Does the fixed carbon content of graphitized carburizer affect the quality of molten iron directly?
Jul 24, 2024
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The use of carburizer in casting can greatly increase the amount of scrap steel, reduce the amount of pig iron or do not use pig iron. The feeding method of electric furnace melting should put the carburizer into the furnace with the scrap and other charging materials, and the addition of small doses can be added to the surface of the hot metal, but it is necessary to avoid large quantities of the hot metal to prevent excessive oxidation and the carburizing effect is not obvious and the carbon content of the casting is not enough. In addition to these problems, the quality of graphitization carburizer is also affected by other factors, and we will take a look at the specifics.
1, fixed carbon content: general graphitized carburizing agent fixed carbon content to reach more than 99%, fixed carbon content directly affects the quality of casting hot metal, plays an important role in the shrinkage of hot metal;
2, sulfur content: sulfur is a harmful element in the graphitization carburizer, the lower the sulfur content of the casting product is more favorable;
3, nitrogen content: nitrogen content has a direct impact on the metallographic structure and mechanical properties of the casting, nitrogen content is too high, will cause the casting to produce nitrogen pores;
4, ash content: too much ash content will increase the content of impurities in molten steel, which directly affects the quality of the product;
5, moisture content: graphitized carburizer in the water content is too high will make the casting porosity;
6, volatile content: volatile content is too high will increase the gas content in molten steel, increase the porosity.
In summary, among the many graphitized carburizer indicators, the indicators that affect the quality of the product are mainly fixed carbon content, sulfur, nitrogen, ash, volatile matter and water content. Different kinds of cast iron are required to choose different types of carburizer, and the carburizer itself should choose pure carbon-containing graphitized substances to reduce excessive impurities in the pig iron to reduce the cost of casting.
