CA2069297A1 - Air interceptive structure in a refractory structure - Google Patents
Air interceptive structure in a refractory structureInfo
- Publication number
- CA2069297A1 CA2069297A1 CA002069297A CA2069297A CA2069297A1 CA 2069297 A1 CA2069297 A1 CA 2069297A1 CA 002069297 A CA002069297 A CA 002069297A CA 2069297 A CA2069297 A CA 2069297A CA 2069297 A1 CA2069297 A1 CA 2069297A1
- Authority
- CA
- Canada
- Prior art keywords
- air
- nozzle
- refractory
- nozzle bore
- molten steel
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
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
- B22D41/28—Plates therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
ABSTRACT
A refractory structure, such as a sliding nozzle device having a molten steel outlet, which ensures the isolation of molten steel from air. The refractory structure includes refractory materials defining a nozzle bore (7) for downward flow of molten steel, and has grooves (9) which are formed about the nozzle bore for venting air, and which are communicated with a passage or passages (10) leading to an outside air venting device. This arrangement effectively creates a negative pressure in any refractory joint, and thereby prevents any air from entering the nozzle bore through any joint.
A refractory structure, such as a sliding nozzle device having a molten steel outlet, which ensures the isolation of molten steel from air. The refractory structure includes refractory materials defining a nozzle bore (7) for downward flow of molten steel, and has grooves (9) which are formed about the nozzle bore for venting air, and which are communicated with a passage or passages (10) leading to an outside air venting device. This arrangement effectively creates a negative pressure in any refractory joint, and thereby prevents any air from entering the nozzle bore through any joint.
Description
2~92~
SPECIFIC~TION
AIR INT~RCEPTIV~ sT~ucTunE IN A
REF~ACTO~Y ST~UCTUnE
~FIELD OF ~nT~
This invention relates to an air interceptive structure in a refractory structure, such as a nozzle device for steelmaking, and in particular, a sliding nozzle device used for the treatment of pure steel.
(BACKGROUND OF THE INVENTION~
~ ccording to one process fQr oasting molten ~teel refined in a converter3 eleotric furnace, etc., the molten steel is recelved in a ladle, ancl is continuou31y cast thr-ough a tunclish.
In order to make a oast product of pure steel, it is very important to prevent steel oxidation as oauqed by contact with open air during casting. A oasting proce~s in which steel is isolated from open air is called an air-isolated oasting prooess.
One air-isolated oasting prooess is carried out by feeding molten steel through a tube called a shroud, or through a submerged nozzle, to prevent it from exposure to open air while it flows down.
If a sliding nozzle device is used to control the downward flow of molten steel, however, air is drawn in 2~9297 through the joints of bricks in the device, or through the joints between the shroud or the submerged nozzle and the sliding nozzle device. No satisfactory isolation from air can, therefore, be achieved by the air-isolated casting process employing only the shroud or the submerged nozzle.
There have been various solutions proposed regarding the problem oE the air drawn in through the joints as is hereinabove pointed out. For example, Japanese Patent Laid-Open Application No. 62-50070 proposes the use of a sliding nozzle device having a wholly closed structure defini~g a clos2d atmosphere into which an inert gas, such as argon, ls blown, and Japanese ~atent Laid-Open ~pplioation No. Gl-3653 proposes the evacuatlon of such a closed chamber.
~ large-scale apparatus is, however, required for carrying out any of the methods which have hitherto been proposed, and none of the methGds can produce a satisfactory result of isolation, despite the apparatus employed. The joints of the shroud or the submerged nozzle are, among other things, so constructed as to make it practically impossible to define a closed environment to prevent the molten steel to be cast from exposure to air. The joints of the refractories forming the shroud or the submerged nozzle are formed by mortar or sealing material, but as the downward flow of the molten steel creates a considerably high negative pressure in the bore of the sliding nozzle device through which the ~ 3 ~ 2~692~7 molten steel is caused to flow down, no satisfactory sealing effect can be expected from t.he mortar or sealing material alone.
It is a first object of this invention to provide a structure which ensures the isolatlon of molten steel from air in a refractory structure, such as a sliding nozzle device having a molten steel outlet.
