JP2000045005A - Stave cooler and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more inexpensively provide a long-life stave cooler which can be held for a long period by forming refractory materials of austenitic heat resisting stainless steels sheets. SOLUTION: This stave cooler is constituted by molding refractory materials of a rectangular shape of the austenitic heat resisting stainless steels, erecting a plurality of these refractory materials 3 of which the longer side is set in the height direction at a prescribed angle, disposing the refractory materials in a zigzag form and internally chilling them integrally with one side of the stave cooler. This process for producing the stave cooler consists of erecting a plurality of the connected refractory materials which are formed by arranging a form at the circumference of a stave cooler body 1, disposing the refractory materials 3 of a rectangular shape consisting of the austenitic heat resisting stainless steels in parallel and fixing their respective longer sides by connecting rods, at a prescribed angle in such a manner that the longer side of the respective refractory materials 3 is to be the height direction, disposing the refractory materials on the stave body within the frames via the connecting rods in such a manner that the connecting rods are made zigzag in the height direction and pouring molten metal into the form, thereby internally chilling the refractory materials into the stave cooler.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stove cooler for cooling a furnace body used by being buried in a wall of a metallurgical furnace such as a blast furnace.

[0002]

2. Description of the Related Art Conventionally, a stave cooler used as a furnace wall cooling device of a metallurgical furnace such as a blast furnace is worn or damaged when used for a long period of time. It is known that when such wear or breakage occurs, the cooling function is reduced, the heat load on the furnace shell is increased, and eventually the steel shell cracks.

[0003] Generally, as shown in Fig. 9, a conventional stave cooler 14 has a casting 1 (mainly spheroidal graphite cast iron) forming a stave main body, in which a cooling pipe 2 is cast outside the furnace, and a stave cooler 14 is provided inside the furnace. A refractory brick 16 is cast as a refractory material. And this stave cooler is an outer skin 1
3 and fixed inside. Further, after the stave cooler is installed on the steel shell, the structure in which the refractory brick 15 is further stacked on the inside of the furnace through the stamp material, and the structure shown in FIG.
The portion corresponding to the refractory bricks stacked in the furnace as shown in FIG.
Has been devised so as to be sandwiched one by one by the cast ribs 17 provided in the furnace, and the holding power of the brick 16 is enhanced.

[0004] The function of the refractory brick cast into the stave cooler is to provide excellent durability against high-temperature gas flow and material falling in the furnace, and to prevent a decrease in thermal efficiency due to heat removal from the furnace. Heat insulation performance is required. Cooling water is passed through the cooling pipe to cool the furnace wall and to reduce the temperature of the stave base material and refractory brick inside the furnace to maintain strength. The increase in wear rate is suppressed.

However, in a structure in which refractory bricks are stacked inside the furnace, the bricks have no support, and the structure is maintained only by the adhesive force between the bricks. In an environment with high abrasion, the bricks are partially or completely collapsed, and the life as a refractory structure is extremely short. In addition, in the structure of the cast-in brick, the ability to support the brick is weak because it is only sandwiched between the ribs of the casting via a cushioning material (ceramic felt, etc.) to prevent cracking of the brick. The cooler expands and contracts, and the gap of the casting ribs causes the bricks to fall off, break, or fall off.

[0006] As described above, the operation becomes unstable after the refractory brick is worn out, and the stave cooler is subjected to thermal load and abrasion with only the casting base metal, resulting in shortening the life of the blast furnace.

[0007]

As a solution to this problem, Japanese Patent Laid-Open Publication No. Hei 8-120313 discloses a method in which a brick having a circular or polygonal cross section is provided on the surface of the brick in a direction perpendicular to the surface of the stave cooler and at a distance from each other. Structure in which the brick is wrapped from all directions by disposing
No. 7 discloses a structure in which a brick supporting anchor is fitted into a tapered through hole provided substantially in the center of a refractory brick, and cast-in bricks are integrally arranged in a staggered manner.

