... black,galvanized etc 4.Build structure etc. carbon steel SHS,RHS,CHS mild steel welded square profile/rectangular profile/hollow section ... Haiyunda Metal Material Co.,Ltd.Rectangular hollow section/Square steel pipe,Rectangular pipeDimensionSquare pipe:15*15-600*600Rectangular ... metric ton per monthOther ProductOval steel pipe/tube,Welded pipe/tube,Galvanized pipe/tube,Steel strip,Hollow section pipe/ ...