JPH0615852U - Slide valve device capable of remelting solidified metal in molten steel flow hole - Google Patents

Abstract

(57) [Summary] [Structure] The technical structure of the present invention is such that at least one molten steel flow hole is provided in the upper plate or slide plate of the SV device.
It is characterized in that a single oxygen gas discharge port is provided, and as an aspect thereof, it may be provided together with the conventional inert gas jetting unit.
In the plate brick of the V apparatus, the oxygen discharge port may be provided only on the inner peripheral surface of the upper plate, and the oxygen discharge port may be provided upward at the center of the molten steel flow hole of the slide plate. The outlet may be arranged at a specific position on the slide plate. [Effect] By adopting the technical configuration of the present invention, even if the base metal is skinned due to solidification at the bottom of the molten steel flow hole of the upper plate, the solidified base metal can be safely melted again by blowing oxygen gas. The molten steel can be quickly and reliably discharged from the SV device.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an SV device capable of removing solidified metal in a molten steel flow hole of a slide valve (hereinafter referred to as SV) device.

[0002]

[Prior art]

 In the continuous casting equipment, the molten metal received in the ladle is poured into the mold via the tundish. At this time, at the beginning of pouring, before pouring molten metal into the mold, a certain amount of molten metal is stored in the tundish, and after floating impurities, slide the slide plate to open the nozzle and perform pouring. Has started. This is called a closed start, and this technology has been widely used recently.

Various methods are used as a method of blowing an inert gas so as not to solidify inside the nozzle hole while the molten metal is stored in the tundish by closing the nozzle hole of the SV by the closed start of the continuous casting tundish. Is proposed. For example, a molten metal discharge device having a plurality of gas supply holes communicating with the molten steel flow holes of a fixed plate brick of an SV device or a porous refractory in this portion, or an outer peripheral portion inside the opening of the fixed plate brick. A method is known in which a gas injection ring having a plurality of small radial holes is arranged from the groove formed along the opening toward the center of the opening toward the sliding plate.

[0004]

[Problems to be solved by the device]

In the conventional method as described above, when the molten steel temperature is lower than the target temperature, the molten steel may not naturally flow out even if the SV device is opened. That is, there is a case where the molten steel in the molten steel flow hole of the plate just above the slide plate of the SV device solidifies (usually called "skinning phenomenon") and does not open naturally. In such a case, the conventional method is to insert a lance pipe for oxygen injection from above the tundish through the molten steel into the molten steel flow hole of the upper nozzle to forcibly open the hole (see FIG. 7). However, this kind of work is dangerous and it is difficult to securely insert the lance pipe into the flow hole. As shown by the dotted line in Fig. 7, the lance pipe is often displaced from the center. In this case, the upper nozzle hole And O ₂ will be sprayed on the nozzle receiving bricks in the vicinity and in the vicinity, and the upper nozzle and the nozzle receiving bricks will be abnormally damaged, and a steel leak accident may occur in some cases.

The present inventors have developed the present invention as a result of various studies and experiments in order to solve the above-mentioned drawbacks of the conventional method. The technical constitution of the present invention is that the upper plate or the slide of the SV device is constructed. At least one oxygen gas discharge port is provided in the molten steel flow hole of the plate. As an aspect thereof, it may be provided together with a conventional inert gas jetting part. The oxygen discharge port may be provided only on the inner peripheral surface of the slide plate, or the oxygen discharge port may be provided upward at the center of the molten steel flow hole of the slide plate, and the oxygen discharge port may be provided at a specific position of the slide plate. You may arrange. By adopting the technical configuration of this proposal, even if the bottom of the molten steel flow hole of the upper plate is clogged with metal due to solidification, the solidified metal is remelted by blowing oxygen gas, safely and quickly. Molten steel can be reliably discharged from the SV device.

A detailed description will be given with reference to the accompanying drawings showing a specific example of the present invention.

An example in which the mechanism of the present invention is applied to a slide plate of an SV device is shown in FIGS. FIG. 1 is a schematic vertical sectional view showing a state where molten steel is stored in a tundish. As shown in FIG. 3 which is a plan view of the slide plate 2, an inert gas jetting portion 10 is provided on the upper surface of the slide plate 2 and an upward O ₂ gas discharge pipe is provided substantially at the center of the molten steel flow hole 2'of the plate. 11 is provided. Depending on the case, as shown in the drawing, an inert gas ejection portion 10 ′ may be provided also on the inner peripheral surface of the molten steel flow hole of the upper plate 1.

