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JIS G4801 SUP9 vs JIS G4801 SUP9A

Strong Match — 93.7% match based on chemical composition and mechanical property overlap.

JIS G4801 SUP9 (JIS G 4801:2005) and JIS G4801 SUP9A (JIS G 4801:2005) are both steel grades. Both fall under the Spring Steel category. JIS G4801 SUP9 is typically used for automotive leaf springs, suspension springs, while JIS G4801 SUP9A is commonly used for heavy duty leaf springs, torsion bars. JIS G4801 SUP9 is defined under Japanese Industrial Standards (JIS), originating from Japan, while JIS G4801 SUP9A is defined under Japanese Industrial Standards (JIS), originating from Japan.

As per chemical composition, JIS G4801 SUP9 vs JIS G4801 SUP9A is a 90.5% match. As per mechanical properties, the match is 100%. Combined, this makes them a strong match overall at 93.7%.

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
90.5%
MECHANICAL MATCH
100%
OVERALL
93.7%
Specifications
Property JIS G4801 SUP9 JIS G4801 SUP9A
Standard JIS G 4801:2005 JIS G 4801:2005
Category Spring Steel Spring Steel
C (%) 0.52–0.60 0.56–0.64
Mn (%) 0.65–0.95 0.70–1.00
Cr (%) 0.65–0.95 0.70–1.00
Si (%) 0.15–0.35 0.15–0.35
P (%) ≤0.030 ≤0.030
S (%) ≤0.030 ≤0.030
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 JIS G4801 SUP9A
Tensile Strength 1180 MPa min (oil hardened) ≥1180 MPa
Yield Strength ≥1030 MPa ≥1030 MPa
Elongation ≥7% ≥7%
Hardness 363–429 HB Not specified
Typical Applications
JIS G4801 SUP9
Automotive leaf springs, suspension springs
JIS G4801 SUP9A
Heavy duty leaf springs, torsion bars
Can JIS G4801 SUP9 Be Substituted With JIS G4801 SUP9A?
JIS G4801 SUP9 and JIS G4801 SUP9A overlap closely enough on chemistry and mechanical properties that JIS G4801 SUP9A is often considered as a substitute for JIS G4801 SUP9 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
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)
JIS G4801 SUP9A
Round Bar → (2 listings)
Diameter: 30–30 mm (1.18–1.18 in)
Length: 3700–5500 mm (145.67–216.54 in)
On M-EX Right Now
JIS G4801 SUP9
4 active listings and RFQs →
JIS G4801 SUP9A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4801 SUP9 and JIS G4801 SUP9A?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can JIS G4801 SUP9 be substituted with JIS G4801 SUP9A?
JIS G4801 SUP9 and JIS G4801 SUP9A overlap closely enough on chemistry and mechanical properties that JIS G4801 SUP9A is often considered as a substitute for JIS G4801 SUP9 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.