ALUMINUM ALLOY PLATE AND PROCESS FOR PRODUCING THE SAME

摘要

This invention provides a high-Mg Al-Mg-base alloy plate, which can be applied to outer panels and inner panels of automobiles and has improved press moldability and homogeneity. The Al-Mg-base aluminum alloy plate has a plate thickness of 0.5 to 3 mm and is prepared by casting and cold rolling by a twin-roll continuous casting method. The Al-Mg-base aluminum alloy plate comprises, by mass, Mg: more than 8% and not more than 14%, Fe: not more than 1.0%, and Si: not more than 0.5% with the balance consisting of Al and unavoidable impurities. The average electrical conductivity of the aluminum alloy plate is in the range of not less than 20 IACS% and less than 26 IACS%. The aluminum alloy plate has such a material property that strength/ductility balance (tensile strength × total elongation) is not less than 11000 (MPa%), whereby press moldability including plate homogeneity can be improved.