[0008] However, it is very difficult and time-consuming to arrange the bricks individually and at regular intervals as described above. Also, in the case of bricks, it is necessary to attach a cushioning material such as ceramic felt to prevent cracking due to thermal shock at the time of cast-in casting, and the work of attaching a cushioning material for each single brick is very inefficient. Although the possibility of the bricks falling out due to the structure in which the brick is wrapped from all directions is small, there is a concern that cracks may occur due to the compression of the casting ribs and that the bricks may fall off.

Further, in Japanese Utility Model Laid-Open No. 6-47347,
Using a stainless steel block as a refractory material, forming a plurality of groove-shaped engaging recesses inside the furnace of the stave cooler body, applying a gap adjusting mortar on the inner surface of the recess, fitting a stainless steel block having a trapezoidal cross section. There is disclosed a fixed structure, and a structure in which an engagement recess having a square cross section is formed, a stainless steel block having a square cross section is fitted into the recess, and the furnace inner surface is welded to the stave cooler main body.

However, in any case, the work is performed after the concave portion is formed in the stave cooler main body, and the work efficiency is extremely poor because the stainless steel block is heavier than the brick. Further, if a stainless steel block having a trapezoidal cross section is fitted into the dovetail-shaped recess only, it is in the same state as a cast-in brick, and there is a concern that the stave cooler may fall off. Further, the stainless steel block having a square cross section is only for welding the surface, and when the welded portion is worn, there is a concern that the stainless steel block may fall off similarly to the stainless steel block having a trapezoidal cross section. Further, when the block is processed from a rolled stainless steel material, the cost increases.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a long-life stove cooler capable of holding a refractory material for a long period of time at a lower cost. The point is that a rectangular refractory material is formed from austenitic heat-resistant steel, a plurality of the refractory materials are erected at a predetermined angle with the long side being a height direction, and arranged in a staggered manner. A stave cooler characterized by being integrally cast on one surface of the stave cooler, and a formwork is arranged around the stave cooler body, and a rectangular refractory material made of austenitic heat-resistant steel is arranged in parallel. A plurality of connected refractory materials formed by fixing the long sides of the respective refractory materials with connecting rods are erected at a predetermined angle such that the long sides of each refractory material are in the height direction, and in the height direction. A method for manufacturing a stave cooler, comprising disposing a refractory material by disposing a molten metal in a mold by disposing it on a stave body in a mold via the connecting rod so as to form a staggered shape. .

The refractory material to be cast in the present invention is formed so that at least one surface thereof has a concave shape, and that the side surface of the refractory material has at least one or more through-holes. Alternatively, the surface of the refractory material may be coated with a ceramic coating of 50 or more per surface area to provide a stave cooler in which the refractory material is disposed.

The reason why the austenitic heat-resisting steel is selected as the refractory material in the present invention is that it has excellent abrasion resistance and crack resistance at high temperatures. The main types of wear of the refractory materials used in the stave cooler are wear due to the fall of the furnace interior material, cracking and spalling due to fluctuations in the heat load. According to the situation survey, 40 to 50 mm / year (for a life of 2 years) for cast-in bricks, 30 to 40 mm / year (for a life of 3 years) for cast bricks, and 8 to 10 mm / year for base metal made of spheroidal graphite cast iron. It is the wear rate of a year (lifetime 10 years).

The form of wear caused by falling of the furnace interior is considered to be sliding wear. Generally, the higher the hardness, the better the wear resistance. The hardness of austenitic heat-resistant steel is about 2-3 times that of spheroidal graphite cast iron, and higher wear resistance than spheroidal graphite cast iron as a base metal can be obtained. In addition, the above-mentioned wear rate of the brick part includes exfoliation due to cracks in addition to abrasion, and in the case of austenitic heat-resistant steel with high high-temperature strength and large toughness, crack resistance is also excellent, as a result A longer life stove cooler can be obtained than a conventional brick-cast structure.

