Hardening and tempering process of alloy-steel pipe
An alloy steel pipe, quenching and tempering technology, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of poor wear resistance, low hardness and large deformation, and achieve the effect of good wear resistance, high hardness and small deformation
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Embodiment 1
[0012] A quenching and tempering process for alloy steel pipes, comprising the steps of:
[0013] 1) Annealing treatment: heat up to 720°C at a rate of 55°C / min, hold for 2.5 hours, then cool to 570°C at a rate of 30°C / min, and then cool to room temperature at a rate of 5°C / min;
[0014] 2) Quenching treatment: heat up to 810°C at a rate of 25°C / min, hold for 3.5 hours, then spray with 35% salt water to rapidly cool to 260°C at a rate of 255°C / s, and then heat at 15°C / min The speed is cooled to 80°C;
[0015] 3) Tempering treatment: heat up to 710°C at a rate of 35°C / min, hold for 8 hours, and then cool to room temperature at a rate of 10°C / min.
Embodiment 2
[0017] A quenching and tempering process for alloy steel pipes, comprising the steps of:
[0018] 1) Annealing treatment: heat up to 700°C at a rate of 50°C / min, hold for 1.5 hours, then cool to 570°C at a rate of 30°C / min, and then cool to room temperature at a rate of 5°C / min;
[0019] 2) Quenching treatment: heat up to 800°C at a rate of 20°C / min, hold for 2.5 hours, then spray with 30% brine to rapidly cool to 250°C at a rate of 250°C / s, and then heat at 15°C / min The speed is cooled to 70°C;
[0020] 3) Tempering treatment: heat up to 700°C at a rate of 30°C / min, hold for 7 hours, and then cool to room temperature at a rate of 10°C / min.
Embodiment 3
[0022] A quenching and tempering process for alloy steel pipes, comprising the steps of:
[0023] 1) Annealing treatment: heat up to 710°C at a rate of 52°C / min, hold for 2 hours, then cool to 570°C at a rate of 30°C / min, and then cool to room temperature at a rate of 5°C / min;
[0024] 2) Quenching treatment: heat up to 804°C at a rate of 23°C / min, hold for 3 hours, then spray with 32% brine to rapidly cool to 257°C at a rate of 253°C / s, and then heat at 15°C / min The speed is cooled to 76°C;
[0025] 3) Tempering treatment: heat up to 702°C at a rate of 33°C / min, hold for 7.5 hours, and then cool to room temperature at a rate of 10°C / min.
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