JP2002286376A - Cover for high temperature container and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover for a high temperature container in which rigidity of a cover itself is high and even when a lined refractory is exposed to a high temperature, a crack and damage and fallout are prevented from occurring, and also the cover is capable of being manufactured is a short time with excellent workability. SOLUTION: An iron shell forming an outer shell of a cover consists of an upper surface part and a side part (an iron shell upper surface 11 and an iron shell side 12). A refractory is lined with the shell, and raw material power 18, the grain of which is fine, of raw material power of which a refractory consists of is segregated in the vicinity of the upper part of the refractory and raw material power 19 the grain of which is coarse is segregated in the vicinity of the lower part of the refractory to form the cover of the high temperature container. The iron shell which consists of the upper surface part of the cover can be removed, or a core 15 is set at the inner side of the iron shell which consists of the side part of the cover. It is preferable that a support tool 16 to support the refractory is hooked at the core 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid for a high-temperature container for storing molten metal and a method for producing the same, and more particularly, to a lid for a high-temperature container such as a ladle or a tundish for temporarily storing molten steel. It relates to the manufacturing method.

[0002]

2. Description of the Related Art Hot metal obtained by reducing iron ore in a blast furnace is introduced into a converter while its components, temperature and the like are adjusted and kept in a molten state at a high temperature. Then, the molten steel obtained by removing impurities in the converter is finally cast by continuous casting and solidified to form a slab, billet or bloom.

[0003] In the above-described series of manufacturing steps, it is necessary to temporarily store hot metal and molten steel in a container during the process. For example, when transferring hot metal taken out of a blast furnace to a converter, the hot metal is accommodated in a torpedo car (mixed iron wheel) and transported. In addition, when performing continuous casting, a tundish is provided immediately before supplying molten steel to the mold to adjust the supply amount of molten steel to the mold and to separate slag and inclusions, and temporarily house the molten steel. .

[0004] As described above, hot metal and molten steel are sometimes stored in a container (a torpedo car, a tundish, etc.) during the process.
The container body (steel skin) is easily damaged. Therefore, a refractory is lined inside the steel shell, and a heat insulating material is provided between the steel shell and the refractory to prevent the temperature of the hot metal and the molten steel from lowering as necessary. Hereinafter, a conventional tundish will be specifically described by way of example.

FIG. 1 is a schematic view showing a longitudinal section of a conventional tundish. As shown in FIG. 1, the tundish includes a tundish main body 8 and a lid 1, and the lid 1 is installed on the tundish main body 8 via a sealing material 6. Both the tundish body 8 and the lid 1 have refractory inside
4 is attached so that the steel 2 and 8 do not come into direct contact with the molten steel.

FIG. 2 is a schematic diagram showing a longitudinal section of a conventional tundish lid in detail. A support 3 for supporting the refractory is attached to the inner surface of the upper surface (iron shell 2) of the lid, and the refractory is arranged inside the shell 2 so as to cover the support 3. Normally, such a lid of a tundish is turned upside down of the steel shell 2 integrally formed including the flange 5, that is, the upper side of the lid is turned down, and the support 3 is welded or screwed to the steel shell 2. After fixing, the refractory is poured into the inside of the steel shell 2 and dried to manufacture.

[0007] However, when the conventional tundish lid thus manufactured is actually used, cracks are generated near the lower portion of the refractory, and in some cases, wear and fall are caused.
Further, if the refractory is damaged or dropped, the steel shell is directly exposed to a high temperature, so that the steel shell is deformed and cannot be reused.

In addition, such a lid has some other problems in production. As described above, the support for supporting the refractory has to be welded directly to the steel shell or screwed, which has been time-consuming to manufacture. In addition, the workability is poor because it is installed inside the steel skin. In addition, when manufacturing and using or repairing, it is necessary to reverse the top and bottom of the lid, which is troublesome in work and involves a danger.

In order to improve the lid of a high-temperature container such as a tundish, Japanese Unexamined Patent Publication No. Hei 7-284914 discloses a technique in which a core bar is provided on an iron shell composed only of a side portion, and a fireproof is provided above and below the core bar. The invention of a lid of a high-temperature container in which a support (refractory support metal) for supporting an object is attached and a refractory is installed in a hollow portion of a steel shell is disclosed. The lid of the high-temperature container can be used by alternately exposing the upper and lower surfaces of the lid to the high-temperature side, so that the life of the lid is prolonged, and thermal deformation of the lid is suppressed, and the lid is corrected.

