... high standard of metal. Main Products Type: Product nameSpiral submerged arc welding steel pipeStandardAPI 5L, GB/T9711,GradeQ235,Q345,B,X42,X52 ... pipeOutside diameter219-2420mmWall thickness5.00-30.00mmLength6-20mTechniqueDouble sides submerged arc welding steel pipeCertificateISO9001:2008, API SPEC 5LPackage detailsin bundles, case packing ...