... 3.Length:1-6m,or as require 4.Grade:10#-45#,Q195-Q345 5.Standard: BS,GB,ASTM Welding steel pipe ... ,GB/T8162,GB/8163,ASTM A106-2006 Grade 10#,20#,45#,Q235,Q195,Q215Length1-6m, or as customers requestmentsToleranceA)Outer diameter ... contact us. We look forward to working with you. Hign-frequency longitudinal welded steel tube,oil and gas pipe welding