NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR PRODUCING SAME, AND METHOD FOR PRODUCING MOTOR CORES

WIPO Patent Application WO/2023/090138

A1

The purpose is to provide, by utilization of primary recrystallization, control of the new crystal texture, and control of grain size, a non-oriented electrical steel sheet that not only has low low-frequency iron losses, but also low high-frequency iron losses. The non-oriented electrical steel sheet has a component composition that contains, in mass%, C : not more than 0.0050%, Si : 1.0-7.5%, Mn : not more than 2.00%, P : not more than 0.10%, and S : not more than 0.0040% with the balance being Fe and unavoidable impurities. The sheet thickness is not more than 0.20 mm. In the ODF, the maximum intensity is within Φ = 0°, and the intensity at the position φ1 = 45°, φ2 = 45°, and Φ = 0° is at least 4.0. The method for producing non-oriented electrical steel sheet is a production method that performs: hot rolling of a steel material having a prescribed component composition; cold rolling two times with an interposed intermediate annealing; and subsequently a final annealing. The reduction ratio in the first cold rolling is at least 92%, and the reduction ratio in the second cold rolling is 30-80%.

TAKAJYO SHIGEHIRO (JP)
ZAIZEN YOSHIAKI (JP)

PCT/JP2022/040677

May 25, 2023

October 31, 2022

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JFE STEEL CORP (JP)

C22C38/00; C21D8/12; C22C38/04; C22C38/60; H01F1/147

WO2020204107A1

2020-10-08

JP2012036454A	2012-02-23
JP2017106101A	2017-06-15
JP2020180347A	2020-11-05
JP6767687B1	2020-10-14
CN104480386A	2015-04-01
CN107245644A	2017-10-13

GINZA MARONIE P.C. (JP)

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