How to ensure the temperature difference between the core and the surface of the round steel heated by the induction heating furnace?

In the case of the shortest heating time of the induksjonsvarmeovn, the temperature difference between the core and the surface required by the process is guaranteed, that is, the current frequency is required to be appropriately reduced. High electrical efficiency and short heating time make the local heat inevitably generated by local heating, and the heat conduction to the non-heating part of the blank will be less. Therefore, the efficiency of local induction heating basically depends on the correct selection of the current frequency. The current frequency can be selected according to the smallest diameter of the round steel billet.