| 摘要 |
Disclosed is an aluminum alloy sheet for battery cases that is made of an aluminum alloy including 0.8-2.0 mass% (referred to hereinafter as %) Fe, 0.03-0.20% Si, 0-1.00% Cu, and 0.004-0.050% Ti, with Mg being restricted to 0.02% or less, Mn being restricted to 0.02% or less, and the remainder comprising Al and inevitable impurities, wherein, in a metallographic structure up to a depth of at least 5 µm in the sheet-thickness direction from the surface of the aluminum alloy sheet having a final sheet thickness, the average circle-equivalent diameter of Al-Fe-based intermetallic compounds having circle-equivalent diameters of 1.0-16.0 µm is 1.3-1.9 µm, the coefficient of variation of said circle-equivalent diameters is 0.55 or less, the average number density of said Al-Fe-based intermetallic compounds is 20-150 pieces/2500 µm2, and the coefficient of variation of said number density is 0.30 or less. Also disclosed is a method for producing said aluminum alloy sheet. Accordingly, the present invention provides: an aluminum alloy sheet for battery cases that has excellent laser weldability, formability, and corrosion resistance after long-term storage; and a method for producing said aluminum alloy sheet. |
