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ASTM A240/A240M S33550 vs ASTM A959 309H

Related Material — 69.9% match based on chemical composition and mechanical property overlap.

ASTM A240/A240M S33550 (ASTM A240/A240M:2025) and ASTM A959 309H (ASTM A959:2011) are both steel grades. Both fall under the Stainless Steel category. ASTM A240/A240M S33550 is typically used for pressure vessels and general applications (plate, sheet and strip), while ASTM A959 309H is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1). ASTM A240/A240M S33550 is defined under ASTM International, originating from United States, while ASTM A959 309H is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A240/A240M S33550 vs ASTM A959 309H is a 70.5% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 69.9%.

Frequently Compared With ASTM A240/A240M S33550:
GOST 5632 06Kh23N28 EN 10088-1 1.4006 IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12Ni2Mo IS 1570 (Part 7) 12Cr13H GB/T 3280 06Cr19Ni10 GOST 5632 08X18H10 EN 10088-1 1.4301 EN 10088-1 1.4401 EN 10088-1 1.4845 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoVH
Match Breakdown
CHEMISTRY MATCH
70.5%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property ASTM A240/A240M S33550 ASTM A959 309H
Standard ASTM A240/A240M:2025 ASTM A959:2011
Category Stainless Steel Stainless Steel
C (%) 0.04-0.10 0.04-0.10
Mn (%) <=1.50 <=2.00
P (%) <=0.040 <=0.045
S (%) <=0.030 <=0.030
Si (%) <=1.00 <=1.00
Cr (%) 25.0-28.0 22.0-24.0
Ni (%) 16.5-20.0 12.0-15.0
N (%) 0.18-0.25 Not specified
Nb (%) 0.05-0.15 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 S33550 ASTM A959 309H
Tensile Strength >=600 MPa Not specified
Yield Strength >=280 MPa Not specified
Elongation >=35% 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 S33550
Pressure vessels and general applications (plate, sheet and strip)
ASTM A959 309H
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Key Differences
Can ASTM A240/A240M S33550 Be Substituted With ASTM A959 309H?
ASTM A240/A240M S33550 and ASTM A959 309H 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 S33550
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ASTM A959 309H
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Frequently Asked Questions
What is the difference between ASTM A240/A240M S33550 and ASTM A959 309H?
ASTM A240/A240M S33550 specifies N, Nb which are not specified for ASTM A959 309H.
Can ASTM A240/A240M S33550 be substituted with ASTM A959 309H?
ASTM A240/A240M S33550 and ASTM A959 309H 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.