| 摘要 |
PROBLEM TO BE SOLVED: To provide a 6000 series aluminum alloy sheet for superplastic forming having excellent paint baking hardenability in which coarse abnormal grains are not formed even after superplastic forming, and to provide its production method. SOLUTION: The alloy sheet has a composition containing, by mass, 0.4 to 1.0% Mg, 0.6 to 1.4% Si and >0.4 to 1.0% Mn, and, if required, further comprising prescribed Cr, Ti, B, Fe, Cu and Sn, and the balance Al with inevitable impurities, has a worked structure as cold-rolled, and has an electric conductivity of 40 to 60% IACS. Further, in the method for producing an alloy sheet, a cast ingot having the above components is heated without performing homogenizing annealing, thereafter, hot rolling is started in the temperature range of 450 to 550°C and is finished at≤350°C, and cold rolling is performed, so as to produce the alloy sheet. COPYRIGHT: (C)2006,JPO&NCIPI
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