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ASTM A240/A240M:2025 S44400 Steel: Specifications & Listings

ASTM A240/A240M:2025 S44400: S44400 (type 444): ferritic or martensitic (chromium) stainless steel plate, sheet and strip (UNS S44400). Specified in ASTM A240/A240M:2025. Combined limit (percent): Ti + Nb at most 0.80.

Category: Stainless Steel
Grade Details
GradeASTM A240/A240M:2025 S44400
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 444 ASTM A959:2011 USA No activity yet
ASTM A276/A276M S44400 ASTM A276/A276M:2017 USA No activity yet
EN 10088-1 X2CrMoSiS18-2-1 EN 10088-1:2023 Europe (CEN) No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A959 444 ASTM A959:2011 Strong Match
ASTM A276/A276M S44400 ASTM A276/A276M:2017 Strong Match
EN 10088-1 X2CrMoSiS18-2-1 EN 10088-1:2023 Strong Match
ASTM A959 S18235 ASTM A959:2011 Close Alternative
JIS G4304 SUS444 JIS G4304:2021 Close Alternative
JIS G4305 SUS444 JIS G4305:2012 Close Alternative
ASTM A959 XM-18 ASTM A959:2011 Related Material
ASTM A959 316L 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 Mo N
<=0.025 <=1.00 <=0.040 <=0.030 <=1.00 17.5-19.5 <=1.00 1.75-2.50 <=0.035
Mechanical Properties
Tensile Strength >=415 MPa
Yield Strength >=275 MPa
Elongation >=20%
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 (%)
All41527520
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
All21796 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
180 deg
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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