Patent ID: 7028868
Filing Date: 2006-04-18
Classification: B22D

Abstract:
1. A refractory nozzle for arrangement in or on a wall of a metallurgical crucible, particularly for steel melts, the nozzle comprising a discharge duct surrounding a flow passage, the discharge duct having a surface delimiting the flow passage and an outer housing ( 4 ), the discharge duct having an upper part ( 10 ) comprising a foam ceramic material and a lower part ( 6 ) with the lower part ( 6 ) being fixed on or in the upper part ( 10 ), wherein the flow passage is configured differently in the upper part and the lower part by at least one of the following: (a) the surface of the upper part ( 10 ) delimiting the flow passage ( 2 ) being made of a different material than the surface of the lower part ( 6 ) delimiting the flow passage ( 2 ) and (b) a diameter of the flow passage ( 2 ) in the upper part ( 10 ) being larger than a diameter of the flow passage ( 2 ) in the lower part ( 6 ).