Seamless steel pipe is perforated with round steel, the surface of the steel pipe without weld is called seamless steel pipe. According to the production method, seamless steel pipe can be divided into hot rolled seamless steel pipe, cold rolled seamless steel pipe, cold drawn seamless steel pipe,

With the continuous development of oil and gas pipelines to large diameters and high pressures, spiral submerged arc welded steel pipes also continue to develop to large diameters, large wall thicknesses and high steel grades. The double wire submerged arc welding process is playing more and more in

Spiral steel pipes belong to welded pipes, which refer to seamless steel pipes with seams on the surface that are welded by electric welding after bending into a ring or a square with steel chains or thick steel plates.The ingredients selected for the welded pipe are thick steel plates or hot-rolled

Spiral steel pipe is made by rolling low-carbon carbon structural steel or low-alloy structural steel strip into a tube blank at a certain spiral angle (called forming angle), and then welding the tube seam together. It can be made with a narrower strip Steel produces large diameter steel pipes. Its