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ASTM A240/A240M S21640 vs BS 970 (Part 1) 303S42

Related Material — 61.3% match based on chemical composition and mechanical property overlap.

ASTM A240/A240M S21640 (ASTM A240/A240M:2025) and BS 970 (Part 1) 303S42 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Stainless Steel category. ASTM A240/A240M S21640 is typically used for pressure vessels and general applications (plate, sheet and strip), while BS 970 (Part 1) 303S42 is commonly used for austenitic stainless and heat resisting steel for mechanical and allied engineering purposes (table 14, with table 15 for the cold drawn condition).. ASTM A240/A240M S21640 is defined under ASTM International, originating from United States, while BS 970 (Part 1) 303S42 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, ASTM A240/A240M S21640 vs BS 970 (Part 1) 303S42 is a 61.3% 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 61.3%.

Frequently Compared With ASTM A240/A240M S21640:
GOST 5632 08X18H10 EN 10088-1 1.4006 EN 10088-1 1.4845 ASTM A959 .- GB/T 3280 06Cr19Ni10 GOST 5632 06Kh23N28 EN 10088-1 1.4301 EN 10088-1 1.4401 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12MoVH IS 1570 (Part 7) 12Cr12Ni2Mo
Match Breakdown
CHEMISTRY MATCH
61.3%
MECHANICAL MATCH
No shared data
OVERALL
61.3%
Specifications
Property ASTM A240/A240M S21640 BS 970 (Part 1) 303S42
Standard ASTM A240/A240M:2025 BS 970 (Part 1):1983
Category Stainless Steel Stainless Steel
C (%) <=0.08 <=0.12
Mn (%) 3.50-6.50 <=2.0
P (%) <=0.060 <=0.060
S (%) <=0.030 <=0.060
Si (%) <=1.00 <=1.0
Cr (%) 17.5-19.5 17.0-19.0
Ni (%) 4.0-6.5 8.0-10.0
Mo (%) 0.50-2.00 <=1.00
N (%) 0.08-0.30 Not specified
Nb (%) 0.10-1.00 Not specified
Se (%) Not specified 0.15-0.35
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property ASTM A240/A240M S21640 BS 970 (Part 1) 303S42
Tensile Strength >=650 MPa Not specified
Yield Strength >=310 MPa Not specified
Elongation >=40% Not specified
Condition Plate, sheet and strip; yield by 0.2 percent offset Not specified
Typical Applications
ASTM A240/A240M S21640
Pressure vessels and general applications (plate, sheet and strip)
BS 970 (Part 1) 303S42
Austenitic stainless and heat resisting steel for mechanical and allied engineering purposes (Table 14, with Table 15 for the cold drawn condition).
Key Differences
Can ASTM A240/A240M S21640 Be Substituted With BS 970 (Part 1) 303S42?
ASTM A240/A240M S21640 and BS 970 (Part 1) 303S42 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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ASTM A240/A240M S21640
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BS 970 (Part 1) 303S42
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Frequently Asked Questions
What is the difference between ASTM A240/A240M S21640 and BS 970 (Part 1) 303S42?
ASTM A240/A240M S21640 specifies N, Nb which are not specified for BS 970 (Part 1) 303S42. BS 970 (Part 1) 303S42 specifies Se which is not specified for ASTM A240/A240M S21640.
Can ASTM A240/A240M S21640 be substituted with BS 970 (Part 1) 303S42?
ASTM A240/A240M S21640 and BS 970 (Part 1) 303S42 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.