JPH04113149U - Molten steel pot - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a molten steel ladle that absorbs thermal expansion in the circumferential direction of the shell and reduces deformation of the shell and brick presser metal above the top slag line area. [Structure] Slits 6 are provided in the shell 1 above the top slag line area a of the molten steel ladle at predetermined intervals in a direction perpendicular to the circumferential direction of the shell, and the top plate 2 and brick presser metal 3 are arranged in the axial direction of the molten steel ladle. The molten steel ladle is divided into the above predetermined intervals to absorb thermal expansion in the circumferential direction of the shell to prevent deformation of the molten steel ladle.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a molten steel ladle that receives high-temperature molten steel that has been processed at a steel factory. It is related to.

0002

[Conventional technology]

As shown in Figure 4, the conventional molten steel ladle consists of a side shell 21 and a bottom shell 22. The side shell 21 has a flange 23 on the upper end, and a rib on the flange 23. A ring-shaped one-piece brick retainer 24 is tightened and fixed with bolts 25. difference Furthermore, the side shell 21 is provided with a trunnion shaft 26. Trunnion shaft 26 installation position The upper side shell 21 has a horizontal ring 27, and the bottom shell 22 has a scarf. There is a route 28.

0003 For the lining of the molten steel ladle, the top slag line area a is made of MgO-C brick, which has excellent corrosion resistance. However, the bottom slag line area b is made of alumina or high alumina brick or water. Alumina-based, doxite-based, or chamotte-based bricks are used for part c depending on the location. There is.

0004 The MgO-C bricks used in the top slag line area have good thermal conductivity, so they When receiving molten steel at a temperature 50 to 150°C higher than normal for processing, the top slag line area The shell heats up faster than the lower shell, and the shell circumference increases due to thermal expansion. At the same time, the bricks also expand, causing deformation of the shell above the top slag line area a. promote. For this reason, although the horizontal ring 27 is provided, the flange 23 Since the brick presser metal fitting 24 is a ring-shaped integral piece, it promotes deformation and prevents the top The shell above the slag line area a is deformed into a morning glory shape, causing breakage and detachment of the lining bricks. This will cause a drop. This causes the shell to melt and cause molten steel to flow out. We are increasing the frequency of repairs to shell deformed parts.

[0005]

[Problem that the idea aims to solve]

This invention was made to solve the above problems, and the top slug line A slit is made in the shell above the area to further divide the brick presser metal. absorbs the thermal expansion in the circumferential direction of the shell and expands it from the top slag line area upward. The purpose of the present invention is to provide a molten steel ladle in which the shell and brick presser metal are less deformed.

[0006]

[Means to solve the problem]

In a molten steel ladle, from the top slag line area to the upper shell in the shell circumferential direction. Slits are made at predetermined intervals in the right angle direction, and the brick presser is placed on the molten steel ladle shaft. This is a molten steel ladle that is divided into the above-mentioned predetermined intervals in the core direction.

[0007]

[Effect]

In the molten steel ladle according to the present invention, the upper shell from the top slag line area has a predetermined interval. A slit is made in the direction perpendicular to the circumferential direction of the shell, and the brick presser metal is melted. The steel pot is divided into sections at predetermined intervals in the axial direction, so the slits in the shell and the bricks The division positions of the presser metal parts match. The slits and bricks made in the shell like this By matching the dividing positions of the presser metal, heat can be reduced in the circumferential direction of the slit shell. Greater ability to absorb expansion.

[0008] Therefore, the heat transfer from the MgO-C bricks used in the top slag line area is Thermal expansion in the circumferential direction of the shell due to movement can be absorbed by the slits. this Therefore, the shell circumference does not increase due to thermal expansion, and the top slag line area This prevents the upper shell and bricks from deforming, and prevents the bricks from breaking or falling off. This also prevents molten steel from flowing out.

[0009]

【Example】

An embodiment of the present invention will be described based on the drawings. Figure 1 is an explanatory diagram of the shell structure in the top slug line area, (a) is a front view, and (b) is a cross-sectional view. In the figure, 1 is a shell, and a top plate 2 is attached to the upper end of the shell 1. A brick presser metal fitting 3 is installed below the top plate 2 (above the brickwork). There is. Vertical ribs 4 and fireproof castable reinforcing material are on the top surface of the brick presser metal fitting 3. A stud 5 is fixedly attached to the brick holder 8 for tightly fitting and fixing the brick holder 8 to the metal fitting 3. There is a keyhole-shaped slit in the upper part of shell 1 (above the top slug line area a). A port 6 is provided. In addition, the top plate 2 and the brick presser fitting 3 are made of molten steel. It is divided along the axis of the pot. FIG. 2 shows how the brick presser metal fitting 3 is divided.

0010 Inside the molten steel ladle, the top slag line area a is lined with MgO-C bricks 7. Ru. There is a brick presser metal fitting 3 at the top of the MgO-C brick 7. The hardware 3 prevents the lining brick from rising upward due to thermal expansion. MgO-C The brick holder 3 and top plate 2 on the top of the brick 7 are fireproof castable 8. covered with. In addition, 9 in the figure is a horizontal ring, and 10 is a wall brick. shows.

