CN110976838B - Casting device and method for aluminum-containing steel - Google Patents
Casting device and method for aluminum-containing steel Download PDFInfo
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- CN110976838B CN110976838B CN201911290220.1A CN201911290220A CN110976838B CN 110976838 B CN110976838 B CN 110976838B CN 201911290220 A CN201911290220 A CN 201911290220A CN 110976838 B CN110976838 B CN 110976838B
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- 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
- B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
- B22D41/18—Stopper-rods therefor
- B22D41/186—Stopper-rods therefor with means for injecting a fluid into the melt
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- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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Abstract
The invention discloses a casting device and a method for aluminum-containing steel, relating to the technical field of steelmaking continuous casting, wherein the device comprises: a stopper body; the gas channel is arranged along the extending direction of the stopper rod body and is coaxially arranged with the stopper rod body; the stopper rod head is connected with the bottom of the stopper rod body, a through hole is formed in the stopper rod head, and the through hole is communicated with the gas channel; the flow divider is arranged at one end, far away from the stopper rod body, of the stopper rod head and is communicated with the stopper rod head through the through hole; the porous plug is arranged at one end of the diverter far away from the head of the stopper rod, and the porous plug is communicated with the diverter, so that the technical effects of greatly reducing the water gap blocking degree of casting the aluminum-containing steel, improving the casting effect and improving the product quality are achieved.
Description
Technical Field
The invention relates to the technical field of steelmaking continuous casting, in particular to a casting device and method for aluminum-containing steel.
Background
The aluminum-containing steel is widely applied to the fields of automobiles, household appliances, buildings, national defense and the like. The biggest problem in casting aluminum-containing steel is that aluminum-containing inclusions tend to accumulate on the inner wall of the nozzle, forming nozzle clogging, which can create two major hazards: firstly, continuous casting and casting interruption are caused, and the production cost is improved; secondly, the water gap blockage falls off to cause the linear defect on the surface of the product. Therefore, the control of the water gap blockage has great significance for reducing the production cost and improving the product quality.
The method for controlling the nozzle clogging generally comprises the steps of feeding a calcium wire into molten steel for calcium treatment, and modifying aluminum-containing inclusions into low-melting-point inclusions. However, the calcium treatment introduces a new pollution source and affects the cleanliness of molten steel, and the mainstream mode at present is to blow argon into a stopper rod in the continuous casting process to form a gas film on the inner walls of the molten steel and a refractory material, so as to prevent aluminum-containing impurities from being bonded on the inner wall of a water gap and reduce the water gap blockage. The utility model provides a to the stopper stick let in argon gas generally adopt the straight tube to let in and the ventilative stopper lets in among the prior art, however, these two kinds of modes make the unable inseparable mouth of a river inner wall of laminating of bubble, hardly form the air film, prevent that the mouth of a river jam effect is not showing.
Disclosure of Invention
The invention provides a casting device and method for aluminum-containing steel, which are used for solving the technical problem that in the prior art, bubbles cannot be tightly attached to the inner wall of a water gap in the argon blowing process of a stopper rod, so that the water gap blocking effect is poor, and the technical effects of greatly reducing the water gap blocking degree of the cast aluminum-containing steel, improving the casting effect and improving the product quality are achieved.
In a first aspect, the present invention provides a casting apparatus for aluminium-containing steel, the apparatus comprising: a stopper body; the gas channel is arranged along the extending direction of the stopper rod body and is coaxially arranged with the stopper rod body; the stopper rod head is connected with the bottom of the stopper rod body, a through hole is formed in the stopper rod head, and the through hole is communicated with the gas channel; the flow divider is arranged at one end, far away from the stopper rod body, of the stopper rod head and is communicated with the stopper rod head through the through hole; the porous plug is arranged at one end of the flow divider, which is far away from the head part of the stopper rod, and the porous plug is communicated with the flow divider.
Preferably, the method further comprises the following steps: the air permeable sieve is embedded inside the through hole.
Preferably, the splitter is provided with a plurality of air gaps which are uniformly distributed along the circumferential direction.
Preferably, the width of each air gap is 5-8 mm.
