| 摘要 |
PROBLEM TO BE SOLVED: To provide an Al-Mg-Si series alloy sheet having excellent formability and baking hardenability and suitable for the panel material of an automobile or the like. SOLUTION: This alloy sheet is the one having a compsn. contg., by weight, 0.2 to 1.0% Mg and 0.5 to 1.6% Si in such a manner that the ratio of Mg/Si satisfies <=1.2, furthermore contg. one or more kinds among <=0.3% Fe, <=0.3% Mn and <=0.3% Cr, moreover contg., at need, 0.05 to 1.2% Cu, and the balance Al with inevitable impurities, in which the dimensions of precipitates on the grain boundary measured along the boundary (boundary precipitate size) are <=2.0μm, and the mumerical density of precipitates of >=0.5μm boundary precipitate size in the grain boundary (boundary precipitate density) is <=0.3/μm<2> .
|
