Seamless steel pipe and welded pipe identification method

Steel pipe appearance, seamless steel pipe and welded steel pipe difference in the welded pipe inside wall has welded rib, while the seamless does not.

Recognition method: look at the inside of the pipe, because the outside will be dealt with, welded pipe is a seam inside some can see, some deal with, it is not easy to see, you can slowly touch with your hand, or look at the specifications, welded pipe are thinner, seamless steel pipe manufacturers, welded pipe is made of stainless steel steel belt with a machine directly (rolled up), seamless is perforated and pierced with a round steel or pipe billet.

Seamless steel pipe production principle

Production and manufacturing methods can be divided into hot rolled pipe, cold rolled pipe, cold drawn pipe, extruded pipe and so on according to different production methods. Hot rolled seamless pipes are generally produced on automatic rolling units. Solid billets are inspected and cleared of surface defects, cut to the required length, centered on the perforated end face of the billet, and then sent to the heating furnace for heating and perforation on the perforating machine. In the piercing at the same time constantly rotating and forward, under the action of the roll and the top head, the internal cavity of the billet is gradually formed, known as the rough pipe. Then sent to the automatic rolling machine to continue rolling. The wall thickness is evened out by the equalizing machine, and the pipe is calibrated by the sizing machine to meet the specifications.