MULTILAYER ELECTROMAGNETIC STEEL SHEET

Title:

MULTILAYER ELECTROMAGNETIC STEEL SHEET

Document Type and Number:

WIPO Patent Application WO/2019/117089

Kind Code:

A1

Abstract:

A multilayer electromagnetic steel sheet which achieves both low high-frequency iron loss and high magnetic flux density is provided. In this multilayer electromagnetic steel sheet comprising an inner layer and surface layer provided on both sides of the inner layer, the Si content of the surface layers is 2.5-6.0 mass%, the Si content of the inner layer is 1.5-5.0 mass%, the difference ΔSi in Si content between the surface layers and the inner layer is greater than or equal to 0.5 mass%, the absolute value ΔAl of the difference in Al content between the surface layers and the inner layer is less than or equal to 0.05 mass%, the absolute value Δλ1.0/400 of the difference in magnetostriction of the surface layers and the magnetostriction of the inner layer is less thanor equal to 1.0×10-6, the sheet thickness t of the multilayer electromagnetic sheet is 0.03-0.3 mm, and the ratio of the total thickness t1 of the surface layers to t is 0.10-0.70.

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Inventors:

ODA YOSHIHIKO (JP)
ZAIZEN YOSHIAKI (JP)
HIRATANI TATSUHIKO (JP)

Application Number:

PCT/JP2018/045340

Publication Date:

June 20, 2019

Filing Date:

December 10, 2018

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C22C38/00; C22C38/06; C22C38/60; H01F1/147; C21D8/12

Foreign References:

JPH11293415A	1999-10-26
JP2010063252A	2010-03-18
JP2012251191A	2012-12-20
JPH05195169A	1993-08-03
JPH08165520A	1996-06-25
JPH11293422A	1999-10-26

Other References: