| 摘要 |
PROBLEM TO BE SOLVED: To provide an Al-Mg-Si-based alloy hot rolled sheet which does not depend on the increase in the amount of Mg, and whose crystal grains can be refined even if the content of Mg is made extremely low, thus producible at a low cost and having high strength, and whose surface properties are satisfactory as well. SOLUTION: Disclosed is an Al-Mg-Si-based alloy hot rolled sheet with a thickness of 1.5 to 10 mm having a composition comprising, by weight, 0.2 to 2.5% Mg, 0.3 to 2.0% Si, 0.01 to 1.0% Mn and 0.001 to 1.0% Cu, and the balance Al with inevitable impurities, and in which each average crystal grain size in the sheet thickness surface layer part and the sheet thickness central part is≤90μm, respectively. Also disclosed is a method for producing the Al-Mg-Si-based alloy hot rolled sheet. COPYRIGHT: (C)2008,JPO&INPIT
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