Wire rod, also called wire rod and steel wire rod, usually refers to small diameter round steel coil. The diameter of wire rod is in the range of 5- 19mm (generally 6-9mm), and its lower limit value is the minimum size of hot rolled steel.

Round steel refers to solid strip steel with circular cross section. Its specifications are expressed in diameter and the unit is millimeter (mm). For example, "50 mm" refers to round steel with a diameter of 50 mm. ..

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.