The method of adding calcined coke is that when producing pig iron, the amount of recarburizer is very large. It can be added in the early or mid-stage of the electric furnace smelting and feeding, and it is added in addition to scrap, and silicon carbide is added in conjunction with each other. Among them, the amount of addition involved in the middle and late stages of smelting has the preparatory treatment to enhance the leading role of high-purity graphite. At this time, a recarburizer with low nitrogen content must be added. The addition amount does not need to be too much, not exceeding 0.2%, to prevent the high-purity graphite from becoming thick. To fill the recarburizer, the ideal molten iron temperature is around 1500 degrees. Add the clean liquid surface of the slag. After more than ten minutes, the temperature can be released. You don’t need to pay attention to the residual recarburizer that is not digested and absorbed by the liquid surface, because it is in Petroleum recarburizer can also have a creative effect during the impact stirring process of the molten iron from the furnace. Medium temperature asphalt
The high content of recarburizer is very easy to cause nitrogen pore defects when smelting gray iron. For ductile iron, nitrogen pore defects also occur, and the probability is lower than that of gray iron. It is estimated that the nodulizer contains rare earths, etc. The degassing element worked.
The composition of the recarburizer should be distinguished by the composition of the nitrogen content. Induction heating furnace is used to add more than 50-60% of the scrap steel, and the smelting produces pig iron. Therefore, the greater the amount of scrap added, the greater the nitrogen content of the molten iron. Because the harmful elements such as titanium, lead, and antimony in the molten pig iron are low, low-nitrogen recarburizers should be used. If the recarburizer has a high nitrogen content, it is very easy to cause nitrogen holes in the casting. Generally speaking, low-end recarburizers have relatively high nitrogen content.
Carbon powder improves thermal efficiency, reduces power consumption, reduces electrical level loss, and increases the application deadline of furnace materials. It establishes the necessary conditions for large electric furnaces to improve smelting quality, reduce costs, and increase productivity. It significantly improves economic benefits and reduces production workshops. Dust pollution and labor efficiency of workers. The application of nitrogen inerting technology to the mixing and crushing of mixed coal improves the safety of the system and avoids the explosion of pulverized coal. Mixed injection is the core technology to complete mixed injection. The higher the carbon content of the steel, the higher the strength and hardness of the steel, but in addition, the plastic deformation and ductility of the steel will also decrease. Stainless steel plates on the sales market can also be divided into high-carbon steel and low-carbon steel according to their carbon content.