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BS 970 (Part 3) 045M10 vs BS 970 (Part 1) 040A12

Strong Match — 87% match based on chemical composition and mechanical property overlap.

BS 970 (Part 3) 045M10 (BS 970 (Part 3):1991) and BS 970 (Part 1) 040A12 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Carbon Steel category. BS 970 (Part 3) 045M10 is typically used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; case hardening steel, carbon and carbon manganese (table 14), while BS 970 (Part 1) 040A12 is commonly used for as-rolled, or as-rolled and softened, steel (section two). BS 970 (Part 3) 045M10 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 1) 040A12 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 (Part 3) 045M10 vs BS 970 (Part 1) 040A12 is a 87% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a strong match overall at 87%.

Frequently Compared With BS 970 (Part 3) 045M10:
BS 970 (Part 3) 045A10 BS 970 (Part 1) 070A67 BS 970 (Part 1) 040A10 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 060A78 BS 970 (Part 1) 045A10 BS 970 (Part 3) 070M20 BS 970 (Part 1) 060A40 BS 970 (Part 1) 080A15 BS 970 (Part 1) 045M10 BS 970 (Part 3) 080A15
Match Breakdown
CHEMISTRY MATCH
87%
MECHANICAL MATCH
No shared data
OVERALL
87%
Specifications
Property BS 970 (Part 3) 045M10 BS 970 (Part 1) 040A12
Standard BS 970 (Part 3):1991 BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) 0.07-0.13 0.10-0.15
Si (%) 0.10-0.40 Not specified
Mn (%) 0.30-0.60 0.30-0.50
P (%) <=0.05 Not specified
S (%) <=0.05 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
BS 970 (Part 3) 045M10
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; case hardening steel, carbon and carbon manganese (Table 14)
BS 970 (Part 1) 040A12
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
Can BS 970 (Part 3) 045M10 Be Substituted With BS 970 (Part 1) 040A12?
BS 970 (Part 3) 045M10 and BS 970 (Part 1) 040A12 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 040A12 is often considered as a substitute for BS 970 (Part 3) 045M10 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
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BS 970 (Part 3) 045M10
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BS 970 (Part 1) 040A12
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Frequently Asked Questions
What is the difference between BS 970 (Part 3) 045M10 and BS 970 (Part 1) 040A12?
BS 970 (Part 3) 045M10 specifies Si, P, S which are not specified for BS 970 (Part 1) 040A12.
Can BS 970 (Part 3) 045M10 be substituted with BS 970 (Part 1) 040A12?
BS 970 (Part 3) 045M10 and BS 970 (Part 1) 040A12 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 040A12 is often considered as a substitute for BS 970 (Part 3) 045M10 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.