There are two common classification methods for rebar: one is based on geometric shape classification, which classifies or types rebar according to the cross-sectional shape of the ribs and the spacing between ribs. For example, in the British Standard (BS4449), rebar is classified into Type I and Type II. This classification method mainly reflects the gripping performance of threaded steel. The second is based on performance classification (grade), for example, according to the current implementation standard in China, threaded steel is classified into three grades based on strength grade (yield point/tensile strength) in (G B1499.2-2024); According to the Japanese Industrial Standard (JI SG3112), rebar is divided into five types based on its comprehensive performance; The British Standard (BS4461) also specifies several grades for performance testing of threaded steel. In addition, rebar can be classified according to its purpose, such as ordinary steel bars for reinforced concrete and heat-treated steel bars for prestressed reinforced concrete.