Standard classification of submerged arc welded steel pipe:

Spiral seam submerged arc welded steel pipe (SY5036-83) for pressurized fluid transportation is mainly used for pipelines for transporting oil and natural gas;

Spiral seam high frequency welded steel pipe for pressurized fluid transportation (SY5038-83), welded by high frequency lap welding, spiral seam high frequency welded steel pipe for pressurized fluid transportation. The steel pipe has strong pressure bearing capacity and good plasticity, which is convenient for welding and processing;

Spiral seam submerged arc welded steel pipe (SY5037-83) for low-pressure fluid transportation, made by double-sided automatic submerged arc welding or single-sided welding, used for low-pressure fluid transportation such as water, gas, air and steam.