Yueyang spiral pipe丨Hunan spiral pipe manufacturer丨Changsha steel market

< . . Standards

. . Commonly used standards are generally divided into Steel pipe), < /< (national standard, also called oil and gas industry transportation steel pipe delivery technical conditions Part 1: < r< grade steel pipe (strictly demanding < /.B< grade steel pipe < r)< ), < < (U.S. Petroleum Association, also called pipeline steel pipe, which is divided into two levels: < r< and < r<), < r/-< (spiral seam submerged arc welded steel pipe for piles).
. . Classification
. . 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 and good plasticity, and are easy to weld and process to form general low-pressure fluids. Spiral submerged arc welded steel pipes for transportation are made by double-sided automatic submerged arc welding or single-sided welding and are used for the transportation of general low-pressure fluids such as water, gas, air, and steam.
. . Features
. . Characteristics 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. But compared with straight seam pipes of the same length, the weld length is increased by < r3~< 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.