Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Mn
P
S
0.07-0.13
0.30-0.60
<=0.050
<=0.050
More data from BS 970 (Part 1):1983
From the standard
Other composition limits
Phosphorus and sulphur
Each 0.050 max (clause 1.7.2.1, carbon and carbon manganese steels)
Residual elements: see clause 1.7.3.
Source: BS 970 (Part 1):1983, Table 11
Mechanical properties, test bar
Test bar diameter (mm)
Rm min (N/mm2)
A min (%)
Izod min (ft lbf)
KCV min (J)
13
430
18
35
42
19 (note 28, preferred size)
430
18
35
42
Values as printed in Table 11 for the test bar diameter shown. 1 N/mm2 = 1 MPa.
Source: BS 970 (Part 1):1983, Table 11
Heat treatment and maximum hardness
Hardening temperature
900-930 deg C
Table 12 gives no maximum hardness for this steel.
Source: BS 970 (Part 1):1983, Table 12
Comparison with earlier editions
BS 970:1970/72 designation
045M10
BS 970:1955 En No.
32A
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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