Entitled Replacing the submerged nozzle
Technical field
[0001]
　The present invention relates to method of exchanging the immersion nozzle used in continuous casting of steel.
Background technique
[0002]
　Immersion nozzle for discharging the molten steel from the tundish into the mold in the continuous casting of steel is used. Immersion nozzle, upper nozzle, sliding nozzle plate, or it is used by connecting to the refractory at the top of such lower nozzle, in particular a submerged nozzle for wear and the like of molten steel, to replace only the immersion nozzle during continuous casting methods are known.
[0003]
　The exchange method is a method for exchanging a new immersion nozzle used in the spent (old) new submerged nozzle with extruding the immersion nozzle can be performed while immersing the immersion nozzle in the mold during continuous casting. Then, a method of exchanging the immersion nozzle during continuous casting Thus, in order to minimize leakage of molten steel in the exchange, the immersion nozzle of both submerged nozzle new immersion nozzle and spent, the upper nozzle a method of exchanging while sliding in a state of being pressed from below against the sliding nozzle plate or an upper portion of the refractory, such as the lower nozzle, is, for example, disclosed in Patent Document 1.
[0004]
　As shown in FIG. 10 is a replacement method of Patent Document 1, and biased upward by the keyboard rows 51 disposed flange portion 53 of the immersion nozzle 52 spent (in use) on both sides, of the upper nozzle 56 holds in a state of being pressed against the joint surface 54, when exchanging an immersion nozzle 52 is replaced with the immersion nozzle 52 spent by extruding a new immersion nozzle 52a laterally pusher 58 coupled to the cylinder 57. At this time the new immersion nozzle 52a is to slide while being pressed against the joint surface 54 of the upper nozzle 56, it can be exchanged instantly immersion nozzle without leaking molten steel even during continuous casting.
[0005]
　However, this replacement process, the upper nozzle and the immersion nozzle are crimped joint surfaces of refractories, localized wear during replacement, and the like surface accuracy variation at the time of thermal expansion and manufacturing in use there is generation of a gap between the bonding surfaces. When the gap occurs, or decrease the quality of the steel by suction of air from the gap, there is also a risk of leakage of molten steel through the gap.
[0006]
　On the other hand, if not carrying out such a replacement method, the immersion nozzle and the upper nozzle, it is common to join via a shaped joint material in order to ensure sufficient sealing performance. The shaped joint member is a sheet-like refractory having plasticity with a notch of little more than or equal to the nozzle hole and the nozzle hole of the immersion nozzle used large size, when the submerged nozzle is pressed on the nozzle it is deformed by filling the gap (Patent documents 2-6). Shaped joint material, some of which have a plasticity over a wide temperature range from room temperature to hot.
[0007]
　However, the exchange method of Patent Document 1, because the new immersion nozzle which slides while being pressed against the upper nozzle, even when placed shaped joint member on the upper surface of the new immersion nozzle, the shaped joint material by the upper nozzle to or or or off are scraped off, it was not possible to use the shaped joint member.
[0008]
　Therefore, replacing the submerged nozzle is disclosed in Patent Document 7 can use the shaped joint member. In this exchange method of Patent Document 7, the new immersion nozzle by moving under the upper nozzle while keeping the lower surface and fixed space above the nozzle, the shaped grouting moving the immersion nozzle is placed on the upper surface of the new submerged nozzle is held on the upper surface of the immersion nozzle remains installed state without contacting the upper nozzle.
[0009]
　However, in this Patent Document 7 exchange method, lowering the sealing performance becomes due to space occurs, a new molten steel on the upper surface of the immersion nozzle to fall bonding surface foreign material between the new immersion nozzle and the upper nozzle during the exchange There's a problem. Incidentally, during the exchange is to stop the flow of molten steel with a stopper or the like falling down the molten steel remaining in the nozzle hole.
CITATION
Patent Document
[0010]
Patent Document 1: JP Registered Utility Model No. 3009112
Patent Document 2: JP-B 60-15592 Patent Publication
Patent Document 3: Japanese Patent No. 2977883 discloses
Patent Document 4: JP 2001-286995 Patent Publication
Patent Document 5: JP 2009- 227538 JP
Patent Document 6: JP-a 7-330448 Patent Publication
Patent Document 7: WO 2002/094476
Summary of the Invention
Problems that the Invention is to Solve
[0011]
　An object of the present invention is to provide, in exchange method of the immersion nozzle performed while extruding the immersion nozzle of spent new immersion nozzle, with minimal leakage of the molten steel in the exchange, the use of shaped joint member to the junction surface to allow is to ensure high sealing property.
Means for Solving the Problems
[0012]
　The present inventors, the concave portion is provided to include a nozzle hole (inner hole) on the top surface of the new immersion nozzle, by mounting the fixed form joint material in the recess, the lower surface of the upper surface of the upper portion of the refractory of the new immersion nozzle to be slid while pressing, without or be scraped off or shift shaped joint member was found that to be crimped between the bonding surfaces. Further, a protrusion on the upper surface of the new submerged nozzle provided, by locking the shaped joint member to the protrusion, likewise without or shaped joint material is scraped off or deviation, is crimped between the bonding surfaces It was finding the Rukoto.
[0013]
　That is, according to the present invention, replacing the submerged nozzle in the following (1) (6) is provided.
　(1) The new immersion nozzle, by sliding while pressed against the lower surface of the flange of the lower surface is supported by a pressing member provided in parallel on both sides and the top of the refractory, the used immersion nozzle a method of exchanging the immersion nozzle extruded horizontally crimped joined to refractory top,
　a concave portion is provided to include a nozzle hole to the upper surface of the new immersion nozzle, the mounting the shaped joint member in the recess replacing of the immersion nozzle, characterized.
　(2) The new immersion nozzle, by sliding while pressed against the lower surface of the flange of the lower surface is supported by a pressing member provided in parallel on both sides and the top of the refractory, the used immersion nozzle a method of exchanging the immersion nozzle extruded horizontally crimped joined to refractory top,
　a projection provided on the side opposite to the insertion side of the immersion nozzle in the upper surface of the new immersion nozzle, the protrusion height replacing of the immersion nozzle, characterized in that the fixed form joint member of a larger thickness, arranged to lock on the projections.
　(3) new recess formed on the upper surface of the immersion nozzle exchanging method of the immersion nozzle according to are open (1) to the side of the insertion side of the immersion nozzle.
　(4) refractory top, replacing the submerged nozzle according to any of the new to the lower end portion of the insertion side of the immersion nozzle having an inclined surface (1) (3).
　(5) shaped joint material, replacing the submerged nozzle according to any of the new on the insertion side of the immersion nozzle having an inclined surface (1) (4).
　(6) shaped joint material, replacing the immersion nozzle according to any one of having expandable (1) (5).
[0014]
　Note that the shaped joint member in the present invention, slightly larger shape than or equal nozzle hole and the nozzle hole of the immersion nozzle, i.e. plate-shaped refractory having a plastic having a notch having a shape corresponding to the nozzle hole of the immersion nozzle things in, but that can be filled with deformed by a gap when the immersion nozzle is joined to the refractory of the upper.
Effect of the invention
[0015]
　According to method of exchanging the immersion nozzle of the present invention, also be slid while pressing the upper surface of the new submerged nozzle to the lower surface of the upper portion of the refractory, has never or be scraped off or shift shaped joint member. Therefore, it is possible to use a shaped joint material to the upper surface of the new submerged nozzle (bonding surface). Minimum Moreover, since sliding while pressing the upper surface of the new immersion nozzle with a shaped joint material to the lower surface of the upper portion of the refractory, it is possible to ensure a high sealing property even during the exchange, the leakage of the molten steel in the exchange it can be.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016]
FIG 1a] is a diagram conceptually illustrating a method of replacing the immersion nozzle according to the first embodiment of the present invention.
