Related Material — 67.1% match
based on chemical composition and mechanical property overlap.
IS 3431 65Si7 (IS 3431:1982) and IS 4367 55Si7 (IS 4367:1991) 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 IS 4367 55Si7 is defined under Bureau of Indian Standards (IS), originating from India.
As per chemical composition, IS 3431 65Si7 vs IS 4367 55Si7 is a 90.4% match.
As per mechanical properties, the match is 20.3%.
Combined, this makes them a related material overall at 67.1%.
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 4367 55Si7
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
Tensile Strength
Not specified
1300-1500 MPa
Hardness
Not specified
380-440 HB
Hardness (soft annealed)
Not specified
<=245 HB
Condition
Not specified
Hardened and tempered, ruling section up to 100 mm
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 4367 55Si7
Not documented
Can IS 3431 65Si7 Be Substituted With IS 4367 55Si7?
IS 3431 65Si7 and IS 4367 55Si7 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 4367 55Si7?
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 IS 4367 55Si7?
IS 3431 65Si7 and IS 4367 55Si7 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.