Hot rolled aluminum plate has low hardness, easy processing, good ductility, relatively low strength, poor surface quality (oxidation / low finish), but good plasticity, generally for the thick plate, mechanical properties are far from cold processing, but also second to forging processing, but has better toughness and ductility.
Cold rolled aluminum plate: high strength and high hardness, relatively difficult to process, but not easy to deformation, high surface finish, generally thin plate, can be used as a stamping plate; due to a certain degree of hardening, low toughness, but can achieve a better yield to strength ratio, used to cold bending spring and other parts, while the yield point is closer to the tensile strength, so the use of the process of danger is not foreseeable, in the load exceeds the allowable load Accidents can easily occur. Most cold-rolled aluminum sheets are less than 4.5 mm thick. Cold-rolled sheet has high hardness and high strength.