Appeal No. 1998-2328
Application No. 08/560,138
APPENDIX
19. A method of producing an aluminum alloy sheet product
comprising:
casting an aluminum alloy to provide a slab, said aluminum
alloy, by weight percent, consisting essentially of 0.60 to 1.1
Si, 0.40 max. Fe, 0.50 to 0.9 Cu, 0.10 to 0.45 Mn, 0.5 to 1.0
Mg, 0.10 max Cr, 0.15 max Zn;
homogenizing the slab;
hot rolling the slab in a hot mill to provide an
intermediate gauge product, the hot rolling being controlled so
that the temperature of the slab entering the hot mill is
between 950°F (510°C) and 1025°F (552°C) and the temperature of
the intermediate gauge product exiting the hot rolling step does
not exceed 575°F (302°C);
cold rolling the intermediate gauge product to a final
gauge product, said cold rolling including one of: (a) annealing
said intermediate gauge product between 700°F and 900°F (371°C
and 482°C) followed by cold rolling said annealed intermediate
gauge product to the final gauge product; and (b) cold rolling
said intermediate gauge product to provide a second intermediate
gauge sheet product, annealing said second intermediate gauge
product between 600°F and 1000°F (316°C and 538°C), and cold
rolling said annealed second intermediate gauge product to the
final gauge product; and
solution heat treating and quenching the final gauge
product to provide an aluminum alloy sheet product;
the process enabling the product to be subsequently strained
while minimizing formation of ridging lines on a surface
thereof.
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