1) Ordinary graphite electrodes are used in general industrial power electric arc furnaces, which allow the current density to be lower than 17A/cm2, and are mainly used for making ordinary steel, silicon and yellow phosphorus, etc.
2) High-power graphite electrodes are used in high-power electric arc furnaces, which allow a current density of 18~25A/cm2, and are mainly used for steelmaking.
3) Ultra-high power graphite electrodes are used in electric arc furnaces of the same power, which allow a current density greater than 25A/cm2, and are mainly used for melting refined steel and special steel.
In addition, in the field of electrolytic metals, graphite electrodes are also used to electrolyze metal magnesium, aluminum, and sodium. The anodes in the electrolytic cell also use graphite electrodes, and the furnace heads used to produce emery in resistance furnaces also use graphite electrodes.