To analyze corrosion rate variations of blast furnace main trough numerically, the mass transfer model was applied hypothesizing that the corrosion rate increases with an increase in slag flow speed. Depending on the Fick’s law, the model took account of refractory solubility to slag, slag flow speed, diffusion coefficient of a refractory to slag, and slag viscosity. Applying the model to corrosion rate analysis of a commercially operated blast furnace trough, the overall diffusion coefficients were obtained as 3.03×10－10m2･s－1 for slag line and 1.15×10－9m2･s－1 for metal line. These values were agreed with laboratory measured values investigated in literatures by the digit. Moreover, the difference of the corrosion rate between impact zone (upper part) and lower part of a main trough was explained by slag flow speed variation quantitatively. In addition, influences of temperature and saturation degree of refractory to slag on corrosion rate were assessed by the model.

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