Aluminum alloy for microporous hollow material which has excellent extrudability and grain boundary corrosion resistance, and method for producing same

An aluminum alloy having a chemical composition consisting, by mass %, of Fe:

• 0.05 to 0.20%, Si:
• 0.10% or less, Cu:
• 0.15 to 0.32%, Mn:
• 0.08 to 0.10%, Zr:
• 0.02 to 0.03%, Ti:
• 0.06 to 0.15%, Cr:
• 0.01 to 0.03%, V:
• more than 0 to less than 0.05%, and the balance:
• Al and unavoidable impurities;
• wherein said aluminum alloy is cast into a billet and having a gas content in the alloy billet of 0.25 cc/100 g or less, and an upper limit of the total amount of Ti and V is 0.20%.

An aluminum alloy having a chemical composition consisting, by mass %, of Fe:

• 0.05 to 0.20%, Si:
• 0.10% or less, Cu:
• 0.15 to 0.32%, Mn:
• 0.08 to 0.10%, Zr:
• 0.02 to 0.03%, Ti:
• 0.06 to 0.15%, Cr:
• 0.01 to 0.03%, and the balance:
• Al and unavoidable impurities;
• wherein said aluminum alloy is cast into a billet and having a gas content in the alloy billet of 0.25 cc/100 g or less wherein the aluminum alloy has an exfoliation corrosion of 100 μm or less.