Patent ID: 8354354
Filing Date: 2013-01-15
Classification: B22D,C04B

Abstract:
1. A casting nozzle, comprising a nozzle structure including an inner hole portion that comes in contact with molten steel during use, said inner hole portion being constructed of a refractory aggregate which includes 20 mass % or more of CaO component, and 10 mass % or more of a clinker including CaO as a mineral phase, at least a portion of an outer surface of the CaO is developed on a particle surface of said clinker including CaO as mineral phase coated with a CaCO 3 film having 0.1 to 5 μm thickness which is provided only on the outer surface of the CaO particles that are exposed on an operative surface of the inner hole portion of the casting nozzle, wherein the CaCO 3 film is formed by cooling to under 300 to 850° C. in a CO 2 atmosphere after first being heated at a temperature above 850° C.