KR20170024799A - Tundish and Method for casting using the same - Google Patents
Tundish and Method for casting using the same Download PDFInfo
- Publication number
- KR20170024799A KR20170024799A KR1020150120281A KR20150120281A KR20170024799A KR 20170024799 A KR20170024799 A KR 20170024799A KR 1020150120281 A KR1020150120281 A KR 1020150120281A KR 20150120281 A KR20150120281 A KR 20150120281A KR 20170024799 A KR20170024799 A KR 20170024799A
- Authority
- KR
- South Korea
- Prior art keywords
- main body
- slag
- melt
- tundish
- molten steel
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/04—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like tiltable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/06—Equipment for tilting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
- B22D43/005—Removing slag from a molten metal surface
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
The present invention relates to a method for manufacturing a slag, comprising: a main body having a space for containing a melt therein; an opening and closing port formed in a bottom portion of the main body to slide the melted material; And a driving part mounted on the bottom part of the main body so as to selectively tilt the main body to the side of the slag bath, and a casting method using the same, The slag can be easily excluded, and a tundish and casting method capable of improving the casting edge can be provided.
Description
TECHNICAL FIELD The present invention relates to a turn-dish and a casting method using the same, and more particularly, to a turn-dish having improved structure for easily excluding slag during casting and a casting method using the same.
The turn-dish provided in the continuous casting facility is a device that receives molten steel from the ladle and continuously injects it into the mold. The tundish has the function of storing molten steel and slag for a certain period of time, preventing molten steel and slag from flowing out to the outside, maintaining the temperature of the molten steel, lengthening the residence time of molten steel, and helping to separate the nonmetallic inclusions. Such a turn-over has a quadruple structure of the inner side from the outer side to the inner side, the inner side, the inflow material and the coating material. It keeps the structure and shape of the tundish so that it forms the outer wall of the tundish and protects the tundish from the hot molten material by being built inside the tundish. The inflow material and the coating material are provided as a non-metallic refractory material which is not melted in the hot melt, and are injection-molded or coated inside the soft material to prevent erosion by the hot melt.
In order to improve the function of storing the molten steel, which is a main function of the tundish, the thickness of the inflow material and the coating material should be maintained to an appropriate thickness during the tundish of the tundish, but the inflow material and the coating material are gradually eroded by the slag during the tundish There is a problem that it is difficult to maintain the thickness thereof.
In particular, the influent and coating materials are provided as basic refractories, and their erosion rate is inversely related to the basicity of the slag contained in the tundish. Therefore, when the steel containing oxygen is contained in the tundish, the basicity of the slag is lowered, so that the refractory is eluted and the erosion speed is accelerated by the equilibrium reaction.
Conventionally, in order to maintain the thickness of the inflow material and the coating material at an appropriate thickness during the tundish of the tundish, the thickness of the inflow material and the coating material is increased or the refractory material of the slag erosion portion of the tundish is reinforced. However, this method has a problem in that it is less effective than the generation cost.
The present invention provides an improved turn-dish structure to facilitate the discharge of slag during casting.
The present invention provides a casting method capable of easily discharging slag from a turn-off during casting.
A turn-dish according to an embodiment of the present invention includes: a main body having a space in which a melt is contained; An opening formed in a bottom portion of the main body to guide the melt; A slag bath formed on the side wall of the main body at an upper portion of the main body to discharge the slag that is floated on top of the melt and separated; And a driving part mounted on the bottom part of the main body so as to selectively tilt the main body toward the slag bath side.
Wherein an inlet of the slag duct is connected to the inside of the main body through a side wall of the main body at one side edge of the main body and an outlet of the slag duct extends downwardly inclined from an inlet of the slag bath, Can be opened from the outside.
The driving unit may be mounted at a position spaced longitudinally and widthwise from the center of the bottom of the main body.
The driving unit may be elevated in a height direction from a lower side of the main body so as to tilt the main body toward the slag bath side downward with the center axis of the bottom part of the main body being the center.
The tilting angle of the main body may be more than 0 DEG and less than 5 DEG.
