NON-ORIENTED ELECTROMAGNETIC STEEL SHEET AND METHOD FOR PRODUCING SAME

Title:

NON-ORIENTED ELECTROMAGNETIC STEEL SHEET AND METHOD FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2016/111088

Kind Code:

A1

Abstract:

When this non-oriented electromagnetic steel sheet is produced by hot rolling a slab that contains, in mass%, 0.0050% or less of C, 1.5-5.0% of Si, 0.20-3.0% of Mn, 0.0050% or less of sol. Al, 0.2% or less of P, 0.0050% or less of S and 0.0040% or less of N, thereby forming a hot rolled sheet, and by subsequently subjecting the hot rolled sheet to cold rolling, without carrying out hot rolled sheet annealing, and then to finish annealing, the composition ratio of CaO in oxide-based inclusions present in the slab, said composition ratio of CaO being defined by CaO/(SiO2 + Al2O3 + CaO), is set to 0.4 or more and/or the composition ratio of Al2O3 in the oxide-based inclusions present in the slab, said composition ratio of Al2O3 being defined by Al2O3/(SiO2 + Al2O3 + CaO), is set to 0.3 or more, and the coil winding temperature during the hot rolling is set to 650°C or more. Consequently, this non-oriented electromagnetic steel sheet achieves excellent recyclability, high magnetic flux density and low iron loss.

Inventors:

NAKANISHI TADASHI (JP)
NAKAJIMA HIROAKI (JP)
OKUBO TOMOYUKI (JP)
ODA YOSHIHIKO (JP)

Application Number:

PCT/JP2015/082191

Publication Date:

July 14, 2016

Filing Date:

November 17, 2015

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C22C38/00; C21D8/12; C22C38/06; C22C38/60; H01F1/16; C21C7/00; C21C7/04

Domestic Patent References:

WO2015025758A1

2015-02-26

Foreign References:

JP2004149823A	2004-05-27
CN101812629A	2010-08-25
CN102796947A	2012-11-28
KR20020018226A	2002-03-08

Other References: