METHOD FOR PRODUCING GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET

WIPO Patent Application WO/2022/255258

A1

Provided is a method for producing a grain-oriented electromagnetic steel sheet which inhibits occurrence of ridging and which has a favorable shape. This method for producing a grain-oriented electromagnetic steel sheet comprises: heating a steel slab containing, in mass%, 0.02-0.10% of C, 2.5-5.5% of Si, 0.01-0.30% of Mn, and a total of 0.0010-0.040% of at least one element of S and Se; performing hot-rolling; performing, after performing hot-rolled sheet annealing or without performing hot-rolled sheet annealing, cold-rolling once or at least twice with an intermediate annealing interposed therebetween, so as to obtain a cold-rolled sheet having a final thickness; subjecting the resulting sheet to primary recrystallization annealing that also serves as decarburization annealing; and subjecting the resulting sheet to final annealing. The heating temperature for the slab is at least 1300ºC. When performing rough rolling in the hot-rolling, a rolling pass is performed at a temperature range of at least 1200ºC, and the next rolling pass is performed in the opposite direction after an interval of at least 5 seconds. The total rolling reduction percentage of the rough rolling is set to at least 75%.

TAKENAKA MASANORI (JP)
IMAMURA TAKESHI (JP)
TAKAHASHI MARI (JP)
NAKAMURA KOJI (JP)

PCT/JP2022/021772

December 08, 2022

May 27, 2022

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JFE STEEL CORP (JP)

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

WO2017155057A1	2017-09-14
WO2020067136A1	2020-04-02
WO2017159507A1	2017-09-21

JPH0310020A	1991-01-17
US4204891A	1980-05-27
JPH08157963A	1996-06-18
JPH0892644A	1996-04-09
JP2005262217A	2005-09-29

GINZA MARONIE P.C. (JP)

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