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ASTM A240/A240M:2025 S31266 Steel: Specifications & Listings

ASTM A240/A240M:2025 S31266: S31266: austenitic (chromium-nickel or chromium-manganese-nickel) stainless steel plate, sheet and strip (UNS number, no type name printed). Specified in ASTM A240/A240M:2025.

Category: Stainless Steel
Grade Details
GradeASTM A240/A240M:2025 S31266
Standard ASTM A240/A240M:2025
ApplicationsPressure vessels and general applications (plate, sheet and strip)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
ASTM A959 S31266 ASTM A959:2011 USA No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A959 S31266 ASTM A959:2011 Strong Match
ASTM A276/A276M S31266 ASTM A276/A276M:2017 Strong Match
EN 10088-1 X1CrNiMoCuNW24-22-6 EN 10088-1:2014 Close Alternative
EN 10088-1 X1CrNiMoCuNW24-22-6 EN 10088-1:2023 Close Alternative
EN 10088-1 X1CrNiMoCuN24-22-8 EN 10088-1:2014 Related Material
EN 10088-1 X1CrNiMoCuN24-22-8 EN 10088-1:2023 Related Material
IS 6603 X01Cr24Ni22Mo4CuNW IS 6603:2024 Related Material
EN 10088-3 X1CrNiMoCuNW24-22-6 EN 10088-3:2014 Related Material
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C Mn P S Si Cr Ni Mo N Cu W
<=0.030 2.00-4.00 <=0.035 <=0.020 <=1.00 23.0-25.0 21.0-24.0 5.2-6.2 0.35-0.60 1.00-2.50 1.50-2.50
Mechanical Properties
Tensile Strength >=750 MPa
Yield Strength >=420 MPa
Elongation >=35%
Condition Plate, sheet and strip; yield by 0.2 percent offset

More data from ASTM A240/A240M:2025

From the standard
Mechanical properties 1 condition(s)
Product or thicknessTensile strength, min (MPa)Yield strength, min (MPa)Elongation in 50 mm, min (%)
All75042035
Minimum values; yield strength by the 0.2 percent offset method.
Source: ASTM A240/A240M:2025, Table 2
Cold bend 1 value
Cold bend angle
not required
Bend tests are not required for chromium steels thicker than 1 in. [25 mm] or for any austenitic or duplex steel regardless of thickness.
Source: ASTM A240/A240M:2025, Table 2

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