<P> In metalworking, rolling is a metal forming process in which metal stock is passed through one or more pairs of rolls to reduce the thickness and to make the thickness uniform . The concept is similar to the rolling of dough . Rolling is classified according to the temperature of the metal rolled . If the temperature of the metal is above its recrystallization temperature, then the process is known as hot rolling . If the temperature of the metal is below its recrystallization temperature, the process is known as cold rolling . In terms of usage, hot rolling processes more tonnage than any other manufacturing process, and cold rolling processes the most tonnage out of all cold working processes . Roll stands holding pairs of rolls are grouped together into rolling mills that can quickly process metal, typically steel, into products such as structural steel (I - beams, angle stock, channel stock, and so on), bar stock, and rails . Most steel mills have rolling mill divisions that convert the semi-finished casting products into finished products . </P> <P> There are many types of rolling processes, including ring rolling, roll bending, roll forming, profile rolling, and controlled rolling . </P>

Difference between hot rolling mill and cold rolling mill
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