| 摘要 |
PURPOSE:To stably produce high clean steel by adding strong deoxidizer in molten slag on surface of molten steel just after refining, stirring the molten slag by gas to reduce FeO and MnO in the molten slag and then, stirring the molten steel by the gas, to float up and remove the deoxidation product. CONSTITUTION:The strong deoxidizer of Al, Al dross, etc., is added in the molten slag on the molten steel obtd. after desiliconizing, dephosphorizing, desulfurizing and decarbonizing by oxidizing refining to molten iron. Then, the lance for blowing gas is dipped at 0-500mm depth to the molten steel surface and the inert gas of Ar, CO2, N2, etc., in case of need, together with powdery CaO, is blown and the strong reducing agent on the molten slag are sufficiently stirred and reacted, to reduce FeO, MnO, etc., in the molten slag, and T, Fe in the molten slag is made to <=3%, to refine the molten steel. Successively, the lance is dipped at >=1,000mm depth from the molten steel surface and the inert gas is blown and stirred to aggregate and float up the dispersed grain of Al2O3 in non-metallic inclusion as the deoxidation product and collect in the molten slag, and the high clean molten steel is produced.
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