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BS 970 EN9 vs BS 970 (Part 1) 055M15

Minimal Match — 54.1% match based on chemical composition and mechanical property overlap.

BS 970 EN9 (BS 970:1955) and BS 970 (Part 1) 055M15 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Carbon Steel category. BS 970 EN9 is typically used for springs, chisels, punches, dies, while BS 970 (Part 1) 055M15 is commonly used for as-rolled, or as-rolled and softened, steel (section two). BS 970 EN9 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 1) 055M15 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 EN9 vs BS 970 (Part 1) 055M15 is a 81.2% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 54.1%.

Frequently Compared With BS 970 EN9:
BS 970 (Part 3) 070M55 BS 970 (Part 1) 040A10 BS 970 (Part 1) 080A20 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 060A32 BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10
Match Breakdown
CHEMISTRY MATCH
81.2%
MECHANICAL MATCH
0%
OVERALL
54.1%
Specifications
Property BS 970 EN9 BS 970 (Part 1) 055M15
Standard BS 970:1955 BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) 0.50-0.60 <=0.20
Si (%) 0.05-0.35 Not specified
Mn (%) 0.50-0.80 <=0.80
S (%) <=0.060 Not specified
P (%) <=0.060 Not specified
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 EN9 BS 970 (Part 1) 055M15
Tensile Strength ≥695 MPa (45 tons/sq in, converted) 310 MPa min
Yield Strength ≥355 MPa (23 tons/sq in, converted) Not specified
Elongation ≥18% 25 % min
Hardness 201-255 HB 121 HB min
Condition Normalised, ruling section 4 in (lowest-strength condition of the standard) As-rolled
Typical Applications
BS 970 EN9
Springs, chisels, punches, dies
BS 970 (Part 1) 055M15
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
Can BS 970 EN9 Be Substituted With BS 970 (Part 1) 055M15?
BS 970 EN9 and BS 970 (Part 1) 055M15 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 EN9
Round Bar → (3 listings)
Diameter: 70–70 mm (2.76–2.76 in)
Length: 5600–6900 mm (220.47–271.65 in)
BS 970 (Part 1) 055M15
No active listings currently.
On M-EX Right Now
BS 970 EN9
3 active listings and RFQs →
BS 970 (Part 1) 055M15
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 EN9 and BS 970 (Part 1) 055M15?
BS 970 EN9 specifies Si, S, P which are not specified for BS 970 (Part 1) 055M15.
Can BS 970 EN9 be substituted with BS 970 (Part 1) 055M15?
BS 970 EN9 and BS 970 (Part 1) 055M15 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.