Method for estimating phosphorus concentration in molten steel, converter blowing control device, program and recording medium

摘要

An object of the present invention is to accurately estimate the phosphorus concentration in molten steel during decarburization treatment. The method for estimating the phosphorus concentration in molten steel according to the present invention is a method in which dephosphorization is not performed before decarburization using a converter, or the dephosphorization is performed using equipment different from the converter used in the decarburization. In order to estimate the phosphorus concentration in molten steel during decarburization when phosphorus treatment is performed, the exhaust gas data acquisition step for acquiring exhaust gas components and exhaust gas flow rate, the molten steel temperature and the carbon concentration in the molten steel by sublance measurement The data acquisition step for the molten steel, the data on the decarbonation efficiency obtained using the exhaust gas component and the exhaust gas flow rate, the data on the exhaust gas component, the exhaust gas flow rate, the molten steel temperature and the carbon concentration, and the operation related to the decarburization treatment Calculate the dephosphorization rate constant using the conditions, and use the calculated dephosphorization rate constant and the phosphorus concentration in the molten steel at the start of the decarburization process. Kicking; and a phosphorus concentration estimation step to phosphorus estimating the concentration in the molten steel. [Selection] Figure 4