JP2008100248A - Continuously casting tundish, and method of continuous casting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a continuously casting tundish, which can actively separate and remove enclosures by sufficiently uniformly mixing hot molten metal in the tundish, and has a molten metal heating device which requires no large scale facilities, and further to provide a method of continuous casting using the same tundish. <P>SOLUTION: The continuously casting tundish receives the molten metal poured from a ladle 1, and pours the received molten metal into a casting mold for continuous casting. The tundish has a molten metal reservoir 7 at a molten metal receiving portion 9 to which the molten metal is poured from the ladle 1. An induction heating coil 6 is arranged on the outer circumference of the molten metal reservoir 7 so as to surround the molten metal reservoir 7. AC current can be supplied to the induction heating coil 6. The height H from the bottom portion 11 of the molten metal reservoir 7 to its top portion 10 is equal to or larger than the diameter D of the equivalent circle of the molten metal reservoir 7. The method of continuous casting uses the tundish described above. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a continuous casting tundish capable of heating molten metal and a continuous casting method using the same.

  When continuously casting molten metal, the molten metal is once received by the continuous casting tundish from the ladle loaded with molten metal, and the continuous casting tundish is placed through the pouring nozzle disposed at the bottom of the continuous casting tundish. The molten metal received in is poured into a continuous casting mold. By using a tundish for continuous casting, the molten metal flow from the ladle is stabilized, the molten metal is distributed to each of the multiple strands, and nonmetallic inclusions contained in the molten metal are separated and removed. Also plays an important role in the above.

  In a two-strand slab continuous casting machine, immersion nozzles are provided at the bottoms of both ends of a horizontally long tundish, and the molten metal is injected into two sets of continuous casting molds through the immersion nozzles to carry out continuous casting of two strands. In the center of the tundish in the longitudinal direction, the tundish receives the molten metal from the ladle at the hot water receiving portion at the intermediate position between the two sets of immersion nozzles. A long nozzle is disposed below the molten metal inlet provided at the bottom of the ladle, and molten metal is injected from the molten metal inlet while preventing the molten metal from being oxidized. Due to the increasing demand for high quality, the tundish capacity has been increased, and the capacity has been increased to 60 to 70 tons of molten steel in the steel slab continuous casting machine.

  In order to reduce the center segregation of the cast slab and maintain good quality, it is preferable that the temperature of the molten metal injected into the continuous casting mold is as low as possible and injected at a temperature close to the solidification temperature. Therefore, it is important to maintain the molten metal temperature in the tundish at a certain level. This is because a temperature close to the solidification temperature is originally targeted, so that when the molten metal temperature fluctuates and becomes lower than the target temperature, a casting problem occurs immediately. However, since the amount of molten metal in the tundish is reduced at the beginning and end of casting and at the time of changing the ladle, there is a problem that the molten metal temperature decreases.

  In order to keep the temperature of the molten metal in the tundish constant, a technique for heating the molten metal in the tundish was developed and used in earnest.

  Non-Patent Document 1 describes a plasma heating method for molten metal in a tundish. Plasma heating is used for large tundish because the shape in the tundish is not complicated and it is possible to increase the output of 3 to 5 MW.

  Plasma heating has the necessary heating capacity, but because it is heated from the surface of the hot water in the tundish, the molten metal with a reduced specific gravity accumulates on the upper surface, and the low temperature molten metal passes through the bottom. Will occur. With this, the molten metal in the tundish cannot be heated uniformly. In order to avoid this phenomenon, it is necessary to gas stir the molten metal in the tundish or to provide a weir to stir the heating section. However, stirring the molten metal surface leads to reentry of the non-metallic inclusions that have floated into the molten metal, which is inefficient from the viewpoint of molten metal cleaning. Further, plasma heating uses a water-cooled consumable electrode, and its life is about several tens to 100 hours, and there is a problem that costs are increased.

  As an induction heating method for the molten tundish, Non-Patent Document 2 describes a groove heating method. A dam is provided between the injection part from the tundish ladle and the injection part to the mold, and two molten metal flow paths are opened in the molten metal immersion part of the dam. Next, a part of the B-shaped iron core is embedded in the dam, and this iron core surrounds one of the two molten metal flow paths. A primary coil is wound around the portion of the iron core exposed from the dam, and an alternating current is passed through the primary coil. The two molten metal flow paths and the molten metal pools on both sides thereof form a one-turn secondary coil, and an induced current flows through the molten metal, whereby the molten metal can be heated.