[0011] Next, the slit 6 provided in the shell 1 and the top plate 2 based on FIG. The effect of dividing the brick presser metal fitting 3 will be explained. The solid line in the figure is The outline of the slit 6 provided in the well 1 before thermal expansion is shown, and the dashed line represents the slit in the thermally expanded state. The outer shape of the lit 6 is shown. The arrows in the figure diagram the thermal expansion and indicate its direction. ing.

0012 Due to the conductive heat from the MgO-C brick, shell 1 moves in the direction of the arrow in the figure (up and down, circumferentially). direction). Thermal expansion in the vertical direction is due to the fact that the top of shell 1 is a free end. Therefore, the thermal expansion can escape to the top, and there is no particular problem, but the thermal expansion in the circumferential direction is Compressive stress is generated in the circumferential direction of the shell, thereby deforming the shell 1. This shell A slit 6 is provided for the purpose of absorbing compressive stress in the circumferential direction. therefore , the gap between the slits 6 before thermal expansion is wide as shown by the solid line in the figure; The gap between the grooves 6 is narrowed due to thermal expansion. The gap between slits 6 is in a state of thermal expansion. If there is not enough clearance even if the shell is I can't do it. The top plate 2 and the brick presser metal fittings 3 are Since it is divided into parts instead of a single piece, the pressure in the circumferential direction of the shell is Can absorb shrinkage stress. Furthermore, the shape of slit 6 is changed to a keyhole 11 shape. By doing so, the slit tip remains intact even during repeated thermal expansion and contraction over a long period of time. It is possible to prevent the occurrence of thermal fatigue cracks.

[0013] Furthermore, we will discuss examples of two types of molten steel ladle with different slit sizes manufactured and put into practical use. I will explain. Table 1 shows two types of slit dimensions.

[0014]

[Table 1]

[0015] The thickness of the shell 1 and top plate 2 is 32 mm in both Examples 1 and 2, and is made of brick press. The thickness of the metal fitting 3 is 25 mm. In addition, the brick presser metal fittings in Example 2 were replaced with steel plates. It is made of heat-resistant cast steel and has a width of 5 mm at the center of the circumferential length, 200 mm from the end surface. A slit with a length of 200 mm was provided. Top plate 2 and brick presser metal fittings 3 It was welded and fixed to shell 1 to match the lit pitch. After shell assembly, shell Bricks are placed inside, and then the top plate 2 and brick fittings 3 are made fireproof. Covered with castable 8.

[0016] When the above two types of molten steel ladle were put into practical use, it was found that the molten steel ladle was The service life of the main body has been extended several times. In other words, the molten steel ladle of Example 1 will last for 5 to 10 years. It was found that the molten steel ladle of Example 2 could be used for 10 to 15 years. Example 2 The extension of the service life of the molten steel ladle is due to the effect of the brick presser made of heat-resistant cast steel. Ru.

[0017] In addition, the inner surface of the shell in the top slug line area, the top plate, and the brick press By coating metal parts with heat-resistant coating such as alumina spraying, corrosion holes in the shell can be prevented. It is possible to prevent accidents and extend the service life of the molten steel ladle body. Also , slits and keyholes with ceramic fibers that can follow the thermal expansion and contraction of the shell. By filling with ivar, etc., the fireproof castables will not fall off during construction. , construction of fireproof castable becomes easier.

[0018]

[Effect of the idea]

In this invention, from the top slag line area of the molten steel ladle to the upper shell in the circumferential direction of the shell, Slits are provided at predetermined intervals in the direction perpendicular to the top plate, and the top plate and brick The metal fittings are divided into the above-mentioned predetermined intervals in the axial direction of the molten steel ladle to reduce thermal expansion in the circumferential direction of the shell. By using this molten steel ladle, which absorbs and prevents the molten steel ladle from deforming. It is possible to prevent the lining bricks from breaking or falling off due to deformation of the molten steel ladle. Therefore, there is no possibility of melting of the shell and leakage of molten steel, reducing the frequency of repair of deformed parts of the shell. , and the service life of the molten steel ladle is significantly improved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the shell structure of the top slug line area.

FIG. 2 is a diagram showing how the brick presser is divided.

FIG. 3 is a conceptual diagram illustrating thermal expansion of a slit portion.

FIG. 4 is an explanatory diagram of a conventional molten steel ladle structure.

[Explanation of symbols]

1...shell, 2...top plate, 3...brick presser, 4...vertical rib, 5...stud, 6...slit, 7...
MgO-C brick, 8...Fireproof castable, 9...Horizontal ring, 10...Wall brick, 11...Keyhole, 21...
Side shell, 22...bottom shell, 23...flange, 24...
Brick presser, 25...Bolt, 26...Trunion shaft, 27
...Horizontal ring, 28...Skirt, a...Top slug line area, b...Bottom slug line area, c...Wall part.

Claims (1)

[Scope of utility model registration request] Claim 1: In a molten steel ladle, slits are provided in the shell above the top slag line area at predetermined intervals in a direction perpendicular to the circumferential direction of the shell, and a brick presser is further divided at the predetermined intervals in the axial direction of the molten steel ladle. A molten steel pot characterized by: