中频加热炉是一种将工频50HZ交流电转变为中频(300HZ以上至1000HZ)的电源装置，把三相工频交流电，整流后变成直流电，再把直流电变为可调节的中频电流，供给由电容和感应线圈里流过的中频交变电流，在感应圈中产生高密度的磁力线，并切割感应圈里盛放的金属材料，在金属材料中产生很大的涡流，达到对金属加热的效果。钢坯加热根据钢种的不同温度在1050-1150°之间。

       Intermediate frequency heating furnace is a power device that converts the power frequency 50HZ alternating current into intermediate frequency (above 300HZ to 1000HZ), converts the three-phase power frequency alternating current into direct current after recircating, and then converts the direct current into adjustable intermediate frequency current, which supplies intermediate frequency alternating current flowing through the capacitor and induction coil to generate high density magnetic force lines in the induction coil. And cut the metal material in the induction ring, produce a large eddy current in the metal material, to achieve the effect of heating the metal. The billet is heated between 1050-1150° depending on the type of steel.