In addition, by using a metal refractory material instead of the brick, the above-mentioned poor workability can be solved. That is, since the welding is enabled, the molding operation is facilitated, and the refractory material can be easily arranged independently at a constant interval. Further, in the case of heat-resistant austenitic steel, cracking does not occur at the time of cast-in casting, so that it is not necessary to attach a buffer material such as ceramic felt. By not using the cushioning material, the gap between the refractory material and the base metal is reduced, and the holding power of the refractory material by the base metal is increased. Austenitic heat-resistant steel can be cast as it is, but has a thickness of 300μ to prevent carburization of the surface layer and formation of intermetallic compounds.
It is desirable to apply a ceramic coating of about m or so.

Austenitic heat-resistant steel has a coefficient of thermal expansion about 3 × 10 ⁻⁶ / ° C. greater than that of spheroidal graphite cast iron as a base metal, but the staggered arrangement reduces the difference in coefficient of thermal expansion with the base metal. It is possible. The difference in the coefficient of thermal expansion can also be reduced by adjusting the unit length in the height direction of the stave cooler or by the above-described ceramic coating.

The reason why the long side of the refractory material is set in the height direction of the stave cooler is to increase the deformation resistance due to heat during the operation of the blast furnace. In the base material structure having the ribs 17 continuous only in the width direction as shown in FIG. 10, the resistance to thermal deformation is weak, and particularly the bending in the height direction is weak. As a countermeasure against this, the deformation resistance of the stave cooler is increased by forming a base material rib with the long side of the refractory material mainly in the height direction.

The reason why the austenitic heat-resistant steel is formed into a plate shape as the refractory material is to minimize the processing cost. The austenitic heat-resistant steel may be a rolled material or a cast material, but in the case of a rolled material, it can be used only by cutting in the height and thickness directions of the stove cooler while keeping the thickness of the plate (in the stave cooler width direction).

The direction in which the austenitic heat-resistant steel sheet is cast is perpendicular to the surface of the stave cooler, but as described above, the holding force of the base material is sufficient, but the casting is performed at an angle to the surface of the stave cooler. By rounding, the holding power can be further improved. In this case, the smaller the angle with the surface of the stave cooler, the lower the workability, so the angle was set to 45 ° to 90 °. In addition, in order to suppress the susceptibility of the base material crack to occur in the portion cast inside the base metal, use a grinder or the like so that the end does not become an acute angle.
It is desirable to keep a surface.

When an austenitic heat-resistant steel sheet is manufactured by casting, the degree of freedom of the shape is large, and the above-mentioned flat plate shape may be used. However, in order to further improve the holding force of the base material, a sheet material having a concave portion on at least one surface is used. It is desirable that In this case, the workability is further improved by casting the stave cooler vertically.

The thermal conductivity of austenitic heat-resistant steel is low among metal materials and about 1/2 that of spheroidal graphite cast iron, but about 3 times that of conventional refractory bricks. Therefore, the same heat insulation performance as firebricks cannot be obtained, but especially in the case of a stove cooler in a high heat load part, as described above, the wear rate of the brick is the life-limiting of the stave cooler body, and in the present invention, the austenite The emphasis is on the superiority of wear resistance and crack resistance of heat-resistant steel.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the drawings. FIG. 1 shows a stove cooler body 1 in which austenitic heat-resistant steel plates are arranged in a staggered manner as a refractory material 3 such that the long sides are in the height direction of the stave cooler 1. With such an arrangement, the difference in the coefficient of thermal expansion between the austenitic heat-resistant steel and the base metal (for example, spheroidal graphite cast iron) can be reduced, and thermal deformation of the entire stave cooler can be suppressed. Also, for example, by using a long plate material in the height direction of the stave cooler having a rectangular cross section of a refractory material of 30 mm × 150 mm or the like and forming base material ribs mainly in the height direction, resistance to bending in the height direction is increased. it can.