It is a second object of this invention to provide a device whîch is simple in construction, particularly in the construction of suction piping and other related equipment, and yet ensures the i~olation of molten qteel f`rom air in a refractory 9 tructure.
~DISCLOSU~E OF T~IE INVENTION) This invention relates to a structure for interoeptlng air in a refractory ~tructure comprising refractory materials having a nozzle bore for downward flow of molten steelg in which a groove for venting air is formed around the nozzle bore, and communicated with a passage leading to an outside air venting device.
It also provides a simple structure for venting air which comprises one or more passages formed in a member composed of refractory materials and having a nozzle bore, and leading to an outside air venting device, the member having grooves formed around the nozzle bore and communicated with the passages leading to the outside device.
~929~
The grooves for venting air which are formed in the refraotory materials surrounding the nozzle bore work effectively creating a negative pressure in the joints of the refractory materials. Thus, there is no invasion of air into the nozzle bore through the joints of the refractory materials.
When a sliding nozzle is employed, the nozzle bore defined by plate bricks can be filled with molten steel, if the nozzle bore is plaoed at a negative pressure whlch ls higher than that which is created by the control of its flow rate, and which is in the level of say, 10 to 70 cm ~Ig.
As a oonsequence, it is possible to eliminate any lack of uniformity in the rlow o~ molten steel injected into a mold, or tundi3h, and thereby prevent any entrainment of inclusions that might otherwise occur.
~ ccording to this invention, therefore, the use of appropriately shaped bricks enables a considerably high level of reliability in the air-isolated casting of molten steel at low cost, and the connecting holes to whioh the exhaust grooves formed in the joint surfaces are connected provide a simple device.
~BRIEF DESCRIPTION OF DRAWINGS) Fig. 1 shows a sliding nozzle device comprising three plates including a slidable middle plate, and embodying this invention;
20~297 Figs. 2(a), 2(b) and 2(c) are top plan views of air venting grooves according to this invention a~ taken along the lines ~ B-B, and A'-~' or B'-B', respectively, of Fig.
1 ;
Fig. 3 is a top plan view of another form of grooves rormed in a slidable middle plate; and Figs. 4 and 5 show still other emt70diments.
~DESCRIPTION OF THE PREFERRED EMBODIMENT~
The invention will now be described with reference to a sliding nozzle devioe embodying it.
Fig. 1 shows a sliding noææle device whloh is located under an upper nozzle 1 provided at the bottom of a tundish 8, and comprises a stationary upper plate 2, a slldable middle plate 3 and a stationary lower plate 11, and under which a lower nozzle 5 and a submerged nozzle 6 are mounted.
The joint between each two adjoining refractory structures as described above is provided with at least one U-shaped groove 9 extending about a nozzle bore 7 formed substantially in the center thereof.
Figs. 2(a), 2(b) and 2(c~ are top plan views of the plates 2, 3 and 4, respectively, as taken along the lines ~-A, B-B, and ~ ' or B'-B', respectively, of Fig. 1, and showing the grooves 9 formed therein. The U-shaped grooves are so positioned that the grooves of the stationary upper plate 2 and the slidable middle plate 3 are communicated with ~9297 each other, while those of the slidable middle plate 3 and the stationary lower plate 4 are also communicated with eaoh other, when molten steel is caused to flow.
Fig. 3 shows a circular Kroove 9 as an example of modiflcation.
Each groove 9 is associated with a piece of briclc having an exhaust hole 10 and can be evacuated by a vacuum pump mounted outside, though not shown, so that the air tending to invade through the joint between the upper nozzle 1 and the stationary upper plate 2, between the stationary upper plate 2 and the slidable middle plate 3, between the slldablc middle plate 3 and the stationary lower plate ll, between the stationary lower plate ll and the lower nozzle 5, or between the lower nozzle 5 ancl the submerged nozzle 6 may be drawn out through the exhaust hole 10 which is partially connected to the groove 9 by the vacuum pump before it enters the nozzle bore 7.
Figs. 4 and 5 show still more embodiments. Fig. 4 is a top plan view oE a slidable middle plate 3 constituting a modified form of the plate structure shown in Fig. 1 or 3, and having a bore connecting grooves 9 with an exhaust hole 10. Fig. 5 is a sectional view of an assembly of the slidable middle plate 3 shown in Fig. 4, and stationary upper and lower plates 2 and 4.
