... .Grade:10#-45#,Q195-Q345 5.Standard: BS,GB,ASTM Welding steel pipe Production Round shape Welded Pipe/Tube Specification andWall ... #,20#,45#,Q235,Q195,Q215Length1-6m, or as customers requestmentsToleranceA)Outer diameter: ± 0.3mmB)Thickness: ± 10% of thicknessC)Length: ± 0.25mm ... . Hign-frequency longitudinal welded steel tube,oil and gas pipe welding