Patent ID: 7846277
Filing Date: 2010-12-07
Classification: B21B,C22C,C22F

Abstract:
1. A method for the production of a planar, rolled semi-finished product made of aluminum alloys, wherein the aluminum alloys have the following alloy proportions in weight-%: 2≦Mg≦5; Mn≦0.5; Cr≦0.35; Si≦0.4; Fe≦0.4; Cu≦0.3; Zn≦0.3; Ti≦0.15; and others at a sum of a maximum of 0.15, individually at a maximum of 0.05, residual Al, wherein the semi-finished product is rolled off of an ingot, and during the rolling process is subjected to at least one intermediate soft annealing in a batch furnace between two cold roll passes and one final soft annealing in a batch furnace after the two cold roll passes, wherein the degree of deformation before the first intermediate soft annealing is at least 50%, the degree of deformation before the final soft annealing is not more than 30%, and the semi-finished product is stretch-formed by 0.1 to 0.5% after the final soft annealing.