Close Alternative — 83.9% match
based on chemical composition and mechanical property overlap.
ASTM A959 443 (ASTM A959:2011) and BS 970 (Part 3) 430S17 (BS 970 (Part 3):1991) are both steel grades.
Both fall under the Stainless Steel category.
ASTM A959 443 is typically used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1), while BS 970 (Part 3) 430S17 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; ferritic stainless steel (table 17).
ASTM A959 443 is defined under ASTM International, originating from United States, while BS 970 (Part 3) 430S17 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, ASTM A959 443 vs BS 970 (Part 3) 430S17 is a 83.9% 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 83.9%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
ASTM A959 443
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
BS 970 (Part 3) 430S17
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; ferritic stainless steel (Table 17)
Key Differences
ASTM A959 443 specifies Cu which is not specified for BS 970 (Part 3) 430S17.
Can ASTM A959 443 Be Substituted With BS 970 (Part 3) 430S17?
ASTM A959 443 and BS 970 (Part 3) 430S17 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.
What is the difference between ASTM A959 443 and BS 970 (Part 3) 430S17?
ASTM A959 443 specifies Cu which is not specified for BS 970 (Part 3) 430S17.
Can ASTM A959 443 be substituted with BS 970 (Part 3) 430S17?
ASTM A959 443 and BS 970 (Part 3) 430S17 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.