The use of carburizing agent in casting is the mainstream method. Because most of the carburizing agent is suitable for electric furnace, electric furnace feeding way is generally scrap steel and other raw materials together with carburizing agent.

A small amount of carburizing agent can be added to the surface of molten iron. But to avoid a large amount of hot metal feeding, so as to avoid excessive oxidation caused by carburizing effect is not obvious, casting carbon content is insufficient.

　　Of course, a small amount of cast steel carburizer can also be added to the surface of molten iron. In order to prevent excessive oxidation, the elastic effect is not obvious, the casting content is insufficient, it should be prohibited to feed a large amount of hot iron.

The amount of carburizing agent added in steelmaking should be determined according to the proportion and carbon content of other raw materials. According to the different requirements of different cast iron, choose the appropriate carburizing agent. Carbonizer itself is characterized by the selection of pure graphitized materials containing carbon, in order to reduce excessive impurities in pig iron, the choice of appropriate carburizing agent can reduce the production cost of castings.