METHOD FOR PRODUCING ORIENTED ELECTROMAGNETIC STEEL SHEET

• Main Authors: TERASHIMA TAKASHI, TAKAMIYA TOSHITO, WATANABE MAKOTO, SUEHIRO RYUICHI
• Format: Patent
• Language: English; Korean
• Published: 02.12.2016
• 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; 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

mass％ 로 C : 0.002 ∼ 0.10 ％, Si : 2.5 ∼ 6.0 ％, Mn : 0.01 ∼ 0.8 ％ 를 함유하고, 인히비터 성분으로서, Al 및 N, 혹은, S 및/또는 Se, 혹은, Al, N, S 및/또는 Se 를 함유하는 슬래브를 열간 압연하고, 열연판 어닐링하고, 냉간 압연하고, 탈탄 어닐링하고, 어닐링 분리제를 도포하고, 마무리 어닐링을 실시하는 방향성 전기 강판의 제조 방법에 있어서, 상기 탈탄 어닐링의 가열 과정에 있어서의 700 ∼ 800 ℃ 사이의 어느 온도를 T1, 820 ∼ 900 ℃ 사이의 어느 온도로 설정된 균열 온도를 T2 라고 했을 때, 500 ∼ T1 사이의 승온 속도 R1 을 80 ℃／s 이상, T1 ∼ T2 사이의 승온 속도 R2 를 15 ℃／s 이하로 하여 가열함으로써, 탈탄 어닐링의 가열 과정에서 급속 가열을 실시할 때에도, 탈탄성을 확보하고, 자기 특성과 포스테라이트 피막의 내박리성이 우수한 방향성 전기 강판을 얻는다. In a method for producing a grain-oriented electrical steel sheet by subjecting a slab containing C: 0.002-0.10 mass%, Si: 2.5-6.0 mass%, Mn: 0.01-0.8 mass% and further containing A1 and N, or S and/or Se, or A1, N, S and/or Se as inhibitor ingredients to hot rolling, hot band annealing, cold rolling, decarburization annealing, application of an annealing separator and finish annealing, when a certain temperature within a range of 700-800°C in a heating process of the decarburization annealing is T1 and a certain temperature as a soaking temperature within a range of 820-900°C is T2, a heating rate R1 between 500°C and T1 is set to not less than 80°C/s and a heating rate R2 between T1 and T2 is set to not more than 15°C/s, whereby a grain-oriented electrical steel sheet having excellent magnetic properties and peeling resistance of forsterite coating is obtained while ensuring decarburization property even when rapid heating is performed in the heating process of the decarburization annealing.