Jfe Steel Corporation

Mitsubishi Heavy Industries Limited

Jfe Mineral & Alloy Company, Ltd.

Ryo Kawabata

Naoki Kikuchi

Shingo Sato

Satoshi Kinoshiro

Kyoko Fujimoto

Toshiyuki Ito

Nobuhiko Oda

Masao Inose

Toshiro Ishige

Yusuke Vincent Fujii

Yukio Takahashi

Hiroki Takeda

Takeshi Ishii

Shota Amano

Yuichi Uchida

Shinji Koseki

Yoshihide Wadayama

Ikuhiro Sumi

Goro Okuyama

Kazuhito Yamamoto

Yusuke Fujii

Shizuhiko Ikeno

Naotaka Sasaki

Yasushi Ogasawara

Manabu Tano

Satoshi Kohira

Yozo Iwaki

Masanori Nishikori

Futoshi Ogasawara

Toshio Shiota

Ippei Higuchi

Yumi Murakami

Atsuo Yuasa

Kochiro Ejima

Hironori Fukushima

Norihiko Suzuki

Kotaro Tanaka

Masaomi Senoo

Yudai Hattori

Rei Yokomori

Atsushi Watanabe

Yoshiteru Kikuchi

Shinichi Akai

A method for producing low-carbon ferromanganese capable of achieving a high Mn yield. In producing low-carbon ferromanganese by blowing an oxidizing gas from a top-blowing lance onto a bath face of high-carbon ferromanganese molten metal accommodated in a reaction vessel provided with a top-blowing lance and bottom-blowing tuyere to perform decarburization, the slag composition during the blowing is adjusted so that a value of (CaO+MgO)/(AlO+SiO) on a mass basis in the slag composition is not less than 0.4 but not more than 5.0. Also, agitation is performed under a condition that an agitation power density ε of an agitation gas blown through the bottom-blowing tuyere is not less than 500 W/t.

Method for producing low-carbon ferromanganese

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

An optical fiber detecting device includes: an optical fiber configured to extend in contact with a surface of an object to be measured; a metal covering configured to cover a part of the optical fiber in an extending direction of the optical fiber from an outside of the object to be measured; a fixing section configured to fix an inner surface of the metal covering and the optical fiber; and welding sections configured to fix the metal covering to the object to be measured at positions interposing the optical fiber in a direction intersecting the extending direction of the optical fiber.

Optical fiber detecting device and method for detecting mechanical strain using optical fiber detecting device

A method for desulfurizing molten steel comprising taking a sample out from molten steel after tapping from a converter or during secondary refining and analyzing the sample rapidly with high accuracy by a method comprising a high frequency induction heating step wherein the sample is combusted and oxidized under the high frequency induction heating in an oxygen atmosphere having an oxygen purity of 99.5 vol % or more to convert S in the sample into SOand an analyzing step wherein SO-containing gas produced in the high frequency induction heating step is analyzed through an ultraviolet fluorescence method to quantify S concentration of the sample.

Molten steel desulfurization method, molten steel secondary refining method, and molten steel manufacturing method

There is proposed a method for preliminary treatment of molten iron wherein heat source for dissolving scrap is ensured sufficiently to improve iron yield while decreasing phosphorus concentration efficiently by suppressing the amount of flux solvent used in the process of desiliconization, dephosphorization and decarburization. In the method for preliminary treatment of molten iron by conducting desiliconization and dephosphorization of molten iron with a converter type container, molten iron is first charged into the converter type container to conduct desiliconization and then intermediate slag removal is conducted, and subsequently a lime-based flux solvent is added to the container while blowing oxygen to conduct dephosphorization of the molten iron, and thereafter newly untreated molten iron is charged into the container to conduct desiliconization, and subsequently the above treatments are repeatedly conducted with the same container.

Method for preliminary treatment of molten iron

Growing community of inventors

Tokyo, Japan

Ryo Kawabata