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BS 970 EN48A vs JIS G4801 SUP9

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

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

As per chemical composition, BS 970 EN48A vs JIS G4801 SUP9 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 BS 970 EN48A:
IS 5517 55Cr3 EN 10083-3 51CrV4 EN 10089 55Cr3 GB/T 1222 55CrMnA IS 3195 113C6 IS 3431 50Cr4V2 IS 3195 50Cr4V2 EN 10089 50CrV4 EN 10083-1 51CrV4 EN 10083-1 51CrV4 IS 3195 52Cr4Mo2V IS 1570 (Part 4) 55Si7
Match Breakdown
CHEMISTRY MATCH
84.2%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property BS 970 EN48A JIS G4801 SUP9
Standard BS 970:1955 JIS G 4801:2005
Category Spring Steel Spring Steel
C (%) 0.50-0.60 0.52–0.60
Si (%) 1.35-1.65 0.15–0.35
Mn (%) 0.60-0.90 0.65–0.95
Cr (%) 0.55-0.85 0.65–0.95
S (%) <=0.050 ≤0.030
P (%) <=0.050 ≤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 BS 970 EN48A JIS G4801 SUP9
Tensile Strength Not specified 1180 MPa min (oil hardened)
Yield Strength Not specified ≥1030 MPa
Elongation Not specified ≥7%
Hardness Not specified 363–429 HB
Typical Applications
BS 970 EN48A
Bars for oil hardening and tempering. Laminated spring plates to this specification shall conform to the dimensional requirements in Appendix C.
JIS G4801 SUP9
Automotive leaf springs, suspension springs
Can BS 970 EN48A Be Substituted With JIS G4801 SUP9?
BS 970 EN48A and JIS G4801 SUP9 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
BS 970 EN48A
No active listings currently.
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)
On M-EX Right Now
BS 970 EN48A
0 active listings and RFQs →
JIS G4801 SUP9
4 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 EN48A and JIS G4801 SUP9?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN48A be substituted with JIS G4801 SUP9?
BS 970 EN48A and JIS G4801 SUP9 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.