3003 aluminum alloy is an alloy in the wrought aluminum-manganese family (3000 or 3xxx series). It can be cold worked (but not, unlike some other other types of aluminum alloys, heat-treated) to produce tempers with a higher strength, but a lower ductility. Like most other aluminum-manganese alloys, 3003 is a general-purpose alloy with moderate strength, good workability, and good corrosion resistance. It is commonly rolled and extruded, but typically not forged. As a wrought alloy, it is not used in casting. It is also commonly used in sheet metal applications such as HVAC, hinges, condensers, radiators, evaporators, heat shields, gutters, downspouts, and roofing and siding.