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：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.