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Iikhoyili zetsimbi ze-Annealed ezimnyama
Iikhoyili ezibandayo eziqengqelekayo ezimnyama (CRBA), ezaziwa ngokuba yi “Blue Steel”.I-CRBA yiiikhoyili zentsimbi ezibandayoeziye oxidized yi annealing kufakelo olukhethekileyo ukwenzela ukuvelisa umaleko magnetite obhityileyo kakhulu (Fe304) kumphezulu (ngaphantsi kwe-1 μm ubukhulu) ukhuseleko ngakumbi.