  The grooved induction heating method has a problem that the tundish refractory structure becomes complicated. Moreover, although the output is limited to about 1.5 MW, it can be used for a small tundish, but a high throughput continuous casting machine has insufficient heating capability. Furthermore, in principle, it is necessary to use a pipe-shaped channel having a diameter of 10 to 20 cm as a molten metal channel opened to the dam, and the non-metallic inclusions are formed on the wall surface of the channel due to the reaction of the pinch force acting on the molten metal during heating. Therefore, there is a problem that the flow path is clogged with the adhering non-metallic inclusions. For this reason, it is unsuitable for the heating method of the continuous casting machine which implements continuous casting for a long time.

  The tundish heater for continuous casting described in Patent Document 1 has an opening on the side surface of the tundish and has a crucible-shaped heat generation chamber communicating with the opening. This heat generating chamber is formed inside the heating coil. The molten metal stored in the tundish is induction-heated by a heating coil in a heat generating chamber and stirred and convected to heat and heat the entire molten metal. However, only heating the molten metal in the heat generating chamber provided on the side of the tundish has a problem that the flow efficiency of the molten metal is poor and it is difficult to uniformly heat the molten metal in the tundish.

  The tundish induction heating device described in Patent Document 2 is a heating coil that separates a tundish into a hot water receiving room block and a hot water supply room block, connects an inductor block having a communication port between the blocks, and winds the communication port And iron core. All the molten metal injected into the hot water receiving chamber is heated by induction heating in the process of passing through the communication port in the inductor block and reaches the hot water supply chamber, so that reliable heat deposition and good heating uniformity are obtained.

  Non-Patent Document 3 describes an induction heating melting furnace. It is described that when an induction coil is wound around a crucible and an alternating current is applied to the induction coil, the metal in the crucible can be heated and at the same time the molten metal in the crucible is agitated.

Japanese Utility Model Laid-Open No. 1-139953 Japanese Patent Laid-Open No. 7-236951 Edited by the Japan Iron and Steel Institute, 129, 130th Nishiyama Memorial Technology Course “Material Processing Using Electromagnetic Force”, April 28, 1992, p. 247 Japan Iron and Steel Institute Joint Study Group, 107th Steelmaking Subcommittee, Steel 107-O (1992) Japan Iron and Steel Institute, 3rd edition Steel Handbook II Steelmaking and Steelmaking, page 562

  Regarding the tundish induction heating device described in Patent Document 2, in order to induction-heat the molten metal passing through the communication port connecting the tundish hot water receiving room block and the hot water supply room block, the groove type induction described in Non-Patent Document 2 is used. Similar to heating, there is a problem that the non-metallic inclusions adhere to the wall surface of the communication port due to the reaction of the pinch force acting on the molten metal passing through the communication port, and the communication port is clogged. Moreover, in the tundish in which the immersion nozzles for a plurality of strands and the hot water receiving part from the ladle are arranged in a horizontal line like the tundish of the slab continuous casting apparatus, the hot water receiving as described in Patent Document 2 If it is going to arrange | position a room block and a hot-water supply room block, it will be necessary to arrange | position a hot-water supply room block and a heating apparatus for every strand, and it must be an extremely large apparatus.

  The present invention eliminates the problem that uniform heating of the molten metal is difficult due to an overheating phenomenon such as plasma heating, and non-metallic inclusions in the molten metal flow path as in groove-type induction heating or induction heating described in Patent Document 2. The problem of clogging due to adhesion is solved, the heated molten metal is sufficiently uniformly mixed in the tundish, and inclusion separation and removal can be actively performed, and the molten metal heating does not require large-scale equipment It aims at providing the tundish for continuous casting which has an apparatus, and the continuous casting method using the same.

That is, the gist of the present invention is as follows.
(1) A continuous casting tundish that receives molten metal injected from the ladle 1 and injects the received molten metal into a continuous casting mold. An induction heating coil 6 is provided on the outer periphery of the molten metal reservoir 7 so as to surround the molten metal reservoir 7, and an alternating current can be passed through the induction heating coil 6, so that the molten metal reservoir 7 The continuous casting tundish characterized in that the height H from the bottom 11 to the top 10 is equal to or greater than the equivalent circle diameter D of the molten metal reservoir 7.
(2) The continuous casting tundish according to (1) above, wherein the top portion 10 of the molten metal reservoir portion 7 is located at a position higher than the tundish bottom portion 12 at a portion where the molten metal is poured into the continuous casting mold.
(3) A continuous casting method, wherein the molten metal is continuously cast using the tundish for continuous casting described in (1) or (2) above.

