Copper alloy is alloy based on copper, in which the main alloying elements are Zn, Sn, Si, Al, Ni. Cu-based alloys constitute mostly substitutional solid solutions. High purity copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. Alloy steel is a type of steel made from different metal alloys that come from iron, carbon, and high amounts of other elements. It's one of the most popular types of metal, and it's called alloy steel because of the elements used to make alloy steel form alloys when mixed. http://www.chinamic-6.com/copper-alloy/