Production method for aluminum alloy ingot, continuously cast aluminum alloy rod, and forged aluminum alloy product

1:

• A method for producing an aluminum alloy ingot containing additive elements of Cu in a range of 0.30 mass % or more and 1.0 mass % or less, Mg in a range of 0.80 mass % or more and 1.8 mass % or less, Si in a range of 0.90 mass % or more and 1.9 mass % or less, Mn in a range of 0.30 mass % or more and 1.2 mass % or less, Fe in a range of 0.20 mass % or more and 0.65 mass % or less, Zn in a range of 0.25 mass % or less, Cr in a range of 0.050 mass % or more and 0.30 mass % or less, Ti in a range of 0.01 mass % or more and 0.1 mass % or less, B in a range of 0.0010 mass % or more and 0.030 mass % or less, and Zr in a range of 0.0010 mass % or more and 0.050 mass % or less, with the remainder being made up of Al and unavoidable impurities, the method comprising:
• a primary melting step in which, when raw materials including aluminum alloy scraps and aluminum base metals with a Si content of 0.60 mass % or more and 0.90 mass % or less and the contents of the additive elements within the same formulation ranges as those of the aluminum alloy ingot are added, the aluminum alloy scraps and the aluminum base metals are added in order of increasing melting point and melted to obtain a first molten metal;
• and
• a secondary melting step in which metallic Si or a Si-containing alloy is added to the first molten metal obtained in the primary melting step or a molten metal obtained by melting an ingot obtained by solidifying the first molten metal, and the Si content is adjusted to be within a range of 0.90 mass % or more and 1.9% mass % or less.