What is hot rolling?

Hot rolling of rebar is actually a method in which thick steel ingots or sheets are turned into thinner sheets. This is done by using two rotating rollers that move in opposite directions. The reason for its name is that in this process, the metal must be heated enough so that after passing through the rollers, it slowly thins and its cross section changes. Currently, hot rolling is most widely used in the production of steel sections.

This method was first used in the 17th century in European countries. At that time, they used to turn the rollers with the help of pack horses. Later, they increased the number of rollers and reduced their dimensions to make them easier to rotate. But with the introduction of steam machines into the world of industry, the rolling method also underwent a change, and the craftsmen were able to use larger rollers to thin steel and other metal sheets. Since then, this process has experienced many improvements. We now know that in order to perform this process in the best way, the temperature of the ingot or metal in question must be uniform. The non-uniformity of temperature along the length of the metal causes its surface to crack and break after rolling. Also, in order to increase the quality of the plates or plates produced, during the hot rolling process, the temperature of the metal should be higher than its recrystallization temperature. Usually, craftsmen consider this temperature between 50 and 100 degrees higher than the mentioned temperature. The rollers used in the hot rolling production line have a diameter between 60 and 140 cm, and their weight and material also depends on the type of metal used.