Aluminum alloy sheet excellent in resistance to softening by baking
AssigneeNippon Light Metal Company, Ltd.
InventorsPizhi Zhao, Masaru Shinohara
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Abstract
An aluminum-magnesium alloy sheet having a high strength prior to baking treatment, and having a high bake softening resistance. Contains, as a percentage of mass, 2-5% magnesium, more than 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, less than 0.20% silicon being contained, the total amount of iron and manganese being greater than 0.3%, the amount of iron dissolved in solid solution being 50 ppm or greater, 5000 or more intermetallic compounds with a circle-equivalent diameter of 1-6 μm existing per square millimeter, and the average diameter of the recrystallized grains being 20 μm or smaller.
Claims8
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.
Dependencies are inferred from the claim text.