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JIS G4801 SUP6 vs BS 970 EN45A

Strong Match — 91.7% match based on chemical composition and mechanical property overlap.

JIS G4801 SUP6 (JIS G 4801:2005) and BS 970 EN45A (BS 970:1955) are both steel grades. Both fall under the Spring Steel category. JIS G4801 SUP6 is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 EN45A is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, JIS G4801 SUP6 vs BS 970 EN45A is a 91.7% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a strong match overall at 91.7%.

Frequently Compared With JIS G4801 SUP6:
EN 10089 55Si7 EN 10089 55Cr3 EN 10089 50CrV4 EN 10083-3 51CrV4 GB/T 1222 55CrMnA IS 3431 60Si7 IS 1570 (Part 4) 55Si7 IS 1570 (Part 4) 60Si7 IS 1570 (Part 4) 65Si7 IS 3195 113C6 BS 970 EN42C IS 3431 50Cr4V2
Match Breakdown
CHEMISTRY MATCH
91.7%
MECHANICAL MATCH
No shared data
OVERALL
91.7%
Specifications
Property JIS G4801 SUP6 BS 970 EN45A
Standard JIS G 4801:2005 BS 970:1955
Category Spring Steel Spring Steel
C (%) 0.56–0.64 0.55-0.65
Si (%) 1.50–1.80 1.70-2.00
Mn (%) 0.70–1.00 0.70-1.00
S (%) ≤0.030 <=0.050
P (%) ≤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 SUP6 BS 970 EN45A
Tensile Strength ≥1130 MPa Not specified
Yield Strength ≥980 MPa Not specified
Elongation ≥7% Not specified
Hardness 341–415 HB Not specified
Typical Applications
JIS G4801 SUP6
Automotive suspension springs, leaf springs
BS 970 EN45A
Not documented
Can JIS G4801 SUP6 Be Substituted With BS 970 EN45A?
JIS G4801 SUP6 and BS 970 EN45A overlap closely enough on chemistry and mechanical properties that BS 970 EN45A is often considered as a substitute for JIS G4801 SUP6 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
JIS G4801 SUP6
Round Bar → (2 listings)
Diameter: 30–30 mm (1.18–1.18 in)
Length: 4500–5700 mm (177.17–224.41 in)
BS 970 EN45A
No active listings currently.
On M-EX Right Now
JIS G4801 SUP6
2 active listings and RFQs →
BS 970 EN45A
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4801 SUP6 and BS 970 EN45A?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can JIS G4801 SUP6 be substituted with BS 970 EN45A?
JIS G4801 SUP6 and BS 970 EN45A overlap closely enough on chemistry and mechanical properties that BS 970 EN45A is often considered as a substitute for JIS G4801 SUP6 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.