Metal treatment – Process of modifying or maintaining internal physical... – With casting or solidifying from melt
Patent
1994-05-20
1996-01-02
Simmons, David A.
Metal treatment
Process of modifying or maintaining internal physical...
With casting or solidifying from melt
148552, 148691, 148692, 148693, 148696, 148697, 148698, 148415, 148437, C22F 104
Patent
active
054804981
ABSTRACT:
A method of producing aluminum alloy sheet product includes casting a slab, homogenizing the cast slab, and hot rolling the homogenized slab to provide an intermediate gauge product. The temperature and other operating parameters of the hot rolling process are controlled so that the temperature of the intermediate gauge product exiting the hot rolling step is between about 500.degree. F. and 650.degree. F. Preferably, the temperature does not exceed 575.degree. F. The intermediate gauge product is then subjected to a cold reduction of 45% to 70%, annealed, and cold rolled to final gauge. The combination of controlling the hot rolling to provide a desired exit temperature of the intermediate gauge product and annealing prior to cold rolling to final gauge minimizes or eliminates the appearance of ridging or roping line defects in the aluminum sheet product when subjected to further straining in a forming or stamping operation. An improved aluminum alloy sheet product is produced having a superior surface finish for use in automotive components such as hoods or deck lids.
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Beaudoin Armand J.
Bryant J. Daniel
Janousek Alan J.
Kamat Rajeev G.
Oliver H. Edwin
Biddison Alan M.
Koehler Robert R.
Reynolds Metals Company
Simmons David A.
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