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ASTM A959 S20430 vs ASTM A240/A240M S20431

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

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

As per chemical composition, ASTM A959 S20430 vs ASTM A240/A240M S20431 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 A959 S20430:
ASTM A959 201 IS 1570 (Part 7) 12Cr12MoH GB/T 3280 06Cr19Ni10 GOST 5632 08X18H10 EN 10088-1 1.4401 GOST 5632 06Kh23N28 EN 10088-1 1.4845 IS 1570 (Part 7) 12Cr12Ni2Mo ASTM A959 202 EN 10088-1 1.4006 EN 10088-1 1.4301 ASTM A959 .-
Match Breakdown
CHEMISTRY MATCH
80.3%
MECHANICAL MATCH
No shared data
OVERALL
80.3%
Specifications
Property ASTM A959 S20430 ASTM A240/A240M S20431
Standard ASTM A959:2011 ASTM A240/A240M:2025
Category Stainless Steel Stainless Steel
C (%) <=0.15 <=0.12
Cr (%) 15.5-17.5 17.0-18.0
Cu (%) 2.0-4.0 1.50-3.50
Mn (%) 6.5-9.0 5.00-7.00
N (%) 0.05-0.25 0.10-0.25
Ni (%) 1.50-3.50 2.0-4.0
P (%) <=0.060 <=0.045
S (%) <=0.030 <=0.030
Si (%) <=1.00 <=1.00
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 S20430 ASTM A240/A240M S20431
Tensile Strength Not specified >=620 MPa
Yield Strength Not specified >=310 MPa
Elongation Not specified >=40%
Hardness Not specified <=241 HB
Condition Not specified Plate, sheet and strip; yield by 0.2 percent offset
Typical Applications
ASTM A959 S20430
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
ASTM A240/A240M S20431
Pressure vessels and general applications (plate, sheet and strip)
Can ASTM A959 S20430 Be Substituted With ASTM A240/A240M S20431?
ASTM A959 S20430 and ASTM A240/A240M S20431 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 A959 S20430
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ASTM A240/A240M S20431
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Frequently Asked Questions
What is the difference between ASTM A959 S20430 and ASTM A240/A240M S20431?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A959 S20430 be substituted with ASTM A240/A240M S20431?
ASTM A959 S20430 and ASTM A240/A240M S20431 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.