Reinforcement steel (a.k.a. rebars, deformed bars and reinforcing steel) is very commonly used as a tensioning device uaually in reinforced concrete and reinforced masonry structures holding the concrete in compression. It is usually made from carbon steel. As concrete is relatively  strong in  compression, yet weak in tension, reinforcement steel is cast into it to compensate for the tensile load...

Structural steel is formed with a specific shape or cross section and certain standards of chemical composition and mechanical properties. Structural steel shape, size, composition, strength, storage, etc., is regulated in most industrialized countries. They serve a vast number of purposes in the construction and manufacturing industries....