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ASTM A240/A240M S30815 vs ASTM A959 321H

Close Alternative — 72.7% match based on chemical composition and mechanical property overlap.

ASTM A240/A240M S30815 (ASTM A240/A240M:2025) and ASTM A959 321H (ASTM A959:2011) are both steel grades. Both fall under the Stainless Steel category. ASTM A240/A240M S30815 is typically used for pressure vessels and general applications (plate, sheet and strip), while ASTM A959 321H is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1). ASTM A240/A240M S30815 is defined under ASTM International, originating from United States, while ASTM A959 321H is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A240/A240M S30815 vs ASTM A959 321H is a 72.7% 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 72.7%.

Frequently Compared With ASTM A240/A240M S30815:
EN 10088-1 1.4845 GOST 5632 06Kh23N28 EN 10088-1 1.4401 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 ASTM A959 .-
Match Breakdown
CHEMISTRY MATCH
72.7%
MECHANICAL MATCH
No shared data
OVERALL
72.7%
Specifications
Property ASTM A240/A240M S30815 ASTM A959 321H
Standard ASTM A240/A240M:2025 ASTM A959:2011
Category Stainless Steel Stainless Steel
C (%) 0.05-0.10 0.04-0.10
Mn (%) <=0.80 <=2.00
P (%) <=0.040 <=0.045
S (%) <=0.030 <=0.030
Si (%) 1.40-2.00 <=1.00
Cr (%) 20.0-22.0 17.0-19.0
Ni (%) 10.0-12.0 9.0-12.0
N (%) 0.14-0.20 <=0.10
Ce (%) 0.03-0.08 Not specified
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 S30815 ASTM A959 321H
Tensile Strength >=600 MPa Not specified
Yield Strength >=310 MPa Not specified
Elongation >=40% Not specified
Hardness <=217 HB Not specified
Condition Plate, sheet and strip; yield by 0.2 percent offset Not specified
Typical Applications
ASTM A240/A240M S30815
Pressure vessels and general applications (plate, sheet and strip)
ASTM A959 321H
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Key Differences
Can ASTM A240/A240M S30815 Be Substituted With ASTM A959 321H?
ASTM A240/A240M S30815 and ASTM A959 321H 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.
On M-EX Right Now
ASTM A240/A240M S30815
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ASTM A959 321H
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Frequently Asked Questions
What is the difference between ASTM A240/A240M S30815 and ASTM A959 321H?
ASTM A240/A240M S30815 specifies Ce which is not specified for ASTM A959 321H.
Can ASTM A240/A240M S30815 be substituted with ASTM A959 321H?
ASTM A240/A240M S30815 and ASTM A959 321H 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.