~ s shown in these figures, the grooves g2 and 93 formed - 7 ~ 9237 in the stationary upper and lower plates, respectively, and e~tending about the nozzle bore 7 are communicated with the hole 11 extending through the sl.idable middle plate 3, and with the passage 10 f`ormed in the stationary upper plate 2 and leading to an outside air venting device, when the slidable middle plate 3 has been caused to slide to open the nozzle bore 7.
This structure makss it sufficient to provide only one passage of the nature shown at 10 in ~ig. 3, and thereby enables the simplification of the related piping, while a plurality of holes 10 are required of` the struature shown in Fig. 1.
~INDUST~IAL FE~SIBIL,ITY~
This invention is applicable not only to a sliding nozzle devioe comprising three plates as hereinabove described by way of example, but also to a device comprising two plates including a slidable lower plate, or combination of a plate (or plates) and a shroud or a submerged nozzle.
Moreover, it is not limited to a sliding nozzle device, but is also applicable to any other nozzle, or pipe, or device for handling molten metal which need be isolated from the open air.
SPECIFIC~TION
AIR INT~RCEPTIV~ sT~ucTunE IN A
REF~ACTO~Y ST~UCTUnE
~FIELD OF ~nT~
This invention relates to an air interceptive structure in a refractory structure, such as a nozzle device for steelmaking, and in particular, a sliding nozzle device used for the treatment of pure steel.
(BACKGROUND OF THE INVENTION~
~ ccording to one process fQr oasting molten ~teel refined in a converter3 eleotric furnace, etc., the molten steel is recelved in a ladle, ancl is continuou31y cast thr-ough a tunclish.
In order to make a oast product of pure steel, it is very important to prevent steel oxidation as oauqed by contact with open air during casting. A oasting proce~s in which steel is isolated from open air is called an air-isolated oasting prooess.
One air-isolated oasting prooess is carried out by feeding molten steel through a tube called a shroud, or through a submerged nozzle, to prevent it from exposure to open air while it flows down.
If a sliding nozzle device is used to control the downward flow of molten steel, however, air is drawn in 2~9297 through the joints of bricks in the device, or through the joints between the shroud or the submerged nozzle and the sliding nozzle device. No satisfactory isolation from air can, therefore, be achieved by the air-isolated casting process employing only the shroud or the submerged nozzle.
There have been various solutions proposed regarding the problem oE the air drawn in through the joints as is hereinabove pointed out. For example, Japanese Patent Laid-Open Application No. 62-50070 proposes the use of a sliding nozzle device having a wholly closed structure defini~g a clos2d atmosphere into which an inert gas, such as argon, ls blown, and Japanese ~atent Laid-Open ~pplioation No. Gl-3653 proposes the evacuatlon of such a closed chamber.
~ large-scale apparatus is, however, required for carrying out any of the methods which have hitherto been proposed, and none of the methGds can produce a satisfactory result of isolation, despite the apparatus employed. The joints of the shroud or the submerged nozzle are, among other things, so constructed as to make it practically impossible to define a closed environment to prevent the molten steel to be cast from exposure to air. The joints of the refractories forming the shroud or the submerged nozzle are formed by mortar or sealing material, but as the downward flow of the molten steel creates a considerably high negative pressure in the bore of the sliding nozzle device through which the ~ 3 ~ 2~692~7 molten steel is caused to flow down, no satisfactory sealing effect can be expected from t.he mortar or sealing material alone.
It is a first object of this invention to provide a structure which ensures the isolatlon of molten steel from air in a refractory structure, such as a sliding nozzle device having a molten steel outlet.
It is a second object of this invention to provide a device whîch is simple in construction, particularly in the construction of suction piping and other related equipment, and yet ensures the i~olation of molten qteel f`rom air in a refractory 9 tructure.
~DISCLOSU~E OF T~IE INVENTION) This invention relates to a structure for interoeptlng air in a refractory ~tructure comprising refractory materials having a nozzle bore for downward flow of molten steelg in which a groove for venting air is formed around the nozzle bore, and communicated with a passage leading to an outside air venting device.