  The tundish 3 for continuous casting according to the present invention has a molten metal reservoir portion 7 whose outer periphery is surrounded by the induction heating coil 6 in the hot water receiving portion 9 that receives the molten metal from the ladle, so that an alternating current flows through the induction heating coil 6. Thus, the molten metal accumulated in the molten metal reservoir 7 can be induction-heated. Since the molten metal reservoir portion 7 for heating the molten metal is disposed in the hot water receiving portion 9 from the ladle, it is not necessary to dispose a heating device for each strand even in a continuous casting tundish having a plurality of strands. Since the molten metal injection flow 23 from the ladle passes through the molten metal reservoir 7 and flows into the tundish, the heated molten metal is uniformly mixed in the tundish. In the molten metal pool portion, the aggregation of non-metallic inclusions and the floating separation effect accompanying induction stirring are promoted. By the reaction of the pinch force, non-metallic inclusions can be positively adsorbed on the side wall of the molten metal reservoir, and a further cleaning action can be obtained. Since the inner diameter of the molten metal reservoir can be increased, unlike the groove-type heating device or the induction heating device described in Patent Document 2, inclusions are not clogged with the inclusion in the molten metal flow path of the heating section, and the flow path is not closed. By making the height H from the bottom to the top of the molten metal reservoir equal to or greater than the equivalent circle diameter D of the molten metal reservoir, the stirring flow in the molten metal reservoir can be contained in the molten metal reservoir, and tundish hot water. Occurrence of inclusion re-entrainment due to surface disturbance can be prevented.

  The present invention will be described with reference to FIGS.

  The continuous casting tundish 3 of the present invention receives the molten metal poured from the ladle 1 in the hot water receiving portion 9 and injects the received molten metal into the continuous casting mold. In the two-strand continuous slab casting apparatus, immersion nozzles 4 are provided at the bottoms of both ends of the horizontally long tundish 3, and molten metal is injected into two sets of continuous casting molds through the immersion nozzle 4 to perform continuous casting of two strands. . In the hot water receiving portion 9 at the center of the tundish 3 in the longitudinal direction and between the two sets of immersion nozzles, the tundish receives the molten metal from the ladle 1 via the long nozzle 2.

  The molten metal reservoir portion 7 of the present invention is disposed in a hot water receiving portion 9 into which molten metal is poured from a ladle. The molten metal reservoir portion 7 is disposed downward in the tundish 3. The molten metal injected from the ladle 1 through the long nozzle 2 forms an injection flow 23 as shown in FIG. 4 and is supplied into the tundish via the molten metal reservoir 7. The side surface of the molten metal reservoir 7 is surrounded by a side wall 13, and the induction heating coil 6 is disposed outside the side wall 13 so as to surround the molten metal reservoir 7. The shape of the molten metal reservoir 7 is preferably a cylindrical shape with a closed bottom.

  As shown in FIG.3 (c), it is good also as opening the bottom part in the hot water receiving part 9 of a tundish, and forming the molten metal pool part 7 in the downward direction. The induction heating coil 6 can be easily disposed on the outer periphery of the cylindrical molten metal reservoir 7. However, during continuous casting, there is a cast floor in which a continuous casting mold is disposed below the tundish. Since the clearance between the lower end of the tundish and the continuous casting mold is not large, as shown in FIG. 3C, if the molten metal reservoir 7 is provided as it is at the bottom of the tundish 3, the bottom of the tundish and the continuous casting mold are provided. Often does not fit in the clearance.

  In the present invention, as shown in FIG. 2, it is preferable that the top portion 10 of the molten metal reservoir portion 7 is located at a position higher than the tundish bottom portion 12 in the portion where the molten metal is poured into the continuous casting mold. Thereby, the protrusion amount of the molten metal reservoir 7 directed downward from the tundish bottom 12 can be reduced. In this case, since it is necessary to arrange the induction heating coil 6 on the outer periphery of the molten metal reservoir 7 so as to surround the molten metal reservoir 7, a notch 8 is provided along the outer periphery of the molten metal reservoir 7 at the bottom of the tundish. It is preferable to provide the induction heating coil 6 including the cut portion 8.

