Round steel is divided into three types: hot rolled, forged, and cold drawn. The specifications of hot-rolled round steel are 5.5-250mm. Among them, 5.5-25mm small round steel is mostly supplied in bundles of straight bars, which are often used as reinforcement, bolts and various Machine element; Round steel larger than 25mm is mainly used for manufacturing Machine element, seamless steel tube billets, etc.Number: Q195, Q235, 10, 20, 35, 45, Q215, Q345, 12Cr1MoV, 15CrMo, 304, 316, 20Cr, 40Cr, 20CrMo, 35CrMo, 42CrMo, 40CrNiMo, GCR15, 65Mn, 50Mn, 50Cr, 3CrMo 2w8v, 20crmnti, 5crnnmmo