There are many types of recarburizers, and there are also many materials that can be used as cast iron recarburizers, but the quality and price vary greatly. On the premise of ensuring the quality of castings, the casting aids should be correctly selected according to the characteristics and quality requirements of the company's products.
The use of recarburizers in castings can greatly increase the amount of scrap, reduce the amount of pig iron or eliminate the need for pig iron. In the feeding method of electric furnace smelting, the recarburizer should be fed into the furnace together with the scrap steel and other ingredients. A small amount can be added to the surface of the molten iron. However, a large amount of molten iron should be avoided to avoid excessive oxidation, resulting in insignificant carburizing effect and insufficient carbon content in castings. The amount of recarburizer added should be determined according to the ratio of other raw materials to the carbon content. For different types of cast iron, choose different types of recarburizers according to your needs. According to the characteristics of the recarburizer itself, the pure graphitized material containing carbon is selected to reduce the excessive impurities in the pig iron, and the choice of the recarburizer can reduce the production cost of the casting.
The addition time of the recarburizer cannot be ignored. If it is added too early, it will easily adhere to the bottom of the furnace, and the carburizing agent adhered to the furnace wall will not easily melt into molten iron. Conversely, if the time for adding carbon is too late, the opportunity to add carbon will be lost, resulting in slower melting and heating time. This will not only delay the time of chemical composition analysis and adjustment, but also cause damage due to overheating. Therefore, in the carburizing process, it is best to add a small amount of metal filler to the carburizing agent.
In the case of a large increase in the recarburizer for casting, use it in the induction furnace in combination with the hot metal overheating operation to ensure that the recarburizer is absorbed in the molten iron for 10 minutes. On the one hand, the recarburizer is fully diffused and absorbed by electromagnetic stirring to ensure the absorption effect. On the other hand, the nitrogen content in the recarburizer can be reduced. For more information on recarburizers, please pay attention to Shengchi Ferroalloy official website: http://www.scferroalloy.com/