PROBLEM TO BE SOLVED: To provide an Al-Zn-Mg based weldable high strength aluminum material for forging having excellent stress corrosion cracking resistance, and, particularly, even in a state after welding, having excellent stress corrosion cracking resistance.;SOLUTION: The aluminum alloy for forging has a composition comprising 2.0 to 3.9% Zn and 0.1 to 3.5% Mg in such a manner that the total content of Zn+Mg lies within the range of 4.0 to 6.0%, further comprising 0.02 to 0.20% Cu, further comprising one or more kinds selected from 0.20 to 0.70% Mn, 0.10 to 0.30% Cr, 0.05 to 0.30% Zr and 0.01 to 0.10% V in such a manner that the total content of Mn, Cr, Zr and V is ≥0.25%, and further comprising one or more kinds selected from 0.01 to 0.20% Ti, 0.001 to 0.05% B and 0.01 to 0.5% C, and the balance substantially Al. The total content of Zn+Mg is preferably controlled to the range of 4.3 to 5.5%.;COPYRIGHT: (C)2008,JPO&INPIT
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