[0010]

However, the lid of the high-temperature container described in JP-A-7-284914 has a problem that the rigidity of the lid itself cannot be maintained because there is no iron skin at the portion corresponding to the upper surface of the lid. There is. Normally, the outer shell of the lid also plays a role in maintaining the mechanical strength of the lid itself. In particular,
In the case of the lid of the high-temperature container described in Japanese Patent Application Laid-Open No. 7-284914, rigidity higher than that of a normal lid is required because the upper and lower surfaces of the lid are alternately rotated and used. However, the lid of this high-temperature container has only a lattice-shaped core, and it is impossible to provide the core with sufficient rigidity to withstand use.

Further, a support is attached to the metal core, but since the metal core is in a lattice shape, the support can be mounted only by welding, and the mounting is performed above and below the metal core. Because of the necessity, not only takes a long time to manufacture, but also has a drawback that workability is poor.

An object of the present invention is that the lid itself has high rigidity,
Provided is a lid for a high-temperature container that can be manufactured in a short time without producing cracks, damage, or falling off even when the lined refractory is exposed to a high temperature, and can be manufactured in a short time, and a method for manufacturing the same. It is in.

[0013]

The present inventors first investigated the cause of cracks in the refractory of a conventional tundish lid. Then, when the structure of the cracked refractory was examined, it was found that the size of the raw material powder composed of aggregate, cement, and the like was different depending on the vicinity of the upper portion and the lower portion of the refractory. In other words, as shown in FIG.
However, it was found that the raw material powder 9 having a fine grain was segregated near the lower portion.

In general, when the size of the raw material powder is small,
The strength of the refractory decreases. Therefore, if the raw material powder having high strength is segregated near the lower portion of the refractory exposed to high temperature and the raw material powder having finer particles is segregated near the upper portion, no crack is generated in the refractory.

Then, a method for manufacturing such a high temperature container lid was devised. Conventionally, the refractory of the lid has been manufactured by inverting the top and bottom of the iron shell forming the outer shell of the lid, pouring the refractory from a direction hitting the lower side of the lid, and drying the refractory.
However, when a refractory solidified by such a method is produced, a coarse-grained raw material powder (a raw material powder having a large specific gravity) segregates to a lower portion, and a fine-grained raw material powder (a raw material powder having a small specific gravity) segregates to an upper portion. When the refractory is turned upside down so that it can be used as a lid, a large amount of raw material powder gathers near the lower part of the refractory and a large amount of raw material powder gathers near the upper part of the refractory.

Therefore, if the refractory is poured into the steel shell from the direction in which it hits the upper side of the lid, a large amount of raw material powder gathers near the lower part of the refractory and a large amount of raw material powder near the upper part of the refractory. I thought it would be. However, in the case of a conventional steel shell, the upper surface of the steel shell (hereinafter referred to as the upper surface of the steel shell)
This cannot be done because the and the side portion (hereinafter referred to as a steel skin side) are integrally formed. Therefore, if the steel skin is divided into the steel skin upper surface and the steel skin side, the steel skin upper surface is removed, the refractory is poured, and the steel skin upper surface is attached to the steel skin side,
Since coarse raw material powder can be collected in the vicinity of the lower part of the refractory, there is no risk of cracks or the like being generated.

On the other hand, the inventors have studied a method of manufacturing a lid of a high-temperature container with better workability and in a short time. As described above, in the case of the conventional lid, the support is fixed to the inside of the upper surface of the steel by welding or screwing, and thereafter, the refractory is poured into the inside of the steel and dried to manufacture. At this time, since welding or screwing is troublesome, if this step can be simplified, the lid can be efficiently manufactured in a short time. Therefore, the support is not provided inside the upper surface of the steel, and the support is provided using the side of the steel.

In particular, when the refractory is poured from above the lid and the upper surface of the steel is attached to the side of the steel as in the present invention,
If the support is provided on the upper surface of the steel, the support is pushed into the refractory, and the upper surface of the steel is attached to the side of the steel. If the refractory begins to dry and solidify, forcing the support into the refractory will cause the refractory to be distorted, leading to a reduction in the strength of the refractory. . Therefore, no support is provided inside the upper surface of the steel shell,
Providing the support using the steel skin side is also effective when attaching the steel skin top surface to the steel skin side surface.

The present invention has been completed based on the above findings, and the gist of the present invention is to provide a lid for a high-temperature container described in the following (1) and (2) and a high-temperature container described in (3). In the method of manufacturing the lid.

(1) A lid of a high-temperature container in which a shell constituting an outer shell of the lid is composed of an upper surface portion and a side portion, and a refractory is lined with the iron shell. This is a lid of a high-temperature vessel in which fine-grained raw material powder is segregated near the upper portion of the refractory and coarse-grained raw material powder is segregated near the lower portion.

[0021] In (1), the metal shell forming the upper surface of the lid can be removed, or a metal core is provided inside the steel shell forming the side surface of the lid. It is preferable that a support for supporting the refractory is hung on the cored bar.

(2) A lid of a high-temperature container in which a refractory is lined with an iron shell, wherein a core is provided inside an iron shell constituting a side portion of the lid, and the refractory is supported by the core. Of the high-temperature container on which the support for the container is hung.

In (1) and (2), it is preferable that a heat insulating material is provided between the refractory and the steel shell.

(3) A method for manufacturing a lid of a high-temperature container in which a shell constituting an outer shell of the lid is composed of an upper surface and side surfaces, and a refractory is lined with the iron shell, wherein the side surfaces of the lid are configured. A support is hung on a metal core fixed to the inside of the steel shell to be poured, refractory is poured from the top side of the lid, and the steel shell forming the top part of the lid is attached to the steel shell forming the side parts of the lid. This is a method for manufacturing a container lid.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a lid for a high-temperature container and a method for producing the same. Here, the lid of the high-temperature container refers to a lid of a container that accommodates a material in a high temperature state such as molten metal, and in particular, the one that accommodates the container is not limited.

FIG. 3 is a side view schematically showing one embodiment of the lid of the high-temperature container of the present invention. The lid of the high-temperature container has a structure in which the outer shell of the lid is composed of an upper surface (upper surface 11) and side surfaces (upper surface 12), and a refractory is lined inside the outer shell. Have. A flange 13 serving as a connection portion with the main body of the high-temperature vessel is provided at a lower portion of the steel shell side surface 12 to be wider than the steel shell side surface 12. On the other hand, the upper part of the steel shell side 12 is
11 and bolt 14 are connected.

A fixed metal core 15 is provided inside the steel side surface 12.
Is attached, and the support 16 is hung on the cored bar 15.
A refractory is lined inside the steel so as to surround the support 16. Further, a heat insulating material 17 is provided between the upper surface 11 of the steel shell and the refractory.

In the lid of the high-temperature container according to the present invention, among the raw material powders constituting the refractory, the fine-grained raw material powder 18 is located near the upper portion of the refractory, and the coarse-grained raw material powder 19 is located near the lower portion of the refractory. Segregated. Raw material powder with high strength and coarse grains19
However, segregation in the vicinity of the lower portion exposed to high temperature makes it difficult for cracks to occur in the refractory, and improves the durability of the lid.

Here, the raw material powder is a powder used as a raw material of the refractory, and specifically refers to cement or the like used as an aggregate or a binder. Raw material powder of fine grain 18
The term “raw material powder” refers to a raw material powder having a particle size smaller than the average particle size of the raw material powder, and includes finely crushed aggregates, crushed aggregates, cement, and the like. It is preferable that the raw material powder 18 having a fine particle size has a particle size of 0.075 mm or less. In addition, the coarse raw material powder 19 refers to a raw material powder having a particle size larger than the average particle size of the raw material powder. Coarse raw material powder 19 has a particle size of 3 mm or more and an average particle size of 4.5 mm
It is preferable that it is above. Then, in order to obtain sufficient durability of the lid, it is preferable that the difference between the average particle diameters of both raw material powders is 2 mm or more. In general, the raw material powder used for refractories has an aggregate having an average particle size of about 4.5 mm and about 1.5 mm and a particle size of 0.
Raw powder of fine powder of 075mm or less (aggregate, cement, etc.)
Is used. Therefore, if the average particle size near the upper portion of the refractory is 1 mm or less and the average particle size near the lower portion of the refractory is 3 mm or more, sufficient durability can be obtained.

