JPS6340668A - Vessel for molten metal having molten metal outflow port - Google Patents

Abstract

PURPOSE:To supply a molten metal without slag inclusion while preventing the generation of vortexes and to obtain a high-quality product by disposing plural vanes extending in the vertical direction of a vortex preventing member radially around a molten metal outflow port. CONSTITUTION:The vortex preventing member 50 having 4 sheets of the vanes 52 extending in the perpendicular direction is erected by fitting the lower part 54 thereof into the molten metal outflow port 25 of a tundish 21 lined with refractories 22. The molten steel 42 poured into the tundish flows through the ourflow port 25, a nozzle 35 and a discharge port 37 thereof into a casting mold 38. The molten steel level in the tundish lowers gradually as a result such outflow. The generation of the vortexes in the molten steel flow in the region right above the outflow port 25 is, therefore, prevented by the vanes 25. The high-quality product is formed at a high yield without allowing the slag 44 covering the molten steel surface to be included into the molten steel flow.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a melting container equipped with a melt outlet that allows the melt to flow out without involving slag floating on the meltable shoulder surface.

[Prior Art] As shown in FIG. 4, a conventional kundish has a brick 2 fitted into the bottom 1 at a proper position, and a porous nozzle 3 is fitted into the brick 2. A molten steel outlet 12 is formed.

A sliding nozzle 7 is arranged at a position aligned with this nozzle 3. This sliding nozzle 7 has a fixed platen 8 fixed to the iron skin 4 of the tundish bottom 1, and a sliding platen 9 arranged to slide on the fixed platen 8.

Then, by activating the slide plate 9 and changing the relative relationship (li21) between the hole of the fixed plate 8 and the hole of the slide plate 9, the molten steel flow cross-sectional area is IIL, and the flow rate of the molten steel is adjusted.Slide plate 9 A cylindrical immersion nozzle 10 is attached to the I iff nozzle 1o.
, 19b are immersed in the molten steel in the mold 11 to inject the molten steel into the mold 11 while avoiding contact between the molten steel injection flow and air.

[Problems to be solved by the invention] However, at the end of continuous casting, the molten steel blood loss decreases and l1
When the height of lili becomes less than about 400+n+n, the molten steel in the area directly above the molten steel outlet 12! A vortex 17 is generated in the fourth flow.

Then, since the molten steel 6 in the tundish is covered with the slab 16, the slag 16 is drawn into the vortex 17 and flows into the mold 11 together with the molten steel 6. Therefore, this slag 16 is captured by the solidified shell 13 and becomes an inclusion defect in the slab, resulting in a problem that the quality of the slab deteriorates. In addition, when manufacturing slabs that require high quality, the scene height of the molten steel 6 in the tundish is approximately 40 On+
When the temperature reaches +n, casting is stopped to prevent the generation of vortices 17 and the outflow of slag 16 into the mold 11, but in this case, the molten 16 remains in the tundish, resulting in a low yield. There is a problem.

This invention was made in view of such circumstances, and
Equipped with a molten metal outlet that prevents the generation of vortices and supplies molten metal to other parts without involving slag, suppresses a decrease in yield, and allows high-quality products to be produced. The purpose of this invention is to provide a molten metal container.

[Means for Solving the Problems] A molten metal container equipped with a molten metal outlet according to the present invention is provided with a molten metal outlet at the bottom, and the stored molten metal is supplied to other members through the molten metal outlet. The molten metal container has a molten metal outlet which is equipped with a molten metal outlet, and includes a vortex flow prevention member installed in an area directly above the molten metal outlet, and this vortex flow prevention member has a plurality of vertically extending blades that connect the molten metal flow outlet. The special effects are that they are arranged radially around the center.

[Function 1] A molten metal equipped with a molten metal outlet according to the present invention? In a simple container, when the scene height inside the container decreases, a vortex tends to occur in the area directly above the molten metal outlet, but since multiple blades extending vertically are arranged in this area, this can be prevented. The blades block the swirling flow and prevent the generation of vortices.

[Embodiments] Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings.

FIG. 1 is a side view showing a continuous casting apparatus in which a molten metal container having a molten metal outlet according to an embodiment of the present invention is applied to a tundish. The tundish 21 is lined with a refractory material 22, and the outside is covered with an iron shell 24, and a brick 23 is fitted in a suitable position at the bottom of the tundish 21. In this receiver, a porous nozzle 26 is fitted into a brick 23, and a molten steel outlet 25 is formed. Then, the lower part of the vortex flow prevention member 50 is fitted into the molten steel outlet 25, and the molten steel is melted!
A vortex flow prevention member 50 stands upright above the fourth outlet 25. Further, a sliding nozzle 30 is attached to the lower part of the porous nozzle 26, a fixed plate 31 of the sliding nozzle 30 is fixed to the iron skin 24, and a sliding plate 32 is slidably connected to the lower part of the fixed plate 31. . An immersion nozzle 35 is attached to the lower part of the slide plate 32, and in a steady state, the lower part of the immersion nozzle 35 is attached to the mold 3.
8 is immersed in molten steel. A pair of discharge ports 37a are provided at the bottom of the immersed nozzle 35.

