| 摘要 |
PROBLEM TO BE SOLVED: To provide an Al-Zn-Mg-based aluminum alloy extruded material for bumper reinforcement, which can obtain high strength by die quenching through air cooling and has excellent SCC resistance. SOLUTION: The aluminum alloy extruded material satisfies, provided that the mass% of Mg is defined as [Mg] and the mass% of Zn is defined as [Zn], three inequalities of 5.43≤[Zn]≤6.3, [Zn]/5.38+0.15≤[Mg]≤[Zn]/5.38+0.34, and 11.68≤[Zn]+4.7[Mg]≤14, and further includes: one or two kinds selected from 0.1-0.6 mass% of Cu and 0.01-0.15 mass% of Ag; 0.005-0.05 mass% of Ti; and one or more kinds selected from 0.1-0.3 mass% of Mn, 0.05-0.2 mass% of Cr, and 0.05-0.2 mass% of Zr, with the balance of Al and inevitable impurities. COPYRIGHT: (C)2013,JPO&INPIT |
