Through the water cooling upward blowing coming lance which is interposed in degassing inside the tank with the oxygen content gas upward blowing coming device with

摘要

PROBLEM TO BE SOLVED: To provide an oxygen-containing gas blower in an RH degasser, where manganese loss during decarbonization or temperature raising by oxygen blow refinement in an RH degasser is lowered, an increase in the manganese oxide concentration of slag is reduced, and alloy cost reduction is realized because of the use of a large amount of high-carbon ferromanganese and to provide a refinement method using the same.;SOLUTION: Onto the inside surface of a nozzle 8 installed in a water-cooled lance 7 so as to blow an oxygen-containing gas toward the molten steel in a degassing tank, the gas is blown in the direction crossing the direction in which the oxygen-containing gas is blown from the nozzle 8. By providing one or more gas blow ports 13, the direction in which the oxygen-containing gas is blown from the nozzle 8 is made displaceable from the center on the degassing tank bottom between two recirculation pipes to the direction of the recirculation pipes.;COPYRIGHT: (C)2004,JPO