UHP Graphite Electrode 500mm x 2100mm for Electric Arc Furnace High Conductivity

500*2400 mm , 500*2100 mm Electric Arc Furnace Graphite Electrode

Introduction

The production of graphite electrodes begins with the high temperature blending of crushed and screened petroleum coke with coal or petroleum tar pitch. The mix is then charged into a extruding machine from which a cylindrical column of certain diameter is extruded and cooled. These “green electrode” then enter an oven to undergo a baking process. The heating process follows a predetermined and gradually increasing heating curve, reaching a final temperature of approximately 900 degrees centigrade. During this stage, the petroleum pitch is converted into hard coke, and impurities are removed. After the baking process, the electrode forms may be impregnated with a special pitch and rebaked, filling pores to increase density and strength, and lowering the electrical resistivity. The electrode forms are packed in electric furnace surrounded by carbon particles to form a solid mass for graphitization. An electric current is passed through the furnace, raising the temperature to approximately 3000 degrees centigrade.

The graphite electrodes, after cooling, may then go to a final stage to be machined to exact dimension and tolerance. This stage may also include machining and fitting the end of the electrode with a threaded graphite pin joining system (also known as nipple). Detail as following picture.

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