To provide a process for manufacturing an Al alloy containing little Ca, which inexpensively and reliably reduces Ca, and to provide an Al alloy base metal applicable to the manufacturing process.
The process manufactures the Al alloy containing as little Ca as 0.002 mass% or less. The process comprises a base-metal-melting step S1 for melting a base metal of an Al alloy which contains 0.003 mass% or more Ca together with 1 mass% or less Mg, a molten-metal-holding step S2 for reducing a Ca content to 0.002 mass% or less by exposing the surface of the molten metal obtained in the base-metal-melting step S1 to atmospheric air for 20 minutes or longer, and a pouring step S3 of pouring the molten metal into a mold having a desired shape. The base metal of the Al alloy to be used preferably contains 0.2 mass% or less Mg. After the molten-metal-holding step S2, a Mg addition step of adding a desired amount of Mg to the molten metal is preferably performed.
HOJO HIROSHI
SUGIMOTO YOSHIHIKO
UEDA ISAMU
IWABORI HIROAKI
Tamiwa Iwakura