A casting method according to an embodiment of the present invention includes: a process of preparing a melt; Injecting the melt into the body of the tundish; Tilting the main body toward the slag bath side of the tundish to discharge the slag that is floated and separated on the melted material; A step of bringing the main body back into place; Injecting the molten material into a mold and drawing the molten material into a cast slab; And a step of cooling the cast steel through a cooling stand.
The process of discharging the slag may include a step of tilting the main body to the side of the slag bath with respect to the width direction and discharging the slag to be floated on the upper side of the melt.
The tilting angle of the main body may be more than 0 DEG and less than 5 DEG.
According to the embodiment of the present invention, it is possible to easily discharge the slag from the tundish during casting. For example, when the continuous casting process is applied to the continuous casting process, the structure is improved so that the tundish storing the molten steel and distributing the molten steel to the mold is inclined at a predetermined angle toward the slag bath, The slag can be easily guided to the slag bath side and discharged from the tundish.
From this, it is possible to suppress the rapid erosion of the refractory of the tundish by the large amount of slag, and the tundishness of the tundish can be further improved to 10 to 20 ladles in the conventional 5 to 6 ladle.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining a casting installation according to an embodiment of the present invention; FIG.
2 is a view for explaining a turn-on according to an embodiment of the present invention;
3 is a view for explaining a cross-sectional structure of a portion AA 'in FIG. 2;
4 is a view for explaining the operation of the turn-off according to the embodiment of the present invention.
5 is a view for explaining a casting method according to an embodiment of the present invention.
Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below, but may be embodied in various forms. It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS The drawings may be exaggerated or enlarged to illustrate embodiments of the invention, wherein like reference numerals refer to like elements throughout.
Hereinafter, embodiments of the present invention will be described by way of example based on continuous casting equipment and continuous casting process of a steel mill, but the embodiments of the present invention can be applied to various equipments and processes for processing various melts.
1 is a schematic view showing a casting facility according to an embodiment of the present invention.
1, a casting installation according to an embodiment of the present invention will be described. The casting facility includes a
The
The
2 is a schematic diagram illustrating a turn-off according to an embodiment of the present invention. Here, FIG. 2 (a) is a schematic view showing a plane of the turn-over, and FIG. 2 (b) is a schematic view showing a cross- 3 is a schematic view showing a partial sectional structure taken along line A-A 'in Fig. 2 (b).
Referring to Figs. 2 and 3, the turn-off according to the embodiment of the present invention will be described. Hereinafter, in describing the embodiment of the present invention, the longitudinal direction may be the transverse direction of FIGS. 2 (a) and 2 (b), and the transverse direction may be the longitudinal direction of FIG. 2 (a). And the height direction may be the longitudinal direction of Fig. 2 (b). This direction definition is for the purpose of describing the present invention, and each of the above-described directions can be variously defined in a manner different from the above in a range equivalent to the above-mentioned meaning of each direction.
The turn-
The
The
The
1 to 3, the remaining constitution of the casting equipment according to the embodiment of the present invention will be described. The
The
The
The
For example, among the inner surfaces of the
The cooling stand serves to cool the casting continuously withdrawn from the
The molten steel M is first cooled in the
On the other hand, the main body of the turn-
At this time, the coating material is provided with a coating material of a basic refractory component such as MgO-SiO 2 system. When the molten steel is, for example, a high-acid steel, the basicity of the slag is relatively low. Therefore, due to the chemical equilibrium reaction between the slag and the coating material, The component may be eluted and the coating may be eroded.
For example, since the solubility of MgO is high and the amount of FeO component and MnO component, which are reducing components, is high, the refractory component of the coating material is eroded and molten by FeO, MnO and the like in the slag.
Therefore, in the embodiment of the present invention, after the molten steel is injected into the turn-
For example, when the slag is modified in the above manner to increase the basicity of the slag from 0.5 to 1.5, the solubility of the MgO component of the slag is lowered and the FeO and MnO components as the reducing components in the slag become smaller, Or inhibited or prevented.
On the other hand, even if the basicity of the slag is controlled by controlling the basicity of the slag in this manner, the amount of the slag accumulated during the continuous playing may increase the erosion of the coating material if the amount exceeds the certain amount.
