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ASTM A240/A240M S40955 vs ASTM A959 S40945

Close Alternative — 84.1% match based on chemical composition and mechanical property overlap.

ASTM A240/A240M S40955 (ASTM A240/A240M:2025) and ASTM A959 S40945 (ASTM A959:2011) are both steel grades. Both fall under the Stainless Steel category. ASTM A240/A240M S40955 is typically used for pressure vessels and general applications (plate, sheet and strip), while ASTM A959 S40945 is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1). ASTM A240/A240M S40955 is defined under ASTM International, originating from United States, while ASTM A959 S40945 is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A240/A240M S40955 vs ASTM A959 S40945 is a 84.1% 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 84.1%.

Frequently Compared With ASTM A240/A240M S40955:
GOST 5632 06Kh23N28 EN 10088-1 1.4006 GB/T 3280 06Cr19Ni10 GOST 5632 08X18H10 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12MoVH IS 1570 (Part 7) 12Cr12Ni2Mo EN 10088-1 1.4301 EN 10088-1 1.4401 EN 10088-1 1.4845 IS 1570 (Part 7) 12Cr13H
Match Breakdown
CHEMISTRY MATCH
84.1%
MECHANICAL MATCH
No shared data
OVERALL
84.1%
Specifications
Property ASTM A240/A240M S40955 ASTM A959 S40945
Standard ASTM A240/A240M:2025 ASTM A959:2011
Category Stainless Steel Stainless Steel
C (%) <=0.030 <=0.030
Mn (%) <=1.00 <=1.00
P (%) <=0.040 <=0.040
S (%) <=0.020 <=0.030
Si (%) 1.00-2.00 <=1.00
Cr (%) 10.5-12.0 10.5-11.7
Ni (%) <=0.50 <=0.50
N (%) <=0.030 <=0.030
Nb (%) 0.20-0.50 Not specified
Ti (%) 0.05-0.30 0.05-0.20
Cb (%) Not specified 0.18-0.40
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 S40955 ASTM A959 S40945
Tensile Strength >=380 MPa Not specified
Yield Strength >=205 MPa Not specified
Elongation >=22% Not specified
Hardness <=88 HRBW Not specified
Condition Plate, sheet and strip; yield by 0.2 percent offset Not specified
Typical Applications
ASTM A240/A240M S40955
Pressure vessels and general applications (plate, sheet and strip)
ASTM A959 S40945
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Key Differences
Can ASTM A240/A240M S40955 Be Substituted With ASTM A959 S40945?
ASTM A240/A240M S40955 and ASTM A959 S40945 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 S40955
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ASTM A959 S40945
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Frequently Asked Questions
What is the difference between ASTM A240/A240M S40955 and ASTM A959 S40945?
ASTM A240/A240M S40955 specifies Nb which is not specified for ASTM A959 S40945. ASTM A959 S40945 specifies Cb which is not specified for ASTM A240/A240M S40955.
Can ASTM A240/A240M S40955 be substituted with ASTM A959 S40945?
ASTM A240/A240M S40955 and ASTM A959 S40945 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.