HP Graphite Electrode is mainly made of petroleum coke and needle coke, and coal tar is used as binder. It is made by calcination, compounding, kneading, pressing, roasting, graphitization and machining. It is used to discharge electric energy in the form of electric arc in electric arc furnace. The conductor that heats and melts the charge can be divided into ordinary power, high power and ultra high power according to its quality index.
(1) Ordinary power graphite electrode: It is allowed to use graphite electrode with current density lower than 17A/cm2, which is mainly used for ordinary power electric furnaces such as steel making, silicon refining, and yellowing phosphorus.
(2) Anti-oxidation coating graphite electrode: a graphite electrode coated with an anti-oxidation protective layer on the surface to form a protective layer which is both electrically conductive and resistant to high temperature oxidation, and reduces electrode consumption during steel making.
(3) High-power graphite electrode: A graphite electrode with a current density of 18 to 25 A/cm 2 is allowed, and is mainly used for a high-power electric arc furnace for steel making.
(4) Ultra High Power Graphite Electrode: A graphite electrode having a current density of more than 25 A/cm 2 is allowed. Mainly used in ultra high power steelmaking electric arc furnaces.
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