| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method for an aluminium alloy substrate for a magnetic disk, in which flatness is reduced and which is suitable for promoting high recording density of a magnetic disk and to provide the aluminium alloy substrate for the magnetic disk. SOLUTION: In a method for manufacturing an aluminium alloy substrate for magnetic disk comprising a punching process manufacturing an aluminium alloy substrate by punching an aluminium alloy plate in a doughnut shape, and a press annealing process for performing annealing this aluminium alloy substrate with a load applied on it, the punched aluminium alloy substrate has plate thickness area sum of the prescribed value or less. COPYRIGHT: (C)2004,JPO
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