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公开(公告)号：US20230243013A1
公开(公告)日：2023-08-03
申请号：US18009919
申请日：2021-06-23
Applicant: NIPPON STEEL CORPORATION
Inventor： Nobusato MORISHIGE , Kazumi MIZUKAMI , Ryutaro YAMAGATA , Takashi KATAOKA , Haruhiko ATSUMI , Daisuke ITABASHI , Junichi TAKAOBUSHI
IPC: C21D9/46 , C21D8/12 , C22C38/60 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , H01F1/147 , H01F41/00
CPC classification number: C21D9/46 , C21D8/1222 , C21D8/1233 , C21D8/1272 , C21D8/1283 , C21D8/1255 , C22C38/60 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/002 , C22C38/001 , C21D8/1261 , H01F1/14775 , H01F41/00 , C21D2201/05 , C22C2202/02
Abstract: A new and improved method for producing grain-oriented electrical steel sheet enabling production of grain-oriented electrical steel sheet realizing high magnetic flux density and excellent in magnetic characteristics, that is, as one aspect, a method for producing grain-oriented electrical steel sheet comprising a hot rolling process, cold rolling process, primary recrystallization annealing process, finish annealing process, and flattening annealing process, wherein shot blasting treatment and/or leveling treatment and treatment for contact with a solution are performed, the solution contains Cu etc. in a predetermined amount, the pH is −1.5 or more and less than 7, a solution temperature is 15° C. or more and 100° C. or less, and the time during which the steel sheet is dipped in the solution is 5 seconds or more and 200 seconds or less.
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公开(公告)号：US20230257841A1
公开(公告)日：2023-08-17
申请号：US18012830
申请日：2021-06-23
Applicant: NIPPON STEEL CORPORATION
Inventor： Nobusato MORISHIGE , Kazumi MIZUKAMI , Daisuke ITABASHI
CPC classification number: C21D8/1283 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/06 , C22C38/08 , C22C38/60 , C22C38/04 , C21D8/1222 , C21D8/1272 , C21D9/46
Abstract: A new and improved method for producing electrical steel sheet enabling production of electrical steel sheet excellent in magnetic characteristics and coating film adhesion, the method for producing electrical steel sheet containing a process of bringing an electrical steel sheet containing, by mass %, C: more than 0% and 0.10% or less, Si: 2.5% or more and 4.5% or less, Mn: 0.01% or more and 5.0% or less, a total of one or more of S, Se, and Te: more than 0% and 0.050% or less, acid soluble Al: more than 0% and 5.0% or less, N: more than 0% and 0.015% or less, and P: more than 0% and 1.0% or less and having a balance of Fe and impurities into contact with a solution, the solution containing one or more elements from among Cu, Hg, Ag, Pb, Cd, Co, Zn, and Ni, a total of concentrations of the elements being 0.00001% or more and 1.0000% or less.
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3.发明公开公开(公告)号：US20230392225A1
公开(公告)日：2023-12-07
申请号：US18269435
申请日：2022-03-31
Applicant: NIPPON STEEL CORPORATION
Inventor： Nobusato MORISHIGE , Takeru ICHIE , Masato YASUDA , Masahide URAGO , Fuminobu MURAKAMI , Daichi HAMADA , Atsushi SHIBAYAMA , Kazumi MIZUKAMI , Daisuke ITABASHI
CPC classification number: C21D8/1222 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/002 , C21D8/1233 , C21D8/1272 , C21D8/1277 , C21D9/46
Abstract: 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).
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