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ASTM A959 S21800 vs ASTM A240/A240M S21800

Strong Match — 100% match based on chemical composition and mechanical property overlap.

ASTM A959 S21800 (ASTM A959:2011) and ASTM A240/A240M S21800 (ASTM A240/A240M:2025) are both steel grades. Both fall under the Stainless Steel category. ASTM A959 S21800 is typically used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1), while ASTM A240/A240M S21800 is commonly used for pressure vessels and general applications (plate, sheet and strip). ASTM A959 S21800 is defined under ASTM International, originating from United States, while ASTM A240/A240M S21800 is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A959 S21800 vs ASTM A240/A240M S21800 is a 100% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a strong match overall at 100%.

Frequently Compared With ASTM A959 S21800:
GOST 5632 08X18H10 GOST 5632 06Kh23N28 EN 10088-1 1.4006 EN 10088-1 1.4845 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12MoVH ASTM A959 .- EN 10088-1 1.4301 IS 1570 (Part 7) 12Cr12Ni2Mo GB/T 3280 06Cr19Ni10 EN 10088-1 1.4401
Match Breakdown
CHEMISTRY MATCH
100%
MECHANICAL MATCH
No shared data
OVERALL
100%
Specifications
Property ASTM A959 S21800 ASTM A240/A240M S21800
Standard ASTM A959:2011 ASTM A240/A240M:2025
Category Stainless Steel Stainless Steel
C (%) <=0.10 <=0.10
Cr (%) 16.0-18.0 16.0-18.0
Mn (%) 7.0-9.0 7.00-9.00
N (%) 0.08-0.18 0.08-0.18
Ni (%) 8.0-9.0 8.0-9.0
P (%) <=0.060 <=0.060
S (%) <=0.030 <=0.030
Si (%) 3.5-4.5 3.5-4.5
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property ASTM A959 S21800 ASTM A240/A240M S21800
Tensile Strength Not specified >=655 MPa
Yield Strength Not specified >=345 MPa
Elongation Not specified >=35%
Hardness Not specified <=241 HB
Condition Not specified Plate, sheet and strip; yield by 0.2 percent offset
Typical Applications
ASTM A959 S21800
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
ASTM A240/A240M S21800
Pressure vessels and general applications (plate, sheet and strip)
Can ASTM A959 S21800 Be Substituted With ASTM A240/A240M S21800?
ASTM A959 S21800 and ASTM A240/A240M S21800 overlap closely enough on chemistry and mechanical properties that ASTM A240/A240M S21800 is often considered as a substitute for ASTM A959 S21800 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
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ASTM A959 S21800
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ASTM A240/A240M S21800
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Frequently Asked Questions
What is the difference between ASTM A959 S21800 and ASTM A240/A240M S21800?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A959 S21800 be substituted with ASTM A240/A240M S21800?
ASTM A959 S21800 and ASTM A240/A240M S21800 overlap closely enough on chemistry and mechanical properties that ASTM A240/A240M S21800 is often considered as a substitute for ASTM A959 S21800 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.