Rebar and wire are unique to China, and there is no outer disk. Because the steel industry is a sunset industry in developed countries such as Europe and America, the amount of new housing starts in Europe is not as good as that in cities like Beijing. Rebar and wire futures were officially listed on Shanghai Futures Exchange on March 27th, 2009.

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. H, r and b are the initials of the words Hotrolled, Ribbed and Bars, respectively. Hot rolled ribbed steel bars are divided into three grades: Grade II HRB335 (old brand name 20MnSi), Grade III HRB400 (old brand names 20 mnsi, 20MnSiNb and 20Mnti) and Grade IV HRB500.

Wire rod refers to hot rolled round steel with a diameter of 5-22mm or special-shaped steel equivalent to this section. Because it is delivered in the form of wire, it is also called wire. The circumference of wire section is very small, and the diameter of common product specifications is 5-13 mm. According to different rolling mills, it can be divided into high-speed wire (high-speed wire) and ordinary wire (ordinary wire).