Influencing factors of absorptivity of graphite particle carburizer

1, the time of adding carburizer

If the time of adding carburizing agent is too early, it is easy to make it attached near the bottom of the furnace, and attached to the wall of the carburizing agent is not easy to be melted into liquid iron. On the contrary, if the addition time is too late, the carburization time is lost, resulting in the slow melting 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, carburizing agent or in the process of adding metal charge to add bit by bit as well.

Such as in the case of a large amount of addition, can be combined with the induction furnace when the use of liquid iron overheating operation combined with consideration, to ensure that the absorption time of carburizer in liquid iron 10Min, on the one hand, through electromagnetic stirring to make carburizer full diffusion absorption, to ensure the absorption effect. On the other hand, it can reduce the amount of nitrogen brought into the carburizer.

2. Feeding mode of electric furnace smelting:

The carburizer should be put in with scrap and other charges, and a small dose can be added to the surface of hot iron. However, it is necessary to avoid large quantities of feeding into the molten iron to prevent excessive oxidation and carburization effect is not obvious and the carbon content of the casting is not enough. The addition of carburizing agent, according to the ratio of other raw materials and carbon content to determine.

3. Furnace input method:

Carburizing agent is suitable for melting in induction furnace, but the specific use is not the same according to the process requirements.

(1)) the use of carburizing agent in the medium frequency electric furnace melting, according to the ratio or carbon equivalent requirements with the material into the lower part of the electric furnace, the recovery rate can reach more than 95%;

(2) if the lack of carbon adjustment, the first dozen net furnace slag, plus carburant, by raising the temperature of molten iron, or artificial electromagnetic stirring to dissolve carbon absorption, the recovery rate is around 90%, if the low-temperature carbonization process, the melt furnace charge only part of the molten iron liquid under the condition of low temperature, all recarburizer one-time in liquid iron, At the same time, it is pressed into the liquid iron with a solid charge to keep it from exposing the surface of the liquid iron. The carburization of molten iron by this method can reach more than 1.0%.