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
Ni
Cr
Cu
Nb
<=0.07
<=1.00
<=1.00
<=0.040
<=0.030
3.00-5.00
15.00-17.50
3.00-5.00
0.15-0.45
Mechanical Properties
Hardness
<=363 HB
Condition
Solution heat treated plate and strip (no strength values specified; aged conditions are in the blocks)
More data from JIS G4305:2012
From the standard
Mechanical properties by heat treatment condition5 conditions
Condition
0.2 percent proof, min (MPa)
Tensile, min (MPa)
Elongation, thickness up to 5.0 mm, min (%)
Elongation, over 5.0 to 15.0 mm, min (%)
Elongation, over 15.0 mm, min (%)
Solution treated
-
-
-
-
-
H900
1175
1310
5
8
10
H1025
1000
1070
5
8
12
H1075
860
1000
5
9
13
H1150
725
930
8
10
16
0.2 percent proof strength applies only when specified by the purchaser. 1 N/mm2 = 1 MPa.
Source: JIS G 4305:2012, Table 14
Hardness by heat treatment condition5 conditions
Condition
HBW
HRC
Solution treated
363 max
38 max
H900
375 min
-
H1025
331 min
-
H1075
302 min
31 min
H1150
277 min
28 min
Any one of the hardness scales applies; if not specified the manufacturer selects. HRBW is used in case of dispute.
Source: JIS G 4305:2012, Table 14
Heat treatment (example, informative)5 settings
Solution treatment
1020 to 1060 deg C, rapid cooling
H900
470 to 490 deg C, air cooling
H1025
540 to 560 deg C, air cooling
H1075
570 to 590 deg C, air cooling
H1150
610 to 630 deg C, air cooling
Annex JA is informative; temperatures are examples.
Source: JIS G 4305:2012, Table JA.5
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