Dub Hlau Square Tube khoom yog txias dov carbon steel pluaj nrog phab ntsa thickness 0.6mm txog 2.0mm.Thaum txias-kuav los tiag steel pluaj yog rhuab mus rau lub annealing kub, cov xim saum npoo yuav tig dub vim kub kub tiv nrog huab cua.Kuj hu ua txias dov dub annealed square raj uas yog dav siv rau steel qauv.