Numerical simulation of thermal field of work roll during top side-pouring twin-roll casting of steel

Abstract

During the top side-pouring twin-roll casting (TSTRC) of steel, the thermal field of the roll and the effects of parameters on the cooling power of roll surface were investigated using a two-dimensional model. The temperature and heat flux curves of roll surface appeared double-peak, especially when the rolling speed was high. The theories for the first and second peak of the curves and the relationship between the curve shape and the rolling speed were both discussed. Temperature variation curves in a revolution for different locations under the bottom roll surface were analyzed to reveal the temperature distribution of the roll. Besides, the cooling power of roll surface, measured by average temperature of roll surface, was of great significance in the TSTRC process. The influence of the rolling speed and the cooling water flux on the cooling power had been discussed and they were believed having positive and negative relativity with average temperature of roll surface, respectively. By comparison of average temperature range between two groups of simulation results, the cooling water flux was believed to affect the cooling power more than the rolling speed did. Furthermore, the increase of the cooling water flux was less effective in reducing the average temperature of roll surface especially when the water flux of the bottom roll was more than 6 m3/h. And to balance average surface temperature of two rolls, the suitable cooling water flux would be 4 m3/h and 6 m3/h for the upper and bottom roll respectively.