The furnaces that use recarburizers include electric furnaces, cupolas, electric arc furnaces, intermediate frequency induction furnaces, etc., so that the amount of scrap steel can be greatly increased, and the amount of pig iron can be reduced or no pig iron is used.
The recarburizer is indeed of great help for the production of castings. For all cast irons (gray cast iron, ductile iron, vermicular graphite iron, gray cast iron, white cast iron, etc.), the graphite in the graphite recarburizer can be used as a pro-eutectic Nuclei of graphite and eutectic graphite. Different castings require different types of recarburizers. From the perspective of cost, choosing a suitable recarburizer is of great help to the quality of castings and economic benefits. In addition, studies have shown that with different proportions of carbonaceous recarburizers and no carburizing process, under the condition of the same final chemical composition of the molten iron, the nitrogen content in the carburized cast iron increases, and the nitrogen formed by nitrogen increases. Boronide, etc., can be used as the substrate of the graphite crystalline core, creating good nucleation and growth conditions for graphite. Thereby improving the quality of castings.
Under normal circumstances, the recarburizer is put into the furnace together with the scrap steel and other charges. The addition of small doses can be added on the surface of the molten iron, or it can be added quantitatively in batches. (Note: Avoid feeding large quantities of molten iron to prevent excessive oxidation, resulting in insignificant carburization effect and serious damage to castings.)
When using recarburizers in casting, it should be noted that the amount of recarburizer added is selected according to the size of different furnaces and the temperature of the furnace. For different types of cast iron, different types of recarburizers should be selected according to needs. The content of recarburizer on the market is more distributed from 75-98.5. With the market requirements for product quality, the recarburizer market is also fluctuating, especially the selection of graphitized recarburizers has made an important step forward. Therefore, casting selection of recarburizers is also a very good knowledge.
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Post time: Nov-05-2022