Strong Match — 97.9% match
based on chemical composition and mechanical property overlap.
JIS G4305 SUS321 (JIS G4305:2012) and BS 970 (Part 1) 321S31 (BS 970 (Part 1):1983) are both steel grades.
Both fall under the Stainless Steel category.
JIS G4305 SUS321 is typically used for cold-rolled stainless steel plates, sheet and strip, while BS 970 (Part 1) 321S31 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)..
JIS G4305 SUS321 is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 (Part 1) 321S31 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, JIS G4305 SUS321 vs BS 970 (Part 1) 321S31 is a 97.9% 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 97.9%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
JIS G4305 SUS321
BS 970 (Part 1) 321S31
Tensile Strength
>=520 MPa
Not specified
Yield Strength
>=205 MPa
Not specified
Elongation
>=40%
Not specified
Hardness
<=187 HB
Not specified
Condition
Solution heat treated plate and strip; 0.2 percent proof strength applies only when specified by the purchaser
Not specified
Typical Applications
JIS G4305 SUS321
Cold-rolled stainless steel plates, sheet and strip
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).
Key Differences
BS 970 (Part 1) 321S31 specifies Ti which is not specified for JIS G4305 SUS321.
Can JIS G4305 SUS321 Be Substituted With BS 970 (Part 1) 321S31?
JIS G4305 SUS321 and BS 970 (Part 1) 321S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 321S31 is often considered as a substitute for JIS G4305 SUS321 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 JIS G4305 SUS321 and BS 970 (Part 1) 321S31?
BS 970 (Part 1) 321S31 specifies Ti which is not specified for JIS G4305 SUS321.
Can JIS G4305 SUS321 be substituted with BS 970 (Part 1) 321S31?
JIS G4305 SUS321 and BS 970 (Part 1) 321S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 321S31 is often considered as a substitute for JIS G4305 SUS321 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.