What Is The Role Of Recarburizer In Casting?

What is the role of recarburizer in casting?

The use of recarburizer in castings can greatly increase the amount of scrap, reduce the amount of pig iron or not use pig iron. In the electric furnace melting feeding way, recarburizer should be put into the furnace together with scrap ingredients. Small doses can be added on the surface of molten iron. However, a large amount of molten iron should be avoided to avoid excessive oxidation, resulting in not obvious carburizing effect, and insufficient carbon content of the casting. The addition amount of recarburizer should be determined according to the proportion of other raw materials and carbon content. Different types of cast iron, according to the need to choose different types of recarburizer. According to the characteristics of recarburizer itself, the choice of pure carbon containing graphitized materials, reduce excessive impurities in pig iron, the choice of recarburizer can reduce the production cost of castings.

The addition time of recarburizer can not be ignored. If the time of adding the carburant is too early, it is easy to make it adhere to the bottom of the furnace near, and the carburant attached to the furnace wall is not easy to be melted into the molten iron. On the contrary, if the carbon is added too late, the opportunity to add carbon will be lost, resulting in slow melting and heating times. This not only delays the analysis and adjustment of the chemical composition, but also causes damage due to overheating. Therefore, recarburizer in the process of adding carbon or add a little metal charge as well.