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
Cr
0.95-1.10
0.40-0.70
<=0.035
<=0.040
1.20-1.60
More data from BS 970 (Part 1):1983
From the standard
Other composition limits
Steel group
Alloy steel (Table 6)
Silicon
Not specified in Table 6
Phosphorus and sulphur
Phosphorus 0.035 max, sulphur 0.040 max (clause 1.7.2.1, alloy steels)
Only the chemical composition was loaded; Table 6 prints no mechanical property rows for this grade.
Source: BS 970 (Part 1):1983, Table 6 and clause 1.7.2.1
Hardness, softened condition
Hardness HB
229 max (when supplied in the softened condition, note 19)
Source: BS 970 (Part 1):1983, Table 6
Comparison with earlier editions
BS 970:1970/72 designation
535A99
BS 970:1955 En No.
31
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.