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BS 970 EN3A vs BS 970 (Part 1) 055M15

Close Alternative — 72.2% match based on chemical composition and mechanical property overlap.

BS 970 EN3A (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 EN3A is typically used for bolts, screws, light structural components, while BS 970 (Part 1) 055M15 is commonly used for as-rolled, or as-rolled and softened, steel (section two). BS 970 EN3A 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 EN3A vs BS 970 (Part 1) 055M15 is a 83.3% match. As per mechanical properties, the match is 50%. Combined, this makes them a close alternative overall at 72.2%.

Frequently Compared With BS 970 EN3A:
BS 970 (Part 1) 040A10 BS 970 (Part 1) 080A20 BS 970 (Part 3) 070M55 BS 970 (Part 3) 070M20 BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10
Match Breakdown
CHEMISTRY MATCH
83.3%
MECHANICAL MATCH
50%
OVERALL
72.2%
Specifications
Property BS 970 EN3A BS 970 (Part 1) 055M15
Standard BS 970:1955 BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) 0.15-0.25 <=0.20
Si (%) 0.05-0.35 Not specified
Mn (%) 0.40-0.90 <=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 EN3A BS 970 (Part 1) 055M15
Tensile Strength ≥432 MPa (28 tons/sq in, converted) 310 MPa min
Elongation ≥25% 25 % min
Condition , ruling section 6 in (lowest-strength condition of the standard) As-rolled
Hardness Not specified 121 HB min
Typical Applications
BS 970 EN3A
Bolts, screws, light structural components
BS 970 (Part 1) 055M15
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
Can BS 970 EN3A Be Substituted With BS 970 (Part 1) 055M15?
BS 970 EN3A and BS 970 (Part 1) 055M15 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
Forms & Sizes Available on M-EX
BS 970 EN3A
Round Bar → (5 listings)
Diameter: 40–45 mm (1.57–1.77 in)
Length: 5100–7000 mm (200.79–275.59 in)
BS 970 (Part 1) 055M15
No active listings currently.
On M-EX Right Now
BS 970 EN3A
5 active listings and RFQs →
BS 970 (Part 1) 055M15
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 EN3A and BS 970 (Part 1) 055M15?
BS 970 EN3A specifies Si, S, P which are not specified for BS 970 (Part 1) 055M15.
Can BS 970 EN3A be substituted with BS 970 (Part 1) 055M15?
BS 970 EN3A and BS 970 (Part 1) 055M15 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.