FIG. 2 shows the arrangement of the stave cooler 1 in the thickness direction of the austenitic heat-resistant steel plate 3 as a refractory material. Austenitic heat-resistant steel is superior in wear resistance and crack resistance compared to refractory bricks and has a slower wear rate, so that it may be shorter in the thickness direction than conventional refractory bricks, for example, a conventional 200 mm refractory brick layer is used. If
10 when the refractory material is heat-resistant austenitic steel
About 0 mm is sufficient.

FIG. 3 is a view taken in the direction of arrows AA in FIG. 1, and shows a state in which a flat austenitic heat-resistant steel plate as the refractory material 3 is cast at an angle to the surface of the stave cooler body 1. ing.

FIG. 6 shows a method of arranging heat-resistant austenitic steel sheets for one row in the width direction of the stave cooler before being cast. As the plate-shaped austenitic heat-resistant steel 3, for example, a stainless steel plate such as SUS304 is used. The width direction of the stave cooler has a gentle arc shape according to the inner shape of the blast furnace, but a wooden mold etc. that can place refractory materials at regular intervals according to this arc is manufactured, and the wooden mold etc. Insert the refractory material. Thereafter, the upper surface side to be cast into the base metal is welded 9 to, for example, a steel bar 8 to form a connected refractory material 10. The interval between the refractory materials 3 is desirably 30 mm or more in consideration of the flowability of the molten metal.

FIGS. 7 (a) and 7 (b) show a method in which one row of the connected refractory material 10 is placed on the mold 11 as one block. The refractory material 3 set by the steel bar 8 is arranged along the furnace inner shape of the mold 11, and the steel bar 8 connecting the refractory material 3 is fixed to the side wall of the mold 11. Since the steel bar 8 is cast into the base metal as it is,
It serves to promote the retention of the refractory material 2. In addition, in order to form a staggered arrangement, as shown in FIG. 7B, the blocks are arranged so that the width of one refractory material is shifted for each block 10, that is, every other row.

In the present invention, a cushioning material such as ceramic felt, which has been conventionally used in the case of refractory bricks, is not applied, and the surface of the refractory material 3 is rusted or stained by shot blasting or the like before being placed in a mold. After removing the like, the surface cast into the base metal, as shown in FIG.
A ceramic coating mold or the like is coated 12 and sufficiently preheated and dried before pouring. The ceramic coating 12 may be applied to the entire surface of the refractory material, but it is also possible to leave the uncoated portion to further enhance the adhesion to the base metal. In this case, for example, as shown in FIG. 8, it is desirable to alternately form a portion having a ceramic coating and a portion not having a ceramic coating to equalize the degree of adhesion between the base metal and the refractory material. The ceramic coating is most preferably 50% or more of the surface area per refractory material.
This is a stave cooler in which the present invention casts a refractory material such as a base metal, and in order to prevent thermal deformation of the stave cooler and deformation caused by a difference in thermal expansion between the base metal and the refractory material, a base material to be used is used. It is necessary to consider the difference in expansion between the metal and the refractory material. Therefore, the application amount of the ceramic coating was set to 50% or more per surface manifestation of one refractory material.

As the refractory material 3, as shown in FIG.
An austenitic heat-resistant steel plate 4 having a concave surface 5 on one side may be used. The austenitic heat-resistant steel sheet 4 having a concave surface on one side is manufactured by casting having a large degree of freedom in shape.
Use heat-resistant cast steel such as CH13. The method of installation in a mold and the like are the same as in the case of the austenitic heat-resistant steel plate having the above-described flat shape.

To further increase the holding power of the base metal, the refractory material may be an austenitic heat-resistant steel plate 6 having at least one or more through holes 7 as shown in FIG. In this case, the diameter of the through hole is desirably 30 mm or more in consideration of the flowability of the molten metal. The through hole 7 also plays a role of reducing the difference in thermal expansion coefficient between the base metal and the refractory material, in addition to improving the holding power.

[0030]

As described above, by using austenitic heat-resistant steel as a refractory material instead of the conventional refractory brick, the following excellent effects can be obtained. (1) Compared to refractory bricks and spheroidal graphite cast iron base materials, austenitic heat-resistant steels have excellent wear resistance and crack resistance, so that the wear rate of the inner surface of the stave cooler furnace can be reduced.

