There are three kinds of steel bars, namely HRB400 steel, HRB335 steel and HRB500 steel. Rebar is a common name for hot-rolled ribbed steel bars. The grade of common hot rolled steel bar consists of HRB and the lowest yield point of this grade. Rebar is the steel that must be used for medium-sized and above building components, and China imports a certain batch every year. The export areas are mainly Hong Kong, Macao and Taiwan and Southeast Asia.

There are two common classification methods of steel bars: one is to classify according to the geometric shape of steel bars, and the other is to classify or classify according to the cross-sectional shape of transverse bars and the spacing between bars. For example, steel bars are classified into Type I and Type II in British Standard (BS4449). This classification mainly reflects the grip performance of steel bars.

Second, according to the performance classification (grade), for example, according to the current implementation standards in China, rebar is (G B 1499.2-2007), wire is 1499. 1-2008), and rebar is divided into three grades according to the strength grade (yield point/tensile strength).

In addition, steel bars can also be classified according to their uses, such as ordinary steel bars for reinforced concrete and heat-treated steel bars for prestressed reinforced concrete. There are three main factors that affect the price change of rebar: first, the production cost; Second, the relationship between supply and demand, the factors affecting the relationship between supply and demand are more complicated; Third, speculative factors, which sometimes lead to irrational price rises or falls.