| 摘要 |
<p>Disclosed is a rolled sheet material produced by conducting the cold rolling of a copper alloy comprising 0.1-1.0 mass% of Cr, 0.05-1.5 mass% of Sn and 0.05-1.5 mass% of Zn, with the remainder being Cu and unavoidable impurities. In the rolled sheet material, both of the stress relaxation ratios in a direction parallel to the rolling direction and a direction perpendicular to the rolling direction are 50% or less as measured by an insertion-type stress relaxation test at 150°C after a lapse of 1000 hours.</p> |
