Patent ID: 7182824
Filing Date: 2007-02-27
Classification: C22C,C22F

Abstract:
1. A method of manufacturing a zinc alloy ingot, which comprises the steps of: preparing a molten zinc alloy consisting of 4–22 mass % Al, 1–7 mass % Mg, optionally one or more of 0.002–1 mass % Ti, 0.001–0.5 mass % B and 0.005–2 mass % Si, and the balance being Zn except inevitable impurities; holding said molten zinc alloy at a temperature higher by 85° C. or more than its solidification-beginning temperature for homogenization; cooling said molten zinc alloy down to a temperature within a range of 20° C. or more but less than 65° C. more than said solidification-beginning temperature; pouring said molten zinc alloy in a mold; and naturally cooling and solidifying said molten zinc alloy in the mold, while an upper part of said molten zinc alloy is being heated.