Thermal treatment method of wide and thick plate supporting roll
A heat treatment method and technology for supporting rollers, which are applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of low production efficiency and high production costs, and achieve the effects of improving service life, saving production costs, and reducing heat treatment risks.
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[0032] like figure 1 As shown, the heat treatment method of the wide and thick plate back-up roll of the present invention is used to heat-treat the surface of the back-up roll workpiece with a roll body length of 3500-4300 mm, comprising the following steps:
[0033] The first step is to warm up;
[0034] Keep the workpiece at a temperature of 300±10°C for 10-20 hours, then preheat the workpiece to 500-600°C at a heating rate of ≤30°C / h, and keep it warm. The holding time is ≥35 hours, so that the internal and external temperatures of the workpiece are uniform ;
[0035] The back-up roll workpiece must be preheated as a whole before rapid heating, so as to reduce the phenomenon of excessive internal and external stress of the roller body caused by subsequent rapid heating and cracking, and at the same time ensure the heating speed of differential temperature heating; the preheating temperature is 500~ 600°C is appropriate, and the preheating time should be able to ensure th...
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