Numerical Simulation of Heat Transfer Between Roller and Slab During Medium Thickness Slab Continuous Casting

In the medium thickness slab continuous casting, the roller will bear higher temperature, which poses a severe challenge to the roller service life. It has significance to study the influence factors on the roller temperature distribution. A three-dimensional model for transient heat transfer between the rotating roller and the moving medium thickness slab at the straightening zone was established. The model considers the coupling process of several physical fields, such as conduction heat transfer, radiation heat transfer, turbulent flow of the cooling water inside the roller, convective heat transfer, and roller rotation. Temperature variation in the roller at the casting speed of 0.9, 1.0, and 1.1 m/min was simulated with the slab surface temperature of 1273, 1323, and 1373 K. Results showed that the maximum temperature on the circumferential roller surface increased with the increase of the slab temperature, but decreased with the increase of casting speed while the slab surface temperature remaining unchanged.