Graphite electrode is an important high-temperature conductive material for electric furnace steelmaking. Electric energy is input into the electric furnace through the graphite electrode, and the high temperature generated by the arc between the electrode end and the charge is used as a heat source to melt the charge for steelmaking. Specifications range from 300 to 800mm in diameter and 1.8m, 2.1m, 2.4m, and 2.7m in length.

The manufacturing process is to calcine petroleum coke at 1350°C. The resulting calcined coke is crushed, ground and screened to form the aggregate and powder required for molding. The needle coke and powder are processed using a special technical formula for molding. The calcined coke is mixed with different particle sizes, different proportions and a certain proportion of binder asphalt in the kneader according to a certain temperature and time.

After kneading, the carbon paste is sent to the material chamber of the molding press through the conveyor belt, and is applied by the molding equipment. Plastic deformation occurs under external force, eventually forming an electrode green body (or green product) with a certain shape, size, density and strength. The green product is put into a specially designed heating furnace for high-temperature heat treatment at 1300°C to carbonize the coal pitch in the green body to form a product with higher mechanical strength, lower resistivity, better thermal stability and chemical stability.

For carbon products, roasting is one of the main processes in the production of carbon products. The roasting production cycle is long (22-30 days for the first roasting, 5-20 days for the second roasting depending on the furnace type), and the energy consumption is high. After that, the carbon material is placed in a pressure vessel, and the liquid impregnating agent asphalt is immersed and penetrated into the electrode pores of the product under the conditions of 360-400°C and 1.5-1.8MPa pressure to increase the volume density and mechanical strength of the product, and improve the conductivity and conductivity of the product. Thermal conductivity.

After the roasted product is impregnated, it is roasted again to carbonize the pitch immersed in the pores of the roasted product. Then add a protective medium to the roasted product in a high-temperature electric furnace to heat the carbon product to above 2800°C, converting the amorphous turbostratic carbon into a three-dimensional ordered graphite crystal structure to improve the electrical conductivity, thermal conductivity, and heat resistance of the carbon material. Vibration performance and chemical stability make the carbon material lubricity and anti-wear, and discharge impurities to improve the purity of the carbon material. Finally, we rely on cutting processing to achieve the required size, shape, precision, etc., and make the electrode body that meets the usage requirements.
Because electrode joints require high body density and low resistance, the processing process requires three dips and four firings to meet the requirements.
Our company's products comply with YB/T4088-2015, YB/T4089-2015, YB/T4090-2015 standards. The graphite electrodes and joints produced have high volume density, high flexural strength, low resistivity, good thermal shock resistance, and It has strong oxidizing properties and is superior to national and industry standards. The product has passed the inspection of the National Graphite Product Quality Supervision and Inspection Center.