Patents Assigned to Krosakiharima Corporation
  • Publication number: 20200188991
    Abstract: A flat immersion nozzle stabilizes the discharging flow of molten steel thereby stabilizing the molten steel surface in a mold, namely, decreasing the fluctuation thereof. In the immersion nozzle having a flat shape in which a width Wn of an inner hole is greater than a thickness Tn of the inner hole, a central protrusion portion (1) is disposed in a center section of a wall surface in a width direction of a flat section. Wp/Wn, a ratio of a length Wp of the central protrusion portion in the width direction to Wn, is 0.2 or more and 0.7 or less. The central protrusion portion (1) is disposed symmetrically as a pair; and a total length Tp in the thickness direction of the pair of the central protrusion portions is 0.15 or more and 0.75 or less of Tn.
    Type: Application
    Filed: September 13, 2016
    Publication date: June 18, 2020
    Applicant: KROSAKIHARIMA CORPORATION
    Inventors: Shinichi FUKUNAGA, Arito MIZOBE, Kenichi OKI, Hiroki FURUKAWA
  • Publication number: 20200108440
    Abstract: Disclosed is a casting nozzle intended to suppress or prevent breaking of a nozzle body thereof. The casting nozzle comprises: a nozzle body; a metal casing disposed to surround an upper end of the nozzle body to form a gas pool between an outer peripheral surface of the upper end of the nozzle body and an inner peripheral surface of the metal casing; and a bridging segment provided in at least a part of the gas pool to bridge between the outer peripheral surface of the upper end of the nozzle body and the inner peripheral surface of the metal casing.
    Type: Application
    Filed: June 19, 2018
    Publication date: April 9, 2020
    Applicant: KROSAKIHARIMA CORPORATION
    Inventors: Takafumi HARADA, Kouichi TACHIKAWA
  • Patent number: 10562094
    Abstract: An annular weir is fixed at a bottom of a tundish and just under a long nozzle of a ladle in a continuous casting apparatus. The annular weir includes a cavity which has a substantially circular shaped transverse section. The cavity includes: an upper side opening configured to receive a stream of molten metal from an upper side through the long nozzle; an inner protrusion which is annular in shape and which extends toward an inner side from an upper end of an inner wall of the cavity; a first space on an inner side of the inner protrusion; and a second space which communicates with the first space 13a and which is on a lower side of the first space.
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: February 18, 2020
    Assignees: NIPPON STEEL NISSHIN CO., LTD., KROSAKIHARIMA CORPORATION
    Inventor: Yutaka Hiraga
  • Publication number: 20200038944
    Abstract: A plate, a plate-holding apparatus, and a holding method for the plate for facilitating work to attach the plate to a plate-receiving metal frame of a sliding nozzle device. A gap is ensured between a to-be-held portion of the plate and an inner wall surface of an engagement groove such that, when the plate is held by engaging the to-be-held portion of the plate with the engagement groove of a holding portion of the plate-holding apparatus, the plate is movable in the longitudinal direction, the width direction, and the thickness direction of the plate.
    Type: Application
    Filed: October 16, 2017
    Publication date: February 6, 2020
    Applicant: KROSAKIHARIMA CORPORATION
    Inventor: Toshihiro IMAHASE
  • Publication number: 20190382313
    Abstract: Disclosed is a refractory product for casting of steel, which is capable of forming a dense surface layer which is high in terms of a slag infiltration suppressing ability and strong, in a surface region thereof efficiently or sufficiently or in an optimum state. The refractory product contains 1 mass % or more of free carbon, and 2 mass % to 15 mass % of an aluminum component as metal, with the remainder comprising a refractory material as a main composition, wherein the refractory product has a permeability of 1×10?16m2 to 15×10?16m2.
