... pipes 4.short delievery time 5.tianjin port Commodity ERW Black steel pipeShapeRound pipeSquare tubeRectangular tubeOuter diameter10*300mm10* ... Length: +/-10%.StandardRound pipe: GB/T3091, BS1387-1987, ASTM A53, DIN2440, EN39-2001.Square/Rectangular tube: GB/T6728-2002, ... GradeQ195, Q215, Q235, Q295, Q345, ST37, ST52, Grade A, Grade B.End finishPlain/ beveled ends or threaded with sockets/coupling and ...