| 简介 |
PROBLEM TO BE SOLVED : To prevent the occurrence of clogging of a soaking nozzle, by reducing both a large-sized CaS system inclusion and a low melting point inclusion, and restraining generation of MnS by adding a rare-earth element and Ca, when continuously casting high carbon steel of the C concentration of 0.50% or more.
SOLUTION : When continuously casting high carbon molten steel deacidificated by using aluminum taken out of a converter with 0.5 mass% or more in the C concentration after desulfurization processing by using a plurality of desulfurization agents, the desulfurization processing-applied molten steel is continuously cast by adding metal Ca to the high carbon molten steel and desulfurizing them when the S concentration is 0.0030 mass% or less after adding a rare-earth element. CaS deposition in the molten steel is restrained though being high carbon steel, and cleanliness of steel is improved by restraining generation of low melting point oxide, and thereby clogging of a soaking nozzle can be prevented.
SELECTED DRAWING : None
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