    Type: Application
    Filed: January 19, 2018
    Publication date: December 19, 2019
    Applicant: KROSAKIHARIMA CORPORATION
    Inventors: Tarou MAKINO, Shuuji NOAI, Keiichirou AKAMINE
  • Patent number: 10471504
    Abstract: A simplified and downsized coupling position switching mechanism capable of transmitting reliably and smoothly the driving force of the drive unit to the slide metal frame to switchably change a coupling position between the slide metal frame and the drive unit in the sliding nozzle apparatus. A coupling portion in the slide metal frame protrudes on the side of the drive unit and allows a rod head of the drive unit to be coupled thereto, and the coupling portion has a coupling space allows the rod head to be disposed movably in a sliding direction of the slide metal frame. A separator is inserted into the coupling space to divide the coupling space into first and second coupling chambers in the sliding direction of the slide metal frame. The coupling portion has a fitting section for allowing the separator to be fitted thereinto when it is inserted into the coupling space.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: November 12, 2019
    Assignee: KROSAKIHARIMA CORPORATION
    Inventors: Toshihiro Imahase, Junichi Funato
  • Publication number: 20190337050
    Abstract: In a sliding nozzle comprising three plates consisting of an upper plate, an intermediate plate capable of a sliding movement, and a lower plate, it is intended to suppress adhesion and deposition of metal oxides and others on wall surfaces of inner bores of the three plates. The intermediate plate has: a first inclined portion whose surface defines a slidingly closing directional leading-side wall surface of an inner bore thereof and extends obliquely downwardly in a diametrically contracting direction; a second inclined portion whose surface defines an upper part of a slidingly closing directional trailing-side wall surface of the inner bore thereof and extends obliquely downwardly in a diametrically contracting direction, and a third inclined portion whose surface defines a lower part of the slidingly closing directional trailing-side wall surface of the inner bore thereof and extends obliquely downwardly in a diametrically expanding direction.
    Type: Application
    Filed: December 8, 2017
    Publication date: November 7, 2019
    Applicants: KROSAKIHARIMA CORPORATION, NIPPON STEEL CORPORATION
    Inventors: Shinichi FUKUNAGA, Kouji KAWARADA, Kohei TANI, Masashi OIKAWA
  • Patent number: 10464128
    Abstract: A coupling position switching mechanism capable of improving efficiency of a coupling position switching operation, while realizing structural simplification, and reductions in size and cost. A first coupling portion consisting of one of a slide metal frame-side coupling portion and a drive unit-side coupling portion is formed with a groove-shaped recess and a through-hole in this order from the side of a distal end of the first coupling portion, and a second coupling portion consisting of the remaining one of the slide metal frame-side coupling portion and the drive unit-side coupling portion is formed with the through-hole.
    Type: Grant
    Filed: November 17, 2015
    Date of Patent: November 5, 2019
    Assignee: KROSAKIHARIMA CORPORATION
    Inventors: Toshihiro Imahase, Junichi Funato
  • Publication number: 20190248706
    Abstract: Provided are a magnesia carbon brick which does not include graphite yet has excellent spalling and corrosion resistances, and a method for producing thereof. The brick is obtained by adding an organic binder to a refractory raw material mixture followed by kneading, molding, and heat-treating, wherein the mixture includes total 0.1 to 2.0 mass % of pitch and/or carbon black, total 0.1 to 1.0 mass % of aluminum and/or aluminum alloy, 3.0 to 10.0 mass % of magnesia having particle diameter of less than 0.075 mm, and 87.0 to 96.0 mass % of magnesia having particle diameter of 0.075 to 5 mm; and a mass ratio of magnesia having particle diameter of 1 to 5 mm to that of 0.075 to 1 mm is 1.66 to 2.34; graphite is not included therein; and an apparent porosity thereof after heat-treatment under reductive atmosphere at 1400° C. for 3 hours is 8.0% or less.
    Type: Application
    Filed: October 16, 2017
    Publication date: August 15, 2019
    Applicants: KROSAKIHARIMA CORPORATION, NIPPON STEEL CORPORATION
    Inventors: Yuya TOMITA, Masato TANAKA, Shigeto SAWAI
  • Publication number: 20190070661
    Abstract: In the method for replacing an immersion nozzle while pushing out a used immersion nozzle by a new immersion nozzle, in order to minimize leakage of molten steel during the replacement, to enable the use of a shaped joint sealer in a joint interface, and to ensure high sealability, a concave portion is formed on the new immersion nozzle's upper plane so as to include a nozzle hole, and the shaped joint sealer is mounted in this concave portion. The immersion nozzle's upper plane is caused to slide while being pressed to the upper nozzle's lower plane.
