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WO1997004901A1 - Entree limitee de gaz dans un moule a coulee en continu - Google Patents

Entree limitee de gaz dans un moule a coulee en continu Download PDF

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Publication number
WO1997004901A1
WO1997004901A1 PCT/US1996/011471 US9611471W WO9704901A1 WO 1997004901 A1 WO1997004901 A1 WO 1997004901A1 US 9611471 W US9611471 W US 9611471W WO 9704901 A1 WO9704901 A1 WO 9704901A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
channel
molten metal
channels
inert gas
Prior art date
Application number
PCT/US1996/011471
Other languages
English (en)
Inventor
Achilles Vassilicos
Original Assignee
Usx Engineers And Consultants, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/508,216 external-priority patent/US5527281A/en
Priority claimed from US08/589,392 external-priority patent/US5670075A/en
Application filed by Usx Engineers And Consultants, Inc. filed Critical Usx Engineers And Consultants, Inc.
Priority to JP9507604A priority Critical patent/JPH11510098A/ja
Priority to MX9800657A priority patent/MX9800657A/es
Priority to GB9721382A priority patent/GB2314038B/en
Priority to DE19681448T priority patent/DE19681448T1/de
Publication of WO1997004901A1 publication Critical patent/WO1997004901A1/fr

Links

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
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/42—Features relating to gas injection
    • 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
    • B22D41/50—Pouring-nozzles
    • B22D41/502—Connection arrangements; Sealing means therefor
    • 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
    • B22D41/50—Pouring-nozzles
    • B22D41/58—Pouring-nozzles with gas injecting means

