Strong Match — 91% match
based on chemical composition and mechanical property overlap.
ASTM A959 S30430 (ASTM A959:2011) and BS 970 (Part 3) 304S11 (BS 970 (Part 3):1991) are both steel grades.
Both fall under the Stainless Steel category.
ASTM A959 S30430 is typically used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1), while BS 970 (Part 3) 304S11 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; austenitic stainless and heat resisting steel (table 18).
ASTM A959 S30430 is defined under ASTM International, originating from United States, while BS 970 (Part 3) 304S11 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, ASTM A959 S30430 vs BS 970 (Part 3) 304S11 is a 91% 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 91%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
ASTM A959 S30430
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
BS 970 (Part 3) 304S11
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; austenitic stainless and heat resisting steel (Table 18)
Key Differences
ASTM A959 S30430 specifies Cu which is not specified for BS 970 (Part 3) 304S11.
Can ASTM A959 S30430 Be Substituted With BS 970 (Part 3) 304S11?
ASTM A959 S30430 and BS 970 (Part 3) 304S11 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 304S11 is often considered as a substitute for ASTM A959 S30430 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
What is the difference between ASTM A959 S30430 and BS 970 (Part 3) 304S11?
ASTM A959 S30430 specifies Cu which is not specified for BS 970 (Part 3) 304S11.
Can ASTM A959 S30430 be substituted with BS 970 (Part 3) 304S11?
ASTM A959 S30430 and BS 970 (Part 3) 304S11 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 304S11 is often considered as a substitute for ASTM A959 S30430 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.