JPH0459157A - Tundish for continuous casting - Google Patents

Abstract

PURPOSE:To obtain a continuously cast slab having two kinds of materials by arranging two molten metal discharging chambers in two intermediate chambers communicated with a molten metal dropping chamber for receiving the molten metal in a ladle through each passage and making one of the intermediate chamber a material adjusting chamber in a tundish for continuous casting. CONSTITUTION:The tundish is positioned at above a casting mold and the molten metal is supplied into the molten metal dropping chamber 13 in the tundish from the ladle. Then, the molten metal is allowed to flow into each intermediate chamber 14, 15 and the molten metal flowing into the intermediate chamber 14, is allowed to flow in the molten metal discharging chamber 16 through the passage 25 and discharged into the casting mold from a molten metal discharging hole 29. The molten metal flowing in the other intermediate chamber 15 is allowed to flow in the molten metal discharging chamber 17 through the passage 31 and discharged into the casting mold from a molten metal discharging hole 34. Then, as the material adjustment is executed in the intermediate chamber to be the material adjusting chamber, the molten metals in the intermediate chamber to be the material adjusting chamber and the other intermediate chamber are different from each other.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a container-shaped continuous casting tundish used in a continuous casting method.

[Prior Art] In recent years, continuous casting methods have been widely used due to their advantages such as high productivity. This continuous casting method is a method in which a cast piece is directly produced from molten metal, omitting the ingot making process and the blooming process.

In this continuous casting method, molten metal such as steel stored in a steel tray is received in a container-shaped tundish and is continuously discharged into a casting mold from a spout formed in the wall of the tundish. Then, the molten metal is continuously solidified in a casting mold to form a semi-solidified piece and eventually a solidified piece, and the solidified piece is further cooled in a cooling zone, thereby obtaining a long continuous cast piece.

A conventionally used tundish has a palm that receives the molten metal from the ladle, and a tap that is formed at the bottom of the chamber and faces the casting mold either directly or through an immersion nozzle.

[Problem to be solved by the invention] By the way, in the continuous casting method using the above-mentioned tundish, the molten metal in the tundish is homogenized within the seedling, and it is not possible to form two continuously cast pieces of different materials at the same time.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to provide a continuous casting tundish that can simultaneously form continuous casting pieces of at least two different materials.

[Means for Solving the Problems] The continuous casting tundish of the present invention comprises a pouring chamber for receiving molten metal in a ladle, at least two mutually independent intermediate chambers communicating with the pouring chamber, and one intermediate chamber. a first tapping chamber having a first tap for discharging the molten metal into the casting mold; communicating with the remaining intermediate chamber via a second communicating path for casting molten metal; It is characterized by comprising a second tapping chamber having a second tapping port for discharging the melt into the mold and independent from the first pouring chamber, and at least one of the intermediate chambers being a material adjustment chamber for adjusting the material of the molten metal. It is something to do.

Material adjustment refers to adjusting the composition and temperature of molten metal, and includes adding material adjustment materials to adjust the composition of molten metal, and mixing molten metals of different materials melted in other melting furnaces. This includes forms in which the temperature of the molten metal is adjusted by heating it with a heater.

In the case of molten metal or steel base, the material adjusting material may be carbon, silicon, mankan, chromium, sulfur, etc., or a adjusting material containing these.

The intermediate chamber, which serves as the material adjustment chamber, contains alloying elements, the composition of the molten metal,
A stirring means may be provided to make the temperature distribution of the molten metal uniform. As the stirring means, for example, means for rotating the molten metal in the tangential direction of a circle, means for blowing gas such as argon gas or nitrogen gas into the molten metal, and means for mechanically stirring the molten metal can be employed as appropriate.

The number of intermediate chambers can be selected as appropriate, and may be two, three, or even four or more, as long as at least one of them is a material adjustment chamber.

Note that each of the above-mentioned chambers can be partitioned and formed using partition walls made of a fireproof material.

[Function] The function of the tundish of the present invention will be explained together with its usage method. First, the tandate is placed above the casting mold. In this state, the molten metal is fed from the ladle to the tundish drain. Then, the molten metal flows into each intermediate chamber.

The molten metal that has flowed into the first intermediate chamber flows into the first melt chamber through the first communication passage, and is further discharged from the first melt outlet to the outside of the tundish. The molten metal that has flowed into the other intermediate chamber flows into the second tapping chamber via the second communication path, and is further discharged from the second tap to the outside of the tundish.

