Jfe Steel Corporation

Tokyo Yogyo Kabushiki Kaisha

Jfe Engineering Corporation

Nippon Rotary Nozzle Co., Ltd.

Jfe Refractories Corporation

Jfe Mechanical Co., Ltd.

Tsuneo Kondo

Jun Kubota

Tsuyoshi Mizuno

Seishi Mizuoka

Hisao Inubushi

Seishl Mizuoka

Ryuzo Nishimachi

Tomohiro Yotabun

Tomohiro Yotabunn

Hideto Takasugi

An apparatus for controlling a flow of a molten steel in a mold, the apparatus including: a casting-condition acquiring unit for acquiring at least five casting conditions; a calculating unit for calculating a molten steel flow velocity on a molten steel bath surface in accordance with the acquired casting conditions; a determining unit for determining whether the acquired molten steel flow velocity is higher or lower than a mold-powder entrainment critical flow velocity; a control unit for applying a shifting magnetic field to impart a braking force to a discharge flow from an immersion nozzle and applying a shifting magnetic field to rotate the molten steel in a horizontal direction; and a shifting magnetic field generating apparatus.

Apparatus for controlling flow of molten steel in mold

A method for controlling a flow of molten steel in a slab continuous casting machine including controlling a molten steel flow velocity on a molten steel bath surface to a predetermined flow velocity by applying a shifting magnetic field; controlling the molten steel flow velocity on the molten steel bath surface from an inclusion-adherence critical flow velocity or more to a mold-powder entrainment critical flow velocity or less by applying a shifting magnetic field; and controlling the molten steel flow velocity on the molten steel bath surface from the inclusion-adherence critical flow velocity or more to the mold-powder entrainment critical flow velocity or less by applying a shifting magnetic field.

Method for controlling flow of molten steel in mold and method for continuously producing a cast product

A poured molten metal quantity control device includes a fixed plate brick having at least one pouring port, a collector nozzle brick, a slide plate brick sandwiched therebetween, an outer race mounted so as to be turned on the outer peripheral side of the fixed plate brick by an extendable unit, and a frame having the slide plate brick mounted thereon that is mounted on the outer race through a pivotal hinge so as to be capable of opening and closing movements. The frame can be opened and closed through the pivotal hinge independently of the turning of the outer race with the extendable unit.

Poured molten metal quantity control device

When a molten steel flow velocity (u) on a bath surface is higher than a mold-powder entrainment critical flow velocity of 0.32 m/sec, the molten steel flow velocity (u) is controlled to a predetermined molten steel flow velocity by applying a shifting magnetic field to impart a braking force to a discharge flow from an immersion nozzle. When the molten steel flow velocity (u) is lower than an inclusion-adherence critical flow velocity of 0.20 m/sec and is higher than or equal to a bath-surface skinning critical flow velocity of 0.10 m/sec, the molten steel flow velocity (u) is controlled to the range of 0.20-0.32 m/sec by applying a shifting magnetic field to rotate the intra-mold molten steel in a horizontal direction. When the molten steel flow velocity (u) is lower than the inclusion-adherence critical flow velocity, the molten steel flow velocity (u) is controlled to the range of 0.20-0.32 m/sec by applying a shifting magnetic field to impart an accelerating force to the discharge flow from the immersion nozzle.

Method and apparatus for controlling flow of molten steel in mold, and method for producing continuous castings

In a rotary nozzle brick body formed into a substantially egg-like shape in it's plan view, the present invention secures a contact area of a nozzle portion and improves a configuration factor which considerably affecting the durability of the body. A rotary nozzle brick body is characterized in that the external shape in plan view is comprised of first circular portions (G), second circular portions (H), third circular portions (K), and tangent lines connecting the first circular portions and third circular portions so that a substantially elliptical shape is formed by increasing the circular portion and shortening the tangent lines, instead of a substantially egg-like shape having long tangent lines. Since the substantially elliptical shape is formed by reducing the linear portion of the brick body in it's plan view while the shape is expanded circularly, the contact area is maintained even if the sliding plate brick is rotated up to it's full-opened state, thereby eliminating a fear that molten steel or the like may leak.

Brick body for rotary nozzle

Growing community of inventors

Tokyo, Japan

Tsuneo Kondo