| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy sheet which has high electric conductivity, can be subjected to bolting and calking by intensive stress at the initial stage, the lowering of strength of which is small even if left at a temperature of 120 to 160°C for a long time and stress relaxation of which is small in the temperature range of 120 to 160°C, and to provide its production method. SOLUTION: The aluminum alloy sheet for calking has a composition comprising 0.03 to 0.5% Cu, 0.005 to 0.3% Mn and 0.05 to 1.0% Fe, and the balance Al with inevitable impurities, and in which the content of Si is regulated to≤0.2% among the inevitable impurities. The aluminum alloy sheet has a crystal grain size of 35 to 300μm, and the average film thickness of an oxide film formed on the surface is≤10 nm. The aluminum alloy sheet has an electric conductivity of≥58% IACS, and a stress relaxation ratio of≤60%. The aluminum alloy sheet is produced by performing cold rolling at a rolling ratio of 30 to 80%, thereafter performing heating to≥300°C at a heating rate of≥20°C/hr, and subsequently performing cooling at≥20°C/hr. COPYRIGHT: (C)2005,JPO&NCIPI
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