Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Hisashi Mogi

Fumiaki Takahashi

Masato Mizokami

Takahito Mizumura

Hideyuki Hamamura

Tatsuhiko Sakai

Masahiro Fujikura

Hirofumi Imai

Satoshi Arai

Shunsuke Okumura

Takeshi Kubota

Shuichi Yamazaki

Kenichi Murakami

Takeaki Wakisaka

Teruyuki Tamaki

Akira Sakaida

Masaru Takahashi

Hiroshi Fujimura

Takuya Matsumoto

Yoshiaki Natori

Katsuhiro Minamida

Naruhiko Nomura

Ryu Hirayama

Osamu Akisue

Yousuke Kurosaki

Norikazu Fujii

Tomoji Kumano

Kenji Kosuge

Naoya Hamada

Shinya Hayashi

Hotaka Honma

Norihiro Yamamoto

Takahide Shimazu

Tatsuya Takase

Masao Yabumoto

Shigenobu Koga

Kimihiko Sugiyama

Masataka Iwaki

Yoshifumi Ohata

Hitoshi Yokouchi

Junichi Takaobushi

Tomoji Shono

A wound core equipped with a laminated body including plural electrical steel sheets stacked in a ring shape in side view. The laminated body includes plural bent portions, and plural block-shaped portions at positions between adjacent bent portions. At least one bent portion among the plural bent portions is a high stacking factor bent portion, wherein a stacking factor of the electrical steel sheets at the high stacking bent portion is higher than an average stacking factor of the steel sheets at the plural block-shaped portions.

Wound core

The present invention provides a magnetic core and transformer which are reduced in core loss. The magnetic core according to the present invention comprises a core member which is formed by winding first electrical steel sheets, which is ring shaped seen from a side surface, and which has one or more bent parts seen from a side surface and one or more stacks of second electrical steel sheets stacked together, each the stack being arranged at least at one of the surfaces formed by side surfaces of the first electrical steel sheets at a bent part of the core member so that a surface formed by side surfaces of the second electrical steel sheets runs along it.

Magnetic core and transformer

When joining end faces of a plurality of soft magnetic sheets which are superposed in the sheet thickness direction and which are bent at parts forming corner areas of a core, offset of positions of the end faces from the desired positions is suppressed. In a region of a window part comprised of a region inside of a first partand second part, a third partwith a length in a longitudinal direction (X-axial direction) the same as a length in the X-axial direction of the window part at the position where the third partis arranged is arranged so as to contact the region of the inner circumferential surface between the first corner areaand third corner area

Magnetic core

The wound core of the present invention has at least one arbitrary bent regionA, in a plurality of corner portions (), in which the corner portion () bulges outward to confine the magnetic flux flowing in the wound core so that the angle θ formed by the straight line PQ and the straight line PR satisfies 23°≤θ≤50°.

Provided is a wound core formed by laminating a plurality of bent bodies obtained by forming a coated grain-oriented electrical steel sheet in which a coating is formed on at least one surface of a grain-oriented electrical steel sheet so that the coating is on an outside, in a sheet thickness direction, in which the bent body has a bent region obtained by bending the coated grain-oriented electrical steel sheet and a flat region adjacent to the bent region, the number of deformation twins present in the bent region in a side view is five or less per 1 mm of a length of a center line in the sheet thickness direction in the bent region, and when a region extending 40 times a sheet thickness to both sides in a circumferential direction from a center of the bent region on an outer circumferential surface of the bent body is defined as a strain affected region, a proportion of an area where the coating is not damaged at any position along the circumferential direction in a flat region within the strain affected region is 90% or more.

Wound core and method for producing same

A grain-oriented electrical steel sheet according to the present invention has a steel sheet surface provided with grooves and includes two or more broken lines including the grooves having a length of 5 to 10 mm on a straight line intersecting a rolling direction on the steel sheet surface. In each of the broken lines including the grooves, the grooves are arranged at equal intervals, and a ratio of the length of the groove to a length of a non-groove is in a range of 1:1 to 1.5:1.

Grain-oriented electrical steel sheet

Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. In a case where the steel sheet surface is seen from the sheet thickness direction, the steel sheet surface is provided with a groove group that is constituted by a plurality of the grooves arranged in a sheet width direction, the grooves, which constitute the groove group, are arranged in such a manner that adjacent grooves overlap each other on a projection plane perpendicular to the rolling direction, and a plurality of the groove groups are arranged with an interval in the rolling direction.

Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. An average depth D of the groove is greater than 10 &#x3bc;m and equal to or less than 40 &#x3bc;m in a case where the groove is seen on a groove-width-direction cross-section that is perpendicular to a groove extension direction, when a center of the groove in the groove width direction is defined as a groove width center, a deepest portion of the groove deviates from the groove width center toward one side in the groove width direction, and a cross-sectional shape of the groove is asymmetric with respect to the groove width center as a reference in the groove width direction.

A grain-oriented electrical steel sheet comprising a steel sheet having a surface on which grooves, in which an extending direction crosses a rolling direction and a depth direction is parallel to a sheet thickness direction, are formed, and wherein a molten solidified substance ranging in parallel to the groove exists on both sides of the groove on the surface of the steel sheet, and a height becoming a maximum frequency in a height distribution of height data in which the surface of the steel sheet in a specific area including the groove is measured at regular intervals is set as a virtual plane, and a value of V2/V1 is more than 0.10 and less than 0.80, wherein V1 is a space volume of recess parts recessed from the virtual plane and V2 is a volume of projection parts projected from the virtual plane.

Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. When an average value of a groove depth in a sheet thickness direction at a central portion of the groove in a longitudinal groove direction is set as an average groove depth D, a straight line, which connects a first point at which a groove depth in the sheet thickness direction becomes 0.05&#xd7;D and a second point at which the groove depth becomes 0.50&#xd7;D, at an inclined portion of the groove is set as a groove end straight line, an angle made by the steel sheet surface and the groove end straight line is set as a first angle &#x3b8;, and an average value of a groove-width-direction length, which is a length of a line segment connecting two points at which a groove depth in the sheet thickness direction in a contour of the groove on the groove-width-direction cross-section becomes 0.05&#xd7;D, is set as an average groove width W, an aspect ratio A obtained by dividing the average groove depth D by the average groove width W, and the first angle &#x3b8; satisfy the following Expression (1).&#x3b8;&#x3c;&#x2212;21&#xd7;+77&#x2003;&#x2003;(1)

Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. In a case where the groove is seen on a longitudinal groove cross-section including a groove extension direction and the sheet thickness direction, an arithmetic average height Ra of a roughness curve, which constitutes a contour of a groove bottom region of the groove, is 1 &#x3bc;m to 3 &#x3bc;m, and an average length RSm of a roughness curve element, which constitutes the contour of the groove bottom region, is 10 &#x3bc;m to 150 &#x3bc;m.

This oriented electrical steel sheet is a non-oriented electrical steel sheet consisting of, in mass %: C: not less than 0.0001% and not more than 0.0040%, Si: more than 3.0% and not more than 3.7%, sol.Al: not less than 0.3% and not more than 1.0%, Mn: not less than 0.5% and not more than 1.5%, Sn: not less than 0.005% and not more than 0.1%, Ti: not less than 0.0001% and not more than 0.0030%, S: not less than 0.0001% and not more than 0.0020%, N: not less than 0.0001% and not more than 0.003%, Ni: not less than 0.001% and not more than 0.2%, P: not less than 0.005% and not more than 0.05%, with a balance consisting of Fe and impurities, in which a resistivity &#x3c1; at room temperature &#x2267;60 &#x3bc;&#x3a9;cm, and saturation magnetic flux density Bs at room temperature &#x2267;1.945 T are established, and the components contained satisfy 3.5&#x2266;Si+(&#x2154;)&#xd7;sol.Al+(&#x2155;)&#xd7;Mn&#x2266;4.25.

Non-oriented electrical steel sheet and method of manufacturing non-oriented electrical steel sheet

A non-oriented electrical steel sheet contains Cr: 0.3 mass % to 5.3 mass %, Si: 1.5 mass % to 4 mass %, Al: 0.4 mass % to 3 mass %, and W: 0.0003 mass % to 0.01 mass %. A C content is 0.006 mass % or less, a Mn content is 1.5 mass % or less, a S content is 0.003 mass % or less, and a N content is 0.003 mass % or less, and the balance is composed of Fe and inevitable impurities.

Non-oriented electrical steel sheet

The present invention provides an electrical steel sheet core for a low-noise transformer capable of effectively lowering noise by suppressing vibration perpendicular to the surfaces of the steel sheets and reducing vibration, and relates to an electrical steel sheet for a low-noise transformer characterized by randomly inserting viscoelastic layers with both viscosity and elasticity into the gaps of the steel sheet lamination layers, and a low-noise transformer formed by using said electrical steel sheet.

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Yachiyo, Japan

Hisashi Mogi