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JIS G4801 SUP9 vs BS 970 EN50

Close Alternative — 70.1% match based on chemical composition and mechanical property overlap.

JIS G4801 SUP9 (JIS G 4801:2005) and BS 970 EN50 (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 EN50 is commonly used for annealed wire for oil-hardened and tempered springs; covered by bs 1429.. JIS G4801 SUP9 is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 EN50 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, JIS G4801 SUP9 vs BS 970 EN50 is a 70.1% 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 70.1%.

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
70.1%
MECHANICAL MATCH
No shared data
OVERALL
70.1%
Specifications
Property JIS G4801 SUP9 BS 970 EN50
Standard JIS G 4801:2005 BS 970:1955
Category Spring Steel Spring Steel
C (%) 0.52–0.60 0.40-0.50
Mn (%) 0.65–0.95 0.50-0.70
Cr (%) 0.65–0.95 1.00-1.50
Si (%) 0.15–0.35 0.10-0.35
P (%) ≤0.030 <=0.040
S (%) ≤0.030 <=0.040
V (%) Not specified >=0.15
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 EN50
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 EN50
Annealed wire for oil-hardened and tempered springs; covered by BS 1429.
Key Differences
Can JIS G4801 SUP9 Be Substituted With BS 970 EN50?
JIS G4801 SUP9 and BS 970 EN50 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
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 EN50
No active listings currently.
On M-EX Right Now
JIS G4801 SUP9
4 active listings and RFQs →
BS 970 EN50
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4801 SUP9 and BS 970 EN50?
BS 970 EN50 specifies V which is not specified for JIS G4801 SUP9.
Can JIS G4801 SUP9 be substituted with BS 970 EN50?
JIS G4801 SUP9 and BS 970 EN50 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.