Method of bottom blowing operation of a steel making electric furnace

Abstract

In an electric furnace for producing ordinary steels, alloy and others by arc heat of electrodes incorporated with gas blowing from a furnace bottom into dissolving and refining, plugs having fine pipe holes as gas blowing means are positioned in space each other in the furnace bottom for blowing the gas from beginning of refining to tapping in amount of 1 to 40 N/min per one pipe hole, 20 to 800 N/min per one plug, and at pressure of less than 10 kg/cm.sup.2.g, so that the heats upheaves swell in height of less than 1000 mm, preferably 50<.DELTA.h<500 mm. The gas is blown in a melting period to splash up the molten metal toward solid raw scraps. Further, a part of the molten steel produced by a previous charge is stayed in the furnace bottom, and the gas is blown from a charging period of scraps, and the melting time is shortened.