1.API 5L spiral steel pipe/ERW pipe/welded tube. 2.OD:12. ... .5mm-25mm,Length:6m-18m. 3.API&ISO certification. API 5L spiral steel pipe/ERW pipe/welded tube.1.API ... steel pipe1)Standards: SY/T5037-2001 GB/T9711.1 API 5L ASTM DIN2)Material :PSL1 A \B \ X42 \ X46\ X52 \X56 ... , Pallets, Hydraulic Platforms, Trusses, Columns, Purlins, Greenhouse Stands Towers API 5L spiral steel pipe/ERW pipe/welded tube.