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