Heat treatment process for die steel
A technology of die steel and preliminary heat treatment, which is applied in the field of steel heat treatment process, can solve problems such as brittle cracking, and achieve the effects of eliminating quenching stress, reducing thermal stress, high hardness and wear resistance
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[0009] Below in conjunction with embodiment the present invention will be further described, and its operating steps are as follows:
[0010] A heat treatment process for mold steel, the process method comprising the following steps:
[0011] (1) Preliminary heat treatment: Isothermal spheroidizing annealing should be carried out immediately after forging, heating temperature: 840-860°C, heat preservation for 2-4h; then cool to 720-740°C, hold constant temperature for 4-6h, cool to below 500°C and leave the furnace for air cooling ;
[0012] (2) Quenching and tempering: Quenching temperature 1100-1150°C, oil cooling; tempering temperature 530-540°C, tempering 2-3 times, each holding 1.0-2.0h, hardness 57-63HRC.
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