Importance

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Abstract

Provided is an aluminum alloy forging material having an alloy composition including Cu: 0.30 mass % to 1.0 mass %, Mg: 0.80 mass % to 1.8 mass %, Si: 0.90 mass % to 1.9 mass %, Mn: 0.30 mass % to 1.2 mass %, Fe: 0.20 mass % to 0.65 mass %, Zn: 0.25 mass % or less, Cr: 0.050 mass % to 0.30 mass %, Ti: 0.01 mass % to 0.1 mass %, B: 0.0010 mass % to 0.030 mass %, and Zr: 0.0010 mass % to 0.050 mass %, and having a ratio Fe/Mn of less than 1.4, and with the remainder being made up of Al and unavoidable impurities, wherein an average crystal particle size of an alloy structure after forging is 50 μm to 120 μm, and an average crystal particle size of an AlFeSi(Mn)-based compound present at crystal grain boundaries is 3.0 μm or less.

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First Claim