ORIENTED ELECTRICAL STEEL SHEET AND METHOD THEREFOR

• Main Authors: TAKAMIYA TOSHITO, TERAJIMA TAKASHI, WATANABE MAKOTO, SUEHIRO RYUICHI
• Format: Patent
• Language: English; Japanese
• Published: 12.08.2016
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INDUCTANCES; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MAGNETS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSFORMERS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide an oriented electrical steel sheet excellent in film adhesion and iron loss characteristic and a useful manufacturing method therefor.SOLUTION: When an oriented electrical steel sheet is manufactured by hot rolling a steel raw material containing Si:2.0 to 8.0 mass%, cold rolling, decarburization-annealing, applying an annealing separator, and finish annealing, oxygen basis weight of a forsterite film is set at 1.8 to 2.8 g/mas double side, strength ratio of Ti to Mg when X-ray fluorescence analysis is conducted on a surface of the forsterite film (I/I) is set at 0.03 to 0.12 and complexity of a boundary between the forsterite film and ferrite Lis set in a range of 1.1 to 1.9 by setting oxygen basis weight amount after decarburization-annealing of 0.7 to 1.1 g/mas double side, mainly containing MgO, containing at least Ti of 1 to 7%, Na of 20 to 40 ppm based on the whole annealing separator as an additive, and using the annealing separator containing Ba of 5 to 25 ppm in the main agent and/or an additive.SELECTED DRAWING: Figure 4 【課題】被膜密着性と鉄損特性に優れる方向性電磁鋼板を提供するとともに、その有利な製造方法を提案する。【解決手段】Ｓｉ：２．０〜８．０ｍａｓｓ％を含有する鋼素材を熱間圧延し、冷間圧延し、脱炭焼鈍し、焼鈍分離剤を塗布し、仕上焼鈍して方向性電磁鋼板を製造する際、脱炭焼鈍後の酸素目付量を両面で０．７〜１．１ｇ／ｍ２とし、ＭｇＯを主剤とし、添加剤として焼鈍分離剤全体に対して少なくともＴｉを１〜７％、Ｎａを２０〜４０ｐｐｍ含有し、上記主剤中および／または添加剤中にＢａを５〜２５ｐｐｍ含有する焼鈍分離剤を用いることで、フォルステライト被膜の酸素目付量を両面で１．８〜２．８ｇ／ｍ２、上記フォルステライト被膜の表面を蛍光Ｘ線分析したときのＭｇに対するＴｉの強度比（ＩＴｉ／ＩＭｇ）を０．０３〜０．１２、上記フォルステライト被膜と地鉄との界面の複雑度Ｌｃを１．１〜１．９の範囲とする。【選択図】図４