UNIDIRECTIONALLY GRAIN ORIENTED ELECTROMAGNETIC STEEL SHEET HAVING EXCELLENT FILM ADHESION, AND METHOD FOR MANUFACTURING THE SAME

Title:

UNIDIRECTIONALLY GRAIN ORIENTED ELECTROMAGNETIC STEEL SHEET HAVING EXCELLENT FILM ADHESION, AND METHOD FOR MANUFACTURING THE SAME

Document Type and Number:

WIPO Patent Application WO/2008/062853

Kind Code:

A1

Abstract:

This invention provides a unidirectionally grain oriented electromagnetic steel sheet comprising, by mass, 2 to 7% of Si and having a primary film composed mainly of forsterite on its surface. The primary film comprises at least one element selected from Ca, Sr and Ba, a rare earth metal element, and a sulfur-containing compound (A). According to the above constitution, the compound (A) is present in the interface layer between the primary film and the steel sheet. As a result, in the manufacture of a wound core transformer or the like, the separation of a primary film caused in a highly bending part can be prevented.

Inventors:

KUBO YUJI (JP)
NANBA EIICHI (JP)
ARAI SATOSHI (JP)
HONMA HOTAKA (JP)
MIZUKAMI KAZUMI (JP)
TANAKA KOKI (JP)

Application Number:

PCT/JP2007/072600

Publication Date:

May 29, 2008

Filing Date:

November 15, 2007

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)
KUBO YUJI (JP)
NANBA EIICHI (JP)
ARAI SATOSHI (JP)
HONMA HOTAKA (JP)
MIZUKAMI KAZUMI (JP)
TANAKA KOKI (JP)

International Classes:

C22C38/00; B21B3/02; C21D8/12; C21D9/46; C22C38/02; C22C38/60; C23C22/00; H01F1/16; H01F1/18

Domestic Patent References:

WO2006126660A1

2006-11-30

Foreign References:

JPH06192743A	1994-07-12
JP2005264280A	2005-09-29
JPS4015644B1
JPH0688171A	1994-03-29
JPS572252B2	1982-01-14
JPS582569B2	1983-01-17
JPS60141830A	1985-07-26
JPS6115152B2	1986-04-22
JPH08295937A	1996-11-12
JPH09118921A	1997-05-06

Other References: