PRIMARY RECRYSTALLIZATION ANNEALED SHEET FOR GRAIN-ORIENTED ELECTRICAL STEEL SHEET PRODUCTION, AND METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

WIPO Patent Application WO/2015/152344

A8

Provided is a process for production of a grain-oriented electrical steel sheet from a primary recrystallization annealed steel sheet that is produced from a steel slab material containing, in mass%, C: 0.001-0.10%, Si: 1.0-5.0%, Mn: 0.01-0.5%, one or more elements selected from S and Se: 0.002-0.040%, sol.Al: 0.001-0.050%, and N: 0.0010-0.020%, the remainder being Fe and unavoidable impurities, and that is obtained subsequent to a nitriding treatment in an intermediate step for producing the grain-oriented electrical steel sheet, wherein nitriding is implemented such that the amount of nitrogen increase (ΔN) produced by the nitriding treatment is 1000 ppm or less, and the N intensity of fluorescence X-rays at the steel sheet surface is 0.59 or more, whereby uniform dispersion of nitrides as inhibitors in the direction of sheet thickness can be achieved in industrially consistent fashion, as a result of which it is possible to consistently produce grain-oriented electrical steel sheets having good magnetic characteristics.

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SHINGAKI YUKIHIRO (JP)
WAKISAKA YUIKO (JP)
INOUE HIROTAKA (JP)

PCT/JP2015/060406

September 01, 2016

March 26, 2015

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JFE STEEL CORP (JP)

C22C38/00; C21D8/12; C22C38/60; H01F1/16

SUGIMURA, Kenji (3-2-1 Kasumigaseki, Chiyoda-k, Tokyo 13, JP)

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