In metalworking, rolling is ametal forming process in which metal stock is passed through one or more pairsof rolls to reduce the thickness and to make the thickness uniform. Rolling isclassified according to the temperature of the metal rolled. When thetemperature of the metal is above its recrystallization temperature, then theprocess is known as hot rolling.This makes the steel easier to form, and alsoresults in products that are easier to work with.
Rolling of steel is one of themost important manufacturing processes for steel. It is usually the first stepin the processing of steel after it is made and cast either in Ingot orcontinuous cast product in a steel melting shop. Hot rolling is used mainly toproduce sheet metal or simple cross sections, such as rail tracks. Othertypical uses for hot rolled metal includes truck frames, automotive wheels,pipe and tubular, water heaters, agriculture equipment, strapping, stamping,compressor shells, rail car components, wheel rims, metal buildings, railroadhopper cars, doors, shelving, discs, guard rails, automotive clutch plates.