Ibikoresho bya Black Iron Square Tube nibikoresho bikonje bikonje bya karuboni hamwe nuburebure bwurukuta 0,6mm kugeza kuri 2.0mm.Iyo icyuma gikonje gikonje gishyushye ubushyuhe bwa annealing, ibara ryubuso rihinduka umukara kubera ubushyuhe bwinshi bwo guhura numwuka.Yitwa kandi ubukonje buzengurutse umukara annealed kare ikoreshwa cyane mubyuma.