A large number of types of varietal rolling can be found in the building materials market, however, a steel hot -rolled circle has been most widely used, which is widely used in the construction sector, automobile industry, as well as cosmic. Often a steel circle is called a rod that can be called universal material widely used in different sectors. For example, a circle of 40x is often used in details, where increased strength is important, in the production of carburetor springs and needles. Metal rods are used in the production of automobile parts and components, during the construction of fences, to increase the bearing capacity of materials, as a reinforcement, etc.