| 摘要 |
[PROBLEMS] The enhancement of strength, the improvement of press workability and bake-hardenability, and the production at a low cost, with respect to an aluminum alloy plate [MEANS FOR SOLVING PROBLEMS] A method for producing an Al-Mg-Si based aluminum alloy plate excellent in bake-hardenability, characterized in that it comprises providing an aluminum alloy melt having a chemical composition, in wt %, that Mg: 0.3 to 1.0 %, Si: 0.3 to 1.5 %, Cu: 1.0 % or less (inclusive of 0 %), Fe: 1.2 % or less (inclusive of 0 %), optionally further Mn: 0.1 to 0.7 % and/or Cr: 0.1 to 0.3 %, and the balance: Al, casting the alloy melt by the twin belt casting method with an average cooling speed during solidification of 20°C/s or higher, setting the temperature of the ingot at the outlet of a casting machine at 250°C or lower, then, without homogenation or hot rolling, subjecting the resultant ingot to cold rolling until the objective plate thickness, and subjecting the cold-rolled product to a solution treatment in a continuous annealing furnace.
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