Carbon raiser are divided into carburizers for steelmaking and carburizers for cast iron, and some other additives are also used, such as additives for brake pads, as friction materials. The recarburizer is an additional carburizing raw material for steelmaking and ironmaking. High-quality carburizer is an essential auxiliary additive for producing high-quality steel.
There are many kinds of raw materials for carbon additive, and the production processes are also different. It is not that graphite powder is used for compression molding on the market. This production method needs to add too much binder for molding, and the carbon content generally does not meet the requirements of high-quality recarburizers. The compressed graphite powder is in the form of a solid block without a porous structure, so the absorption speed and absorption rate are not as good as those of calcined and calcined recarburizers. High-quality recarburizers generally refer to graphitized recarburizers. Under high temperature conditions, the arrangement of carbon atoms is in the microscopic form of graphite, so it is called graphitization. Graphitization can reduce the content of impurities in the recarburizer, increase the carbon content of the recarburizer, and reduce the sulfur content.
The carbon raiser is used in casting, which can greatly increase the amount of scrap steel, reduce or eliminate the amount of pig iron. At present, most carburizers are suitable for electric furnace smelting, and a small number of carburizers with particularly fast absorption speed are used in cupolas. In the feeding method of electric furnace smelting, the recarburizer should be put in together with scrap steel and other furnace materials, and small doses can be added on the surface of molten iron. However, it is necessary to avoid feeding a large amount of materials into the molten iron to prevent excessive oxidation, resulting in insignificant carburization effects and insufficient carbon content in castings. The amount of carburant added is determined according to the ratio and carbon content of other raw materials. For different types of cast iron, choose different types of recarburizers according to your needs. The characteristics of the carburizer itself selects pure carbon-containing graphitized substances to reduce excessive impurities in pig iron, and the appropriate choice of carburizer can reduce the production cost of castings.