| 摘要 |
PURPOSE:To obtain the titled sheet having particularly superior formability as well as strength equivalent to that of H19 materials by carrying out solution heat treatment under specific conditions after hot and cold rollings and then final cold rolling at a prescribed draft in manufacturing a hard sheet out of an Al-Mn-Mg-type Al alloy ingot having a specific composition. CONSTITUTION:The Al alloy ingot consisting of 0.1-1% Si, 0.2-2% Mg, 0.2-2% Mn, 0.1-0.3% Cu 0.005-0.2% Zn and the balance Al is homogenized and then subjected to hot rolling and cold rolling to be formed into sheets, which are subjected, as process annealing, to solution heat treatment constituted of holding at 500-600 deg.C for 5sec-5min and successive quenching, followed by final cold rolling at 30-70% draft. |
