Rebar refers to steel for reinforced concrete and prestressed reinforced concrete. Its cross-section is circular, sometimes square with rounded corners. Including plain round steel bars, ribbed steel bars, and torsion steel bars.

Steel bars for reinforced concrete refer to straight or coiled steel bars used for reinforcing reinforced concrete. Their shapes are divided into two types: smooth round steel bars and deformed steel bars. The delivery state is straight bars and coiled bars.

Plain round steel bars are actually small round steel and discs of ordinary low carbon steel. Deformed steel bars are steel bars with ribbed surfaces, usually with two longitudinal ribs and transverse ribs evenly distributed along the length. There are three shapes of transverse ribs: spiral, herringbone, and crescent. Expressed in millimeters of nominal diameter. The nominal diameter of deformed steel bars is equivalent to the nominal diameter of plain round steel bars with equal cross-sections. The nominal diameter of steel bars is 8-50 mm, and the recommended diameters are 8, 12, 16, 20, 25, 32, and 40 mm. Steel types: 20MnSi, 20MnV, 25MnSi, BS20MnSi. Steel bars in concrete mainly bear tensile stress. Due to the role of ribs, deformed steel bars have greater bonding ability with concrete, so they can better withstand external forces. Steel bars are widely used in various building structures. Especially large, heavy, lightweight thin-walled and high-rise building structures.