... cooperation relation.For any information, contact us freely!Nameastm a53b erw pipeItemsSquare pipes, round tubes, oval pipes, special shaped pipes, ... empaistic pipes, fittingsStandardASTM A106-2006,ASTM A210-1996,GB 5130,API 5L,DIN EN 10217-1-2005Material GradeQ235,Q245 ... pipes, empaistic pipes, fittingsStandardASTM A106-2006,ASTM A210-1996,GB 5130,API 5L,DIN EN 10217-1-2005Material GradeQ235, ...