Pipe 1.Grade:SGCC DX51D DX53D DX54D, etc 2.Wall Thickness: ... diameter 6 mm to 219mm, square pipe with range from 10x10 to 100x100,and rectangular pipe with range from 20x10 to 150x100 , with ... do the whole processes, such as cold rolling, annealing, slitting, pipe making and so on, because of everything is under our ...