[Figure 1b] Ibid.
[Figure 1c] Ibid.
[Figure 1d] Ibid.
It is a longitudinal sectional view of the upper nozzle used in the first embodiment of FIG. 2a] present invention.
Is a bottom view of the upper nozzle used in the first embodiment of FIG. 2b] present invention.
Is a bottom view of the immersion nozzle used in the first embodiment of FIG. 3a] present invention.
Is a top view of the immersion nozzle used in the first embodiment of FIG. 3b] the present invention.
4 is a plan view of the immersion nozzle used in the first embodiment of the present invention.
It is a longitudinal sectional view of the immersion nozzle used in the second embodiment of FIG. 5a] present invention.
Is a top view of the immersion nozzle used in the second embodiment of FIG. 5b] present invention.
6 is a plan view of a shaped joint material used in the second embodiment of the present invention.
It is a longitudinal sectional view of the upper nozzle to be used in the third embodiment of FIG. 7a] present invention.
Is a bottom view of the upper nozzle to be used in the third embodiment of FIG. 7b] present invention.
It is an explanatory view showing a fourth embodiment of FIG. 8a] present invention.
Is a top view of the immersion nozzle to be used in the fourth embodiment of FIG. 8b] present invention.
It is an explanatory view showing a fifth embodiment of FIG. 9a] present invention.
Is a top view of the immersion nozzle to be used in the fifth embodiment of FIG. 9b] the present invention.
FIG. 10 is an explanatory diagram showing a method of replacing a conventional immersion nozzle disclosed in Patent Document 1.
DESCRIPTION OF THE INVENTION
[0017]
(First Embodiment)
　FIG. 1d Figures 1a is a diagram conceptually illustrating a method of replacing the immersion nozzle according to the first embodiment of the present invention.
[0018]
　The new immersion nozzle 10 (hereinafter, simply referred to as "submerged nozzle 10".) In FIG. 1d Figures 1a is supported the flange lower surface 16 on the keyboard 4 as a pressing member provided in parallel on both sides, and It pressed against the lower surface 21 of the upper nozzle as an upper refractory while sliding. Sliding mechanism for sliding the pressing mechanism and the immersion nozzle 10 by the keyboard 4 has the same mechanism as the aforementioned Patent Document 1 (FIG. 10). Specifically, keyboard 4 for pressing the both sides of the flange lower surface 16 of the immersion nozzle 10 is positioned four on one side, when moving the immersion nozzle 10 is pushed in the arrow direction by a drive device (not shown) , the top surface 14 slides while being pressed by the keyboard 4 to the lower surface 21 of the upper nozzle. The pressing force at this time is 600kgf. Incidentally, the old submerged nozzle of spent (in use) in Fig. 1d Figures 1a are omitted. However, consists Figure 1a because there is no old submerged nozzle in the same state as FIG. 1d when first connected to the immersion nozzle to the upper nozzle, it is possible to apply the present invention even in this case.
[0019]
　Nozzle 20 for using in the present embodiment, as shown in FIG. 2a (longitudinal sectional view) and FIG. 2b (bottom view), the flange portion of the lower body portion is substantially cylindrical and the octagonal central and a nozzle hole 22. Dimension A1 of the lower surface 21 of the upper nozzle is 240 mm, the dimension B1 is 220 mm, the nozzle hole diameter of the lower surface 21 of the upper nozzle is 77 mm.
[0020]
　Immersion nozzle 10 used in this embodiment, as shown in FIG. 3a (longitudinal sectional view) and Fig. 3b (top view), the flange portion 12 of the upper body portion 11 is cylindrical has a quadrangular prism, and a nozzle hole 13 at the center. Top 14 one side of the immersion nozzle has a square 190 mm, the nozzle hole diameter of the upper surface 14 is 80 mm. The vertical A2 to contain a nozzle hole 13 on the upper surface 14 of the immersion nozzle is 170 mm, the lateral B2 is 150 mm, has a recess 15 of 3mm depth.