It also provides a simple structure for venting air which comprises one or more passages formed in a member composed of refractory materials and having a nozzle bore, and leading to an outside air venting device, the member having grooves formed around the nozzle bore and communicated with the passages leading to the outside device.
~929~
The grooves for venting air which are formed in the refraotory materials surrounding the nozzle bore work effectively creating a negative pressure in the joints of the refractory materials. Thus, there is no invasion of air into the nozzle bore through the joints of the refractory materials.
When a sliding nozzle is employed, the nozzle bore defined by plate bricks can be filled with molten steel, if the nozzle bore is plaoed at a negative pressure whlch ls higher than that which is created by the control of its flow rate, and which is in the level of say, 10 to 70 cm ~Ig.
As a oonsequence, it is possible to eliminate any lack of uniformity in the rlow o~ molten steel injected into a mold, or tundi3h, and thereby prevent any entrainment of inclusions that might otherwise occur.
~ ccording to this invention, therefore, the use of appropriately shaped bricks enables a considerably high level of reliability in the air-isolated casting of molten steel at low cost, and the connecting holes to whioh the exhaust grooves formed in the joint surfaces are connected provide a simple device.
~BRIEF DESCRIPTION OF DRAWINGS) Fig. 1 shows a sliding nozzle device comprising three plates including a slidable middle plate, and embodying this invention;
20~297 Figs. 2(a), 2(b) and 2(c) are top plan views of air venting grooves according to this invention a~ taken along the lines ~ B-B, and A'-~' or B'-B', respectively, of Fig.
1 ;
Fig. 3 is a top plan view of another form of grooves rormed in a slidable middle plate; and Figs. 4 and 5 show still other emt70diments.
~DESCRIPTION OF THE PREFERRED EMBODIMENT~
The invention will now be described with reference to a sliding nozzle devioe embodying it.
Fig. 1 shows a sliding noææle device whloh is located under an upper nozzle 1 provided at the bottom of a tundish 8, and comprises a stationary upper plate 2, a slldable middle plate 3 and a stationary lower plate 11, and under which a lower nozzle 5 and a submerged nozzle 6 are mounted.
The joint between each two adjoining refractory structures as described above is provided with at least one U-shaped groove 9 extending about a nozzle bore 7 formed substantially in the center thereof.
Figs. 2(a), 2(b) and 2(c~ are top plan views of the plates 2, 3 and 4, respectively, as taken along the lines ~-A, B-B, and ~ ' or B'-B', respectively, of Fig. 1, and showing the grooves 9 formed therein. The U-shaped grooves are so positioned that the grooves of the stationary upper plate 2 and the slidable middle plate 3 are communicated with ~9297 each other, while those of the slidable middle plate 3 and the stationary lower plate 4 are also communicated with eaoh other, when molten steel is caused to flow.
Fig. 3 shows a circular Kroove 9 as an example of modiflcation.
Each groove 9 is associated with a piece of briclc having an exhaust hole 10 and can be evacuated by a vacuum pump mounted outside, though not shown, so that the air tending to invade through the joint between the upper nozzle 1 and the stationary upper plate 2, between the stationary upper plate 2 and the slidable middle plate 3, between the slldablc middle plate 3 and the stationary lower plate ll, between the stationary lower plate ll and the lower nozzle 5, or between the lower nozzle 5 ancl the submerged nozzle 6 may be drawn out through the exhaust hole 10 which is partially connected to the groove 9 by the vacuum pump before it enters the nozzle bore 7.
Figs. 4 and 5 show still more embodiments. Fig. 4 is a top plan view oE a slidable middle plate 3 constituting a modified form of the plate structure shown in Fig. 1 or 3, and having a bore connecting grooves 9 with an exhaust hole 10. Fig. 5 is a sectional view of an assembly of the slidable middle plate 3 shown in Fig. 4, and stationary upper and lower plates 2 and 4.
~ s shown in these figures, the grooves g2 and 93 formed - 7 ~ 9237 in the stationary upper and lower plates, respectively, and e~tending about the nozzle bore 7 are communicated with the hole 11 extending through the sl.idable middle plate 3, and with the passage 10 f`ormed in the stationary upper plate 2 and leading to an outside air venting device, when the slidable middle plate 3 has been caused to slide to open the nozzle bore 7.