In the mechanism described above, the molten gas is continuously stirred by jetting the inert gas into the molten steel from the inert gas jetting portion 10 or / and 10 ′ when the molten steel is stored. However, in some cases, solidified metal 30 is generated at the bottom of the flow hole, and the molten steel does not spontaneously flow out even when the SV device is opened.

Therefore, in the present invention, the SV device is opened and the O ₂ gas is discharged from the O ₂ gas discharge pipe 11 provided in the flow hole of the slide plate to forcibly melt the high temperature solidified metal. , Molten steel can be discharged.

FIG. 4 and FIG. 5 show an example in which the O ₂ gas discharge port is arranged upward in the sliding direction of the slide plate 2 and at a position other than the inert gas ejection portion 10 with respect to the molten steel flow hole 2 ′. FIG. In this example, the molten steel is agitated by jetting an inert gas into the molten steel storage, and the solidified metal in the upper plate is melted by moving the slide plate 2 to the O ₂ gas discharge port 11 and jetting O ₂ gas. To implement. When the metal is melted, the slide plate 2 is moved and the molten steel flow holes 2'are aligned to perform normal casting.

FIG. 6 is a schematic cross-sectional view showing an example in which an inert gas ejection portion 10 ′ and an O ₂ gas discharge port 11 are vertically arranged on the upper plate 1, 31 is an inert gas supply pipe, and 32 is an O ₂ gas. It is a supply pipe, and the O ₂ gas supply pipe 32 may be configured to communicate with an inert supply source in some cases.

In the case of this example, when the steel is stored, an inert gas is jetted from the O ₂ gas supply pipe 32 to stir the molten steel, and when a solidified layer is generated at the bottom, the switching valve 33 is operated to operate the O ₂ gas. Gas may be discharged to melt the solidified layer, and molten steel may flow out.

Although an example of the three-layer SV device has been described above, it is obvious to those skilled in the art that the present invention can be applied to the two-layer SV device with some modifications.

[0014]

[Effect of device]

By adopting the technical configuration of the present invention, even if a solidified layer is generated at the bottom of molten steel stored at the time of closed start and natural outflow is not possible, dangerous work such as melting by using a lance pipe is not performed as in the conventional case. ₂ Gas blowing allows molten steel to flow out quickly and easily.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a steel storage state to which the mechanism of the present invention is applied.

FIG. 2 is a vertical cross-sectional view when O ₂ gas is blown in the example of FIG.

FIG. 3 is a plan view of a slide plate used in the above example.

FIG. 4 is a longitudinal sectional view showing another application example of the mechanism of the present invention when O ₂ gas is injected.

5 is a plan view of a slide plate used in the example of FIG.

FIG. 6 is a vertical sectional view showing an example in which an inert gas jetting portion and an O ₂ discharge port are provided on the upper plate.

FIG. 7 is a schematic vertical cross-sectional view showing an example of a forced opening of a tundish according to a conventional method.

[Explanation of symbols]

1 Upper Plate 2 Slide Plate 2 ′ Molten Steel Flow Hole 3 Lower Plate 10 Inert Gas Jet 11 O ₂ Gas Discharge Pipe 30 Solidified Metal 31 Inert Gas Supply Pipe 32 O ₂ Gas Supply Pipe

Claims (5)

[Scope of utility model registration request] 1. A slide capable of remelting a solidified metal in a molten steel flow hole, characterized in that at least one oxygen gas discharge port is provided in the molten steel flow hole of an upper plate or a slide plate of a slide valve device. Valve device 2. The molten steel flow hole according to claim 1, wherein in a slide valve device having an inert gas jetting portion on the inner peripheral surface of the molten steel flow hole of the upper plate, an oxygen gas discharge port is provided below the jetting portion. A slide valve device that can re-melt the solidified base metal. 3. A slide valve device capable of remelting the solidified metal in the molten steel flow hole, wherein only the oxygen gas discharge port is provided on the inner peripheral surface of the molten steel flow hole of the upper plate. 4. The oxygen gas discharge port is opened in the molten steel flow hole of the slide plate and toward the upper surface of the slide plate, and an oxygen gas supply passage communicating with the discharge port is provided in the slide plate. A slide valve device capable of remelting the solidified metal in the molten steel circulation hole 5. A slide plate having an inert gas jetting portion on the upper surface, wherein an oxygen gas discharge port is opened upward in the sliding direction of the slide plate and on the upper plate sliding surface other than the molten steel flow hole. Slide valve device capable of remelting solidified metal in molten steel flow hole