The rolling mill is a device that implements the metal rolling process. It refers to the equipment that completes the whole process of rolling material production, including main equipment, auxiliary equipment, lifting transportation equipment and auxiliary equipment. However, the rolling mills are often referred to only the main equipment. The working frame is composed of rolls, roll bearings, rolling mill guides, arches, rail seats, roll adjusting devices, upper roll balancing devices and roll changing devices.

Rolling mill is mainly used in steel factory which produce deformed bar, wire rod, channel steel , flat bar,steel plate or other products.Deformed bar hot rolling line is divided into continuous rolling and semi-continuous rolling.