Abstract: An electric steel-making furnace with improved spray cooling features. Used spray coolant is disposed of, preferably after gravity removal from the furnace, by means of disc-type pumps, which can be operated continuously, even with a variable or discontinuous supply of exhaust coolant, at great savings compared to venturi-type pumps. Improved discharge outlet arrangements are provided to accommodate forward and rearward tilting movements of the furnace, as in the pouring off of slag and in the tapping of the molten steel product. These provisions may include a novel form of quick-disconnect fitting, to accommodate swinging away of the furnace roof for charging. Simple and efficient delta cooling means are also provided.