Nippon Steel Corporation

Nippon Steel & Sumitomo Metal Corporation

Nippon Steel Hardfacing Corporation

Tocalo Co., Ltd.

Nippon Steel & Sumikin Hardfacing Co., Ltd.

Yasushi Kurisu

Kazuto Yamamura

Hiroshi Fukuchi

Hiroyuki Mitake

Norimasa Yamasaki

Yoshiaki Shia

Yuuichi Ishimori

Tetsuo Shima

Yu Li

Futoshi Nishimura

Hiroyuki Tanaka

Junya Takahashi

Masafumi Miyazaki

Eiichiro Ishimaru

Eiichi Takeuchi

Hideaki Yamamura

Naoya Hamada

Hideki Oka

Tatsuo Suidzu

Masaaki Omodaka

Masafumi Matsumoto

Mamoru Yamada

Yoshihiro Yamada

Tadahiro Izu

Isao Suichi

Kazumi Seki

Mitsuru Nakayama

Katsuya Kojima

Koji Yagyu

Yasuo Maruki

Satoshi Uchida

Keiji Tsunenari

Atsushi Migita

Hayato Konnai

Katsumi Ando

Chihiro Yamaji

Yuuki Mishima

A hearth roll for a continuous annealing furnace, the hearth roll comprising a thermal spray coating on a surface of the hearth roll, wherein the thermal spray coating comprises main components consisting of a Co-based alloy, a carbide of a transition metal, and a double oxide; and impurities, the double oxide consists of one or two types of a first double oxide consisting of Al and a rare earth element and a second double oxide consisting of a transition metal and a rare earth element, and when the main components are 100 mass %, a content of the Co-based alloy is 25 mass % or more and 50 mass % or less, a content of the carbide is 5 mass % or more and 30 mass % or less, and a content of the double oxide is 20 mass % or more and 45 mass % or less.

Hearth roll for continuous annealing furnace

A hot dip metal plating bath roll preventing flaws in a steel sheet due to a bath roll, realizing stable running at a high speed, and improving the productivity of a plated steel sheet, which hot dip metal plating bath roll having vertical grooves each formed on an outer circumferential surface of the roll and including two first curved parts projecting to the outside of the roll and at least one second curved part arranged between the two first curved part and projecting to the inside of the roll and horizontal grooves each formed on an outer circumferential surface of the roll along a barrel length direction of the roll, a pitch P(mm) and depth d(mm) of the vertical grooves satisfying 1.0&#x2264;P&#x2264;10, 0.2&#x2264;d&#x2264;5, and d&#x2264;P/2, a depth d(mm) being 60% to 150% of the depth dof the vertical grooves, and a width w(mm) of the horizontal grooves being 2 times or more of the depth dor 2 times or more of a radius of curvature (mm) of curved surfaces forming bottom parts of the horizontal grooves and 0.7 times or less of a pitch P(mm), the pitch P(mm) of the horizontal grooves being 1.0&#x2264;P&#x2264;10.

Hot dip metal plating bath roll and method of production of hot dip metal plating bath roll

A steel sheet shape control method includes, (A) setting a target correction shape of the steel sheet at a position of an electromagnet to a curved shape, (B) measuring a steel sheet shape when electromagnetic correction is performed, (C) calculating the steel sheet shape in a nozzle position based on the steel sheet shape, (D) repeating (B) and (C) by resetting the target correction shape to a curved shape having a smaller amount of warp, (E) when the amount of warp of the steel sheet shape at the position of the nozzle is less than the upper limit value, (F) calculating vibration of the steel sheet at the position of the nozzle, and (G) adjusting a control gain of the electromagnet until amplitude of vibration is less than a second upper limit value when the amplitude of the vibration is equal to or more than the second upper limit value.

Steel sheet shape control method and steel sheet shape control apparatus

A hearth roll for heat treatment furnaces has excellent build-up resistance, has a hexavalent-chromium-free thermal spray coating film formed on the roll surface thereof and is safe for the environment. A method for manufacturing a hearth roll for continuous annealing furnaces includes a first step of applying an aqueous solution containing chromium phosphate onto a thermal spray coating film formed on the roll surface of a hearth roll or impregnating the thermal spray coating film with the aqueous solution; and a second step of burning the hearth roll.

