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公开(公告)号：US20230243010A1
公开(公告)日：2023-08-03
申请号：US18008927
申请日：2021-06-23
IPC分类号： C21D8/12 , C22C38/02 , C22C38/04 , C22C38/60 , C22C38/06 , C22C38/00 , C22C38/16 , C21D9/46 , C21D3/04
CPC分类号： C21D8/1283 , C22C38/02 , C22C38/04 , C22C38/60 , C22C38/06 , C22C38/001 , C22C38/16 , C21D9/46 , C21D3/04 , C21D8/1222 , C22C38/002 , C21D8/1272 , C21D2201/05
摘要： Provided is a production method for a grain-oriented electrical steel sheet that is thin and has excellent magnetic characteristics. An embodiment of the present invention provides a production method that is for a grain-oriented electrical steel sheet and that comprises: a hot rolling step; an optional hot-rolled sheet-annealing step; an acid-washing step; a cold rolling step; a primary recrystallization-annealing step; a finishing-annealing step; and a planarization-annealing step. In the acid-washing step, an acid-washing solution containing 0.0001-5.00 g/L of Cu is used. The thickness of a cold-rolled steel sheet is 0.15-0.23 mm. The average temperature increase rate in the temperature range of 30-400° C. in a temperature increase process in the primary recrystallization step is more than 50° C./sec but not more than 1000° C./sec.
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公开(公告)号：US20230002849A1
公开(公告)日：2023-01-05
申请号：US17901936
申请日：2022-09-02
IPC分类号： C21D9/46 , C22C38/16 , C22C38/04 , C22C38/02 , C22C38/00 , C22C38/06 , C22C38/60 , C21D8/12 , C21D6/00 , H01F1/147
摘要： Grain-oriented electrical steel sheet excellent in magnetic properties and adhesion of a primary coating to a base steel sheet and with few defects where the base metal is exposed in point defects and a method for manufacturing grain-oriented electrical steel sheet are provided. This is characterized by being provided with a base steel sheet and a primary coating. The primary coating satisfies (1) Number density D3 of Al concentrated regions: 0.015 to 0.150/μm2 (2) (Area S5 of regions comprised of anchoring oxide layer regions and Al concentrated regions)/(area S3 of Al concentrated regions)≥0.30, (3) Distance H5 of mean value of heights in thickness direction of regions of comprised of anchoring oxide layer regions and Al concentrated regions minus HO: 0.4 to 4.0 μm, (4) (Perimeter L5 of regions comprised of anchoring oxide layer regions and Al concentrated regions)/(observed area S0): 0.020 to 0.500 μm/μ2, and (5) (Area S1 of anchoring oxide layer regions)/(observed area S0)≥0.15.
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3.发明公开公开(公告)号：US20230160034A1
公开(公告)日：2023-05-25
申请号：US18096276
申请日：2023-01-12
IPC分类号： C21D9/46 , C21D3/04 , C21D6/00 , C21D8/00 , C21D8/12 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/16 , H01F1/147
CPC分类号： C21D9/46 , C21D3/04 , C21D6/005 , C21D6/008 , C21D8/005 , C21D8/1233 , C21D8/1255 , C21D8/1272 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/008 , C22C38/16 , H01F1/147 , C22C2202/02
摘要： Grain-oriented electrical steel sheet excellent in magnetic properties and excellent in adhesion of a primary coating to the steel sheet is provided. The grain-oriented electrical steel sheet is provided with a base steel sheet having a chemical composition containing C: 0.005% or less, Si: 2.5 to 4.5%, Mn: 0.050 to 1.000%, a total of S and Se: 0.005% or less, sol. Al: 0.005% or less, and N: 0.005% or less and having a balance of Fe and impurities and a primary coating having Mg2 SiO4 as a main constituent formed on a surface of the base steel sheet. A peak position of Al emission intensity obtained when conducting elemental analysis by glow discharge spectrometry from a surface of the primary coating in a thickness direction is present in a range of 2.0 to 12.0 µm from a surface of the primary coating to the thickness direction. A sum of perimeters of the Al oxides at the peak position of Al emission intensity is 0.20 to 1.00 µm/µm2, and a number density of Al oxides is 0.02 to 0.20 /µm2.
