Method for predicting contamination range of molten steel when changing ladle

摘要

Predicting a degree of molten steel contamination during ladle exchange includes setting a casting quantity (Q) and a residual quantity (Qrm). Casting quantity (Q) is the molten steel amount transferred from a tundish to a mold when a first ladle operation ends. Residual quantity (Qrm) is the molten steel amount existing in the tundish when a second ladle starts. Casting amount (Qplug), a first contaminant concentration is calculated as a function of Qrm and a proportional coefficient. Casting amount (Qpeak), the amount a second contaminant concentration, is calculated as a function of Qrm and a second proportional coefficient. A preliminary degree of contamination is a linear function of Q, Qplug, and Qpeak. A second preliminary degree of contamination is an exponential function of Q, Qplug, and Qpeak. The smaller of the two preliminary degrees of contamination is selected to obtain a degree of contamination at the ladle operation end and a second degree of contamination at the second ladle operation start.