Wire rod is the smallest size of the interrupt surface of hot-rolled section steel. In China, the general diameter of 5 ~ 9 mm a total of eight specifications of hot-rolled round steel supplied in rolls is called wire rod. Wire rods are also called wire rods because they are delivered in coils. The concept of wire rod in foreign countries is slightly different from that in China, in addition to the circular section, there are other shapes, and its diameter is inconsistent due to different demand conditions and production technology levels. According to the different rolling mills, it can be divided into two types: high-speed wire rod (high wire) and ordinary wire rod (general wire).