The difference between rebar and round bar and rebar distinction plain bars is a surface with longitudinal ribs and transverse ribs, usually with two road along the longitudinal direction of the longitudinal ribs and transverse ribs evenly distributed. Rebar is a small steel steel, mainly for the skeleton of reinforced concrete building elements. In use, it requires a certain degree of mechanical strength, bending welding performance and process performance. Production of steel billets as raw material through carbon steel or low-alloy structural steel, finished steel smelting process of calming hot-rolled forming, normalizing or hot-rolled delivery. Properties and Uses widely used in civil engineering construction of buildings, bridges, roads and the like. Great to highways, railways, bridges, culverts, tunnels, flood control, dams and other public facilities, housing construction on the basis of small, beams, columns, walls, slabs, steel structural materials are essential. With the degree of urbanization of the deepening, infrastructure construction, real estate booming strong demand for rebar. Basic types of steel commonly used classification in two ways: First, the geometry of the tree, according to the cross-sectional shape of the ribs and rib spacing or different classification type, such as British Standard (BS4449), the rebar into Ⅰ type, Ⅱ type. This classification main reaction grip performance of rebar. Second, the performance classification (class), such as our current performance standards, rebar (G B1499.2-2007) wire for the 1499.1-2008), press the intensity level (yield point / tensile strength) rebar into 3 grade; Japanese Industrial Standard (JI SG3112), press the overall performance will be divided into five types of steel; British Standard (BS4461), and also provides a number of performance tests grade steel. But it can also be classified by purpose steel, such as reinforced concrete into ordinary reinforced and prestressed concrete steel and other heat treatment.