| 摘要 |
PURPOSE:To prolong the life of the bottom of a refining vessel by blowing gaseous hydrocarbon through tuyeres respectively at the specific ratios with respect to the flow rate of blowing oxygen in the blowing period for decarburization of molten metal and the flow rate of blowing the total inert gas in a reduction treatment stage. CONSTITUTION:In the stage of refining stainless steel in a refining vessel having a tuyere like double pipes consisting of inside and outside pipes 2-8% gaseous hydrocarbon basing on the flow rate of the oxygen to be blown into the bath of molten metal is released through theo outside pipe of the tuyere into the bath of the molten metal in a blowing period for decarburization. The 0.5-5% gaseous hydrocarbon basing on the flow rate of blowing the total inert gas is released into the bath through the outside pipe of the tuyere in a reduction treatment state. Gaseous propane is used for the gaseous hydrocarbon. The erosion of the tuyere is thus reduced. |
