spiral pipe and standard classification: confined liquid transportation with spiral arc-welded steel pipe (SY5036-83) is mainly used in oil and gas pipelines, Pressure liquid transportation with spiral arc-welded steel (high frequency welding SY5038-83), with high frequency welding method of welding joints, used for pressure fluid transmission of spiral arc-welded steel welding. Steel pipe pressure ability, good, facilitate plastic welding and processing &forming, Generally low liquid transportation with spiral arc-welded steel pipe (SY5037-83) with double-face automatic submerged arc welding or one-sided welding for water into steam, gas and air and low flow conveying commonly use submerged arc welding steel.