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.)

公开(公告)号：EP4455334A1

公开(公告)日：2024-10-30

申请号：EP22911926.8

申请日：2022-12-21

申请人： POSCO Co., Ltd

发明人： KWON, Soobin

IPC分类号： C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/34 ,  C21D8/12 ,  H01F1/147

摘要： A non-oriented electrical steel sheet according to one embodiment of the present invention comprises, in wt%, 2.0 to 6.5% of Si, 0.1 to 1.3% of Al, 0.3 to 2.0% of Mn, and the remainder in Fe and unavoidable impurities, and the area fraction of grains the diameters of which are at most 10% of the sheet thickness is 10.0 to 35.0%, while the number fraction is 15 to 55%.

公开(公告)号：EP4455335A1

公开(公告)日：2024-10-30

申请号：EP22911927.6

申请日：2022-12-21

申请人： POSCO Co., Ltd

发明人： KWON, Soobin ,  KIM, Yunsu

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

摘要： A non-oriented electrical steel sheet according to one embodiment of the present invention comprises a steel sheet base material and an insulation film positioned on the steel sheet base material, satisfies the following formula 2 before stress relief annealing, and satisfies the following formula 3 after stress relief annealing, the steel sheet base material comprising, by wt%, 2.0-6.5% of Si, 0.1-1.3% of Al, 0.3-2.0% of Mn, 0.03% or less of Sn (excluding 0%), 0.02% or less of Sb (excluding 0%) and the balance of Fe and other inevitable impurities and satisfying the following formula 1. 0.030 ≥ Sn + Sb ≥ 0.005 0.1 ≥ Mn film / Mn50 10 ≥ Mn film / Mn50 ≥ 1 (In formula 1 to formula 3, [Sn] and [Sb] represent the amounts of Sn and Sb, respectively, [Mn film] represents the average amount (wt%) of Mn in the insulation film, and [Mn50] represents the amount (wt%) of Mn at a depth of 50 µm from the interface between the steel sheet base material and the insulation film toward the inside of the steel sheet base material.)