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
Al
<=0.09
<=1.00
<=1.00
<=0.040
<=0.030
6.50-7.75
16.00-18.00
0.75-1.50
Mechanical Properties
Tensile Strength
<=1030 MPa
Yield Strength
<=380 MPa
Hardness
<=192 HB
Condition
Solution heat treated plate and strip; proof strength applies only when specified by the purchaser
More data from JIS G4305:2012
From the standard
Mechanical properties by heat treatment condition3 conditions
Condition
0.2 percent proof (MPa)
Tensile (MPa)
Elongation, thickness up to 3.0 mm (%)
Elongation, over 3.0 mm (%)
Solution treated
380 max
1030 max
20 or under (as printed)
20 or under (as printed)
RH950
1030 min
1230 min
-
4 min
TH1050
960 min
1140 min
3 min
5 min
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 condition3 conditions
Condition
HBW
HRC
HRBW or HRBS
HV
Solution treated
192 max
-
92 max
200 max
RH950
-
40 min
-
392 min
TH1050
-
35 min
-
345 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)3 settings
Solution treatment
1000 to 1100 deg C, rapid cooling
RH950
955 deg C +/-10 deg C, hold 10 min, air cool to room temperature, within 24 h cool to -73 deg C +/-6 deg C and hold 8 h, then 510 deg C +/-10 deg C hold 60 min, air cool
TH1050
760 deg C +/-15 deg C, hold 90 min, within 1 h cool to 15 deg C or below and hold 30 min, then 565 deg C +/-10 deg C hold 90 min, air cool
Annex JA is informative; temperatures are examples.
Source: JIS G 4305:2012, Table JA.5
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