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BS 970 EN4 vs BS 970 (Part 1) 055M15

Close Alternative — 70.7% match based on chemical composition and mechanical property overlap.

BS 970 EN4 (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 EN4 is typically used for bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars (excluding cold drawn bars). suitable for a tensile range of 28/38 tons/sq in., while BS 970 (Part 1) 055M15 is commonly used for as-rolled, or as-rolled and softened, steel (section two). BS 970 EN4 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 EN4 vs BS 970 (Part 1) 055M15 is a 89.3% match. As per mechanical properties, the match is 33.3%. Combined, this makes them a close alternative overall at 70.7%.

Frequently Compared With BS 970 EN4:
BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 060A32 BS 970 (Part 1) 060A40 BS 970 (Part 1) 060A45 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 070M20 BS 970 (Part 3) 045M10
Match Breakdown
CHEMISTRY MATCH
89.3%
MECHANICAL MATCH
33.3%
OVERALL
70.7%
Specifications
Property BS 970 EN4 BS 970 (Part 1) 055M15
Standard BS 970:1955 BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) <=0.30 <=0.20
Si (%) 0.05-0.35 Not specified
Mn (%) <=1.00 <=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 EN4 BS 970 (Part 1) 055M15
Tensile Strength 432-587 MPa (28-38 tons/sq in, converted) 310 MPa min
Elongation ≥25% 25 % min
Hardness 126-179 HB 121 HB min
Condition ruling section 6 in (lowest-strength condition of the standard) As-rolled
Typical Applications
BS 970 EN4
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars (excluding cold drawn bars). Suitable for a tensile range of 28/38 tons/sq in.
BS 970 (Part 1) 055M15
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
Can BS 970 EN4 Be Substituted With BS 970 (Part 1) 055M15?
BS 970 EN4 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.
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BS 970 EN4
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BS 970 (Part 1) 055M15
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Frequently Asked Questions
What is the difference between BS 970 EN4 and BS 970 (Part 1) 055M15?
BS 970 EN4 specifies Si, S, P which are not specified for BS 970 (Part 1) 055M15.
Can BS 970 EN4 be substituted with BS 970 (Part 1) 055M15?
BS 970 EN4 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.