METHOD FOR PRODUCING ELECTROMAGNETIC STEEL SHEET, AND COLD-ROLLED SHEET

WIPO Patent Application WO/2023/248861

A1

Provided are a method for producing an electromagnetic steel sheet having excellent magnetic characteristics, and a cold-rolled sheet used in the method. This method involves heating, at 1,300 °C or lower, a steel slab which contains, by mass%, 0-0.100% of C, 1.00-5.00% of Si, 0-1.00% of Mn, 0-0.02% of P, 0-2.00% of Al, 0-0.010% of N, 0-0.010% of S, 0-0.010% of Se, 0-0.100% of Ti, 0-0.100% of Nb, and 0-0.100% of V, and which further contains 0-0.200% of at least one among Sn and Sb in total, and hot-rolling the steel sheet to produce a hot-rolled sheet; performing hot-rolled-sheet-annealing on the hot-rolled sheet, and then cold-rolling the annealed hot-rolled sheet to produce a cold-rolled steel sheet having a final sheet thickness; and performing final-annealing on the cold-rolled steel sheet to produce an electromagnetic steel sheet. When the electromagnetic steel sheet is produced by the method, the difference in strain between the vicinity of grain boundaries and the inside of grains in the processed grains of the cold-rolled steel sheet is set to a predetermined value or more, so that crystal grains having a specific orientation emerge preferentially without impairing the grain growth properties of the recrystallized grains, thereby ensuring excellent magnetic properties.

IMAMURA TAKESHI (JP)
OKUBO TOMOYUKI (JP)

PCT/JP2023/021838

December 28, 2023

June 13, 2023

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JFE STEEL CORP (JP)

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

WO2016017263A1

2016-02-04

JP2003082414A	2003-03-19
JPH03120316A	1991-05-22
US20110273054A1	2011-11-10

GINZA MARONIE P.C. (JP)

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