Heat treatment method of M2 high-speed steel work roller
A heat treatment method and work roll technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of quenching oil fire hazards, large oil pollution on the surface of the rolls, and high labor intensity of operators, so as to improve the quenching stress state, improve the Heat utilization rate, effect of reducing cracking phenomenon
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Embodiment 1
[0037] The diameter of the M2 high speed steel work roll in this embodiment is 40.5m. The equipment used includes well-type resistance furnace and hot air circulation tempering furnace. The following is the specific heat treatment process:
[0038] 1) One-time preheating: hang the roll on the sling and vertically hoist it into the well-type resistance furnace, raise the temperature in the well-type resistance furnace to 520°C at a rate of 80°C / h and keep it warm; the holding time is 1h;
[0039] 2) Secondary preheating: continue heating the roll to 830°C at a rate of 120°C / h and keep it warm; the hold time is 1h;
[0040] 3) High temperature heating: raise the roll to 1180°C at a speed of 65°C / h, and keep it warm; the hold time is 30min;
[0041] 4) Cooling: The rolls heated at high temperature and kept warm are cooled by water-based quenching liquid, the rolls are vertically placed in the water-based quenching liquid, and the rolls are cooled to 330°C;
[0042] 5) Temperin...
Embodiment 2
[0045] The diameter of the M2 high speed steel work roll in this embodiment is 83m. The equipment used includes well-type resistance furnace and hot air circulation tempering furnace. The following is the specific heat treatment process:
[0046] 1) One-time preheating: Hang the roll on the sling and vertically hoist it into the well-type resistance furnace, raise the temperature in the well-type resistance furnace to 560°C at a rate of 70°C / h and keep it warm; the holding time is 2h;
[0047] 2) Secondary preheating: continue heating the roll to 865°C at a rate of 110°C / h and keep it warm; the hold time is 2h;
[0048] 3) High-temperature heating: raise the roll to 1200°C at a speed of 60°C / h, and keep warm; the hold time is 65min;
[0049] 4) Cooling: The rolls heated at high temperature and kept warm are cooled by water-based quenching liquid, the rolls are vertically placed in the water-based quenching liquid, and the rolls are cooled to 365°C;
[0050] 5) Tempering tre...
Embodiment 3
[0053] The diameter of the M2 high speed steel work roll in this embodiment is 58m. The equipment used includes well-type resistance furnace and hot air circulation tempering furnace. The following is the specific heat treatment process:
[0054] 1) One-time preheating: Hang the roll on the sling and vertically hoist it into the well-type resistance furnace, raise the temperature in the well-type resistance furnace to 500°C at a rate of 100°C / h and keep it warm; the holding time is 0.5h;
[0055] 2) Secondary preheating: continue heating the roll to 800°C at a rate of 50°C / h and keep it warm; the hold time is 0.5h;
[0056] 3) High temperature heating: raise the roll to 1150°C at a speed of 50°C / h, and keep it warm; the hold time is 10 minutes;
[0057] 4) Cooling: The rolls heated at high temperature and kept warm are cooled by water-based quenching liquid, the rolls are vertically placed in the water-based quenching liquid, and the rolls are cooled to 300°C;
[0058] 5) T...
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