alloy steel In addition to iron and carbon, other alloy elements are added to the steel, which is called alloy steel. An iron-carbon alloy formed by adding an appropriate amount of one or more alloying elements to an ordinary carbon steel. According to the different added elements, and adopt appropriate processing technology, can obtain high strength, high toughness, wear resistance, corrosion resistance, low temperature resistance, high temperature resistance, non-magnetic and other special properties.