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.

The refining furnace is the key equipment of the refining technology outside the furnace. The refining furnace has the function of stirring the molten pool, which can adjust the composition and temperature of molten steel, and promote the reaction of inclusions and slag.