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 The large diameter spiral pipe pressure fluid transport Spiral Welded Steel Pipe (SY5036-83) is mainly used for transporting oil, natural gas pipelines; pressure fluid transmission high frequency welded steel pipes with spiral seam (SY5038-83), using high-frequency welding, lap welding method used for pressure fluid transmission spiral seam of high-frequency welded steel pipe. Bearing capacity of steel pipe, plastic, for easy welding and processing; low pressure fluid transmission spiral submerged arc welded pipe (SY5037-83), using double-sided automatic submerged arc welding or single-sided welding into the legal system for water, gas, air and steam, low pressure fluid SAW pipe. The commonly used standard spiral is generally divided into: SY/T5037-2000 (Ministry of standard, also known as the common fluid pipeline with spiral submerged arc welded pipe), GB/T9711.1-1997 (GB, also known as oil and gas industry transportation The first part of steel - Technical delivery conditions: Pipes of requirement class A (the current demanding GB/T9711.2 B grade steel pipe)), API-5L (American Petroleum Institute, also known as line pipe; which is divided into two the PSL1 and PSL2 level), SY/T5040-92 (piles with spiral submerged arc welded pipe) spiral Material: Q235A, Q23b, 0Cr13 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb of Q345 L245 L290 X42 X46 of X70 X80 X95 characteristics: Longitudinal production simple process, high production efficiency, low cost, rapid development. The strength of the spiral welded pipe is generally higher than the Longitudinal, can narrow the billet production of large diameter pipe, you can also use the same width of the billet production of different diameters of pipe. However, compared with the same length of straight seam pipe, the weld length increased by 30 to 100%, and lower production rate. Therefore, smaller diameter pipe mostly straight seam welded pipe of large diameter are mostly spiral welded