The cold cutting saw is centered on the perforating end face of the tube billet and then sent to the heating furnace for heating. The hole is continuously rotated and advanced in the perforating machine at the same time. Under the action of the roller and the head, the blank inside the tube billet is gradually formed into a cavity called capillary, which is then sent to the automatic tube rolling machine for rolling. After the sizing mill sizing, meet the specification requirements, using continuous rolling pipe unit production of hot-rolled seamless steel tube is more advanced methods, if you would like to get a smaller size and better quality seamless tube, must adopt the method of cold rolling cold drawn or both combined cold rolling is usually conducted on two-high rolling mill, steel pipe in variable cross section round hole groove and motionless conical head of rolling in the annular groove.