SOFT MAGNETIC STEEL SHEET, LAMINATED SOFT MAGNETIC STEEL SHEET, AND EACH PRODUCTION METHOD FOR ELECTROMAGNETIC COMPONENT

• Main Authors: INOUE KENICHI, MITANI HIROYUKI, TSUCHIDA TAKEHIRO, FUJII HIDEO
• Format: Patent
• Language: English; Japanese
• Published: 15.06.2017
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INDUCTANCES; MAGNETS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL

PROBLEM TO BE SOLVED: To provide a method for producing a soft magnetic steel sheet excellent in magnetic properties and magnetic isotropic properties.SOLUTION: Provided is a method for producing a soft magnetic steel sheet comprising: a hot rolling step where a pure iron-based component steel stock is subjected to a hot rolling step so as to be a hot rolled sheet; a hot rolled sheet annealing step where the hot rolled sheet is subjected to hot rolled sheet annealing according to necessity; a cold rolling step where the hot rolled sheet subjected to the hot rolled sheet annealing according to necessity is subjected to cold rolling for one time or two or more times including process annealing so as to be a cold rolled sheet with a final sheet thickness of 0.1 to 3 mm; a primary recrystallization annealing step where the cold rolled sheet is subjected to the primary crystallization annealing; a local strain application step where prestrains are locally applied to the surface of the cold rolled sheet subjected to a primary recrystallization annealing by mechanical working; and a secondary recrystallization annealing step where the cold rolled sheet applied with local prestrains is subjected to a secondary recrystallization annealing to obtain a soft magnetic steel sheet in which the magnetic anisotropy in the sheet face is minimized. The local application of the prestrains to the cold rolled sheet is preferably performed by shot peening treatment where projection bodies with a diameter of 0.1 to 0.5 mm are projected under the conditions where impulse face density is controlled to 15 to 130 kg/(m s).SELECTED DRAWING: None 【課題】磁気特性と磁気等方性に優れた軟磁性鋼板の製造方法を提供する。【解決手段】純鉄系成分の鋼素材を熱間圧延して熱延板とする熱延工程と、前記熱延板に必要に応じて熱延板焼鈍を施す熱延板焼鈍工程と、前記必要に応じて熱延板焼鈍を施した前記熱延板を１回または中間焼鈍を挟む２回以上の冷間圧延して０．１〜３ｍｍの最終板厚の冷延板とする冷延工程と、前記冷延板に一次再結晶焼鈍を施す一次再結晶焼鈍工程と、前記一次再結晶焼鈍を施した前記冷延板の表面に機械的加工により局所的に予歪を付与する局所歪付与工程と、前記表面に局所的に予歪を付与した前記冷延板に二次再結晶焼鈍を施すことで、板面内の磁気異方性が極小化された軟磁性鋼板を得る二次再結晶焼鈍工程と、を備える。前記冷延板への局所的な予歪の付与は、直径０．１〜０．５ｍｍの投射体を力積面密度が１５〜１３０ｋｇ／（ｍ・ｓ）の条件で投射するショットピーニング処理によって行うことが好ましい。【選択図】なし