Research on refining technology began in 1968. At that time, it was found that the reduction refining effect was remarkable by pre-forming the reduction slag in the electric arc furnace, mixing the steel slag, and blowing the ladle with argon, so the development of the ladle refining technology with the arc heating function was carried out.

Electric arc steelmaking furnace takes electric energy as the main energy. The electric energy generates high temperature above 2000 ~ 6000 ℃ through the discharge arc between graphite electrode and furnace charge, and melts the scrap raw material in the way of arc radiation, temperature convection and heat conduction. In most of the time when the charge melts, the high-temperature heat source is surrounded by the charge