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ASTM A959 XM-11 vs ASTM A240/A240M S21904

Strong Match — 97.9% match based on chemical composition and mechanical property overlap.

ASTM A959 XM-11 (ASTM A959:2011) and ASTM A240/A240M S21904 (ASTM A240/A240M:2025) are both steel grades. Both fall under the Stainless Steel category. ASTM A959 XM-11 is typically used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1), while ASTM A240/A240M S21904 is commonly used for pressure vessels and general applications (plate, sheet and strip). ASTM A959 XM-11 is defined under ASTM International, originating from United States, while ASTM A240/A240M S21904 is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A959 XM-11 vs ASTM A240/A240M S21904 is a 97.9% 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 97.9%.

Frequently Compared With ASTM A959 XM-11:
EN 10088-1 1.4845 IS 1570 (Part 7) 12Cr12MoVH GOST 5632 08X18H10 ASTM A959 .- GOST 5632 06Kh23N28 EN 10088-1 1.4006 EN 10088-1 1.4301 EN 10088-1 1.4401 GB/T 3280 06Cr19Ni10 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12Ni2Mo
Match Breakdown
CHEMISTRY MATCH
97.9%
MECHANICAL MATCH
No shared data
OVERALL
97.9%
Specifications
Property ASTM A959 XM-11 ASTM A240/A240M S21904
Standard ASTM A959:2011 ASTM A240/A240M:2025
Category Stainless Steel Stainless Steel
C (%) <=0.04 <=0.04
Cr (%) 19.0-21.5 19.0-21.5
Mn (%) 8.0-10.0 8.00-10.00
N (%) 0.15-0.40 0.15-0.40
Ni (%) 5.5-7.5 5.5-7.5
P (%) <=0.045 <=0.060
S (%) <=0.030 <=0.030
Si (%) <=1.00 <=0.75
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-11 ASTM A240/A240M S21904
Tensile Strength Not specified >=690 MPa
Yield Strength Not specified >=415 MPa
Elongation Not specified >=40%
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-11
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
ASTM A240/A240M S21904
Pressure vessels and general applications (plate, sheet and strip)
Can ASTM A959 XM-11 Be Substituted With ASTM A240/A240M S21904?
ASTM A959 XM-11 and ASTM A240/A240M S21904 overlap closely enough on chemistry and mechanical properties that ASTM A240/A240M S21904 is often considered as a substitute for ASTM A959 XM-11 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
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ASTM A959 XM-11
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ASTM A240/A240M S21904
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Frequently Asked Questions
What is the difference between ASTM A959 XM-11 and ASTM A240/A240M S21904?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A959 XM-11 be substituted with ASTM A240/A240M S21904?
ASTM A959 XM-11 and ASTM A240/A240M S21904 overlap closely enough on chemistry and mechanical properties that ASTM A240/A240M S21904 is often considered as a substitute for ASTM A959 XM-11 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.