  When an alternating current is applied to the induction heating coil 6, an induction current flows through the molten metal in the molten metal reservoir, and the molten metal in the molten metal reservoir can be heated. In addition, when a low frequency is used as an alternating current, a pinch force from the periphery of the molten metal pool portion toward the center acts on the molten metal in the molten metal pool portion, and the molten metal can be agitated. As shown in FIG. 4, the stirring flow 22 generated in the molten metal reservoir 7 generates a flow from the side wall 13 of the molten metal reservoir toward the center in the vicinity of the axial center of the induction heating coil 6. Near the center of the molten metal reservoir, the flow is divided into an upward flow and a downward flow, and both the upward flow and the downward flow form a closed flow path. Generation of such a molten metal flow promotes uniform mixing of the molten metal heated in the molten metal reservoir.

  The alternating current applied to the induction heating coil 6 may have a frequency of 30 to 1000 Hz. When the frequency is too low, the stirring becomes strong, but the heating efficiency is lowered. If the frequency is too high, the efficiency of both stirring and heating decreases. If it is the range of 30-1000 Hz, it is possible to satisfy both stirring and a heating. About 300 Hz is preferable.

  As a reaction, the pinch force acting on the molten metal near the molten metal reservoir side wall 13 exerts a force that moves the nonmetallic inclusions in the molten metal toward the molten metal reservoir side wall 13. As a result, a phenomenon occurs in which nonmetallic inclusions in the molten metal in the molten metal pool accumulate and adhere to the side wall of the molten metal pool 7. Due to this phenomenon, the non-metallic inclusions in the molten metal are separated and removed in the molten metal reservoir, and a great effect of cleaning is exhibited.

  Since the molten metal reservoir 7 can have a sufficiently large diameter D, continuous casting can be continued for a necessary time even if non-metallic inclusions accumulate on the side wall 13 of the molten metal reservoir.

  Since the molten metal reservoir portion 7 is disposed in the hot water receiving portion 9 into which molten metal is injected from the ladle, the molten metal injected as the injection flow 23 from the ladle is first conveyed into the molten metal reservoir portion by the downward inertial force. It is. That is, the molten metal supplied into the tundish is first conveyed into the molten metal reservoir. The ratio of the molten metal injected into the continuous casting mold without passing through the molten metal reservoir 7 is small. Then, the molten metal is heated in the molten metal reservoir 7 and at the same time the nonmetallic inclusions are separated and removed, sequentially discharged from the molten metal reservoir, moved through the tundish, and finally injected into the continuous casting mold through the immersion nozzle 4. Is done.

  On the other hand, the tundish heater for continuous casting described in Patent Document 1 has an opening on the side surface of the tundish and has a crucible-type heat generating chamber communicating with the opening. This heat generating chamber is formed inside the heating coil. Unlike the present invention, since the molten metal injected into the tundish is not necessarily introduced into the heat generating chamber, the ratio of the molten metal injected into the mold without passing through the heat generating chamber is estimated to be high. Since the molten metal injected into the mold without passing through the heat generating chamber has no opportunity to separate and remove non-metallic inclusions in the heat generating chamber, the inclusions cannot be sufficiently removed as in the present invention. Moreover, since the convection of the molten metal in the tundish and the heat generating chamber uses only the thermal convection as the driving force, the molten metal heated in the heat generating chamber accumulates in the upper part of the molten metal in the tundish, Since the unheated molten metal flows, the substantial thermal efficiency is reduced as compared with the present invention. If an attempt is made to replace the melt in the tundish with the heat generated in the heat generating chamber by the induced stirring force in the heat generating chamber, the tundish water surface will be disturbed by the stirring force, which in turn increases the contamination of the melt in the tundish. It will be.

