A pipe in which the weld is helically distributed relative to the axis of the pipe body. Mainly used for conveying pipes, pipe piles and some structural pipes. Product specifications: outer diameter 300～3660mm, wall thickness 3.2～25.4mm.

Thick-walled straight seam steel pipe refers to a steel pipe whose outer diameter to wall thickness ratio is less than 20, which is called thick-walled straight seam steel pipe. Mainly used as petroleum geological drill pipe, petrochemical decomposition pipe, boiler pipe, bearing pipe, automobile, t