GOST 4727-83

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  ГОСТ 4727-83

GOST 4727−83 bearing Wire. Specifications (with Amendments No. 1, 2)

GOST 4727−83
Group В73

INTERSTATE STANDARD

BEARING WIRE

Specifications

Bearing wire. Specifications

GST 2300 12

Date of introduction 1984−07−01

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 03.02.83 N 625

3. REPLACE GOST 4727−67

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

5. Limitation of actions taken by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS 5−6-93)

6. EDITION with Amendments No. 1, 2 approved in August 1986, November 1988 (IUS 11−86, 2−89)

This standard applies to annealed round wire for the manufacture of balls, rollers and bearing rings.

(Changed edition, Rev. N 2).

1. TYPES AND BASIC DIMENSIONS

1.1. The wire is divided into:

1) precision manufacturing:

normal precision, high accuracy — P;

2) the quality of the surface layer and obesplozhennym:

first class — 1,

second grade — 2;

3) for the purpose:

for the balls;

for rollers and rings — R.

1.2. Nominal diameter limit deviation shall be as specified in table.1.

Table 1

mm

At the request of the customer can be manufactured of wire, the intermediate diameters not covered by the table.1. Limit deviation of these diameters shall correspond to the limit deviations of the nearest larger diameter.

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

Examples of symbols:

Wire diameter 2.5 mm, first class, normal manufacturing precision to balls of steel grade SHKH15 produced in an acid open-hearth furnaces:

Wire 2.5−1-SHKH15 GOST 4727−83

Wire diameter 5.5 mm, first class, high precision manufacturing for rollers and rings of steel grade SHKH15 electroslag remelting:

Wire of 5.5−1-P-R-SHKH15-W GOST 4727−83

Wire diameter 6.0 mm, of the second class, the normal precision manufacturing for rollers and rings of steel grade SHKH15 produced in electric arc furnaces with pumping (In):

Wire 6,0−2-R-SHKH15-GOST 4727−83.

1.1−1.3. (Changed edition, Rev. N 2).

2. TECHNICAL REQUIREMENTS

2.1. Wire shall be manufactured by the technical regulations, approved in a prescribed manner.

Wire shall be manufactured from wire rod of steel grades SHKH15 (produced in an acid open-hearth furnaces), SHKH15-sh (produced by electroslag remelting), SHKH15-(melted in electric arc furnaces with pumping) according to normative-technical documentation approved in the established order.

Chemical composition of steel shall conform to the requirements of GOST 801.

(Changed edition, Rev. N 1, 2).

2.2. The annealed wire must be made.

2.3. The surface of the wire should be light blue or without, rolled, bubbles, cracks, sunsets, captured, residues, scale and rust.

On the surface of the wire is not allowed risks, scratches, Rabina and nicks, depth of which exceeds a specified in table.2.

Table 2

mm

2.4. Rupture strength of the wire must be 590−720 N/mm(60−73 kgf/mm).

2.3, 2.4. (Changed edition, Rev. N 2).

2.5. Customer’s request wire diameter of 5.4 mm or more to withstand upset in a cold state to its original height.

2.6. Kink the wire with a diameter of 6.00 mm in the annealed condition should be homogeneous, fine-grained, residue-free shrinkage, placenow, foreign microflute, porosity, gas bubbles, czernowin and cracks from the burnout.

Kink the wire with a diameter of less than 6.00 mm after quenching needs to be fine-grained, porcelain-like, without residual shrinkage, placenow, foreign microflute, porosity, gas bubbles, czernowin and cracks from the burnout.

2.7. The hardness of the wire diameter of 6.0 mm and more for tempered samples should be not less than 63 HRC.

2.6, 2.7. (Changed edition, Rev. N 2).

2.8. The microstructure of wire must consist of uniformly distributed fine pearlite points 1−3 on scale N 8 GOST 801. The remains of a carbide mesh should be no more than 2 points on a scale of 4 N GOST 801.

2.9. Structural banding wire with a diameter of 5.4 mm or more must not exceed 2 points on a scale of 5 N GOST 801.

Carbide liquation of wire should not exceed the score of 0.5 on a scale of 6 N GOST 801.

2.10. Pollution wire non-metallic inclusions shall not exceed the limits given in table.3.

Table 3

2.11. Depth bezoperatsionnogo layer (ferrite+transition zone) wire of the 2nd class should not be more than 1% of the wire diameter.

Wire of the 1st class depth bezoperatsionnogo layer should not be more than shown in table.4.

Table 4

mm

2.10, 2.11. (Changed edition, Rev. N 2).

2.12. Wire is produced in coils weighing not less than 30 kg. are Allowed rolls of barbed wire weighing not less than 10 kg not more than 10% of the batch weight.

The inner diameter of the coil wire should be 300−750 mm.

A coil of wire must consist of one segment. Winding of wire should be carried out without entanglement of the coils and to permit the free unwinding coil.

3. ACCEPTANCE RULES

3.1. Wire is accepted by the parties. The party should consist of wire of the same diameter, the same melting and to be issued a document about quality that contains:

trademark name or mark of the manufacturer;

the room melt;

symbol;

the results of the tests;

chemical composition (plavecky);

mass;

the number of skeins.

3.2. For quality control of the wire must be selected:

a) measurement of diameter, ovality, matching the steel grade, the surface defect and tested to the breaking of wire in the annealed condition — 100% skeins;

b) for determination of the temporal rupture strength, microstructure, carbide mesh, structural poloschatosti, carbide elimination, depth bezoperatsionnogo layer, hardness, fracture in the tempered condition and tests on sediment — 5% skeins, but at least three;

C) to check the contamination by nonmetallic inclusions or six skeins of the party.

