Characteristics of welded steel pipe

　　Low carbon structural steel or low alloy structural steel strip is rolled into tube blank according to a certain spiral angle (called forming angle), and then welded up by pipe seam. It can produce Welded steel pipe with narrow strip steel. Welded steel pipe is mainly used for pipeline transportation of oil and natural gas, and its specification is expressed by outer diameter * wall thickness. Welded steel pipe with one-side welding and two-side welding, welded steel pipes should ensure that the hydraulic test, weld tensile strength and cold bending performance to meet the requirements.

　　Strength is generally higher than that of straight seam A53 Gr. B Carbon Steel Hot Rolled Welded Steel Pipe. Large diameter welded steel pipes can be produced with narrow blanks, and different diameter welded steel pipes can also be produced with blanks of the same width. However, compared with the straight seam pipe of the same length, the weld length is increased by 30~100% and the production speed is low. Therefore, small diameter welded pipes are mostly welded longitudinally, while large diameter welded steel pipes are mostly spiral welded.