... DIN,APISPEC5L,API5CT,ASTMA53/A106,JIS,BS1387,etc.3.Steel Grade: Q235B,Q345B,API5L Grade B,X42~X80, ... caps, varnish or as per customers' requirementsProduct namewelded steel pipe/tubeOut diameter20-219mmWall Thickness0.9-12mmStandardGB/T3091-2001Quality gradeFirst ... Low-Pressur Fluid service Construction Foundation Piles, Structure Building,Steel Structure Bridges,Seaports and Docks etc.OtherWe can do ...