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There are many types of carburizers, which can be roughly divided into four categories based on the differences in raw materials and index content components.: Petroleum coke carburizer, graphite carburizer, coal carburizer and rocky desert petroleum coke carburizer. The raw materials of these types of carburizing agents are different, so the data of fixed carbon, sulfur, ash and volatile matter of the produced carburizing agents are also different, and the final absorption rate effect achieved after use is also different. Therefore, you must pay attention to many issues when choosing to purchase carburizing agents. In particular, the role of carburizing agents in gray cast and ductile iron is also different, and it also has a great influence on the production of castings. You must not buy carburizing agents casually, but the best one is the one that is suitable. What issues should be paid attention to when adding and using carburizers?: Note 1. The adding time of the carburizing agent cannot be ignored. If the adding time of the carburizing agent is too early, it will easily adhere to the bottom of the furnace, and the carburizing agent attached to the furnace wall will not be easily dissolved into the iron. On the contrary, if the adding time is too late, the opportunity to add carburizing will be lost, resulting in slow melting and heating time. This not only prolongs the time for chemical composition analysis and adjustment, but may also cause harm to the ferrous alloy due to excessive heating. Therefore, adding the carburizing agent bit by bit during the process of adding metal charge will have a better effect. If the amount added at one time is too large, it can be considered in conjunction with the overheating operation of the molten iron used in the induction furnace to ensure that the absorption time of the carburizing agent in the molten iron is 10 minutes. On the one hand, electromagnetic stirring is used to fully diffuse and absorb the carburizing agent to ensure the absorption effect. On the other hand, it can reduce the nitrogen content brought into the carburizing agent. Note 2: Improve the adding method. Do not add it all at once, but add it in batches. Finally, after melting, add a part, put a part (about a bag) of molten iron into the bag, and then return to the furnace to add carburizing agent 1-2 times, then break the slag and add alloy. There are several aspects that need to be paid attention to:: 1. The carburizing agent is difficult to absorb (it has not been calcined) 2. The carburizing agent contains a lot of ash and the particles are unevenly distributed 3. The adding time is too late 4. The adding method is wrong, and it is added in layers. Avoid adding 5 when there is too much slag on the molten iron mirror surface. Try not to use too many rusty materials.