Continuous pipe rolling machine is a high-efficiency rolling mill, which can be divided into multiple stands (7-9 stands) and few stands (3-4 stands). There are two ways of core rod movement: one is when the core rod moves freely with the pipe during rolling, and the continuous rolling pipe at this time is called floating core rod continuous rolling pipe; Another type is when the movement speed of the core rod is limited and controllable during pipe rolling, and this type of continuous rolling pipe is called a limited motion core rod continuous rolling pipe.