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公开(公告)号：US20220344084A1
公开(公告)日：2022-10-27
申请号：US17761092
申请日：2020-09-16
发明人： Takashi KATAOKA , Ichiro TANAKA , Haruhiko ATSUMI , Kazutoshi TAKEDA , Ryutaro YAMAGATA , Nobusato MORISHIGE
IPC分类号： H01F1/147 , C22C38/28 , C22C38/20 , C22C38/06 , C22C38/04 , C22C38/34 , C22C38/00 , C21D9/46 , C21D8/12 , C21D8/00 , C21D6/00 , C21D3/04
摘要： A grain oriented electrical steel sheet includes a base steel sheet, a glass film, and a tension-insulation coating. When a glow discharge emission spectroscopy is conducted from a surface of the glass film toward a depth direction, an analysis starting time Ts, a time TAlp at which Al shows a maximum emission intensity, an Al emission intensity F(TAlp) at the TAlp, a time TSip at which Si shows a maximum emission intensity, and an Al emission intensity F(TSip) at the TSip satisfy 0.05≤F(TSip)/F(TAlp)≤0.50 and 2.0≤(TAlp−Ts)/(TSip−Ts)≤5.0.
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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
发明人： Nobusato MORISHIGE , Kazumi MIZUKAMI , Ryutaro YAMAGATA , Takashi KATAOKA , Haruhiko ATSUMI , Daisuke ITABASHI , Junichi TAKAOBUSHI
IPC分类号： C21D9/46 , C21D8/12 , C22C38/60 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , H01F1/147 , H01F41/00
CPC分类号： 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
摘要： 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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6.发明申请公开(公告)号：US20220098688A1
公开(公告)日：2022-03-31
申请号：US17421562
申请日：2020-01-08
IPC分类号： C21D9/46 , C22C38/16 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D8/12 , C21D8/00 , C21D6/00 , C21D3/04 , H01F1/147
摘要： Grain-oriented electrical steel sheet excellent in magnetic properties and excellent in adhesion of a primary coating to the steel sheet is provided. The grain-oriented electrical steel sheet is provided with a base steel sheet having a chemical composition containing C: 0.005% or less, Si: 2.5 to 4.5%, Mn: 0.050 to 1.000%, a total of S and Se: 0.005% or less, sol. Al: 0.005% or less, and N: 0.005% or less and having a balance of Fe and impurities and a primary coating having Mg2 SiO4 as a main constituent formed on a surface of the base steel sheet. A peak position of Al emission intensity obtained when conducting elemental analysis by glow discharge spectrometry from a surface of the primary coating in a thickness direction is present in a range of 2.0 to 12.0 μm from a surface of the primary coating to the thickness direction. A sum of perimeters of the Al oxides at the peak position of Al emission intensity is 0.20 to 1.00 μm/μm2, and a number density of Al oxides is 0.02 to 0.20/μm2.
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公开(公告)号：US20220002831A1
公开(公告)日：2022-01-06
申请号：US17421309
申请日：2020-01-08
发明人： Nobusato MORISHIGE , Ryutaro YAMAGATA , Ichiro TANAKA , Takashi KATAOKA , Haruhiko ATSUMI , Yoshihiro SUWA , Kazumi MIZUKAMI
IPC分类号： C21D9/46 , C21D8/12 , C21D8/00 , C21D6/00 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , H01F1/147
摘要： Grain-oriented electrical steel sheet excellent in coating adhesion and magnetic properties is provided. The method for manufacturing grain-oriented electrical steel sheet excellent in coating adhesion and magnetic properties 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 so as to obtain hot rolled steel sheet, a process, after hot rolling annealing the hot rolled steel sheet, of cold rolling it one time or cold rolling it two times or more with process annealing performed interposed so as to obtain cold rolled steel sheet, 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 containing predetermined compounds including 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.
