公开(公告)号：US12091722B2

公开(公告)日：2024-09-17

申请号：US17421309

申请日：2020-01-08

申请人： NIPPON STEEL CORPORATION

发明人： Nobusato Morishige ,  Ryutaro Yamagata ,  Ichiro Tanaka ,  Takashi Kataoka ,  Haruhiko Atsumi ,  Yoshihiro Suwa ,  Kazumi Mizukami

IPC分类号： C22C38/00 ,  C21D6/00 ,  C21D8/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  H01F1/147 ,  H01F1/18

CPC分类号： C21D9/46 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1272 ,  C21D8/1283 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  H01F1/147 ,  H01F1/18 ,  C22C2202/02

摘要： Grain-oriented electrical steel sheet and its method of manufacture are provided. The method includes a process of heating to 1280° C. or more and hot rolling a slab containing, by mass %, Bi and a predetermined composition of constituents and having a balance of Fe and impurities to obtain hot rolled steel sheet. After hot rolling annealing, the hot rolled steel sheet is cold rolled one time or more with process annealing performed interposed so as to obtain cold rolled steel sheet, followed by a process of rapidly heating then decarburization annealing the steel sheet, a process of coating the surface of the cold rolled steel sheet after decarburization annealing with an annealing separator comprising sulfates or sulfides and having MgO as its main constituent, then performing finish annealing, a process of performing strictly controlled finish annealing, and a process of coating an insulating coating, then performing flattening annealing.

公开(公告)号：US11970750B2

公开(公告)日：2024-04-30

申请号：US18269435

申请日：2022-03-31

申请人： NIPPON STEEL CORPORATION

发明人： Nobusato Morishige ,  Takeru Ichie ,  Masato Yasuda ,  Masahide Urago ,  Fuminobu Murakami ,  Daichi Hamada ,  Atsushi Shibayama ,  Kazumi Mizukami ,  Daisuke Itabashi

IPC分类号： C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

CPC分类号： C21D8/1222 ,  C21D8/1233 ,  C21D8/1272 ,  C21D8/1277 ,  C21D9/46 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

摘要： There is provided a non-oriented electrical steel sheet in which, in a cross section of a base material in a sheet thickness direction, the number density N2-5 of precipitates with an equivalent circle diameter of 50 to 500 nm present in a range of 2.0 to 5.0 μm from the surface of the base material in the sheet thickness direction is 0.30 pieces/μm2 or less, and the relationship between the number density N2-5 and the number density N0-2 of precipitates with an equivalent circle diameter of 50 to 500 nm present in a range from the surface of the base material to 2.0 μm satisfies Formula (1):

(N2-5)/(N0-2)≤0.5  Formula (1).