Method of producing hardened aluminum alloy sheets having superi

Details Method of producing hardened aluminum alloy sheets having superi Method of producing hardened aluminum alloy sheets having superi

1990-05-15

1991-11-05

Dean, R.

Metal treatment

Compositions

Heat treating

148 127A, 148159, 148417, 148439, 420533, C21D 800, C22C 2106

Patent

active

050629018

ABSTRACT:
The present invention provides a method of producing a hardened aluminum alloy sheet comprising the steps of casting an aluminum alloy containing 4.0 to 6.0% Mg in a conventional including, homogenizing, hot rolling, cold rolling, intermediate annealing and stabilizing treatment, the improvement which comprises: the aluminum alloy is provided as an Al-Mg-Cu alloy containing, in addition to Mg, 0.05 to 0.50% Cu; and the Al-Mg-Cu alloy is subjected to a final intermediate annealing treatment comprising a heating to temperatures of 350.degree. to 500.degree. C. and rapid cooling to temperatures of 70.degree. C. or less at a cooling rate of 1.degree. C./sec or more and a finishing cold rolling with a reduction of at least 50%, followed by the stabilizing treatment, thereby providing a hardened aluminum alloy sheet having a superior corrosion resistance together with high levels of strength and formability. In the above production method, the finishing cold rolling with a reduction of at least 50% may be followed by coating and baking operations carried out under application of tension to the alloy.

REFERENCES:
patent: 4707195 (1987-11-01), Tsuchida et al.
patent: 4968356 (1990-11-01), Tanaka et al.

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