Method of producing hardened aluminum alloy forming sheet having

Details Method of producing hardened aluminum alloy forming sheet having Method of producing hardened aluminum alloy forming sheet having

1990-02-20

1990-11-06

Roy, Upendra

Metal treatment

Compositions

Heat treating

148 127A, 420533, 420535, C22C 2100

Patent

active

049683560

ABSTRACT:
A method of producing a hardened aluminum alloy forming sheet having a high strength and a superior corrosion resistance, the method comprising the steps of (1) providing a melt having a composition consisting of, in weight percentage, 4.0 to 6.0% Mg, 0.05 to 0.50% Cu, 0.10 to 1.0% Mn, 0.01 to 0.05% Ti and the balance being aluminum and impurities; (2) cooling to solidify the melt; (3) hot rolling and cold rolling to form a rolled sheet; and (4) heat treating the rolled sheet by heating to a temperature of 150.degree. to 300.degree. C. at a heating rate of at least 5.degree. C./second, holding within five minutes at the temperature of 150.degree. to 300.degree. C. and cooling to a temperature of 70.degree. C. or less at a cooling rate of at least 30.degree. C./second. The melt may further contain 0.05 to 0.20% by weight Cr and the heat treatment of the step (4) may be carried out under tension after flattening said cold-rolled sheet by leveling at ordinary temperatures. The aluminum alloy sheet is especially suitable for use in manufacturing easy open can ends.

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