①Main production process of hot-rolled seamless steel pipe (main inspection process):Tube billet preparation and inspection → tube billet heating → perforation → pipe rolling → steel pipe reheating → fixed (reduced) diameter → heat treatment △ → finished pipe straightening → finishing → inspection (

In the appearance of steel pipes, the difference between seamless steel pipes and welded steel pipes is that the inner wall of the welded pipe has welding ribs, while the seamless steel pipe does not. The pressure of seamless pipes is higher. Welded pipes are generally around 10 MPa. Now welded pipe

The quality of the steel pipe is not only related to its service life, but also related to its use efficiency. Then when we are buying steel pipes, we can roughly distinguish the quality of the steel pipes by the appearance of the steel pipes. If the surface of the steel pipes has numbness and is no