Definitions

  • This invention relates to valves used in the continuous casting of metal, especially steel.
  • it relates to delivery systems for inert gas to the mating surfaces of sliding gate valves and stopper rod flow control valves or systems to effect a seal by generating a positive pressure of gas between the mating surfaces to inhibit the entry of ambient gases such as air which could degrade the quality of the metal being cast and to help minimize the entry of molten metal to the interface.
  • the invention involves the use of a porous refractory insert in a channel around or partially around the valve opening, occupying only part of the channel so that the gas can be evenly distributed in the circumferential recess behind (upstream from) the porous refractory.
  • the porous refractory insert evenly distributes the flow of inert gas between the contacting surfaces which are moved in contact with each other such as the contacting surfaces of the slide plate and the tube holder and/or the slide plate and the top plate, the tube holder and the nozzle, and other similar interfaced surfaces which slide or move with respect to each other.
  • a similar construction is used for the prevention of the ingress of air and other gases such as sealing gas into contact with molten metal at the top of a pouring tube where it is fixed to a tube holder.
  • the invention is useful in any substantially flat interface, made by parts movable or stationary, which form a conduit for liquid metal near the input of a continuous caster.
  • molten metal is poured from a ladle or tundish through a valve, commonly a slide valve, through a refractory nozzle and into the tube which is partially immersed in the incipient continuous ingot in order to insulate the molten steel from air and other gases.
  • the tube is fixed to a tube holder, which contacts the under side of a slide valve.
  • the present invention addresses the control of the ingress of undesirable gases (the aspiration of air) through the joint between the tube and the tube holder, and also through the substantially flat interfaces of the slide valves.
  • Sliding gate valves and stopper-rod valves with on-line pouring tube change capability have been found to be quite practical and are widely used.
  • the joint between the tube holder and the tube itself was commonly simply mortared.
  • a circumferential steel shroud or shell frequently is used to cover the joint, but such a shell is generally more effective for strengthening the structure than for providing a gas seal.
  • a primary problem caused by air is the oxidation of aluminum present in the steel. The formation of alumina at this stage of steel production is highly undesirable.
  • Russo in US Patent 5,100,034, purports to improve upon Fehling by inserting porous refractory in a similar channel. But Russo feeds his gas to one portion only of the refractory, thus requiring the gas to pass through the refractory before entering an open space leading to the fissures to be sealed. This configuration leads to considerable variation in gas pressure in different areas of the unit; also the refractory cannot physically block the spillage of molten metal into the channel.
  • the present invention employs a particular assembly for feeding inert gas into the joint between the mating faces of the tube and tube holder.
  • I employ a circumferential channel in which a porous refractory element is placed without occupying the entire depth of the channel, thus providing a circumferential feed passage for the introduction of gas at a more or less equal pressure contacting the porous refractory throughout the channel.
  • Inert sealing gas is fed from outside the shroud, through the tube holder wall, preferably in response to a signal representing the difference in pressure between the circumferential feed passage and the outside ambient pressure. The inert sealing gas is thus able to displace air which may find its way into the joint.
  • a preferred joint is designed to provide a mortar shelf on the interior surface of the tube and a complementary overhang on the interior surface of the tube holder; the shelf and overhang are maintained approximately one to six millimeters apart when the remaining flat surfaces of the joint are placed together, thus providing room for a circumferentially mortared area.
  • the tube is cut circumferentially at an upward angle so the mortar will tend not to be spilled into the remainder of the joint; to further assure that it will not, I employ a relief groove at the high end of the circumferential upward angled cut.
  • the purpose of the relief groove in the mortared variation of my invention is to minimize the possibility of mortar and/or steel finding its way into the main joint.
  • my preferred assembly requires that the flat portions of the mating joint surfaces be ground flat, i.e. within a tolerance of .00125cm to .03cm — that is, the surface preferably should not vary more than about .03 cm throughout its area. Should the circumferential porous refractory project beyond the flat surface of the joint, it should also be ground to effect flush, firm contact around the circumference of the main portion of the joint.
  • my invention is seen to comprise a circumferential porous refractory placed on the tube holder joint surface, spaced from the interior wall of the tube holder and its exterior wall, and being in contact with a gas feed channel throughout its circumference.
  • the gas feed channel is in turn connected to a source of inert gas, preferably fed in response to a signal which is a function of the difference between the ambient outside pressure and the pressure at the internal wall of the tube and/or the circumferential gas feed passage.
  • My invention includes an apparatus and method for feeding inert gas into the interface of movable member and stationary members of a gate valve such as used to control the pouring of molten steel into a continuous caster.
  • the movable member is the tube holder or submerged nozzle and the stationary member is the tundish nozzle or an intermediate plate, depending on the particular construction.
  • a preferred form of the invention involves the use of a channel, preferably generally U- shaped, in the surface of the slide, and another channel, also preferably generally U-shaped, in the mating surface of at least one of the stationary portions of the valve.
  • Each of the channels is partially filled with a porous refractory insert, in such a way that the outer surface of the refractory is level with the respective mating surface, leaving an unoccupied area of the channel deeper into the slide or stationary portion, so that an open area or passage is provided over the entire internal surface of the porous refractory insert.
  • This open area or passage in the channel is connected to a duct for a source of inert gas, which is then provided at pressures which are equal over the entire internal surface of the porous refractory insert.
  • open channels are provided in position so that, when they are juxtaposed, gas can pass freely from one to the other.
  • Figure la is a side elevational view of the upper region of a typical prior art commercial continuous caster for steel, showing the placement of the commonly used slide gate valve.
  • Figures 2, 3, 4, 5, and 6 are directed to this type of valve.
  • Figures lb and lc show prior art stopper rod arrangements to which my invention is also applicable.
  • Figure 2 is a simplified side sectional view of a slide gate valve, showing the top plate, the slide plate, and the tube holder, together with a preferred configuration of my gas delivery system.
  • Figure 3a is a simplified overhead view of the upper surface of the tube holder, showing only the features of the upper surface.
  • Figure 3b is a simplified view of the under side of the slide plate, showing only the surface features. This under side of the slide plate will slide on the tube holder surface of Figure 3a.
  • Figures 3c, 3d, and 3e show the relationship of the features of Figures 3a and 3b as the slide plate is moved leftward into the "fully closed” or “entry” position (3c) , the "throttle” or working position (3d) , and the “exit” position (3e) .
  • Figure 4a is a simplified overhead view of the top plate, showing only the features on the under side.
  • Figure 4b is a simplified overhead view of the top of the slide plate, showing only the features relevant to the top surface.
  • Figures 4c, 4d, and 4e show the relationship of the features of Figures 4a and 4b as the slide plate is moved leftward underneath the top plate into the "fully closed” or “entry” position (4c) , the “throttle” or working position (4d) , and the “exit” position (4e) .
  • Figures 5 and 6 show variation of the slide plate incorporating my invention.
  • Figure 7a is an enlarged (compared to Figure l) side sectional view of a typical prior art joint between a pour tube and tube holder.
  • Figure 7b is a more highly, enlarged detail of another prior art variation of the joint showing mortar on the outside of the tube.
  • Figure 8a is a side sectional view of a pour tube and tube holder joint of my invention, showing the circumferential porous refractory, and the circumferential gas feed passage.
  • Figure 8b illustrates the sealed fit of the porous refractory in the circumferential channel.
  • Figure 9a is side sectional view of a different embodiment of my invention, which includes a mortar shelf and a mortar relief groove.
  • Figure 9b shows the preferred extremity of the mortar placement in the joint.
  • Figure 10 illustrates that my invention may be used with no mortar in the joint.
  • this more or less conventional assembly includes a tundish 2 having a refractory lining 1 containing liquid steel 3 for forming into a continuous slab.
  • Control of the flow of steel through refractory nozzle 4 (which is secured by well block 20) is by a sliding gate valve comprising top plate 5 and slide plate 6 as is known in the art.
  • Top plate 5 may be secured to mounting plate 51.
  • tube holder 7 Directly beneath the slide plate 6 is tube holder 7 and fixed directly beneath it is pour tube 8.
  • pour tube 8 passes directly through slag layer 9 on the top of the incipient slab 11, which is formed from molten steel 10 deposited near the top of the incipient slab 11 while being exposed to as little atmosphere as possible.
  • Water-cooled copper mold 12 solidifies the steel sufficiently so that by the time it exits mold 12 at its bottom, it has formed a hard shell 13 strong enough to contain the still molten steel 10 in its center. Copper mold 12 is reinforced by a steel envelope 14 around it. The rate of passage of molten steel 3 through the slide plate 6 is controlled so as to simultaneously (1) prevent an overflow of mold 12 (2) maintain a constant molten metal level and (3) keep up with the solidification and production rates of the slab 11.
  • Figure lb illustrates a variation of the prior art to which the present invention is also applicable.
  • the submerged entry nozzle 47 passes through slag layer 9 as in Figure la, but there is no slide plate 6 ( Figure la) ; rather, flow of metal is stopped by the insertion, by manipulator 45, of stopper 44 into refractory nozzle 4.
  • Refractory nozzle 4 may be surrounded by mortar 54.
  • Submerged entry nozzle 47 may then be replaced by moving it horizontally, maintaining contact with fixed plate 46 at interface 48, which retains molten metal in passage 52.
  • a new submerged entry nozzle 47 follows horizontally, also maintaining contact with fixed plate 46 at interface 48.
  • Tube holder 53 may be replaced in a manner similar to the replacement of submerged entry nozzle 47 in Figure lb —that is, it is moved horizontally, keeping it in contact with nozzle/top plate 50 at interface 49 while stopper 44 halts the flow of metal.
  • the upper surface of tube holder 53 can be comparable to the upper surface of slide plate 6 as illustrated in Figures 4a-4e and the under surface of nozzle/top plate 50; both may be equipped with a gas delivery system exactly as described in Figures 4a-4e.
  • top plate 5 is seen to have an orifice 15 and a gas delivery channel 16, the lower part of which is filled with a porous refractory 17, leaving a passage 18 connecting with a gas duct 19 which is in turn connected to a source of inert gas, not shown, under pressure.
  • Slide plate 6 has an orifice 31 and gas delivery channels 21 and 22 similar to gas delivery channel 16, also only partly filled with refractory shapes 23 and 24, forming passages 25 and 26.
  • the top of tube holder 7 also has a gas delivery channel 27 partly filled with refractory 28 and forming a passage 29. Passage 29 is connected to gas supply duct 30 in a manner similar to that of passage 18 and duct 19 on the top plate 5.
  • gas introduction through ducts 19 and 30 is contemplated in this embodiment only in the stationary parts, the top plate 5 and the tube holder 7.
  • gas introduction should only take place through a stationary part; rather, one may envision, for example, through the use of flexible tubing and the like, that the introduction could be in the slide plate 6, as is illustrated in Figure 6.
  • the porous refractory I use for the channel insert may be any of the porous refractories known in the art, such as porous zirconia refractories or high-alumina porous refractory. In practice typically varying from one-quarter inch thick to three quarters inch thick, they should preferably provide no more than about 2 psi pressure drop (and in any event no more than about 4 psi pressure drop) when a standard inert gas such as argon is flowing through the insert at about 35 standard cubic feet per hour.
  • the refractory may be formed in place in the channel or prefabricated and set into the channel with a sealant suitable for the conditions of pressure, temperature and wear; such sealants are known in the art.
  • Figure 3a is a simplified overhead view of the top surface of tube holder 7, defining an orifice 32 within refractory insert 34 and showing gas delivery channel 27 and gas transfer channel 35.
  • Gas delivery channel 27 may be seen to be generally U-shaped, as is preferred.
  • Refractory 28, seen in Figure 2 partially filling gas delivery channel 27, is not illustrated in Figure 3.
  • Duct 30 connects gas transfer channel 35 and gas delivery channel 27, and receives gas from an outside source not shown.
  • the slide plate 6 in Figure 3b is viewed from above in a simplified manner showing only features directly relevant to its lower surface which will interface with tube holder 7.
  • Slide plate 6 has gas transfer channel 36 and gas delivery channel 22 on its lower surface.
  • Gas transfer channel 36 is connected to gas delivery channel 22 by duct 33.
  • the dimensions of gas transfer channel 36 coordinate with the dimensions of gas transfer channel 35 on tube holder 7 ( Figure 3a) so a connection may be made to pass gas originating in duct 33 ( Figure 3a) and passed into gas transfer channel 35 of tube holder 7 to gas transfer channel 36 of slide plate 6. This is illustrated further in Figures 3c,
  • Figure 3c the features of Figure 3b have been juxtaposed on those of Figure 3a to illustrate the relative positions of gas delivery channel 27 and gas transfer 35 of tube holder 7 with respect to gas delivery channel 22 and gas transfer channel 36 of slide plate 6.
  • Figure 3c is the first of the series 3c, 3d, and 3e showing the typical movement of the slide plate 6 over tube holder 7. The slide plate 6 moves from right to left, as depicted. When it reaches the "entry" or “fully closed” position of Figure 3c, meaning there is not yet an overlap of orifice 31 and orifice 32, the gas transfer channels 35 and 36 have begun to overlap, permitting inert gas to travel from duct 30 through gas transfer channels
  • gas transfer channels 35 and 36 are somewhat removed from orifices 31 and 32. This is preferred because gas transfer channels 35 and 36 do not contain porous refractory inserts as do gas delivery channels 22 and 27; placement as far as practical from the molten metal is recommended to minimize the incidence of metal deposition. In addition, the gas transfer channels are linearly aligned with the sliding direction of the mating surfaces. This preferred form of interface further minimizes the possibility of deposition in these channels.
  • Figure 3d shows the slide plate 6 having moved further to the left on tube holder 7 than shown in Figure 3c, e.g. to the "throttle" position, or a position for normal or typical operation in which orifices 31 and 32 are overlapping but not concentric.
  • gas transfer channels 35 and 36 there is more of an overlap of gas transfer channels 35 and 36 than was seen in Figure 3c.
  • gas flow will be maintained at a high rate in this position to overcome the negative gas pressure induced by the flow of metal through orifices 31 and 32.
  • FIG. 4a a simplified overhead view shows the top plate 5 having a generally U-shaped gas delivery channel 16 in its lower surface around orifice 15.
  • Gas delivery channel 16 is connected to gas transfer channel 37 through duct 40.
  • Gas delivery channel 16 is fed with inert gas from duct 39 from an outside source not shown. As with the gas delivery channels
  • the porous refractory inserts (illustrated in Figure 2 - see refractory inserts 17, 23, 24, and 28) are present but not illustrated in Figure 4 for the sake of simplicity.
  • the gas flows from duct 39 into passage 18 of gas delivery channel 16 (which contains refractory insert 17 — see Figure 2) and thence through duct 40 to gas transfer channel 37, which does not contain porous refractory.
  • the top surface of slide plate 6 is illustrated in Figure 4b, showing gas delivery channel 21 connected to gas transfer channel 38 through duct 41.
  • metal may flow through orifices 31 and 15; inert gas flowing into gas delivery channels 16 and 21 and through porous refractory inserts 17 and 23 (see Figure 2) provides a positive pressure in the interface of top plate 5 and slide plate 6, while a similar effect takes place at the interface of slide plate 6 and tube holder 7, as shown in Figure 3d (see also refractory inserts 24 and 28 in Figure 2) .
  • the positive inert gas pressure prevents air and other ambient gases from entering the tube holder orifice 32 where it could damage the relatively reactive molten steel.
  • Figure 4e shows the "exit" relationship of the gas delivery channels 16 and 21 and gas transport channels 37 and 38 as the slide plate 6 is moved leftward on termination of operation.
  • the juxtaposition of top plate 5 and slide plate 6 shown in Figures 4c, 4d, and 4e may be contemplated as superimposed on top of corresponding juxtaposition of slide plate 6 on tube 7 illustrated in Figures 3c, 3d, and 3e.
  • My invention includes the slide plate represented in perspective in Figure 5, which shows the gas transfer channels 21 and 22, refractory insert 23, and gas transfer channels 36 and 38.
  • This embodiment shows an H-shaped internal duct 42 which permits the flow of gas from either of the gas transfer channels 36 or 38 to both of the gas delivery channels 21 and 22.
  • Duct 42 may be replaced by a simple duct connecting gas transfer channel 38 to gas delivery duct 21 and/or a simple duct connecting gas transfer channel 36 to gas delivery channel 22.
  • a simple duct connecting gas transfer channel 38 to gas delivery duct 21 and/or a simple duct connecting gas transfer channel 36 to gas delivery channel 22 may be replaced by a simple duct connecting gas transfer channel 38 to gas delivery duct 21 and/or a simple duct connecting gas transfer channel 36 to gas delivery channel 22.
  • my invention includes such embodiments so long as a refractory insert 23 or 24 is present.
  • FIG 6 a variation of the slide plate 6 is shown having no gas transfer channels because it has its own gas supply system represented by T-shaped duct 43 which serves to supply inert gas from an outside source not shown to the passages 25 and 26 of gas delivery channels 21 and 22.
