Rebar is the common name of hot rolled ribbed steel bar. The grade of ordinary hot-rolled steel bar consists of HRB and the minimum yield point of the grade. H, R and B are Hotrolled, Ribbed and Bars, respectively.

There are two commonly used classification methods for rebar: one is geometric shape classification, according to the cross section shape of the rib and the spacing of the rib for classification or typing, such as the British standard (BS4449), the rebar is divided into type I and type II. This classification method mainly reflects the grip performance of rebar. The second is the performance classification (grade), such as China's current implementation standard, rebar is (G B1499.2-2007) wire is 1499.1-2008), according to the strength level (yield point/tensile strength) the rebar is divided into 3 grades; In the Japanese Industrial standard (JI SG3112), rebar is divided into 5 types according to its comprehensive performance; In the British standard (BS4461), a number of grades of rebar performance tests are also specified. In addition, rebar can be classified according to its use, such as ordinary steel bars for reinforced concrete and heat treated steel bars for prestressed reinforced concrete.