Related Material — 67.1% match
based on chemical composition and mechanical property overlap.
IS 4367 55Si7 (IS 4367:1991) and IS 3431 65Si7 (IS 3431:1982) are both steel grades.
Both fall under the Spring Steel category.
IS 4367 55Si7 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 4367 55Si7 vs IS 3431 65Si7 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 4367 55Si7
IS 3431 65Si7
Tensile Strength
1300-1500 MPa
Not specified
Hardness
380-440 HB
Not specified
Hardness (soft annealed)
<=245 HB
Not specified
Condition
Hardened and tempered, ruling section up to 100 mm
Not specified
Core Hardness After Quenching
Not specified
>=54 HRC (oil, up to 25 mm round / 16 mm flat)
Elongation (quenched and tempered)
Not specified
>=6%
Hardness, soft annealed
Not specified
<=255 HB
Hardness, untreated (hot rolled)
Not specified
about 310 HB (reference value)
Tensile Strength (quenched and tempered)
Not specified
1370-1620 MPa
Yield Stress (quenched and tempered)
Not specified
>=1180 MPa
Typical Applications
IS 4367 55Si7
Not documented
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 4367 55Si7 Be Substituted With IS 3431 65Si7?
IS 4367 55Si7 and IS 3431 65Si7 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 4367 55Si7 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 4367 55Si7 be substituted with IS 3431 65Si7?
IS 4367 55Si7 and IS 3431 65Si7 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.