GRAIN ORIENTED ELECTRICAL STEEL SHEET METHOD FOR MANUFACTURING THE SAME

• Main Authors: LEE SANGWOO, KO KYUNGJUN
• Format: Patent
• Language: English; Korean
• Published: 28.06.2023
• 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

A method for manufacturing a grain-oriented electrical steel sheet according to an embodiment of the present invention comprises, in weight%: 2.5 to 4.0% of SI; 0.03 to 0.09% of C; 0.015 to 0.040% of Al; 0.04 to 0.15% of Mn; 0.01% or less (excluding 0%) of S; 0.002 to 0.012% of N; 0.01 to 0.05% of Sb; 0.03 to 0.1% of Sn; 0.05-0.2% of Cr; and the balance of Fe and inevitable impurities. The method includes the steps of: manufacturing a hot-rolled sheet by hot-rolling a slab; manufacturing a cold-rolled sheet by cold-rolling the hot-rolled sheet; performing primary recrystallization annealing of the cold-rolled sheet; and performing secondary recrystallization annealing on the steel sheet on which the primary recrystallization annealing has been completed. 본 발명의 일 실시예에 의한 방향성 전기강판의 제조 방법은 중량%로, Si: 2.5 내지 4.0%, C: 0.03 내지 0.09%, Al: 0.015 내지 0.040%, Mn: 0.04 내지 0.15%, S : 0.01% 이하(0%를 제외함), N: 0.002 내지 0.012%, Sb: 0.01 내지 0.05%, Sn: 0.03 내지 0.1% 및 Cr: 0.05 내지 0.2% 포함하고, 잔부 Fe 및 불가피한 불순물을 포함하는 슬라브를 열간압연하여 열연판을 제조하는 단계; 열연판을 냉간압연하여 냉연판을 제조하는 단계; 냉연판을 1차 재결정 소둔하는 단계; 및 1차 재결정 소둔이 완료된 강판을 2차 재결정 소둔하는 단계를 포함한다.