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Another system, which improves the wear pattern and service time of the work rolls, is roll shifting— i. Academia - Classification of Steel. Rolling mills for lead seem to have existed by the late 17th century. These types of mills are commonly used to hot roll wide plates, most cold rolling applications, and to roll foils. Another rolling system goes even farther and uses one four-high reversing rougher and one four-high reversing finishing mill, with hot-coiling boxes in front and in back of the finishing mill. It is also used to break up the spangles in galvanized steel. Reduction is high in the first stands e.
Steel - Hot strip | Britannica
Maintaining a uniform gap between the rolls is difficult because the rolls deflect under the load required to deform the workpiece. You can help by adding to it. This can be overcome by using a crowned roller parabolic crown , however the crowned roller will only compensate for one set of conditions, specifically the material, temperature, and amount of deformation. There are, however, hot-strip mills designed for smaller production. Methods of scarfing have included hand-chipping with chisels 18th and 19th centuries ; powered chipping and grinding with air chisels and grinders; burning with an oxy-fuel torch, whose gas pressure blows away the metal or slag melted by the flame;  and laser scarfing.
Description: As the rolling occurs the wall thickness decreases as the diameter increases. Because of the smaller size of the workpieces and their greater strength, as compared to hot rolled stock, four-high or cluster mills are used. Roll shifting permits so-called schedule-free rolling— i. It is also used to break up the spangles in galvanized steel. Other methods of compensating for roll deformation include continual varying crown CVC , pair cross rolling, and work roll bending.