3.3. The results of the tests listed in subparagraph p. 3.2, apply to the entire party.

If unsatisfactory test results of at least one of the indicators listed in subparagraphs b and in p.3.2, it is carried out re-tests on twice the number of skeins has not being tested. The results of repeated tests apply to the entire party.

(Changed edition, Rev. N 1, 2).

4. TEST METHODS

4.1. To control the microstructure, bezoperatsionnogo layer, contamination of non-metallic inclusions, carbide mesh, hardness and fracture after hardening and testing on sediment is taken one sample from the roll; for the tensile test, the surface defect and estimation of the fracture of wire in the annealed condition — one sample taken from the two ends of this coil.

4.2. Diameter and ovality of wire check with a micrometer according to GOST 6507 in two mutually perpendicular directions of the same cross-section in at least three areas of a coil.

4.3. The detection of surface defects is carried out on the samples with 250 mm length, taken from two ends of each coil of the party. The samples are etched in a solution obtained by dissolving one volume of hydrochloric acid of density 1.18 g/cmin the same volume of water at a temperature of 60−80 °C for 20 min Etched samples are bleached in concentrated nitric acid.

Allowed the etching and bleaching of the samples is carried out in other solutions and conditions when obtaining identical results. Inspection of the surface of the etched samples is carried out visually. If necessary, use a magnifying glass a fivefold increase. The detection of surface flaws of a wire can be conducted by means of devices of nondestructive control.

4.4. The depth of the defects is determined by comparison of diameters of wire in place of the defect (after removal of defect with a file or sandpaper) and unstripped. In doubtful cases, determination of the depth of the defect is carried out with a microscope of any type.

4.5. Test wire tensile is carried out according to GOST 10446.

4.6. The microstructure and carbide grid test according to GOST 801. Carbide is allowed to control the net transverse sections.

4.7. Pollution wire non-metallic inclusions, structural banding and carbide liquation test according to GOST 801 or other regulatory-technical documentation.

In the manufacture of wire of different diameters of wire rod, melting one is allowed to check non-metallic inclusions, structural banding and carbide liquation on a wire with a diameter of 6.0 mm or more and the test results extend to the wire smaller.

4.8. Depth bezoperatsionnogo layer is determined according to GOST 1763 by the method of M.

4.9. Testing on sediment is carried out according to GOST 8817.

4.10. The hardness of the wire is measured according to GOST 9013 after cleaning and removal of bezoperatsionnogo layer.

Testing the hardness or fracture samples were quenched in the regime: heating at a temperature of (850±10) °C, exposure not more than 1,5 min for each millimeter of cross section and cooling in oil.

To obtain the fracture of the wire specimen is incised or naturlaut no deeper than the diameter and break off. Allowed control fracture wire diameter up to 3.0 mm carried out on the samples and the blank wire.

4.11. Grade of steel is confirmed by the spectrum stethoscope.

5. PACKING, MARKING, TRANSPORTATION AND STORAGE

5.1. Each coil of wire shall be tied with soft wire according to GOST 3282, or another wire in at least three places evenly spaced around the circumference of the rolls. The ends of the wire should be easy to find.

Coils of wire of one party is allowed to associate in the Bay.

(Changed edition, Rev. N 2).

5.2. The wire should be coated with a thin layer conservation and oil NG-203 grade A or for OST 38.01436 or K17 according to GOST 10877, or GSD, GSD-1 according to normative-technical documentation. Allowed the use of other types of preservative oils that protect the wire from corrosion.

5.3. Each coil of wire shall be wrapped with wrapping paper according to GOST 8828 or waxed according to GOST 9569, or paper other types that protect the wire from corrosion, and then a polyethylene film according to GOST 10354. Packaging wire in a fabric packing according to GOST 5530, non-woven fabric according to GOST 17923,19331 GOST and other normative-technical documentation in the tape barks or matting according to normative-technical documentation in the fabric of chemical fibers, fabrics of natural fibers (excluding cotton and linen fabrics) according to normative-technical documentation.

Mechanized method of packing is allowed to wrap covered in preservative oil wire crepe paper according to GOST 10396 or brand KMV-170 according to normative-technical documentation, or a polyethylene according to GOST 10354. By agreement between the consumer and the manufacturer the wire is not oil and not packaged.

(Changed edition, Rev. N 2).

5.3. The gross mass of the coil wire should not exceed 500 kg.

The package is formed into transport packets according to GOST 24597, GOST 21650.

Gross weight of overpack shall not exceed 1250 kg.

(Added, Rev. N 2).

5.4. To each of the coils of wire must be attached to the label, which indicate:

trademark or the name and trademark of manufacturer;

symbol;

the melting number.

5.5. Transport marking under GOST 14192.

5.6. Wire transporterowych by all kinds of transport in covered vehicles in accordance with cargo carriage regulations applicable to transport of this species. The placement and fastening of cargo in rail vehicles must comply with the technical conditions of loading and fastening of cargoes, approved by the Ministry of Railways of the USSR.

Transportation of the wire rail is held carload, small or low-tonnage shipments.

Allowed the transport of wire in universal containers according to GOST 15102,20435 GOST, GOST 22225.

5.7. Storage wire — on storage conditions 5 GOST 15150.

5.6, 5.7. (Changed edition, Rev. N 2).

5.8. Wire that is sent to the far North and equated to them, Packed and transported according to GOST 15846.

(Added, Rev. N 2).



The text of the document is verified by:
the official publication of the
Wire metal. Part 1:
SB. Standards. — M.: IPK Publishing house of standards, 2003