Development of mathematical model for predicting transformation of high-carbon steel during cooling on runout table and its application to on-line temperature control of hot strip mill

A mathematical model for predicting the progress of transformation in high-carbon steel during cooling was developed to improve temperature control accuracy during cooling on the runout table of the hot strip mill. This model was coupled with a temperature computing model that takes the heat of transformation into account, enabling the accurate calculation of strip temperature change on the runout table. The model was also introduced into the strip water cooling control system of the runout table on an actual hot strip mill, markedly improving the water cooling control of high-carbon steel and fully automating strip water cooling on the runout table.