Strong Match — 93.4% match
based on chemical composition and mechanical property overlap.
ASTM A959 303 (ASTM A959:2011) and BS 970 (Part 1) 302S31 (BS 970 (Part 1):1991) are both steel grades.
Both fall under the Stainless Steel category.
ASTM A959 303 is typically used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1), while BS 970 (Part 1) 302S31 is commonly used for austenitic stainless and heat resisting steel (section five).
ASTM A959 303 is defined under ASTM International, originating from United States, while BS 970 (Part 1) 302S31 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, ASTM A959 303 vs BS 970 (Part 1) 302S31 is a 93.4% 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 93.4%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
ASTM A959 303
BS 970 (Part 1) 302S31
Condition
Not specified
Softened, 1000-1100 deg C
Tensile Strength
Not specified
510 MPa min
Yield Strength
Not specified
190 MPa min (0.2% proof)
Elongation
Not specified
40 % min
Hardness
Not specified
183 HB max
Typical Applications
ASTM A959 303
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
BS 970 (Part 1) 302S31
Austenitic stainless and heat resisting steel (section five)
Can ASTM A959 303 Be Substituted With BS 970 (Part 1) 302S31?
ASTM A959 303 and BS 970 (Part 1) 302S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 302S31 is often considered as a substitute for ASTM A959 303 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 303 and BS 970 (Part 1) 302S31?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A959 303 be substituted with BS 970 (Part 1) 302S31?
ASTM A959 303 and BS 970 (Part 1) 302S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 302S31 is often considered as a substitute for ASTM A959 303 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.