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SAE J403 1018 vs BS 970 (Part 1) 040A12

Close Alternative — 84.6% match based on chemical composition and mechanical property overlap.

SAE J403 1018 (SAE J403:2001) and BS 970 (Part 1) 040A12 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Carbon Steel category. SAE J403 1018 is typically used for chemistry-only grade; product scope as listed in the composition notes, while BS 970 (Part 1) 040A12 is commonly used for as-rolled, or as-rolled and softened, steel (section two). SAE J403 1018 is defined under SAE International, originating from United States, while BS 970 (Part 1) 040A12 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, SAE J403 1018 vs BS 970 (Part 1) 040A12 is a 84.6% 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 84.6%.

Frequently Compared With SAE J403 1018:
BS 970 (Part 1) 040A10 BS 970 (Part 3) 070M55 BS 970 (Part 1) 080A20 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 060A32 BS 970 (Part 1) 040A04 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 055M15
Match Breakdown
CHEMISTRY MATCH
84.6%
MECHANICAL MATCH
No shared data
OVERALL
84.6%
Specifications
Property SAE J403 1018 BS 970 (Part 1) 040A12
Standard SAE J403:2001 BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) 0.15-0.20 0.10-0.15
Mn (%) 0.60-0.90 0.30-0.50
P (%) <=0.030 Not specified
S (%) <=0.050 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
SAE J403 1018
Chemistry-only grade; product scope as listed in the composition notes
BS 970 (Part 1) 040A12
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
Can SAE J403 1018 Be Substituted With BS 970 (Part 1) 040A12?
SAE J403 1018 and BS 970 (Part 1) 040A12 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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SAE J403 1018
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BS 970 (Part 1) 040A12
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Frequently Asked Questions
What is the difference between SAE J403 1018 and BS 970 (Part 1) 040A12?
SAE J403 1018 specifies P, S which are not specified for BS 970 (Part 1) 040A12.
Can SAE J403 1018 be substituted with BS 970 (Part 1) 040A12?
SAE J403 1018 and BS 970 (Part 1) 040A12 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.