Pressure fluid transportation, spiral seam submerged arc welded steel pipes according to SY5036-2000, mainly used for pipeline transportation of oil and natural gas; Spiral seam high-frequency welded steel pipes for pressure fluid transportation according to SY5038-2000, welded by high-frequency butt welding method, used for spiral seam high-frequency welded steel pipes for pressure fluid transportation. The steel pipes have strong pressure-bearing capacity, good plasticity, and are easy to weld and shape; General low-pressure fluid transportation, spiral seam submerged arc welded steel pipes according to SY5037-2000, made by double-sided automatic submerged arc welding or single-sided welding, used for submerged arc welding steel pipes for the transportation of water, gas, air, and steam, etc. in general low-pressure fluid transportation. Now, the commonly used standards for spiral steel pipes are generally divided into: SY/T5037-2008 (Ministry Standard, also known as general fluid transportation pipeline spiral seam submerged arc welding steel pipes), GB/T9711.1-2008 (National Standard, also known as part of the technical conditions for delivery of steel pipes for the transportation of oil and natural gas industry: Grade A steel pipes (currently, the strict requirement is GB/T9711.2 Grade B steel pipes)), API-5L (American Petroleum Institute, also known as pipeline steel pipes; which is divided into PSL1 and PSL2 two grades), SY/T5040-2008 (pile spiral seam steel pipes). SY/T5037-2008 is the standard set by the Ministry of Petroleum, generally referred to as the Ministry Standard. GB/T9711.1-2008 National Standard Spiral Pipe, Oil and Natural Gas Industry Transportation Steel Pipe, Grade A General low-pressure fluid transportation spiral seam high-frequency welded steel pipes (SY5039-2000) are made from hot-rolled steel strip coils as billets, formed by cold-rolled spiral, and welded by high-frequency butt welding method for general low-pressure fluid transportation spiral seam high-frequency welded steel pipes. Pile Spiral Seam Steel Pipes (SY5040-Black spiral-welded steel pipes, made with double-sided submerged arc welding or high-frequency welding, for civil engineering structures, docks, bridges, and foundation piles.2000) Made from hot-rolled steel strip coils as billets, after