The development of carburizers has a history of several decades.

The development of carburizers has a history of several decades. From the most common carbon powder and coal based carburizers to the present high-quality graphitized carburizers and graphite electrode carburizers, it can be said that there have been earth shaking changes, not only from the production process, but also from the use effect has been greatly improved. From the initial low price to the present high price, all reflect the renewal of materials and the change of material quality.

The whole carburizer development market changes. Only from the use of carburizing agent technology, we must have a certain understanding. In fact, in the actual production and application, there are certain methods for the influence of carburizing agent on smelting and the use of the same chemical composition, which smelting process and the proportion of different ingredients are adopted. For example, to obtain good carburizing effect, carburizing technology is used in electric furnace, and high temperature smelting technology is used in cupola.
The effect of carburizing agent on smelting is mainly in three aspects

1. In the melting process, especially in the electric furnace smelting, the graphite nucleation can be increased by the technology of molten iron carburizing. The addition of SiC in cupola melting can increase the long-term Graphite Nucleus of molten iron and reduce the oxidation of molten iron.

2. Carburization is the best measure to prevent or reduce shrinkage tendency. Due to the effect of graphitization expansion in the solidification process of molten iron, good graphitization will reduce the shrinkage tendency of molten iron.

3. Under the condition of high carbon content, in order to obtain high strength gray cast iron castings, the process of using all scrap steel and carburizing agent is adopted in the melting process to make the molten iron more pure and the casting material properties are high. Clean materials without oil pollution should be used in smelting to avoid electric leakage or excessive scum.



In the past, the iron filings added by some factories during smelting contained oil stain, which was easy to cause carbon deposition. The carbon deposition is on the cold surface of the furnace lining, even in the insulation layer. Because the furnace lining has not been fully sintered and penetrated into the back of the furnace lining, CO reacts with CO → C + O2 ↑ to form C, which is deposited in the cold surface of furnace lining or the pores of heat insulation materials. When carbon deposition occurs, it will cause leakage of furnace body ground and spark of coil. It can be avoided by using pure material. In another plant, because the source of scrap steel purchased was confused, and even the surface was coated with paint, lime, coal and other materials, there was a lot of scum, which consumed a lot of manpower and material resources in the later stage of slag removal.

Therefore, in order to understand the role of carburizing agent, it is necessary to understand how to use the carburizer and how to do the application process of graphite carburizing agent to achieve better results.

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