Title:
CAN LID MATERIAL EXCELLENT IN BENDABILITY AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3523692
Kind Code:
B2
Abstract:
PURPOSE: To provide superior strength and bendability, even in the case of low temp. baking treatment by using water paint, by specifying a composition and controlling the state of distribution of second-phase compounds.
CONSTITUTION: A composition, which contains, by weight ratio, 2.8-4.0% Mg, 0.5-1.0% Mn, 0.2-0.5% Fe, 0.005-0.2% Cu, and 0.01-0.1% Ti and satisfies Mn+Fe≤1.3% and has the balance Al with inevitable impurities and in which Si content is limited to ≤0.4%, is provided. Further, in an alloy sheet of this composition, the second-phase compounds distributed in the surface are regulated so that those of ≤2μm grain size are 100pieces/m2 and those of 6-15μm grain size are 250pieces/m2, and also proof stress after baking finish is regulated to ≥300MPa. This alloy sheet can be produced by subjecting an ingot to homogenizing treatment at 450-550°C for 1-20hr, to hot rolling, and then to cold rolling at ≥60% draft, and further, baking finish treatment is done by performing baking at 200-250°C for ≤2min after surface preparation of alkali etching and chemical conversion treatment.
Inventors:
Tanaka, Hiroki
Hanaki, Kazuhiro
Moriyama, Tsutomu
Narita, Midori
Tsuchida, Makoto
Hanaki, Kazuhiro
Moriyama, Tsutomu
Narita, Midori
Tsuchida, Makoto
Application Number:
JP22103494A
Publication Date:
April 26, 2004
Filing Date:
August 23, 1994
Export Citation:
Assignee:
SUMITOMO LIGHT METAL IND LTD
International Classes:
B32B15/082; B05D7/14; B32B15/08; C22C21/06; C22F1/00; C22F1/04; C22F1/047; C23C22/00; (IPC1-7): C22C21/06; B05D7/14; C22F1/04; C22F1/047; C23C22/00
Attorney, Agent or Firm:
福田 保夫