Patent ID: 7591976
Filing Date: 2009-09-22
Classification: B22D,C04B

Abstract:
1. An immersion nozzle for continuous casting aluminum killed molten iron, said nozzle having an inner passage through which the aluminum killed molten iron flows, a refractory material applied to said passage, said refractory material being prepared by adding a thermosetting resin binder to a mixture of synthetic dolomite clinker and magnesia clinker, and then kneading, pressure forming and subjecting the mixed material to thermal treatment, said synthetic dolomite clinker having an average particle size of 0.8 mm or less and a CaO content of 50 mass % or less, said mixed material having a ratio W1/W2 of 0.33 or more, wherein W1 is a content by mass of CaO, and W2 is a content by mass of MgO, and during casting, as the CaO in the dolomite is consumed by reaction with deposited alumina, MgO in the dolomite clinker forms an MgO-rich layer, improving corrosion resistance of the refractory material applied to the inner passage of the immersion nozzle.