Hot-rolled seamless steel tubes are generally produced on automatic tube rolling units. After inspection and removal of surface defects, the solid tube blank is cut to the required length, centered on the end surface of the perforated end of the tube blank, and then sent to the heating furnace for heating and perforated on the piercer. While the piercing is continuously rotating and advancing, under the action of the roller and the plug, a cavity is gradually formed inside the tube blank, which is called a capillary tube. And then sent to the automatic tube rolling machine to inherit rolling. The wall thickness is adjusted by the whole machine, and the diameter is determined by the sizing machine to meet the specifications. It is a better method to produce hot-rolled seamless steel tubes by using continuous tube rolling units.