Spiral pipes, also known as spiral steel pipes or spiral welded pipes, are made by rolling low-carbon structural steel or low alloy structural steel strips at a certain helix angle (called forming angle) into pipe blanks, and then welding the pipe seams together. It can produce large-diameter steel pipes from narrower strip steel.
The application of solvents and emulsions to clean the surface of steel to remove oil, grease, dust, smoothing agents, and similar organic substances, but it cannot remove rust, oxide skin, welding flux, etc. on the surface of steel, so it is only used as an auxiliary measure in anti-corrosion production.
The commonly used standards for spiral pipes are generally divided into: SY/T5037-2018 (ministerial standard, also known as spiral seam submerged arc welded steel pipes for ordinary fluid transmission pipelines), GB/T9711.1-1997 (national standard, also known as the delivery technical conditions for oil and gas industry transmission steel pipes - Part 1: Class A steel pipes (GB/T9711.2 Class B steel pipes with strict requirements), API-5L (American Petroleum Institute, also known as pipeline steel pipes; divided into two levels: PSL1 and PSL2) SY/T5040-92 (Spiral submerged arc welded steel pipes for piles).