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ASTM A240/A240M:2025 S21800 Steel: Specifications & Listings

ASTM A240/A240M:2025 S21800: S21800: 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 S21800
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 S21800 ASTM A959:2011 USA No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A959 S21800 ASTM A959:2011 Strong Match
ASTM A276/A276M S21800 ASTM A276/A276M:2017 Strong Match
IS 1570 (Part 5) X20Cr13 IS 1570 (Part 5):1985 Related Material
IS 1570 (Part 5) X30Cr13 IS 1570 (Part 5):1985 Related Material
ASTM A959 201 ASTM A959:2011 Related Material
ASTM A959 S20161 ASTM A959:2011 Related Material
ASTM A959 202 ASTM A959:2011 Related Material
ASTM A959 S20430 ASTM A959:2011 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 N
<=0.10 7.00-9.00 <=0.060 <=0.030 3.5-4.5 16.0-18.0 8.0-9.0 0.08-0.18
Mechanical Properties
Tensile Strength >=655 MPa
Yield Strength >=345 MPa
Elongation >=35%
Hardness <=241 HB
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 (%)
All65534535
Minimum values; yield strength by the 0.2 percent offset method.
Source: ASTM A240/A240M:2025, Table 2
Hardness 1 condition(s)
Product or thicknessBrinell HBW, maxRockwell, max
All241100 HRBW
Maximum values; either Brinell or Rockwell scale may be used.
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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