To prevent the occurrence of heating deformation, it is preferable to heat slowly and carry out preheat treatment. In general steel, when preheating temperature is selected, the preheating temperature can be selected according to the following criteria:
(1) The preheating temperature is below the metamorphic point. For example, ordinary steel is about 650~700 °C, and high speed steel is about 800~850 °C.
(2) The preheating temperature is about 500 °C.
(3) Two-stage preheating, first preheating at about 500 °C, and after preheating for a period of time, the preheating temperature is raised to below the A1 metamorphic point.
(4) Three-stage preheating, for large steels containing high alloys, such as high-speed steel, sometimes need to be preheated at 1000~1050 °C for the third stage.
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