    Type: Application
    Filed: February 7, 2017
    Publication date: March 7, 2019
    Applicant: KROSAKIHARIMA CORPORATION
    Inventors: Shinichi FUKUNAGA, Takahiro KURODA, Tatsuya OOUCHI, Takuya OKADA, Akira OOTSUKA
  • Patent number: 10220438
    Abstract: An immersion nozzle for use with an immersion nozzle replacement apparatus, capable of preventing crack formation due to the presence of a neck region. The immersion nozzle includes a nozzle body, a flange, and a metal casing. The nozzle body is formed such that a region of an outer peripheral surface thereof located above a point of power of an upward supporting force from a supporting device extends vertically up to an upper edge of the nozzle body without any dimensional change with respect to an central axis of an inner bore of the nozzle body. The outer peripheral surface region is not joined to the metal casing.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: March 5, 2019
    Assignee: KROSAKIHARIMA CORPORATION
    Inventors: Takuya Okada, Takahiro Kuroda
  • Publication number: 20190055165
    Abstract: A precast refractory block for a coke oven having high hot strength and stable under-load expansion/shrinkage behavior at high temperatures. Specifically, a silica-based precast refractory block contains a P2O5 component in an amount of 0.3 to 2.0 mass %.
    Type: Application
    Filed: February 27, 2017
    Publication date: February 21, 2019
    Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION, KROSAKIHARIMA CORPORATION
    Inventors: Hidetoshi TERASHIMA, Yasushi TSUTSUI, Hironao TAKEMOTO, Taijirou MATSUI, Takashi MATSUNAGA, Yutaka KITAZAWA
  • Publication number: 20190030599
    Abstract: A nozzle structure for discharging molten steel with improved sealing performance. The nozzle structure comprises: a molten steel discharge path having an inner bore; and one or more joints through which the molten steel discharge path is divided at one or more positions in a orthogonal direction with respect to an upward-downward direction of discharge of molten steel, and which join the molten steel discharge path. An inner bore sleeve is formed of a refractory material, and provided on an inner bore surface of the nozzle structure to extend in the upward-downward direction across at least one of the joints.
    Type: Application
    Filed: November 9, 2016
    Publication date: January 31, 2019
    Applicant: KROSAKIHARIMA CORPORATION
    Inventors: Shinichi FUKUNAGA, Takahiro KURODA, Takashi SADANO, Takuya OKADA, Arito MIZOBE
  • Publication number: 20180333773
    Abstract: A coupling position switching mechanism capable of improving efficiency of a coupling position switching operation, while realizing structural simplification, and reductions in size and cost. A first coupling portion consisting of one of a slide metal frame-side coupling portion and a drive unit-side coupling portion is formed with a groove-shaped recess and a through-hole in this order from the side of a distal end of the first coupling portion, and a second coupling portion consisting of the remaining one of the slide metal frame-side coupling portion and the drive unit-side coupling portion is formed with the through-hole.
    Type: Application
    Filed: November 17, 2015
    Publication date: November 22, 2018
    Applicant: KROSAKIHARIMA CORPORATION
    Inventors: Toshihiro IMAHASE, Junichi FUNATO
  • Patent number: 10125051
    Abstract: A cordierite-based sintered body comprises cordierite as a primary crystal phase and LaMgAl11O19 as a secondary crystal phase, wherein a ratio ILMA (114)/IMAS (004) is in the range of 0.01 to 0.8, where the ILMA (114) denotes a peak intensity of a (114) plane of LaMgAl11O19 as measured by powder X-ray diffractometry, and the IMAS (004) denotes a peak intensity of a (004) plane of cordierite as measured by powder X-ray diffractometry. The disclosure is intended to enhance mechanical property and improve complex and fine processability for a cordierite-based sintered body without compromising low thermal expansibility, high dimensional long-term stability, high stiffness (high elastic modulus) and precision polishing characteristic.
    Type: Grant
    Filed: April 1, 2016
    Date of Patent: November 13, 2018
    Assignee: KROSAKIHARIMA CORPORATION
    Inventor: Jun Sugawara
  • Patent number: 10093576
    Abstract: In order to address the technical problem of allowing an unshaped refractory material using a spinel-containing alumina cement to provide further improved corrosion resistance and slag infiltration resistance while reducing the occurrence of crack/peeling, an unshaped refractory material is provided which comprises a refractory raw material mixture having a particle size of 8 mm or less, with the refractory raw material mixture having an alumina cement at least a part of which is a spinel-containing alumina cement, and, with respect to 100 mass % of the refractory raw material mixture, the alumina cement contains CaO in an amount of 0.5 to 2.5 mass %, and the spinel-containing alumina cement contains spinel in an amount of 3.5 to 10.5 mass %.
    Type: Grant
    Filed: March 3, 2014
    Date of Patent: October 9, 2018
    Assignee: KROSAKIHARIMA CORPORATION
    Inventors: Koji Goda, Yoshihiro Sasatani, Koichi Uemura
  • Publication number: 20180118625
    Abstract: The present invention is intended to enhance mechanical property and improve complex and fine processability for a cordierite-based sintered body without compromising low thermal expansibility, high dimensional long-term stability, high stiffness (high elastic modulus) and precision polishing characteristic. The cordierite-based sintered body of the present invention comprises cordierite as a primary crystal phase and LaMgAl11O19 as a secondary crystal phase, wherein a ratio ILMA (114)/IMAS (004) is in the range of 0.01 to 0.8, where the ILMA (114) denotes a peak intensity of a (114) plane of LaMgAl11O19 as measured by powder X-ray diffractometry, and the IMAS (004) denotes a peak intensity of a (004) plane of cordierite as measured by powder X-ray diffractometry.
    Type: Application
    Filed: April 1, 2016
    Publication date: May 3, 2018
    Applicant: KROSAKIHARIMA CORPORATION
    Inventor: Jun SUGAWARA
  • Publication number: 20180001379
    Abstract: A simplified and downsized coupling position switching mechanism capable of transmitting reliably and smoothly the driving force of the drive unit to the slide metal frame to switchably change a coupling position between the slide metal frame and the drive unit in the sliding nozzle apparatus. A coupling portion in the slide metal frame protrudes on the side of the drive unit and allows a rod head of the drive unit to be coupled thereto, and the coupling portion has a coupling space allows the rod head to be disposed movably in a sliding direction of the slide metal frame. A separator is inserted into the coupling space to divide the coupling space into first and second coupling chambers in the sliding direction of the slide metal frame. The coupling portion has a fitting section for allowing the separator to be fitted thereinto when it is inserted into the coupling space.
    Type: Application
    Filed: December 10, 2015
    Publication date: January 4, 2018
    Applicant: KROSAKIHARIMA CORPORATION
    Inventors: Toshihiro IMAHASE, Junichi FUNATO
  • Patent number: 9821371
    Abstract: A refractory material contains: 40 mass % or more of MgO; 4 to 30 mass % of a free carbon component; and one or more of B2O3, P2O5, SiO2 and TiO2, in a total amount of 0.3 to 3 mass %, with the remainder being at least one other type of additional refractory component. A void layer exists in an interface between a carbon-containing matrix microstructure residing at least on opposite sides of a maximum-size one of a plurality of MgO-containing particles in the refractory material, and the maximum-size MgO-containing particle. A sum of respective thicknesses of the void layer at two positions on the opposite sides is 0.2 to 3.0% of a ratio with respect to particle size of the maximum-size MgO-containing particle. An inorganic compound of MgO and the one or more of B2O3, P2O5, SiO2 and TiO2 exists entirety or partially in a surface of each of the MgO-containing particles.
    Type: Grant
    Filed: March 19, 2014
    Date of Patent: November 21, 2017
    Assignee: KROSAKIHARIMA CORPORATION
    Inventors: Katsumi Morikawa, Akinari Sasaki, Taro Makino, Ling Li
  • Patent number: D809028
    Type: Grant
    Filed: August 12, 2015
    Date of Patent: January 30, 2018
    Assignee: KROSAKIHARIMA CORPORATION
    Inventor: Toshihiro Imahase