Hearth roll for continuous annealing furnaces, and method for manufacturing same

A hearth roll includes a base roll, a thermally sprayed coating formed on the base roll, and a modified coating formed on the thermally sprayed coating. The modified coating is formed by modifying a part or the whole of a surface of the thermally sprayed coating by melting and solidification of the thermally sprayed coating, by irradiating a part or the whole of the surface of the thermally sprayed coating with an energy beam. The thickness of the modified coating is from 2 to 20 &#x3bc;m, and the Vickers hardness HV of the modified coating is from 1.2 to 1.4 times larger than the Vickers hardness HV of the thermally sprayed coating.

Hearth roll and manufacturing method therefor

The hearth roll for a continuous annealing furnace is able to suppress the occurrence of buildup on the hearth roll surface and able to be stably used for a long period under the high temperature environment. The hearth roll has a cermet coating comprised 50 to 90 vol % of ceramic and the balance of a heat resistant alloy on its surface, the ceramic containing CrC: over 50 to 90 vol %, AlO: 1 to 40 vol %, YO: 0 to 3 vol %, and ZrB: 0 to 40 vol % and having a balance of unavoidable impurities and pores, the heat resistant alloy containing Cr: 5 to 20 mass %, Al: 5 to 20 mass %, and one or both of Y and Si: 0.1 to 6 mass % and has a balance of one or both of Co and Ni and unavoidable impurities.

Hearth roll in a continuous annealing furnace and its production method

A metal plate material hot molding apparatus is provided for press molding a heated metal plate material. The apparatus may include supply piping for a cooling medium in a mold, and ejection holes penetrating from a molding surface of the mold to the supply piping. The exemplary apparatus may also include discharge piping for the cooling medium situated in the mold, and discharge holes penetrating from the molding surface of the mold to the discharge piping, and cooling piping. Molding procedure can be performed while the cooling medium is ejected from the ejection holes to a gap between the metal plate material and the mold.

Metal plate material hot press molding apparatus and hot press molding method

The present invention provides conveying rolls and hearth rolls in a continuous annealing furnace for producing steel sheet having flame sprayed coatings on their surfaces wherein the flame sprayed coatings are comprised of cermet having a ceramic ingredient content of 80 vol % or less or a heat resistant alloy, the flame sprayed coatings have oxide layers comprised of one or more of a flame sprayed metal, Cr, Si, Zr, or Al, and a ratio R/R1 of the roughness parameter R of the surface of the oxide layer measured based on JIS B0633 setting the cutoff value at an initial value and a roughness parameter R' measured setting the cutoff value at 1/10 of the initial value is 4 or more.

Conveying roll, and hearth roll in a continuous annealing furnace

Apparatus for hot press-forming metal plate material

A cooling drum for metal cast strip by continuous casting has dimples 40 to 200 &#x3bc;m in average depth and 0.5 to 3 mm in diameter of circle equivalent formed on a plated peripheral surface of the cooling drum, adjacent to each other at rims of the dimples; and a film, containing oxides of at least one member selected from the group consisting of Ni&#x2014;W, Ni&#x2014;Co&#x2014;W, Cr, Ni&#x2014;Fe and Ni&#x2014;Al, is formed on the peripheral surface.

Cooling drum for thin slab continuous casting, processing method and apparatus thereof, and thin slab and continuous casting method thereof

Dimples, preferably 40 to 200 &#x3bc;m in average depth and 0.5 to 3 mm in diameter of circle equivalent, are formed on the peripheral surface of a cooling drum, adjacent to each other at the rims of the dimples; and fine humps (preferably, fine humps 1 to 50 &#x3bc;m in height and 5 to 200 &#x3bc;m in diameter of circle equivalent on the surfaces of the dimples and/or fine humps 1 to 50 &#x3bc;m in height and 30 to 200 &#x3bc;m in diameter of circle equivalent at the rims of the dimples), fine holes (preferably, fine holes 5 &#x3bc;m or more in depth and 10 to 200 &#x3bc;m in diameter of circle equivalent), or fine unevenness (preferably, fine unevenness 1 to 50 &#x3bc;m in average depth and 10 to 200 &#x3bc;m in diameter of circle equivalent) are formed at the rims and/or on the indented surfaces of said dimples.

Cooling drum for continuously casting thin cast piece and fabricating method and device therefor and thin cast piece and continuous casting method therefor

Growing community of inventors

Tokyo, Japan

Yasushi Kurisu