METHOD FOR SMELTING HIGH ALUMINUM LOW SILICON ULTRAPURE FERRITIC STAINLESS STEEL

摘要

23A method for smelting high aluminum low silicon ultrapure ferritic stainless steel. First vacuum oxygen decarburization (VOD) and free decarburization treatment is performed on molten ferritic stainless steel in a VOD furnace then a reduction process of a VOD vacuum treatment process is improved and measures such as preliminary deoxidation final deoxidation vacuum breaking addition of high density aluminum iron control of the alkalinity of slag followed by wire feeding treatment and protected casting in a continuous casting process are taken so as to obtain high aluminum low silicon ultrapure ferritic stainless steel during the continuous casting treatment improve acid pickling performance of the ultrapure ferritic stainless steel further improve the purity of the molten steel and the castable performance in the continuous casting process meanwhile effectively suppress the formation of the harmful inclusion of the magnesia aluminum spinel effectively remove the inclusion of AlO suppress oxidation of titanium in titanium containing steel and avoid blockage of a tundish nozzle in the continuous casting process.