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Summary of the role of recarburizers

2021-02-26 16:03:52

For different types of cast iron, different types of recarburizers can be selected according to needs. According to the characteristics of recarburizers, pure carbon-containing graphitized materials are selected to reduce excessive impurities in pig iron. The choice of recarburizers can reduce the production cost of castings. The raw materials and production processes of recarburizers are diverse, such as wood carbon, coal, coke, graphite, etc., among which there are many small types, and there are many classifications. Recarburizer generally refers to the recarburizer after graphitization. Under high temperature conditions, the arrangement of carbon atoms presents the microscopic morphology of graphite, so it is called graphitization.



Graphitization can reduce the impurity content in the recarburizer, increase the carbon content of the recarburizer, and reduce the sulfur content. The use of recarburizers in castings can greatly increase the amount of scrap, reduce the amount of pig iron or not use pig iron. The main materials used as recarburizers are graphite, graphite, electrode blocks, coke and so on.


In the electric furnace smelting feeding mode, the recarburizer should be put into the furnace together with the scrap steel and other ingredients. The addition of small dose 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 insignificant carburization 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. Used in castings, cast iron, cast steel, and casting will require carbon. As the name suggests, the recarburizer increases the carbon content in the molten iron. For example, it is often used to smelt pig iron, scrap, reheating material, and the iron carbon content is high, but it is relatively high in the purchase price of scrap steel. The higher part, so increase the supply of scrap steel, reduce the amount of pig iron, and increase the carbon agent, which can play a role in reducing the cost of castings.

The use of recarburizers can not only make up for the carbon loss in the steel smelting process, and ensure the specific carbon content grade requirements of the steel, but also can be used for post-furnace adjustment. Recarburizer is an important raw material for induction furnace molten iron, and its quality and usage directly affect the state of molten iron. The carbon content of the ladle can be adjusted by adding a special grade of recarburizer to the ladle after slagging and degassing, so as to achieve the purpose of multi-standard packaging. Common electrode blocks and recarburizers have the advantages of high carbon content and strong oxidation resistance, but the production process is complicated and the cost is high. Using coke powder and graphite as recarburization materials has lower production costs than electrode blocks and other materials, but the ash and sulfur content is high, the carbon content is low, and the recarburization effect is not good.


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