Spiral welded steel pipe refers to the steel strip or steel plate bending deformation into circular, square and other shapes and then welded into the surface of the joint steel pipe.

Spiral welded steel pipe common material: Q235A, Q23b,0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb. Q345 L245 L290 X42 X46 X70 X80 Spiral welded steel pipe standard: GB/T9711.1-1997 (national standard, also called oil and natural gas industry delivery steel pipe technical conditions part I: A class steel pipe (up to now strict requirements have GB/ T9711.2-B steel pipe), API-5L (American Petroleum Association, also called pipeline steel pipe; It is divided into PSL1 and PSL2 levels), SY/T5040-92 (spiral seam submerged arc welded steel pipe for pile)

Spiral welded steel pipe production process is simple, high production efficiency, low cost, rapid development. The strength of spiral welded pipe is generally higher than that of straight seam welded pipe, and it can be used to produce larger welded pipe with narrower blank, or different welded pipe with different diameter with the same width blank. But compared with the straight seam pipe of the same length, the weld length increases by 30~100%, and the production speed is lower. Therefore, small diameter welded pipe mostly use straight seam welding, large diameter welded pipe mostly use spiral welding.