This structure makss it sufficient to provide only one passage of the nature shown at 10 in ~ig. 3, and thereby enables the simplification of the related piping, while a plurality of holes 10 are required of` the struature shown in Fig. 1.
~INDUST~IAL FE~SIBIL,ITY~
This invention is applicable not only to a sliding nozzle devioe comprising three plates as hereinabove described by way of example, but also to a device comprising two plates including a slidable lower plate, or combination of a plate (or plates) and a shroud or a submerged nozzle.
Moreover, it is not limited to a sliding nozzle device, but is also applicable to any other nozzle, or pipe, or device for handling molten metal which need be isolated from the open air.
Claims (2)
1. A refractory structure so constructed as to intercept air, said structure comprising members made of a refractory material and having a nozzle bore, said members having grooves formed about said nozzle bore for venting air, said grooves being communicated with passages leading to an outside air venting device.
2. A refractory structure so constructed as to shut out air, said structure comprising members made of a refractory material and having a nozzle bore, said members having grooves formed about said nozzle bore for venting air, and a connecting hole for communicating with said grooves, said hole being communicated with a passage leading to an outside air venting device.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2-212090 | 1990-08-10 | ||
| JP21209090 | 1990-08-10 | ||
| JP3-111950 | 1991-05-16 | ||
| JP3111950A JPH04228256A (en) | 1990-08-10 | 1991-05-16 | Air-sealing structure in nozzle hole |
| PCT/JP1991/001060 WO1992002323A1 (en) | 1990-08-10 | 1991-08-08 | Air interceptive structure in fire resistant structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2069297A1 true CA2069297A1 (en) | 1992-02-11 |
Family
ID=26451214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002069297A Abandoned CA2069297A1 (en) | 1990-08-10 | 1991-08-08 | Air interceptive structure in a refractory structure |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0495999A4 (en) |
| JP (1) | JPH04228256A (en) |
| KR (1) | KR920702265A (en) |
| AU (1) | AU8317691A (en) |
| BR (1) | BR9105858A (en) |
| CA (1) | CA2069297A1 (en) |
| WO (1) | WO1992002323A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1004804A4 (en) * | 1991-05-21 | 1993-02-02 | Internat Ind Engineering S A | Belt seal tube casting. |
| JPH05115964A (en) * | 1991-10-24 | 1993-05-14 | Shinagawa Refract Co Ltd | Air shutting method in slide valve |
| KR100775084B1 (en) * | 2006-12-20 | 2007-11-08 | 주식회사 포스코 | Tundish for insulator |
| JP5742992B1 (en) * | 2014-03-13 | 2015-07-01 | 品川リフラクトリーズ株式会社 | Slab continuous casting equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5083312U (en) * | 1973-11-30 | 1975-07-17 | ||
| JPH01309768A (en) * | 1988-06-09 | 1989-12-14 | Kawasaki Steel Corp | Method and apparatus for continuously casting molten steel under non-oxidization |
-
1991
- 1991-05-16 JP JP3111950A patent/JPH04228256A/en active Pending
- 1991-08-08 AU AU83176/91A patent/AU8317691A/en not_active Abandoned
- 1991-08-08 KR KR1019920700596A patent/KR920702265A/en not_active Application Discontinuation
- 1991-08-08 BR BR919105858A patent/BR9105858A/en unknown
- 1991-08-08 CA CA002069297A patent/CA2069297A1/en not_active Abandoned
- 1991-08-08 EP EP19910914198 patent/EP0495999A4/en not_active Withdrawn
- 1991-08-08 WO PCT/JP1991/001060 patent/WO1992002323A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| KR920702265A (en) | 1992-09-03 |
| BR9105858A (en) | 1992-09-22 |
| WO1992002323A1 (en) | 1992-02-20 |
| EP0495999A1 (en) | 1992-07-29 |
| JPH04228256A (en) | 1992-08-18 |
| AU8317691A (en) | 1992-03-02 |
| EP0495999A4 (en) | 1992-12-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |