What are the methods of DIN 1.2379 steel heat treatment

    Thermal processing of DIN 1.2379 steel:
Start temperature 1050 ℃, end temperature 850 ℃, furnace cooling.
    Softening annealing treatment:
In the protection of gas, heating to 800~850 ℃, then by 10 ℃ /h speed cooling to 600 ℃, then the air cooling, the hardness is less than or equal to 250HBw.
    To eliminate stress treatment:
If want to eliminate the residual stress generated after rough machining, mold should be heated to 650 ℃, heat 2h, and then with the furnace cooling to 500 ℃, then followed by air cooling.
    DIN 1.2379 steel quenching and tempering:
The first preheating temperature 550 ~ 600 ℃, maintained at about 30min per 25mm; the second preheating temperature 800 ~ 850 ℃, maintained at about 30min per 25mm; austenitizing temperature 975 ~ 1040 ℃, maintained at about 30min per 25mm , oil cooling (40 ~ 70 ℃) or gas cooling, cooled to 50 ~ 70mm immediately tempered.
1) low-temperature tempering: tempering temperature 150 ~ 200 ℃, each 25mm for about 60min above, air cooling, hardness ≥61HRC. Tempering should choose a lower austenitizing temperature 975 ~ 1025 ℃.
2) high-temperature tempering: tempering temperature 480 ~ 540 ℃, each 25mm for about 60min or more, air cooling, more than twice tempered, hardness ≥58HRC. Tempering should use a higher austenitizing temperature 1000 ~ 1040 ℃.
    Cryogenic treatment of 1.2379 steel:
After hardening, the workpiece is immediately cooled to between -80℃~ -70℃, maintaining 3 ~ 4h, then tempering. Cryogenic treatment can improve the hardness 1 ~ 3HRC.
    The aging treatment:
Temperature of 110 ~ 140 ℃, thermal insulation 25 ~ 100h, in order to ensure that the workpiece size and stability during use.

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