Commonly used standards for spiral pipes are generally divided into: SY/T5037-2018 (ministerial standard, also called spiral submerged arc welded steel pipe for ordinary fluid transportation pipelines), GB/T9711.1-1997 national standard, also called oil and gas industry transportation steel pipe exchange The first part of the cargo technical conditions: Class A steel pipes with strict requirements include GB/T9711.2 Class B steel pipes, API-5L American Petroleum Institute, also called pipeline steel pipes; which are divided into two levels: PSL1 and PSL2, SY/T5040-92 piles Use spiral seam submerged arc welding of steel pipes.
Spiral submerged arc welded pipes for pressure-bearing fluid transportation are mainly used in pipelines for transporting oil and natural gas. Steel pipes have strong pressure-bearing capacity, good plasticity, and are easy to weld and process. Generally, spiral submerged arc welded steel pipes for low-pressure fluid transportation adopt double-sided automatic Submerged arc welded steel pipes made by submerged arc welding or single-sided welding and used for the transportation of general low-pressure fluids such as water, gas, air, and steam.
Features of spiral pipe: 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 spiral welded pipes is generally higher than that of straight seam welded pipes. Welded pipes with larger diameters can be produced from narrower billets, and welded pipes with different diameters can also be produced from billets of the same width. However, compared with straight seam pipes of the same length, the weld length is increased by 30~100%, and the production speed is lower. Therefore, smaller diameter welded pipes mostly use straight seam welding, while large diameter welded pipes mostly use spiral welding.
Commonly used spiral pipe materials in China generally include: Q235A, Q235B, Q345, L245, L290, X42, X52, X60, X70, X80, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb.
