Minimal Match — 35% match
based on chemical composition and mechanical property overlap.
IS 3431 65Si7 (IS 3431:1982) and EN 10083-1 51CrV4 (EN 10083-1:1991) 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 EN 10083-1 51CrV4 is commonly used for quenched and tempered machine parts; non alloy steels also normalized (clause 1).
IS 3431 65Si7 is defined under Bureau of Indian Standards (IS), originating from India, while EN 10083-1 51CrV4 is defined under European Standard (EN), originating from Europe.
As per chemical composition, IS 3431 65Si7 vs EN 10083-1 51CrV4 is a 65.4% match.
As per mechanical properties, the match is 0%.
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
EN 10083-1 51CrV4
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
Condition
Not specified
Quenched and tempered, ruling section d <= 16 mm
Elongation
Not specified
9% min
Hardness
Not specified
Soft annealed: 248 HB max
Tensile Strength
Not specified
1100 to 1300 MPa
Yield Strength
Not specified
900 MPa min
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)
EN 10083-1 51CrV4
Quenched and tempered machine parts; non alloy steels also normalized (clause 1)
Key Differences
EN 10083-1 51CrV4 specifies Cr, V which are not specified for IS 3431 65Si7.
Can IS 3431 65Si7 Be Substituted With EN 10083-1 51CrV4?
IS 3431 65Si7 and EN 10083-1 51CrV4 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 EN 10083-1 51CrV4?
EN 10083-1 51CrV4 specifies Cr, V which are not specified for IS 3431 65Si7.
Can IS 3431 65Si7 be substituted with EN 10083-1 51CrV4?
IS 3431 65Si7 and EN 10083-1 51CrV4 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.