Technical performance indicators of graphite electrodes
Graphite electrodes are widely used in metal smelting operations, such as electric arc furnaces, submerged arc furnaces, ladle furnaces, and so on. The main composition of graphite electrodes is petroleum coke, which is made of low-ash and high-quality needle coke. After calcining, batching, kneading, molding and roasting, according to the required specifications of the customers, the graphite electrodes are manufactured with formed, fired and machined. The technical performance indicators of graphite electrodes mainly include:
1. Resistance. The resistance of graphite electrodes is an important indicator. Its value is related to the resistance of the entire electric arc furnace network and the load distribution between the graphite electrodes. Generally, the lower the resistance of the graphite electrodes, the smaller the power consumption, and the better the current conduction and heat dissipation, which can greatly improve the service life of the graphite electrodes and reduce the loss of electrical equipment.
2. Electrical resistivity. Electric resistivity refers to the resistivity of graphite electrodes under certain conditions of AC frequency and voltage, which is an important basis to judge the quality of graphite electrodes and to select graphite electrodes. Generally, the lower the resistivity, the better the quality of the graphite electrodes and the better the electric conductivity and heat dissipation effect of the graphite electrodes.
3. Compressive strength. Compressive strength is an important indicator to measure the mechanical strength of graphite electrodes. The compressive strength of graphite electrodes increases when the particle size and density rise and the resistance to cracking increases. In addition, the electrical resistivity of graphite electrodes slightly decreases with the increase of compressive strength.
4. Bending strength. Bending strength is an important technical index for judging the mechanical properties of graphite electrodes, which is related to the physical properties such as particle size and particle structure of graphite electrodes. After a certain deformation, if the graphite electrodes become brittle and fail without recovering elasticity, the graphite electrodes will be damaged.
5. Ash content. The content of ash refers to the amount of impurities in graphite electrodes, which is one of the important indicators to judge the quality of graphite electrodes. High content of ash will reduce the electrical conductivity and thermal conductivity of graphite electrodes, so the ash content of graphite electrodes should be controlled as far as possible.
6. Graphite coefficient of thermal expansion. The coefficient of thermal expansion is an important parameter of graphite electrodes, which reflects the expansion and contraction of graphite electrodes in different operating temperature conditions. It can be used to predict the thermal stress generated by the graphite electrodes at a certain temperature and the risk of cracking of graphite electrodes, which can prevent the cracking of graphite electrodes caused by thermal stress.
In conclusion, the technical performance indicators of graphite electrodes which include resistance, electrical resistivity, compressive strength, bending strength, ash content, and graphite coefficient of thermal expansion are important indices for judging its usage performance and selecting suitable products. Therefore, customers should pay sufficient attention to the technical performance indicators of graphite electrodes when purchasing graphite electrodes.
