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BS 970 EN48 vs EN 10089 55Si7

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

BS 970 EN48 (BS 970:1955) and EN 10089 55Si7 (EN 10089:2002) are both steel grades. Both fall under the Spring Steel category. BS 970 EN48 is typically used for high duty springs, valve springs, while EN 10089 55Si7 is commonly used for leaf springs, coil springs, torsion bars. BS 970 EN48 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 EN48 vs EN 10089 55Si7 is a 72.9% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With BS 970 EN48:
EN 10089 50CrV4 EN 10083-3 51CrV4 EN 10089 55Cr3 IS 3431 50Cr4V2 GB/T 1222 55CrMnA IS 3195 50Cr4V2 IS 3195 113C6 IS 3195 60Cr4V2 EN 10083-1 51CrV4 IS 5517 55Cr3 EN 10083-1 51CrV4 IS 3431 60Cr4V2
Match Breakdown
CHEMISTRY MATCH
72.9%
MECHANICAL MATCH
No shared data
OVERALL
35%
Specifications
Property BS 970 EN48 EN 10089 55Si7
Standard BS 970:1955 EN 10089:2002
Category Spring Steel Spring Steel
C (%) 0.45-0.55 0.51–0.59
Si (%) 0.10-0.50 1.50–2.00
Mn (%) 0.50-0.80 0.70–1.00
Cr (%) 1.00-1.40 Not specified
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 EN48 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 EN48
High duty springs, valve springs
EN 10089 55Si7
Leaf springs, coil springs, torsion bars
Key Differences
Can BS 970 EN48 Be Substituted With EN 10089 55Si7?
BS 970 EN48 and EN 10089 55Si7 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
Forms & Sizes Available on M-EX
BS 970 EN48
Flat Bar → (3 listings)
Thickness: 30–30 mm (1.18–1.18 in)
Width: 150–150 mm (5.91–5.91 in)
Length: 2500–2800 mm (98.43–110.24 in)
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 EN48
3 active listings and RFQs →
EN 10089 55Si7
3 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 EN48 and EN 10089 55Si7?
BS 970 EN48 specifies Cr which is not specified for EN 10089 55Si7.
Can BS 970 EN48 be substituted with EN 10089 55Si7?
BS 970 EN48 and EN 10089 55Si7 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.