... .certificateISO9001-2008 5.Output per month:20000tons MS hollow section for windowSizeW.T20*20----600*6000.7-30MMLength 2--12M , according ... pressure liquid delivery such as water , gas and oil2.For construction , e.g building greenhouseMain market:Middle east, Africa, North and ... Steel Pipe Co.,Ltd is a professional and reputed manufacture, for carbon steel welded pipes and galvanized steel pipes