Post Stock Login Register

EN 10089 55Si7 vs BS 970 EN45

Strong Match — 98.3% match based on chemical composition and mechanical property overlap.

EN 10089 55Si7 (EN 10089:2002) and BS 970 EN45 (BS 970:1955) are both steel grades. Both fall under the Spring Steel category. EN 10089 55Si7 is typically used for leaf springs, coil springs, torsion bars, while BS 970 EN45 is commonly used for leaf springs, coil springs, automotive suspension. EN 10089 55Si7 is defined under European Standard (EN), originating from Europe, while BS 970 EN45 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, EN 10089 55Si7 vs BS 970 EN45 is a 98.3% 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 98.3%.

Frequently Compared With EN 10089 55Si7:
EN 10089 50CrV4 EN 10083-3 51CrV4 EN 10089 55Cr3 GB/T 1222 55CrMnA IS 1570 (Part 4) 55Si7 IS 1570 (Part 4) 60Si7 IS 1570 (Part 4) 65Si7 IS 4367 55Si7 IS 5517 55Cr3 BS 970 EN42B
Other Spring Steel Grades to Compare With EN 10089 55Si7:
IS 3195 113C6 IS 3431 50Cr4V2
Match Breakdown
CHEMISTRY MATCH
98.3%
MECHANICAL MATCH
No shared data
OVERALL
98.3%
Specifications
Property EN 10089 55Si7 BS 970 EN45
Standard EN 10089:2002 BS 970:1955
Category Spring Steel Spring Steel
C (%) 0.51–0.59 0.50-0.60
Si (%) 1.50–2.00 1.50-2.00
Mn (%) 0.70–1.00 0.70-1.00
S (%) ≤0.040 <=0.050
P (%) ≤0.040 <=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 EN 10089 55Si7 BS 970 EN45
Tensile Strength 1000–1200 MPa Not specified
Yield Strength ≥900 MPa Not specified
Elongation ≥7% Not specified
Hardness 285–363 HB Not specified
Typical Applications
EN 10089 55Si7
Leaf springs, coil springs, torsion bars
BS 970 EN45
Leaf springs, coil springs, automotive suspension
Can EN 10089 55Si7 Be Substituted With BS 970 EN45?
EN 10089 55Si7 and BS 970 EN45 overlap closely enough on chemistry and mechanical properties that BS 970 EN45 is often considered as a substitute for EN 10089 55Si7 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
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)
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
EN 10089 55Si7
3 active listings and RFQs →
BS 970 EN45
9 active listings and RFQs →
Frequently Asked Questions
What is the difference between EN 10089 55Si7 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 EN 10089 55Si7 be substituted with BS 970 EN45?
EN 10089 55Si7 and BS 970 EN45 overlap closely enough on chemistry and mechanical properties that BS 970 EN45 is often considered as a substitute for EN 10089 55Si7 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.