  • Figure 7a shows a conventional joint 60 of a tube holder 7 and a pour tube 8. They are joined by a layer of mortar 61 and enclosed by a steel shroud 62.
  • the mortar tends to develop cracks and otherwise permit the passage of gases into the interior 63 of the tube, and the shroud 62 is typically not made to be gas tight; accordingly gases can easily pass underneath it and gain access to the joint 60.
  • FIG. 7b a variation is shown in which mortar 61 extends only part way into the joint 60, but also is employed on the outside of tube 8.
  • This variation also illustrates the commonly used ring 78 surrounding the entire tube 8 and the weld strip 79 which serves as a seal between the ring 78 and the shroud 62.
  • tight contact of the ring 78 and the tube 8 is assured by holding the ring 78 under compression while the weld strip 79 is secured.
  • circumferential channel 64 is made in the tube holder 7 and partially filled throughout its circumferential form with porous refractory 65, leaving a circumferential gas passage 66.
  • Circumferential gas passage 66 is connected through at least one duct 67 to a source 68 of inert gas such as argon or other suitable gas. Flow of the gas into gas passage 66 from source 68 is controlled in a known manner as a function of the difference between the gas pressure in gas passage 66, measured by pressure transducer 69 and the outside ambient pressure.
  • the pressure difference is generally about 2 to about 5 psi, and is preferably maintained at at least about 3 psi to provide a pressure barrier in the joint — that is, between mating surfaces 73 and 74 — against ambient gas; pressure drop in duct 67 will vary depending on its length and internal diameter, but may be expected to be less than one-half psi and more likely about 0.2 psi.
  • Mortar 70 fills the space between circumferential shoulder 71 on pour tube 8 and complementary circumferential rim 72 on tube holder 7.
  • the mating surface 73 of tube holder 7 and mating surface 74 of pour tube 8 are preferably ground flat within a tolerance of 0.00125cm to 0.03cm.
  • Figure 8b provides the detail particularly of sealant 77 between porous refractory 65 and channel 64.
  • the sealant should be a high temperature resistant sealant and serves to prevent the passage of gas from circumferential gas passage 66 into the joint below mating surface 73 without going through refractory 65.
  • FIG 9a In this version, it is seen that a circumferential shelf 75 is formed on the top of the pour tube 8 and a complementary overhang 76 is formed on the lower terminus of the tube holder 7. Behind the overhang 76 —that is, concentrically external therefrom, a mortar relief groove 77 in the form of a deeper recess is provided to allow for spillage of mortar 70 during placement of the tube holder 7 on the tube 8.
  • Circumferential channel 64 containing porous refractory 65 is similar to that in Figures 8a and 8b, and is also connected through circumferential gas passage 66 and duct 67 to gas source 68.
  • the flow of inert gas to channel 64 may be controlled as a function of pressure in gas passage 66 and ambient external pressures as determined by transducer 69.
  • the effect of the open circumferential gas passage 66 is to provide a gas feed pressure substantially evenly around the circumferential channel 64.
  • care is taken during mortaring not to have an excess of mortar which could find its way into the horizontal portion of the joint (mating surface 74) .
  • Figure 9b in which it will be seen that mortar 70 has been carefully placed so as not to extend onto the horizontal area of mating surface 74 as the mating surfaces 73 and 74 of tube holder 7 and pour tube 8 are brought together.
  • tube holder 7 and pour tube 8 form a mortarless joint at mating surfaces 73 and 74 which have been ground flat to a tolerance of ⁇ 0.03cm.
  • Channel 64 is formed in tube holder 7 as in the other figures and partially filled with porous refractory 65, leaving circumferential gas passage 66 available to conduct gas from duct 67 with even pressure on the upper surface of porous refractory 65, thus assuring its even distribution.
  • an optional centering ring 80 surrounds and reinforces the assembly, and metal banding 81 also is tightly fixed to the circumference of the upper portion of the tube 8.
  • an inert gas such as argon is fed to gas passage 66 from source 68 at such a rate as to maintain a pressure difference between the ambient outside pressure and pressure in the channel 64 of at least 3 pounds per square inch (0.21 kg/cm 2 ) .
  • ray invention minimizes the possibility of destruction of the seal between mating surfaces 73 and 74 by the migration of pieces of mortar; also my invention tends to assure that if any gas is drawn into interior 63 through joint 60 (between mating surfaces 73 and 74 and through mortar 70) , the gas is far more likely to be gas from source 68 than external air which may have seeped into joint 60 from behind shroud 62.
  • the distribution of inert gas around gas passage 66 assures that inert gas will be available with sufficient pressure to any point in the circumference of porous refractory 65.
  • the porous refractory 65 I use for the channel inserts may be any of the porous refractories known in the art, such as porous zirconia refractories or high- alumina porous refractory. In practice typically varying from one-quarter inch thick to three quarters inch thick, they should preferably provide no more than about 2 psi pressure drop (and in any event no more than about 4 psi pressure drop) when a standard inert gas such as argon is flowing through the insert at about 35 standard cubic feet per hour.
  • the refractory may be formed in place in the channel or prefabricated and set into the channel with a sealant as illustrated in Figure 8b.
  • My invention thus includes a slide plate adapted to deliver inert gas as described, a slide gate valve having gas delivery systems as described, and apparatus for delivering molten steel to the top of a continuous caster including a tundish and a flow- directing means below it, each of the tundish and the flow-directing means having substantially flat surfaces forming an interface in at least one of which is built a gas delivery channel including a porous refractory insert extending throughout its length and having a depth extending from said substantially flat surface to partially fill said channel (preferably about half the depth of the channel, or about one- fourth to about three-fourths the depth) ; where gas delivery channels are on both surfaces, the surfaces may also have gas transfer channels for delivering gas from a source on or near one surface to a passage in a channel on the other surface.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