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公开(公告)号：US20220119904A1
公开(公告)日：2022-04-21
申请号：US17421232
申请日：2020-01-08
发明人： Ryutaro YAMAGATA , Ichiro TANAKA
摘要： Grain-oriented electrical steel sheet excellent in magnetic properties and excellent in adhesion of the primary coating to the steel sheet is provided. The grain-oriented electrical steel sheet according to the present invention is provided with a base metal steel sheet containing a chemical composition containing, by mass %, C: 0.005% or less, Si: 0.5 to 7.0%, Mn: 0.05 to 1.00%, a total of S and Se: 0.005% or less, sol. Al: 0.005% or less, and N: 0.005% or less and having a balance comprised of Fe and impurities and with a primary coating formed on a surface of the base metal steel sheet and containing Mg2SiO4as a main constituent, wherein a peak position of Al emission intensity obtained when performing elemental analysis by glow discharge optical emission spectrometry from a surface of the primary coating in a thickness direction of the grain-oriented electrical steel sheet is arranged within a range of 2.0 to 12.0 μm from the surface of the primary coating in the thickness direction, and a number density of Al oxides of a size of 0.1 μm or more in terms of a circle equivalent diameter based on the area at the peak position of Al emission intensity is 0.03 to 0.2/μm2.
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公开(公告)号：US20220081743A1
公开(公告)日：2022-03-17
申请号：US17421338
申请日：2020-01-08
摘要： Grain-oriented electrical steel sheet excellent in magnetic properties and adhesion of a primary coating to a base steel sheet and with few defects where the base metal is exposed in point defects and a method for manufacturing grain-oriented electrical steel sheet are provided. This is characterized by being provided with a base steel sheet and a primary coating. The primary coating satisfies (1) Number density D3 of Al concentrated regions: 0.015 to 0.150/μm2, (2) (Area S5 of regions comprised of anchoring oxide layer regions and Al concentrated regions)/(area S3 of Al concentrated regions)≥0.30, (3) Distance H5 of mean value of heights in thickness direction of regions of comprised of anchoring oxide layer regions and Al concentrated regions minus H0: 0.4 to 4.0 μm, (4) (Perimeter L5 of regions comprised of anchoring oxide layer regions and Al concentrated regions)/(observed area S0): 0.020 to 0.500 μm/μm2, and (5) (Area S1 of anchoring oxide layer regions)/(observed area S0)≥0.15.
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公开(公告)号：US20220064764A1
公开(公告)日：2022-03-03
申请号：US17421327
申请日：2020-01-08
发明人： Ryutaro YAMAGATA , Ichiro TANAKA
摘要： Grain-oriented electrical steel sheet excellent in magnetic properties and excellent in adhesion of primary coating to steel sheet provided with a base metal steel sheet having a predetermined chemical composition and a primary coating formed on a surface of the base metal steel sheet and containing Mg2SiO4 as a main constituent, where a peak position of Al emission intensity obtained when performing elemental analysis by glow discharge optical emission spectrometry from a surface of the primary coating in a thickness direction of the grain-oriented electrical steel sheet is arranged within a range of 2.4 to 12.0 μm from the surface of the primary coating in the thickness direction, a number density of Al oxides at the peak position of Al emission intensity and of a size of 0.2 μm or more in terms of a circle equivalent diameter based on the area is 0.03 to 0.18/μm2, and, in a plurality of Al oxides in an observed region in an observed region of 30 μm×50 μm at the peak position of Al emission intensity, a total cross-sectional area of identified Al oxides with cross-sectional areas of 0.4 to 10.0 μm2 is 75.0% or more of the total cross-sectional area of all Al oxides in the observed region.
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