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ASME SA105 vs BS 970 (Part 1) 045A10

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

ASME SA105 (ASME BPVC.II.A-2025 SA-105/SA-105M) and BS 970 (Part 1) 045A10 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Carbon Steel category. ASME SA105 is typically used for pressure vessel flanges, boiler fittings, valves, piping components requiring asme certification, while BS 970 (Part 1) 045A10 is commonly used for case hardening steel (section four). BS 970 (Part 1) 045A10 is defined under British Standards (BS) (United Kingdom).

As per chemical composition, ASME SA105 vs BS 970 (Part 1) 045A10 is a 80% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With ASME SA105:
BS 970 (Part 1) 080A20 BS 970 (Part 3) 070M55 BS 970 (Part 1) 040A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 040A04 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 060A32 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 055M15
Match Breakdown
CHEMISTRY MATCH
80%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property ASME SA105 BS 970 (Part 1) 045A10
Standard ASME BPVC.II.A-2025 SA-105/SA-105M BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) ≤0.35 0.08-0.13
Mn (%) 0.60–1.05 0.30-0.60
Si (%) 0.10–0.35 Not specified
P (%) ≤0.035 Not specified
S (%) ≤0.040 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 ASME SA105 BS 970 (Part 1) 045A10
Tensile Strength 485 MPa min 430 MPa min
Yield Strength 250 MPa min Not specified
Elongation ≥22% 18 % min
Hardness ≤197 HB Not specified
Condition Not specified Case hardened, 19 mm test bar
Typical Applications
ASME SA105
Pressure vessel flanges, boiler fittings, valves, piping components requiring ASME certification
BS 970 (Part 1) 045A10
Case hardening steel (section four)
Key Differences
Can ASME SA105 Be Substituted With BS 970 (Part 1) 045A10?
ASME SA105 and BS 970 (Part 1) 045A10 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.
Forms & Sizes Available on M-EX
ASME SA105
Round Bar → (2 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 6000–6800 mm (236.22–267.72 in)
BS 970 (Part 1) 045A10
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On M-EX Right Now
ASME SA105
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BS 970 (Part 1) 045A10
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Frequently Asked Questions
What is the difference between ASME SA105 and BS 970 (Part 1) 045A10?
ASME SA105 specifies Si, P, S which are not specified for BS 970 (Part 1) 045A10.
Can ASME SA105 be substituted with BS 970 (Part 1) 045A10?
ASME SA105 and BS 970 (Part 1) 045A10 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.