D2 steel heat treatment process

    D2 steel heat treatment methods:
    Stress relief annealing: the workpiece after rough machining, heating to 600~650 ℃, thermal insulation for 2 hours, with the furnace cooling to 500 ℃, followed by air cooling.
    Quenching: for the first time preheating, slowly warming the workpiece to 600 ℃, heat 20 minutes. After temperature uniformity, the second time preheating temperature was raised to 850 ℃, incubated for 30 minutes. Finally heated to 1020 ~ 1040 ℃, heat 25 to 40 minutes, followed by air cooling.
    Tempering: immediately tempering after quenching, and tempering at least twice, each holding time is not less than 2 hours.
    D2 steel heat treatment matters needing attention:
    After quenching, should be timely tempering, prevent cracking, and to prevent surface decarburization, for the manufacture of high precision die and gauge of D2 steel should be cryogenic treatment (-70 ℃), and the use of high-temperature tempering, To reduce the workpiece deformation, high temperature tempering temperature 500 ~ 560 ℃, hardness greater than 58HRC.
   

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