公开(公告)号：US20240269737A1

公开(公告)日：2024-08-15

申请号：US18567590

申请日：2022-05-31

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Shinichi FUKUNAGA ,  Toshio KAKU ,  Hiroki FURUKAWA

IPC: B22D41/18 ,  F27D3/14

CPC classification number: B22D41/18 ,  F27D3/14

Abstract: A stopper for continuous casting that is intended to prevent adhesion of inclusions to the vicinity of a fitting part of a stopper, and to prevent a nose region of the stopper from cracking or peeling off due to insufficient strength. The stopper for continuous casting includes a gas flow cavity in a vertically-extending central part thereof. In at least part of a vertical section of a nose periphery region of the stopper, a porous refractory material having a gas permeability is arranged on the side of an outer peripheral surface of the nose periphery region. A refractory material having higher strength than that of the porous refractory material is arranged on the side of an inner peripheral surface of the nose periphery region.

公开(公告)号：US20220324017A1

公开(公告)日：2022-10-13

申请号：US17639848

申请日：2020-09-17

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Shinichi FUKUNAGA ,  Takuya OKADA ,  Toshio KAKU ,  Hiroki FURUKAWA

IPC: B22D41/58 ,  B22D41/16 ,  B22D11/11 ,  B22D1/00

Abstract: A tundish upper nozzle structure and a continuous casting method make it possible to cause inclusions to float within a tundish. A flange-shaped member having an outside dimension greater than that of an upper end of a tundish upper nozzle is provided along a part or the entirety of the circumference of the upper end of the tundish upper nozzle, and one or more gas discharge holes are provided in one or more of the following surfaces: a lower surface, an outer peripheral surface and a top surface of the flange-shaped member, and a region of an outer peripheral surface of the tundish upper nozzle below the flange-shaped member. A length in the tundish upper nozzle structure is adjusted to cause almost all gas to float upwardly, or to adjust the flow rate of gas flowing downwardly toward the inner bore of the tundish upper nozzle, and the flow rate of gas floating upwardly.

公开(公告)号：US20220134420A1

公开(公告)日：2022-05-05

申请号：US17424301

申请日：2020-01-15

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Shinichi FUKUNAGA ,  Kazuhisa KATSUKI ,  Junya YANO ,  Hiroki FURUKAWA

IPC: B22D41/50

Abstract: It is intended to provide a flat immersion nozzle capable of stabilizing a molten steel discharge flow to stabilize an in-mold bath surface, i.e., reduce the fluctuation of the in-mold bath surface. Provided is an immersion nozzle having a flat portion whose inner bore has a thickness and a width greater than the thickness, wherein two lateral protrusions each protruding in a thickness direction are provided on each of opposed walls of the flat portion extending in a width direction. The lateral protrusions are arranged at axial symmetrical positions with respect to a longitudinal central axis of the width-directionally extending walls, in pairs, such that each of them extends obliquely downwardly in the width direction, wherein two pairs of the lateral protrusions are arranged, respectively, on the opposed width-directionally extending walls, in opposed relation.

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：US20220062984A1

公开(公告)日：2022-03-03

申请号：US17417461

申请日：2019-12-18

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Shinichi FUKUNAGA ,  Toshio KAKU ,  Hiroki FURUKAWA ,  Takuya OKADA

IPC: B22D41/18 ,  B22D11/18

Abstract: The precision of grasping or controlling backpressure around a gas discharge portion in a stopper for continuous casting can be improved with a stopper for continuous casting which includes a cavity for conveying gas in a vertical direction center of the stopper, one or a plurality of gas discharge holes passing through from the cavity to the outside in a distal center or a side surface of a reduced-diameter region including a fitted portion to a lower nozzle, and a pressure control component in a part of an area above the gas discharge hole within the cavity.

公开(公告)号：US20220111436A1

公开(公告)日：2022-04-14

申请号：US17431214

申请日：2020-03-04

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Shinichi FUKUNAGA ,  Kouichi TACHIKAWA ,  Toshio KAKU

IPC: B22D41/58 ,  B22D41/16

Abstract: Provided is a nozzle or a stopper having a gas blowing function, which is capable of preventing irregular breaking to be triggered by a gas outlet or a gas passage path communicated with the gas outlet, or, even in the event of breaking, preventing expansion of the breaking, and a combination of the nozzle and the stopper. The nozzle comprises: a fitting engagement region refractory material layer composed of a fitting engagement region refractory material; a nozzle body composed of a different refractory material from the fitting engagement region refractory material (main body refractory material); and a gas outlet provided in at least one boundary area between the fitting engagement region refractory material layer and the main body refractory material in a surface of the nozzle contactable with molten steel.

公开(公告)号：US20190337050A1

公开(公告)日：2019-11-07

申请号：US16475174

申请日：2017-12-08

Applicant: KROSAKIHARIMA CORPORATION ,  NIPPON STEEL CORPORATION

Inventor： Shinichi FUKUNAGA ,  Kouji KAWARADA ,  Kohei TANI ,  Masashi OIKAWA

IPC: B22D41/24 ,  B22D11/10 ,  B22D41/42

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.

公开(公告)号：US20190030599A1

公开(公告)日：2019-01-31

申请号：US16070934

申请日：2016-11-09

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Shinichi FUKUNAGA ,  Takahiro KURODA ,  Takashi SADANO ,  Takuya OKADA ,  Arito MIZOBE

IPC: B22D41/50 ,  B22D11/10

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.