| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for smelting molten stainless steel, which reduces Al concentration in the molten stainless steel, accelerates desulfurization, facilitates smelting the molten stainless steel into an extreme low Al and low S content, reduces Cr2 O3 concentration in slag, and enables resource recovery of the generated slag. SOLUTION: The method for smelting the molten stainless steel, which smelts a crude molten steel through primary decarbonization, by blowing oxygen into a molten pig iron and a ferrochrome alloy charged in a converter type vessel 10, taps the crude molten steel out into a ladle 21, refines the crude molten steel through the secondary decarbonization and deoxidation treatment with the use of a secondary refining furnace 30, is characterized by reducing the slag through adding a silicon-containing alloy to the slag, which is generated after the primary decarbonization refinement by oxygen-blowing, then adding Al so that Al concentration in the crude molten steel may become 0.05-0.2 wt.%, desulfurizing it, tapping it out into the ladle 21, and adding no Al during heating up and deoxidation treatment in sequential secondary decarbonization refinement with the use of the secondary refining furnace 30.
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