일 방향성 전자 강판의 제조 방법

• Main Authors: TAKAHASHI MASARU, USHIGAMI YOSHIYUKI, YASUDA MASATO, NAGANO SHOHJI, ZAIZEN YOICHI
• Format: Patent
• Language: Korean
• Published: 09.09.2021
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR 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; TRANSFORMERS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

이 일 방향성 전자 강판의 제조 방법은, 소정의 화학 조성을 갖는 강 슬래브를 1250℃ 미만으로 가열하고, 열간 압연에 제공하여 열연 강판으로 하고, 상기 열연 강판에 열연판 어닐링을 실시하고, 상기 열연판 어닐링 후의 상기 열연 강판을 산세하고, 상기 산세 후의 상기 열연 강판을 냉간 압연에 제공하여, 최종 판 두께 d가 0.15 내지 0.23㎜인 냉연 강판으로 하고, 상기 냉연 강판에, 탈탄 어닐링 및 질화 처리를 포함하는 탈탄 질화 처리를 실시하고, 상기 탈탄 질화 처리 후의 상기 냉연 강판에 마무리 어닐링을 실시하고, 상기 마무리 어닐링 후의 상기 냉연 강판에 절연 피막 형성용 도포액을 도포하고, 베이킹하는 일 방향성 전자 강판의 제조 방법이며, 상기 강 슬래브의 Sol.Al과 N의 질량비인 Sol.Al/N과, 상기 최종 판 두께 d가 소정의 관계식을 충족하고, 상기 탈탄 질화 처리 후의 상기 냉연 강판의 N 함유량이 40 내지 1000ppm이며, 상기 탈탄 어닐링에 있어서의 탈탄 어닐링 온도가 1000℃ 미만이다. A method for manufacturing a grain-oriented electrical steel sheet includes: heating a steel slab having a prescribed chemical composition to lower than 1250 °C and subjecting the steel slab to hot rolling to obtain a hot-rolled steel sheet; performing hot-band annealing on the hot-rolled steel sheet; pickling the hot-rolled steel sheet which has been subjected to the hot-band annealing; subjecting the hot-rolled steel sheet which has been subjected to the pickling to cold rolling to obtain a cold-rolled steel sheet having a final sheet thickness d of 0.15 to 0.23 mm; performing a decarburization nitriding treatment including decarburization annealing and nitriding on the cold-rolled steel sheet; performing final annealing on the cold-rolled steel sheet which has been subjected to the decarburization nitriding treatment; and then applying a coating liquid for insulation coating formation to the cold-rolled steel sheet which has been subjected to the final annealing and baking the cold-rolled steel sheet. Sol. Al/N which is a mass ratio between Sol. Al and N in the steel slab and the final sheet thickness d satisfy a prescribed relational expression, the N content of the cold-rolled steel sheet which has been subjected to the decarburization nitriding treatment is 40 to 1000 ppm, and a decarburization annealing temperature in the decarburization annealing is lower than 1000 °C.