Introduction to Steel Rebar
Introduction to Steel Rebar | |
| Rebar refers to steel for reinforced concrete and prestressed reinforced concrete. Its cross-section is circular, sometimes square with rounded corners. There are many types of steel bars, which are usually classified according to chemical composition, production process, rolling shape, supply form, diameter size, and use in structures: | |
| 1. Classification according to diameter size | |
| Steel Wire | Diameter 3-5mm |
| Thin Steel Rebars | Diameter 6-10mm |
| Thick Steel Rebars | Diameter greater than 22m |
| 2. Classification according to production technology | |
| hot rolled steel Rebars | Hot rolling process |
| Cold rolled steel Rebars | Cold rolling process |
| cold drawn steel Rebars | Cold Drawn process |
| Heat-treated steel Rebars | Heat-treated process,which are made from grade IV steel Rebars,higher strength. |
| 3. Classification according to rolling shape | |
| plain round steel bars （Smooth Reinforcing Bar） | Class I steel bars (Q300 steel bars) are rolled into smooth circular cross-sections and are supplied in the form of discs, with a diameter of not more than 10mm and a length of 6m~12m. |
| Ribbed steel bars | There are three types: spiral, herringbone and crescent. Generally, Grade II and III steel bars are rolled into herringbone shapes, and Grade IV steel bars are rolled into spiral and crescent shapes. |
| Steel wires | Divided into low-carbon steel wires and carbon steel wires) and steel strands. |
| Cold-rolled twisted steel bars | cold-rolled and cold-twisted. |
| 4. Classification according to mechanical properties | |
| Grade I Steel Rebars | 300/420 |
| Grade II Steel Rebars | 335/455 |
| Grade III Steel Rebars | 400/540 |
| Grade IV Steel Rebars | 500/630 |
| 5. Classification according to function in structure | |
| Tension Rebars | Steel Rebars that bear tensile and compressive stress. |
| Hoop Rebars | Bear part of the diagonal tensile stress and fix the position of the tension bars, mostly used in beams and columns. |
| Frame Rebars | Used to fix the position of the steel hoops in the beam, forming the steel skeleton in the beam. |
| Distribution Rebars | Used in roof panels and floor slabs, arranged vertically with the tension bars of the slabs, evenly transferring the weight to the tension bars, fixing the position of the tension bars, and resisting the temperature deformation caused by thermal expansion and contraction. |
| Others Rebars | Structural bars configured due to component construction requirements or construction and installation needs. Such as waist bars, embedded anchor bars, prestressed bars, rings, etc. |
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