Characteristic effect of carburizing agent
The characteristics of carburizing agent are that pure carbon containing graphitization material is selected to reduce excessive impurities in pig iron, and proper selection of carburizing agent can reduce the production cost of castings. There are many kinds of raw materials and production processes of carburizing agent. It is not said in the market that graphite powder is pressed and formed. This production method needs to add too much binder to form, and the carbon content generally cannot meet the requirements of high-quality carburizing agent. The pressed graphite powder is a solid block without a porous structure, so the absorption rate and absorption rate are not as good as those of calcined and calcined carburizers.
The use of carburizing agent in casting can greatly increase the amount of scrap steel, reduce the amount of pig iron or not use pig iron. At present, most of the carburizers are suitable for electric furnace smelting, and a small number of carburizers with particularly fast absorption rate are used for cupola. The amount of carburizing agent shall be determined according to the proportion and carbon content of other raw materials. For different types of cast iron, different types of carburizing agents can be selected according to needs. It is necessary to avoid feeding molten iron in large quantities to prevent excessive oxidation, which leads to poor carburizing effect and insufficient carbon content of castings.
High quality carburizers generally refer to graphitized carburizers. 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 carburizing agent, increase the carbon content of the carburizing agent and reduce the sulfur content.