METHOD FOR MANUFACTURING ORIENTED ELECTROMAGNETIC STEEL SHEET

WIPO Patent Application WO/2022/250111

A1

According to the present invention, an oriented electromagnetic steel sheet is manufactured by: heating, at a temperature of at least 1,300ºC, a steel slab containing, in terms of mass%, 0.02-0.10% of C, 2.5-5.5% of Si, 0.01-0.30% of Mn, 0.0010-0.040% of S, and 0-0.040% of Se; then hot-rolling the steel slab; annealing the hot-rolled sheet, if necessary; performing cold-rolling once, or at least twice with intermediate annealing therebetween to obtain a cold-rolled sheet having the final sheet thickness; performing primary recrystallization annealing including decarburization annealing; applying an annealing separation agent onto the surface of the steel sheet; and then performing finish annealing. When said oriented electromagnetic steel sheet is manufactured, the slab-side temperature T at the start of rough rolling during the hot rolling is set to at most a temperature Te defined by expression (1) of Te=-120,000 [%S]2+1,400, and width reduction is performed after at least one pass of the rough rolling, thereby effectively preventing edge cracks occurring in the hot rolling.

TAKENAKA MASANORI (JP)
SADAHIRO KENICHI (JP)
TANAKA TAKAAKI (JP)
IMAMURA TAKESHI (JP)

PCT/JP2022/021549

December 01, 2022

May 26, 2022

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JFE STEEL CORP (JP)

C21D8/12; C22C38/00; C22C38/60; H01F41/02

JPH0347601A	1991-02-28
JPH04157118A	1992-05-29
JPS60200916A	1985-10-11
JP2009012033A	2009-01-22

GINZA MARONIE P.C. (JP)

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