Method Of Adding Recarburizer

The stirring of molten iron can promote recarburization. Therefore, compared with the power frequency induction furnace with strong stirring power, the medium frequency induction electric furnace with weak stirring power is more difficult to increase carbon. Therefore, the medium frequency induction electric furnace has carbon increase and cannot keep up with the melting rate of the metal charge. Possibility. Even for a power frequency induction furnace with strong stirring power, the recarburization operation cannot be ignored. This is because, from the principle diagram of the induction electric furnace smelting, it can be seen that there are agitating iron flows separated up and down in the induction electric furnace, and there are dead corners near the furnace wall at the boundary. The graphite clusters staying and adhering to the furnace wall cannot be melted into the molten iron without excessive heating and long-term heat preservation of the molten iron. Excessive temperature rise and long-term holding of molten iron will increase the degree of subcooling of molten iron and tend to increase the whitening of cast iron. In addition, for an intermediate frequency induction electric furnace that generates a strong induction current near the furnace wall, if molten iron is drilled between the graphite masses attached to the furnace wall, the drilled metal will be melted during the next furnace smelting, resulting in corrosion And damage the furnace wall. Therefore, when the proportion of scrap steel is high and a lot of recarburizers are added, more attention should be paid to adding recarburizers. 

The adding time of the recarburizer cannot be ignored. If the recarburizer is added too early, it will easily adhere to the bottom of the furnace, and the recarburizer attached to the furnace wall will not be easily melted into the molten iron. On the contrary, if the addition time is too late, the opportunity for carbon increase will be lost, resulting in slow smelting and heating time. This not only delays the time for chemical composition analysis and adjustment, but also may cause harm due to excessive heating. Therefore, it is better to add the recarburizer little by little during the process of adding the metal charge.