NON-ORIENTED ELECTROMAGNETIC STEEL SHEET AND METHOD FOR MANUFACTURING SAME

WIPO Patent Application WO/2023/149269

A1

Provided is a non-oriented electromagnetic steel sheet demonstrating low iron loss at high frequencies, without adding a large amount of an alloy element such as Cr that reduces the magnetic flux density, or reducing sheet thickness that lowers productivity. The non-oriented electromagnetic steel sheet has a prescribed component composition that includes Co at 0.0005-0.0050 mass%; includes, in the range from a surface to a depth of 1/20 the sheet thickness, N that is present in the form of AlN at no more than 0.003 mass%; has, on the surface, an oxide layer including Fe and Al and/or Si; and has, at the interface between the oxide layer and the base iron, an oxide film comprising an Al oxide and/or a Si oxide.

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ZAIZEN YOSHIAKI (JP)
NISHIYAMA TAKESHI (JP)
NAKAGAWA NOBUKO (JP)
OKUBO TOMOYUKI (JP)

PCT/JP2023/001969

August 10, 2023

January 23, 2023

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JFE STEEL CORP (JP)

C22C38/00; C21D8/12; C22C38/14; C22C38/60; H01F1/147

WO2020262063A1	2020-12-30
WO2021117325A1	2021-06-17

JP2003293101A	2003-10-15
JP2011157603A	2011-08-18

SUGIMURA Kenji (JP)

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