Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Usinor

Sintokogio, Ltd.

Honda Motor Co., Ltd.

Seikosha Co., Ltd.

Koki Tanaka

Hiroshi Kihira

Kazuhiko Honda

Michio Kaneko

Yoichi Ikematsu

Kazuhiro Takahashi

Kiyonori Tokuno

Akira Takahashi

Yuji Kubo

Hiromasa Shoji

Mitsuharu Yamagata

Masayoshi Suehiro

Takumi Nishimoto

Yoshihiro Suemune

Yoshihisa Takada

Satoshi Arai

Tsutomu Sasaki

Kiyokazu Ishizuka

Kenichi Murakami

Wataru Yamada

Yoshiharu Inoue

Takeshi Yasui

Yoshihiro Serizawa

Nobusato Morishige

Susumu Nakagawa

Kazumi Mizukami

Seiki Takebayashi

Wataru Hisada

Shunichi Hayashi

Yoichi Matsuzaki

Hiromasa Nomura

Hideaki Sawada

Taku Kagawa

Kazuto Kawakami

Masao Kimura

Youichi Ikematsu

Suguru Suzuki

Tamotsu Itoh

Kaoru Yamazaki

Atsuki Matsumura

Tatsuro Honda

Hotaka Honma

Yoshitaka Okitsu

Tetsuo Nishiyama

Takeshi Hamada

Atsushi Ikari

Eiichi Nanba

Kojiro Akiba

Katsuyoshi Kaneko

Takashi Domoto

Isao Hamaguchi

Takeo Itoh

Keisuke Kawamura

Hidetoshi Hatanaka

Yuuichi Yosida

Toshiyuki Katsumi

Takahiro Tanae

Tsuyoshi Miyake

Yoshikazu Umeno

Shota Ishitsuka

Hisayoshi Tachibana

Yohichi Haraguchi

A cooling device cooling an undersurface of a hot rolled steel sheet that is being transported on transport rolls after finish rolling of a hot rolling step includes: width divided cooling zones that are a plurality of cooling zones into which a whole cooling zone is divided in a sheet width direction; divided cooling sections that are a plurality of cooling zones into which each of the width divided cooling zones is divided in the rolling direction; a water nozzle spraying cooling water over each of undersurfaces of the divided cooling sections; a switching mechanism switching the cooling water between impinging and not impinging on the divided cooling sections; a width direction thermometer measuring a temperature distribution in the sheet width direction; and a controller controlling operation of the switching mechanism.

Cooling device for hot rolled steel sheet and cooling method for the same

A titanium or titanium alloy material for a separator of a polymer electrolyte fuel cell having high contact conductivity with carbon and high durability, and including an oxide film formed on a titanium or titanium alloy substrate by a stabilization treatment performed after a passivation treatment, and one or more kinds of conductive materials selected from carbide, nitride, carbonitride, and boride of tantalum, titanium, vanadium, zirconium, and chromium, the conductive materials being dispersed in the oxide film and having a major axis diameter of from 1 nm to 100 nm. A contact resistance value with a carbon paper is 20 m&#x3a9;&#xb7;cmor less at a surface pressure of 10 kgf/cmbefore and after an accelerated deterioration test in which the titanium or titanium alloy material is immersed in a sulfuric acid aqueous solution having an adjusted pH of 4 at 80&#xb0; C. for four days.

Titanium or titanium alloy material for fuel cell separator having high contact conductivity with carbon and high durability, fuel cell separator including the same, and manufacturing method therefor

A titanium or titanium alloy material for a fuel cell separator has a surface shape in which a plurality of projections are distributed, and a titanium oxide film on a surface of the projections. Fine projections are assumed to increase the contact conductivity remarkably. By increasing contact conductivity with carbon and durability of a titanium or titanium alloy material for a fuel cell separator, the lifetime of a fuel cell may be increased. The material has high usability in the cell manufacturing industry.

Titanium material or titanium alloy material for fuel cell separator having high contact conductivity with carbon and high durability, fuel cell separator including the same, and fuel cell

A galvannealed steel sheet includes: a steel sheet; a coating layer on a surface of the steel sheet; and a mixed layer formed between the steel sheet and the coating layer, in which the mixed layer includes a base iron portion having fine grains having a size of greater than 0 &#x3bc;m and equal to or smaller than 2 &#x3bc;m, a Zn&#x2014;Fe alloy phase, and oxides containing one or more types of Mn, Si, Al, and Cr, and in the mixed layer, the oxides and the Zn&#x2014;Fe alloy phase are present in grain boundaries that form the fine grains and the Zn&#x2014;Fe alloy phase is tangled with the base iron portion.[Mn]+[Si]+[Al]+[Cr]&#x2267;0.4&#x2003;&#x2003;(Expression 1)

