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
0.24-0.32
1.00-1.40
<=0.050
<=0.050
More data from BS 970 (Part 1):1983
From the standard
Other composition limits
Silicon
Not specified for this grade; a maximum silicon content can be agreed between purchaser and supplier (Table 2, note 5)
Phosphorus and sulphur
Each 0.050 max (clause 1.7.2.1, carbon and carbon manganese steels)
Values as printed in Table 2 for the limiting ruling section shown.
Source: BS 970 (Part 1):1983, Table 2 and Table 3
Comparison with earlier editions
BS 970:1970/72 designation
120M28
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
Normalizing temperature
Normalizing temperature (C)
850-880
Table 3, category 1.
Source: BS 970 (Part 1):1983, Table 3
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