Forging:
Forge at 1150°C.
Annealing:
Slow furnace cool from 840°/900°C.
Hardening:
Pre heat slowly to 650/700°C and thoroughly soakthe 250A58 component. Continue heating to the final hardening temperature of 870/930°C and allow the component to be heated through. Quench in oil.
Tempering:
Temper immediately after quenching whilst the 250A58 tools are still hand warm. Re-heat to the tempering temperature, soak for one hour per 25 millimetre of total thickness, 2 hours minimum, then cool in air. For most applications tempering will be between 400°/550°C.
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