Strong Match — 92% match
based on chemical composition and mechanical property overlap.
JIS G4305 SUS305 (JIS G4305:2012) and BS 970 (Part 3) 321S31 (BS 970 (Part 3):1991) are both steel grades.
Both fall under the Stainless Steel category.
JIS G4305 SUS305 is typically used for cold-rolled stainless steel plates, sheet and strip, while BS 970 (Part 3) 321S31 is commonly 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).
JIS G4305 SUS305 is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 (Part 3) 321S31 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, JIS G4305 SUS305 vs BS 970 (Part 3) 321S31 is a 92% 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 92%.
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 SUS305
BS 970 (Part 3) 321S31
Tensile Strength
>=480 MPa
Not specified
Yield Strength
>=175 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 SUS305
Cold-rolled stainless steel plates, sheet and strip
BS 970 (Part 3) 321S31
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)
Can JIS G4305 SUS305 Be Substituted With BS 970 (Part 3) 321S31?
JIS G4305 SUS305 and BS 970 (Part 3) 321S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 321S31 is often considered as a substitute for JIS G4305 SUS305 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 SUS305 and BS 970 (Part 3) 321S31?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can JIS G4305 SUS305 be substituted with BS 970 (Part 3) 321S31?
JIS G4305 SUS305 and BS 970 (Part 3) 321S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 321S31 is often considered as a substitute for JIS G4305 SUS305 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.