37b was formed and the melt that flowed out from the tandate 21! I42 is adapted to be discharged into the mold 38.

In addition, the In in the mold 38 is filled with powder, and this powder prevents the 18 steel in the mold from oxidizing.
It is designed to improve lubricity between Vtu and solidification 140.

FIG. 2 is a perspective view of the eddy current prevention member 50, and FIG. 3 is a horizontal sectional view of the eddy current prevention member 50. The eddy current blocking member 50 is composed of four plate-shaped blades 52 extending in the vertical direction, a fitting portion 54, and a support rod 56, and is made of, for example, a CaO-based refractory.

The four blades 52 are arranged so that adjacent blades 52 are orthogonal to each other, and the horizontal cross-sectional shape of the four blades combined is a cross. The size of one blade 52 is, for example, about 250 mm in width, about 400 ml in height, and about 2 Q mm in thickness. Further, a fitting part 54 is formed along the lower end of the blade 52, and the fitting part 54 is fitted into the molten steel outlet 25 (diameter is about 80 mm) so that the vortex flow prevention member 50 stands upright. ing. In addition, the support rod 56
extends in a substantially vertical direction, and its downward direction 1M is connected to the upper end of the center of the four blades 52. And support rod 5
The upper end of 6 is fixed to the lid (not shown) of the tundish.

In the meltable container configured in this way, molten steel 42 is injected into the tundish 21 from a not-shown steel tray, and the molten steel 42 is poured into the tundish 21. 142 to the molten steel outlet 2 at the bottom of the tundish 21
5 to sliding nozzle 30, e Fa/7”
The vI type 38
Inject inside. Take 1! Melting from the inside of Tanditshu 21! As the injection of M42 progresses and the remaining molten steel m in the ladle m decreases, the nozzle at the bottom of the ladle is closed and the injection of molten steel from the ladle into the tundish 21 is stopped. Then, since the molten uA 42 in the tundish 21 continues to flow into the mold 38, the wet surface inside the tundish 21 gradually decreases. Then, when the bloodletting height in the tundish 21 decreases to 40 Qmm, a vortex is generated in the molten steel flow in the area directly above the molten steel outlet 25, but the vortex flow prevention member 50 provided in the area directly above the outlet 25 Since the melt 1442 is guided in the vertical direction by the vanes 52, the swirling flow that generates the vortex is blocked.

In other words,? The 17 steel 42 flows in a substantially vertical direction along the blades 52, and the 1Uflll outlet 25 flows without creating a vortex.
The water flows out from the tundish 21 through. For this reason,
m lI in Tanditshu 21? Slag spouting on i-side 4
The molten steel 42 can be injected into the mold 38 without being involved in the molten steel flow.

In addition, although this embodiment shows an example in which the present invention is applied to a kundish, the present invention is not limited to this, and can also be applied to other molten metal containers such as steel plates.

Further, in this embodiment, the blades of the eddy current blocking member are made of four plates, but the number and shape of the blades can be changed without being limited thereto.

[Effects of the Invention] According to the present invention, the vortex flow prevention member having vertically extending blades is installed in the area directly above the molten metal outlet.

Since these blades block the vortex flow, no vortex will be generated even if the height of the four surfaces inside the container is lowered. Therefore, it is possible to extremely reduce the amount of slag that gets caught up in the flow of molten metal flowing out from the molten metal outlet, suppressing a decrease in yield, and producing high-quality products with few inclusions. can.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a continuous casting apparatus according to an embodiment of the present invention in which a melt container with nine outlet ports is applied to a tundish; FIG. 2 is a perspective view showing a vortex flow prevention member; FIG. 3 is a horizontal sectional view of the eddy flow prevention member, and FIG. 4 is a side sectional view showing the continuous VC and casting apparatus at the final stage of casting. 21: Tandaitsu, 25: (8 outflow outlets, 30: Sliding nozzle, 35: Immersion nozzle, 38: Mold,
42; Molten steel, 44; Slag, 50; Eddy flow prevention member, 52
Hane Applicant's Representative Patent Attorney Shikihiko Suzue Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In a molten metal container equipped with a molten metal outlet at the bottom and a molten metal outlet for supplying the stored molten metal to other members through the molten metal outlet, a vortex flow prevention member installed in an area directly above the molten metal outlet is provided. 1. A molten metal container having a molten metal outlet, wherein the vortex flow prevention member has a plurality of vertically extending blades arranged radially around the molten metal outlet.