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ASTM A240/A240M S30435 vs BS 970 (Part 1) 304S31

Close Alternative — 84.4% match based on chemical composition and mechanical property overlap.

ASTM A240/A240M S30435 (ASTM A240/A240M:2025) and BS 970 (Part 1) 304S31 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Stainless Steel category. ASTM A240/A240M S30435 is typically used for pressure vessels and general applications (plate, sheet and strip), while BS 970 (Part 1) 304S31 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 S30435 is defined under ASTM International, originating from United States, while BS 970 (Part 1) 304S31 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, ASTM A240/A240M S30435 vs BS 970 (Part 1) 304S31 is a 84.4% 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 84.4%.

Frequently Compared With ASTM A240/A240M S30435:
EN 10088-1 1.4845 GOST 5632 06Kh23N28 ASTM A959 .- EN 10088-1 1.4006 EN 10088-1 1.4301 EN 10088-1 1.4401 IS 1570 (Part 7) 11Cr17Ni13W3TiH GB/T 3280 06Cr19Ni10 GOST 5632 08X18H10 IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12MoVH IS 1570 (Part 7) 12Cr12Ni2Mo
Match Breakdown
CHEMISTRY MATCH
84.4%
MECHANICAL MATCH
No shared data
OVERALL
84.4%
Specifications
Property ASTM A240/A240M S30435 BS 970 (Part 1) 304S31
Standard ASTM A240/A240M:2025 BS 970 (Part 1):1983
Category Stainless Steel Stainless Steel
C (%) <=0.08 <=0.07
Mn (%) <=2.00 <=2.0
P (%) <=0.045 <=0.045
S (%) <=0.030 <=0.030
Si (%) <=1.00 <=1.0
Cr (%) 16.0-18.0 17.0-19.0
Ni (%) 7.0-9.0 8.0-11.0
Cu (%) 1.50-3.00 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 ASTM A240/A240M S30435 BS 970 (Part 1) 304S31
Tensile Strength >=450 MPa Not specified
Yield Strength >=155 MPa Not specified
Elongation >=45% Not specified
Hardness <=187 HB Not specified
Condition Plate, sheet and strip; yield by 0.2 percent offset Not specified
Typical Applications
ASTM A240/A240M S30435
Pressure vessels and general applications (plate, sheet and strip)
BS 970 (Part 1) 304S31
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 S30435 Be Substituted With BS 970 (Part 1) 304S31?
ASTM A240/A240M S30435 and BS 970 (Part 1) 304S31 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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ASTM A240/A240M S30435
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BS 970 (Part 1) 304S31
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Frequently Asked Questions
What is the difference between ASTM A240/A240M S30435 and BS 970 (Part 1) 304S31?
ASTM A240/A240M S30435 specifies Cu which is not specified for BS 970 (Part 1) 304S31.
Can ASTM A240/A240M S30435 be substituted with BS 970 (Part 1) 304S31?
ASTM A240/A240M S30435 and BS 970 (Part 1) 304S31 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.