Strong Match — 88.7% match
based on chemical composition and mechanical property overlap.
IS 3431 65Si7 (IS 3431:1982) and BS 970 EN45A (BS 970:1955) are both steel grades.
Both fall under the Spring Steel category.
IS 3431 65Si7 is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 EN45A is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, IS 3431 65Si7 vs BS 970 EN45A is a 88.7% match.
Mechanical property data is not available for both grades, so this factor could not be scored.
Combined, this makes them a strong match overall at 88.7%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
IS 3431 65Si7
BS 970 EN45A
Core Hardness After Quenching
>=54 HRC (oil, up to 25 mm round / 16 mm flat)
Not specified
Elongation (quenched and tempered)
>=6%
Not specified
Hardness, soft annealed
<=255 HB
Not specified
Hardness, untreated (hot rolled)
about 310 HB (reference value)
Not specified
Tensile Strength (quenched and tempered)
1370-1620 MPa
Not specified
Yield Stress (quenched and tempered)
>=1180 MPa
Not specified
Typical Applications
IS 3431 65Si7
Volute, helical and laminated springs for automotive suspension; hot-rolled (also centreless ground or precision) bars and flats (clause 1.1)
BS 970 EN45A
Not documented
Can IS 3431 65Si7 Be Substituted With BS 970 EN45A?
IS 3431 65Si7 and BS 970 EN45A overlap closely enough on chemistry and mechanical properties that BS 970 EN45A is often considered as a substitute for IS 3431 65Si7 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
What is the difference between IS 3431 65Si7 and BS 970 EN45A?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can IS 3431 65Si7 be substituted with BS 970 EN45A?
IS 3431 65Si7 and BS 970 EN45A overlap closely enough on chemistry and mechanical properties that BS 970 EN45A is often considered as a substitute for IS 3431 65Si7 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.