Canon Kabushiki Kaisha

Jfe Steel Corporation

Kabushiki Kaisha Toshiba

International Business Machines Corporation

Toshiba Memory Corporation

Casio Computer Co., Ltd.

Kawasaki Steel Corporation

Nippon Shinyaku Company, Ltd.

Raito Kogyo Co., Ltd.

Ginza Maronie P.c.

Takeshi Imamura

Tetsuya Yano

Tsutomu Honma

Takashi Kenmoku

Etsuko Sugawa

Shinya Kozaki

Sakae Suda

Tsuyoshi Nomoto

Shin Kobayashi

Yasuyuki Hayakawa

Hidenori Shiotsuka

Tatsuki Fukui

Ryuichi Suehiro

Masanori Takenaka

Tomohiro Suzuki

Seiji Okabe

Minoru Takashima

Yukihiro Shingaki

Yoshiaki Fukuzumi

Kinya Kato

Toshito Takamiya

Hideaki Aochi

Chieko Mihara

Akira Kuriyama

Masanori Sakuranaga

Miki Ogawa

Toyoko Kobayashi

Yuji Kawabata

Izumi Kumagai

Masaru Kito

Makoto Watanabe

Mitsumasa Kurosawa

Yuiko Ehashi

Yasutsugu Yamada

Kenichi Fujii

Ryouhei Kirisawa

Tomoko Fujiwara

Osamu Matsuura

Takeo Yamazaki

Kazuhiro Ban

Hideki Inokuma

Genki Kawaguchi

Satoshi Makino

Hideo Wada

Hajime Kaneko

Kaori Kawasaki

Toshiyuki Komatsu

Michiaki Tatsubori

Tadashi Okamoto

Akira Koseki

Hiroyuki Hashimoto

Norihiko Utsunomiya

Takayuki Itoh

Masahiro Kawaguchi

Kazumichi Nakahama

Masanori Uesaka

Manabu Komatsu

Hiroshi Maruyama

Tatsuhiko Hiratani

Yoichiro Handa

Masayoshi Teraguchi

Junta Yamamichi

Fumiko Satoh

Satoru Nishiuma

Naohiko Shimura

Satoshi Sato

Katsuaki Kuge

Yuhichi Nakamura

Kumi Nakamura

Yuiko Wakisaka

Yumi Yamaguchi

Masanari Fujita

Hiroshi Suzuki

Takashi Ikeda

Toru Nakakubo

Katsumi Yamada

Jun Fujiki

Daisuke Matsushita

Yoshifumi Nishi

Atsunori Terasaki

Takashi Terashima

Shigehiro Takajo

Susumu Yasuda

Takayuki Fukunaga

Masato Minami

Hiroi Yamaguchi

Hidenori Miyagawa

Kohei Miyazono

Toshiro Takase

Yoshiyuki Toge

Tetsunori Ojima

James Andrew Clark

Yoshihiko Kikuchi

Tsuneo Uenaka

Yoshiyuki Touge

Noriko Makiishi

Takahiro Ezaki

Shingo Maeda

Satoru Hatakeyama

In a production of a grain-oriented electrical steel sheet comprising hot rolling a raw steel material, cold rolling, decarburization annealing, applying an annealing separator composed mainly of MgO, finish annealing and magnetic domain subdividing, the annealing separator including certain compounds, and the finish annealing conducted by holding the steel sheet at a temperature of 800 to 950° C. for 10 to 100 hours and passing a dry gas containing not less than 1 vol % of Hand having a dew point of not higher than 10° C. to reach a furnace pressure of not less than 3.5 mmHO from not lower than 1050° C. to a purification treatment temperature, so that a pickling weight loss of undercoat film by pickling with HCl is not more than 1.8 g/mand the total concentration of Sn, Sb, Mo, and W on a boundary face between the film and iron matrix is 0.01 to 0.15 mass %.

Grain-oriented electrical steel sheet and method for producing same

Provided is a method for manufacturing a grain-oriented electrical steel sheet. A steel slab having a specific chemical composition is heated and hot rolled. A hot-rolled steel sheet thus obtained is subjected to hot band annealing to obtain a cold-rolled steel sheet, which is then subjected to primary recrystallization annealing to obtain a primary recrystallized steel sheet. An annealing separator is applied to the primary recrystallized steel sheet, which is then coiled. The coil is subjected to secondary recrystallization annealing to obtain a grain-oriented electrical steel sheet having an average value of a deviation angle (α+β)calculated from a deviation angle α from ideal Goss orientation around an ND rotation axis and a deviation angle β from ideal Goss orientation around a TD rotation axis of 4.5° or less, and an area ratio Rof crystal grains with β≤0.50° of 15% or less.