[0021]
　The recess 15 of the upper surface of the immersion nozzle is shaped joint member 30 having a circular cut-out portion (inner hole) 31 rectangular in plan view as shown in FIG. 4 is mounted, the shaped joint member 30 is vertically A3 There 165mm, horizontal B3 is 140 mm, notch diameter (Uchiana径) is 90 mm, the thickness is 3.5 mm.
[0022]
　The shaped joint member 30 is manufactured in the same manner as Patent Document 5. Specifically, the sintered alumina 50 wt%, the main raw material consisting of Fused Mullite 20 wt%, 10 wt% clay, frit 10 wt%, 1 wt% flake graphite to the raw material powder blended as an auxiliary raw material, acrylic system emulsion (binder) 25 wt%, texanol was added to (plasticizer) 1 wt% in outer percentage, by kneading using a tabletop mixer and dried at about 80 ° C. and pressed into a sheet shape to prepare a fixed form joint material 30. In addition, the shaped joint member 30, those which are commonly used for sealing between the immersion nozzle and the upper nozzle can be used, such as those disclosed by Patent Document 2 to Patent Document 6 There can be used.
[0023]
　Next, specifically described how to replace the immersion nozzle according to the present embodiment.
[0024]
　In FIG. 1a, the immersion nozzle 10 when moves to the left, first rides flange lower surface 16 of the immersion nozzle in the keyboard 4, the lower surface 21 of the upper nozzle upper surface 14 of the immersion nozzle is in a state of contact with Figure 1b Become. Go further sandwiched in contact with the insertion end 32 is the lower surface of the upper nozzle 21 of the shaped joint member 30 when moved to the left, shaped joint member 30 and the lower surface of the upper nozzle 21 will be slid in contact to 1c become of the state. In this case, shaped joint member 30 is a deviation is prevented by the side face of the recess 15, can the upper nozzle 20 rides over the shaped joint member 30. Shaped joint member 30, by moving the lower surface 21 of the upper nozzle while being pressurized, a state of the inserted diagram 1d between the upper nozzle 20 and the immersion nozzle 10. In this case, the fixed form joint material 30 is contracted about 0.3mm.
[0025]
　Thus, according to the method of replacing the immersing nozzle according to the present embodiment, even if sliding while pressing the upper surface 14 of the immersion nozzle to the lower surface 21 of the upper nozzle, the shaped joint member 30 is or are scraped off or deviation there is no. Therefore, it is possible to use the shaped joint member 30, and since the shaped joint member 30 is compressed between the joint surface between the immersion nozzle 10 on the nozzle 20, to eliminate the gap between the upper nozzle 20 and the immersion nozzle 10 it can. The recess 15 of the upper surface of the immersion nozzle to contain the nozzle holes 13, shaped joint member 30 can move while contacting the upper nozzle 20 at near the nozzle hole 13. Therefore, since the molten steel from the top nozzle 20 from falling on the shaped joint member 30 also has fallen into the immersion nozzle exchange, the upper surface of the shaped joint member 30 the molten steel is pushed into the shaped joint member 30 is smooth it is possible to prevent the occurrence of gaps for. These makes it possible to ensure even during exchange high sealing property, it is possible to minimize the leakage of the molten steel in the exchange.
[0026]
　Further, as described above, in this embodiment, shaped joint member 30 to initially contact the lower surface 21 of the upper nozzle, sandwiched securely between the shaped joint member 30 and the lower surface 21 of the upper nozzle and the condition 14 of the immersion nozzle be able to. That is, when the thickness of the shaped joint member 30 as in this embodiment is greater than the depth of the recess 15, shaped joint member 30 is first contacted with the lower surface 21 of the upper nozzle on the insertion side end portion 32 during the immersion nozzle insert it is preferable to dispose the possible positions. However, when contacted with the first in the lower surface 21 of the upper nozzle without its side unlike the present embodiment also, it shaped joint member 30 and is easily be Yawaraku cut, the insertion-side end (corner) squashed It will be sandwiched in order to or a little cut or been.
