Minimal Match — 35% match
based on chemical composition and mechanical property overlap.
IS 3431 65Si7 (IS 3431:1982) and IS 3431 50Cr4V2 (IS 3431:1982) are both steel grades.
Both fall under the Spring Steel category.
IS 3431 65Si7 is typically used for volute, helical and laminated springs for automotive suspension; hot-rolled (also centreless ground or precision) bars and flats (clause 1.1), while IS 3431 50Cr4V2 is commonly used for valve springs,high performance automotive springs,aerospace springs,coil springs,torsion bars.
IS 3431 65Si7 is defined under Bureau of Indian Standards (IS), originating from India, while IS 3431 50Cr4V2 is defined under Bureau of Indian Standards (IS), originating from India.
As per chemical composition, IS 3431 65Si7 vs IS 3431 50Cr4V2 is a 63.9% match.
As per mechanical properties, the match is 100%.
Combined, this makes them a minimal match overall at 35%.
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
IS 3431 50Cr4V2
Core Hardness After Quenching
>=54 HRC (oil, up to 25 mm round / 16 mm flat)
>=54 HRC (oil, up to 25 mm round / 16 mm flat)
Elongation (quenched and tempered)
>=6%
>=6%
Hardness, soft annealed
<=255 HB
<=245 HB
Hardness, untreated (hot rolled)
about 310 HB (reference value)
above 310 HB (reference value)
Tensile Strength (quenched and tempered)
1370-1620 MPa
1370-1620 MPa
Yield Stress (quenched and tempered)
>=1180 MPa
>=1180 MPa
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)
IS 3431 50Cr4V2 specifies Cr, V which are not specified for IS 3431 65Si7.
Can IS 3431 65Si7 Be Substituted With IS 3431 50Cr4V2?
IS 3431 65Si7 and IS 3431 50Cr4V2 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
What is the difference between IS 3431 65Si7 and IS 3431 50Cr4V2?
IS 3431 50Cr4V2 specifies Cr, V which are not specified for IS 3431 65Si7.
Can IS 3431 65Si7 be substituted with IS 3431 50Cr4V2?
IS 3431 65Si7 and IS 3431 50Cr4V2 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.