Precautions for use of carburant

01 Carburant is used in casting

It can greatly increase the amount of scrap steel, reduce the amount of pig iron or no pig iron. At present, most carburants are suitable for electric furnace smelting, and a few carburants with particularly fast absorption speed are used in cupola. For the feeding mode of electric furnace smelting, the carburant shall be put into the furnace together with scrap and other furnace materials. Small doses can be added on the surface of molten iron. However, it is necessary to avoid feeding large quantities of molten iron to prevent excessive oxidation, resulting in unclear carburization effect and insufficient carbon content of castings. The addition amount of carburant shall be determined according to the ratio and carbon content of other raw materials. For different types of cast iron, different types of carburants shall be selected according to needs. The characteristics of carburant itself select pure carbon containing graphitized materials to reduce excessive impurities in pig iron. The proper selection of carburant can reduce the production cost of castings. 

02 In the smelting process

Due to improper batching or loading and excessive decarburization, sometimes the carbon content in steel or iron does not meet the expected requirements. At this time, carbon should be added to the steel or molten iron. The main materials commonly used for carburization are graphite fossil oil coke, low sulfur calcined coke, anthracite pulverized coal, carburized pig iron, electrode powder, petroleum coke powder, asphalt coke, charcoal powder and coke powder. The requirement for carburant is that the higher the fixed carbon content, the better, and the lower the content of harmful impurities such as ash, volatile and sulfur, the better, so as not to pollute the steel. The smelting of castings uses high-quality carburant after high-temperature baking of petroleum coke with few impurities, which is an important link in the carburizing process. The quality of carburant determines the quality of molten iron and whether good graphitization effect can be obtained. In short, the carburant plays an important role in reducing the shrinkage of molten iron.

03 During melting of all scrap in electric furnace

The carburant with graphitization treatment is preferred. The carburant with high-temperature graphitization treatment can change the original disordered arrangement of carbon atoms into flake arrangement, and flake graphite can become a good core of graphite nucleation, so as to promote graphitization. Therefore, we should choose the carburant after high temperature graphitization treatment. During high temperature graphitization treatment, sulfur is reduced by the escape of SO₂ gas. Therefore, the sulfur content of high-quality carburant is very low, w (s) is generally less than 0.05%, and better w (s) is even less than 0.03%. At the same time, it is also an indirect index to judge whether it has been graphitized at high temperature and whether the graphitization is good. If the selected carburant is not graphitized at high temperature, the nucleation ability of graphite will be greatly reduced and the graphitization ability will be weakened. Even if the same amount of carbon can be achieved, but the result is completely different, to read more carburant technical news，contact us.