... spiral welded structure pipes 1.8-1240mm*1-200mm 2. good quality ,black 3.large stock We produce these SSAW Steel Pipes ... , GB/T9711.2-1999,DIN,JIS,BS,EN,etc.5) Steel Grade: API5L Gr. B, X 42, X46, X52, X56, X60 ... )Air Pipeline 8) Common Gas Pipelines 9) ConstructionFoundation Pile 10) Steel Structure Buildings 11) SteelStructure Bridges 12) Seaports and Docks etc. good ...