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BS 970 (Part 1) 125A15 vs BS 970 (Part 1) 040A12

Related Material — 69.9% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 125A15 (BS 970 (Part 1):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 1) 125A15 is typically used for case hardening steel (section four), while BS 970 (Part 1) 040A12 is commonly used for as-rolled, or as-rolled and softened, steel (section two). BS 970 (Part 1) 125A15 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 1) 125A15 vs BS 970 (Part 1) 040A12 is a 87.9% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 69.9%.

Frequently Compared With BS 970 (Part 1) 125A15:
BS 970 (Part 1) 040A10 BS 970 (Part 1) 060A67 BS 970 (Part 1) 080A15 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 060A72 BS 970 (Part 1) 060A78 BS 970 (Part 1) 040A04 BS 970 (Part 3) 045A10 BS 970 (Part 1) 060A62
Match Breakdown
CHEMISTRY MATCH
87.9%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property BS 970 (Part 1) 125A15 BS 970 (Part 1) 040A12
Standard BS 970 (Part 1):1991 BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) 0.13-0.18 0.10-0.15
Mn (%) 1.10-1.40 0.30-0.50
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) 125A15 BS 970 (Part 1) 040A12
Condition Case hardened, 19 mm test bar Not specified
Tensile Strength 650 MPa min Not specified
Elongation 14 % min Not specified
Typical Applications
BS 970 (Part 1) 125A15
Case hardening steel (section four)
BS 970 (Part 1) 040A12
As-rolled, or as-rolled and softened, steel (section two)
Can BS 970 (Part 1) 125A15 Be Substituted With BS 970 (Part 1) 040A12?
BS 970 (Part 1) 125A15 and BS 970 (Part 1) 040A12 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.
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BS 970 (Part 1) 125A15
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BS 970 (Part 1) 040A12
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Frequently Asked Questions
What is the difference between BS 970 (Part 1) 125A15 and BS 970 (Part 1) 040A12?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 (Part 1) 125A15 be substituted with BS 970 (Part 1) 040A12?
BS 970 (Part 1) 125A15 and BS 970 (Part 1) 040A12 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.