Title:
GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND PRODUCTION METHOD FOR GRAIN-ORIENTED ELECTRICAL STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2019/182149
Kind Code:
A1
Abstract:
This grain-oriented electrical steel sheet comprises: a base material steel sheet having a chemical composition containing, in mass%, 0.010% or less of C, 2.50-4.00% of Si, 0.050-1.000% of Mn, a total of 0.005% or less of S and Se, 0.005% or less of soluble Al, 0.005% or less of N, a total of 0-0.0300% of Bi, Te, and Pb, 0-0.50% of Sb, 0-0.50% of Sn, 0-0.50% of Cr, and 0-1.0% of Cu, the balance being Fe and impurities; and a tension-imparting insulating coating film provided on the surface of the base material steel sheet, wherein the surface of the base material steel sheet has an arithmetic mean roughness Ra of 0.60 μm or less in a rolling-90° direction perpendicular to the rolling direction, and when a cross-section along the rolling-90° direction of the base material steel sheet is observed, there are recessed portions having a depth of 0.1-2.0 μm in the surface of the base material steel sheet at a density of 1.0 to 6.0/100 μm.
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Inventors:
TANAKA ICHIRO (JP)
KATAOKA TAKASHI (JP)
KUBOTA NORIYOSHI (JP)
TAKEDA KAZUTOSHI (JP)
KATAOKA TAKASHI (JP)
KUBOTA NORIYOSHI (JP)
TAKEDA KAZUTOSHI (JP)
Application Number:
PCT/JP2019/012252
Publication Date:
September 26, 2019
Filing Date:
March 22, 2019
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; B24C1/06; C21D8/12; C22C38/60; C23C26/00; H01F1/147
Foreign References:
| JP2018003049A | 2018-01-11 | |||
| JP2000038615A | 2000-02-08 | |||
| JP2000038618A | 2000-02-08 | |||
| JPH06116642A | 1994-04-26 | |||
| JP2018054675A | 2018-04-05 | |||
| JPH05311453A | 1993-11-22 | |||
| JP2002249880A | 2002-09-06 | |||
| JP2003313644A | 2003-11-06 | |||
| JP2001303215A | 2001-10-31 |
Other References:
See also references of EP 3770290A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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