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
Cr
S
P
0.45-0.55
0.10-0.50
0.50-0.80
1.00-1.40
<=0.050
<=0.050
Typical Available Sizes
Round Bar
10mm–75mm dia
Flat Bar
15×5mm–80×15mm
Sizes are indicative. Contact seller for exact availability.
More data from BS 970:1955
From the standard
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.