Aluminum alloy sheet having excellent formability, strength, and exterior quality, and method of manufacturing same

Abstract

Provided is an aluminum alloy sheet excellent in formability, strength, and quality of appearance. The sheet is composed of an aluminum alloy containing 1.00 to 2.20 mass % of Fe and 0.10 to 1.00 mass % of Mn, with a balance of Al and unavoidable impurities. The sheet is fabricated by rolling. In each of the 0° direction, 45° direction, and 90° direction relative to the rolling direction, the sheet has a total elongation of 34% or more, and has a 0.01% proof stress of 60 MPa or more after application of 2% uniaxial strain and a subsequent heat treatment at 170° C. for 20 minutes.

1 . An aluminum alloy sheet excellent in formability, strength, and quality of appearance, the sheet comprising an aluminum alloy comprising:
 1.00 to 2.20 mass % of Fe and 0.10 to 1.00 mass % of Mn, with a balance of Al and unavoidable impurities, wherein   the sheet is fabricated by rolling, and   in each of a 0° direction, 45° direction, and 90° direction relative to a rolling direction, the sheet has a total elongation of 34% or more, and has a 0.01% proof stress of 60 MPa or more after application of 2% uniaxial strain and a subsequent heat treatment at 170° C. for 20 minutes.   
     
     
         2 . The aluminum alloy sheet excellent in formability, strength, and quality of appearance according to  claim 1 , wherein the aluminum alloy further comprises one or two elements selected from 0.01 to 0.20 mass % of Cu and 0.005 to 0.100 mass % of Ti. 
     
     
         3 . The aluminum alloy sheet excellent in formability, strength, and quality of appearance according to  claim 1 , wherein the sheet is applied to an automobile body panel. 
     
     
         4 . The aluminum alloy sheet excellent in formability, strength, and quality of appearance according to  claim 2 , wherein the sheet is applied to an automobile body panel.