2. Chemical composition:
| Element |
Percentage (%) |
| C | 0.15 ~ 0.3 |
| Si |
0.15 ~ 0.3 |
| Mn | 0.25 ~ 0.3 |
| Cr | 3.8 ~ 4.5 |
| Mo | 4.8 ~ 5.0 |
| W | 6.0~7.0 |
| V | 1.8~2.3 |
| P | ≤0.03 |
| S | ≤0.01 |
|
Process
|
Conditions
|
|
Annealing
|
800 ~ 880°C
|
|
Quenching
|
Slow cooling
|
|
Quenching Medium
|
≤255
|
|
Tempering
|
1200~1220°C
|
|
Tempering Medium
|
Oil quenching
|
|
Hardness (HRC)
|
550 ~ 750 HRC
|
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