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ASTM A240/A240M S32803 vs ASTM A959 S32950

Related Material — 60.7% match based on chemical composition and mechanical property overlap.

ASTM A240/A240M S32803 (ASTM A240/A240M:2025) and ASTM A959 S32950 (ASTM A959:2011) are both steel grades. Both fall under the Stainless Steel category. ASTM A240/A240M S32803 is typically used for pressure vessels and general applications (plate, sheet and strip), while ASTM A959 S32950 is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1). ASTM A240/A240M S32803 is defined under ASTM International, originating from United States, while ASTM A959 S32950 is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A240/A240M S32803 vs ASTM A959 S32950 is a 60.7% 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 60.7%.

Frequently Compared With ASTM A240/A240M S32803:
IS 1570 (Part 7) 12Cr12Ni2Mo ASTM A959 29-4-2 GOST 5632 08X18H10 EN 10088-1 1.4006 EN 10088-1 1.4301 EN 10088-1 1.4401 EN 10088-1 1.4845 ASTM A959 .- GB/T 3280 06Cr19Ni10 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoH ASTM A959 29-4
Match Breakdown
CHEMISTRY MATCH
60.7%
MECHANICAL MATCH
No shared data
OVERALL
60.7%
Specifications
Property ASTM A240/A240M S32803 ASTM A959 S32950
Standard ASTM A240/A240M:2025 ASTM A959:2011
Category Stainless Steel Stainless Steel
C (%) <=0.015 <=0.030
Mn (%) <=0.50 <=2.00
P (%) <=0.020 <=0.035
S (%) <=0.0035 <=0.010
Si (%) <=0.55 <=0.60
Cr (%) 28.0-29.0 26.0-29.0
Ni (%) 3.0-4.0 3.5-5.2
Mo (%) 1.80-2.50 1.00-2.50
N (%) <=0.020 0.15-0.35
Nb (%) 0.15-0.50 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 S32803 ASTM A959 S32950
Tensile Strength >=600 MPa Not specified
Yield Strength >=500 MPa Not specified
Elongation >=16% Not specified
Hardness <=241 HB Not specified
Condition Plate, sheet and strip; yield by 0.2 percent offset Not specified
Typical Applications
ASTM A240/A240M S32803
Pressure vessels and general applications (plate, sheet and strip)
ASTM A959 S32950
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Key Differences
Can ASTM A240/A240M S32803 Be Substituted With ASTM A959 S32950?
ASTM A240/A240M S32803 and ASTM A959 S32950 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 S32803
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ASTM A959 S32950
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Frequently Asked Questions
What is the difference between ASTM A240/A240M S32803 and ASTM A959 S32950?
ASTM A240/A240M S32803 specifies Nb which is not specified for ASTM A959 S32950.
Can ASTM A240/A240M S32803 be substituted with ASTM A959 S32950?
ASTM A240/A240M S32803 and ASTM A959 S32950 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.