(2) Since the austenitic heat-resistant steel does not have cracks at the time of cast-in casting, the cushioning material required for refractory bricks is unnecessary, the adhesion to the casting base material is improved, and the stave cooler is thermally deformed. Can prevent the refractory material from falling off.

(3) As described above, the surface shape of the inside of the stove cooler furnace is maintained for a long time, and the stability of the blast furnace operation can be ensured because the raw material falling in the furnace can be smoothly maintained.

(4) Since the stave cooler can be restrained from being thermally deformed by staggering the plate-shaped refractory material which is long in the height direction of the stave cooler, it is possible to damage the cooling pipe and to remove the high temperature gas in the furnace. It can prevent the steel from leaking out,
The life of the blast furnace can be extended.

(5) Since refractory materials can be welded,
The arrangement in the mold becomes easy, and the work of attaching the cushioning material is not required, so that the overall work efficiency is improved and the cost can be reduced.

(6) A stainless steel plate having a simple flat plate shape can also be used, and the thickness of the stave cooler can be reduced by reducing the wear rate of (1), so that an inexpensive stave cooler can be manufactured. Become.

[Brief description of the drawings]

FIG. 1 is a front view of a stove cooler in which austenitic heat-resistant steel sheets (refractory materials) are arranged in a staggered manner such that long sides thereof are in a height direction in an embodiment of the present invention.

FIG. 2 is a side cross-sectional view of a stove cooler in which austenitic heat-resistant steel sheets are arranged in a staggered manner such that long sides thereof are in a height direction in an embodiment of the present invention.

FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 4 is a perspective view of a refractory material having a concave surface on one side.

FIG. 5 is a perspective view of an austenitic heat-resistant steel sheet having at least one or more through holes according to the present invention.

FIG. 6 is a perspective view of one row in the inward direction when the refractory material of the austenitic heat-resistant steel sheet of the present invention is fixed in a predetermined arrangement by bar steel.

FIGS. 7A and 7B are explanatory diagrams showing a state when the refractory materials arranged in FIG. 6 are incorporated in a mold.

FIG. 8 is a perspective view of a state in which a portion having a ceramic coating and a portion having no ceramic coating are alternately formed from a refractory material of austenitic heat-resistant steel.

FIG. 9 is a sectional view showing a conventional stave cooler.

FIG. 10 is a plan view showing a conventional stave cooler.

[Explanation of symbols]

 1: stove cooler body 2: cooling pipe 3: refractory material 4: old type refractory material 5: concave portion 6: refractory material provided with through hole 7: through hole 8: rod for connecting refractory material 9: welded portion 10: connected refractory material 11: Mold 12: Ceramic coating 13: Iron shell 14: Conventional stave cooler 15: Refractory 16: Cast brick 17: Rib

[Procedure amendment]

[Submission date] September 14, 1998 (1998.9.1)
4)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

[0003] Generally, as shown in Fig. 9, a conventional stave cooler 14 has a casting 1 (mainly spheroidal graphite cast iron) forming a stave main body, in which a cooling pipe 2 is cast outside the furnace, and a stave cooler 14 is provided inside the furnace. A refractory brick 16 is cast as a refractory material. And this stave cooler is an outer skin 1
3 and fixed inside. Further, after the stave cooler is installed on the steel shell, the structure in which the refractory brick 15 is further stacked on the inside of the furnace through the stamp material, and the structure shown in FIG.
As part also insert casting bricks 18 which corresponds to the refractory brick was piled up in the furnace as shown in 0, stave cooler body 1
Has been devised so as to be sandwiched one by one by the cast ribs 17 provided in the furnace, and the holding power of the brick 16 is enhanced.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008] However, it is very difficult and time-consuming to arrange the bricks individually and at regular intervals as described above. Also, in the case of bricks, it is necessary to attach a cushioning material such as ceramic felt to prevent cracking due to thermal shock at the time of cast-in casting, and the work of attaching a cushioning material for each single brick is very inefficient. In addition, the possibility of the brick falling out is small due to the structure that the brick is wrapped from all directions, but the compression of the casting rib
By that crack, the concern of spalling remains.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

