Conveying fluid under pressure, using spiral seam submerged arc welded steel pipe SY5036-2000, mainly used to transport oil and natural gas pipelines;

Spiral seam high-frequency welded steel pipe SY5038-2000 for pressure fluid transportation, spiral seam high-frequency welded steel pipe welded by high-frequency lap welding. The steel pipe has strong bearing capacity and good plasticity, which is convenient for welding and processing;

For general low-pressure fluid transportation, the spiral seam submerged arc welded steel pipe SY5037-2000 is made by double-sided automatic submerged arc welding or single-sided welding method for general low-pressure fluid transportation of water, gas, air and steam.

The commonly used standards for spiral steel pipes are generally divided into: SY / T5037-2008 (mini standard, also called spiral seam submerged arc welded steel pipe for general fluid transportation pipelines), GB / T9711.1-2008 (national standard, also called oil and gas industry transportation steel pipe Delivery Technical Conditions Part I: Grade A steel pipe (strictly required GB / T9711.2 Grade B steel pipe)), API-5L (American Petroleum Institute, also known as pipeline steel pipe; which is divided into PSL1 and PSL2 two levels) SY / T5040-2008 (spiral welded steel pipe for piles).

SY / T5037-2008 is the standard set by the Ministry of Petroleum, and is generally called the Ministry Standard.

GB / T9711.1-2008 National Spiral Pipe, Steel Pipe for Oil and Gas Industry Transportation, Grade A

General high-pressure welded steel pipe for low-pressure fluid transportation (SY5039-2000) uses hot-rolled steel coil as the tube blank, which is often hot spiral formed, and is welded by high-frequency lap welding method Frequency welded steel pipe.

Spiral welded steel pipe for piles (SY5040-2000) is made of hot-rolled steel strip coil as a billet, which is often spirally shaped and made by double-sided submerged arc welding or high-frequency welding. Steel pipes for foundation piles