The invention discloses an aluminum
alloy sheet material for vehicles and a preparation method thereof. The aluminum
alloy sheet material comprises 4.5-5.5wt% of Mg, 0.15-0.35wt% of Mn, 0.10-0.30wt% of Fe, less than or equal to 0.15wt% of Si, less than or equal to 0.10wt% of Ti, less than or equal to 0.10wt% of Cu, less than or equal to 0.10wt% of Zn, less than or equal to 0.10wt% of Cr and the balance Al and unavoidable impurities. The preparation method orderly comprises material blending, melting
casting, uniformization, hot rolling deformation, primary cold rolling deformation, intermediate annealing, secondary cold rolling deformation and complete annealing. Through the design and optimization of
alloy components and preparation processes, the 5XXX-series aluminum alloy
sheet material with high
formability and a low cost is prepared by the existing conventional plate and strip
production line.