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 . Differentias sunt aliquantum uniformis, sed propter distinctionem, omnes steels in VIII% per pondus, non ipsum et Alloys, sunt considerari summus ally steels. Alloy ferro durius, durabile et magis repugnant ad corrosio. Alloy steels cum moderari ad altum ipsum contentus sunt difficile ad weld. Autem, si carbo carbonis contentus est ad I% ad III%, hoc ally metallum potest consequi altiorem formability et weldability, ita augendae vires.