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Likhoele tse ntšo tse entsoeng ka tšepe tse ntšo
Cold rolled black annealed coils (CRBA), e tsejoang hape e le "Blue Steel".CRBA ke adikoele tse tshepe tse batangtse 'nileng tsa oxidized ka annealing ka tlhomamiso e khethehileng e le hore ho hlahisa lera e tšesaane haholo magnetite (Fe304) holim'a metsi (tlase ho 1 μm botenya) bakeng sa tšireletso e eketsehileng.