Patent ID: 8524015

Claim:
An aluminum alloy sheet having excellent bake softening resistance and having a recrystallized grain structure, characterized by containing, as a percentage of mass, 2-5% magnesium, over 0.05% and 1.5% or less iron, 0.05-1.5% manganese, and crystal grain refiner, the remainder comprising aluminum and inevitable impurities, and among the inevitable impurities, the amount of silicon being less than 0.15%, the total amount of iron and manganese being greater than 0.4%, the amount of iron dissolved in solid solution being 70 ppm or greater, 5000 or more intermetallic compounds with a circle-equivalent diameter of 1-6 μm existing per square millimeter, and in addition, the average recrystallized grain diameter being 20 μm or below.