Graphitized petroleum coke (GPC)
Under high temperature conditions, the arrangement of carbon atoms is in the microscopic shape of graphite, so it is called graphitization. Graphitization can reduce the content of magazines in the recarburizer, increase the carbon content of the recarburizer, and reduce the sulfur content.
The use of recarburizers in casting can greatly increase the amount of scrap steel and reduce the amount of pig iron or do not use pig iron. Most of the recarburizers are suitable for electric furnace smelting, and a small number of recarburizers with particularly fast absorption are used in cupola furnaces. In the feeding method of electric furnace smelting, the recarburizer should be put in together with the charge such as scrap steel, and a small dose can be added on the surface of molten iron. However, it is necessary to avoid feeding molten iron in large quantities, so as to prevent excessive oxidation, resulting in insignificant carbon increase effect and insufficient carbon content in castings.
The amount of recarburizer added is determined according to the ratio of other raw materials and the carbon content. Different types of cast iron, choose different types of recarburizers according to your needs. The characteristics of recarburizer itself choose pure carbon-containing graphitized substances to reduce excessive impurities in pig iron. The proper selection of recarburizer can reduce the production cost of castings.