Precautions for using petroleum coke carburizer

Precautions for using petroleum coke carburizer

1. Carburizer manufacturers remind you that the addition time of carburizer cannot be ignored. For petroleum coke carburizer, if the carburizer is added too early, it is very easy to adsorb on the bottom of the furnace, and the carburizer adhering to the furnace wall is not easy to melt into molten iron. For tar carburizer, on the contrary, if it is added too late, the opportunity to add carbon will be lost, resulting in slow smelting and heating time. This not only delays the time for chemical composition analysis and adjustment, but may also cause harm due to excessive temperature. Therefore, in the process of adding metal charges, it is better to add carburizer gradually.

For example, in the case of too large a one-time addition, it can be combined with the overheating operation of the molten iron used in the induction heating furnace to ensure that the absorption time of the carburizing agent in the molten iron is 10 minutes. On the one hand, the carburizing agent is fully diffused and absorbed through electromagnetic stirring to ensure the absorption effect. On the other hand, it can reduce the nitrogen content brought into the carburetor.

2. Improved adding method: do not add at once, add in batches, melt and add a part, put a part (about one bag) of molten iron into the bag, then return to the furnace, increase the carbonizer by 1-2 times, and then add slag and alloy.

Using carburizer in the casting process can greatly increase the amount of scrap steel and reduce the amount of pig iron. At present, most carburizing furnaces are suitable for electric furnace smelting, and there are a few carburizing furnaces with particularly fast absorption speed in cupolas. In the charging method of electric furnace smelting, carburizing agent should be put into the furnace together with scrap steel and other furnace materials. Small doses of additives can be added to the surface of molten iron. However, large-scale feeding of molten iron should be avoided to prevent excessive oxidation, resulting in unclear carburizing effect and insufficient carbon content in castings. The amount of carburizer added depends on the ratio of other raw materials to carbon content. For different types of cast iron, different types of carburizers are used according to needs. The characteristic of the carburizer itself is to use graphitized substances containing pure carbon to reduce excessive impurities in pig iron. Reasonable use of carburizing agent can reduce the production cost of castings.