JPH0663729A - Method for opening tapping hole of molten steel vessel - Google Patents

Abstract

PURPOSE:To rapidly and surely open a tapping hole provided at the bottom part of a molten steel vessel in flowing out the molten steel within the molten steel vessel. CONSTITUTION:In a molten steel vessel 1 which is provided with sliding nozzles 7, 8 at a tapping hole 5 provided at the bottom part and receives the molten steel 13 after the tapping hole 5 is filled with the filling sand 11, a moving body 12 of a rod shape is provided, which moves when the tapping hole is opened by the sliding of the sliding nozzles 7, 8 and breaks the consolidated sand which is consolidated by receiving the molten steel 13 at the stage before receiving the molten steel 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten steel container such as a ladle which is used to temporarily receive molten steel produced by an electric furnace or the like and inject it into an ingot casting mold or a continuous casting mold. The present invention relates to a method for opening a molten steel container tap hole that is suitable for quickly and surely opening the tap hole provided in the.

[0002]

2. Description of the Related Art A molten steel container such as a ladle is provided with lining bricks at the bottom and side walls, and a tap hole is provided at a part of the bottom.

In the past, this tap hole was often opened and closed by a stopper system using rods, but thereafter, the main structure is that which is opened and closed by a sliding nozzle system. ing.

In this sliding nozzle system, particularly when it is applied to continuous casting, it is possible to create a nearly perfect steady state by setting the sliding nozzle opening degree corresponding to the drawing speed of the slab by continuous casting. It is more advantageous than the stopper type using a rod.

When receiving molten steel in a molten steel container equipped with such a sliding nozzle, the molten steel is supplied after filling the bottom of the tap with sand filled with filling sand. When the molten steel is to be discharged from the molten steel container, the movable side sliding nozzle among the sliding nozzles is moved and opened to allow the molten steel to flow out following the downward flow of the stuffed sand due to the weight of the molten steel. .

When the stuffed sand is sintered by the temperature of the molten steel or the molten steel enters between the stuffed sand and hardens as a metal, the stuffed sand becomes a solidified sand. It does not fall downward due to the weight, and therefore molten steel cannot flow out.In such a case, blow oxygen into the solidified sand from the bottom of the tap to remove the sintered and bare metal parts. There is also a so-called enema work in which the stuffed sand is dropped downward and the molten steel is subsequently flown out by burning at a high temperature.

[0007]

As described above, in the conventional case, by sliding the movable side sliding nozzle among the sliding nozzles to open the sliding nozzle, the weight of molten steel causes the stuffed sand to flow downward. After that, the molten steel was allowed to flow out.However, as mentioned above, sometimes the packed sand becomes a solidified sand solidified by the molten steel temperature or molten steel infiltration, and the solidified sand falls even when the sliding nozzle is opened. There is a problem that it may not be possible to carry out molten steel outflow, the opening ratio of the tap hole when tapping molten steel may be lowered, and it may be necessary to perform enema work. there were.

Therefore, it is possible to reduce the state in which the molten sand cannot be discharged due to the solidified sand as much as possible, so that the filling sand can be dropped by the opening of the sliding nozzle and the subsequent molten steel can be swiftly and reliably discharged. Was a challenge.

[0009]

According to the present invention, there is provided a method for opening a tap hole in a molten steel container, which is provided with a sliding nozzle at the tap hole provided at the bottom, and the tap hole is filled with sand and then filled with sand. , In the filling sand that closes the tap hole before receiving the molten steel,
It is characterized in that it is configured to provide a moving body that moves with the opening due to the sliding of the sliding nozzle to destroy the solidified sand solidified by receiving the molten steel, and in the embodiment, the moving body has a rod shape, In the tap hole of the molten steel container in a horizontal state, with a part of the filling sand put under the moving body, it is configured to be held in an inclined state,
Similarly, in the embodiment, the moving body is rod-shaped and has a collar in the middle, and is held in an inclined state by a collar provided in the middle of the moving body in the tap hole of the molten steel container in a horizontal state. It is characterized by having done.

[0010]

In the method for opening the tap hole of the molten steel container according to the present invention, before the molten steel is received, the molten steel is moved into the filling sand closing the tap hole together with the opening by sliding of the sliding nozzle. Since a moving body such as a rod-shaped body that destroys the solidified sand that has been solidified by receiving the molten steel is provided, the packed sand that blocks the tap hole provided at the bottom of the molten steel container sinters or melts at the molten steel temperature. Even if it solidifies due to intervening as a bare metal due to the intrusion of the solidified sand, and the solidified sand is in the state, the moving body such as a rod moves along with the opening due to the sliding of the sliding nozzle to destroy the solidified sand. As a result, the stuffed sand can be smoothly and reliably dropped, and the subsequent molten steel outflow can be smoothly and reliably performed, and the inability of the molten steel to flow out can be reduced. Te, so that the opening ratio of the outflow position at the time of molten steel tapping is significantly improved.

[0011]

1 and 2 show an embodiment of a method for opening a tap for a molten steel container according to the present invention.
Shows the part of the tap hole in the state where the molten steel container is in the horizontal direction, and FIG. 2 shows the part of the tap hole after supplying the molten steel in the state where the molten steel container is in the vertical direction.

In this embodiment, the molten steel container 1 has a capacity of 7
It is a 0 ton ladle, and this molten steel container 1 has a bottom lined brick 3 and a side wall lined brick 4 attached to the inside of a steel shell 2 to form a container shape and a tap hole 5 at the bottom. It is provided.

The tap hole 5 is provided with an upper nozzle 6 and the lower side of the upper nozzle 6 (see FIG. 1).
Has a fixed side plate-like sliding nozzle 7 and a movable side plate-like sliding nozzle 8 on the left side, and a lower nozzle 9 is further provided on the lower side (however, on the left side in FIG. 1).

Then, the movable side plate-like sliding nozzle 8 is slid in the opening direction of the tap hole with respect to the fixed side plate-like sliding nozzle 7 to bring the state as shown in FIG. The hot water outlet 5 is closed by sliding the sliding nozzle 8 in the opposite direction to the hot water outlet closing direction as shown in FIG.

In the molten steel container 1 having such a structure, first, as shown in FIG. 1, the molten steel container 1 is set in a horizontal state, and the movable side plate-like sliding nozzle 8 is moved in the opening direction of the tap hole. State, tap 5
From the lower side (however, the left side in FIG. 1), that is, from the lower nozzle 9 side, a part of the filling sand 11a in the tap hole 5
And a rod-shaped moving body (in this embodiment, a rod-shaped body made of a steel material having a Mn content of 15% by weight and having a hemispherical shape at one end) 1 on a part of the filling sand 11a.
2 is placed and the rod-shaped moving body 12 is held in an inclined state.

Next, as shown in FIG. 2, after the molten steel container 1 is set in the normal vertical orientation, the filling sand 11 is put into the tap hole 5 and the tap hole 5 is closed by the filling sand 11. Then, molten steel (in this embodiment, molten steel of S45C) 13 is supplied.

Due to the heat of the molten steel 13, a sinter portion is formed in the stuffed sand 11 and a portion of the solidified sand which is solidified as a metal by the infiltration of the molten steel 13 is generated. A part of the moving body 12 is interposed in the sand part.

Next, the movable side plate-like sliding nozzle 8
2 in the direction of the arrow A in FIG. 2, that is, in the opening direction of the tap hole, the moving body 12 moves in the direction of the arrow B, whereby the solidified sand portion of the stuffing sand 11 is destroyed, and the movable plate-like sliding nozzle 8 When the tap hole 5 is opened by sliding, the filling sand 11 drops due to the weight of the molten steel 13, and subsequently the molten steel 13 flows down from the tap port 5.

As a result, according to the conventional blockage of the tap hole 5 with only the stuffing sand 11, the solidified sand portion is formed on the stuffing sand 11 to cause a situation in which it cannot fall, so that the tap hole 5 is opened. The rate is about 65%, and about 35% requires enema work by blowing oxygen, whereas in the embodiment of the present invention, the moving body 12 is provided in the part of the filling sand 11. As a result, the portion of the solidified sand is broken, and the solidified sand is easily dropped, so that the conventional state of being unable to drop is significantly reduced, and the opening ratio of the tap hole 5 is improved to about 90%.

FIG. 3 shows another embodiment of the present invention in which a collar 12b is provided in the middle of a moving body 12 having a rod shape and one end of which is a hemispherical portion 12a. .

With such a structure of the moving body 12, when the molten steel container 1 shown in FIG. 1 is in a horizontal direction, the moving body 12 is held in an inclined state without providing a part of the filling sand 11a. It is possible to obtain the same effect as that of the previous embodiment.

[0022]

According to the present invention, in a molten steel container which is equipped with a sliding nozzle at the tap hole provided at the bottom and is filled with sand after filling the tap hole and receiving molten steel, at the stage before receiving the molten steel, Since the moving body that moves with the opening by sliding of the sliding nozzle to destroy the solidified sand solidified by receiving the molten steel is provided in the filling sand that closes the tap hole, it is provided at the bottom of the molten steel container. Even when the packed sand blocking the tap hole is sintered due to the temperature of the molten steel or is solidified by intervening as molten metal due to the infiltration of molten steel to form a solidified sand, the sliding nozzle slides. Since the moving body such as a rod-like body moves along with the opening due to the movement to destroy the solidified sand, the stuffed sand due to the molten steel weight can be smoothly and reliably dropped. Subsequent molten steel outflow will also be carried out smoothly and reliably, and the inability of molten steel outflow will be reduced, and the opening ratio of the tap hole during molten steel tapping will be greatly improved. It is possible to significantly reduce inferior enema work, which is a remarkable advantage.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of a tap portion showing a state in which a molten steel container (ladle) is horizontally oriented and a rod-shaped moving body is held in an inclined state in an embodiment of the present invention.

FIG. 2 is a cross-sectional explanatory view of the tap hole portion showing a state after the tap hole of the molten steel container is filled with sand and the molten steel is supplied in the embodiment of the present invention.

FIG. 3 is a side view illustrating a rod-shaped moving body used in another embodiment of the present invention.

[Explanation of symbols]

 1 Molten Steel Container 5 Outlet Port 6 Upper Nozzle 7 Fixed Side Plate Sliding Nozzle 8 Movable Side Plate Sliding Nozzle 9 Lower Nozzle 11 Filled Sand 11a Part of Filled Sand 12 Moving Body 12b Tsuba 13 Molten Steel

Claims (3)

[Claims] 1. In a molten steel container which is equipped with a sliding nozzle at a tap hole provided at the bottom and which receives molten steel after filling the tap port with sand and filling the tap hole with the molten steel at a stage before receiving the molten steel. A method for opening a molten steel container tap opening, wherein a moving body that moves with the opening by sliding of the sliding nozzle and destroys the solidified sand solidified by receiving the molten steel is provided inside. 2. The moving body is rod-shaped, and is held in a tilted state in a molten steel container in a horizontal state by a part of the filling sand put under the moving body in the tap hole. Opening method of molten steel container tap. 3. The moving body is rod-shaped and has a collar in the middle thereof, and is held in an inclined state by a collar provided in the middle of the moving body in the tap hole of the molten steel container in a sideways state. 1. A method for opening a molten steel container tap hole according to 1.