C - Chemistry – Metallurgy – 22 – F
Patent
C - Chemistry, Metallurgy
22
F
148/11
C22F 1/05 (2006.01) C22C 21/08 (2006.01) C22F 1/08 (2006.01)
Patent
CA 1306928
26625-77 ABSTRACT OF THE DISCLOSURE In a method for producing an aluminum alloy, for instance to make a billet or ingot for extrusion purposes, and which may consist of a structural hardening Al Mg-Si-alloy, the production comprises the following steps, casting an ingot or billet; homogenizing the billet; cooling of the homogenized billet; reheating the billet to a temperature in the alloy above the solubility temperature in the precipitated phases in the Al matrix, for instance the solubility temperature for the Mg-Si- phases in a billet made of an Al-Mg-Si-alloy; holding the billet at the temperature above the solubility temperature for the precipitated phases in the Al matrix, for instance the Mg-Si- phases in a billet made of an Al-Mg-Si-alloy, until the phases are dissolved; and quick cooling of the billet to the desired extrusion temperature to prevent new precipitation of said phases in the alloy structure, or that the billet is extruded at said solubility temperature, until the phases are dissolved. The above mentioned contributes to improve the extrudability for the billet, for instance by making it possible to increase the extrusion speed essentially.
572392
Fetherstonhaugh & Co.
Norsk Hydro A.s
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