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公开(公告)号：US20220340991A1
公开(公告)日：2022-10-27
申请号：US17761055
申请日：2020-09-17
Applicant: NIPPON STEEL CORPORATION
Inventor： Masato YASUDA , Takeo ARAMAKI , Shinya YANO , Yoshihiro ARITA , Takashi KATAOKA , Kenichi MURAKAMI
IPC: C21D9/46 , C22C38/34 , C22C38/16 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/00 , C21D8/12 , C21D8/00 , C21D6/00 , H01F1/147
Abstract: [Problem] To provide a grain-oriented electrical steel sheet which is further improved in terms of iron loss before magnetic domain control, while achieving a sufficient iron loss improvement effect even in the control of a heat-resistant magnetic domain where a sufficient iron loss improvement effect has not been achieved. [Solution] A grain-oriented electrical steel sheet according to one aspect of the present invention comprises abase steel sheet and a glass coating that is formed on the surface of the base steel sheet, and is characterized in that: the base steel sheet contains as chemical components, in mass %, 0.010% or less of C, from 2.00% to 4.00% of Si, from 0.05% to 1.00% of Mn, from 0.010% to 0.065% of Al, 0.004% or less of N and 0.010% or less of S, with the balance being made up of Fe and impurities; the oxygen concentration in the glass coating and the base steel sheet is 2,500 ppm or less; and if IAl_1 is the first peak intensity of Al and IAl_2 is the second peak intensity of Al in the concentration profile of Al, the relationship of mathematical formula (1) is satisfied. IAl_1
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公开(公告)号：US20230402220A1
公开(公告)日：2023-12-14
申请号：US18033090
申请日：2021-10-26
Applicant: NIPPON STEEL CORPORATION
Inventor： Yoshiyuki USHIGAMI , Shinji YAMAMOTO , Takeo ARAMAKI , Yuki KUNITA , Satoshi ARAI
IPC: H01F27/245 , C22C38/02 , H01F1/147
CPC classification number: H01F27/2455 , C22C38/02 , H01F1/14783
Abstract: This wound core is a wound core including: a substantially rectangular wound core main body in a side view in which first planar portions and corner portions are alternately continuous and at least one of two or more bent portions existing in at least one corner portion satisfies Equations (1) to (3) below.
Tave≤40 nm (1)
(To−Tu)/Tave≤0.50 (2)
Tave(To−Tu)≤240 nm2 (3)-
公开(公告)号：US20220341009A1
公开(公告)日：2022-10-27
申请号：US17761043
申请日：2020-09-17
Applicant: NIPPON STEEL CORPORATION
Inventor： Masato YASUDA , Yoshihiro ARITA , Takashi KATAOKA , Kenichi MURAKAMI , Takeo ARAMAKI , Shinya YANO
Abstract: The purpose of the present invention is to provide a method for manufacturing a grain-oriented electrical steel sheet, whereby it becomes possible to manufacture a grain-oriented electrical steel sheet having further improved iron loss properties stably. (Solution) According to one aspect of the present invention, a method for manufacturing a grain-oriented electrical steel sheet is provided, the method being characterized by comprising a re-heating step, a hot rolling step, a hot-rolled sheet annealing step, a cold rolling step, a decarburization annealing step and a final annealing step, wherein the decarburization annealing step includes a heating step of heating a cold-rolled sheet from an inlet side temperature T0° C. to a soaking temperature T2° C. and a soaking step of keeping the temperature of the cold-rolled sheet at the soaking temperature T2° C., and the heating rate HR1 from the time point when the temperature of the cold-rolled sheet is an inlet side temperature T0° C. to the time point when the temperature of the cold-rolled sheet reaches a attained temperature T1° C. is 40° C./sec or more and the heating rate HR2 from the time point when the temperature of the cold-rolled sheet is the desired temperature T1° C. to the time point when the temperature of the cold-rolled sheet reaches the soaking temperature T2° C. is more than 15° C./sec to 30° C./sec in the heating in the decarburization annealing step.
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公开(公告)号：US20220127692A1
公开(公告)日：2022-04-28
申请号：US17424079
申请日：2020-01-28
Applicant: NIPPON STEEL CORPORATION
Inventor： Satoshi ARAI , Masataka IWAKI , Masato MIZOKAMI , Hideyuki HAMAMURA , Takeo ARAMAKI , Hirotoshi TADA
Abstract: A grain-oriented electrical steel sheet includes: a steel sheet and optionally an insulation coating formed on the steel sheet, in which, in a case where a heat treatment of performing retention at 800° C. for 2 hours is performed, regarding a time-magnetostriction waveform (t−λ waveform) when magnetized to 1.7 T, a peak value of a difference waveform obtained by subtracting the time-magnetostriction waveform after the heat treatment from the time-magnetostriction waveform before the heat treatment is 0.01×10−6 or more and 0.20×10−6 or less, and a difference obtained by subtracting an iron, loss before the heat treatment from an iron loss after the heat treatment is 0.03 W/kg or more and 0.17 W/kg or less.
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