1.2379/D2 is a high carbon, high chromium, molybdenum, vanadium, air hardening tool steel which offershigh surface hardness, good wear resistance, through hardening properties, dimensional stability and high resistance to tempering effect. 1.2379/D2 tool steel is also suitable for vacuum hardening.
    C              Si            Mn             P/S          Cr                Mo            V
1.45-1.60  0.10-0.60   0.20-0.60   <=0.030   11.00-13.00   0.60-1.00   0.90-1.00


Forging:
Heat slowly and uniformly to 700°C then more rapidly to 900/1040°C.  After forging 1.2379 cool slowly.

Annealing:
Anneal at 850°C and slow furnace cool. Hardness after annealing will be approx. 225 brinell.

Hardening:
Pre heat the 1.2379/D2 component slowly to 750/780°C and thoroughly soak. Continue heating to the final hardening temperature of 1000/1030°C and allow the component to be heated through. Quench in oil or cool in air.