Domin inganta wasu kaddarorin karfe kuma ta haka nemo wasu kaddarori na musamman a cikin aikin narka abubuwan da aka kara da gangan da ake kira alloying element. Abubuwan da aka saba amfani da su sune chromium, nickel, molybdenum, tungsten, vanadium, titanium, niobium, zirconium, cobalt, silicon, ...
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