METHOD FOR PRODUCING GRAIN ORIENTED SILICON STEEL SHEET

PROBLEM TO BE SOLVED: To provide a grain oriented silicon steel sheet excellent in transformer iron loss and a building factor, and in which the damage of a tensile film is suppressed.SOLUTION: Provided is a grain oriented silicon steel sheet having a tensile film, interlayer current is controlled to 0.15 A or lower, a plurality of linear strains elongating to a direction crossed with the rolling direction are formed, linear spacing in the rolling direction of the plurality of linear strains is controlled to 15 mm or lower, preferably, to 4 mm or higher, and a reflux magnetic domains in which the length d in the sheet thickness direction is 65 μm or higher and the length w in the rolling direction is 250 μm or lower is formed at the strains parts.SELECTED DRAWING: Figure 5 【課題】変圧器鉄損とビルディングファクターに優れ、張力被膜の損傷が抑制された方向性電磁鋼板の提供。【解決手段】張力被膜を備える方向性電磁鋼板において、層間電流を０．１５Ａ以下とし、前記鋼板に、圧延方向と交差する方向に伸びる複数の直線状の歪が形成されており、前記複数の直線状の歪の圧延方向における線間隔を１５ｍｍ以下で好ましくは４ｍｍ以上とし、前記歪部分に、板厚方向の長さｄが６５μｍ以上、圧延方向の長さｗが２５０μｍ以下である還流磁区を形成されている方向性電磁鋼板。【選択図】図５