(also known as disc disc/wire) is the smallest section size in the hot rolling process. In China, generally 5 ~ 9mm diameter of a total of eight specifications of hot rolled round steel supply in rolls called wire. Wire delivery due to coil, it is also called wire rod. Abroad the concept of wire and our country is slightly different, besides the circular section also has other shape, its diameter because of demand situation and production technology level is different and inconsistent, according to the rolling mill can be divided into high-speed wire (high line) and ordinary wire (common line) two kinds.