3003 aluminum alloy is an alloy in the wrought aluminum-manganese family (3000 or 3xxx series). It is readily machined for the different applications. It can either be formed using conventional hot working or cold working.Like most other aluminum-manganese alloys, 3003 is a general-purpose alloy with moderate strength, good workability, and good corrosion resistance.The 3003 aluminum coil is 20% stronger than 1100 grade alloys because it is fused with manganese.