The new process of carburizing agent smelting, whether cost or finished product performance, is better than the traditional large proportion of pig iron dosage, carburizing agent added to the metal smelting furnace, the use of high quality, excellent carburizing agent, can be the worst scrap steel smelting out of the best casting, therefore, the choice of carburizing agent is particularly important.

The first point should try to use high temperature graphitized carburizing agent, such as graphite electrode or graphitized oil coke. Due to good carburizing agent, high absorption rate, fast dissolution rate, is conducive to reducing energy consumption, can effectively increase the nucleation core of liquid iron, improve metallurgical quality.

　　The second point is to choose sulfur nitrogen and other impurities such as low carburizing agent. And high sulfur content of carburizer, nitrogen content is also high, nitrogen slot holes tend to be higher than molten iron, gray iron iron liquid nitrogen content balance concentration is higher, ductile iron liquid iron is easy to produce shrinkage defects in the thick wall part, and impurities casting slag tends to increase the trend.

The third point is to pay attention to the selection, after high temperature treatment of graphitization carburizer material quality is better, if not tested, you can use the feel, eye view, and can draw a good mark on the paper.