NON-ORIENTED ELECTRICAL STEEL PLATE AND MANUFACTURING METHOD THEREOF

WIPO Patent Application WO/2023/282072

A1

When a non-oriented electrical steel plate is manufactured by hot rolling a slab including predetermined amounts of C, Si, Mn, Al, N and Cr, annealing the hot-rolled plate, cold rolling, and finish annealing in a continuous annealing furnace, a non-oriented electrical steel plate with low core loss in a high-frequency region is obtained by setting the maximum reached temperature of the finish annealing to 900°C or more, the average cooling rate from the temperature of (the maximum reached temperature - 50°C) to 500°C in the cooling process of the finish annealing to 40°C/s or more, a parameter ε/t defined from the plastic elongation rate ε (%) in the rolling direction before and after the finish annealing and the soaking time t (s) of the finish annealing to 0.10 or more, the average grain size of ferrite to 50 μm or more, and each of the compressive residual stresses σS and σC in the plate width direction at the steel plate surface and the plate thickness center, which are determined by an X-ray stress measurement method, to 2.0 MPa or more.

OKUBO TOMOYUKI (JP)
ZAIZEN YOSHIAKI (JP)
TANAKA TAKAAKI (JP)
SUEHIRO RYUICHI (JP)
MIYAMOTO YUKINO (JP)

PCT/JP2022/025041

January 12, 2023

June 23, 2022

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JFE STEEL CORP (JP)

C21D8/12; C21D9/46; C22C38/00; C22C38/38; C22C38/60; H01F1/147

CN111057821A	2020-04-24
JP2012036455A	2012-02-23
JP2009185357A	2009-08-20
JPH01219125A	1989-09-01
JP2014210978A	2014-11-13
JP2008231504A	2008-10-02

GINZA MARONIE P.C. (JP)

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