Kayayyakin ƙirƙira sun haɗa da ƙarfe na carbon da ƙarfe, sannan aluminium, magnesium, jan karfe, titanium da kayan haɗin gwiwar su. Asalin yanayin kayan shine mashaya, ingot, foda na ƙarfe da ƙarfe na ruwa. Matsakaicin yanki na giciye na ƙarfe kafin da bayan nakasawa shine kira...
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