Kayayyakin ƙirƙira galibi sun ƙunshi ƙarfe na carbon da ƙarfe na gami da nau'ikan abubuwa daban-daban, sannan aluminium, magnesium, jan karfe, titanium da gami da su. Jihohin asali na kayan sun haɗa da mashaya, ingot, foda na ƙarfe, da ƙarfe na ruwa. Matsakaicin yanki na giciye na ƙarfe...
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