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本发明是有关使用于易拉罐盖等方面的耐蚀性优良且具有高强度、高成形性的 Al-Mg 系合金硬质板的制造方法。将由4.7%Mg、0.12%Cu、0.46%Mn、0.15%Si、0.23%Fe、0.02%Ti、其余为 Al 及杂质组成的铝合金铸锭在500℃下进行8小时的均质化处理后,在轧制开始温度480℃下进行热轧,进而冷轧至厚为0.5～1.5mm 的薄板,然后在以下条件下进行中间退火:升温速度2℃/s,温度450℃,保持时间30s,冷却速度40～100℃/s,冷却温度60℃。最后进行精冷轧(相对
The present invention relates to a method for producing an Al-Mg-based alloy hard plate that is excellent in corrosion resistance and has high strength and high formability when used for a can lid or the like. An aluminum alloy ingot composed of 4.7% Mg, 0.12% Cu, 0.46% Mn, 0.15% Si, 0.23% Fe, 0.02% Ti and the balance of Al and impurities was homogenized at 500 ° C for 8 hours, Hot rolled at a rolling start temperature of 480 ° C and further cold rolled to a thin slab of 0.5 to 1.5 mm, and then subjected to intermediate annealing at a temperature rising rate of 2 ° C / s, a temperature of 450 ° C, a holding time of 30 s, cooling Speed 40 ~ 100 ℃ / s, cooling temperature 60 ℃. The final fine cold rolling (relative