Strong Match — 100% match
based on chemical composition and mechanical property overlap.
BS 970 (Part 1) 321S31 (BS 970 (Part 1):1983) and ASTM A959 347 (ASTM A959:2011) are both steel grades.
Both fall under the Stainless Steel category.
BS 970 (Part 1) 321S31 is typically used for austenitic stainless and heat resisting steel for mechanical and allied engineering purposes (table 14, with table 15 for the cold drawn condition)., while ASTM A959 347 is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1).
BS 970 (Part 1) 321S31 is defined under British Standards (BS), originating from United Kingdom, while ASTM A959 347 is defined under ASTM International, originating from United States.
As per chemical composition, BS 970 (Part 1) 321S31 vs ASTM A959 347 is a 100% 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 100%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
BS 970 (Part 1) 321S31
Austenitic stainless and heat resisting steel for mechanical and allied engineering purposes (Table 14, with Table 15 for the cold drawn condition).
ASTM A959 347
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Key Differences
BS 970 (Part 1) 321S31 specifies Ti which is not specified for ASTM A959 347.
Can BS 970 (Part 1) 321S31 Be Substituted With ASTM A959 347?
BS 970 (Part 1) 321S31 and ASTM A959 347 overlap closely enough on chemistry and mechanical properties that ASTM A959 347 is often considered as a substitute for BS 970 (Part 1) 321S31 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 BS 970 (Part 1) 321S31 and ASTM A959 347?
BS 970 (Part 1) 321S31 specifies Ti which is not specified for ASTM A959 347.
Can BS 970 (Part 1) 321S31 be substituted with ASTM A959 347?
BS 970 (Part 1) 321S31 and ASTM A959 347 overlap closely enough on chemistry and mechanical properties that ASTM A959 347 is often considered as a substitute for BS 970 (Part 1) 321S31 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.