... 600*600 1, the production line of super-large pipes(600*600*25); the pipe sqecification is ... 600, with a wall thickness of 2-25mm and a bending/distorting degree of less than 1/ ... steel ,stainless steel, manganeses steel ,alloy steel and special section pipes(ellipse,lozenge,ect)2,production line ... of high-accuracy cold pipe and opening-type steel section; the pipe specification is ...