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ASTM A240/A240M S21400 vs ASTM A959 .-

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

ASTM A240/A240M S21400 (ASTM A240/A240M:2025) and ASTM A959 .- (ASTM A959:2011) are both steel grades. Both fall under the Stainless Steel category. ASTM A240/A240M S21400 is typically used for pressure vessels and general applications (plate, sheet and strip), while ASTM A959 .- is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1). ASTM A240/A240M S21400 is defined under ASTM International, originating from United States, while ASTM A959 .- is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A240/A240M S21400 vs ASTM A959 .- is a 64% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With ASTM A240/A240M S21400:
GOST 5632 06Kh23N28 EN 10088-1 1.4401 EN 10088-1 1.4845 GB/T 3280 06Cr19Ni10 GOST 5632 08X18H10 EN 10088-1 1.4006 EN 10088-1 1.4301 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12MoVH IS 1570 (Part 7) 12Cr12Ni2Mo IS 1570 (Part 7) 12Cr13H
Match Breakdown
CHEMISTRY MATCH
64%
MECHANICAL MATCH
No shared data
OVERALL
35%
Specifications
Property ASTM A240/A240M S21400 ASTM A959 .-
Standard ASTM A240/A240M:2025 ASTM A959:2011
Category Stainless Steel Stainless Steel
C (%) <=0.12 <=0.030
Mn (%) 14.00-16.00 <=1.00
P (%) <=0.045 <=0.040
S (%) <=0.030 <=0.030
Si (%) 0.30-1.00 <=1.00
Cr (%) 17.0-18.5 18.0-20.0
Ni (%) <=1.00 <=0.50
N (%) >=0.35 <=0.030
Cb (%) Not specified 0.10-0.60
Ti (%) Not specified 0.07-0.30
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
ASTM A240/A240M S21400
Pressure vessels and general applications (plate, sheet and strip)
ASTM A959 .-
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Key Differences
Can ASTM A240/A240M S21400 Be Substituted With ASTM A959 .-?
ASTM A240/A240M S21400 and ASTM A959 .- share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
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ASTM A240/A240M S21400
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ASTM A959 .-
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Frequently Asked Questions
What is the difference between ASTM A240/A240M S21400 and ASTM A959 .-?
ASTM A959 .- specifies Cb, Ti which are not specified for ASTM A240/A240M S21400.
Can ASTM A240/A240M S21400 be substituted with ASTM A959 .-?
ASTM A240/A240M S21400 and ASTM A959 .- share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.