... 3.Gal shs,rhs,chs 4.Build structure etc. galvanized hollow section CHS,SHS,RHS,GAL.Tianjin Haiyunda Metal Material ... .,Ltd.Rectangular hollow section/Square steel pipe,Rectangular pipeDimensionSquare pipe:15*15-600*600Rectangular pipe:10*20-600*800Thickness:0.5- ... ton per monthOther ProductOval steel pipe/tube,Welded pipe/tube,Galvanized pipe/tube,Steel strip,Hollow section pipe/tube/channel(C,U,V, ...