Preferably, the outer diameter of the stopper rod body ranges from 120 mm to 150 mm.
In a second aspect, the present invention provides a casting method for aluminium-containing steel, the method comprising: step 1: starting to cast aluminum-containing steel, blowing argon into the gas channel from the top end of the stopper rod body when the casting process is in a first preset time, and controlling the flow of the argon within a first preset range; step 2: when the casting process is in a second preset time, argon is blown into the gas channel from the top end of the stopper rod body, and the flow of the argon is controlled within a second preset range; and step 3: and when the casting process is in a third preset time, blowing argon into the gas channel from the top end of the stopper rod body, and controlling the flow of the argon within a third preset range.
Preferably, the mass percentage of Al in the aluminum-containing steel ranges from 0.1% to 3.0%.
Preferably, the first preset time is 0-30 min after the casting is started; the second preset time is from 30min before the casting to 30min before the casting is finished; the third preset time is within 30min before the casting is finished.
Preferably, the first preset range is 3-6L/min; the second preset range is 8-12L/min; the third preset range is 4-8L/min.
One or more technical solutions in the embodiments of the present invention at least have one or more of the following technical effects:
the embodiment of the invention provides a casting device and a casting method for aluminum-containing steel, which comprises a stopper rod body, a stopper rod head, a flow divider, a porous plug and a gas channel, wherein the stopper rod head is connected with the bottom of the stopper rod body, and a through hole is formed in the stopper rod head; the flow divider is arranged at one end of the stopper rod head part far away from the stopper rod body; porous stopper sets up the one end of keeping away from the stopper rod head at the shunt, let in the back when argon gas from the gas passage upper portion of stopper rod body, the direct immersion nozzle inner wall of laminating of big bubble after partly coming out from the shunt, form the gas film, thereby effectively prevent the mouth of a river jam of aluminium-containing steel, partly comes out from porous stopper, the tiny bubble that comes out gets into the crystallizer, reach the mesh that can effectively get rid of the inclusion, thereby it blows the argon in-process at the stopper rod among the prior art to have solved, the unable inseparable mouth of a river inner wall that laminates of bubble, lead to the mouth of a river to block up the poor technical problem of effect, reached and reduced the mouth of a river jam degree of casting aluminium-containing steel by a wide margin, improve.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 is a schematic structural diagram of a casting device for aluminum-containing steel according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of the flow divider in FIG. 1;
FIG. 3 is a schematic flow chart of a method for casting aluminum-containing steel according to an embodiment of the present invention.
Description of reference numerals: the stopper comprises a stopper body 1, a stopper head 2, a ventilating sieve 3, a flow divider 4 and a porous stopper 5.
Detailed Description
The embodiment of the invention provides a casting device and method for aluminum-containing steel, which are used for solving the technical problem that in the prior art, bubbles cannot be tightly attached to the inner wall of a water gap in the argon blowing process of a stopper rod, so that the water gap blocking effect is poor.
The technical scheme in the embodiment of the invention has the following overall structure:
the invention provides a casting device and a method for aluminum-containing steel, which are characterized in that a stopper rod body is adopted; the gas channel is arranged along the extending direction of the stopper rod body and is coaxially arranged with the stopper rod body; the stopper rod head is connected with the bottom of the stopper rod body, a through hole is formed in the stopper rod head, and the through hole is communicated with the gas channel; the flow divider is arranged at one end, far away from the stopper rod body, of the stopper rod head and is communicated with the stopper rod head through the through hole; the porous plug is arranged at one end of the diverter far away from the head of the stopper rod, and the porous plug is communicated with the diverter, so that the technical effects of greatly reducing the water gap blocking degree of casting the aluminum-containing steel, improving the casting effect and improving the product quality are achieved.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
An embodiment of the present invention provides a casting apparatus for aluminum-containing steel, and referring to fig. 1, the casting apparatus for aluminum-containing steel includes: a stopper body 1.
Further, the method also comprises the following steps: the gas channel, the gas channel is followed the extending direction setting of stopper stick body 1, just the gas channel with stopper stick body 1 coaxial setting.
Further, the outer diameter range of the stopper rod body 1 is 120-150 mm.
