Patent ID: 9453273
Filing Date: 2016-09-27
CPC Classification: C22C,C22F

Claim Text:
1. An aluminum alloy sheet, comprising: an Al—Mg—Si-based aluminum alloy sheet that comprises, by mass percent, Mg: 0.2 to 2.0%, Si: 0.3 to 2.0%, and Al, and is subjected to solution hardening and reheating as tempering after rolling, wherein when an exothermic peak height in a temperature range from 230 to 270° C. is denoted as A, an exothermic peak height in a temperature range from 280 to 320° C. is denoted as B, and an exothermic peak height in a temperature range from 330 to 370° C. is denoted as C on a differential scanning calorimetry curve, the exothermic peak height B is 20 μW/mg or more, a ratio of the exothermic peak height A to the exothermic peak height B A/B is 0.45 or less, and a ratio of the exothermic peak height C to the exothermic peak height B C/B is 0.6 or less, and when the aluminum alloy sheet is subjected to artificial age hardening of 170° C.×20 min after application of strain of 2%, an increase in 0.2% proof stress in a direction parallel to a rolling direction is 100 MPa or more.