| 摘要 |
PURPOSE:To obtain a low-cost Al alloy for lead frames excellent in strength, hardness, and bendability after thermal hystersis by incorporating specific percentage of Mg, Mn, Cr, Zr and V to Al. CONSTITUTION:The Al alloy consisting of, by weight, 3.0-5.5% Mg, 1 or >=2 kinds among 0.20-1.0% Mn, 0.10-0.30% Cr, 0.05-0.25% Zr and 0.05-0.20% V, and the balance Al with inevitable impurities is prepared. In this way, the Al alloy for lead frames well balanced in heat resistance, particularly in strength, hardness, and bendability, and excellent in stabilized condition and, furthermore, having superior solderability, etc., can be obtained. |
