Strong Match — 89.2% match
based on chemical composition and mechanical property overlap.
JIS G4304 SUS420J2 (JIS G4304:2021) and BS 970 (Part 3) 420S37 (BS 970 (Part 3):1991) are both steel grades.
Both fall under the Stainless Steel category.
JIS G4304 SUS420J2 is typically used for hot-rolled stainless steel plates and strips, while BS 970 (Part 3) 420S37 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; martensitic stainless steel (table 17).
JIS G4304 SUS420J2 is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 (Part 3) 420S37 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, JIS G4304 SUS420J2 vs BS 970 (Part 3) 420S37 is a 89.2% 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 89.2%.
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 SUS420J2
BS 970 (Part 3) 420S37
Tensile Strength
>=540 MPa
Not specified
Yield Strength
>=225 MPa
Not specified
Elongation
>=18%
Not specified
Hardness
<=235 HB
Not specified
Condition
Annealed plate and strip; proof strength applies only when specified by the purchaser
Not specified
Typical Applications
JIS G4304 SUS420J2
Hot-rolled stainless steel plates and strips
BS 970 (Part 3) 420S37
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; martensitic stainless steel (Table 17)
Can JIS G4304 SUS420J2 Be Substituted With BS 970 (Part 3) 420S37?
JIS G4304 SUS420J2 and BS 970 (Part 3) 420S37 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 420S37 is often considered as a substitute for JIS G4304 SUS420J2 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 SUS420J2 and BS 970 (Part 3) 420S37?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can JIS G4304 SUS420J2 be substituted with BS 970 (Part 3) 420S37?
JIS G4304 SUS420J2 and BS 970 (Part 3) 420S37 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 420S37 is often considered as a substitute for JIS G4304 SUS420J2 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.