Method for manufacturing a grain-oriented electrical steel sheet

Provided are a grain-oriented electrical steel sheet having excellent iron loss property without using magnetic domain refining treatment and an iron core produced using the same. The steel sheet comprises: a predetermined chemical composition; and a steel microstructure in which: crystal grains are made up of coarse secondary recrystallized grains of 5.0 mm or more, fine grains of more than 2.0 mm and less than 5.0 mm contained at a frequency of 0.2 to 5 grains per cm, and very fine grains of 2.0 mm or less; for each coarse secondary recrystallized grain extending through the sheet in a thickness direction, an area ratio of a region in which projected surfaces of exposed areas of the coarse secondary recrystallized grain on a front side and a back side of the sheet coincide with each other to each of the exposed areas is 95% or more.

Grain-oriented electrical steel sheet and iron core using same

With a hot-rolled steel sheet for electrical steel sheet production having a scale layer on the surface, where the surface of the steel sheet has a lightness L* as defined in JIS Z 8781-4: 2013 satisfying 30&#x2264;L*&#x2264;50, and chromaticities a* and b* as defined in JIS Z 8781-4: 2013 satisfying &#x2212;1&#x2264;a*&#x2264;2 and &#x2212;5&#x2264;b*&#x2264;3 respectively, and with one end portion in the longitudinal direction of a coil as a reference, a color difference &#x394;E* as defined in JIS Z 8781-4: 2013 at the central portion and at the opposite end portion satisfies &#x394;E*&#x2264;8, it is possible to obtain a grain-oriented electrical steel sheet where the variation of properties in a product coil is small.

Hot-rolled steel sheet for electrical steel sheet production and method of producing same

Provided is a grain-oriented electrical steel sheet that has excellent magnetic properties and can be manufactured by secondary recrystallization orientation control using coil annealing with high productivity. A grain-oriented electrical steel sheet comprises a specific chemical composition, wherein an average value of a deviation angle (&#x3b1;+&#x3b2;)calculated from a deviation angle &#x3b1; from ideal Goss orientation around an ND rotation axis and a deviation angle &#x3b2; from ideal Goss orientation around a TD rotation axis is 5.0&#xb0; or less, and an area ratio Rof crystal grains with &#x3b2;&#x2264;0.50&#xb0; is 20% or less.

Grain-oriented electrical steel sheet and method for manufacturing same

Disclosed is a grain-oriented electrical steel sheet that has excellent high-frequency iron loss properties and blanking workability. The steel sheet includes: steel components including, by mass %, Si: 1.5-8.0%, Mn: 0.02-1.0%, and at least one selected from Sn: 0.010-0.400%, Sb: 0.010-0.400%, Mo: 0.010-0.200%, and P: 0.010-0.200%; and crystal grains including coarse secondary recrystallized grains having an average grain size of 5 mm or more and fine grains having a grain size of 0.1-2.0 mm, wherein at least some of the coarse secondary recrystallized grains penetrate the steel sheet in a thickness direction and are respectively exposed on front and back surfaces of the steel sheet such that projection planes of the exposed surfaces of these coarse secondary recrystallized grains on the front and back surfaces form an overlapping region, and the fine grains are present at a number density per unit area of 0.6-40 pieces/cm.

Grain-oriented electrical steel sheet

To provide a grain-oriented electrical steel sheet that has better magnetic property than conventional ones without requiring high-temperature slab heating, in the case of not performing intermediate annealing, the hot rolled steel sheet obtained by a predetermined step is subjected to hot band annealing, and, in a heating process in the hot band annealing, heating is performed at a heating rate of 10&#xb0; C./s or less for 10 sec or more and 120 sec or less in a temperature range of 700&#xb0; C. or more and 950&#xb0; C. or less, and in the case of performing the intermediate annealing, in a heating process in final intermediate annealing, heating is performed at a heating rate of 10&#xb0; C./s or less for 10 sec or more and 120 sec or less in a temperature range of 700&#xb0; C. or more and 950&#xb0; C. or less.

Method of producing grain-oriented electrical steel sheet

In a grain-oriented electrical steel sheet which is manufactured from a thin slab without using an inhibitor forming component, excellent magnetic properties are stably achieved. In a method for manufacturing a grain-oriented electrical steel sheet, a slab heating and annealing are performed under specific conditions.

Method for manufacturing grain-oriented electrical steel sheet

There is provided an amorphous alloy thin strip having a chemical composition represented by a chemical formula: FeBSi(x: 78-83 at %, y: 8-15 at % and z: 6-13 at %) capable of stably attaining a low iron loss even when shaped into a wound core, wherein a generation density of air pockets on a face contacting with a cooling roll is not more than 8 per 1 mmand an arithmetic mean height Sa on portions other than the air pockets is not more than 0.3 &#x3bc;m.

