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ASTM A240/A240M S21640 vs ASTM A959 329

Related Material — 63.7% match based on chemical composition and mechanical property overlap.

ASTM A240/A240M S21640 (ASTM A240/A240M:2025) and ASTM A959 329 (ASTM A959:2011) are both steel grades. Both fall under the Stainless Steel category. ASTM A240/A240M S21640 is typically used for pressure vessels and general applications (plate, sheet and strip), while ASTM A959 329 is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1). ASTM A240/A240M S21640 is defined under ASTM International, originating from United States, while ASTM A959 329 is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A240/A240M S21640 vs ASTM A959 329 is a 63.7% 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 63.7%.

Frequently Compared With ASTM A240/A240M S21640:
GOST 5632 08X18H10 EN 10088-1 1.4006 EN 10088-1 1.4845 ASTM A959 .- GB/T 3280 06Cr19Ni10 GOST 5632 06Kh23N28 EN 10088-1 1.4301 EN 10088-1 1.4401 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12MoVH IS 1570 (Part 7) 12Cr12Ni2Mo
Match Breakdown
CHEMISTRY MATCH
63.7%
MECHANICAL MATCH
No shared data
OVERALL
63.7%
Specifications
Property ASTM A240/A240M S21640 ASTM A959 329
Standard ASTM A240/A240M:2025 ASTM A959:2011
Category Stainless Steel Stainless Steel
C (%) <=0.08 <=0.08
Mn (%) 3.50-6.50 <=1.00
P (%) <=0.060 <=0.040
S (%) <=0.030 <=0.030
Si (%) <=1.00 <=0.75
Cr (%) 17.5-19.5 23.0-28.0
Ni (%) 4.0-6.5 2.5-5.0
Mo (%) 0.50-2.00 1.00-2.00
N (%) 0.08-0.30 Not specified
Nb (%) 0.10-1.00 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 S21640 ASTM A959 329
Tensile Strength >=650 MPa Not specified
Yield Strength >=310 MPa Not specified
Elongation >=40% Not specified
Condition Plate, sheet and strip; yield by 0.2 percent offset Not specified
Typical Applications
ASTM A240/A240M S21640
Pressure vessels and general applications (plate, sheet and strip)
ASTM A959 329
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Key Differences
Can ASTM A240/A240M S21640 Be Substituted With ASTM A959 329?
ASTM A240/A240M S21640 and ASTM A959 329 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 S21640
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ASTM A959 329
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Frequently Asked Questions
What is the difference between ASTM A240/A240M S21640 and ASTM A959 329?
ASTM A240/A240M S21640 specifies N, Nb which are not specified for ASTM A959 329.
Can ASTM A240/A240M S21640 be substituted with ASTM A959 329?
ASTM A240/A240M S21640 and ASTM A959 329 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.