GOST R 50567-93

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  ГОСТ Р 50567-93

GOST R 50567−93 (ISO 8458−2-89) steel Wire for mechanical springs cold-drown carbon steel

GOST R 50567−93
(ISO 8458−2-89)

Group V72

STATE STANDARD OF THE RUSSIAN FEDERATION

STEEL WIRE
FOR MECHANICAL SPRINGS COLD-DROWN
CARBON STEEL

Steel wire for mechanical
springs cold-drown carbon steel

ISS 77.140.65
OKP 12 2100

Date of introduction 1994−07−01

INFORMATION DATA

1 DEVELOPED AND SUBMITTED by the Technical Committee for standardization TC 146 «Hardware"

2 APPROVED AND put INTO effect by the Resolution of Gosstandart of Russia from April 29, 1993 N 131

This standard developed by the direct application of international standard ISO 8458−2-89 «steel Wire for mechanical springs. Part 2. Wire cold drawn carbon steel» with additional requirements that reflect the needs of the national economy

3 INTRODUCED FOR THE FIRST TIME

4 REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

5. REISSUE

1 Purpose and scope

This standard specifies requirements for cold-drawn wire of carbon steel, intended for the manufacture of mechanical springs subjected to static and dynamic loads, General requirements of GOST R 50566.

The area of allowable values of the diameters and strength levels, the wire correspond to the two types of modes, are given in table 1. For types SH, DM, DN the diameter tolerances of class A, and for types SL, SM class according to GOST R 50566.


Table 1

Additional requirements that reflect the needs of the economy, in italics.

2 Links

GOST R 50566−93 steel Wire for mechanical springs. General requirements

OST 14−15−193 hot round wire Rod of carbon steel of ordinary quality. Specifications

3 Laying the roll

3.1 Wire on a reel should be evenly laid. Sliced from the roll coil of wire must lie on a flat surface smooth, without signs of clotting in the spiral. By agreement between manufacturer and consumer requirements for the installation of a coil for wire dia less than 5.0 mm is considered fulfilled if a separate coil of wire taken from a coil or coils and freely hanging on a hook, has an axial offset of the ends of the coil , not exceeding the value specified by the formula

,

where  — the average diameter of the individual loop measured in a horizontal position;

 — nominal wire diameter.

4 appearance of the surface

In appearance the surface of the wire should be or light drawn (after the dry drawing) phosphated, bright drawn (after wet drawing) gray. By agreement between the manufacturer and the customer, polished.

By agreement with the consumer allowed other types of surface of wire (GOST 2333).

5 Chemical composition

5.1 Chemical composition of steel by ladle sample shall conform to the requirements of table 2.


Table 2

The analysis of the chemical composition of the wire shall be conducted in accordance with OST 14−15−193 or other methods providing the required accuracy of the analysis.

5.2 Chemical composition of the wire shall conform to the requirements of table 3.


Table 3

6 Temporary resistance

Temporary resistance wire must meet the requirements of table 4 depending on the nominal diameter and type of wire.


Table 4

7 torsion Testing

7.1 Test is subjected to twisting wire with a nominal diameter ranging from 0.70 to 6.00 mm, and in coordination with the consumer — in excess of 6.00 to 10.00 mm inclusive.

7.2 the Wire shall withstand without failure the number of twists shown in table 5, the estimated length equal to 100 wire diameters. If the calculated length is greater or less than 100 diameters, the number of twists should be adjusted proportionally to the change in the estimated length. The estimated length shall be as given in table 6.


Table 5

Table 6

7.3 the Test continued until fracture, the initial fracture must be perpendicular to the axis of the wire and the surface should not be cleaved. Allowed the formation of secondary fractures.

8 Test winding

8.1 Test winding is subjected to a wire with a nominal diameter of less than 0.70 mm.

8.2 the Wire shall not crack when thick wrapping four turns around a mandrel of diameter equal to the diameter of the wire.

9 bend Test

9.1 the bend Test subjected to the wire diameter of 6.00 mm. more

9.2 the Wire shall not crack when bent 90° around mandrel of diameter equal to two wire diameters.

10 Control of surface quality

10.1 quality Control of the surface is subjected to only the wire intended for the manufacture of springs subjected to dynamic load.

10.2 the Availability of complete decarburization in the cross section of the wire is not allowed. Partial decarburization, manifested in the form of ferrite at the grain boundaries in excess of the amount of ferrite in the main part of the section should not have a radial depth in excess of 1.5% of the nominal wire diameter.

10.3 Radial depth of cracks or other surface defects shall not exceed 1% of the nominal wire diameter.


The text of the document is verified by:
the official publication of the
Wire metal. Part 3: Sat. Standards. -
M.: IPK Publishing house of standards, 2003