[0027]
　On the other hand, when the thickness of the shaped joint member is less than or equal to the depth of the recess, the insertion-side end portion of the shaped joint member may be any position. In this case, the shaped joint member does not contact with the lower surface of the upper nozzle while exchanging the immersion nozzle, as described above in the immersion nozzle exchanging, since sliding while pressing the upper surface 14 of the immersion nozzle to the lower surface 21 of the upper nozzle, sealing of no practical problem can be secured. Further, since the molten steel from the upper nozzle 20 in the immersion nozzle exchange is dropped onto the shaped joint member in the recess also been dropped, the upper surface of the shaped joint fillers molten steel as described above is pushed into the shaped joint fillers smooth becomes because it is possible to prevent the occurrence of gaps, the leakage of the molten steel in the exchange can also be minimized.
[0028]
　Thus, especially if the thickness of the shaped joint member is less than or equal to the depth of the recess, it is preferable to use a shaped joint member having expandable. Since the immersion nozzle is preheated in air prior to replacement, the thickness of the preheating (heating) or preheating (heating) in shaped joint member at the time of the exchange by the use of inflatable shaped joint member to be expanded by oxidation of increased, thereby improving the sealing properties. The use of shaped joint member having expandable preferably also from the viewpoint of improving the sealing properties after replacement, it is also effective when the thickness of the shaped joint member is larger than the depth of the recess.
[0029]
　As a form of shaped joint member having an expandable, shaped joint material comprising a thermally expandable fire particles. The heat-expandable fire particles, thermally expandable graphite particles, thermally expandable vermiculite particles, thermally expandable obsidian particles, thermally expandable pitchstone particles, thermally expandable perlite particles, thermally expandable clay particles, thermally expandable shale particles and the like, can be used as a mixture of at least these at least one or two. The shaped joint material comprising a thermally expandable fire particles, to improve the sealing properties by heat-expanding fire particles are expanded by heating by use of after preheating or replacement before the replacement.
[0030]
　Other forms of shaped joint member having an expandable, Al, Mg, Cu, shaped joint material containing low-melting metals Zn and the like. The shaped joint material containing low-melting metal, to improve the sealing property by volumetric expansion and oxidized by heating by use of after preheating or replacement before the low melting point metal exchange.
[0031]
Second Embodiment
　longitudinal sectional view of the immersion nozzle Figure 5a used in the second embodiment of the present invention, FIG. 5b is a top view thereof. In the present embodiment, it is provided as in the immersion nozzle of the first embodiment shown in FIGS. 3a and 3b, to open the recess 15 of the upper surface in the immersion nozzle insertion side surface 17. Specifically, the recess 15 in the present embodiment, the vertical A4 is 165mm, horizontal B4 is 140 mm, a depth is 3 mm. Furthermore, shaped joint member 30 to be attached to the recess 15, the vertical A5 is 160mm as shown in FIG. 6, the horizontal B5 is 130 mm, the thickness was 3.5 mm, it can be placed up to the immersion nozzle insertion side surface 17 size It is set to.
[0032]
　In this embodiment, the same method as in the first embodiment shown in FIG. 1d from FIG. 1a, that is, when moved to the lower side of the upper nozzle 20 of the immersion nozzle 10 by the drive device, the immersion nozzle 10 flange lower surface thereof 16 can be sandwiched between the upper and pressed against while sliding on the lower surface 21 side of the nozzle, the immersion nozzle 10 and the upper nozzle 20 and shaped joint member 30 by the keyboard 4. In other words, shaped joint member 30 in the present embodiment, since the three sides displacement is prevented by the three sides of the recess 15 provided in the upper surface 14 of the immersion nozzle, or be scraped off or off the shaped joint member 30 without are crimped between the bonding surfaces.
