C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/79, 148/35.4
C22C 21/00 (2006.01) C22F 1/04 (2006.01)
Patent
CA 2015667
Abstract Production of a thin aluminum alloy strip containing iron, manganese and silicon by hot rolling and cold rolling with a subsequent final annealing, includes the steps of (a) producing a bar by a continuous casting process, from 0.7 - 1.15% by weight Fe; 0.5 - 200% by weight Mn; and less than 0.6% by weight Si; as well as impurities, none of which exceeds 0.03% by weight, the remainder of the bar being aluminum; (b) homogenizing the bar for 2 to 20 hours at a temperature from 620 to 480 C, after which the bar is (c) hot rolled in a usual manner to a final thickness of 4 mm; then (d) cold rolled without intermediate annealing to a final thickness of 40 to 250 microns; and (e) annealing the cold-rolled strip for 1 to 6 hours at a temperature of 250 to 400 C. The alloy produced has a sub-grain structure, with an average 10 grain diameter of 0.5 to 5 microns, the subgrains constituting at least 50% of the total structure. An alternative embodiment includes the addition-of at least one of the following elements: Mg: 0.1 - 0.8% by weight, Cu: 0.1 - 0.3% by weight, and Zr: 0.01 - 0.20% by weight. - 11 -
Hasenclever Jochen
Robic
Vereinigte Aluminium-Werke Aktiengesellschaft
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