NON-ORIENTED ELECTRICAL STEEL SHEET METHOD FOR MANUFACTURING THE SAME AND MOTOR CORE COMPRISING THE SAME

• Main Author: KWON SOOBIN
• Format: Patent
• Language: English; Korean
• Published: 30.06.2023
• 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; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DIFFUSION TREATMENT OF METALLIC MATERIAL; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; GENERATION; 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

A non-oriented electrical steel sheet according to an embodiment of the present invention includes: a steel sheet base material containing 1.0 to 6.5 wt% of Si, 0.1 to 1.3 wt% of Al, 0.3 to 2.0 wt% of Mn, and the balance Fe and inevitable impurities; and an insulating film located on the steel sheet base material, wherein the steel sheet base material satisfies the following Formula 1, and the insulating film satisfies the following Formula 2: [Formula 1] 0.1 <= [Mn(1)] / [Mn(10)] <= 1.0; and [Formula 2] [Fe] >= ([Al] + [Mn] + [Mg] / 10) (in the Formula 1, [Mn(1)] represents the Mn concentration (wt%) at a depth of 1 μm from the boundary surface between the base material and the insulating film in the inward direction of the base material, and [Mn(10)] represents the Mn concentration at a depth of 10 μm. In Formula 2, [Fe], [Al], [Mn], and [Mg] represent the contents (wt%) of Fe, Al, Mn, and Mg at the center of the thickness direction of the insulating film.) Therefore, non-oriented electrical steel sheets can improve the stability of the coating after stress relief annealing. 본 발명의 일 실시예에 의한 무방향성 전기강판은 중량%로, Si : 1.0 내지 6.5%, Al : 0.1 내지 1.3%, Mn : 0.3 내지 2.0% 및 잔부 Fe 및 불가피한 불순물을 포함하는 강판 모재 및 강판 모재 상에 위치하는 절연 피막을 포함하고, 강판 모재는 하기 식 1을 만족하고, 절연 피막이 하기 식 2를 만족한다. [식 1] 0.1 ≤ [Mn(1)] / [Mn(10)] ≤ 1.0 [식 2] [Fe] ≥ ([Al] + [Mn] + [Mg] / 10 (상기 식 1에서 [Mn(1)]는 모재 및 절연 피막의 경계면으로부터 상기 모재의 내부 방향으로, 1㎛ 깊이에서의 Mn 농도(중량%)이고, [Mn(10)]는 10㎛ 깊이에서의 Mn 농도를 나타낸다. 식 2에서 [Fe], [Al], [Mn] 및 [Mg]는 절연 피막 두께방향 중심에서 Fe, Al, Mn 및 Mg의 함량(중량%)을 나타낸다.)