Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1992-03-26
1993-08-31
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148697, 148700, 148702, 148415, 148417, 148439, 148440, C22F 104
Patent
active
052405222
ABSTRACT:
The present invention provides a method of producing a hardened aluminum alloy sheet having superior thermal stability, the method comprising the steps of: homogenizing an ingot of an aluminum alloy consisting essentially of, in weight percentage, 3.0 to 6.0% Mg and 0.4 to 0.8% Mn, with the balance being Al and incidental impurities; hot rolling the homogenized ingot to a sheet; cold rolling the hot-rolled sheet at a rolling reduction of at least 20%; intermediate heat treating the cold-rolled sheet at 200.degree. to 250.degree. C. for one hour or more; and final cold rolling the intermediate heat-treated sheet at a reduction of at least 50%. In this process, the aluminum ingot may further contain from 0.05 to 0.4% Cu with or without 0.05 to 0.5% Si, 0.1 to 0.5% Fe, 0.01 to 0.05% Ti and 0.0001 to 0.0010% B. Further, the above homogenizing and hot rolling steps may be replaced by the steps of homogenizing, hot rolling to a sheet thickness of 2 to 6 mm, cold rolling and annealing for recrystallization.
REFERENCES:
patent: 3560269 (1971-02-01), Anderson et al.
patent: 4284437 (1981-08-01), Baba et al.
patent: 4526625 (1985-07-01), Merchant et al.
patent: 5062901 (1991-11-01), Tanaka et al.
Thermal Stability of Commercial Pure Aluminum and AlMg4.5Mn, B. Grzemba et al, Aluminum vol. 65, p. 184 (1989).
Tanaka Hiroki
Tsuchida Shin
Dean R.
Koehler Robert R.
Sumitomo Light Metal Industries Ltd.
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