Metal treatment – Stock – Aluminum base
Patent
1990-09-05
1992-04-14
Dean, R.
Metal treatment
Stock
Aluminum base
148 2, 148 115A, 148437, 148440, 206139, 420533, C22C 2106, C21D 800
Patent
active
051044650
ABSTRACT:
An aluminum sheet having novel properties is provided. The strip stock is suitable for the fabrication of both container ends and container bodies in thinner gauges than are typically employed, has low earing characteristics and may be derived from recycled aluminum scrap. An alloy particularly suited to the fabrication of the aluminum sheet preferably has a magnesium concentration of from about 2 to about 2.8 weight percent and a manganese concentration of from about 0.9 to about 1.6 weight percent. A process particularly suited to the fabrication of the aluminum sheet preferably includes continuous chill block casting the alloy melt into a strip, hot rolling the strip to a first thickness, annealing the hot rolled strip and then cold rolling the annealed strip to a final thickness. Cold rolling preferably includes two stages with an intermediate anneal step between the two stages. The process increases tensile and yield strength while decreasing earing percentage, even in very thin gauges, such as 0.010 inches.
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Marsh Ivan M.
McAuliffe Donald C.
Dean R.
Golden Aluminum Company
Koehler Robert R.
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