IMPROVEMENT METHOD FOR RH DECARBURIZING EFFICIENCY ON MANUFACTURING OF ULTRALOW CARBON STEEL

摘要

The present invention relates to an improvement method for RH decarburizing efficiencies by increasing an oxygen concentration in a converter refined molten steel upon manufacturing of ultra low-carbon steels, and provides an improvement method for RH decarburizing efficiencies upon manufacturing of ultra low-carbon steels, comprising; a step of tapping a converter refined molten steel into a ladle upon manufacturing of ultra low-carbon steels; and a step of controlling a basicity of a slag teemed into the ladle within a preset range by feeding quicklime into the ladle upon the converter tapping; and a step of temperature measurement, acidity measurement and sampling by transferring the ladle with a controlled basicity in the above process to a BS(Bubbling stand) ; and a step of feeding a slag oxidizer capable of increasing an iron oxide composition in the slag into the ladle with temperature measurement, acidity measurement and sampling in the above process: and a step of transferring a molten steel with an increased o. [Reference numerals] (AA) START; (BB) END; (S10) Tapping a converter refined molten steel into a ladle; (S20) Controlling a basicity of a slag in a ladle by feeding quicklime into the ladle; (S30) Temperature measurement, acidity measurement, sampling of the ladle with a controllrf slag basicity; (S40) Feeding a slag oxidizer in the ladle after temperature measurement,acidity measurement, sampling; (S50) Transferring to RH degassing of a molten steel with an increased oxygen concentration due to feeding of a slag oxidizer