Graphite electrodes are conductive rods used in electric arc furnace (EAF) for steelmaking. They are electrical heated to melt scrap steel, and 80% of graphite electrodes in the world are used in EAF.
Graphite electrode is a conductive material that saves the cost of steelmaking. Since graphite can withstand a high temperature of 3900℃, it’s suitable for using in EAF (the temperature in the EAF is above 3000℃).
The graphite electrode has a simple structure, which is composed of a rod and a nipple. The bodies are connected by a threaded joint. Usually, three or four electrodes connected by joints make a long column, then the column will be inserted in to EAF.
Types of Graphite Electrodes
The graphite electrode manufacturing process includes the following main processes. Calcinating raw materials (petroleum coke and needle coke) and then blending with coal tar pitch to form a dense paste. After baking, impregnating, graphitizing and machining, the finished product is called graphite electrode.
According to the power level, graphite electrodes are mainly divided into three grades: RP, HP, and UHP. Some manufacturers will also subdivide HD, IP, SHP grades.
RP – Regular Power.
HP – High Power.
HD – High Density.
UHP – Ultra High Power.
SHP – Super High Power.
Guide to Graphite Electrodes
Size & Weight Chart
Graphite electrodes applications
Graphite electrodes are widely used in EAF for smelting of steel, alloy steel, various alloys and nonmetals melting.
The EAF steelmaking technology has been developed for more than 100 years. The worldwide steel produced by EAF accounts for about 1/3 of the total steel output. The application of EAF steelmaking accounts for 80% in it of graphite electrodes.
EAF is divided into DC electric arc furnace and AC electric arc furnace. The power level of EAF and the power level of the graphite electrode need to be matched. In addition, the EAF steelmaking capacity is different, so the graphite electrode diameter is also different.