Pechiney Rhenalu

Martin Peter Schmidt

Philippe Jarry

Jean-Luc Hoffmann

Jean-Marc Legresy

Herve Gehanno

Pierre Yves Menet

Process for forming an aluminum alloy strip, including the steps of a) obtaining an aluminum alloy consisting essentially of, by weight, 0.5 to 13% Si, 0 to 2% Mg, 0 to 2% Cu, 0 to 1% Mn, 0 to 2% Fe, other elements less than 0.5% each and less than 2% total, and remainder Al; and b) continuously casting the aluminum alloy between twin cooled rolls having a force applied thereto, to obtain a cast strip of thickness between 1.5 and 5 mm, and optionally cold rolling the cast strip. The force applied to the rolls is maintained below an amount represented by a straight line between a point A and a point B on a graph of specific applied force (y-axis) vs. cast width (x-axis), where point A is (1.5 mm, 750 tons/meter at cast width) and point B is (5 mm, 500 tons/meter of cast width).

Method for making thin, high-strength, highly formable aluminium alloy strips

The invention relates to a rolled or extruded AlMgMn aluminum alloy product for welded mechanical construction with the composition (% by weight): 3.0&lt;Mg&lt;65, 0.2&lt;Mn&lt;1.0, Fe&lt;0.8, 0.05&lt;Si&lt;0.6, Zn&lt;1.3, possibly Cr&lt;0.15 and/or one or more of the elements Cu, Ti, Ag, Zr, V at a content of&lt;0.30 each, other elements and inevitable impurities &lt;0.05 each and &lt;0.15 in total, in which the number of Mg.sub.2 Si particles between 0.5 .mu.m and 5 .mu.m, in size is between 150 and 2,000 per mm.sup.2, and preferably between 300 and 1,500 per mm.sup.2. The products according to the invention have good corrosion resistance and are used for structural applications such as for example, boats, offshore structures or industrial vehicles.

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La Murette, France

Martin Peter Schmidt