BS4659 BD2 is a high carbon, high chromium, molybdenum, vanadium tool steel which offers good wear resistance, high surface hardness, through hardening properties, dimensional stability and high resistance to tempering effect. It is also suitable for vacuum hardening.

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

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

Stress Relieving: If machining operations have been heavy or if the tool has an unbalanced section, remove stresses before hardening by heating up to 700°C, equalise, then cool slowly.

Hardening: Pre heat to 750/780°C and thoroughly soak. Continue heating to the final hardening temperature of 1010/1030°C and allow the component to be heated through. Quench in oil or cool in air.

Tempering: Heat uniformly and thoroughly at the selected tempering temperatures and hold for at least one hour per inch of total thickness. Double tempering should be carried out with intermediate cooling to room temperature. For your guidance refer to our colour charts for forging, hardening and tempering.

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