Method for adding carburizing agent for casting

 Iron stirring liquid can promote the increase of carbon, so the medium frequency induction furnace stirring force is weak, the stirring force of the power frequency induction furnace is strong, the increase of carbon is relatively more difficult, so the medium frequency induction furnace increase the possibility that carbon can not keep up with the melting speed of metal charge.

Even if the power frequency induction furnace stirring force is strong, adding carbon operation can not be ignored.This is because, as can be seen from the induction furnace smelting schematic diagram, there is a separate stirred iron flow in the induction furnace, and there is a dead corner in the furnace wall near its boundary.Graphite blocks that stay on the furnace wall cannot be melted into molten iron without superheated heating and long-term hot metal insulation.Excessive heating and long-term heat preservation of molten iron will increase the degree of supercooling of molten iron and increase the tendency of cast iron bleaching.In addition, for a medium frequency induction furnace wall near the generation of strong induction current, if the masses between the drilling molten iron graphite attached to the furnace wall, during the melting metal drilling second furnace smelting, resulting in soil erosion and damage to the furnace wall.Therefore, when the ratio of scrap is high and the amount of carburizing agent is large, more attention should be paid to adding carburizing agent.

The addition time of recarburizer can not be ignored.If the time of carburizing agent is too early, it is easy to make it adhere to the bottom of the furnace, attached to the furnace wall of carburizing agent is not easy to melt into molten iron.On the contrary, if the addition time is too late, the opportunity to add carbon will be lost, resulting in slow melting heating time.This not only delays the time of chemical composition analysis and adjustment, but also may cause harm due to overheating.So you have to add a little charge in the process of adding a carbon or a metal.