| 摘要 |
PURPOSE:To obtain a high strength Al-Mg-Si alloy having superior spinnability by adding specified amounts of Mg, Si, Cu and one or more among Cr, Mn, Zr, V, Ti and B to Al. CONSTITUTION:The composition of an Al alloy ingot is composed of, by weight, 0.4-1% Mg, 0.05-0.6% Si, 0.05-0.4% Cu, one or more among 0.05-0.4% Cr, 0.05-0.6% Mn, 0.05-0.2% Zr, 0.02-0.15% V, 0.005-0.5% Ti and 0.0005-0.05% B, and the balance Al with inevitable impurities. The alloy ingot is heated to 350-500 deg.C at <=40 deg.C/hr heating rate, held at the temp. for 2-24hr, and then held at 450-520 deg.C for 2-12hr before the ingot is hot rolled. By this two-step holding, the grain size is regulated to <=50mum.
|