[0033]
　Furthermore, in this embodiment, since the shaped joint member 30 is disposed to the immersion nozzle insertion side surface 17, also have some falling molten steel from the nozzle holes of the upper nozzle in the immersion nozzle exchanging reliably in shaped joint member since pushed in, it is possible to prevent the occurrence of a gap junction. Therefore, it is possible to secure high sealability, the leakage of the molten steel in the exchange can also be minimized.
[0034]
Third Embodiment
　longitudinal sectional view of the nozzle on Figure 7a used in the third embodiment of the present invention, FIG. 5b is a bottom view thereof. In the present embodiment, the nozzle on the first embodiment shown in FIGS. 2a and 2b, is provided with the inclined surface 23 of the R30mm the lower end of the immersion nozzle insertion side. By thus providing the inclined surface 23, and more reliably suppress the deviation in the immersion nozzle exchanging shaped joint member 30, moreover it is possible to form a smooth joint surfaces without irregularities.
[0035]
　Inclined surfaces provided on the lower end of the immersion nozzle insertion side of the upper nozzle is a vertical sectional shape thereof may be straight or curved. The inclination angle of the inclined surface, the angle formed between the lower surface of the extended surface of the inclined surface and the upper nozzle is preferably in the range of 70 degrees from 10 degrees. Further, when the vertical sectional shape of the inclined surfaces of the curve, for example, can range R from 5mm to 50 mm.
[0036]
(Fourth Embodiment)
　FIG. 8a is an explanatory view showing a fourth embodiment of the present invention, FIG. 8b is a submerged nozzle top view used in Figure 8a. In the present embodiment, it is provided with a protrusion 18 instead of the recess formed in the immersion nozzle of the first embodiment shown in FIGS. 3a and 3b. That is provided opposite smaller height than the thickness of the shaped joint member 30 on the side protruding portion 18 and the insertion side of the immersion nozzle in the upper surface 14 of the immersion nozzle. Protrusion 18 in particular are those which height is 1 mm, a width of 3 mm, a length provided by bonding with an adhesive a 120mm steel plate on the upper surface 14 of the immersion nozzle.
[0037]
　On the other hand, shaped joint member 30, the vertical A6 is 170mm in FIG 8b, the lateral B6 is 140 mm, notch diameter (Uchiana径) is 90 mm, the thickness is 3.5 mm. That is, in this embodiment, the projections 18 provided on the side opposite to the insertion side of the immersion nozzle 10 in the upper surface 14 of the immersion nozzle, engaging the shaped joint member 30 of thickness greater than the height of the protrusion 18 on the protruding portion 18 It is arranged so as to be stopped.
[0038]
　In this embodiment, the same method as in the first embodiment shown in FIG. 1d from FIG. 1a, that is, when moved to the lower side of the upper nozzle 20 of the immersion nozzle 10 by the drive device, the immersion nozzle 10 flange lower surface thereof 16 can be sandwiched between the upper and pressed against while sliding on the lower surface 21 side of the nozzle, the immersion nozzle 10 and the upper nozzle 20 and shaped joint member 30 by the keyboard 4. In other words, it shaped joint member 30 in the present embodiment, since displacement is prevented by engaging the protrusion 18, without or be scraped off or off the shaped joint member 30 is crimped between the bonding surfaces. Further, since the height of the protrusion 18 is smaller than the thickness of the fixed joint member 30, the protrusion 18 nor hinder the sliding in the immersion nozzle exchanging.
[0039]
　Here, the Ikan'naku to exhibit the sealing property due shaped joint member 30 in the present embodiment, it is preferable that the protruding portion 18 having flexibility. Incidentally, the protrusion 18 of the present embodiment has flexibility since the iron plate.
