A process for the manufacture of steel

摘要

836,342. Steel manufacture. GESELLSCHAFT DER L. VON ROLL'SCHEN EISENWERKE A.G. Aug. 6, 1958 [Aug. 20, 1957], No 25219/58. Class 72 A process for the manufacture of steel comprises charging an electric furnace with a charge containing at least 20% by weight of liquid pig-iron, covering the pig iron with a solid layer of scrap in which is embedded iron ore or oxides and slag forming materials at positions below the electrodes, melting the charge to form craters through the solid layer to the liquid pig iron, continuing the heating until the charge is completely melted, and then refining the melted charge. As shown, an electric furnace 1 is charged with scrap and has iron oxide or ore and slag forming materials 3 arranged below the electrodes 4, molten pig-iron in amount at least 20% of the charge is then added. On melting craters are rapidly formed below the electrodes. Part only of the ore and slag-formers may be added initially the remainder being added to the craters during melting. Reducing substances, e.g. carbon, aluminium, or mixtures thereof, may also be added,. particularly when the charge includes an. excess of ore.