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
V
S
P
0.45-0.55
<=0.50
0.50-0.80
0.80-1.20
>=0.15
<=0.050
<=0.050
Typical Available Sizes
Round Bar
16mm – 100mm dia
Flat Bar
20×6mm – 100×25mm
Spring Flat
3×20mm – 16×100mm
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.