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Amakhoyili ensimbi amnyama anealed
Cold rolled black annealed coils (CRBA), eyaziwa nangokuthi "Blue Steel".I-CRBA yi-aamakhoyili ensimbi abandayoeziye zafakwa oksijini ngokufakwa ekufakweni okukhethekile ukuze kukhiqizwe isendlalelo sikazibuthe esincanyana kakhulu (Fe304) endaweni (engaphansi kuka-1 μm ubukhulu) ukuze uthole ukuvikelwa okwengeziwe.