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ASTM A240/A240M S20400 vs ASTM A959 S20400

Strong Match — 99.7% match based on chemical composition and mechanical property overlap.

ASTM A240/A240M S20400 (ASTM A240/A240M:2025) and ASTM A959 S20400 (ASTM A959:2011) are both steel grades. Both fall under the Stainless Steel category. ASTM A240/A240M S20400 is typically used for pressure vessels and general applications (plate, sheet and strip), while ASTM A959 S20400 is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1). ASTM A240/A240M S20400 is defined under ASTM International, originating from United States, while ASTM A959 S20400 is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A240/A240M S20400 vs ASTM A959 S20400 is a 99.7% 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 99.7%.

Frequently Compared With ASTM A240/A240M S20400:
IS 1570 (Part 7) 12Cr12MoVH ASTM A959 .- GOST 5632 08X18H10 EN 10088-1 1.4006 EN 10088-1 1.4401 IS 1570 (Part 7) 12Cr12Ni2Mo ASTM A959 201L EN 10088-1 1.4301 EN 10088-1 1.4845 IS 1570 (Part 7) 12Cr12MoH GOST 5632 06Kh23N28 IS 1570 (Part 7) 11Cr17Ni13W3TiH
Match Breakdown
CHEMISTRY MATCH
99.7%
MECHANICAL MATCH
No shared data
OVERALL
99.7%
Specifications
Property ASTM A240/A240M S20400 ASTM A959 S20400
Standard ASTM A240/A240M:2025 ASTM A959:2011
Category Stainless Steel Stainless Steel
C (%) <=0.030 <=0.030
Mn (%) 7.00-9.00 7.0-9.0
P (%) <=0.040 <=0.045
S (%) <=0.030 <=0.030
Si (%) <=1.00 <=1.00
Cr (%) 15.0-17.0 15.0-17.0
Ni (%) 1.50-3.00 1.50-3.00
N (%) 0.15-0.30 0.15-0.30
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 S20400 ASTM A959 S20400
Tensile Strength >=655 MPa Not specified
Yield Strength >=330 MPa Not specified
Elongation >=35% Not specified
Hardness <=241 HB Not specified
Condition Plate, sheet and strip; yield by 0.2 percent offset Not specified
Typical Applications
ASTM A240/A240M S20400
Pressure vessels and general applications (plate, sheet and strip)
ASTM A959 S20400
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Can ASTM A240/A240M S20400 Be Substituted With ASTM A959 S20400?
ASTM A240/A240M S20400 and ASTM A959 S20400 overlap closely enough on chemistry and mechanical properties that ASTM A959 S20400 is often considered as a substitute for ASTM A240/A240M S20400 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 A240/A240M S20400
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ASTM A959 S20400
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Frequently Asked Questions
What is the difference between ASTM A240/A240M S20400 and ASTM A959 S20400?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A240/A240M S20400 be substituted with ASTM A959 S20400?
ASTM A240/A240M S20400 and ASTM A959 S20400 overlap closely enough on chemistry and mechanical properties that ASTM A959 S20400 is often considered as a substitute for ASTM A240/A240M S20400 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.