Stock material or miscellaneous articles – All metal or with adjacent metals – Workpiece with longitudinal passageway or stopweld material
Patent
1991-01-04
1992-08-25
Zimmerman, John
Stock material or miscellaneous articles
All metal or with adjacent metals
Workpiece with longitudinal passageway or stopweld material
148437, 148689, 2989008, C22F 104, F02M 3510
Patent
active
051418207
ABSTRACT:
An aluminum pipe according to the present invention is used in forming a plurality of bulged portions on the peripheral wall thereof. At the same time by bulging has been so refined as to exhibit an elongation of at least 40% and a recrystallization texture of up to 60 .mu.m in grain size during bulging. The aluminum pipe to be bulged is produced by a process characterized by drawing an extruded aluminum pipe at a cold working ratio of at least 40%, and thereafter annealing the drawn pipe at a temperature of 350.degree. to 420.degree. C., whereby the pipe is refined to exhibit the specified elongation and recrystallization texture.
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Metals Handbook, 9th Ed., vol. 4, "Heat Treating", American Society for Metals, Metals Park, Ohio, 1981, pp. 707-710.
Akiyoshi Hitoshi
Sugiyama Kazuo
Sukimoto Minobu
Taguchi Seijiro
Watanabe Isao
Showa Aluminum Corporation
Zimmerman John
LandOfFree
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