Steel pipe

Steel pipes can be classified according to rolling process, whether there is seam or not and section shape. According to the classification of rolling process, the steel pipe can be divided into hot-rolled steel pipe and cold-rolled steel pipe; according to whether the steel pipe has seam, the steel pipe can be divided into seamless steel pipe and welded steel pipe, and the commonly used welded steel pipe can be divided into high-frequency welded pipe, longitudinal submerged arc welded pipe and spiral submerged arc welded pipe according to the type of weld.