The steel bar for reinforced concrete refers to the straight or coiled steel used for reinforcement of reinforced concrete. Its shape can be divided into two types: plain round steel bar and deformed steel bar, and the delivery state is straight bar and round bar.

In fact, the plain round steel bar is the small round steel and round plate of ordinary low carbon steel. Deformed steel bar is a kind of steel bar with rib on the surface, usually with two longitudinal ribs and transverse ribs evenly distributed along the length direction. The shape of transverse rib is spiral, herringbone and crescent. Expressed in mm of nominal diameter. The nominal diameter of deformed bars is equivalent to that of plain round bars with equal cross-sections. The nominal diameter of reinforcement is 8-50 mm, and the recommended diameter is 8, 12, 16, 20, 25, 32 and 40 mm. Steel grades: 20MnSi, 20mnv, 25mnsi, bs20mnsi. Steel bars mainly bear tensile stress in concrete. Due to the effect of ribs, deformed steel bars have greater bonding capacity with concrete, so they can better bear the action of external forces. Reinforcement is widely used in various building structures. In particular, large, heavy, light thin-walled and high-rise building structures.