... alloy steel ---Materials: spring steel,carbon/alloystructural steel,auto steel, tool steel, --Standard:AI corrossion resistant alloy steel --Carbon structural steels: The carbon steel (i.e. high quality carbon steel ... element C (short for carbon), alloy steel may contains one or several kinds of alloy element i.e. Si, Mn, ... . on automobile, tractor, vessel, steam turbine, heavy load machine tool, etc.