Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1994-01-27
1995-08-15
Kastler, Scott
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148418, 148439, 148690, 420535, 420532, C22C 2108
Patent
active
054415829
ABSTRACT:
Disclosed is a method manufacturing an aluminum alloy sheet comprising preparing an aluminum alloy ingot essentially consisting of 1.5 to 3.5% by weight of Mg, 0.3% to 1.0% by weight of Cu, 0.05 to 0.35% by weight of Si, 0.03 to 0.5% by weight of Fe, 0.005 to 0.15% by weight of Ti, 0.0002 to 0.05% by weight of B and a balance of Al, in which the ratio of Mg/Cu is in the range of 2 to 7, homogenizing the ingot in one step or in multiple steps, performed at a temperature within the range of 400.degree. to 580.degree. C., preparing an alloy sheet having a desired sheet thickness by subjecting the ingot to a hot rolling and a cold rolling, subjecting the alloy sheet to a heat treatment including heating the sheet up to a range of 500.degree. to 580.degree. C. at a heating rate of 3.degree. C./second or more, keeping it at the temperature reached for 0 to 60 seconds, and cooling at a cooling rate of 2.degree. C./second or more, subjecting the alloy sheet to a preliminary aging treatment performed at a temperature within the range of 45.degree. to 100.degree. C. for 2 to 48 hours after keeping at room temperature or immediately after the heat treatment, and subjecting the alloy sheet to a restoring treatment performed at a temperature within the range of 180.degree. to 300.degree. C. for 3 to 60 seconds. Thus, a natural aging-retardated aluminum alloy sheet exhibiting excellent formability and excellent bake hardenability is obtained.
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Fujita Takeshi
Hasegawa Kohei
Mitao Shinji
Suga Masataka
Kastler Scott
NKK Corporation
Vincent Sean
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