... ERW Galvanized Steel Pipe High Quality the details: steel gradeQ195standardASTM A53-2007,JIS G3101,GB/T 13793-1992thicknessfrom 0.4mm to 2.0mmor ... as the requirement of the clientssection shaperound,square,rectangular,ovalOD(mm)round:14,16,19,22 ... ,25,32,38,50,55square:15*15,19*19,25*25,30,*30,40*40rectangular ...