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3003 Aluminum Alloy contains Manganese as its major alloying element. 3003 Aluminum is an alloy with very good corrosion resistance and moderate strength. It is not heat treatable and develops strengthening from cold working only. 3003 Aluminum Alloy has good machinability and welding is readily accomplished by means of conventional welding methods. Commonly used in chemical equipment, ductwork, and in general sheet metal work. 3003 Aluminum is typically used in stampings and the manufacturing of pressure vessels, builder's hardware, garage doors, awning slats, refrigerator panels, gas lines, gasoline tanks, heat exchangers, drawn and spun parts, and storage tanks. All of our 3003 Aluminum Sheet is protected on one side with a protective vinyl film.