Strong Match — 99.7% match
based on chemical composition and mechanical property overlap.
JIS G4304 SUS631 (JIS G4304:2021) and ASTM A959 631 (ASTM A959:2011) are both steel grades.
Both fall under the Stainless Steel category.
JIS G4304 SUS631 is typically used for hot-rolled stainless steel plates and strips, while ASTM A959 631 is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1).
JIS G4304 SUS631 is defined under Japanese Industrial Standards (JIS), originating from Japan, while ASTM A959 631 is defined under ASTM International, originating from United States.
As per chemical composition, JIS G4304 SUS631 vs ASTM A959 631 is a 99.7% 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 99.7%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
JIS G4304 SUS631
ASTM A959 631
Tensile Strength
<=1030 MPa
Not specified
Yield Strength
<=380 MPa
Not specified
Elongation
>=20%
Not specified
Hardness
<=192 HB
Not specified
Condition
Solution heat treated plate and strip; proof strength applies only when specified by the purchaser
Not specified
Typical Applications
JIS G4304 SUS631
Hot-rolled stainless steel plates and strips
ASTM A959 631
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Can JIS G4304 SUS631 Be Substituted With ASTM A959 631?
JIS G4304 SUS631 and ASTM A959 631 overlap closely enough on chemistry and mechanical properties that ASTM A959 631 is often considered as a substitute for JIS G4304 SUS631 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 G4304 SUS631 and ASTM A959 631?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can JIS G4304 SUS631 be substituted with ASTM A959 631?
JIS G4304 SUS631 and ASTM A959 631 overlap closely enough on chemistry and mechanical properties that ASTM A959 631 is often considered as a substitute for JIS G4304 SUS631 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.