Metal treatment – Stock – Aluminum base
Patent
1994-04-14
1996-04-30
Simmons, David A.
Metal treatment
Stock
Aluminum base
148537, 148417, 148439, 360106, C22C 2106
Patent
active
055121110
ABSTRACT:
An aluminum alloy material for the shutter of flat recording medium cassettes. The shutter is light in weight and smoothly slidable, has good corrosion resistance and durability, and protects itself against staining with fingerprints. The aluminum alloy contains 3.0-6.0% Mg (by weight) and one or more than one optional elements of Mn.ltoreq.1.5%, Cr.ltoreq.0.3%, Cu.ltoreq.0.5%, and Ti.ltoreq.0.1%, with the balance being aluminum and inevitable impurities, and has a tensile strength of 310-410 MPa and a yield strength of 250-370 MPa. The aluminum alloy material is formed from a rolled sheet of said aluminum alloy by coating the sheet with a plastic film not thicker than 5 .mu.m. The rolled sheet undergoes intermediate annealing at higher than the recrystallization temperature, final cold rolling, and stabilizing heat treatment.
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Hanaki Kazuhiro
Kimura Taizo
Miyazaki Hiroki
Tahara Shozo
Koehler Robert R.
Simmons David A.
Sumitomo Light Metal Industries Ltd.
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