The lid of the high-temperature container according to the present invention is preferably configured such that the iron shell (iron shell upper surface 11) constituting the upper surface of the lid can be removed. The object of the present invention can be achieved if the refractory raw material powder is segregated as described above. for that reason,
The production method is not limited as long as the raw material powder is segregated. However, if the steel shell upper surface 11 can be removed, the refractory can be poured from the upper side of the lid when producing a solidified refractory, so that the fine-grained raw material powder 18 can be used without any special operation. Coarse raw material powder 19 segregates near the upper portion of the refractory and near the lower portion of the refractory. Also, when replacing and repairing a refractory which is a consumable part, the steel shell upper surface 11 can be removed and crushed from the upper side, so that the repair time can be shortened.

In the lid of the high-temperature container according to the present invention, a metal core 15 is provided inside a steel shell (iron steel side surface 12) constituting a side portion of the lid, and the core metal 15 supports the refractory. It is preferable that the support member 16 is hung. Even if the support 16 is provided in this manner, the refractory can be supported with sufficient strength, similarly to the case where the support 16 is attached to the steel shell upper surface 11. Since welding or screwing is not required, the lid can be manufactured simply and efficiently.

The metal core is provided so as to connect the four iron skin side surfaces 12. FIG. 3 shows an example of the core bar 15 in which the steel bar side surfaces 12 facing each other are connected by a single rod. However, the present invention is not limited to such an embodiment. It may be provided, especially if the support 16 can be hung,
The shape of 15 is not asked.

FIG. 4 shows a core 20 and a support used in the present invention.
It is the perspective view which represented 21, 22, and 23 typically. The shapes of the supports 21, 22, and 23 are not limited as long as they can support the refractory. In order to support the refractory, the shape of the tip of the support may be made bifurcated. Also, support 2
1, 22, and 23 are hung on the core 20, but the tip to be hung on the core 20 is shaped to be hooked on the core 20, such as a key 21, 22, or a ring 23. is necessary.

When the support 16 is hooked on the metal core 15, the support 16 is directed in the thickness direction of the lid by its own weight. If the refractory is poured in this state, the refractory reinforced by the support 16 can be obtained. When the steel upper surface 11 is attached to the steel side surface 12, it is only necessary to attach the flat upper surface 11 (with no support attached), so that the support 16 is pushed into the refractory. There is no distortion and no decrease in the strength of the refractory.

The support 16 hung on the metal core 15 flows a refractory from the upper side of the lid into the inside of the steel skin side 12 as in the present invention, and the raw material powder 18 having a fine grain is refractory. In the vicinity of the upper part of the refractory, it is preferably used when producing a lid of a high-temperature vessel in which coarse-grained raw material powder 17 is segregated in the vicinity of the lower part of the refractory. Even if the lid is made by inverting the top and bottom of the steel shell integrally molded with 12 and pouring refractory into it, if the support 16 hung on the metal core 15 is used, the refractory with sufficient strength is used. Can be supported. However, in such a case, the support 16
The metal core 15 is provided on the lower side of the steel side surface 12 (when the iron is upside down, the upper side of the steel side surface 12) so that the metal core faces the thickness direction of the lid (the direction of the steel upper surface 11). There is such a device.

In the lid of the high-temperature container according to the present invention, it is preferable that a heat insulating material 17 such as kao wool is provided between the refractory and the steel shell. FIG. 3 shows an example in which the heat insulating material 17 is provided between the refractory and the steel shell upper surface 11. In addition, the heat insulating material 17 may be provided between the refractory and the steel shell side surface 12. By providing the heat insulating material 17, a decrease in the temperature of the molten metal stored in the high-temperature container can be suppressed.

In the lid of the high-temperature container according to the present invention, the outer shell of the lid has an upper surface and a side surface (an upper surface 11 and an outer surface 12), and the refractory material is formed on the outer surface. This is a method for manufacturing a lid of a lined high-temperature container, in which a support 16 is hung on a metal core 15 provided inside a steel shell (iron shell side surface 12) constituting a side portion of the lid, and the support member 16 is placed on the upper side of the lid. It is preferable that the refractory be poured into the container and the steel (the steel upper surface 11) constituting the upper surface of the lid be attached to the steel (the steel side 12) constituting the side surface of the lid.

In manufacturing, first, the steel skin side surface 12 is prepared. The steel skin side surface 12 may have any shape as long as it has a shape constituting the side surface portion of the lid. If necessary, a flange 13 may be attached to a connection portion between the high-temperature container and the main body. Further, a metal core 15 is provided on the inside of the steel skin side surface 12. As described above, the shape of the metal core 15 is not particularly limited.

