Highly-formed 5-series aluminum alloy plate strip for automobile air suspension part and preparation method of highly-formed 5-series aluminum alloy plate strip

The invention discloses a highly-formed 5-series aluminum alloy plate strip for air suspension and a preparation method of the highly-formed 5-series aluminum alloy plate strip. The grain size and orientation distribution characteristics of the aluminum alloy plate strip in the thickness direction are as follows: the proportion of small-angle grain boundaries with the grain boundary orientation difference range of 2-5 degrees is less than 2%, the proportion of large-angle grain boundaries with the grain boundary orientation difference range of 5-180 degrees is greater than or equal to 85%, the proportion of rolling textures is less than 15%, and the proportion of typical orientation total textures is less than 50%. The preparation method comprises the following steps: (1) smelting and semi-continuous casting; (2) heating the cast ingot; (3) hot rolling; (4) cold rolling; and (5) finished product annealing. According to the scheme, the yield of the 5-series aluminum alloy plate strip for air suspension is impr