Chemical composition of stainless steels to BS 1554

Introduction

BS 1554, Specification for stainless and heat-resisting steel round wire, was published in 1990. It covered a wide range of steel wire grades for supply essentially in the annealed condition.
The standard was withdrawn in 2005 following the re-publication of BS EN 10088-3:2005, which now covers wire products. BS 1554 should not be used for specifying new products, but may still be included specifications for products originally designed before 2005 and so is included here for reference purposes only.

Stainless steel wire for springs is covered by BS EN 10270-3

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The data given is not intended to replace that shown in individual standards to which reference should always be made.

BS 1554 chemical composition table

Grade
Chemical composition (% by mass - max unless stated)
. C Si Mn S P Cr Ni Mo Others
430S18 0.10 1.00 1.00 0.030 0.040 16.0/18.0 1.00 - -
430S11 0.03 1.00 1.00 0.030 0.040 16.0/18.0 1.00 - -
434S20 0.12 1.00 1.00 0.030 0.040 16.0/18.0 - 0.75/1.25 -
436S20 0.12 1.00 1.00 0.030 0.040 16.0/18.0 - 0.75/1.25 Nb 5C/0.70
410S21 0.09/0.15 1.00 1.00 0.030 0.040 11.5/13.5 1.00 - -
416S21 0.09/0.15 1.00 1.50 0.15/0.35 0.060 11.5/14.0 1.00 0.60 -
416S41 0.09/0.15 1.00 1.50 0.060 0.060 11.5/13.5 1.00 0.60 Se 0.15/0.35
420S29 0.14/0.20 1.00 1.00 0.030 0.040 11.5/13.5 1.00 - -
420S37 0.20/0.28 1.00 1.00 0.030 0.040 12.0/14.0 1.00 - -
420S45 0.28/0.36 1.00 1.00 0.030 0.040 12.0/14.0 1.00 - -
431S29 0.12/0.20 1.00 1.00 0.030 0.040 15.0/18.0 2.0/3.0 - -
441S49 0.12/0.20 1.00 1.50 0.030 0.040 15.0/18.0 2.0/3.0 0.60 Se 0.15/0.35
202S16 0.15 1.00 7.5/10.0 0.030 0.060 17.0/19.0 4.0/6.0 - N 0.25
301S22 0.15 1.00 2.00 0.030 0.045 16.0/18.0 6.5/9.0 0.80 -
302S31 0.12 1.00 2.00 0.030 0.045 17.0/19.0 8.0/10.0 - -
303S31 0.12 1.00 2.00 0.15/0.35 0.060 17.0/19.0 8.0/10.0 1.00 -
303S42 0.12 1.00 2.00 0.060 0.060 17.0/19.0 8.0/10.0 1.00 Se 0.15/0.35
304S11 0.03 1.00 2.00 0.030 0.045 17.0/19.0 9.0/12.0 - -
304S15 0.06 1.00 2.00 0.030 0.045 17.5/19.0 8.0/11.0 - -
304S31 0.07 1.00 2.00 0.030 0.045 17.0/19.0 8.0/11.0 - -
305S11 0.03 1.00 2.00 0.030 0.045 17.0/19.0 11.0/13.0 - -
309S20 0.12 1.00 2.00 0.030 0.045 22.0/25.0 12.0/15.0 - -
310S25 0.15 1.50 2.50 0.030 0.045 25.0/28.0 20.0/22.5 - -
314S25 0.25 1.50/3.00 2.50 0.030 0.045 23.0/26.0 19.0/22.0 - -
316S11 0.03 1.00 2.00 0.030 0.045 16.0/18.5 10.0/14.0 2.00/3.00 -
316S19 0.07 1.00 2.00 0.030 0.045 16.0/18.5 10.0/14.0 2.00/3.00 -
316S33 0.07 1.00 2.00 0.030 0.045 16.5/18.5 11.0/14.0 2.50/3.00 -
317S11 0.03 1.00 2.00 0.030 0.045 18.0/20.0 12.0/15.0 3.00/4.00 -
317S17 0.08 1.00 2.00 0.030 0.045 18.0/20.0 12.0/15.0 3.00/4.00 -
318S17 0.08 1.00 2.00 0.030 0.045 18.0/20.0 11.0/14.0 2.00/3.00 Nb 10C/1.00
320S18 0.08 1.00 2.00 0.030 0.045 16.5/18.5 10.5/13.5 2.00/2.50 Ti 5C/0.80
321S31 0.08 1.00 2.00 0.030 0.045 17.0/19.0 9.0/12.0 - Ti 5C/0.80
325S31 0.12 1.00 2.00 0.15/0.35 0.060 17.0/19.0 8.0/11.0 0.70 Ti 5C/0.90
326S42 0.12 1.00 2.00 0.060 0.060 16.5/18.5 10.0/13.0 2.25/3.00 Se 0.15/0.35
347S20 0.08 1.00 2.00 0.030 0.045 17.0/21.0 9.0/12.0 - Nb 10C/1.00
394S17 0.07 1.00 2.00 0.030 0.045 17.0/19.0 8.0/10.5 - Cu 3.00/4.00
904S14 0.03 1.00 2.00 0.030 0.040 19.5/22.0 24.0/27.0 4.00/5.00 Cu 1.00/2.00 N 0.06
22.8.3.L 0.03 1.00 2.00 0.030 0.045 21.5/23.5 7.0/9.0 2.80/3.80 N 0.07/0.15

Table Notes
For maximum work hardening the nickel content for type 301S22 should be specified as 6.0% to 8.0%.
For 304S11 wire diameters 0.08mm and less the minimum nickel content is 8.0%.
For 410S21 wire diameter 0.08mm and less the maximum carbon content is 0.08%.
For wire less than 0.10mm in diameter, the maximum tensile strength should be agreed between purchaser and manufacturer.

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