Double-sided submerged arc welded spiral steel pipe has the advantages of high pressure capacity, low resistance, low temperature resistance, corrosion resistance, convenient installation and maintenance, etc., and is more and more welcomed by oil and gas, slurry transportation, urban construction and other industries. The process flow is first carried out. Full board ultrasonic inspection.

The ministry standard spiral steel pipe is SY/T5037-2000 (spiral submerged arc welded steel pipe for common fluid transportation pipeline). This standard is the ministry standard and GB/T9711 is the national standard. The national standard has higher requirements for steel pipes than the ministry standard.

Spiral pipe is also called spiral steel pipe or spiral welded pipe. It is made of low carbon structural steel or low alloy structural steel strip according to a certain spiral angle (called forming angle), and then the pipe seam is welded. It can produce large diameter steel pipe with narrow strip.

Spiral welded pipe: low carbon carbon structural steel or low alloy structural steel strip is rolled into a tube blank according to a certain spiral angle (called forming angle), and then the pipe seam is welded together. It can produce large diameter steel pipe with narrow strip steel. Its specifications are expressed by outer diameter * wall thickness. The welded pipe shall ensure that the hydraulic test, the tensile strength and cold bending performance of the weld meet the requirements.