(SY5036-83) is mainly used for conveying oil and natural gas pipelines; high pressure welded steel pipe (SY5038-83) for pressurized fluid transportation with high speed welded pipe for pressurized fluid transportation, High-frequency welding with high-frequency lap welding, high-frequency welded steel pipe for pressurized fluid delivery. (SY5037-83), the use of double-sided automatic submerged arc welding or single-sided welding made of water for the water, the use of high-pressure, Gas, steam and other general low-pressure fluid transmission with submerged arc welded steel pipe is now commonly used standard spiral pipe is generally divided into: SY / T5037-2000 (part of the standard, also known as ordinary fluid piping with spiral submerged arc welded pipe), GB (US Petroleum Institute, also known as pipeline steel pipe), SY / T5040-92 (pile of steel pipe), API-5L (American Petroleum Institute, also known as pipeline steel pipe), SY / T5040-92 (GB, Spiral seam submerged arc welded pipe)