... RHS,CHS mild steel welded square profile/rectangular profile/hollow section/deformed profileTianjin Haiyunda Metal Material Co.,Ltd.Rectangular hollow ... section/Square steel pipe,Rectangular pipeDimensionSquare pipe:15*15-600* ... tube,Welded pipe/tube,Galvanized pipe/tube,Steel strip,Hollow section pipe/tube/channel(C,U,V,H,I,figure-8 ...