According to different production methods, it can be divided into hot rolled pipe, cold rolled pipe, cold drawn pipe, kneading pipe, etc. Hot rolled seamless pipe is generally produced on the active tube rolling unit. After checking and eliminating the appearance shortcomings, the solid tube billet is cut into the required length, centered on the end face of the perforating end of the tube billet, and then sent to the heating furnace for heating, and perforated on the piercing machine.

The production process

In the perforation together with continuous rotation and marching, in the effect of the roll and the head, the tube blank gradually formed a cavity, called capillary tube. Then it is sent to the active pipe mill for rolling. Finally, the whole wall thickness of the whole machine is even, and the diameter of the sizing machine reaches the standard requirements. The use of continuous rolling mill to produce hot rolled seamless steel pipe is a more progressive approach.

If you want to obtain a smaller scale and better quality seamless pipe, must choose cold rolling, cold drawing or the combination of the two methods. Cold rolling is usually carried out on a two-high mill length. The steel pipe is rolled in a circular pass consisting of a circular groove of variable section and a fixed conical head.

Cold drawing is usually carried out in 0.5~100T single or double chain cold drawing. (Kneading method is to put the heated tube blank in the closed kneading cylinder, and the perforation rod and kneading rod move together, so that the kneading piece is extruded from the smaller die hole. This method can produce smaller diameter steel pipe