Title:
INVAR ALLOY STEEL SHEET MATERIAL FOR SHADOW MASK, METHOD OF PRODUCTION THEREOF, SHADOW MASK, AND COLOR PICTURE TUBE
Document Type and Number:
WIPO Patent Application WO/1998/051833
Kind Code:
A1
Abstract:
An invar alloy steel sheet for a shadow mask having improved etching characteristics, an economical method of production thereof, a shadow mask made from the invar alloy steel sheet, and a color picture tube incorporating the shadow mask. The production method is characterized by hot working a slab of an alloy consisting of 33 to 40 wt.% of Ni and the balance of Fe, applying primary cold rolling at a rolling reduction of not higher than 80 %, annealing the sheet at a temperature not lower than 550 �C, and applying further secondary cold rolling at a rolling reduction of not higher than 50 %, so that a planar integration of the {100} plane of the rolled surface is 60 to 80 %.
Inventors:
IDE TSUNEYUKI (JP)
OKAYAMA HIRONAO (JP)
IKENAGA HIROAKI (JP)
SHIGEMASA SUSUMU (JP)
TAHARA YASUO (JP)
SATO TAIZO (JP)
IKEDA AKIRA (JP)
OKAYAMA HIRONAO (JP)
IKENAGA HIROAKI (JP)
SHIGEMASA SUSUMU (JP)
TAHARA YASUO (JP)
SATO TAIZO (JP)
IKEDA AKIRA (JP)
Application Number:
PCT/JP1998/002051
Publication Date:
November 19, 1998
Filing Date:
May 08, 1998
Export Citation:
Assignee:
TOYO KOHAN CO LTD (JP)
IDE TSUNEYUKI (JP)
OKAYAMA HIRONAO (JP)
IKENAGA HIROAKI (JP)
SHIGEMASA SUSUMU (JP)
TAHARA YASUO (JP)
SATO TAIZO (JP)
IKEDA AKIRA (JP)
IDE TSUNEYUKI (JP)
OKAYAMA HIRONAO (JP)
IKENAGA HIROAKI (JP)
SHIGEMASA SUSUMU (JP)
TAHARA YASUO (JP)
SATO TAIZO (JP)
IKEDA AKIRA (JP)
International Classes:
C21D8/02; C22C38/00; C22C38/04; C22C38/08; C22C38/42; H01J9/14; (IPC1-7): C22C38/08
Foreign References:
| JPS6452022A | 1989-02-28 | |||
| JPH06158229A | 1994-06-07 |
Attorney, Agent or Firm:
Ohta, Akio (4-3, Kasumigaseki 1-chom, Chiyoda-ku Tokyo, JP)
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