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BS 970 (Part 1) 055M15 vs BS 970 (Part 3) 070M20

Close Alternative — 83.3% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 055M15 (BS 970 (Part 1):1991) and BS 970 (Part 3) 070M20 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Carbon Steel category. BS 970 (Part 1) 055M15 is typically used for as-rolled, or as-rolled and softened, steel (section two), while BS 970 (Part 3) 070M20 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; carbon and carbon manganese steel (table 13). BS 970 (Part 1) 055M15 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 3) 070M20 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 (Part 1) 055M15 vs BS 970 (Part 3) 070M20 is a 83.3% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a close alternative overall at 83.3%.

Frequently Compared With BS 970 (Part 1) 055M15:
BS 970 (Part 1) 040A10 BS 970 (Part 1) 060A40 BS 970 (Part 1) 040A12 BS 970 (Part 1) 060A81 BS 970 (Part 1) 045A10 BS 970 (Part 1) 060A78 BS 970 (Part 3) 080A15 BS 970 (Part 1) 040A04 BS 970 (Part 1) 070A67 BS 970 (Part 1) 080A15 BS 970 (Part 1) 045M10 BS 970 (Part 1) 045A10
Match Breakdown
CHEMISTRY MATCH
83.3%
MECHANICAL MATCH
No shared data
OVERALL
83.3%
Specifications
Property BS 970 (Part 1) 055M15 BS 970 (Part 3) 070M20
Standard BS 970 (Part 1):1991 BS 970 (Part 3):1991
Category Carbon Steel Carbon Steel
C (%) <=0.20 0.16-0.24
Mn (%) <=0.80 0.50-0.90
Si (%) Not specified 0.10-0.40
P (%) Not specified <=0.05
S (%) Not specified <=0.05
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 (Part 1) 055M15 BS 970 (Part 3) 070M20
Condition As-rolled Not specified
Tensile Strength 310 MPa min Not specified
Elongation 25 % min Not specified
Hardness 121 HB min Not specified
Typical Applications
BS 970 (Part 1) 055M15
As-rolled, or as-rolled and softened, steel (section two)
BS 970 (Part 3) 070M20
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; carbon and carbon manganese steel (Table 13)
Key Differences
Can BS 970 (Part 1) 055M15 Be Substituted With BS 970 (Part 3) 070M20?
BS 970 (Part 1) 055M15 and BS 970 (Part 3) 070M20 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.
On M-EX Right Now
BS 970 (Part 1) 055M15
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BS 970 (Part 3) 070M20
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Frequently Asked Questions
What is the difference between BS 970 (Part 1) 055M15 and BS 970 (Part 3) 070M20?
BS 970 (Part 3) 070M20 specifies Si, P, S which are not specified for BS 970 (Part 1) 055M15.
Can BS 970 (Part 1) 055M15 be substituted with BS 970 (Part 3) 070M20?
BS 970 (Part 1) 055M15 and BS 970 (Part 3) 070M20 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.