On prévient ou on empêche l'entrée de gaz, tel que de l'air, à travers le raccord d'un tube (8) de coulée et du dispositif de retenue (7) de tube d'un moule à coulée en continu, ou une interface similaire d'une vanne à glissière (5, 6, 7) en faisant passer un gaz inerte dans un canal (16, 21, 22, 27, 64) autour de l'orifice et au niveau de l'interface à travers laquelle de l'air est susceptible d'entrer. Le gaz est réparti uniformément dans le canal sur la configuration entière d'une pièce d'insertion réfractaire poreuse (17, 23, 24, 28, 65) qui vient en contact avec l'interface dans le canal. Ladite pièce d'insertion garantit une répartition uniforme du gaz à l'endroit désiré dans l'interface, fournissant ainsi une pression positive de gaz inerte pour empêcher l'entrée de gaz ambiant.
PCT/US1996/011471 1995-07-27 1996-06-26 Entree limitee de gaz dans un moule a coulee en continu WO1997004901A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP9507604A JPH11510098A (ja) 1995-07-27 1996-06-26 連続鋳造機へのガスの侵入制限装置
MX9800657A MX9800657A (es) 1995-07-27 1996-06-26 Aparato para limitar el ingreso de gas a un colador continuo.
GB9721382A GB2314038B (en) 1995-07-27 1996-06-26 Limiting ingress of gas to continuous caster
DE19681448T DE19681448T1 (de) 1995-07-27 1996-06-26 Begrenzung des Gaseintritts in eine Stranggußanlage

