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JIS G4801 SUP9 vs EN 10089 55Si7

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

JIS G4801 SUP9 (JIS G 4801:2005) and EN 10089 55Si7 (EN 10089:2002) are both steel grades. Both fall under the Spring Steel category. JIS G4801 SUP9 is typically used for automotive leaf springs, suspension springs, while EN 10089 55Si7 is commonly used for leaf springs, coil springs, torsion bars. JIS G4801 SUP9 is defined under Japanese Industrial Standards (JIS), originating from Japan, while EN 10089 55Si7 is defined under European Standard (EN), originating from Europe.

As per chemical composition, JIS G4801 SUP9 vs EN 10089 55Si7 is a 79.9% match. As per mechanical properties, the match is 25%. 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 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 IS 1570 (Part 4) 55Si7
Match Breakdown
CHEMISTRY MATCH
79.9%
MECHANICAL MATCH
25%
OVERALL
35%
Specifications
Property JIS G4801 SUP9 EN 10089 55Si7
Standard JIS G 4801:2005 EN 10089:2002
Category Spring Steel Spring Steel
C (%) 0.52–0.60 0.51–0.59
Mn (%) 0.65–0.95 0.70–1.00
Cr (%) 0.65–0.95 Not specified
Si (%) 0.15–0.35 1.50–2.00
P (%) ≤0.030 ≤0.040
S (%) ≤0.030 ≤0.040
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 EN 10089 55Si7
Tensile Strength 1180 MPa min (oil hardened) 1000–1200 MPa
Yield Strength ≥1030 MPa ≥900 MPa
Elongation ≥7% ≥7%
Hardness 363–429 HB 285–363 HB
Typical Applications
JIS G4801 SUP9
Automotive leaf springs, suspension springs
EN 10089 55Si7
Leaf springs, coil springs, torsion bars
Key Differences
Can JIS G4801 SUP9 Be Substituted With EN 10089 55Si7?
JIS G4801 SUP9 and EN 10089 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)
EN 10089 55Si7
Round Bar → (3 listings)
Diameter: 30–30 mm (1.18–1.18 in)
Length: 4200–7000 mm (165.35–275.59 in)
On M-EX Right Now
JIS G4801 SUP9
4 active listings and RFQs →
EN 10089 55Si7
3 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4801 SUP9 and EN 10089 55Si7?
JIS G4801 SUP9 specifies Cr which is not specified for EN 10089 55Si7.
Can JIS G4801 SUP9 be substituted with EN 10089 55Si7?
JIS G4801 SUP9 and EN 10089 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.