The casting and hot rolling process is a most important and widely used industrial route to produce aluminum alloy sheet[1]. Because rolling is such a high volume process and the capital expenditure in plants and fabrication facilities is so large, even small cost savings or increases in efficiency can result in a very large total money savings[2, 3]. To remove the very costly and time-consuming plant trials, numerical simulation and nondestructive monitoring of the hot rolling process is highly needed.