Strong Match — 92.9% match
based on chemical composition and mechanical property overlap.
JIS G4304 SUS309S (JIS G4304:2021) and ASTM A959 309HCb (ASTM A959:2011) are both steel grades.
Both fall under the Stainless Steel category.
JIS G4304 SUS309S is typically used for hot-rolled stainless steel plates and strips, while ASTM A959 309HCb is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1).
JIS G4304 SUS309S is defined under Japanese Industrial Standards (JIS), originating from Japan, while ASTM A959 309HCb is defined under ASTM International, originating from United States.
As per chemical composition, JIS G4304 SUS309S vs ASTM A959 309HCb is a 92.9% 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 92.9%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
JIS G4304 SUS309S
ASTM A959 309HCb
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 G4304 SUS309S
Hot-rolled stainless steel plates and strips
ASTM A959 309HCb
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Can JIS G4304 SUS309S Be Substituted With ASTM A959 309HCb?
JIS G4304 SUS309S and ASTM A959 309HCb overlap closely enough on chemistry and mechanical properties that ASTM A959 309HCb is often considered as a substitute for JIS G4304 SUS309S 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 SUS309S and ASTM A959 309HCb?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can JIS G4304 SUS309S be substituted with ASTM A959 309HCb?
JIS G4304 SUS309S and ASTM A959 309HCb overlap closely enough on chemistry and mechanical properties that ASTM A959 309HCb is often considered as a substitute for JIS G4304 SUS309S in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.