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JIS G4801 SUP9 vs IS 1570 (Part 4) 55Si7

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

JIS G4801 SUP9 (JIS G 4801:2005) and IS 1570 (Part 4) 55Si7 (IS 1570 (Part 4):1988) are both steel grades. Both fall under the Spring Steel category. JIS G4801 SUP9 is defined under Japanese Industrial Standards (JIS), originating from Japan, while IS 1570 (Part 4) 55Si7 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, JIS G4801 SUP9 vs IS 1570 (Part 4) 55Si7 is a 78.5% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With JIS G4801 SUP9:
EN 10089 55Cr3 EN 10089 50CrV4 EN 10083-3 51CrV4 EN 10089 55Si7 GB/T 1222 55CrMnA IS 3431 50Cr4V2 IS 3195 113C6 IS 3195 50Cr4V2 EN 10083-1 51CrV4 EN 10083-1 51CrV4 IS 3195 52Cr4Mo2V IS 5517 55Cr3
Match Breakdown
CHEMISTRY MATCH
78.5%
MECHANICAL MATCH
No shared data
OVERALL
35%
Specifications
Property JIS G4801 SUP9 IS 1570 (Part 4) 55Si7
Standard JIS G 4801:2005 IS 1570 (Part 4):1988
Category Spring Steel Spring Steel
C (%) 0.52–0.60 0.50-0.60
Mn (%) 0.65–0.95 0.80-1.00
Cr (%) 0.65–0.95 Not specified
Si (%) 0.15–0.35 1.50-2.00
P (%) ≤0.030 Not specified
S (%) ≤0.030 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property JIS G4801 SUP9 IS 1570 (Part 4) 55Si7
Tensile Strength 1180 MPa min (oil hardened) Not specified
Yield Strength ≥1030 MPa Not specified
Elongation ≥7% Not specified
Hardness 363–429 HB Not specified
Typical Applications
JIS G4801 SUP9
Automotive leaf springs, suspension springs
IS 1570 (Part 4) 55Si7
Not documented
Key Differences
Can JIS G4801 SUP9 Be Substituted With IS 1570 (Part 4) 55Si7?
JIS G4801 SUP9 and IS 1570 (Part 4) 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.
Forms & Sizes Available on M-EX
JIS G4801 SUP9
Round Bar → (4 listings)
Diameter: 30–35 mm (1.18–1.38 in)
Length: 3900–6700 mm (153.54–263.78 in)
IS 1570 (Part 4) 55Si7
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On M-EX Right Now
JIS G4801 SUP9
4 active listings and RFQs →
IS 1570 (Part 4) 55Si7
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Frequently Asked Questions
What is the difference between JIS G4801 SUP9 and IS 1570 (Part 4) 55Si7?
JIS G4801 SUP9 specifies Cr, P, S which are not specified for IS 1570 (Part 4) 55Si7.
Can JIS G4801 SUP9 be substituted with IS 1570 (Part 4) 55Si7?
JIS G4801 SUP9 and IS 1570 (Part 4) 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.