Amorphous alloy thin strip

In the production of a grain-oriented electrical steel sheet by hot rolling a slab containing Si: 2.0-8.0 mass % and no inhibitor-forming ingredients, cold rolling, subjecting to a decarburization annealing, applying an annealing separator composed mainly of MgO and containing a Ti compound(s) and subjecting to a finish annealing, an atmosphere in the heating process of the decarburization annealing is rendered into a dry atmosphere having a dew point of not higher than 0&#xb0; C. and a Ti amount (Ti(a)) and a N amount (N(a)) contained in an iron matrix after the removal of a forsterite coating and a Ti amount (Ti(b)) and a N amount (N(b)) contained in the steel sheet having a forsterite coating are made to satisfy relationships as N(b)&#x2264;0.0050 mass %, N(b)/N(a)&#x2265;4, and Ti(b)/Ti(a)&#x2265;4.

Grain-oriented electrical steel sheet and method for producing the same

To provide a grain-oriented electrical steel sheet that has better magnetic property than conventional ones, in hot band annealing of the hot rolled steel sheet obtained by a predetermined step, an average heating rate from ordinary temperature to 400&#xb0; C. is set to 50&#xb0; C./s or more, and a time to reach 900&#xb0; C. from 400&#xb0; C. is set to 100 sec or less.

Provided are a grain-oriented electrical steel sheet with low iron loss even when including at least one grain boundary segregation element among Sb, Sn, Mo, Cu, and P, and a method for manufacturing the same. In our method, Pr is controlled to satisfy Pr&#x2264;&#x2212;0.075T+18, where T&#x3e;10, 5&#x3c;Pr, T (hr) is the time required after final annealing to reduce the temperature of a secondary recrystallized sheet from 800&#xb0; C. to 400&#xb0; C., and Pr (MPa) is the line tension on the secondary recrystallized sheet during flattening annealing. As a result, a grain-oriented electrical steel sheet in which iron loss is low and a dislocation density near crystal grain boundaries of the steel substrate is 1.0&#xd7;10mor less can be obtained even when the grain-oriented electrical steel sheet contains at least one of Sb, Sn, Mo, Cu, and P.

According to one embodiment, it includes a stacked body including N-number of layers (N is an integer of 2 or more) stacked on a semiconductor substrate, opening portions penetrating the stacked body in a stacking direction, columnar bodies respectively disposed in the opening portions, and a slit dividing M-number of layers (M is an integer of 1 or more and (N&#x2212;2) or less) of the stacked body in a horizontal direction from above, wherein the slit is formed with lateral surfaces respectively having a spatial periodicity in a horizontal plane.

Three-dimensional semiconductor memory device including slit with lateral surfaces having periodicity

A single roll type apparatus for manufacturing a metal thin strip by injecting a molten metal onto an outer peripheral face of a cooling roll rotating at a high speed and rapidly solidifying it to manufacture a metal thin strip, wherein an airflow blocking device for blocking the airflow along the surface of the cooling roll is provided at an upstream side of a molten metal injection nozzle for injecting the molten metal in a rotation direction of the cooling roll, and a carbon dioxide gas injection nozzle for forming a flow of carbon dioxide gas on an outer peripheral surface of the cooling roll between the airflow blocking device and the molten metal injection nozzle or forming a carbon dioxide atmosphere on the surface of the cooling roll between the airflow blocking device and the molten metal injection nozzle is disposed, and a foreign material removal device for removing foreign material attached to the surface of the cooling roll is disposed at an upstream side of the airflow blocking device in the rotation direction of the cooling roll, whereby a metal thin strip having a good surface quality can be manufactured stably even in the continuous operation for a long time.

Apparatus for manufacturing metal thin strip

When a steel sheet containing Si: 2-5 mass % after cold rolling is subjected to a primary recrystallization annealing and a finishing annealing for secondary recrystallization to form a grain-oriented electrical steel sheet, the primary recrystallization annealing is performed by rapid heating in the heating process and temperature keeping treatment at a certain temperature in the course of the heating to thereby obtain a grain-oriented electrical steel sheet having plural peaks in a distribution of misorientation angle between crystal orientation of secondary recrystallized grains and Goss orientation, wherein misorientation angle of the second smallest peak among the plural peaks is preferably not less than 5&#xb0; and a grain size of secondary recrystallized grains is not more than 15 mm.

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Kanagawa, Japan

Takeshi Imamura