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Chemical Composition & Physical Properties
JIS G4313
|
Symbol of grade
|
C
|
Si
|
Mn
|
P
|
S
|
Cr |
|
SUS 420J2-CSP
|
0.26 to 0.40
|
1.00 max.
|
1.00 max.
|
0.040 max. | 0.030 max. |
12.00 to 14.00
|
|
Symbol of grade
|
Symbol of temper
|
As cold rolled, or eighter as solution-treated or as annealed
|
As precipitation-hardened
|
||
|
Hardness HV
|
Bendability
V-bend |
Symbol of beat treatment
|
Hardness HV
|
||
|
SUS 420J2-CSP
|
0
|
247min.
|
-
|
- |
-
|
Note (1) The temper symbol SEH denotes that this is within the range specified as the temper symbol EH, and it shall be applied when especially designated by the purchaser.
Remarks:
1. The bendability is given by the inside radius, and the angle of bending shall be 90°. The bend test shall be applied when designated by the purchaser.
2. The precipitation hardening heat treatment for SUS 631-CSP shall be as specified below:
(1) For the strip with temper symbol 0:
TH1050: After solution treatment (1000℃ to 1100℃, rapid cooling), hold at 760 ±15℃ for 90 min, cool down to 15℃ or below within 1 h, hold for 30 min, hold at 565 ± 10℃ for 90 min and air-cool.
RH950: After solution treatment (1000℃ to 1100℃, rapid cooling), hold at 955 ± 10℃ for 10 min, air-cool down to room temperature, cool down to -73 ±6℃ within 24 h, hold for 8 h, hold at 510 ± 10℃ for 60 min and air-cool.
(2) For the strip with temper symbol 1/2H, 3/4H, and H:
CH: Hold at 475±10℃ for 1h and air-cool.
3. The precipitation hardening heat treatment for SUS 632J1-CSP SHALL BE AS SPECIFIED BELOW:
CH: Hold at 475 ± 10℃ for 1 h and air-cool.
4. The annealing for SUS 420J2-CSP (for temper symbol 0) shall be as specified below:
Air-cool at about 750℃ or slow-cool at 800 to 900 C.