A support 16 is hung on the cored bar 15.
The shape of the support 16 is not particularly limited as described above. In the case of the supports 21 and 22 having the key-shaped portions shown in FIG. 4, they may be simply hung on the metal core 15. However, when the support 23 having the ring-shaped portion is used, the ring portion is previously attached to the metal core 15. It is necessary to hang the support tool 16 on the core metal 15 through. Such a core metal 15 is oriented in the thickness direction of the lid by its own weight.

Subsequently, a refractory is poured. At this time, the support 16 is oriented in the thickness direction, and its direction is maintained even after pouring, so that when the refractory solidifies, the refractory is supported.
It is supported by 16 and is strengthened compared to the case where there is no support 16. Further, after the refractory is solidified, it is preferable to provide the heat insulating material 17 on the refractory.

Finally, the upper surface 11 is attached to the side surface 12. The steel skin upper surface 11 can increase the rigidity of the lid itself. The mounting method is not particularly limited, but it is preferable to use bolts. If the bolts are used, the upper surface 11 of the steel can be easily removed compared to the case of mounting by welding, etc., so when replacing refractories, crushing with a breaker etc. from the upper side becomes possible, Shortening becomes possible.

[0042]

The lid of the high-temperature container according to the present invention has high rigidity and does not crack, damage or fall off even if the lined refractory is exposed to a high temperature. Can be extended. Furthermore, when manufacturing the lid of the high-temperature container according to the present invention, the workability is good, the manufacturing time can be greatly reduced, and the dismantling time when refractory is replaced can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a vertical section of a conventional tundish.

FIG. 2 is a schematic view showing a longitudinal section of a conventional tundish lid in detail.

FIG. 3 is a side view schematically showing one embodiment of a lid of the high-temperature container of the present invention.

FIG. 4 is a perspective view schematically showing a cored bar and a support employed in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tundish lid 2 Iron shell 3 Support 4 Refractory 5, 7 Flange 6 Sealing material 8 Tundish body 9, 18 Fine raw powder 10, 19 Coarse raw powder 11 Iron upper surface 12 Iron shell side 13 Flange 14 Bolt 15, 20 Core 16 Support 17 Heat insulator 21, 22 Key-like support 23 Ring-like support

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaki Tange 3-2-1 Asano, Kokurakita-ku, Kitakyushu-shi, Fukuoka Prefecture Inside Wake Fire Engineering Co., Ltd. (72) Inventor Jo Matsushita 993-5 Nishisho, Wakayama-shi, Wakayama Prefecture No. (72) Inventor Koichi Kamiya 1 Konomicho, Kokurakita-ku, Kitakyushu-shi, Fukuoka F-term (reference) 4E014 AB01 BC01 4K051 AB09 MA01

Claims (6)

[Claims] 1. A high temperature vessel lid in which a shell constituting an outer shell of the lid is composed of an upper surface portion and a side surface portion, and a refractory is lined with the iron shell. A lid for a high-temperature container, wherein fine-grained raw material powder is segregated near the upper part of the refractory, and coarse-grained raw material powder is segregated near the lower part of the refractory. 2. The high-temperature container lid according to claim 1, wherein a steel shell constituting an upper surface portion of the lid can be removed. 3. A metal core is provided inside a steel shell constituting a side portion of the lid, and a support for supporting a refractory is hung on the metal core. 4. The lid of the high-temperature container according to 1. 4. A lid for a high-temperature container in which a refractory is lined with an iron shell, wherein a core is provided inside an iron shell constituting a side portion of the lid, and the refractory is supported on the core. A lid for a high-temperature container, wherein the support is hung. 5. The high-temperature container lid according to claim 1, wherein a heat insulating material is provided between the refractory and the steel shell. 6. A method for manufacturing a lid for a high-temperature container in which a shell constituting an outer shell of the lid is constituted by an upper surface portion and a side surface portion, and a refractory is lined with the iron shell, wherein the side surface portion of the lid is constituted. Hang the support on the metal core provided inside the steel shell, pour the refractory from the top side of the lid, and attach the steel shell that constitutes the top part of the lid to the steel shell that constitutes the side part of the lid. A method for producing a lid for a high-temperature container.