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Title:
ALUMINUM ALLOY SHEET FOR MAGNETIC DISC SUBSTRATE, PRODUCTION METHOD THEREFOR, AND MAGNETIC DISC
Document Type and Number:
WIPO Patent Application WO/2018/025769
Kind Code:
A1
Abstract:
Provided is an aluminum alloy sheet for magnetic disc substrates, etc. for which plating surface smoothness after plating layer formation is excellent and which can be produced at low cost. This aluminum alloy sheet for magnetic disc substrates has a composition containing, in mass%, Mg: 3.0-8.0%, Cu: 0.002-0.150%, Zn: 0.05-0.60%, Fe: 0.001-0.060%, Si: 0.001-0.060%, Be: 0.00001-0.00200%, Cr: 0.200% or less, Mn: 0.500% or less and Cl: 0.00300% or less, the balance being made of Al and unavoidable impurities. The density of Cr oxides with a maximum diameter of 3-10 µm observed in the metal structure is 1 or less per single side of the disc.

Inventors:
KITAWAKI Kotaro (1-7-2 Otemachi, Chiyoda-k, Tokyo 04, 〒1000004, JP)
MURATA Takuya (1-7-2 Otemachi, Chiyoda-k, Tokyo 04, 〒1000004, JP)
HIBINO Akira (1-7-2 Otemachi, Chiyoda-k, Tokyo 04, 〒1000004, JP)
KITAMURA Naoki (1-7-2 Otemachi, Chiyoda-k, Tokyo 04, 〒1000004, JP)
OTA Hiroki (2-3, Marunouchi 2-chome, Chiyoda-k, Tokyo 22, 〒1008322, JP)
FUJII Yasuo (2-3, Marunouchi 2-chome, Chiyoda-k, Tokyo 22, 〒1008322, JP)
TAKAHASHI Hideki (2-3, Marunouchi 2-chome, Chiyoda-k, Tokyo 22, 〒1008322, JP)
MORI Takashi (2-3, Marunouchi 2-chome, Chiyoda-k, Tokyo 22, 〒1008322, JP)
Application Number:
JP2017/027483
Publication Date:
February 08, 2018
Filing Date:
July 28, 2017
Export Citation:
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Assignee:
UACJ CORPORATION (1-7-2, Otemachi Chiyoda-k, Tokyo 04, 〒1000004, JP)
FURUKAWA ELECTRIC CO., LTD. (2-3 Marunouchi 2-chome, Chiyoda-ku Tokyo, 22, 〒1008322, JP)
International Classes:
C22C21/06; B21B1/00; C22C1/02; G11B5/73; G11B5/82; G11B5/84; C22F1/00; C22F1/047
Attorney, Agent or Firm:
EINSEL Felix-Reinhard et al. (Sonderhoff & Einsel Law and Patent Office, Shin-Marunouchi Center Building 6-2, Marunouchi 1-chome, Chiyoda-k, Tokyo 05, 〒1000005, JP)
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