| 摘要 |
<p>An aluminum alloy plate which has a chemical composition, in mass %: Mg: 0.3 to 1.0 %, Si: 0.3 to 1.2 %, Fe: 0.10 to 1.0 %, Mn: 0.05 to 0.5 %, provided that Fe + Mn >= 0.2 %, and the balance: Al and inevitable impurities, has an average re-crystallization grain diameter of 25 mum or less, and contains an intermetallic compound having a diameter of a corresponding circle of 1 to 6 mum in an amount of 5000 pieces/mm<2> or more; the aluminum alloy plate further comprising 0.5 to 1.0 % of Cu, 0.1 to 0.4 % of Zr, 0.05 % or less of Ti or 0.05 % or less of Ti and 0.01 % or less of B; and a method for producing the aluminum alloy plate which comprises pouring a molten alloy having the above composition in the inside of facing rotary belt casting molds being forcedly cooled, solidifying at a cooling rate at the time of solidification of 40 to 90˚C/sec to form a slab having a thickness of 5 to 10 mm, drawing the slab from the side opposite to that for pouring, rolling the slab directly or after winding into a coil form, thereby subjecting the alloy to a solution heat treatment. The aluminum alloy plate is excellent in press formability and continuous resistance spot weldability.</p> |
