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ASTM A240/A240M:2025 S33550 Steel: Specifications & Listings

ASTM A240/A240M:2025 S33550: S33550: 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. Combined limit (percent): La + Ce 0.025-0.070.

Category: Stainless Steel
Grade Details
GradeASTM A240/A240M:2025 S33550
Standard ASTM A240/A240M:2025
ApplicationsPressure vessels and general applications (plate, sheet and strip)
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A959 310HCbN ASTM A959:2011 Close Alternative
ASTM A959 310H ASTM A959:2011 Close Alternative
ASTM A959 310HCb ASTM A959:2011 Close Alternative
ASTM A959 309HCb ASTM A959:2011 Close Alternative
IS 11169 (Part 2) X12Cr13 IS 11169 (Part 2):2023 Related Material
ASTM A959 304H ASTM A959:2011 Related Material
ASTM A959 309H ASTM A959:2011 Related Material
ASTM A959 321H 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 Nb
0.04-0.10 <=1.50 <=0.040 <=0.030 <=1.00 25.0-28.0 16.5-20.0 0.18-0.25 0.05-0.15
Mechanical Properties
Tensile Strength >=600 MPa
Yield Strength >=280 MPa
Elongation >=35%
Hardness <=217 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 (%)
All60028035
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
All21795 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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