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JIS G4801 SUP9 vs BS 970 EN48A

Related Material — 69.9% match based on chemical composition and mechanical property overlap.

JIS G4801 SUP9 (JIS G 4801:2005) and BS 970 EN48A (BS 970:1955) are both steel grades. Both fall under the Spring Steel category. JIS G4801 SUP9 is typically used for automotive leaf springs, suspension springs, while BS 970 EN48A is commonly used for bars for oil hardening and tempering. laminated spring plates to this specification shall conform to the dimensional requirements in appendix c.. JIS G4801 SUP9 is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 EN48A is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, JIS G4801 SUP9 vs BS 970 EN48A is a 84.2% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 69.9%.

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
84.2%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property JIS G4801 SUP9 BS 970 EN48A
Standard JIS G 4801:2005 BS 970:1955
Category Spring Steel Spring Steel
C (%) 0.52–0.60 0.50-0.60
Mn (%) 0.65–0.95 0.60-0.90
Cr (%) 0.65–0.95 0.55-0.85
Si (%) 0.15–0.35 1.35-1.65
P (%) ≤0.030 <=0.050
S (%) ≤0.030 <=0.050
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 BS 970 EN48A
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
BS 970 EN48A
Bars for oil hardening and tempering. Laminated spring plates to this specification shall conform to the dimensional requirements in Appendix C.
Can JIS G4801 SUP9 Be Substituted With BS 970 EN48A?
JIS G4801 SUP9 and BS 970 EN48A 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)
BS 970 EN48A
No active listings currently.
On M-EX Right Now
JIS G4801 SUP9
4 active listings and RFQs →
BS 970 EN48A
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4801 SUP9 and BS 970 EN48A?
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 BS 970 EN48A?
JIS G4801 SUP9 and BS 970 EN48A 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.