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    NON-ORIENTED ELECTRICAL STEEL SHEET, METHOD FOR MANUFACTURING SAME, AND MOTOR CORE COMPRISING SAME
    4.
    发明公开
    NON-ORIENTED ELECTRICAL STEEL SHEET, METHOD FOR MANUFACTURING SAME, AND MOTOR CORE COMPRISING SAME 审中-公开

    公开(公告)号：EP4455343A1

    公开(公告)日：2024-10-30

    申请号：EP22911928.4

    申请日：2022-12-21

    申请人： POSCO Co., Ltd

    发明人： KWON, Soobin

    IPC分类号： C22C38/34 ,  C22C38/38 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/32 ,  C22C38/28 ,  C21D8/12 ,  H01F1/147 ,  H02K15/02

    摘要： A non-oriented electrical steel sheet according to an embodiment of the present invention includes: a steel sheet base material containing, by wt%: 2.0 to 6.5% of Si, 0.1 to 1.3% of Al, 0.3 to 2.0% of Mn, 0.005 to 0.06% of Cr, and a balance of Fe and other inevitable impurities; and an insulating coating film positioned on the steel sheet base material, wherein Formula 1 below is satisfied before stress relief annealing, and Formula 2 below is satisfied after the stress relief annealing. 0.1 ≥ Mn coating film / Mn50 10 ≥ Mn coating film / Mn50 ≥ 1 (in Formulas 1 and 2, [Mn coating film] refers to an average content of Mn (wt%) in the insulating coating film, and [Mn50] refers to a content of Mn (wt%) at a depth of 50 µm from an interface between the steel sheet base material and the insulating coating film toward an inside of the steel sheet base material.)

    GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREFOR
    5.
    发明公开
    GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREFOR 审中-公开

    公开(公告)号：EP4455342A1

    公开(公告)日：2024-10-30

    申请号：EP22911834.4

    申请日：2022-12-20

    申请人： POSCO Co., Ltd

    发明人： SONG, DaeHyun ,  LEE, Sangwoo ,  PARK, Junesoo

    IPC分类号： C22C38/34 ,  C22C38/20 ,  C22C38/22 ,  C21D8/12 ,  H01F1/147

    摘要： The present invention relates to a grain-oriented electrical steel sheet and a manufacturing method therefor. The grain-oriented electrical steel sheet according to one embodiment of the present invention may comprise, in wt%, 2.0 to 6.0 wt% of Si, 0.005 to 0.04 wt% of acid-soluble Al, 0.01 to 0.2 wt% of Mn, at most 0.01 wt% of N, 0.0005 to 0.045 wt% of P, at most 0.010 wt% of S, 0.01 to 0.05 wt% of Sb, at most 0.005 wt% of C, 0.03 to 0.08 wt% of Sn, 0.01 to 0.2 wt% of Cr, 0.031 to 0.25 wt% of Cu, 0.01 to 0.05 wt% of Mo, and the remainder in Fe and other unavoidable impurities, and satisfy Formula 1. "> 0.03 Sn √ Cu + Sb − 0.3 2
    (In formula 1, [Sn], [Cu], and [Sb] represent the wt% of Sn, Cu, and Sb, respectively, √ represents a square root, and | | represents an absolute value).

    NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING SAME
    6.
    发明公开
    NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING SAME 审中-公开

    公开(公告)号：EP4455333A1

    公开(公告)日：2024-10-30

    申请号：EP22911903.7

    申请日：2022-12-20

    申请人： POSCO Co., Ltd

    发明人： KIM, Jae-Hoon ,  SHIN, Su-Yong ,  KIM, Yunsu

    IPC分类号： C22C38/02 ,  C22C38/06 ,  C22C38/04 ,  C22C38/12 ,  C21D8/12 ,  H01F1/147

    摘要： A non-oriented electrical steel sheet according to an embodiment of the present invention contains, by wt%: 3.1 to 3.8% of Si, 0.5 to 1.5% of Al, 0.3 to 1.5% of Mn, 0.01 to 0.15% of Cr, 0.003 to 0.08% of Sn, 0.003 to 0.06% of Sb, and a balance of Fe and inevitable impurities.
    The non-oriented electrical steel sheet according to an embodiment of the present invention includes a surface portion present from a surface of the steel sheet to 1/10 of a thickness of the steel sheet in a direction from the surface of the steel sheet toward an inside of the steel sheet, and a central portion, and when punching the non-oriented electrical steel sheet, a length of a plastically deformed portion may be 100 µm or less. In this case, the plastically deformed portion refers to a length of a portion from a punched end portion where hardness of the surface portion exceeds 1.10 times that of the central portion.