Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Si
Mn
P
S
Cr
Ni
0.26-0.40
<=1.00
<=1.00
<=0.040
<=0.030
12.00-14.00
<=0.60
Mechanical Properties
Tensile Strength
>=540 MPa
Yield Strength
>=225 MPa
Elongation
>=18%
Hardness
<=235 HB
Condition
Annealed plate and strip; proof strength applies only when specified by the purchaser
More data from JIS G4304:2021
From the standard
Mechanical properties, annealed3 values
0.2 percent proof strength, min
225 MPa
Tensile strength, min
540 MPa
Elongation, min
18 %
0.2 percent proof strength applies only when specified by the purchaser. 1 N/mm2 = 1 MPa.
Source: JIS G 4304:2021, Table 12
Hardness, annealed3 scales
Brinell hardness HBW, max
235
Rockwell HRBW or HRBS, max
99
Vickers hardness HV, max
247
Any one of the hardness scales applies; if not specified the manufacturer selects. HRBW is used in case of dispute.
Source: JIS G 4304:2021, Table 12
Hardness, quenched and tempered1 value
Rockwell HRC, min
40
Applies when quenched and tempered at the purchaser's specification.
Source: JIS G 4304:2021, Table 13
Heat treatment (example, informative)3 settings
Annealing
about 750 deg C rapid cooling, or 800 to 900 deg C slow cooling
Hardening
980 to 1040 deg C, rapid cooling
Tempering
150 to 400 deg C, air cooling
Annex JA is informative; temperatures are examples.
Source: JIS G 4304:2021, Table JA.4
Active JIS G4304:2021 SUS420J2 Listings on M-EX (For Sale)