Aluminum alloy sheet with excellent formability and paint bake hardenability and method for production thereof
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United States of America Patent
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app pub date -
Mar 21, 2008
filing date -
Mar 28, 2001
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Abandoned
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Abstract
A sheet of a 6000 type aluminum alloy containing Si and Mg as main alloy components and having an excellent formability sufficient to allow flat hemming, excellent resistance to denting, and good hardenability during baking a coating, which exhibits an anisotropy of Lankford values of more than 0.4 or the strength ratio for cube orientations of the texture thereof of 20 or more, and exhibits a minimum bend radius of 0.5 mm or less at 180.degree. bending, even when the offset yield strength thereof exceeds 140 MPa through natural aging; and a method for producing the sheet of the aluminum alloy, which includes the steps of subjecting an ingot to a homogenization treatment, cooling to a temperature lower than 350.degree. C. at a cooling rate of 100.degree. C./hr or more, optionally to room temperature, heating again to a temperature of 300 to 500.degree. C. and subjecting it to hot rolling, cold rolling the hot rolled product, and subjecting the cold rolled sheet to a solution treatment at a temperature of 400.degree. C. or higher, followed by quenching.
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