  As described above, the molten metal in the molten metal reservoir is agitated by the induced current. When this stirring motion reaches the molten metal above the top 10 of the molten metal reservoir 7, the molten metal surface 21 in the tundish is disturbed. The molten metal surface 21 is covered with non-metallic inclusions floating and separated, and a flux for protecting the molten metal surface. Therefore, the molten metal surface is disturbed, and the non-metallic inclusions and flux on the molten metal surface 21 are mixed into the molten metal. Then, the cleanliness of the molten metal is impaired. If the height H from the bottom 11 to the top 10 of the molten metal reservoir 7 is too low compared to the internal cross-sectional area of the molten metal reservoir 7, the molten metal stirring flow 22 in the molten metal reservoir will exceed the top 10 of the molten metal reservoir. There is a possibility of disturbing the tundish water surface.

  In the present invention, the height H from the bottom portion 11 to the top portion 10 of the molten metal reservoir portion 7 is equal to or greater than the equivalent circle diameter D of the molten metal reservoir portion, so that the molten metal stirring in the molten metal reservoir portion is performed in the molten metal reservoir portion. It can be confined only to. The equivalent circle diameter means the diameter of a circle having the same area as the cross-sectional area of the horizontal section of the hot water pool. As a result, in the molten metal reservoir, the molten metal is sufficiently agitated to uniformly mix the heated molten metal, and non-metallic inclusions can be adhered to and separated from the molten metal reservoir side wall 13 and the molten metal surface 21 in the tundish. Therefore, it is possible to maintain high cleanliness of the molten metal without causing disturbance. In the present invention, since the top portion 10 of the molten metal reservoir 7 can be disposed at a certain depth from the tundish molten metal surface, the influence of stirring in the molten metal reservoir on the molten metal surface can be further reduced. .

  The preferred size of the molten metal reservoir 7 is such that the capacity of the molten metal reservoir 7 is about 10% to 15% of the tundish capacity in a normal tundish of 60 tons. The inner diameter of the molten metal reservoir is preferably about 1 to 1.2 m and the height H is preferably about 1 to 1.2 m.

  In the present invention, in order to ensure the height H of the molten metal reservoir portion 7, a protruding portion 15 may be provided at the top portion 10 of the molten metal reservoir portion 7 as shown in FIG.

  The present invention can further provide various types of weirs in the tundish. In the example shown in FIG. 3B, a slit weir 16 and an outer weir 17 are provided.

  When the use of one tundish is completed in continuous casting and the tundish is replaced with another tundish, the remaining amount of molten metal in the tundish is reduced as much as possible to replace the tundish. This is because the molten metal remaining in the tundish causes a yield loss. When the tundish bottom portion has a molten metal reservoir as in the present invention, the molten metal in the molten metal reservoir cannot be poured into the mold, and this molten metal remains in the tundish, causing yield loss. . Conventionally, the idea of providing a molten metal reservoir for induction heating at the bottom of the tundish has not been born. However, as in the present invention, by providing the molten metal pool portion at the bottom of the tundish of the hot water receiving portion from the ladle and performing induction heating, sufficient large capacity heating can be uniformly performed even in a large continuous casting machine. It has been clarified that a great effect of separating and removing non-metallic inclusions can be exhibited, and that a conventional continuous casting machine can be installed without significant modification.

  The continuous casting method of the present invention is characterized in that the molten metal is continuously cast using the above-described continuous casting tundish of the present invention. Accordingly, the present invention can ensure a sufficient heating capacity and perform uniform heating even in high-capacity high-speed continuous casting. For this reason, the temperature of the molten metal poured into the casting mold for continuous casting can be kept constant, so that casting can be completed without causing any casting trouble even in low temperature casting with a low molten metal superheat. It is possible to produce a slab of good quality with little center segregation. Moreover, since inclusions can be separated and removed in the molten metal reservoir, a slab of good quality with few inclusions can be manufactured.

  The present invention was applied in a two-strand continuous slab caster for casting steel. The amount of molten steel in the ladle is 300 tons, and the casting speed is 10 tons / min in total for both strands. The tundish 3 shown in FIGS. The tundish 3 has a capacity of about 60 tons, a tundish shape having a length of 7 m, an upper end width of 1.3 m, a lower end width of 0.7 m, and a depth of 1.3 m from the molten metal surface 21 to the tundish bottom 12. An immersion nozzle 4 is disposed at the bottom of both ends of the tundish 3.

