Aluminium alloy strip and manufacture method thereof

The invention provides an aluminium alloy strip and a manufacture method thereof. The manufacture method of the aluminium alloy strip comprises the following steps: (1) soaking a cast ingot; (2) hot rolling the soaked cast ingot; and (3) cold rolling and annealing the hot-rolled cast ingot, wherein the cast ingot comprises the followings: equal to or less than 0.10 wt% of Si, equal to or less than 0.2 wt% of Fe, 0.18-0.25 wt% of Mn, 5.0-6.5 wt% of Mg and the balance of Al and unavoidable impurities. The aluminium alloy strip prepared through the manufacture method disclosed by the invention is high in tensile strength and yield strength and is excellent in overall performance. 本发明提供种铝合金带材及其制造方法。本发明的铝合金带材的制造方法，包括如下步骤：1)对铸锭进行均热处理；2)对经均热处理的铸锭进行热轧；3)对经热轧的铸锭进行冷轧和退火；其中，所述铸锭的组成为：Si：≤0.10wt％，Fe：≤0.2wt％，Mn：0.18-0.25wt％，Mg：5.0-6.5wt％，余量为Al及不可避免的杂质。利用本发明制造方法制造的铝合金带材抗拉强度和屈服强度高，综合性能优异。