Material adjustment is performed in the intermediate chamber that serves as the material adjustment chamber. Therefore, the molten metal in the intermediate chamber serving as the material adjustment chamber is different from the molten metal in other intermediate chambers.

[Example] An example of the continuous casting tundish of the present invention will be described below with reference to FIGS. 1 and 2.

The tundish of this embodiment is formed of a container-shaped iron shell and a refractory layer laminated on the inner surface of the iron shell. This tandaitshu consists of a hot water dripping chamber 13 and a first intermediate chamber 14.
It also includes a second intermediate chamber 15, a first hot water outlet chamber 16, and a second hot water outlet chamber 17.

The hot water outlet 13 receives the molten metal from the ladle 18, and is partitioned from the first intermediate chamber 14 and the second intermediate chamber 15 by a partition wall 19 made of refractory material. The first intermediate chamber 14 and the second intermediate chamber 1
5 are partitioned by partition walls 20 and are isolated and independent from each other. An intermediate communication passage 21 is formed in the partition walls 194 and 7, and the first intermediate chamber 14 communicates with the dripping chamber 13 via the intermediate communication passage 21.

The second intermediate passage 15 communicates with the dripping chamber 13 via another intermediate communication passage 22 .

As shown in FIG. 2, the first hot water outlet 16 is provided on the end side of the tundish, and communicates with the first intermediate chamber 14 via a first communicating passage 25. As shown in FIG. The first communicating path 25 is connected to the partition wall 19
．． It is formed in the gap between the upper weir 26 and the upper weir 27, which are integrally formed with the refractory layer forming the refractory layer 20 and the like. A first tap 29 in the form of a through hole is formed in the bottom wall of the first tap chamber 16 . A first immersion nozzle 30 is installed at the bottom of the first tap 29.

The second hot water tapping chamber 17 is provided on the end side of the tundish, and communicates with the remaining second intermediate chamber 15 via the second communication passage 31. The first communicating path 31 is formed in a gap between an upper weir 32 and an upper weir 33 that are integrally formed with the refractory layer. A second tap opening 34 in the form of a through hole is formed in the bottom wall of the second tapping chamber 7. There is a second tap at the bottom of the second tap 34.
An immersion nozzle 35 is equipped.

In this embodiment, the first intermediate 14 is a material adjustment seedling that adjusts the material quality of the molten metal by adding a material adjustment material. As the material adjustment material, carbon, silicon, manganese, chromium, sulfur, etc. alone, or adjustment materials containing these can be used. A crucible-shaped mixing section 38 having a cylindrical tank 37 is provided in the first intermediate chamber 14 . here,
The molten metal that has passed through the intermediate communication path 21 flows into the cylindrical tank 37, turns as it flows through the inner surface 37a of the tank 37, and is discharged from the passage 37c.

The function of the tundish of this embodiment will be explained along with its usage. First, the tandate is installed in continuous casting equipment, and the first casting mold 40 and the second casting mold 4 are installed.
Position it above 1. In this state, ladle 18 to 155
High-temperature copper-based molten metal of about 0 to 1600'C (material 5CR)
420, sulfur 0°012%) is supplied to the draining chamber 13 of the tundish. Then, the molten metal passes through the intermediate communication path 21 and flows into the first intermediate chamber 14, and also flows into the intermediate communication path 2.
2 and flows into the second intermediate 15. Here, the first
The molten metal in the intermediate chamber 14 passes through the first communicating path 25 and flows into the first tapped metal ¥16. On the other hand, the molten metal in the second intermediate chamber 15 is
It passes through the communication path 31 and flows into the second hot water tapping chamber]7. At this time, floating objects such as slag are dammed up by the partition wall 19. Therefore, floating objects such as slag are in the intermediate chamber 14.15 and in the outlet chamber 16.17.
Intrusion into the side will be avoided as much as possible.

In this embodiment, the molten metal in the first tapping chamber 16 is discharged from the first tapping port 29 through the first immersion nozzle 30 into the first casting mold 40, and becomes a semi-solidified piece, and eventually a solidified piece, and the first continuously cast piece 42 ( Material 5CR420, sulfur 0.025%) is formed. On the other hand, the molten metal in the second tapping chamber 17 passes from the second tapping port 34 to the second immersion nozzle 34 and enters the second casting mold 4.
It is discharged into a semi-solidified piece, and eventually becomes a solidified piece, and the second
Continuously cast piece 43 (material 5CR20, sulfur 0.012%
) is formed.

