Strong Match — 96.9% match
based on chemical composition and mechanical property overlap.
ASTM A959 XM-21 (ASTM A959:2011) and ASTM A240/A240M S30452 (ASTM A240/A240M:2025) are both steel grades.
Both fall under the Stainless Steel category.
ASTM A959 XM-21 is typically used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1), while ASTM A240/A240M S30452 is commonly used for pressure vessels and general applications (plate, sheet and strip).
ASTM A959 XM-21 is defined under ASTM International, originating from United States, while ASTM A240/A240M S30452 is defined under ASTM International, originating from United States.
As per chemical composition, ASTM A959 XM-21 vs ASTM A240/A240M S30452 is a 96.9% 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 96.9%.
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 XM-21
ASTM A240/A240M S30452
Tensile Strength
Not specified
>=620 MPa
Yield Strength
Not specified
>=345 MPa
Elongation
Not specified
>=30%
Hardness
Not specified
<=241 HB
Condition
Not specified
Sheet and strip (first condition printed); yield by 0.2 percent offset
Typical Applications
ASTM A959 XM-21
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
ASTM A240/A240M S30452
Pressure vessels and general applications (plate, sheet and strip)
Can ASTM A959 XM-21 Be Substituted With ASTM A240/A240M S30452?
ASTM A959 XM-21 and ASTM A240/A240M S30452 overlap closely enough on chemistry and mechanical properties that ASTM A240/A240M S30452 is often considered as a substitute for ASTM A959 XM-21 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 XM-21 and ASTM A240/A240M S30452?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A959 XM-21 be substituted with ASTM A240/A240M S30452?
ASTM A959 XM-21 and ASTM A240/A240M S30452 overlap closely enough on chemistry and mechanical properties that ASTM A240/A240M S30452 is often considered as a substitute for ASTM A959 XM-21 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.