Production of grain-oriented silicon steel sheet reduced in iron loss


PURPOSE: To press locally an insulating film into a base metal and to reduce the iron loss of a silicon steel sheet by irradiating a finish-annealed grain oriented silicon steel sheet having an insulating film with at least two electron beams dissimilar in acceleration energy along the width direction of this steel sheet. CONSTITUTION: After finish annealing is applied to a grain oriented silicon steel sheet, e.g., a forsterite film h 2 is formed on the above steel sheet and also an insulating film h 1 is further formed on the above. Subsequently, the resulting coated steel sheet is irradiated with an electron beam A which has high voltage and small electric current and also has relatively narrow beam diameter and penetrates deeply into the steel sheet, by which local and recessed minute melted regions are formed in the interface between the film and the base metal and simultaneously the film is pressed into these regions to fractionize a magnetic domain. Then, the above sheet is irradiated with an electron beam B of low voltage and small electric current, by which strain in the forsterite film or the insulating film can be released and deterioration in magnetic properties due to the presence of strain can be avoided, and further, iron loss can be advantageously reduced. COPYRIGHT: (C)1992,JPO&Japio




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Cited By (6)

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    JP-2012126995-AJuly 05, 2012Jfe Steel Corp, Jfeスチール株式会社Method for manufacturing grain-oriented electromagnetic steel sheet
    JP-2012172215-ASeptember 10, 2012Nippon Steel Corp, 新日本製鐵株式会社鉄損特性の優れた一方向性電磁鋼板の製造方法
    JP-2012177164-ASeptember 13, 2012Jfe Steel Corp, Jfeスチール株式会社方向性電磁鋼板の製造方法
    JP-2013159850-AAugust 19, 2013Jfe Steel Corp, Jfeスチール株式会社方向性電磁鋼板およびその製造方法
    US-5296051-AMarch 22, 1994Kawasaki Steel CorporationMethod of producing low iron loss grain-oriented silicon steel sheet having low-noise and superior shape characteristics
    US-6929704-B2August 16, 2005Jfe Steel CorporationGrain-oriented electromagnetic steel sheet