| 摘要 |
Disclosed is a method for producing an aluminum alloy thick plate, which is characterized by sequentially performing, in the following order, a melting step (S1) wherein an aluminum alloy consisting of a predetermined amount of Mg, at least one of Si, Fe, Cu, Mn, Cr, Zn, Ti and Zr, and the balance of Al and unavoidable impurities; a hydrogen gas removing step (S2) wherein a hydrogen gas is removed from the melted aluminum alloy; a filtering step (S3) wherein inclusions are removed from the aluminum alloy from which a hydrogen gas is removed; a casting step (S4) wherein an ingot is produced by casting the aluminum alloy from which inclusions are removed; a slicing step (S5) wherein an aluminum alloy thick plate having a predetermined thickness is produced by slicing the ingot; and a heat treatment step (S6) wherein the aluminum alloy thick plate having a predetermined thickness is heat-treated by being maintained at a temperature not less than 400°C but less than the melting point for 1 or more hours.
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