The effect of recarburizer on smelting
The same chemical composition uses different melting processes, different compositions and ratios, and the metallurgical quality of the molten iron is completely different, and good carburizing effects are obtained. The electric furnace adopts carbon enhancement technology. The anthracite recarburizer has three main effects on melting.
1. Hot metal carbonization technology can increase graphite nuclei in the smelting process, especially in the electric furnace smelting process. Adding a cupola to the iron carbide smelting process can increase the long-term nucleation of the graphite solution and reduce the oxidation of the molten iron.
2. Increasing carbon emissions is the best measure to prevent or reduce the shrinking trend of enterprises. Due to the role of graphite in the solidification process of expanded molten iron, good graphitization tends to reduce the shrinkage of molten iron.
3. Under the condition of high carbon content, in order to obtain high-strength gray iron castings, the smelting process can use all scrap steel and carburizing agent technology to make the molten iron simpler and purer and the casting structure material has high performance.
During the smelting process, oil-free cleaning materials should be used to avoid leakage or excessive scum. Forehearth oil from scrap iron plants is used to generate sparks and coils. It is believed that the iron is too high and the lining material leaks. In fact, This is mainly because the smelting iron filings contain a lot of oil, which is easy to cause carbon deposition. Even if an insulating layer is deposited on the cold carbon deposition part of the furnace lining, since the furnace lining has not been completely sintered, when carbon deposition occurs, it will also cause leakage and affect The lining is grounded system and causes coil sparks. It is generally believed that the higher the molten iron temperature, the longer the reaction time and the higher the carbon absorption rate.
However, the actual situation can be reversed. In the induction furnace, low-temperature carbonization and high-temperature silicon content increase, that is, at high temperatures, not only will not increase the carbon content, but reduce the carbon content, the equilibrium working temperature of ductile iron is 1450℃±20 ℃, the cost of gray cast iron is about 1400℃±20℃. The oxidation of carbon in the molten iron above the equilibrium temperature becomes intense. Due to the reaction in the molten iron, carbon oxides are continuously burned, and silicon is reduced and burned. At this time, a carburizing agent can be added to the surface of the molten iron to achieve a balance between increasing carbon and reducing carbon in the molten iron.