[0040]
(Fifth Embodiment)
　FIG. 9a is an explanatory view showing a fifth embodiment of the present invention, FIG. 9b is a submerged nozzle top view used in Figure 9a. In the present embodiment, after so as to lock the shaped joint member 30 in the same manner protrusion 18 in the fourth embodiment, it is further provided an inclined surface 33 on the insertion side of the shaped joint member 30. The inclined surface 33 is a longitudinal cross-sectional shape thereof may be straight or curved. The inclination angle of the inclined surface, the angle formed between the extension surface of the upper surface of the inclined surface and shaped joint member is preferably in a range of 70 degrees from 10 degrees. Further, when the vertical sectional shape of the inclined surfaces of the curve, for example, can range R from 5mm to 50 mm. The outer dimensions of the shaped joint member 30 in the present embodiment, the vertical A7 is 165mm, horizontal B7 is 140 mm, notch diameter (Uchiana径) is 90 mm, a thickness of 3.5 mm.
[0041]
　In this embodiment, the same method as in the first embodiment shown in FIG. 1d from FIG. 1a, that is, when moved to the lower side of the upper nozzle 20 of the immersion nozzle 10 by the drive device, the immersion nozzle 10 flange lower surface thereof 16 can be sandwiched between the upper and pressed against while sliding on the lower surface 21 side of the nozzle, the immersion nozzle 10 and the upper nozzle 20 and shaped joint member 30 by the keyboard 4. Moreover, since the shaped joint member 30 has an inclined surface 33, it is possible to sandwich the fixed form joint member 30 more reliably between the upper nozzle 20 and the immersion nozzle 10.
[0042]
　The above first to fifth embodiments, although the refractory of the upper connecting the immersion nozzle 10 is the case of the upper nozzle 20, when the refractory of the upper is other than the upper nozzle, for example, sliding nozzle plate Ya If the lower nozzle is also, of course, equally applicable exchange method of the immersion nozzle of the present invention.
[0043]
　The pressing mechanism and sliding mechanism of the immersion nozzle is also not limited to the embodiment. In short, the new immersion nozzle, by sliding while being pressed against the flange lower surface to the lower surface of both sides to be supported by a pressing member provided in parallel and the upper portion of the refractory, horizontal spent immersion nozzle it may be a mechanism to be crimped joined to refractory of the upper extruded direction.
Example
[0044]
　The results of the exchange test of the immersion nozzle under various conditions shown in Table 1.
[0045]
[Table 1]

[0046]
　In Table 1, Example 9 from Example 1, in the method of exchanging the immersion nozzle shown in FIG. 1d from FIG. 1a, the upper nozzle shown in FIGS. 2a and 2b, the immersion nozzle shown in Figures 3a and 3b and that the depth of the recess is different in an embodiment of the present invention using thick, those made of different materials or consistency with shaped joint member shown in FIG. On the other hand, Comparative Example 1 is an example only placing the shaped joint member without providing a recess in the immersion nozzle. Test, except Example 9 carried out at room temperature, Example 9 was used immersion nozzle which is heated at 1000 ° C..
[0047]
　Measurements of the thickness of the shaped joint member is performed after replacing the previous exchange, after the replacement, at a position where the central axis of the immersion nozzle and the central axis of the nozzle hole of the upper nozzle is matched immersion nozzle is moved, the upper nozzle of the lower only measured shaped joint material was performed by calculating the average value in each of the central portion in the eight sides.
[0048]
　Surface state of the shaped joint material, after removal of the immersion nozzle, to observe the state of the shaped joint member, good those without voids and what voids and defects.
[0049]
　Example 1 Example 3 from is an example of using different immersion nozzle of the depth of the recess, both shaped joint material is uniformly filled between the immersion nozzle and the upper nozzle to contract about 10% removal after also gaps or voids on the surface of being favorably adhered without.
[0050]
　Although Example 4 is an example of thickness using a thick shaped joint material compared to 5mm and other examples, was at a level no practical problem though slightly uneven were observed on the surface after removal.