Specifically, the stopper body 1 is a main external structure of the casting device, and the shape thereof may be set according to actual needs, and may be designed to be, for example, a cylindrical shape, a rectangular parallelepiped shape, or the like. In the present embodiment, the stopper rod body 1 is preferably cylindrical, and the stopper rod body 1 has an outer diameter
The range of (A) is 120 to 150 mm. Further, a gas channel is opened inside the stopper rod body 1, and the gas channel and the stopper rod body 1 have the same central axis, that is, the gas channel is arranged at the central position of the stopper rod body 1. Gas passage sets up along stopper rod body 1's length direction, and runs through the setting from the top of stopper rod body 1 bottom, makes like this when in-service use, can let in gas through this gas passage.
The casting device for aluminum-containing steel further comprises: the stopper rod comprises a stopper rod head 2, wherein the stopper rod head 2 is connected with the bottom of the stopper rod body 1, and a through hole is formed in the stopper rod head 2.
Further, the method also comprises the following steps: and the air-permeable screen 3 is embedded in the through hole.
Particularly, stopper rod head 2 sets up in the bottom of stopper rod body 1, and stopper rod head 2's shape is the taper structure, offers a cross section in the inside of stopper rod head 2 simultaneously and is isosceles trapezoid's through-hole, and then can inlay in the through-hole and establish ventilative sieve 3, and the upper surface of ventilative sieve 3 is higher than stopper rod head 2 and stopper rod body 1's combination plane slightly.
The casting device for aluminum-containing steel further comprises: a flow divider 4, wherein the flow divider 4 is arranged at one end of the stopper rod head 2 far away from the stopper rod body 1; a porous plug 5, said porous plug 5 being disposed at an end of said flow diverter 4 remote from said stopper rod head 2.
Furthermore, a plurality of air gaps which are uniformly distributed along the circumferential direction are formed in the flow divider 4.
Furthermore, the width of each air gap is 5-8 mm.
Specifically, the flow divider 4 in the present embodiment is an annular gas flow divider, and the flow divider 4 is attached below the stopper rod head 2 and the gas permeable screen 3, and further, a porous plug 5 is fitted below the flow divider 4. As shown in fig. 2, the flow divider 4 is composed of a plurality of air gaps uniformly distributed in the circumferential direction, and in this embodiment, the number of the air gaps is preferably three, and an included angle between every two of the three air gaps is 120 °. The width scope of gas seam is 5 ~ 8mm to realize that gas distribution is even, the effectual purpose of reposition of redundant personnel. Through the annular gas shunt in this embodiment, argon gas lets in the back from stopper rod body upper portion, and partly big bubble after coming out from the shunt directly laminates immersion nozzle inner wall, forms the air film to effectively prevent the mouth of a river of containing the aluminium steel and block up, partly come out from porous stopper, the tiny bubble that comes out gets into the crystallizer, reaches the purpose that can effectively get rid of the inclusion.
Example two
An embodiment of the present invention provides a casting method for aluminum-containing steel, please refer to fig. 3, the method includes:
step 1: and (3) casting the aluminum-containing steel, starting to blow argon into the gas channel from the top end of the stopper rod body 1 when the casting process is in the first preset time, and controlling the flow of the argon within a first preset range.
Further, the mass percentage range of Al in the aluminum-containing steel is 0.1-3.0%.
Specifically, when the stopper rod with the annular gas splitter is used, in the casting process, the pulling speed is low within a first preset time range, namely 0-30 min after the casting device is used, if the gas blowing amount is too large, the liquid level of the crystallizer is easy to tumble seriously, and at the moment, the gas blowing amount needs to be reduced properly, so that the flow rate of argon blown from the top end of the stopper rod body 1 is controlled to be 3-6L/min.
Step 2: and when the casting process is in a second preset time, argon is blown into the gas channel from the top end of the stopper rod body, and the flow of the argon is controlled within a second preset range.
Specifically, a casting device is used for casting for 30min to 30min before casting is finished, in the process, the pulling speed reaches a normal value, the blowing amount is properly increased to ensure the anti-blocking effect, and the flow rate of argon blown into the top end of the stopper rod is controlled to be 8-12L/min.
