BS 7612:1993
Current
The latest, up-to-date edition.
Specification for non-circular steel wire for mechanical springs
Hardcopy , PDF
English
15-02-1993
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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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