The characteristics of the recarburizer itself is to select pure carbon-containing graphitized substances to reduce excessive impurities in the pig iron. The appropriate selection of the recarburizer can reduce the production cost of castings.
There are many kinds of raw materials for recarburizers, and the production processes are also different. It is not said that graphite powder is used for compression molding. This production method requires the addition of too much binder for molding, and the carbon content generally does not meet the requirements of high-quality recarburizers. The compressed graphite powder, because it is a solid block, has no porous structure, so the absorption speed and absorption rate are not as good as calcined and roasted recarburizers.
The recarburizer is used in casting, which can greatly increase the amount of scrap steel, reduce the amount of pig iron or eliminate the need for pig iron.
At present, most of the recarburizers are suitable for electric furnace smelting, and a small part of the recarburizers with a particularly fast absorption rate are used in cupolas. The amount of recarburizer added is determined according to the ratio of other raw materials and the carbon content. For different types of cast iron, choose different types of recarburizers according to your needs. It is necessary to avoid large batches of materials in the molten iron to prevent excessive oxidation and the occurrence of insignificant recarburization effects and insufficient carbon content of the castings.
High-quality recarburizer generally refers to a recarburizer that has undergone graphitization.
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.