650mm graphite electrode
The consumption mechanism of 650mm graphite electrode
The consumption of 650mm graphite electrode in electric furnace steelmaking is mainly related to the quality of the electrode itself, but also to the condition of the steelmaking furnace (such as new and old furnaces, whether there are mechanical failures, whether continuous production, etc.) and steelmaking operations (such as smelting steel types, Oxygen blowing time, charge conditions, etc.) are very important. Here we only discuss the consumption of the 650 graphite electrode itself. Its consumption mechanism has the following aspects:
1. End consumption includes the loss of graphite material sublimation caused by arc high temperature and the chemical reaction of electrode end with molten steel and slag. The high-temperature sublimation rate of the end mainly depends on the current density through the electrode, and secondly is related to the diameter of the side of the electrode after oxidation, and the end consumption is also related to whether the electrode is inserted into the molten steel to increase carbon.
2. Side oxidation The chemical composition of the electrode is carbon. Under certain conditions, carbon will oxidize with air, water vapor, and carbon dioxide. The amount of oxidation on the side of the electrode is related to the unit oxidation rate and exposed area. In general, the amount of oxidation on the side of the electrode accounts for about 50% of the total electrode consumption. 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. Frequent observation of the redness of the electrode trunk and the taper of the lower end during the steelmaking process is an intuitive way to measure the electrode’s oxidation resistance.
3. Loss of stump When the electrode is continuously used to the connection between the upper and lower electrodes, a small section of the electrode or joint (that is, the residual body) is detached due to the oxidation of the body and the penetration of the crack. The size of the stub loss is related to the shape of the joint, the internal structure of the electrode, the vibration and impact of the electrode column.
4. The surface is peeled off and lumps fall off. It is the result of rapid cooling and heating during the smelting process, and the poor thermal vibration resistance of the electrode itself.
5. Electrode breakage, including electrode trunk breakage and joint breakage. The electrode breakage is related to the quality and processing cooperation of the 650mm graphite electrode and the joint, as well as the steelmaking operation. The cause is often the focus of disputes between the steel mill and the electrode manufacturer.