Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Si
Mn
P
S
Cr
Mo
Ni
<=0.07
<=1.0
<=2.0
<=0.045
<=0.030
16.5-18.5
2.50-3.00
11.0-14.0
More data from BS 970 (Part 1):1983
From the standard
Mechanical properties, softened condition
Softening temperature
1000-1100 deg C
Maximum section
160 mm
Rm min
510 N/mm2
A min
40 %
Rp0.2 min (when specifically ordered)
205 N/mm2
Rp1.0 min (when specifically ordered)
240 N/mm2
Sensitization period
15 min (see clause 1.15.6)
Hardness HB max (note 36)
183
All Table 14 steels are category 1. Note 36: straightening by reeling or cold rectification of austenitic steels can increase the surface hardness above the specified maximum. 1 N/mm2 = 1 MPa.
Source: BS 970 (Part 1):1983, Table 14
Mechanical properties, cold drawn condition
Section (mm)
Rm min (N/mm2)
A min (%)
Rp0.2 min (N/mm2)
Rp1.0 min (N/mm2)
<=19
865
12
695
725
>19 <=25
790
15
555
585
>25 <=32
725
20
450
480
>32 <=38
695
28
340
370
>38 <=45
650
28
310
340
Table 15 applies to austenitic stainless steels in the cold drawn condition (clause 1.13.4.1 (c)). 1 N/mm2 = 1 MPa.
Source: BS 970 (Part 1):1983, Table 15
Comparison with earlier editions
BS 970:1970/72 designation
Not listed
BS 970:1955 En No.
None
Appendix D note 47: where a comparison is made the steels are not necessarily equivalent. 'Not listed' means the earlier edition has no entry under this designation.
Source: BS 970 (Part 1):1983, Appendix D
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