... (Longitudinal Submerge-arc Welded) (UOE)、JCO(JCOE) DSAW (Double Submerged arc welded) Quality Standard: LSAW steel pipe, DSAW steel pipe: GB/ ... Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless EN10217 Welded steel tubes for pressure purposes. Technical delivery conditions ... , L415, L450, L485, L555 Size: LSAW steel pipe, DSAW: Outer Diameter: 219mm-2820mm Wall Thickness: 5.0mm-70mm Length ...