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.
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Inventors:
KITAWAKI KOTARO (JP)
MURATA TAKUYA (JP)
HIBINO AKIRA (JP)
KITAMURA NAOKI (JP)
OTA HIROKI (JP)
FUJII YASUO (JP)
TAKAHASHI HIDEKI (JP)
MORI TAKASHI (JP)
MURATA TAKUYA (JP)
HIBINO AKIRA (JP)
KITAMURA NAOKI (JP)
OTA HIROKI (JP)
FUJII YASUO (JP)
TAKAHASHI HIDEKI (JP)
MORI TAKASHI (JP)
Application Number:
PCT/JP2017/027483
Publication Date:
February 08, 2018
Filing Date:
July 28, 2017
Export Citation:
Assignee:
UACJ CORP (JP)
FURUKAWA ELECTRIC CO LTD (JP)
FURUKAWA ELECTRIC CO LTD (JP)
International Classes:
C22C21/06; B21B1/00; C22C1/02; G11B5/73; G11B5/82; G11B5/84; C22F1/00; C22F1/047
Foreign References:
| JP2016135914A | 2016-07-28 | |||
| JP2013023737A | 2013-02-04 | |||
| JP2013112884A | 2013-06-10 | |||
| JP2015093995A | 2015-05-18 | |||
| JP2009079286A | 2009-04-16 |
Attorney, Agent or Firm:
EINSEL Felix-Reinhard et al. (JP)
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