High strength aluminum alloy extruded material with excellent corrosion resistance and good hardenability, and method for producing the same

摘要

An object of the present invention is to provide a high-strength aluminum alloy extruded material having high strength obtained by air cooling immediately after extrusion and having excellent stress corrosion cracking resistance, and a method for producing the same. The high-strength aluminum alloy extrudates having excellent corrosion resistance and good quenching characteristics according to the present invention are all mass% below, Zn: 6.0-8.0%, Mg: 1.50-2.70%, Cu : 0.20-1.50%, Ti: 0.005-0.05%, Zr: 0.10-0.25%, Mn: 0.3% or less, Cr: 0.05% or less , Sr: 0.25% or less and Zr + Mn + Cr + Sr = 0.10−0.50%, and the balance is made of Al and inevitable impurities.