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IS 1570 (Part 4) 65Si7 vs IS 3431 65Si7

Strong Match — 99.4% match based on chemical composition and mechanical property overlap.

IS 1570 (Part 4) 65Si7 (IS 1570 (Part 4):1988) and IS 3431 65Si7 (IS 3431:1982) are both steel grades. Both fall under the Spring Steel category. IS 1570 (Part 4) 65Si7 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 1570 (Part 4) 65Si7 vs IS 3431 65Si7 is a 99.4% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a strong match overall at 99.4%.

Frequently Compared With IS 1570 (Part 4) 65Si7:
IS 3431 55Si7 IS 1570 (Part 4) 60Si7 IS 3431 60Si7 IS 4367 55Si7 IS 3195 113C6 IS 1570 (Part 4) 55Si7 EN 10089 55Si7 IS 3195 55Si7 IS 3195 60Si7 IS 3195 65Si7 EN 10089 55Cr3 IS 3195 98C6
Match Breakdown
CHEMISTRY MATCH
99.4%
MECHANICAL MATCH
No shared data
OVERALL
99.4%
Specifications
Property IS 1570 (Part 4) 65Si7 IS 3431 65Si7
Standard IS 1570 (Part 4):1988 IS 3431:1982
Category Spring Steel Spring Steel
C (%) 0.60-0.70 0.60-0.70
Si (%) 1.50-2.00 1.50-2.00
Mn (%) 0.80-1.00 0.80-1.00
P (%) Not specified <=0.045
S (%) Not specified <=0.045
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property IS 1570 (Part 4) 65Si7 IS 3431 65Si7
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 1570 (Part 4) 65Si7
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)
Key Differences
Can IS 1570 (Part 4) 65Si7 Be Substituted With IS 3431 65Si7?
IS 1570 (Part 4) 65Si7 and IS 3431 65Si7 overlap closely enough on chemistry and mechanical properties that IS 3431 65Si7 is often considered as a substitute for IS 1570 (Part 4) 65Si7 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
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IS 1570 (Part 4) 65Si7
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IS 3431 65Si7
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Frequently Asked Questions
What is the difference between IS 1570 (Part 4) 65Si7 and IS 3431 65Si7?
IS 3431 65Si7 specifies P, S which are not specified for IS 1570 (Part 4) 65Si7.
Can IS 1570 (Part 4) 65Si7 be substituted with IS 3431 65Si7?
IS 1570 (Part 4) 65Si7 and IS 3431 65Si7 overlap closely enough on chemistry and mechanical properties that IS 3431 65Si7 is often considered as a substitute for IS 1570 (Part 4) 65Si7 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.