Galvannealed steel sheet and method of manufacturing the same

The present invention provides titanium material for a separator for solid polymer fuel cell use comprised of titanium which has a surface layer part where conductive compound particles are affixed, which is excellent in contact resistance between the separator surface and carbon paper and in durability, and which is low in cost and superior in recyclability and a method of production of the same. This titanium material for separator use has on the surface of the titanium base material a film comprised of the titanium compound particles made of titanium carbide, titanium nitride, or titanium carbonitride and titanium oxide. The film has a thickness of 0.1 to 1 &#x3bc;m, the coverage rate is an area percentage of 20% or more, and the contents of carbon and nitrogen in the film total 5 to 40 at %. The titanium material for a separator is produced by annealing or shot blasting and pickling.

Titanium material for solid polymer fuel cell separator use and method of production of same

A titanium material for a solid polymer fuel cell separator having a low contact resistance and a method of production of the same, the titanium material having at its surface a surface layer structure in which particles of a Ti compound containing either C or N are dispersed, the particles of Ti compound being covered by titanium oxide and/or metal Ti, characterized in that, when analyzed from the surface by XPS, a Ti2p spectrum of TiOis detected, further, at a Ti2p spectral energy range of TiO and/or a Ti2p spectral energy range of metal Ti, a Ti maximum detection peak height is at least 3 times the standard deviations of the background at the respective spectral energy ranges, and at a C1s spectral energy range and N1s spectral energy range, a maximum detection peak height is less than 3 times the standard deviations of the background at the respective spectral energy ranges of C1s and N1s, are provided.

Titanium material for solid polymer fuel cell separator having low contact resistance and method of production of same

Hot dip galvanized steel sheet excellent in shapeability and plateability comprised of high strength steel sheet according to the present invention can be provided containing, by mass % about, C: 0.05 to 0.25%, Si: 0.3 to 2.5%, Mn: 1.5 to 2.8%, P: 0.03% or less, S: 0.02% or less, Al: 0.005 to 0.5%, N: 0.0060% or less and the balance of Fe and unavoidable impurities. The exemplary steel sheet can have thereon a galvanized layer containing, e.g., about Al: 0.05 to 10 mass % and Fe: 0.05 to 3 mass % and the balance of Zn and unavoidable impurities. Such exemplary hot dip galvanized steel sheet can have oxides containing Si in an average content of about 0.6 to 10 mass % at the crystal grain boundaries and in the crystal grains at the sheet steel side 5 &#x3bc;m or less from the interface between the high strength steel sheet and the plating layer and by the presence of Fe&#x2014;Zn alloy with an average grain size of about 0.5 to 3 &#x3bc;m at the plating side.

High strength hot dip galvanized steel sheet and high strength galvannealed steel sheet excellent in shapeability and plateability

A process of production for producing a high strength galvannealed steel sheet by a hot-dip galvanized steel sheet production equipment using an all radiant tube type annealing furnace and a production equipment for the same are provided, comprising continuously hot-dip galvanizing a high strength steel sheet having a content of Si of 0.4 to 2.0 wt % during which making the atmosphere of the reducing zone an atmosphere containing Hto 1 to 60 wt % and comprised of the balance of N, HO, O, CO, CO, and unavoidable impurities, controlling the log (PCO/PH) of the carbon dioxide partial pressure and hydrogen partial pressure in the atmosphere to log (PCO/PH)&#x2266;&#x2212;0.5 and the log (PHO/PH) of the water partial pressure and hydrogen partial pressure to log (PHO/PH)&#x2266;&#x2212;0.5, and controlling the log (P/PH) of the total partial pressure Pof the carbon dioxide partial pressure PCOand water partial pressure PHO and the hydrogen partial pressure to &#x2212;3&#x2266;log (P/PH)&#x2266;&#x2212;0.5.

Process of production and production system of high strength galvannealed steel sheet

The present invention provides a method of production of a separator for a solid polymer type fuel cell characterized by shaping a substrate comprised of stainless steel, titanium, or a titanium alloy and then spraying the substrate surface with superhard core particles comprised of conductive compound particles of an average particle size of 0.01 to 20 &#x3bc;m mixed with a coating material and coated on their surfaces under conditions of a spray pressure of 0.4 MPa or less and a spray amount per cmof the substrate of 10 to 100 g in blast treatment. The ratio of the conductive compound to the mass of the core particles is 0.5 to 15 mass %.

