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JIS G4801 SUP6 vs BS 970 EN45

Strong Match — 90.7% match based on chemical composition and mechanical property overlap.

JIS G4801 SUP6 (JIS G 4801:2005) and BS 970 EN45 (BS 970:1955) are both steel grades. Both fall under the Spring Steel category. JIS G4801 SUP6 is typically used for automotive suspension springs, leaf springs, while BS 970 EN45 is commonly used for leaf springs, coil springs, automotive suspension. JIS G4801 SUP6 is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 EN45 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, JIS G4801 SUP6 vs BS 970 EN45 is a 90.7% 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 90.7%.

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 IS 3431 50Cr4V2 BS 970 EN42C
Match Breakdown
CHEMISTRY MATCH
90.7%
MECHANICAL MATCH
No shared data
OVERALL
90.7%
Specifications
Property JIS G4801 SUP6 BS 970 EN45
Standard JIS G 4801:2005 BS 970:1955
Category Spring Steel Spring Steel
C (%) 0.56–0.64 0.50-0.60
Si (%) 1.50–1.80 1.50-2.00
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 EN45
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 EN45
Leaf springs, coil springs, automotive suspension
Can JIS G4801 SUP6 Be Substituted With BS 970 EN45?
JIS G4801 SUP6 and BS 970 EN45 overlap closely enough on chemistry and mechanical properties that BS 970 EN45 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 EN45
Round Bar → (6 listings)
Diameter: 55–60 mm (2.17–2.36 in)
Length: 5200–6200 mm (204.72–244.09 in)
Flat Bar → (3 listings)
Thickness: 25–25 mm (0.98–0.98 in)
Width: 150–150 mm (5.91–5.91 in)
Length: 2500–3600 mm (98.43–141.73 in)
On M-EX Right Now
JIS G4801 SUP6
2 active listings and RFQs →
BS 970 EN45
9 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4801 SUP6 and BS 970 EN45?
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 EN45?
JIS G4801 SUP6 and BS 970 EN45 overlap closely enough on chemistry and mechanical properties that BS 970 EN45 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.