Close Alternative — 71.4% match
based on chemical composition and mechanical property overlap.
ASTM A240/A240M S81921 (ASTM A240/A240M:2025) and ASTM A240/A240M S32003 (ASTM A240/A240M:2025) are both steel grades.
Both fall under the Stainless Steel category.
ASTM A240/A240M S81921 is typically used for pressure vessels and general applications (plate, sheet and strip), while ASTM A240/A240M S32003 is commonly used for pressure vessels and general applications (plate, sheet and strip).
ASTM A240/A240M S81921 is defined under ASTM International, originating from United States, while ASTM A240/A240M S32003 is defined under ASTM International, originating from United States.
As per chemical composition, ASTM A240/A240M S81921 vs ASTM A240/A240M S32003 is a 82.1% match.
As per mechanical properties, the match is 50%.
Combined, this makes them a close alternative overall at 71.4%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
ASTM A240/A240M S81921
ASTM A240/A240M S32003
Tensile Strength
>=620 MPa
>=690 MPa
Yield Strength
>=450 MPa
>=485 MPa
Elongation
>=25%
>=25%
Hardness
<=293 HB
<=293 HB
Condition
Plate, sheet and strip; yield by 0.2 percent offset
t <= 0.187 in. [5.00 mm] (first condition printed); yield by 0.2 percent offset
Typical Applications
ASTM A240/A240M S81921
Pressure vessels and general applications (plate, sheet and strip)
ASTM A240/A240M S32003
Pressure vessels and general applications (plate, sheet and strip)
Can ASTM A240/A240M S81921 Be Substituted With ASTM A240/A240M S32003?
ASTM A240/A240M S81921 and ASTM A240/A240M S32003 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
What is the difference between ASTM A240/A240M S81921 and ASTM A240/A240M S32003?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A240/A240M S81921 be substituted with ASTM A240/A240M S32003?
ASTM A240/A240M S81921 and ASTM A240/A240M S32003 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.