Industry News

- July 22, 2021

HP Graphite Electrode

The development of electric furnace steelmaking technology continuously puts forward new requirements on the variety and performance of graphite electrodes. The use of high-power and ultra-high-power electric furnaces for steelmaking can shorten the melting time of the charge, increase production efficiency, and reduce power consumption.

Reduce the consumption of graphite electrodes.

According to the transformer capacity per ton of furnace capacity, electric arc steelmaking furnaces can be divided into ordinary power furnaces, high power furnaces, and ultra-high power furnaces. According to the classification of the electric power level of electric furnace steelmaking, and according to the raw materials used in the production of electrodes

Different from the physical and chemical indicators of finished electrodes, graphite electrodes are divided into 3 types: ordinary power graphite electrodes (RP), high power graphite electrodes (HP) and ultra-high power graphite electrodes (UHP).

Ordinary power graphite electrodes are produced from ordinary petroleum coke, with low graphitization temperature, high resistivity, large linear expansion coefficient, and poor thermal shock resistance, so the allowable current density is low. High-power graphite electrode adopts high quality

In the production of petroleum coke, sometimes the electrode body needs to be impregnated, and its physical and mechanical properties are higher than that of ordinary power graphite electrodes, such as low resistivity, allowing a larger current density. And ultra-high power graphite electrodes must be used

High-grade needle coke is produced, and its graphitization heat treatment must be carried out in an in-line graphitization furnace. The graphitization temperature is as high as 2800-3000℃, so the resistivity is lower, allowing greater current density and linear expansion coefficient.

Smaller, with excellent thermal shock resistance.

The joint quality of high-power and ultra-high-power graphite electrodes is particularly important. The resistivity and linear expansion coefficient of the joint blank must be kept at a certain difference with the electrode body. The quality of the joint is better than the quality of the electrode body.