Jfe Steel Corporation

Keisuke Mizobata

Masamichi Kikuchi

Tomoyoshi Ogasahara

Tomoharu Ishida

Yoshie Nakai

Shuji Kuyama

Hidemitsu Negishi

Akifumi Harada

Rei Yamada

A decarburization end point determination method includes: estimating the carbon concentration and oxygen concentration of the molten steel and carbon dioxide gas concentration of exhaust gas in the vacuum chamber by using measurement values of the carbon concentration and the oxygen concentration of the molten steel, a measurement value of internal pressure of the vacuum chamber, and a model formula; correcting a parameter included in the model formula to reduce at least one of a difference between an estimate value and a measurement value of the oxygen concentration and a difference between an estimate value and a measurement value of the carbon dioxide gas concentration of the exhaust gas; estimating the carbon concentration of the molten steel by using the model formula in which the parameter is corrected; and determining timing when an estimate value reaches a target value as the completion time point of the vacuum decarburization treatment.

Decarburization end point determination method, decarburization end point determination device, secondary refining operation method for steel making, and method for producing molten steel

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Tokyo, Japan

Keisuke Mizobata