep. The location of the defect cleaned with sandpaper or a file with further comparative dimension to the stripped and unstripped areas. If you cannot determine the depth of the defect Stripping determination of the depth and nature of the defect may be performed by metallographic methods.

Allowed the detection of surface defects by etching to hold samples of length not less than 250 mm sampled from both ends of a coil, the modes of etching is determined by agreement between manufacturer and consumer.

(Changed edition, Rev. N 4).

4.6. Control of temperature coefficient of linear expansion and temperature of the inflection point is performed according to the method given in Annex 4 to GOST 14080.

Note. By agreement between manufacturer and consumer for production batch have attached a sample to check CTE at the consumer.

4.7. Frost resistance is determined according to the method given in Annex 5 to GOST 14080.

It is possible to use statistical methods to control frost resistance according to technical documentation approved in the established order.

Wire one of melting, the last test for frost resistance in large sections when shipped in small sections to test for the absence of the phase is allowed to expose.

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

4.9. The mechanical properties determined according to GOST 10446 on samples with an estimated length of 100 mm.

4.10. Test bend is carried out according to GOST 1579.

4.11. The test winding is carried out according to GOST 10447.

4.12. Control of non-metallic inclusions is carried out according to GOST 1778 by the method of SH1 or Ш4.

4.13. The magnetic properties determined by the procedure agreed between the manufacturer and the consumer.

5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. Marking, packaging, transportation and storage — by GOST 7566.

5.2. Wire with diameter more than 0.45 mm needs to be in rolls. The wire diameter of 0.45 mm and less shall be wound on a reel or mandrel.

At the request of the consumer nagaremono wire diameter of 0.45 mm and less are made in rolls.

5.1, 5.2. (Changed edition, Rev. N 3).

5.3. Coils, coil and mandrel should be wrapped in one or more layers of waterproof paper GOST 8828, GOST 10396, 9569 GOST and other normative and technical documentation and laid in serried ranks in boxes of types I or II according to GOST 2991или other normative technical documentation or specialized metal containers, drums and other metal containers according to normative-technical documentation, developed in accordance with the requirements of GOST 6247, GOST 26155, GOST 15102 and ensuring the safety of products during transportation and storage.

Allowed coils of wire with a diameter of 2.0 mm and more packaging in single or multiple layers of paper according to GOST 9569, GOST 8828, GOST 10396, then, in the film according to GOST 10354, GOST 16272 holstoproshivny or tare the fabric according to GOST of 14,253, non-woven cloth, stitched the flap of waste textile industry or other types of packaging materials according to normative-technical documentation, with the exception of cotton and linen fabrics. Packed skeins must be tied with wire according to GOST 3282, OST 14−15−193 or other normative and technical documentation or some other way to protect the packs from unwinding.

The outer diameter of a coil should be no more than 1200 mm, internal — not less than 180 mm.

Each coil of wire with a diameter of 3.0 mm and at least one attached label. Labels firmly attached to coils of wire according to GOST 3282 or other normative and technical documentation with a dense akruthi all.

During transportation of the wire rail small shipments wire Packed in shipping containers and specialized containers.

(Changed edition, Rev. N 3, 4, 5).

5.4. To protect the wire from corrosion is allowed to apply tension industrial oils brands-20A,-40A according to GOST 20799 inhibitors.

5.5. Weight of cargo must not exceed:

80 kg — with manual loading and unloading;

1250 kg — with mechanized loading and unloading.

5.6. Transportation of the wire should be made by all kinds of transport in covered vehicles or containers in accordance with cargo carriage regulations applicable to transport of this type, and conditions of loading and fastening of cargoes, approved by the Ministry of Railways of the USSR.

5.7. Wire should be stored in warehouses at temperatures from minus 30 to plus 50 °C and relative humidity not more than 95% in the absence of air in alkaline, acidic and other aggressive contaminants. Long-term storage (1 month or more) must comply with GOST 15150, storage conditions 1L.

5.8. Transport marking under GOST 14192.

5.4−5.8. (Changed edition, Rev. N 3).

5.9. When you ship two or more packages to one of the consumer spend consolidation packages in accordance with GOST 21650, GOST 24597.

(Changed edition, Rev. N 5).