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
>=0.15
<=1.00
<=0.040
<=0.030
<=1.00
12.0-14.0
<=0.75
<=0.50
Mechanical Properties
Tensile Strength
<=690 MPa
Elongation
>=15%
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 properties1 condition(s)
Product or thickness
Tensile strength, min (MPa)
Yield strength, min (MPa)
Elongation in 50 mm, min (%)
All
690 max
-
15
Minimum values; yield strength by the 0.2 percent offset method. Tensile strength is a maximum; Type 420 is usually used in the heat treated condition.
Source: ASTM A240/A240M:2025, Table 2
Hardness1 condition(s)
Product or thickness
Brinell HBW, max
Rockwell, max
All
217
96 HRBW
Maximum values; either Brinell or Rockwell scale may be used.
Source: ASTM A240/A240M:2025, Table 2
Cold bend1 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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