Abstract: Refractory casting nozzle for a changing device arranged at the outlet of a metallurgical vessel is provided with a top side refractory plate, which is provided with an abutting surface at each of two opposing end faces. During a change, the casting nozzle can either be moved against the one abutting surface of a top side plate of an adjacent casting nozzle or be pushed out from this casting nozzle. This top side plate is provided, in the one abutting surface, with a centering element protruding on both sides of this and in the opposite abutting surface with a bevelling on both sides, designed such that, during a change, the casting nozzle cooperates, with its centering elements with the bevellings of the adjacent identically designed casting nozzle, thus bringing about a guiding of the two casting nozzles.

Abstract: A lance for top injection in metallurgical vessels is used essentially for the refining process of pig iron and steel production. The lance has at least one inner tube and a cover of refractory concrete. The external profile of the cover of refractory concrete is polygonal. Also described is a method for the production of said lance.

Abstract: A cooled lance for injection into metallurgical vessels, comprises an inner tube or pipe, with an inlet for gas at the upper part of the injection lance and outlets for the gas at the lower part, and at least one outer tube or pipe that forms a cooling jacket with the inner tube or pipe, wherein the inner tube or pipe is fixed at only one point at said at least one outer tube or pipe and the gas flow takes place only through the cooling jacket formed between the inner tube or pipe and the outer tube or pipe.