NON-ORIENTED ELECTROMAGNETIC STEEL SHEET, METHOD FOR PRODUCING SAME AND MOTOR CORE

WIPO Patent Application WO/2021/006280

A1

According to the present invention, a non-oriented electromagnetic steel sheet which has an average crystal grain size of 80 μm or less, an area ratio of crystal grains having a crystal size not less than 1.5 times the average crystal grain size of 10% or more, and an area ratio of crystal grains having an aspect ratio of 0.3 or less of 20% or less is obtained by subjecting a steel material that contains, in mass%, 0.005% or less of C, from 2.0% to 5.0% of Si, from 0.05% to 5.0% of Mn, 3.0% or less of Al and from 0.0003% to 0.0050% of Zn to hot rolling, cold rolling and cold rolled sheet annealing, and by setting the average heating rate from 500°C to 700°C in the heating process of the cold rolled sheet annealing to 10°C/s or more and heating the steel material to an annealing temperature between 700°C and 850°C.

JP3489945	PRODUCTION OF LOW CORE LOSS MIRROR FINISHED GRAIN ORIENTED SILICON STEEL SHEET HIGH IN MAGNETIC FLUX DENSITY
JPH04224626	MANUFACTURE OF GRAIN-ORIENTED SILICON STEEL SHEET FREE FROM ABNORMAL GRAIN
JP6770260	Manufacturing method of non-oriented electrical steel sheet, manufacturing method of motor core and motor core

TANAKA TAKAAKI (JP)
OKUBO TOMOYUKI (JP)
ZAIZEN YOSHIAKI (JP)
ODA YOSHIHIKO (JP)
MIYAMOTO YUKINO (JP)

PCT/JP2020/026599

January 14, 2021

July 07, 2020

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JFE STEEL CORP (JP)

C21D8/12; C21D9/00; C22C38/00; C22C38/06; C22C38/60; H01F1/147; H01F3/02

WO2018164185A1

2018-09-13

JP2019019355A	2019-02-07
JP2016138316A	2016-08-04
KR20180071587A	2018-06-28
US20140366988A1	2014-12-18
CN105950960A	2016-09-21
JP2008050686A	2008-03-06

See also references of EP 3998358A4

GINZA MARONIE P.C. (JP)

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