Patent ID: 7780802

Claim:
A process for generating an intermediate laminated product in an aluminum alloy of the Al—Zn—Mg type, said process consisting of: a) generating a plate by semi-continuous casting, the plate containing (in percentages per unit mass): Mg 0.5-2.0, Mn<1.0, Zn 3.0-9.0, Si<0.50, Fe<0.50, Cu<0.50, Ti<0.15, Zr<0.20 the remainder aluminum with inevitable impurities, in which Zn/Mn>1.7; b) subjecting said plate to homogenization or reheating to a temperature T 1 , selected so that 500° C.≦T 1 ≦(T s −20° C.), where T s is the alloy burning temperature; c) conducting an initial hot-rolling step including one or more roll runs on a hot rolling mill, an input temperature T 2 of the initial hot rolling step being selected such that (T 1 −60° C.)≦T 2 ≦(T 1 −5° C.), and the rolling process being conducted in such a way that the output temperature T 3 in such that (T 1 −150° C.)≦T 3 ≦(T 1 −30° C.) and T 3 ≦T 2 ; d) cooling a strip emerging from said initial hot-rolling step to a temperature T 4 ; e) conducting a second hot-rolling step on said strip at an input temperature T 5 , the input temperature T 5 being selected such that T 5 ≦T 4 and 200° C.≦T 5 ≦300° C., and the second hot-rolling process being conducted in such a way that the coiling temperature T6 is such that (T 5 −150° C.)≦T 6 ≦(T 5 −20° C.); f) optionally conducting at least a cold-rolling, aging treatment, and/or cutting operation; wherein the yield strength Rp0.2 of said laminated product is at least 250 MPa, the fracture strength Rm of said laminated product is at least 280 MPa, and the elongation at fracture of said laminated product is at least 8%.