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US08/508,216 US5527281A (en) 1995-07-27 1995-07-27 Substitute tip for urethral catheter
US508,216 1995-07-27
US08/589,392 US5670075A (en) 1996-01-22 1996-01-22 Sealing gas delivery system for sliding joints
US589,392 1996-01-22

Publications (1)

Publication Number Publication Date
WO1997004901A1 true WO1997004901A1 (fr) 1997-02-13

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Family Applications (1)

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PCT/US1996/011471 WO1997004901A1 (fr) 1995-07-27 1996-06-26 Entree limitee de gaz dans un moule a coulee en continu

Country Status (6)

Country Link
JP (1) JPH11510098A (fr)
CA (1) CA2216577A1 (fr)
DE (1) DE19681448T1 (fr)
GB (1) GB2314038B (fr)
MX (1) MX9800657A (fr)
WO (1) WO1997004901A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0913219A1 (fr) * 1997-06-26 1999-05-06 Sollac Procédé de coulée de métal liquide dans un conduit comprenant au moins deux pièces réfractaires
US8273288B2 (en) 2004-11-26 2012-09-25 Rhi Ag Regulation method for throughflow and bottom nozzle of a metallurgical vessel
CN110809499A (zh) * 2017-06-20 2020-02-18 黑崎播磨株式会社 铸造用喷嘴
CN114700487A (zh) * 2022-02-24 2022-07-05 鞍山浦项特种耐火材料有限公司 一种连铸中间包透气滑板制作方法及透气滑板

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Publication number Priority date Publication date Assignee Title
JPS59225862A (ja) * 1983-06-08 1984-12-18 Toshiba Ceramics Co Ltd 連続鋳造用浸漬ノズル
JPH02235565A (ja) * 1989-03-06 1990-09-18 Toshiba Ceramics Co Ltd 溶融金属流量制御装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59225862A (ja) * 1983-06-08 1984-12-18 Toshiba Ceramics Co Ltd 連続鋳造用浸漬ノズル
JPH02235565A (ja) * 1989-03-06 1990-09-18 Toshiba Ceramics Co Ltd 溶融金属流量制御装置

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0913219A1 (fr) * 1997-06-26 1999-05-06 Sollac Procédé de coulée de métal liquide dans un conduit comprenant au moins deux pièces réfractaires
US8273288B2 (en) 2004-11-26 2012-09-25 Rhi Ag Regulation method for throughflow and bottom nozzle of a metallurgical vessel
CN110809499A (zh) * 2017-06-20 2020-02-18 黑崎播磨株式会社 铸造用喷嘴
EP3643427A4 (fr) * 2017-06-20 2021-03-03 Krosakiharima Corporation Buse de coulée
CN114700487A (zh) * 2022-02-24 2022-07-05 鞍山浦项特种耐火材料有限公司 一种连铸中间包透气滑板制作方法及透气滑板

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GB2314038B (en) 1998-12-30
CA2216577A1 (fr) 1997-02-13
GB2314038A (en) 1997-12-17
GB9721382D0 (en) 1997-12-10
DE19681448T1 (de) 1998-10-01
JPH11510098A (ja) 1999-09-07
MX9800657A (es) 1998-04-30

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