Method for producing fine-grained, high strength aluminum...

Details Method for producing fine-grained, high strength aluminum... Method for producing fine-grained, high strength aluminum...

C - Chemistry, Metallurgy

22

F

148/35.4

C22F 1/053 (2006.01)

Patent

CA 1191433

ABSTRACT OF THE DISCLOSURE An aluminum alloy material having a high strength, small grain size, good resistance to stress corrosion cracking and very high degree of workability is produced from an aluminum base alloy consisting essentially of 5.1 to 8.1 wt.% Zn, 1.8 to 3.4 wt.% Mg, 1.2 to 2.6 wt.% Cu, up to 0.2 wt.% Ti and at least one of 0.18 to 0.35 wt.% Cr and 0.05 to 0.25 wt.% Zr, the balance being aluminum and impurities by an improved production method described in detail in the disclosure. The improved method is particularly characterized by special annealing step in a continuous annealing furnace under the application of a tension not exceeding 2 kg/mm2 to a coiled alloy sheet to be annealed, the annealing including rapid heating the coiled alloy sheet to a temperature of 400 to 500°C at a heating rate exceeding 50°C/min.

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