Abstract: carbon additive, as its name implies, is used to increase the carbon content of iron melting or steelmaking. If it is formed by graphite powder, which can greatly increase the amount of scrap steel, reduce pig iron or do not use pig iron. Carbon additive can reduce casting cost to a certain extent.

The classification of carbon additive for casting can be divided into several different categories according to different classification criteria and standards.

1. According to casting purpose, it is divided into: nodular iron carbon additive, gray iron carbon additive, cast steel carbon additive, special carbon additive:

1.1 ball iron carburizing agent generally uses graphitized high carbon and low sulfur products, the basic requirements are: C>98.5, S<0.05; its main material is graphite fossil oil coke, graphite electrode and so on. It also has the highest absorption rate and fastest absorption time in carburizing agents.

1.2 the main technical index of gray iron carburizing agent and nodular iron carburizing agent is the control of sulfur. The general requirement is S<0.5, and C content can be selected according to the cost control requirements 98.5 95 93 90. The absorption rate of this kind of carburizing agent is about 85%. Its main material is non graphite fossil oil coke, calcined coal and so on.

1.3 cast steel type of carburizing agent is more complex. In general, large steel mills choose a variety of carburizing agents according to different kinds of steel, but the general material is calcined coal, or Shi Moqiu, and it is also useful for natural graphite. The content varies from 75-99.

1.4 special carburizing agents are mainly used for brake block manufacturing, core wire manufacturing, and 0-0.5 or 0.5-1MM granularity.

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