Method for producing low Ca-containing Al alloy and ingot for producing low Ca-containing Al alloy

摘要

PROBLEM TO BE SOLVED: 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.;SOLUTION: 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.;COPYRIGHT: (C)2005,JPO&NCIPI