公开(公告)号：US12023730B2

公开(公告)日：2024-07-02

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

CPC classification number: B22D41/18 ,  B22D11/18 ,  B22D41/186

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：US11745257B2

公开(公告)日：2023-09-05

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

CPC classification number: 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：US11235384B2

公开(公告)日：2022-02-01

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：US10799950B2

公开(公告)日：2020-10-13

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.

公开(公告)号：US10682696B2

公开(公告)日：2020-06-16

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: B22D41/08 ,  B22D41/56 ,  B22D11/10 ,  B22D41/50

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：US10799942B2

公开(公告)日：2020-10-13

申请号：US15774319

申请日：2016-09-13

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Shinichi Fukunaga ,  Arito Mizobe ,  Kenichi Oki ,  Hiroki Furukawa

IPC: B22D41/08 ,  B22D11/06 ,  B22D11/103 ,  B22D41/50

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.