Solid polymer type fuel cell separator and method of production of same

The present invention releases a method of producing a metal separator for a solid polymer fuel cell by stainless steel, titanium, or titanium alloy during which securing lower cost and mass producibility by using a material having a high workability to form a complicated shape by a high productivity, then using an inexpensive blast process to drive a conductive substance into the surface of the metal separator member, that is, provides a stainless steel, titanium, or titanium alloy solid polymer fuel cell separator comprised of stainless steel, titanium, or titanium alloy in the surface of which a low ion release conductive substance is buried, having an arithmetic mean roughness (Ra) of the separator surface of 0.5 to 5.0 &#x3bc;m, having a 10-point mean roughness (Rz) of 3 to 20 &#x3bc;m, having an average spacing of surface relief shapes (Sm) of 300 &#x3bc;m or less, having values of a warp rate and twist rate of a separator of 0.1 or less, and having a contact resistance value with respect to carbon paper of 15 m&#x3a9;cmor less at a surface pressure of 1 MPa.

Stainless steel, titanium, or titanium alloy solid polymer fuel cell separator and its method of production and method of evaluation of warp and twist of separator

The present invention provides a separator for a solid polymer type fuel cell superior in low contact resistance of the fuel cell separator surface with carbon paper and flatness and a method of production of the same, that is, a separator for a solid polymer type fuel cell comprising a substrate of stainless steel or titanium or a titanium alloy having a surface layer part on which conductive compound particles are fixed, wherein said conductive compound particles are comprised of one or more types of metal borides, metal carbides, and metal nitrides with an average particle size of 0.01 to 20 &#x3bc;m, said conductive compound particles are present in a region from said substrate surface to a depth of 10 &#x3bc;m, and a distribution of concentration of the metal element forming the conductive compound in said region satisfies relations between a concentration C of the metal element forming the conductive compound and a depth x from the substrate surface shown by equation &#x3c;1&#x3e; (C=A&#xb7;exp(&#x2212;x/t)+B) and equation &#x3c;2&#x3e; (10&#x2266;A&#x2266;90, &#x2212;4.0&#x2266;B&#x2266;1.0, 0.5&#x2266;t&#x2266;4.0).

Grain-oriented electrical steel sheet excellent in coating adhesion is provided. The steel sheet contains Si: 2 to 7% mass % and has a primary coating composed mainly of forsterite on its surface. A compound (A) containing one or more elements selected from among Ca, Sr and Ba, at least one rare earth metal, and sulfur is incorporated in the primary coating so as to reside in the interface layer between the primary coating and the steel sheet. As a result, occurrence of primary coating exfoliation at regions that are strongly worked during manufacture of a wound core transformer or the like is prevented.

Grain-oriented electrical steel sheet excellent in coating adhesion and method of producing the same

The present invention provides an alloyed molten zinc plated steel sheet having an area of the Fe and Zn alloy phase in the unformed parts in the plating layer of less than 10% of the area of the steel sheet as a whole and superior in strength and shapeability and a method of producing this alloyed molten zinc plating steel sheet by a continuous zinc plating production system which enables production at a low cost without modification of the system or addition of steps, said alloyed molten zinc plated steel sheet characterized by comprising a steel sheet including C: 0.05 to 0.40%, Si: 0.2 to 3.0%, and Mn: 0.1 to 2.5%, the balance comprised of Fe and unavoidable impurities, having on its surface a Zn alloy plating layer comprised of Fe in a concentration of 7 to 15 wt %, Al in a concentration of 0.01 to 1 wt %, and the balance of Zn and unavoidable impurities, said plating layer containing oxide particles of at least one type of oxide selected from an Al oxide, Si oxide, Mn oxide, and complex oxides of the same alone or in combination.

Alloyed molten zinc plated steel sheet and process of production of same

A molten zinc plated steel sheet superior in plating bondability and provided with both strength and shapeability is provided and a method of producing this molten zinc plating steel sheet by a continuous zinc plating production system which enables production at a low cost without modification of the system or addition of steps is provided, said molten zinc plated steel sheet characterized by comprising, by wt %, a steel sheet including C: 0.05 to 0.40%, Si: 0.2 to 3.0%, and Mn: 0.1 to 2.5%, the balance comprised of Fe and unavoidable impurities, having on its surface a Zn plating layer containing Al: 0.01 to 1% and the balance of Zn and unavoidable impurities and containing inside the steel sheet within 2 &#x3bc;m from the interface of said plating layer and steel sheet oxide particles of at least one type of oxide selected from an Al oxide, Si oxide, Mn oxide, or complex oxide comprised of at least two of Al, Si, and Mn.

High strength molten zinc plated steel sheet and process of production of same

Growing community of inventors

Futtsu, Japan

Koki Tanaka