Metal treatment – Process of modifying or maintaining internal physical... – With casting or solidifying from melt
Patent
1992-08-14
1993-11-30
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
With casting or solidifying from melt
148551, 148691, 148694, 148415, 148417, 148439, 148440, C22F 104
Patent
active
052661300
ABSTRACT:
A process for manufacturing an aluminum alloy material having excellent shape fixability and bake hardenability, the process comprising: conducting semicontinuous casting of an aluminum alloy comprising 0.4 to 1.7% (wt.%) Si and 0.2 to 1.4% Mg, optionally further comprising 0.05% or less Ti and 100 pm or less B and optionally further comprising at least one member selected from the group of 1.00% or less Cu, 0.50% or less Mn, 0.20% or less Cr and 0.20% or less V, with the balance consisting of Al and unavoidable impurities, subjecting the cast alloy to conventional hot rolling; conducting solution heat treatment by holding the hot-rolled alloy at a temperature of from 450 to 580.degree. C. for 10 minutes or less; conducting first-stage cooling of the alloy at a cooling rate of 200.degree. C./min or more to a quenched temperature in the range of from 60 to 250.degree. C.; and subjecting the alloy to second-stage cooling at a cooling rate selected within the zone ABCD shown in the attached FIG. 2.
Uchida Hidetoshi
Yoshida Hideo
Dean R.
Koehler Robert R.
Sumitomo Light Metal Industries Ltd.
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