Technical Description of Graphite Electrode

1. Varieties of graphite electrode

Electric arc steelmaking furnaces are generally divided into three categories, namely ordinary power electric furnaces, high power electric furnaces and ultra-high power electric furnaces. Corresponding to the power level of electric furnace steelmaking, there are three types of graphite electrodes, namely ordinary power graphite electrodes (code RP grade), high power graphite electrodes (code HP grade) and ultra-high power graphite electrodes (code UHP grade) ). The nominal diameter of the electrode ranges from 75mm to 700mm. The physical and chemical properties of high-power and ultra-high-power graphite electrode are better than those of ordinary power graphite electrode, such as low electrical resistivity, high volume density, high mechanical strength, low linear expansion coefficient, and excellent oxidation resistance.

2. Selection of Graphite Electrode for AC Arc Steelmaking Furnace

Electric furnaces of different power should use different types of graphite electrodes, such as high-power electric furnaces should use high-power electrodes. Different power electric furnaces have different choices of graphite electrode diameter. It is generally believed that ordinary power furnaces choose RP electrodes with diameters of 75-500mm; high-power electric furnaces choose electrodes with diameters greater than 300mmHP; ultra-high power furnaces choose UHP electrodes with diameters greater than 400mm.

Problems that should be paid attention to in the use of conical joints to connect electrodes: The biggest advantage of conical joints is that the longitudinal section of the hole wall of the electrode connection hole is tapered. The outer wall is thin, the inner wall is thick, the overall strength is large, and it is not easy to burst. The diameter of the middle of the joint is large and it is not easy to be broken.