  A cylindrical molten metal reservoir portion 7 having an inner diameter of 1 m was provided in a hot water receiving portion 9 into which molten steel was poured from the ladle via the long nozzle 2. The distance from the molten metal surface to the bottom 11 of the molten metal reservoir is set to 1.5 m, and the height H from the bottom 11 to the top 10 of the molten metal reservoir 7 is changed in the range of 0.9 to 1.2 m, and four types of tongues are changed. Dish was built. A cut portion 8 was provided along the outer periphery of the molten metal reservoir 7 at the bottom of the tundish, and the induction heating coil 6 was wound around the outer periphery of the molten metal reservoir 7 including the cut portion 8. The induction heating input was 3 MW (1.5 MW / strand). As a comparative example, a tundish having no molten metal reservoir was also used.

  Nonmetallic inclusions contained in molten steel are classified into alumina and slag. An alumina system is an alumina inclusion generated by deoxidation. The slag system is an inclusion that is generated by the smelting process and is generated by the slag floating in the ladle or the upper part of the tundish because the specific gravity is about 3 and light against molten steel. -A composite oxide such as alumina.

  The molten steel temperature was measured at two locations of the hot water receiving portion 9 and the immersion nozzle 4 installation portion in the tundish, and the temperature difference between them was taken as the molten steel temperature difference. In addition, 500 g of molten steel sample is collected from the tundish at two locations, the hot water receiving part 9 and the submerged nozzle 4 installation part in the tundish, and the electrolytic extraction method (the steel sample is electrolyzed in the electrolytic solution to obtain non-metallic inclusions The inclusions were analyzed by an inclusion evaluation method in which only the sample was extracted and classified after filtering. From non-metallic inclusions observed in the sample, amorphous alumina inclusions with a diameter of 50 μm or more, and slag inclusions that are spherical and easy to distinguish because they are liquid in molten steel, mainly calcia alumina. And the abundance of each was quantified. The ratio of the amount of inclusions in the sample collected at the hot water receiving part to the amount of inclusions in the sample collected at the immersion nozzle installation part was taken as the inclusion reduction rate. The reason why inclusions with a diameter of 50 μm or more were used is because inclusions of this size cause internal defects in the steel material.

  The results are shown in Table 1.

  Compared to Comparative Example 1 which does not have a molten metal reservoir and does not perform induction heating, the levels of induction heating in the molten metal reservoir are all small in the molten steel temperature difference, and at the same time, the heating effect is obtained. The system inclusion reduction rate is good, and the inclusion removal effect is clear. Focusing on the slag inclusion reduction rate, Comparative Example 2 in which the height H of the molten metal reservoir is less than the diameter D swallows the slag floating on the tundish hot water surface, and the reduction rate of the slag inclusions is compared. Although the results are worse than Example 1, the examples of the present invention in which the height H of the molten steel pool portion is equal to or greater than the diameter D are all in contrast to Comparative Example 1 in the slag inclusion reduction rate. It is clear that there is an improvement.

It is a perspective fragmentary sectional view which shows the tundish for continuous casting of this invention. It is a figure which shows the tundish for continuous casting of this invention, (a) is a top view, (b) is BB arrow sectional drawing, (c) is CC arrow sectional drawing, (d) is D It is -D arrow sectional drawing. It is sectional drawing which shows the tundish for continuous casting of this invention. It is a fragmentary sectional view which shows the condition of the stirring flow generated in the molten metal pool part of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ladle 2 Long nozzle 3 Tundish 4 Immersion nozzle 6 Heating coil 7 Molten pool part 8 Notch part 9 Hot water receiving part 10 Top part 11 Bottom part 12 Tundish bottom part 13 Side wall 15 Protrusion part 16 Slit weir 17 Outer weir 21 Hot water surface 22 Stir flow 23 Injection flow

Claims (3)

A continuous casting tundish that receives molten metal injected from a ladle and injects the received molten metal into a continuous casting mold,
The hot water receiving portion into which the molten metal is poured from the ladle has a molten metal reservoir portion, and an induction heating coil is disposed around the molten metal reservoir portion so as to surround the molten metal reservoir portion. A continuous casting tundish characterized in that an electric current can flow and the height from the bottom to the top of the molten metal reservoir is equal to or greater than the equivalent circle diameter of the molten metal reservoir.   2. The tundish for continuous casting according to claim 1, wherein a top portion of the molten metal reservoir portion is located at a position higher than a tundish bottom portion at a portion where the molten metal is poured into a continuous casting mold.   A continuous casting method, wherein the molten metal is continuously cast using the tundish for continuous casting according to claim 1.

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