Jfe Steel Corporation

Shinji Koseki

Yoshihiko Oda

Tadashi Nakanishi

Hiroaki Toda

Tomoyuki Okubo

Yusuke Vincent Fujii

Yukio Takahashi

Takashi Doi

Naoki Kikuchi

Hiroyuki Fukuda

Toshito Takamiya

Shingo Sato

Toshio Ishii

Takashi Wada

Tatsuhiko Hiratani

Shota Amano

Nobuhiko Oda

Naoki Nakata

Ryo Kawabata

Goro Okuyama

Teruhiko Tobe

Katsuhiro Takebayashi

Hiroyasu Shigemori

Noriko Ozawa

Seiko Nara

Eitaro Shidara

Yumi Murakami

Atsuo Yuasa

Shiguma Uno

Masaru Fukumura

A slit nozzle having a double-tube structure and a method for manufacturing a high-silicon steel strip having a small variation in Si concentration depending on the position in the width direction of the steel strip. The slit nozzle has a double-tube structure, in which a flow-control plate which closes a gap between an inner tube and an outer tube is disposed between an open end of the inner tube and an end of a delivery port, and in which an opening is formed in a plane in which the flow-control plate is disposed only in a range of the flow-control plate of 27.5° or more and 332.5° or less in terms of a central angle with respect to a reference line Lpassing through the axis of the outer tube and the central position in the width direction of the delivery port.

Slit nozzle and method for manufacturing high-silicon steel strip

An analysis systemincludes: an operational data acquisition unitthat acquires operational data including an operational state of a production line; a product information acquisition unitthat acquires a state of a product manufactured in the production line and outputs the state of the product as product information; a production state analyzerthat obtains a predetermined physical quantity of the product on a basis of the operational data acquired by the operational data acquisition unitand outputs the predetermined physical quantity as information on the physical quantity; and a correlation analyzerthat performs analysis of a correlation between the information on the physical quantity and the product information.

Analysis system and analysis method

A top-blowing lance nozzle is configured to freely switch an adequate expansion condition so as to control an oxygen-blowing amount and a jetting velocity independently of each other without requiring a plurality of lance nozzles or a mechanically movable part. A lance nozzle is configured to blow refining oxygen to molten iron charged in a reaction vessel while a gas is blown from a top-blowing lance to the molten iron. One or more blowing holes for blowing a working gas are on an inner wall side surface of the nozzle, at a site where the lance nozzle has a minimum cross-sectional area in a nozzle axis direction or at a neighboring site of the site.

Lance nozzle

A non-oriented electrical steel sheet having a chemical composition comprising C: not more than 0.010 mass %, Si: 1.0-7.0 mass %, Mn: 0.001-3.0 mass %, sol. Al: 0.0001-3.5 mass %, P: 0.01-0.2 mass %, S: not more than 0.010 mass %, N: not more than 0.010 mass % and the remainder being Fe and inevitable impurities, wherein a ratio (P/Fe) of a peak-peak height Pof P near to an electronic energy of 120 eV to a peak-peak height Feof Fe near to an electronic energy of 700 eV in an Auger differential spectrum obtained by analyzing a broken surface of a grain boundary through Auger electron spectroscopy is not less than 0.1 and a sheet thickness is 0.10-0.50 mm, and a motor using such a non-oriented electrical steel sheet as an iron core.

Non-oriented electrical steel sheet having high magnetic flux density and motor

A non-oriented electrical steel sheet is obtained by subjecting a slab containing C: not more than 0.005 mass %, Si: 1.0-5.0 mass %, Mn: 0.04-3.0 mass %, sol. Al: not more than 0.005 mass %, P: 0.03-0.2 mass %, S: not more than 0.005 mass %, N: not more than 0.005 mass %, B: not more than 0.001 mass %, and Se: not more than 0.001 mass % and satisfying sol. Al+C+5B+5Se&#x2264;0.005 mass % to hot rolling, cold rolling and finish annealing. A sheet temperature at the outlet side of the rolling machine in at least one pass of the final cold rolling is set to a range of 100-300&#xb0; C. to provide S/2M of not less than 1.0 and S/5C of not less than 1.0 when X-ray intensity ratios of {001}&#x3c;250&#x3e;, {111}&#x3c;112&#x3e; and {001}&#x3c;100&#x3e; in a central layer in a thickness direction are S, M and C, respectively.

Non-oriented electrical steel sheet and method for producing the same, and motor core and method of producing the same

A non-oriented electrical steel sheet having a high magnetic flux density and a low anisotropy contains C: not more than 0.01 mass %, Si: 1-4 mass %, Mn: 0.05-3 mass %, P: 0.03-0.2 mass %, S: not more than 0.01 mass %, Al: not more than 0.004 mass %, N: not more than 0.005 mass %, As: not more than 0.003 mass %, and preferably further contains one or two of Sb: 0.001-0.1 mass % and Sn: 0.001-0.1 mass % or further contains one or two of Ca: 0.001-0.005 mass % and Mg: 0.001-0.005 mass %.

Non-oriented electrical steel sheet having excellent magnetic properties

A non-oriented electrical steel sheet having a high magnetic flux density and a low iron loss at not only a commercial frequency but also a high frequency zone, which has a chemical composition including C: not more than 0.0050 mass %, Si: more than 1.5 mass % but not more than 5.0 mass %, Mn: not more than 0.10 mass %, sol. Al: not more than 0.0050 mass, P: more than 0.040 mass % but not more than 0.2 mass %, S: not more than 0.0050 mass %, N: not more than 0.0040 mass % and Ca: 0.001-0.01 mass % and the remainder being Fe and inevitable impurities and a compositional ratio of CaO in oxide-based inclusions existing in a steel sheet of not less than 0.4 and/or a compositional ratio of AlOof not less than 0.3, and a hot rolled steel sheet used as a raw steel material thereof.

Non-oriented electrical steel sheet and hot rolled steel sheet thereof

A batch annealing furnace includes a coil support base on which an end face of a coil is mounted and that supports the coil with an axis of the coil being upright, an inner cover that covers an entire body of the coil mounted on the coil support base, and a cooling pipe that extends downward from the upper part of the inner cover to a cavity of the inner peripheral part of the coil mounted on the coil support base and cools the coil from the inner surface side by passing a coolant through the inside of the cooling pipe.

Batch annealing furnace for coils

Growing community of inventors

Kawasaki, Japan

Shinji Koseki