T1 HIGH-SPEED STEEL
| HEAT TREATMENT |
| Soft annealing | Cooling | Annealed hardness in HB | |||
| 770 - 840 | Furnace | 240 - 300 | |||
| 1st pre-heating | 2nd and 3rd pre-heating | Hardening from |
In | Tempering | Hardness after tempering HRC |
| up to approx. 400°C in air circulating furnace |
a) 850 b) 850 and 1050 |
1240°C to 1290°C |
a) hot bath 550°C / air
or b) oil c) air |
min. two times 550°C - 570°C |
63 - 66 |