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IS 3431 65Si7 vs BS 970 EN45

Strong Match — 89.3% match based on chemical composition and mechanical property overlap.

IS 3431 65Si7 (IS 3431:1982) and BS 970 EN45 (BS 970:1955) 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 BS 970 EN45 is commonly used for leaf springs, coil springs, automotive suspension. IS 3431 65Si7 is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 EN45 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, IS 3431 65Si7 vs BS 970 EN45 is a 89.3% 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 89.3%.

Frequently Compared With IS 3431 65Si7:
IS 3431 60Si7 IS 3431 55Si7 IS 1570 (Part 4) 60Si7 IS 1570 (Part 4) 65Si7 IS 3195 65Si7 EN 10083-1 51CrV4 IS 4367 55Si7 EN 10083-1 51CrV4 IS 3195 50Cr4V2 EN 10089 50CrV4 IS 3431 50Cr4V2 IS 1570 (Part 4) 55Si7
Match Breakdown
CHEMISTRY MATCH
89.3%
MECHANICAL MATCH
No shared data
OVERALL
89.3%
Specifications
Property IS 3431 65Si7 BS 970 EN45
Standard IS 3431:1982 BS 970:1955
Category Spring Steel Spring Steel
C (%) 0.60-0.70 0.50-0.60
Mn (%) 0.80-1.00 0.70-1.00
P (%) <=0.045 <=0.050
S (%) <=0.045 <=0.050
Si (%) 1.50-2.00 1.50-2.00
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 BS 970 EN45
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
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)
BS 970 EN45
Leaf springs, coil springs, automotive suspension
Can IS 3431 65Si7 Be Substituted With BS 970 EN45?
IS 3431 65Si7 and BS 970 EN45 overlap closely enough on chemistry and mechanical properties that BS 970 EN45 is often considered as a substitute for IS 3431 65Si7 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
IS 3431 65Si7
No active listings currently.
BS 970 EN45
Round Bar → (6 listings)
Diameter: 55–60 mm (2.17–2.36 in)
Length: 5200–6200 mm (204.72–244.09 in)
Flat Bar → (3 listings)
Thickness: 25–25 mm (0.98–0.98 in)
Width: 150–150 mm (5.91–5.91 in)
Length: 2500–3600 mm (98.43–141.73 in)
On M-EX Right Now
IS 3431 65Si7
0 active listings and RFQs →
BS 970 EN45
9 active listings and RFQs →
Frequently Asked Questions
What is the difference between IS 3431 65Si7 and BS 970 EN45?
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 BS 970 EN45?
IS 3431 65Si7 and BS 970 EN45 overlap closely enough on chemistry and mechanical properties that BS 970 EN45 is often considered as a substitute for IS 3431 65Si7 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.