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BS 970 EN50 vs JIS G4801 SUP10

Close Alternative — 72.9% match based on chemical composition and mechanical property overlap.

BS 970 EN50 (BS 970:1955) and JIS G4801 SUP10 (JIS G 4801:2005) are both steel grades. Both fall under the Spring Steel category. BS 970 EN50 is typically used for annealed wire for oil-hardened and tempered springs; covered by bs 1429., while JIS G4801 SUP10 is commonly used for valve springs, high stress coil springs, torsion springs. BS 970 EN50 is defined under British Standards (BS), originating from United Kingdom, while JIS G4801 SUP10 is defined under Japanese Industrial Standards (JIS), originating from Japan.

As per chemical composition, BS 970 EN50 vs JIS G4801 SUP10 is a 72.9% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a close alternative overall at 72.9%.

Frequently Compared With BS 970 EN50:
EN 10083-3 51CrV4 EN 10089 50CrV4 EN 10089 55Cr3 EN 10083-1 51CrV4 IS 5517 55Cr3 IS 3431 50Cr4V2 IS 3195 50Cr4V2 EN 10083-1 51CrV4 IS 3195 113C6 IS 3195 52Cr4Mo2V IS 3431 60Cr4V2 IS 3195 60Cr4V2
Match Breakdown
CHEMISTRY MATCH
72.9%
MECHANICAL MATCH
No shared data
OVERALL
72.9%
Specifications
Property BS 970 EN50 JIS G4801 SUP10
Standard BS 970:1955 JIS G 4801:2005
Category Spring Steel Spring Steel
C (%) 0.40-0.50 0.47–0.55
Si (%) 0.10-0.35 0.15–0.35
Mn (%) 0.50-0.70 0.65–0.95
Cr (%) 1.00-1.50 0.80–1.10
V (%) >=0.15 0.15–0.25
S (%) <=0.040 ≤0.030
P (%) <=0.040 ≤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 EN50 JIS G4801 SUP10
Tensile Strength Not specified ≥1180 MPa
Yield Strength Not specified ≥1030 MPa
Elongation Not specified ≥7%
Hardness Not specified 363–429 HB
Typical Applications
BS 970 EN50
Annealed wire for oil-hardened and tempered springs; covered by BS 1429.
JIS G4801 SUP10
Valve springs, high stress coil springs, torsion springs
Can BS 970 EN50 Be Substituted With JIS G4801 SUP10?
BS 970 EN50 and JIS G4801 SUP10 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
Forms & Sizes Available on M-EX
BS 970 EN50
No active listings currently.
JIS G4801 SUP10
Round Bar → (3 listings)
Diameter: 30–30 mm (1.18–1.18 in)
Length: 5100–5900 mm (200.79–232.28 in)
On M-EX Right Now
BS 970 EN50
0 active listings and RFQs →
JIS G4801 SUP10
3 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 EN50 and JIS G4801 SUP10?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN50 be substituted with JIS G4801 SUP10?
BS 970 EN50 and JIS G4801 SUP10 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.