METHOD FOR FORMING LINEAR GROOVE AND METHOD FOR PRODUCING GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET

Title:

METHOD FOR FORMING LINEAR GROOVE AND METHOD FOR PRODUCING GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET

Document Type and Number:

WIPO Patent Application WO/2021/229933

Kind Code:

A1

Abstract:

To form a linear groove having a desired groove width on a metal strip surface and, as a result, provide a grain-oriented electromagnetic steel sheet having extremely exceptional magnetic characteristics. A groove formation method in which a resist film is formed on at least one side of a metal strip, the resist film is subsequently irradiated with a laser while scanning in a direction that crosses the rolling direction of the metal strip to remove the resist film at the portion irradiated by the laser, and the portion of the metal strip from which the resist film has been removed is then etched to form a linear groove, wherein the resist film contains 20 mass% or more of inorganic compounds in terms of solids content, the laser has an elliptical beam shape in which the ratio of the major axis diameter to the minor axis diameter is 5.0 or higher on the metal strip surface, and the beam diameter in the direction orthogonal to scanning is 10-100 μm (inclusive).

Inventors:

SUEHIRO RYUICHI (JP)
OMURA TAKESHI (JP)
TAKAJO SHIGEHIRO (JP)
ICHIHARA YOSHIHISA (JP)

Application Number:

PCT/JP2021/013086

Publication Date:

November 18, 2021

Filing Date:

March 26, 2021

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C21D8/12; H01F1/147; C22C38/00; C22C38/60

Domestic Patent References:

WO2017017908A1	2017-02-02
WO2016129235A1	2016-08-18
WO2016092858A1	2016-06-16
WO2017017908A1	2017-02-02

Foreign References:

JP2017025377A	2017-02-02
KR20180074131A	2018-07-03

Other References: