Strong Match — 96.5% match
based on chemical composition and mechanical property overlap.
BS 970 (Part 3) 303S31 (BS 970 (Part 3):1991) and BS 970 (Part 1) 302S31 (BS 970 (Part 1):1983) are both steel grades.
Both fall under the Stainless Steel category.
BS 970 (Part 3) 303S31 is typically 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), while BS 970 (Part 1) 302S31 is commonly used for austenitic stainless and heat resisting steel for mechanical and allied engineering purposes (table 14, with table 15 for the cold drawn condition)..
BS 970 (Part 3) 303S31 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 1) 302S31 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, BS 970 (Part 3) 303S31 vs BS 970 (Part 1) 302S31 is a 96.5% 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 96.5%.
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 3) 303S31
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)
BS 970 (Part 1) 302S31
Austenitic stainless and heat resisting steel for mechanical and allied engineering purposes (Table 14, with Table 15 for the cold drawn condition).
Can BS 970 (Part 3) 303S31 Be Substituted With BS 970 (Part 1) 302S31?
BS 970 (Part 3) 303S31 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 BS 970 (Part 3) 303S31 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 3) 303S31 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 BS 970 (Part 3) 303S31 be substituted with BS 970 (Part 1) 302S31?
BS 970 (Part 3) 303S31 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 BS 970 (Part 3) 303S31 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.