Round steel refers to long solid steel with circular section. Among them, the small round steel of 5.5-25mm is mostly supplied in bundles by straight bars, which is often used as reinforcement, bolts and various mechanical parts; Round steel larger than 25mm is mainly used for manufacturing mechanical parts or seamless steel tube billets. It has a wide range of applications and can be applied to automobile parts, geological exploration, bearings, machining and so on. Compared with welded pipes, it has better performance and surface quality can meet certain requirements. It is generally used in various fields of industry, such as petrochemical, papermaking, nuclear energy, food, beverage, medicine and other industries, which have high requirements for fluid medium.