[0051]
　EXAMPLE 5 If the pressing force of the immersion nozzle is 400 kgf, Example 6 the pressing force of the immersion nozzle is a case of 800 kgf, both shaped joint material could be filled without problems.
[0052]
　The material of the shaped joint material used (KJC-A) in Example 6 from Example 1 above, as shown in the first embodiment, a sintered alumina 50 wt%, Fused mullite 20 wt% the main raw material, 10 wt% clay, frit 10 wt%, the raw material powder blended with 1 wt% flake graphite as an auxiliary raw material, acrylic emulsion (binder) 25 wt%, texanol (plasticizer) outside the 1 wt% it is obtained by adding in over.
[0053]
　Example 7, said KJC-A the amount of coupling agent to increase 5 mass% which was softer is an example of using the (KJC-B), shaped joint material filling without problems It could be.
[0054]
　Example 8, the KJC-A that the addition amount of the binder was hardened by reducing 5 wt% with respect is an example of using the (KJC-C), shaped joint material be filled without problems did it.
[0055]
　Example 9 immersion nozzle the use in KJC-A using 2 wt% thermally expandable graphite in place of flake graphite 1% by weight obtained by applying expandable to (KJC-D), prior to further exchange the examples were heated at 1000 ° C., but shaped joint material could be filled without problems.
[0056]
　On the other hand, Comparative Example 1 is an example not provided a recess in the immersion nozzle was poor also observed gaps or voids on the surface after removal.
[0057]
　Under the conditions of Example 3 corresponding to the first embodiment described above, the replacement was performed during the actual continuous casting. In the method of Patent Document 1 and Patent Document 7 described above while the leakage of the molten steel in the exchange has been seen, the leakage of the molten steel in the exchange in the process of the present invention was observed.
DESCRIPTION OF SYMBOLS
[0058]
　10 immersion nozzle
　11 body portion
　12 the flange portion
　13 nozzle hole (inner
　hole) 14 top surface of the immersion nozzle
　15 recess
　16 flange lower surface
　17 submerged nozzle insertion side surface
　18 protrusions
　20 on the nozzle
　21 the lower surface of the upper nozzle
　22 nozzle holes
　23 inclined surface
　30 shaped joint member
　31 notch (inner
　hole) 32 insertion-side end portion
　33 inclined surface
　4 keyboard (pressing member)
The scope of the claims
[Claim 1]
　The new immersion nozzle, by sliding while pressed against the lower surface of the flange lower surface is supported by a pressing member provided in parallel on both sides and the top of the refractory, the used immersion nozzle horizontally extruded a method of exchanging the immersion nozzle for compression bonding the refractory of the upper,
　the recess to include a nozzle hole to the upper surface of the new submerged nozzle provided, and wherein the attaching the shaped joint member in the recess how to replace the immersion nozzle.
[Claim 2]
　The new immersion nozzle, by sliding while pressed against the lower surface of the flange lower surface is supported by a pressing member provided in parallel on both sides and the top of the refractory, the used immersion nozzle horizontally extruded a method of exchanging the immersion nozzle for compression bonding the refractory of the upper,
　the protruding portion is provided on the side opposite to the insertion side of the immersion nozzle in the upper surface of the new submerged nozzle greater thickness than the height of the protrusion replacing of the immersion nozzle, characterized in that the arrangement of the shaped joint member, to lock on the projections.
[Claim 3]
　New recess formed on the upper surface of the immersion nozzle exchanging method of the immersion nozzle according to claim 1 which is open to the side surface of the insertion side of the immersion nozzle.
[Claim 4]
　Refractory top, replacing the immersion nozzle according to any one of claims 1 to 3 having an inclined surface on the lower end portion of the insertion side of the new submerged nozzle.
[Claim 5]
　Shaped joint material, replacing the immersion nozzle according to any one of claims 1 to 4 having an inclined surface on the insertion side of the new submerged nozzle.
[Claim 6]
　Shaped joint material, replacing the immersion nozzle according to claim 1, claim 5 having expandable.