Chemical compositions of stainless steels to BS 6258

Introduction

BS 6258, Hollow steel bars for machining, was published in 1988 and includes a range of ferritic, martensitic and austenitic stainless steel hollow bars for supply in either the hot or cold finished condition. The 'bars' (essentially thick walled tubes) must be seamless to comply with BS 6258.
The standard is withdrawn. Stainless steel hollow bar products are now covered by EN Standard 10294 part 2 published in 2012.

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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 6258 chemical composition table

Grade Chemical composition (% by mass - max unless stated)
. C Si Mn P S Cr Mo Ni Others
Ferritic steels
403S17 0.08 1.00 1.00 0.040 0.030 12.0/14.0 - 0.50 -
 
430S17 0.08 1.00 1.00 0.040 0.030 16.0/18.0 - 0.50 -
Martensitic steels
410S21 0.09/0.15 1.00 1.00 0.040 0.030 11.5/13.5 - 1.00 -
420S29 0.14/0.20 1.00 1.00 0.040 0.030 11.5/13.5 - 1.00 -
420S37 0.20/0.28 1.00 1.00 0.040 0.030 12.0/14.0 - 1.00 -
431S29 0.12/0.20 1.00 1.00 0.040 0.030 15.0/18.0 - 2.00/3.00 -
Austenitic steels
303S31 0.12 1.00 2.00 0.060 17.0/19.0 1.00 8.00/10.0  
302S31 0.12 1.00 2.00 0.045 0.030 17.0/19.0 - 8.00/10.0 -
304S11 0.030 1.00 2.00 0.045 0.030 17.0/19.0 - 9.00/12.0 -
304S15 0.06 1.00 2.00 0.045 0.030 17.5/19.0 - 8.00/11.0 -
304S31 0.07 1.00 2.00 0.045 0.030 17.0/19.0 - 8.00/11.0 -
321S31 0.08 1.00 2.00 0.045 0.030 17.0/19.0 - 9.00/12.0 Ti 5C/0.80
 
347S31 0.08 1.00 2.00 0.045 0.030 17.0/19.0 - 9.00/12.0 Nb 10C/1.00
 
316S11 0.030 1.00 2.00 0.045 0.030 16.5/18.5 2.0/2.50 11.00/14.0 -
316S13 0.030 1.00 2.00 0.045 0.030 16.5/18.5 2.5/3.00 11.5/14.5 -
316S31 0.07 1.00 2.00 0.045 0.030 16.5/18.5 2.0/2.50 10.5/13.5 -
316S33 0.07 1.00 2.00 0.045 0.030 16.5/18.5 2.5/3.00 11.0/14.0 -
320S31 0.08 1.00 2.00 0.045 0.030 16.5/18.5 2.0/2.50 11.0/14.0 Ti 5C/0.80
 
310S31 0.15 1.50 2.00 0.045 0.030 24.0/26.0 - 19.0/22.0 -

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