Strong Match — 94.7% match
based on chemical composition and mechanical property overlap.
ASTM A240/A240M S31009 (ASTM A240/A240M:2025) and ASTM A240/A240M S31008 (ASTM A240/A240M:2025) are both steel grades.
Both fall under the Stainless Steel category.
ASTM A240/A240M S31009 is typically used for pressure vessels and general applications (plate, sheet and strip), while ASTM A240/A240M S31008 is commonly used for pressure vessels and general applications (plate, sheet and strip).
ASTM A240/A240M S31009 is defined under ASTM International, originating from United States, while ASTM A240/A240M S31008 is defined under ASTM International, originating from United States.
As per chemical composition, ASTM A240/A240M S31009 vs ASTM A240/A240M S31008 is a 92.1% match.
As per mechanical properties, the match is 100%.
Combined, this makes them a strong match overall at 94.7%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
ASTM A240/A240M S31009
ASTM A240/A240M S31008
Tensile Strength
>=515 MPa
>=515 MPa
Yield Strength
>=205 MPa
>=205 MPa
Elongation
>=40%
>=40%
Hardness
<=217 HB
<=217 HB
Condition
Plate, sheet and strip; yield by 0.2 percent offset
Plate, sheet and strip; yield by 0.2 percent offset
Typical Applications
ASTM A240/A240M S31009
Pressure vessels and general applications (plate, sheet and strip)
ASTM A240/A240M S31008
Pressure vessels and general applications (plate, sheet and strip)
Can ASTM A240/A240M S31009 Be Substituted With ASTM A240/A240M S31008?
ASTM A240/A240M S31009 and ASTM A240/A240M S31008 overlap closely enough on chemistry and mechanical properties that ASTM A240/A240M S31008 is often considered as a substitute for ASTM A240/A240M S31009 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 A240/A240M S31009 and ASTM A240/A240M S31008?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A240/A240M S31009 be substituted with ASTM A240/A240M S31008?
ASTM A240/A240M S31009 and ASTM A240/A240M S31008 overlap closely enough on chemistry and mechanical properties that ASTM A240/A240M S31008 is often considered as a substitute for ASTM A240/A240M S31009 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.