ALUMINUM FOIL PRODUCT AND MANUFACTURING METHOD

摘要

There is claimed an aluminum alloy sheet product having a composition consisting essentially of: about 1.35-1.6 wt.% iron; about 0.3-0.6 wt.% manganese, about 0.1-0.4 (and preferably about 0.22-0.4) wt.% copper; about 0.05-0.1 wt.% titanium; about 0.01-0.02 wt.% boron; up to about: 0.2 wt.% silicon, 0.02 wt.% chromium, 0.005 wt.% magnesium and 0.05 wt.% zinc; and a balance of aluminum, incidental elements and impurities. This composition is cast to an initial thickness greater than about 3 mm (0.12 inch). The end product exhibits improved strength and surface properties through a manufacturing process which includes: heat treating at one or more temperatures above about 450.degree.C (842.degree.F), and preferably below about 500.degree.C (932.degree.F); before rolling to final gauge. When cold rolled to various thicknesses, this sheet product exhibits ultimate tensile strength values ranging from 11-15 kg/mm2 for thin and intermediate gauge products, to about 27-30 kg/mm2 (38.4-4Z.7 ksi) for the finstocks made hereby. Percent elongations vary from a minimum of 3% to greater than 10%.