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BS 970 EN45A vs EN 10089 55Si7

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

BS 970 EN45A (BS 970:1955) and EN 10089 55Si7 (EN 10089:2002) are both steel grades. Both fall under the Spring Steel category. BS 970 EN45A is defined under British Standards (BS), originating from United Kingdom, while EN 10089 55Si7 is defined under European Standard (EN), originating from Europe.

As per chemical composition, BS 970 EN45A vs EN 10089 55Si7 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 BS 970 EN45A:
IS 3195 60Si7 IS 1570 (Part 4) 60Si7 IS 3431 60Si7 IS 3195 113C6 IS 3431 50Cr4V2 EN 10089 50CrV4 EN 10083-1 51CrV4 EN 10083-3 51CrV4 IS 3195 50Cr4V2 EN 10083-1 51CrV4 IS 1570 (Part 4) 55Si7 IS 4367 55Si7
Match Breakdown
CHEMISTRY MATCH
90.7%
MECHANICAL MATCH
No shared data
OVERALL
90.7%
Specifications
Property BS 970 EN45A EN 10089 55Si7
Standard BS 970:1955 EN 10089:2002
Category Spring Steel Spring Steel
C (%) 0.55-0.65 0.51–0.59
Si (%) 1.70-2.00 1.50–2.00
Mn (%) 0.70-1.00 0.70–1.00
S (%) <=0.050 ≤0.040
P (%) <=0.050 ≤0.040
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 EN45A EN 10089 55Si7
Tensile Strength Not specified 1000–1200 MPa
Yield Strength Not specified ≥900 MPa
Elongation Not specified ≥7%
Hardness Not specified 285–363 HB
Typical Applications
BS 970 EN45A
Not documented
EN 10089 55Si7
Leaf springs, coil springs, torsion bars
Can BS 970 EN45A Be Substituted With EN 10089 55Si7?
BS 970 EN45A and EN 10089 55Si7 overlap closely enough on chemistry and mechanical properties that EN 10089 55Si7 is often considered as a substitute for BS 970 EN45A 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
BS 970 EN45A
No active listings currently.
EN 10089 55Si7
Round Bar → (3 listings)
Diameter: 30–30 mm (1.18–1.18 in)
Length: 4200–7000 mm (165.35–275.59 in)
On M-EX Right Now
BS 970 EN45A
0 active listings and RFQs →
EN 10089 55Si7
3 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 EN45A and EN 10089 55Si7?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN45A be substituted with EN 10089 55Si7?
BS 970 EN45A and EN 10089 55Si7 overlap closely enough on chemistry and mechanical properties that EN 10089 55Si7 is often considered as a substitute for BS 970 EN45A in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.