Strong Match — 92.6% match
based on chemical composition and mechanical property overlap.
IS 3431 60Si7 (IS 3431:1982) and IS 3431 65Si7 (IS 3431:1982) are both steel grades.
Both fall under the Spring Steel category.
IS 3431 60Si7 is typically used for heavy duty leaf springs,suspension springs,automotive springs,railway springs,high stress spring components, while IS 3431 65Si7 is commonly used for volute, helical and laminated springs for automotive suspension; hot-rolled (also centreless ground or precision) bars and flats (clause 1.1).
IS 3431 60Si7 is defined under Bureau of Indian Standards (IS), originating from India, while IS 3431 65Si7 is defined under Bureau of Indian Standards (IS), originating from India.
As per chemical composition, IS 3431 60Si7 vs IS 3431 65Si7 is a 94.4% match.
As per mechanical properties, the match is 88.9%.
Combined, this makes them a strong match overall at 92.6%.
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 60Si7
IS 3431 65Si7
Core Hardness After Quenching
>=54 HRC (oil, up to 20 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
<=255 HB
Hardness, untreated (hot rolled)
about 310 HB (reference value)
about 310 HB (reference value)
Tensile Strength (quenched and tempered)
1320-1570 MPa
1370-1620 MPa
Yield Stress (quenched and tempered)
>=1130 MPa
>=1180 MPa
Typical Applications
IS 3431 60Si7
heavy duty leaf springs,suspension springs,automotive springs,railway springs,high stress spring components
IS 3431 65Si7
Volute, helical and laminated springs for automotive suspension; hot-rolled (also centreless ground or precision) bars and flats (clause 1.1)
Can IS 3431 60Si7 Be Substituted With IS 3431 65Si7?
IS 3431 60Si7 and IS 3431 65Si7 overlap closely enough on chemistry and mechanical properties that IS 3431 65Si7 is often considered as a substitute for IS 3431 60Si7 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 60Si7 and IS 3431 65Si7?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can IS 3431 60Si7 be substituted with IS 3431 65Si7?
IS 3431 60Si7 and IS 3431 65Si7 overlap closely enough on chemistry and mechanical properties that IS 3431 65Si7 is often considered as a substitute for IS 3431 60Si7 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.