Strong Match — 94.8% match
based on chemical composition and mechanical property overlap.
BS 970 (Part 1) 304S31 (BS 970 (Part 1):1991) and ASTM A959 347 (ASTM A959:2011) are both steel grades.
Both fall under the Stainless Steel category.
BS 970 (Part 1) 304S31 is typically used for austenitic stainless and heat resisting steel (section five), 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) 304S31 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) 304S31 vs ASTM A959 347 is a 94.8% 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 94.8%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
BS 970 (Part 1) 304S31
ASTM A959 347
Condition
Softened, 1000-1100 deg C
Not specified
Tensile Strength
490 MPa min
Not specified
Yield Strength
195 MPa min (0.2% proof)
Not specified
Elongation
40 % min
Not specified
Hardness
183 HB max
Not specified
Typical Applications
BS 970 (Part 1) 304S31
Austenitic stainless and heat resisting steel (section five)
ASTM A959 347
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Can BS 970 (Part 1) 304S31 Be Substituted With ASTM A959 347?
BS 970 (Part 1) 304S31 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) 304S31 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) 304S31 and ASTM A959 347?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 (Part 1) 304S31 be substituted with ASTM A959 347?
BS 970 (Part 1) 304S31 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) 304S31 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.