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
S
P
0.65-0.85
<=0.30
<=0.75
<=0.040
<=0.040
More data from BS 970:1955
From the standard
Notes
Note
By agreement between purchaser and manufacturer steel to En 49D may be supplied with sulphur and phosphorus contents each 0.030 per cent max.
Source: BS 970:1955, Part 2, En 49D
Status in the 1955 edition
Status
Deleted by Amendment 10
Reason
Amendment 10 (Jun 1972): spring steels moved to BS 970 Part 5:1972
BS 970:1955 was amended up to Amendment 10 (June 1972); steels were moved to the revised Parts 1 to 5 and deleted from this edition.
Source: BS 970:1955, Amendment slips 6 to 10
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