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ASTM A240/A240M S20431 vs ASTM A959 S20430

Close Alternative — 80.3% match based on chemical composition and mechanical property overlap.

ASTM A240/A240M S20431 (ASTM A240/A240M:2025) and ASTM A959 S20430 (ASTM A959:2011) are both steel grades. Both fall under the Stainless Steel category. ASTM A240/A240M S20431 is typically used for pressure vessels and general applications (plate, sheet and strip), while ASTM A959 S20430 is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1). ASTM A240/A240M S20431 is defined under ASTM International, originating from United States, while ASTM A959 S20430 is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A240/A240M S20431 vs ASTM A959 S20430 is a 80.3% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a close alternative overall at 80.3%.

Frequently Compared With ASTM A240/A240M S20431:
EN 10088-1 1.4006 EN 10088-1 1.4401 IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12Ni2Mo EN 10088-1 1.4301 GOST 5632 08X18H10 EN 10088-1 1.4845 IS 1570 (Part 7) 11Cr17Ni13W3TiH ASTM A959 201 ASTM A959 .- GB/T 3280 06Cr19Ni10 GOST 5632 06Kh23N28
Match Breakdown
CHEMISTRY MATCH
80.3%
MECHANICAL MATCH
No shared data
OVERALL
80.3%
Specifications
Property ASTM A240/A240M S20431 ASTM A959 S20430
Standard ASTM A240/A240M:2025 ASTM A959:2011
Category Stainless Steel Stainless Steel
C (%) <=0.12 <=0.15
Mn (%) 5.00-7.00 6.5-9.0
P (%) <=0.045 <=0.060
S (%) <=0.030 <=0.030
Si (%) <=1.00 <=1.00
Cr (%) 17.0-18.0 15.5-17.5
Ni (%) 2.0-4.0 1.50-3.50
N (%) 0.10-0.25 0.05-0.25
Cu (%) 1.50-3.50 2.0-4.0
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 S20431 ASTM A959 S20430
Tensile Strength >=620 MPa Not specified
Yield Strength >=310 MPa Not specified
Elongation >=40% 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 S20431
Pressure vessels and general applications (plate, sheet and strip)
ASTM A959 S20430
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Can ASTM A240/A240M S20431 Be Substituted With ASTM A959 S20430?
ASTM A240/A240M S20431 and ASTM A959 S20430 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.
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ASTM A240/A240M S20431
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ASTM A959 S20430
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Frequently Asked Questions
What is the difference between ASTM A240/A240M S20431 and ASTM A959 S20430?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A240/A240M S20431 be substituted with ASTM A959 S20430?
ASTM A240/A240M S20431 and ASTM A959 S20430 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.