| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an aluminum alloy sheet for a cap which controls variation among lots and in a lot and has small difference between tensile strength and yield strength and high rigidity. <P>SOLUTION: The aluminum alloy sheet for a cap has a composition containing, in mass%, 1.5-1.8% of Mg, 0. 20% or less of Mn, 0.20% or less of Si, 0.30% or less of Fe, 0.02% or less of Cu, 0.02% or less of Zn, 0.02% or less of Cr, and 0.02% or less of Ti, with the balance comprising Al and unavoidable impurities, and has a sheet thickness of 0.200-0.260 mm, tensile strength of 205-225 MPa, yield strength of 170-200 MPa, and elongation of 6-12% in terms of mechanical properties. The standard deviation σ of the tensile strength in a lot is small, such as 3 MPa or less, and a ratio of the tensile strength to the yield strength in the mechanical properties is 0.8 or more, thereby providing the aluminum alloy sheet for a cap with small variation. <P>COPYRIGHT: (C)2013,JPO&INPIT |
