| 摘要 |
A composition and method whereby aluminium scrap, including consumer scrap, is recycled into aluminium sheet and aluminium containers. Aluminium scrap is heated to form a melt, which requires a minimum amount of adjustment to arrive at the present alloy composition. The melt is adjusted to form a composition consisting essentially of silicon 0.1-1.0%; iron 0.1-0.9%; manganese 0.4-1.0%; magnesium 1.3-2.5%; copper 0.05-0.4%; and titanium 0-0.2%, the balance being essentially aluminium. The total concentration of Mg+Mn is 2-3.3%, and the Mg:Mn ratio lies between 1.4:1 and 4.4:1. The composition is then cast and fabricated into sheet having strength and formability properties making it suitable for container manufacture. Sheet fabrication according to the present invention comprises direct chill casting, scalping, preheating, hot breakdown rolling, continuous hot rolling, annealing, cold rolling and shearing. Container manufacture comprises drawn-and-ironed can body manufacture and easy-opening end manufacture. |