And step 3: and when the casting process is in a third preset time, blowing argon into the gas channel from the top end of the stopper rod body, and controlling the flow of the argon within a third preset range.
Specifically, a casting device is used from 30min before casting is finished to the casting is finished, in the process, the pulling speed is reduced, the argon consumption is reduced properly, and the flow rate of argon blown from the top end of a stopper rod is controlled to be 4-8L/min when the temperature of molten steel is reduced seriously in the late stage of casting; by using the method, the technical effects that the degree of blockage of the water gap for casting the aluminum-containing steel is greatly reduced, and the tonnage of steel cast at a single water gap reaches 1050t can be achieved.
Further, the aluminum-containing steel with the aluminum content of 0.1% is cast for one time, the weight of the steel ladle is 300t, the outer diameter of the stopper rod is 127mm, after the argon is introduced from the upper part of the stopper rod body by using the casting device, one part of the argon is tightly attached to the inner wall of the water gap after coming out of the annular splitter to form an air film, and the water gap is effectively prevented from being blocked. One part of the slag enters the porous plug to form micro bubbles, and the micro bubbles enter the crystallizer to remove impurities. The continuous casting is carried out for 11 furnaces, and the submerged nozzle is replaced for one time 6 furnaces before and after the continuous casting. The casting time is 0-30 min, the argon flow is set to be 5L/min, the argon flow is set to be 10L/min for 30-390 min of casting, and the argon flow is set to be 6L/min for 392 min-422 min of casting (casting is finished). And observing the inner wall of the submerged nozzle after the casting is finished, wherein the inner wall of the submerged nozzle is smooth and basically has no blocking product. The steel plate surface tracking detection system finds that the surface quality of the cold-rolled steel plate is good.
Further, the aluminum-containing steel with 0.2 percent of aluminum content is cast once, the weight of the steel ladle is 300t, the outer diameter of the stopper rod is 128mm, and after argon is introduced from the upper part of the stopper rod by using the casting device, one part of the argon is tightly attached to the inner wall of the water gap after coming out of the annular flow divider to form an air film, so that the water gap is effectively prevented from being blocked. One part of the slag enters the porous plug to form micro bubbles, and the micro bubbles enter the crystallizer to remove impurities. The continuous casting 7 furnace of the casting time does not change the submerged nozzle. The argon flow rate of the casting time is set to be 4L/min in 0-30 min, the argon flow rate of the casting time is set to be 9L/min in 30-251 min, and the argon flow rate of the casting time is set to be 5L/min in 251-281 min (casting end). And observing the inner wall of the submerged nozzle after the casting is finished, wherein the inner wall of the submerged nozzle is smooth and basically has no blocking product. The steel plate surface tracking detection system finds that the surface quality of the cold-rolled steel plate is good.
Further, a first-time casting of the aluminum-containing steel with the aluminum content of 0.3% is cast. The weight of the ladle is 210t, the outer diameter of the stopper rod is 121mm, and by using the casting device, after argon is introduced from the upper part of the stopper rod, one part of argon is tightly attached to the inner wall of the water gap after coming out from the annular splitter to form an air film, so that the water gap is effectively prevented from being blocked. One part of the slag enters the porous plug to form micro bubbles, and the micro bubbles enter the crystallizer to remove impurities. The secondary continuous casting 12 furnace is replaced by one immersion nozzle, the inner wall of the replaced immersion nozzle is smooth, and basically no blocking product exists. The argon flow rate is set to be 5L/min for 0-30 min of casting, 10L/min for 30-453 min of casting, and 7L/min for 453-483 min (casting is finished). And observing the inner wall of the submerged nozzle after the casting is finished, wherein the inner wall of the submerged nozzle is smooth and basically has no blocking product. The steel plate surface tracking detection system finds that the surface quality of the cold-rolled steel plate is good.
