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BS 7612:1993

Current

Current

The latest, up-to-date edition.

Specification for non-circular steel wire for mechanical springs

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

15-02-1993

€165.94
Excluding VAT

Committees responsible
Foreword
Specification
1. Scope
2. References
3. Definitions
4. Information and requirements to be agreed and
     to be documented
5. Manufacture
6. Dimensions and tolerances
7. Bend requirements
8. Hardness requirements
9. Freedom from defects in finished wire
10. Mechanical testing
11. Examination for defects
12. Retests
13. Packing and identification
Annex
A. (normative) Product analysis and permitted
     variations
Tables
1. Quality codes and wire applications
2. Chemical compositions and ranges (cast analysis)
3. Condition of finished wire
4. Helix set test
5. Edge bow tolerances
6. Tolerances on characteristic dimensions
7. Tolerances on length of straight lengths
8. Surface defect limits
9. Decarburization limits for carbon and low alloy
     steel grades
10. Material densities
11. Minimum surface hardness requirements
A.1 Permitted variation of product analysis from
     specified range
Figures
1. Cross sections of typical non-circular wire shapes
     indicating characteristic dimensions
2. Edge profiles
3. Coil curvature
4. Edge bow
5. Bed test
6. Final position of wire after the bend test where
     b > t
List of references

Specifies dimensional tolerances.

Committee
ISE/106
DevelopmentNote
Supersedes 89/40727 DC (10/2005) Reviewed and confirmed by BSI, January 2011. (12/2010)
DocumentType
Standard
Pages
22
PublisherName
British Standards Institution
Status
Current

This British Standard specifies the requirements for steel wires of non-circular section supplied in coils or straight lengths, suitable for the manufacture of mechanical springs. It covers flattened, rectangular, square and trapezoidal (also termed keystone or tapered) section wires with square or rounded edges, and special cross section wires, up to a maximum characteristic dimension of 12.0 mm. The standard covers grades of carbon steel in the annealed, prehardened and tempered, cold drawn or cold rolled conditions including music wire, grades of alloy steel in the annealed and prehardened and tempered conditions, and grades of cold drawn or rolled stainless steel.

In addition to the definitive requirements, this standard also requires the items detailed in clause 4 to be documented. For compliance with this standard, both the definitive requirements and the documented items have to be satisfied.

NOTE. The grades of steel wire specified in this standard have been selected from those specified in BS 1429, BS 2056, BS 2803, and BS 5216.

BS 2056:1991 Specification for stainless steel wire for mechanical springs
BS 1837:1970 Methods for the sampling of iron, steel, permanent magnet alloys and ferro-alloys
BS HDBK19(1970) : LATEST METHODS FOR SAMPLING AND ANALYSIS OF IRON, STEEL AND OTHER FERROUS METALS
BS 6617-1:1985 Determination of decarburization in steel Methods for determining decarburization by microscopic and micro-hardness techniques
BS 5216:1991 Specification for patented cold drawn steel wire for mechanical springs
BS 4545:1970 Methods for mechanical testing of steel wire
BS 427:1990 Method for Vickers hardness test and for verification of Vickers hardness testing machines
BS EN 10002-1:2001 Tensile testing of metallic materials Method of test at ambient temperature

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