ASTM A240/A240M:2025 S44537: S44537: ferritic or martensitic (chromium) stainless steel plate, sheet and strip (UNS number, no type name printed). Specified in ASTM A240/A240M:2025.
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
Cu
Al
W
Nb
Ti
La
<=0.030
<=0.8
<=0.050
<=0.006
0.1-0.6
20.0-24.0
<=0.5
<=0.04
<=0.5
<=0.1
1.0-3.0
0.2-1.0
0.02-0.20
0.04-0.20
Mechanical Properties
Tensile Strength
>=450 MPa
Yield Strength
>=320 MPa
Elongation
>=18%
Hardness
<=200 HB
Condition
Plate, sheet and strip; yield by 0.2 percent offset
More data from ASTM A240/A240M:2025
From the standard
Mechanical properties1 condition(s)
Product or thickness
Tensile strength, min (MPa)
Yield strength, min (MPa)
Elongation in 50 mm, min (%)
All
450
320
18
Minimum values; yield strength by the 0.2 percent offset method. The minimum elongation for plates thicker than 0.630 in. [16 mm] shall be 8 %.
Source: ASTM A240/A240M:2025, Table 2
Hardness1 condition(s)
Product or thickness
Brinell HBW, max
Rockwell, max
All
200
93 HRBW
Maximum values; either Brinell or Rockwell scale may be used.
Source: ASTM A240/A240M:2025, Table 2
Cold bend1 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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