1. The consumption of graphite electrode in eAF steelmaking is mainly related to the quality management of working electrode materials and furnace conditions, such as whether there is mechanical equipment failure in the old and new furnaces and whether continuous production can be carried out.Steel making operations, such as: steel making, oxygen blowing time, loading conditions, and the consumption of graphite electrode itself, its consumption mechanism has the following aspects:
1、The final target consumption is mainly the sublimation of graphite material caused by high temperature of arc, and the loss of chemical reaction between electrocritical parts and molten steel and slag.The final temperature through the sublimation rate depends on the current density of the electrode and the diameter of the back of the oxidation electrode.
2、The side electrode is made of carbon, which reacts with ambient air, water vapor and carbon dioxide under certain economic conditions.The amount of oxidation on the electrode side is related to unit oxidation rate and exposed area.Normally, the oxidation electrode side should be about 50% of the total electrode consumption.In recent years, in order to improve the smelting speed of electric furnace, the number of oxygen blowing operation is increased, resulting in the loss of oxidation technology of working electrode.Redness and taper of the lower electrode bundle are often observed during steelmaking.
3.Joint loss When the electrodes are continuously connected to the upper and lower electrodes of the enterprise, some of the primary electrode or the joint (i.e. the residue) will fracture due to the oxidation thinning of the working electrode or crack penetration.The residual loss is related to the shape of the joint, the internal structure of the electrode, and the vibration and shock of the electrode column.
4.The thermal shock resistance of the electrode itself is poor during the melting process of surface peeling.
5.Electrode fracture includes main electrode fracture and joint fracture.The fracture of electrode is related to the quality of graphite electrode and joint, processing technology and steelmaking operation.