By the way, in this embodiment, the first intermediate chamber 1 serving as the material adjustment chamber
4, a material quality adjusting material is added. The material conditioning agent added is sulfur, and its shape is a sulfur wire wrapped in iron tape. In this example, the material adjusting material was added into the tank 37 of the mixing section 38 using an automatic feeder. Here, the molten metal that has flowed into the mixing section 38 from the intermediate communication path 21 flows along the inner surface 37a of the cylindrical tank 37 of the mixing section 38 and turns, and the molten metal flows through the passage path 37c.
It is discharged from. Therefore, due to the swirling of the molten metal, the molten metal and the material quality adjusting material are effectively mixed, and the uniformity of the molten metal composition is improved.

As described above, if continuous casting is carried out using the tundish of this embodiment, the molten metal in the first intermediate hole 14, which becomes the material adjustment chamber, and the molten metal in the other second intermediate hole 15 are different in material. Therefore, the material of the first continuously cast piece 42 and the material of the second continuously cast piece 43 are different. Therefore, even though molten metal of the same composition is supplied to the tundish, continuously cast pieces 42 and 43 having two types of materials can be obtained.

[Other Examples] The tundish of the Ikensui invention is not limited to the above-mentioned embodiments, but can be implemented with appropriate modifications as necessary without departing from the scope of the invention. For example, you can do as follows.

In the embodiment described above, the number of first intermediate chambers 14, the number of second intermediate chambers 1
The number of 5's is 1. However, the present invention is not limited to this, and the first intermediate solstice 14 may be formed of a plurality of mutually independent chambers, and the second intermediate solstice 15 may be formed of a plurality of mutually independent chambers.

In addition, as shown in FIG. 3 (A>(B)), the intermediate communication path 21
In order to drain the molten metal that has flowed into the cylindrical tank 37 from the hole 37, a passage passage 37G is provided on the side opposite to the intermediate communication passage 21.
may be formed.

As shown in FIG. 4, bubbling treatment is performed by blowing argon gas through the porous portion 51 formed on the bottom wall of the first intermediate chamber 14 to effectively mix the material conditioning material and the molten metal of the first intermediate chamber 14. You can decide.

In addition, as shown in FIG.
6.3 intermediate chambers 6 communicating individually via 57.58
0.61.62 are installed in parallel, and an intermediate chamber 60.61.6 is installed in parallel.
3 which individually communicates with 2 through communication passages 64, 65, 66.
The hot water tap rooms 68, 69, 70 may be arranged in parallel. In this case, the hot water outlets 68a of the three hot water chambers 68, 69, and 70
, 69a, and 70a, the molten metal is separately discharged to the outside of the tundish. Thus, three continuous cast pieces are formed. In the example shown in FIG. 5, at least one of the intermediate chambers 60 to 62 can be a material adjustment chamber. The additive component may be wire or granular as in this embodiment, but if a separately melted molten metal is added, the component can be changed significantly, and high-speed casting can be supported.

[Effect of the Invention 1] By using the continuous casting tundish of the present invention, the material of the molten metal in the intermediate chamber serving as the material adjustment chamber can be made different from the material of the molten metal in the other intermediate chambers.

Therefore, even though molten metal of the same composition is supplied to the tundish, continuous cast pieces having at least two types of materials can be obtained. Therefore, it is suitable for producing small lots of slabs, billets, etc. of different materials.

[Brief explanation of drawings]

Figures 1 and 2 show one embodiment of the present invention; Figure 1 is a plan view of a tundish, Figure 2 is a sectional view showing how it is used, and Figure 3 (A> shows the main parts of another example). 3(B) is a sectional view of the same. FIG. 4 is a sectional view of another example of stirring means. FIG. 5 is a plan view of an example in which three intermediate chambers are formed. In the figure, 13 is a hot water dripping chamber, 14 is a first intermediate chamber, and 15 is a second
In the intermediate chamber, 16 is a first tapping chamber, 17 is a second tapping chamber, 29 is a first tap, and 34 is a second tap.

Claims (1)

[Claims] (1) A pouring chamber for receiving the molten metal in the ladle, at least two mutually independent intermediate chambers communicating with the pouring chamber, and communicating with one intermediate chamber via a first communication passage for casting the molten metal. a first tap chamber having a first tap for discharging hot water into the mold;
The first chamber has a second outlet that communicates with the remaining intermediate chamber via a second communication passage and discharges the molten metal into the casting mold.
A tundish for continuous casting, comprising a second tapping chamber independent of the tapping chamber, and at least one of the intermediate chambers being a material adjustment chamber for adjusting the material of the molten metal.