Further, in Japanese Utility Model Laid-Open No. 6-47347,
A stainless steel block is used as a refractory material, a plurality of grooved engagement recesses are formed inside the furnace of the stave cooler body, a gap adjusting mortar is applied to the inner surface of the recess, and a stainless steel block having a trapezoidal cross section is fitted. There is disclosed a fixed structure, and a structure in which an engagement recess having a square cross section is formed, a stainless steel block having a square cross section is fitted into the recess, and the furnace inner surface is welded to the stave cooler main body.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

[0011]

Means for Solving the Problems The present invention has been made to solve the above problems, the stave cooler long term retention can life refractory material, and an object thereof is to provide lower cost. The point is that a rectangular refractory material is formed from austenitic heat-resistant steel, a plurality of the refractory materials are erected at a predetermined angle with the long side being a height direction, and arranged in a staggered manner. Te is a stave coolers, characterized in that it wrapped cast integrally on one surface of the stave cooler, also the mold placed around the stave cooler body, parallel rectangular refractory material consisting of austenitic heat-resistant steels Then, a plurality of connected refractory materials formed by fixing the long sides of the respective refractory materials with connecting rods are erected at a predetermined angle such that the long sides of each refractory material are in the height direction, and in the height direction. A stove cooler, which is arranged on the stave body in the mold via the connecting rod so as to be staggered, and the molten metal is poured into the mold and the refractory material is cast-in. is there

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

The refractory material to be cast in the present invention is formed so that at least one surface thereof has a concave shape, and that the side surface of the refractory material has at least one or more through-holes. may be a further, the surface of the refractory material is subjected to ceramic coating 50% or more per surface area, it is possible to provide a stave coolers arranged such refractory material.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

The form of wear caused by falling of the furnace interior is considered to be sliding wear. Generally, the higher the hardness, the better the wear resistance. The hardness of austenitic heat-resistant steel is about 2-3 times that of spheroidal graphite cast iron, and higher wear resistance than spheroidal graphite cast iron as a base metal can be obtained. Further, it contains spalling due to crack than the wear in the wear rate of the brick portions as described above, in the case of high toughness large austenitic heat-resistant steel high-temperature strength and excellent in cracking resistance, as a result A longer life stove cooler can be obtained than a conventional brick-cast structure.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

The reason why the long side of the refractory material is set in the height direction of the stave cooler is to increase the deformation resistance due to heat during the operation of the blast furnace. In the base material structure having the ribs 17 continuous only in the width direction as shown in FIG. 10, the resistance to thermal deformation is weak, and particularly the bending in the height direction is weak. As a countermeasure, the deformation resistance of the stave cooler is increased by forming base ribs mainly in the height direction on the long sides of the refractory material .

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

The thermal conductivity of austenitic heat-resistant steel is low among metal materials and about 1/2 that of spheroidal graphite cast iron.
It is about three times that of conventional refractory bricks. Therefore, the same heat insulation performance as firebricks cannot be obtained, but especially in the case of a stove cooler in a high heat load part, as described above, the wear rate of the brick is the life-limiting of the stave cooler body,
In the present invention, emphasis is placed on the superiority of wear resistance and crack resistance of austenitic heat-resistant steel.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction contents]

FIGS. 7 (a) and 7 (b) show a method in which one row of the connected refractory material 10 is placed on the mold 11 as one block. The refractory material 3 set by the steel bar 8 is arranged along the furnace inner shape of the mold 11, and the steel bar 8 connecting the refractory material 3 is fixed to the side wall of the mold 11. Since the steel bar 8 is cast into the base metal as it is,
It serves to promote the retention of the refractory material 2. Further, since the staggered arrangement, each block 10 as shown in FIG. 7 (b), i.e. placed to shift the width of the refractory material one minute to隔列intervals.

