ow-sulphur tool steel, supplied in pre-toughened condition;
due to its nickel content, it features uniform strength even with
maximum plate dimensions
already pre-toughened, usually no heat treatment required
Annealing:
710 to 740 °C for about 2 to 5 hours
slow controlled cooling of 10 to 20 °C per hour to about 600 °C
further cooling in air, max. 235 HB