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公开(公告)号：EP3913080A1
公开(公告)日：2021-11-24
申请号：EP20741132.3
申请日：2020-01-16
摘要： The grain-oriented electrical steel sheet according to the present embodiment is a grain-oriented electrical steel sheet having a base steel sheet (1), an intermediate layer (4) disposed to be in contact with the base steel sheet (1), and an insulation coating (3) disposed to be in contact with the intermediate layer (4). The grain-oriented electrical steel sheet according to the present embodiment includes a surface of the base steel sheet (1) having a strain region (D) which extends in a direction intersecting a rolling direction of the base steel sheet (1), and a crystalline phosphorus oxide M 2 P 4 O 13 present in the insulation coating (3) on the strain region (D) in a cross-sectional view of a surface parallel to the rolling direction and a sheet thickness direction of the base steel sheet (1). (M means at least one or both of Fe and Cr.)
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52.发明公开
公开(公告)号：EP3913072A1
公开(公告)日：2021-11-24
申请号：EP20738731.7
申请日：2020-01-08
发明人： MORISHIGE, Nobusato , YAMAGATA, Ryutaro , TANAKA, Ichiro , KATAOKA, Takashi , ATSUMI, Haruhiko , SUWA, Yoshihiro , MIZUKAMI, Kazumi
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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53.发明公开
公开(公告)号：EP3910081A1
公开(公告)日：2021-11-17
申请号：EP20738994.1
申请日：2020-01-08
发明人： TANAKA, Ichiro , YAMAGATA, Ryutaro , MORISHIGE, Nobusato , KATAOKA, Takashi , TAKAHASHI, Masaru
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 Mg 2 SiO 4 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/µm 2 , and a number density of Al oxides is 0.02 to 0.20/µm 2 .
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公开(公告)号：EP3904551A1
公开(公告)日：2021-11-03
申请号：EP19906231.6
申请日：2019-08-27
摘要： In a production of a non-oriented electrical steel sheet by subjecting a slab containing, in mass%, C: not more than 0.0050%, Si: 2.8 to 6.5%, Mn: 0.05 to 2.0%, P: not more than 0.10%, S: not more than 0.0050%, Al: 0.3 to 2.0%, N: not more than 0.0050% and Zn: 0.0005 to 0.0050% to a hot rolling, a hot-band annealing, a cold rolling and a finish annealing, a dew point in the hot-band annealing is set to 0 to 70 °C and an atmosphere of the finish annealing has a nitrogen content of not more than 30 vol% and a dew point of not higher than - 20°C, and a ratio of the amount of nitrogen present as AlN in an entire sheet thickness to the amount of nitrogen present as AlN in a layer from one-side surface of steel sheet to a depth of 1/20 of sheet thickness is made to not less than 5.0, whereby a non-oriented electrical steel sheet having high magnetic flux density and a low iron loss at a high frequency is obtained without decreasing the magnetic flux density and decreasing the productivity.
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公开(公告)号：EP3725905B1
公开(公告)日：2021-08-25
申请号：EP18887312.9
申请日：2018-12-10
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56.发明公开
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公开(公告)号：EP3859037A1
公开(公告)日：2021-08-04
申请号：EP19865506.0
申请日：2019-09-27
申请人： POSCO
发明人： KIM, Jae-Hoon , KIM, Yong-Soo , SHIN, Su-Yong
IPC分类号： C22C38/02 , C22C38/06 , C22C38/04 , C22C38/00 , C22C38/14 , C22C38/12 , C21D8/12 , H01F1/147
摘要： The present invention relates to a non-grain-oriented electrical steel sheet which is excellent in high-frequency iron loss, and a manufacturing method thereof.
A non-grain-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes 2.5 to 3.8 wt% of Si, 0.5 to 2.5 wt% of Al, 0.2 to 4.5 wt% of Mn, 0.0005 to 0.02 wt% of As, 0.0005 to 0.01 wt% of Bi, the balance Fe, and inevitable impurities, and satisfies the following [Equation 1]. 0.3 ≤ surface fine crystal grain diameter × fine grain formation thickness × As / Bi ≤ 5.0
In Equation 1, [surface fine crystal grain diameter] means an average particle diameter (µm) of fine crystal grains in an electrode surface layer of an electrical steel sheet, [fine grain formation thickness] means a thickness (mm) of an electrode surface layer in which fine crystal grains are formed, and [As] and [Bi] mean a composition (wt%) of As and a composition (wt%) of Bi, respectively.-
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公开(公告)号：EP3831974A1
公开(公告)日：2021-06-09
申请号：EP19843927.5
申请日：2019-07-31
摘要： A grain oriented electrical steel sheet includes the texture aligned with Goss orientation. In the grain oriented electrical steel sheet, when (α 1 β 1 γ 1 ) and (α 2 β 2 γ 2 ) represent deviation angles of crystal orientations measured at two measurement points which are adjacent on the sheet surface and which have an interval of 1 mm, the boundary condition BA is defined as [(α 2 - α 1 ) 2 + (β 2 - β 1 ) 2 + (γ 2 - γ 1 ) 2 ] 1/2 ≥ 0.5°, and the boundary condition BB is defined as [(α 2 - α 1 ) 2 + (β 2 - β 1 ) 2 + (γ 2 - γ 1 ) 2 ] 1/2 ≥ 2.0°, the boundary which satisfies the boundary condition BA and which does not satisfy the boundary condition BB is included.
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公开(公告)号：EP3822385A1
公开(公告)日：2021-05-19
申请号：EP18926049.0
申请日：2018-07-13
摘要： A grain oriented electrical steel sheet includes: by mass%, 0.010% or less of C; 2.50 to 4.00% of Si; 0.0010 to 0.0100% of acid soluble Al; 0.012% or less of N; 1.00% or less of Mn; 0.02% or less of S; and a balance consisting of Fe and impurities, and has a tension-insulation coating at steel sheet surface and a SiO 2 intermediate oxide film layer with an average thickness of 1.0 nm to 1.0 µm at an interface between the tension-insulation coating and the steel sheet surface. In the grain oriented electrical steel, a time differential curve f M (t) of a glow discharge optical emission spectrum of a metallic element M (Al) in the SiO 2 intermediate oxide film layer satisfies a predetermined condition.
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