The Consumption Mechanism Of Graphite Electrodes

1. End consumption

Includes the sublimation of the graphite material caused by the high temperature of the arc and the loss of the chemical reaction between the electrode end and the molten steel and slag. It is also related to whether the electrode is inserted into the molten steel to increase carbon. The high temperature sublimation rate of the end is mainly determined by the current density through the electrode, and secondly is related to the diameter of the side of the electrode after oxidation.

2, side oxidation

The amount of oxidation on the side of the electrode is related to the unit oxidation rate and the exposed area. In general, the amount of oxidation on the side of the electrode accounts for about 50% of the total consumption of the electrode. In recent years, in order to increase the smelting speed of the electric furnace, the frequency of oxygen blowing operations has been increased, resulting in an increase in the oxidation loss of the electrode.

3. Stump loss

When the electrode is continuously used to the connection of the upper and lower electrodes, a small section of the electrode or the joint (ie the residue) will be separated due to the oxidation of the body and the penetration of the crack.

4, the electrode is broken

Includes broken electrode torso and broken joints. The fracture of the electrode is related to the quality and processing cooperation of the graphite electrode and the joint, and is also related to the steelmaking operation.

5, the surface peels off and blocks off

In the process of smelting, the result is that the electrode's own thermal shock resistance is poor due to the rapid cooling and heating.