Therefore, in the embodiment of the present invention, the slag can be effectively removed from the upper portion of the molten steel during the continuous performance by using the
FIG. 4 is a process diagram illustrating the operation of the turn-off according to an embodiment of the present invention, and FIG. 5 is a flowchart illustrating a casting method according to an embodiment of the present invention. At this time, FIG. 4A shows the main body in the home state, and FIG. 4B shows the main body in the state where it is tilted toward the slag bath side.
Hereinafter, a casting method according to an embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG. The casting method includes a process of preparing molten steel, a process of injecting molten steel into the main body of the tundish, a process of slagging the main body to the side of the slag bath to discharge the slag which is floated and separated on the molten steel, And drawing the mixture into a cast slab, and cooling the cast slab by passing the cast slab through the cooling slab.
First, a melt (for example, molten steel) is placed in the ladle (S100). Then, the ladle is moved to the upper side of the tundish, and the shroud nozzle provided at the lower portion of the ladle is opened to inject molten steel into the main body of the tundish (S200). At this time, the turn-
Thereafter, the main body is tilted to the side of the slagging
At this time, the main body is divided into two regions around the central axis in the longitudinal direction of the main body bottom portion, and the side wall portion side where the
In this state, when the molten steel is taken in the main body, the
In this way, the slag floated and separated on the molten steel can be easily overflowed to the
On the other hand, the tilt angle [theta] of the main body of the turn-
When the discharge of the slag is completed, the main body is tilted to the opposite side of the slagging
During the tilting process and the home position process of the main body, or after the win position process of the main body, the molten steel is continuously injected into the casting
According to the embodiment of the present invention, when a predetermined amount of slag is accumulated, the total amount of slag in the tundish can be maintained at an appropriate level by removing the slag during the tandem performance, so that the steel containing oxygen is taken into the tundish and the basicity of the slag is relatively , It is possible to suppress the refractory erosion of the turn-by-slag by the slag. Therefore, it is possible to increase the firing rate of the oxygen-containing steel material, thereby improving the productivity of the process.
It should be noted that the above-described embodiments of the present invention are for the purpose of illustrating the present invention and not for the purpose of limitation of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.
10: Ladle 20: Turndish
23: slag bath diagram 24:
30: immersion nozzle 40: mold
Claims (8)
An opening formed in a bottom portion of the main body to guide the melt;
A slag bath formed on a side wall of the main body at an upper portion of the main body so as to discharge the separated slag that is floated up to the upper portion of the melt; And
And a driving part mounted on the bottom part of the main body so as to selectively tilt the main body toward the slag bath side.
The inlet of the slag bath is connected to the inside of the main body through a side wall of the main body at one side edge of the main body,
Wherein the outlet portion of the slag flow channel extends downwardly from the inlet portion of the slag flow channel and opens at the outside of the main body.
Wherein at least one of the driving portions is mounted at a position spaced longitudinally and widthwise from the center of the bottom of the main body.
Wherein the driving portion is lifted up and down in a height direction from a lower side of the main body so that the main body is tilted downwardly inclined toward the slag bath side with the center axis of the bottom portion of the main body being the center.
The tilt angle of the body is greater than 0 DEG and less than 5 DEG.
Injecting the melt into the body of the tundish;
Tilting the main body toward the slag bath side of the tundish to discharge the slag that is floated and separated on the melted material;
A step of bringing the main body back into place;
Injecting the molten material into a mold and drawing the molten material into a cast slab; And
And cooling the cast steel through a cooling zone.
The process of discharging the slag includes:
And tilting the main body to the side of the slag bath with respect to the width direction to discharge the slag floating on the upper portion of the melt.
Wherein the tilting angle of the main body is more than 0 DEG and less than 5 DEG.
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KR1020150120281A KR101749077B1 (en) | 2015-08-26 | 2015-08-26 | Tundish and Method for casting using the same |
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KR1020150120281A KR101749077B1 (en) | 2015-08-26 | 2015-08-26 | Tundish and Method for casting using the same |
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Citations (1)
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KR20110103150A (en) | 2010-03-12 | 2011-09-20 | (주)인영 | Tundish structure |
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KR20110103150A (en) | 2010-03-12 | 2011-09-20 | (주)인영 | Tundish structure |
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