GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD OF MANUFACTURING THEREOF

• Main Authors: LEE SANGWOO, SONG JAEHWA, KO KYUNGJUN
• Format: Patent
• Language: English; Korean
• Published: 26.06.2023
• 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

The present invention relates to a grain-oriented electrical steel sheet and a manufacturing method thereof. The grain-oriented electrical steel sheet according to an embodiment of the present invention comprises: a base material containing 2.5-4.0 wt% of Si, 0.005 wt% or less of C, 0.015-0.040 wt% of Al, 0.04-0.15 wt% of Mn, 0.005 wt% or less of N, 0.03-0.10 wt% of Sn, 0.05-0.2 wt% of Cr, 0.010-0.050 wt% of P, and 0.01-0.05 wt% of Sb, with the remainder including Fe and inevitable impurities; and a metal oxide layer disposed on the base material, wherein an average iron loss (W_(17/50)) is 0.80 W/kg or less, and wherein the maximum light emission intensity ratio of the metal oxide layer may satisfy expression 1. <expression 1> I(Cr) / I_max(Mg) <= 2 % (In expression 1, I(Cr) is the intensity of Cr in the metal oxide layer, and I_max(Mg) denotes the maximum light emission intensity of Mg in the metal oxide layer) Therefore, provided is an ultrathin grain-oriented electrical sheet having improved magnetism and excellent surface characteristics, and having an iron loss variance reduced. 본 발명은 방향성 전기강판 및 이의 제조 방법에 관한 것이다. 본 발명의 일 실시예에 따른, 방향성 전기강판은 중량%로서, Si: 2.5 내지 4.0 중량%, C: 0.005 중량% 이하, Al: 0.015 내지 0.040 중량%, Mn: 0.04 내지 0.15 중량%, N: 0.005 중량% 이하, Sn: 0.03 내지 0.10 중량%, Cr: 0.05 내지 0.2 중량%, P: 0.010 내지 0.050 중량%, 및 Sb: 0.01 내지 0.05 중량%를 포함하고, 잔부 Fe 및 기타 불가피하게 혼입되는 불순물을 포함하는 모재, 및 상기 모재 상에 배치되는 금속 산화물 층을 포함하고, 평균 철손(W17/50)이 0.80 W/kg 이하이며, 상기 금속 산화물층의 최대 발광강도 비가 하기 식 1을 만족할 수 있다. <식 1> I(Cr)/I_max(Mg) ≤ 2 % (상기 식 1에서, I(Cr)은 상기 금속 산화물층에서의 Cr 강도이고, I_max(Mg)는 상기 금속 산화물층에서 Mg의 최대 발광강도를 의미한다)