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JIS G4801 SUP9 vs GB/T 1222 55CrMnA

Related Material — 64.6% match based on chemical composition and mechanical property overlap.

JIS G4801 SUP9 (JIS G 4801:2005) and GB/T 1222 55CrMnA (GB/T 1222-2016) are both steel grades. Both fall under the Spring Steel category. JIS G4801 SUP9 is typically used for automotive leaf springs, suspension springs, while GB/T 1222 55CrMnA is commonly used for automotive leaf springs, coil springs. JIS G4801 SUP9 is defined under Japanese Industrial Standards (JIS), originating from Japan, while GB/T 1222 55CrMnA is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, JIS G4801 SUP9 vs GB/T 1222 55CrMnA is a 96.9% match. As per mechanical properties, the match is 0%. Combined, this makes them a related material overall at 64.6%.

Frequently Compared With JIS G4801 SUP9:
EN 10089 55Cr3 EN 10089 50CrV4 EN 10083-3 51CrV4 EN 10089 55Si7 IS 3431 50Cr4V2 IS 3195 113C6 IS 3195 50Cr4V2 EN 10083-1 51CrV4 IS 3195 52Cr4Mo2V EN 10083-1 51CrV4 IS 5517 55Cr3 IS 1570 (Part 4) 55Si7
Match Breakdown
CHEMISTRY MATCH
96.9%
MECHANICAL MATCH
0%
OVERALL
64.6%
Specifications
Property JIS G4801 SUP9 GB/T 1222 55CrMnA
Standard JIS G 4801:2005 GB/T 1222-2016
Category Spring Steel Spring Steel
C (%) 0.52–0.60 0.52–0.60
Mn (%) 0.65–0.95 0.70–1.00
Cr (%) 0.65–0.95 0.65–0.95
Si (%) 0.15–0.35 0.17–0.37
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 GB/T 1222 55CrMnA
Tensile Strength 1180 MPa min (oil hardened) ≥1225 MPa
Yield Strength ≥1030 MPa ≥1080 MPa
Elongation ≥7% ≥6%
Hardness 363–429 HB Not specified
Typical Applications
JIS G4801 SUP9
Automotive leaf springs, suspension springs
GB/T 1222 55CrMnA
Automotive leaf springs, coil springs
Key Differences
Can JIS G4801 SUP9 Be Substituted With GB/T 1222 55CrMnA?
JIS G4801 SUP9 and GB/T 1222 55CrMnA 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)
GB/T 1222 55CrMnA
Round Bar → (2 listings)
Diameter: 30–30 mm (1.18–1.18 in)
Length: 5600–7000 mm (220.47–275.59 in)
On M-EX Right Now
JIS G4801 SUP9
4 active listings and RFQs →
GB/T 1222 55CrMnA
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4801 SUP9 and GB/T 1222 55CrMnA?
JIS G4801 SUP9 specifies P, S which are not specified for GB/T 1222 55CrMnA.
Can JIS G4801 SUP9 be substituted with GB/T 1222 55CrMnA?
JIS G4801 SUP9 and GB/T 1222 55CrMnA 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.