... .OD:15*15mm-600*600mm 3.Gal shs,rhs,chs 4.Build structure etc. galvanized hollow section CHS,SHS,RHS,GAL.Tianjin Haiyunda Metal Material Co.,Ltd ... ton per monthOther ProductOval steel pipe/tube,Welded pipe/tube,Galvanized pipe/tube,Steel strip,Hollow section pipe/tube/channel(C ...