METHOD FOR DESULFURIZING MOLTEN STEEL WITH LADLE- REFINING

METHOD FOR DESULFURIZING MOLTEN STEEL WITH LADLE- REFINING

PROBLEM TO BE SOLVED: To provide a method for desulfurizing molten steel with a ladle- refining at a low cost, with which the desulfurizing efficiency can be kept similar to the conventional method without using fluorite. SOLUTION: When the desulfurizing treatment is applied by tapping off the molte...

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Hauptverfasser: SUDA MAMORU, KAMO MOMOKI, TAKAHASHI DAISUKE
Format: Patent
Sprache:eng
Schlagworte:
CHEMISTRY
METALLURGY
METALLURGY OF IRON
PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL
TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
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creator SUDA MAMORU
KAMO MOMOKI
TAKAHASHI DAISUKE
description PROBLEM TO BE SOLVED: To provide a method for desulfurizing molten steel with a ladle- refining at a low cost, with which the desulfurizing efficiency can be kept similar to the conventional method without using fluorite. SOLUTION: When the desulfurizing treatment is applied by tapping off the molten steel into the ladle after refining in a converter and stirring the molten steel held in this ladle, slag produced in the desulfurize-refining is made to flow out into the ladle together with the molten steel at the above tapping-off time. Further, after charging a flux which has the components and the amount simultaneously satisfying the following ranges in the finish composition of the slag applying the desulfurizing treatment into this ladle, and beforehand mixes lime-base material and Al2 O3 source respectively having
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SOLUTION: When the desulfurizing treatment is applied by tapping off the molten steel into the ladle after refining in a converter and stirring the molten steel held in this ladle, slag produced in the desulfurize-refining is made to flow out into the ladle together with the molten steel at the above tapping-off time. Further, after charging a flux which has the components and the amount simultaneously satisfying the following ranges in the finish composition of the slag applying the desulfurizing treatment into this ladle, and beforehand mixes lime-base material and Al2 O3 source respectively having &lt;=10 mm grain diameter, the molten steel and slag are stirred. CaO+MgO=55-65 mass%, Al2 O3 + SiO2 =30-45 mass%. 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subjects CHEMISTRY
METALLURGY
METALLURGY OF IRON
PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL
TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
title METHOD FOR DESULFURIZING MOLTEN STEEL WITH LADLE- REFINING
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