BS 5770-4:1981

Foreword
Cooperating organizations
Specification
1 Scope
2 References
3 Definitions
4 Designation systems
5 Form of supply
6 Information to be supplied by the purchaser
7 Steelmaking process
8 Chemical composition
9 Mechanical properties
10 Edge conditions
11 Skin pass
12 Surface finish
13 Dimensional tolerances
14 Freedom from defects
15 Non-metallic inclusions
16 Number of tests
17 Hardness test
18 Bend test
19 Retests
20 Test certificates
21 Inspection
22 Packaging and identification
Tables
1 Chemical composition
2 Permitted variation of product analysis from
    specified range of cast analysis
3 Hardness values
4 Bend test requirements
5 Tolerances on thickness
6 Tolerances on width in the mill edge condition (E2)
7 Tolerances on width in the sheared or slit edge
    condition (E3) for all widths up to and including
    450 mm; also in the dressed edge condition (E1)
    where available
8 Tolerances on length of cut lengths
9 Maximum edge camber
10 Maximum deviations from flatness of cut lengths
Figures
1 Edge camber
2 Flatness of strip
3 Bend test A
4 Bend test B

Defines the requisites for cold rolled martensitic and austenitic stainless steel strip for the manufacture of springs. Relates to material from 0.1 mm to 5 mm inclusive in thickness and from 3.15 mm to 450 mm inclusive in width and austenitic steels 301S21, 302S25 and 316S16 provided in one of five temper rolled conditions, having any one of four edge conditions and with any one of three surface finishes. Also included are martensitic steels 420S29 and 420S45 provided in one of two conditions, having one of four edge conditions, and a single surface finish. Included are sections on steelmaking, chemical composition, mechanical properties, edge conditions, skin pass and surface finish.