Spiral pipes, also called spiral steel pipes or spiral welded pipes, are made by rolling low carbon structural steel or low alloy structural steel strips into pipe blanks at a certain spiral angle (called forming angle) and then welding the pipe seams. It can produce large-diameter steel pipes from narrower strips of steel. Spiral pipes are mainly used in oil and natural gas transmission pipelines, and their specifications are expressed by outer diameter * wall thickness. Spiral pipes are either single-sided welded or double-sided welded. Welded pipes should ensure that the hydraulic pressure test, tensile strength, and cold bending performance of the weld meet the regulations.
Spiral welded steel pipes are mainly used in water supply projects, the petrochemical industry, the chemical industry, the electric power industry, agricultural irrigation, and urban construction. They are one of the twenty key products developed in my country.

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