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SAE J403 1021 vs BS 970 (Part 1) 045A10

Strong Match — 85.7% match based on chemical composition and mechanical property overlap.

SAE J403 1021 (SAE J403:2014) and BS 970 (Part 1) 045A10 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Carbon Steel category. SAE J403 1021 is typically used for chemistry-only grade; product scope as listed in the composition notes, while BS 970 (Part 1) 045A10 is commonly used for case hardening steel (section four). SAE J403 1021 is defined under SAE International, originating from United States, while BS 970 (Part 1) 045A10 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, SAE J403 1021 vs BS 970 (Part 1) 045A10 is a 85.7% 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 85.7%.

Frequently Compared With SAE J403 1021:
BS 970 (Part 1) 080A20 BS 970 (Part 3) 070M55 BS 970 (Part 1) 070M20 BS 970 (Part 1) 040A10 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 045M10
Match Breakdown
CHEMISTRY MATCH
85.7%
MECHANICAL MATCH
No shared data
OVERALL
85.7%
Specifications
Property SAE J403 1021 BS 970 (Part 1) 045A10
Standard SAE J403:2014 BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) 0.18-0.23 0.08-0.13
Mn (%) 0.60-0.90 0.30-0.60
P (%) <=0.030 (flat rolled), <=0.040 (long products) Not specified
S (%) <=0.035 (flat rolled), <=0.050 (long products) 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 SAE J403 1021 BS 970 (Part 1) 045A10
Condition Not specified Case hardened, 19 mm test bar
Tensile Strength Not specified 430 MPa min
Elongation Not specified 18 % min
Typical Applications
SAE J403 1021
Chemistry-only grade; product scope as listed in the composition notes
BS 970 (Part 1) 045A10
Case hardening steel (section four)
Key Differences
Can SAE J403 1021 Be Substituted With BS 970 (Part 1) 045A10?
SAE J403 1021 and BS 970 (Part 1) 045A10 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 045A10 is often considered as a substitute for SAE J403 1021 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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SAE J403 1021
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BS 970 (Part 1) 045A10
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Frequently Asked Questions
What is the difference between SAE J403 1021 and BS 970 (Part 1) 045A10?
SAE J403 1021 specifies P, S which are not specified for BS 970 (Part 1) 045A10.
Can SAE J403 1021 be substituted with BS 970 (Part 1) 045A10?
SAE J403 1021 and BS 970 (Part 1) 045A10 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 045A10 is often considered as a substitute for SAE J403 1021 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.