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0027

[Correction method] Change

[Correction contents]

In the present invention, a cushioning material such as ceramic felt, which has been conventionally used in the case of refractory bricks, is not applied, and the surface of the refractory material 3 is rusted or stained by shot blasting or the like before being placed in a mold. After removing the like, the surface cast into the base metal, as shown in FIG.
A ceramic coating mold or the like is coated 12 and sufficiently preheated and dried before pouring. The ceramic coating 12 may be applied to the entire surface of the refractory material, but it is also possible to leave the uncoated portion to further enhance the adhesion to the base metal. In this case, for example, as shown in FIG. 8, it is desirable to alternately form a portion having a ceramic coating and a portion not having a ceramic coating to equalize the degree of adhesion between the base metal and the refractory material. Also, the ceramic coating is desirable least 50% of the surface area per refractory material. this is,
And to prevent the deformation caused by thermal expansion difference of the thermal deformation and the base metal and the refractory material of the stave cooler, and this for the application amount of the ceramic coating refractory material 1 over 50% per front surface product.

[Procedure amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction contents]

As the refractory material 3, as shown in FIG.
An austenitic heat-resistant steel sheet having a concave surface 5 on one side may be used. Austenitic heat-resistant steel with one concave surface
The plate is manufactured by casting with a large degree of freedom in shape, for example, SCH
Use 13 heat-resistant cast steel. The method of installation in a mold and the like are the same as in the case of the austenitic heat-resistant steel plate having the above-described flat shape.

[Procedure amendment 13]

[Document name to be amended] Statement

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

1 is a front view of a stave cooler coordinated <br/> location in zigzag so that the austenitic heat-resistant steel sheet (refractory material) long side becomes a height direction in the embodiment of the present invention.

[Procedure amendment 14]

[Document name to be amended] Statement

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

[4] Ru perspective view der refractory material provided with a one-sided concave.

[Procedure amendment 15]

[Document name to be amended] Statement

[Correction target item name] Fig. 8

[Correction method] Change

[Correction contents]

8 is a perspective view showing a state in which a portion without a portion of the ceramic <br/> click coated refractory material is formed alternately of austenitic heat-resistant steels.

[Procedure amendment 16]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Description of Signs] 1: Main body of stove cooler 2: Cooling pipe 3: Refractory material 5: Recess 6: Refractory material provided with through hole 7: Through hole 8: Rod for connecting refractory material 9: Welded part 10: Connected refractory material 11: mold 12: ceramic coating 13: furnace shell 14: a conventional stave coolers 15: refractories 16: cast bricks 17: rib 18: insert casting bricks

[Procedure amendment 17]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

[Procedure amendment 18]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 10

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4K015 CA05 4K051 AA01 AB03 HA01

Claims (5)

[Claims] 1. A rectangular refractory material is formed from austenitic heat-resistant steel, and a plurality of such refractory materials are stood upright at a predetermined angle with the long side being a height direction and are staggered. A stove cooler characterized by being integrally cast on one side of the cooler. 2. The stave cooler according to claim 1, wherein at least one side of the refractory material to be cast is formed with a concave shape. 3. The stove cooler according to claim 1, wherein at least one or more through-holes are provided on a side surface of the refractory material to be cast. 4. The stove cooler according to claim 1, wherein a surface of the refractory material to be cast is coated with a ceramic coating of 50 or more per surface area. 5. A plurality of connected refractory materials formed by disposing a formwork around a stave cooler main body, arranging rectangular refractory materials made of austenitic heat-resistant steel in parallel, and fixing each long side of the refractory material with a connecting rod. Pieces, while standing at a predetermined angle so that the long side of each refractory material is in the height direction, and on the stave body in the form via the connecting rod so as to be staggered in the height direction. A method for manufacturing a stave cooler, comprising disposing a molten metal in a mold, and casting a refractory material.