公开(公告)号：US20220388910A1

公开(公告)日：2022-12-08

申请号：US17770387

申请日：2020-10-23

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Ling LI ,  Katsumi MORIKAWA ,  Akinari SASAKI ,  Shigefumi MATSUMOTO

IPC: C04B35/484 ,  C04B35/057 ,  C04B35/653 ,  C04B41/50 ,  C04B41/87 ,  B22D11/10

Abstract: Provided is a ZrO2—CaO—C based refractory material which is capable of maintaining high adhesion resistance over a long period of time, while exhibiting significant slaking resistance, and suppressing self-fluxing, i.e., exhibiting corrosion-erosion resistance. The refractory material comprises a CaO—ZrO2 composition containing a CaO component in an amount of 40% by mass to 60% by mass, wherein a mass ratio of the CaO component to a ZrO2 component is 0.67 to 1.5, and wherein the CaO—ZrO2 composition includes a eutectic microstructure of CaO crystals and CaZrO3 crystals, wherein a width of each of the CaO crystals observable in a cross-sectional microstructure is 50 μm or less.

公开(公告)号：US20220033302A1

公开(公告)日：2022-02-03

申请号：US17281369

申请日：2019-09-25

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Yousuke OONO

IPC: C04B14/28 ,  C04B28/26 ,  C04B28/34 ,  F27D1/16

Abstract: A spray material for hot and dry spray application with improved corrosion resistance, and a hot and dry spray application method with improved corrosion resistance. A hot and dry spray application method comprises pressure-feeding a mixture comprising a refractory material and a binder, toward a spraying nozzle via a pipe, and adding water to the mixture at a distal end of the spraying nozzle to apply a spray under a hot condition. The mixture contains magnesium limestone having a particle size of 0.075 mm to less than 1 mm, in an amount of 10 mass % to 50 mass %, in 100 mass % of a total amount of the refractory material and the binder. The content of magnesium limestone having a particle size of less than 0.075 mm in 100 mass % of the total amount of the refractory material and the binder is 35 mass % or less (including 0).

公开(公告)号：US11213886B2

公开(公告)日：2022-01-04

申请号：US16647960

申请日：2018-09-12

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Yuuya Uchida ,  Hirotaka Itou ,  Yuuji Igawa ,  Hitoshi Nakamura

IPC: B22D41/58 ,  B22D1/00 ,  B22D11/117

Abstract: A socket installation structure of a refractory article is designed to prevent gas leakage therein. A first flange is provided between an outward end and an inward end of a socket, and a face of the first flange on the side of an inward end thereof is bonded to an article body of the refractory article through a sealing material. Further, a face of the first flange on the side of an outward end thereof faces a metal plate disposed around the outward end or a second flange provided on the side of the outward end, through a low thermally-conductive material layer made of a low thermally-conductive material having a thermal conductivity at room temperature of 40 (W/(m·K)) or less.

公开(公告)号：US20210339312A1

公开(公告)日：2021-11-04

申请号：US17282059

申请日：2019-09-25

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Tatsuya OOUCHI ,  Masaki YAMAMOTO

IPC: B22D41/54 ,  B22D41/50 ,  C04B35/103

Abstract: It is intended to suppress flaming and smoking due to combustion of combustible substances in a certain-shaped joint material, while maintaining hot sealability of the certain-shaped joint material. A certain-shaped joint material for hot installation is obtained by: adding organic additives to a blend in a combined amount of 26 mass % to 50 mass %, with respect to and in addition to 100 mass % of the blend, wherein the blend comprises 50 mass % to 90 mass % of gibbsite type aluminum hydroxide raw material, 1 mass % to 9 mass % of clay, and 9 mass % to 23 mass % of graphite, with the remainder mainly composed of an additional refractory raw material; and subjecting the resulting mixture to kneading, forming and drying.

公开(公告)号：US11135646B2

公开(公告)日：2021-10-05

申请号：US16342701

申请日：2017-10-16

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Toshihiro Imahase

IPC: B22D11/10 ,  B22D11/18 ,  B22D41/34 ,  B22D41/38 ,  B22D41/40 ,  B22D41/56

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.

公开(公告)号：US11117187B2

公开(公告)日：2021-09-14

申请号：US16624470

申请日：2018-06-19

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Takafumi Harada ,  Kouichi Tachikawa

IPC: B22D41/58 ,  B22D11/10

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.

公开(公告)号：US10800707B2

公开(公告)日：2020-10-13

申请号：US16345386

申请日：2017-10-16

Applicant: KROSAKIHARIMA CORPORATION ,  NIPPON STEEL CORPORATION

Inventor： Yuya Tomita ,  Masato Tanaka ,  Shigeto Sawai

IPC: C04B35/043 ,  C04B35/01 ,  F27D1/00

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.

公开(公告)号：US20200246863A1

公开(公告)日：2020-08-06

申请号：US16647960

申请日：2018-09-12

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Yuuya UCHIDA ,  Hirotaka ITOU ,  Yuuji IGAWA ,  Hitoshi NAKAMURA

IPC: B22D41/58 ,  B22D11/117

Abstract: A socket installation structure of a refractory article is designed to prevent gas leakage therein. A first flange is provided between an outward end and an inward end of a socket, and a face of the first flange on the side of an inward end thereof is bonded to an article body of the refractory article through a sealing material. Further, a face of the first flange on the side of an outward end thereof faces a metal plate disposed around the outward end or a second flange provided on the side of the outward end, through a low thermally-conductive material layer made of a low thermally-conductive material having a thermal conductivity at room temperature of 40 (W/(m·K)) or less.

公开(公告)号：US20190070661A1

公开(公告)日：2019-03-07

申请号：US16077587

申请日：2017-02-07

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Shinichi FUKUNAGA ,  Takahiro KURODA ,  Tatsuya OOUCHI ,  Takuya OKADA ,  Akira OOTSUKA

IPC: B22D41/56 ,  B22D41/50 ,  B22D11/10

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.

公开(公告)号：US20180333773A1

公开(公告)日：2018-11-22

申请号：US15527473

申请日：2015-11-17

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Toshihiro IMAHASE ,  Junichi FUNATO

IPC: B22D41/38

CPC classification number: B22D41/38 ,  B22D41/34

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. The first and second coupling portions are configured such that, during a casting operation, they are coupled together by a coupling pin inserted into the through-hole of the first coupling potion and the through-hole of the second coupling portion, and during surface pressure-applying/releasing operation, they are coupled together by a second coupling pin inserted into the groove-shaped recess of the first coupling portion and the through-hole of the second coupling portion.