Annealing:
Annealed at 770 to 850°C. Soak thoroughly at this temperature and control furnace cool.
Hardening:
For best results harden 1.3247 in a vacuum or atmosphere furnace, or in a properly rectified salt bath. Pre heat throughly to 820 to 870°C, transfer to the high temperature furnace or salt bath. The exact hardening temperature to use depends on the type of work being treated, but in general 1.3247 tools should be hardened from the range of 1160 to 1180°C in salt, or 1180 to 1190°C in atmosphere or vacuum furnaces. After a short hold at the hardening temperature, quench the 1.3247 component without further soaking into salt at 540 to 595°C or warm oil. If salt quenched allow the 1.3247 component to equalise at the bath temperature and then complete the quench in still air. The maximum temperature of the 1.3247 tool before tempering shoud be 65°C. Larger components should not be allowed to remain at room temperature without tempering.
Tempering:
1.3247 components can be tempered between 510 to 595°C. For 1.3247 high speed steel components a minimum tempering temperature of 540°C is recommended to provide suitable relief to the hardening stresses. Triple tempering is recommended with a minimum of two hours at temperature per cycle. The 1.3247 components should be cooled in still air to room temperature between tempering treatments.
| Tempering °C |
500
|
550
|
600
|
|
HRc
|
70
|
67
|
63
|
