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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 11884988 B1

PDFFull Text
Date of Patent:
Jan. 30, 2024

Filed:

Jul. 13, 2018

Base sheet for grain-oriented electrical steel sheet, grain-oriented silicon steel sheet which is used as material of base sheet for grain-oriented electrical steel sheet, method of manufacturing base sheet for grain-oriented electrical steel sheet, and method of manufacturing grain-oriented electrical steel sheet

Applicant:

Nippon Steel Corporation, Tokyo, JP;

Inventors:

Shuichi Nakamura, Tokyo, JP;

Seiki Takebayashi, Tokyo, JP;

Yoshiyuki Ushigami, Tokyo, JP;

Shinsuke Takatani, Tokyo, JP;

Hiroyasu Fujii, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Jenny R Wu

Int. Cl.
CPC ...
C21D 9/46 (2006.01); C23C 8/02 (2006.01); C21D 8/12 (2006.01); C23C 8/18 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); C21D 8/1222 (2013.01); C21D 8/1233 (2013.01); C21D 8/1288 (2013.01); C22C 38/004 (2013.01); C22C 38/02 (2013.01); C23C 8/02 (2013.01); C23C 8/18 (2013.01); C21D 2201/05 (2013.01);
Abstract

In a base sheet for a grain-oriented electrical steel sheet of the present invention, an amount of surface oxygen x per one surface of the base sheet and a value y of a peak (ΔR/R@1250 cm) of SiOon the surface of the base sheet obtained by infrared reflection spectroscopy satisfy y≥1500xand y≥0.24. A method of manufacturing the base sheet for a grain-oriented electrical steel sheet of the present invention includes: adjusting the amount of surface oxygen per one surface of a final-annealed grain-oriented silicon steel sheet to more than 0.01 g/mand 0.05 g/mor less, or more than 0.05 g/mand 0.10 g/mor less; and performing thermal oxidation annealing in an atmosphere in which an oxidation potential represented by a ratio P/Pof water vapor pressure to hydrogen pressure is 0.0081 or less in a case where the amount of surface oxygen is more than 0.01 g/mand 0.05 g/mor less, or in an atmosphere in which the oxidation potential is 0.005 or less in a case where the amount of surface oxygen is more than 0.05 g/mand 0.10 g/mor less, at a soaking temperature of 1000° C. or lower to form an externally oxidized layer on a surface of the grain-oriented silicon steel sheet.

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