Spiral pipe

Spiral pipe, also known as spiral steel pipe or spiral welded pipe, is made by rolling low-carbon structural steel or low-alloy structural steel strip into a tube blank according to a certain helical angle (called forming angle), and then welding the pipe seam. , which can produce large-diameter steel pipes from narrower strips.

Spiral pipes are mainly used for oil and natural gas pipelines, and their specifications are expressed by outer diameter * wall thickness. There are single-side welded and double-sided welded spiral pipes, and the welded pipes should ensure that the hydraulic test, the tensile strength of the weld and the cold bending performance meet the regulations.

Domestic commonly used spiral pipe materials generally include:
Q235A, Q235B, Q345, L245, L290, X42, X52, X60, X70, X80, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb.

Spiral tube features:
The production process of straight seam welded pipe is simple, the production efficiency is high, the cost is low, and the development is rapid.
The strength of the spiral welded pipe is generally higher than that of the straight seam welded pipe, and the welded pipe with a larger diameter can be produced with a narrower billet, and welded pipes with different diameters can be produced with the same width billet.
But compared with the straight seam pipe of the same length, the weld length is increased by 30~100%, and the production speed is lower. Therefore, most of the welded pipes with smaller diameters adopt straight seam welding, and most of the large diameter welded pipes adopt spiral welding.

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