Metal treatment – Process of modifying or maintaining internal physical... – With casting or solidifying from melt
Patent
1994-05-04
1996-05-14
Simmons, David A.
Metal treatment
Process of modifying or maintaining internal physical...
With casting or solidifying from melt
148692, 148695, 148696, 148439, 148440, 420550, C22F 104
Patent
active
055163742
ABSTRACT:
A method for manufacturing an aluminum alloy sheet for use in a body panel material, comprising: (a) casting a melted aluminum alloy containing Al, Mg, Fe, Mn, Cr, Ti and Zr, having a Mg content of 4 to 10 weight %, and having contents of Fe, Mn, Cr, Ti and Zr which are determined by a value f satisfying the following equation (I), and the balance being Al: 0.4 wt %.ltoreq.f.ltoreq.1.5 wt % (I), wherein, f=(Fe)+1.1 (Mn)+1.1 (Cr)+3 (Ti)+3 (Zr), wherein (Fe), (Mn), (Cr), (Ti), and (Zr) respectively represent the percentage content by weight of Fe, Mn, Cr, Ti and Zr, to form an ingot; (b) hot rolling the ingot to obtain a hot rolled sheet; (c) cold rolling the hot rolled sheet at a cold reduction R satisfying the following equation (II): -log(f-0.2)+8.ltoreq.R.ltoreq.-60 log (f-0.2)+50 (II) to obtain a cold rolled sheet; (d) subjecting the cold rolled sheet to a final annealing treatment including raising the temperature of the rolled sheet to 450.degree. to 550.degree. C. at a rate of 100.degree. C./minute or more, and maintaining the attained temperature for 300 seconds or less; and (e) cooling the annealed rolled sheet at a cooling rate of 100.degree. C./minute or more to obtain an aluminum alloy sheet having a grain size of 20 and 80 .mu.m.
REFERENCES:
patent: 5181969 (1993-01-01), Komatsubara et al.
Patent Abstracts of Japan, vol. 16, No. 431 (C-0983) 9 Sep. 1992 of JP-A-04 147 936 (Kobe Steel Ltd.) 21 May 1992.
Database WPI, Section Ch, Week 9227, Derwent Publications, Ltd., London, GB, Class M26, AN 92-223143 of JP-A-4 147 936 (Kobe Steel Ltd) 21 May 1992.
Database WPI, Section Ch, Week 9347, Derwent Publications, Ltd., London, GB, Class M26, AN 93-374932 of JP-A-5 279 821 (Furukawa Aluminum KK) 26 Oct. 1993.
Database WPI, Section Ch, Week 9405, Derwent Publications, Ltd., London, GB, Class M26, AN 94-040173 of JP-A-5 345 962 Furukawa Aluminum KK) 27 Dec. 1993.
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Bekki Yoichiro
Habu Tetsushi
Hayashi Minoru
Koehler Robert R.
Simmons David A.
The Furukawa Electric Co. Ltd.
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