Alloy steels contain varying proportions of alloying elements (such as manganese, silicon, nickel, titanium, copper, chromium, and aluminum) to control steel properties such as hardenability, corrosion resistance, strength, formability, weldability, or ductility . Bambancin suna da ɗan uniform, amma saboda kare-bambancen gaske, duk mayoy, ba carbon da Allos, suna dauke da manyan-lovery shanu. Alloy Karfe yana da wahala, mafi dorewa, kuma mafi jure wa lalata. Alloysirshin tare da matsakaici zuwa babban abun ciki na Carbon suna da wahalar weld. Koyaya, idan abubuwan carbon an rage zuwa 1% zuwa 3%, wannan ƙarfe seloy na iya cimma babban tsari da walwala, ta hanyar karuwa sosai.