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ASTM A240/A240M S32550 vs ASTM A959 .-

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

ASTM A240/A240M S32550 (ASTM A240/A240M:2025) and ASTM A959 .- (ASTM A959:2011) are both steel grades. Both fall under the Stainless Steel category. ASTM A240/A240M S32550 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 S32550 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 S32550 vs ASTM A959 .- is a 57.2% 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 S32550:
EN 10088-1 1.4006 EN 10088-1 1.4301 GOST 5632 08X18H10 EN 10088-1 1.4845 ASTM A959 255 IS 1570 (Part 7) 12Cr12MoH ASTM A959 2205 ASTM A959 26-3-3 GB/T 3280 06Cr19Ni10 GOST 5632 06Kh23N28 EN 10088-1 1.4401 IS 1570 (Part 7) 11Cr17Ni13W3TiH
Match Breakdown
CHEMISTRY MATCH
57.2%
MECHANICAL MATCH
No shared data
OVERALL
35%
Specifications
Property ASTM A240/A240M S32550 ASTM A959 .-
Standard ASTM A240/A240M:2025 ASTM A959:2011
Category Stainless Steel Stainless Steel
C (%) <=0.04 <=0.030
Mn (%) <=1.50 <=1.00
P (%) <=0.040 <=0.040
S (%) <=0.030 <=0.030
Si (%) <=1.00 <=1.00
Cr (%) 24.0-27.0 18.0-20.0
Ni (%) 4.5-6.5 <=0.50
Mo (%) 2.9-3.9 Not specified
N (%) 0.10-0.25 <=0.030
Cu (%) 1.50-2.50 Not specified
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.
Mechanical Properties
Property ASTM A240/A240M S32550 ASTM A959 .-
Tensile Strength >=760 MPa Not specified
Yield Strength >=550 MPa Not specified
Elongation >=15% Not specified
Hardness <=302 HB Not specified
Condition Plate, sheet and strip; yield by 0.2 percent offset Not specified
Typical Applications
ASTM A240/A240M S32550
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 S32550 Be Substituted With ASTM A959 .-?
ASTM A240/A240M S32550 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 S32550
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ASTM A959 .-
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Frequently Asked Questions
What is the difference between ASTM A240/A240M S32550 and ASTM A959 .-?
ASTM A240/A240M S32550 specifies Mo, Cu which are not specified for ASTM A959 .-. ASTM A959 .- specifies Cb, Ti which are not specified for ASTM A240/A240M S32550.
Can ASTM A240/A240M S32550 be substituted with ASTM A959 .-?
ASTM A240/A240M S32550 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.