Further, the pouring of the aluminum-containing steel with the aluminum content of 1.3 percent is carried out for several times, the weight of the steel ladle is 210t, the outer diameter of the stopper rod is 122mm, and after the argon is introduced from the upper part of the stopper rod by using the pouring device, a part of the argon is tightly attached to the inner wall of the water gap after coming out from the annular splitter to form an air film, so that the water gap is effectively prevented from being blocked. One part of the gas-permeable plug comes out of the gas-permeable plug to form micro bubbles which enter the crystallizer to remove the impurities. The submerged nozzle of the continuous casting 8 furnace is not replaced in the casting time, and the inner wall of the submerged nozzle is smooth after the casting time is finished and basically has no blocking product. The argon flow rate of the casting time is set to be 6L/min in 0-30 min, the argon flow rate of the casting time is set to be 10L/min in 30-283 min, and the argon flow rate of the casting time is set to be 8L/min in 283-313 min (the casting is finished). And observing the inner wall of the submerged nozzle after the casting is finished, wherein the inner wall of the submerged nozzle is smooth and basically has no blocking product. The steel plate surface tracking detection system finds that the surface quality of the cold-rolled steel plate is good.
One or more technical solutions in the embodiments of the present invention at least have one or more of the following technical effects:
the embodiment of the invention provides a casting device and a casting method for aluminum-containing steel, which comprises a stopper rod body, a stopper rod head, a flow divider, a porous plug and a gas channel, wherein the stopper rod head is connected with the bottom of the stopper rod body, and a through hole is formed in the stopper rod head; the flow divider is arranged at one end of the stopper rod head part far away from the stopper rod body; porous stopper sets up the one end of keeping away from the stopper rod head at the shunt, let in the back when argon gas from the gas passage upper portion of stopper rod body, the direct immersion nozzle inner wall of laminating of big bubble after partly coming out from the shunt, form the gas film, thereby effectively prevent the mouth of a river jam of aluminium-containing steel, partly comes out from porous stopper, the tiny bubble that comes out gets into the crystallizer, reach the mesh that can effectively get rid of the inclusion, thereby it blows the argon in-process at the stopper rod among the prior art to have solved, the unable inseparable mouth of a river inner wall that laminates of bubble, lead to the mouth of a river to block up the poor technical problem of effect, reached and reduced the mouth of a river jam degree of casting aluminium-containing steel by a wide margin, improve.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (7)
1. A casting apparatus for aluminum-containing steel, the apparatus comprising:
a stopper body;
the gas channel is arranged along the extending direction of the stopper rod body and is coaxially arranged with the stopper rod body;
the stopper rod head is connected with the bottom of the stopper rod body, a through hole is formed in the stopper rod head, and the through hole is communicated with the gas channel;
the flow divider is arranged at one end, far away from the stopper rod body, of the stopper rod head and is communicated with the stopper rod head through the through hole;
a porous plug disposed at an end of the diverter distal from the stopper rod head, the porous plug in communication with the diverter;
the air permeable sieve is embedded in the through hole;
the flow divider is provided with a plurality of air gaps which are uniformly distributed along the circumferential direction.
2. The casting apparatus for aluminum-containing steel as recited in claim 1, wherein each of the gas gaps has a width of 5 to 8 mm.
3. The casting apparatus for aluminum-containing steel as claimed in claim 1, wherein the stopper rod body has an outer diameter in a range of 120 to 150 mm.
4. A casting method for aluminium-containing steel, applied to a device according to claims 1-3, characterized in that it comprises:
step 1: starting to cast aluminum-containing steel, blowing argon into the gas channel from the top end of the stopper rod body when the casting process is in a first preset time, and controlling the flow of the argon within a first preset range;
step 2: when the casting process is in a second preset time, argon is blown into the gas channel from the top end of the stopper rod body, and the flow of the argon is controlled within a second preset range;
and step 3: and when the casting process is in a third preset time, blowing argon into the gas channel from the top end of the stopper rod body, and controlling the flow of the argon within a third preset range.
5. The casting method for aluminum-containing steel as recited in claim 4, wherein the mass percentage of Al in the aluminum-containing steel is in a range of 0.1 to 3.0%.
6. The casting method for aluminum-containing steel as recited in claim 4, wherein the first predetermined time is 0 to 30min from the start of casting; the second preset time is from 30min before the casting to 30min before the casting is finished; the third preset time is within 30min before the casting is finished.
7. The casting method for aluminum-containing steel as recited in claim 6, wherein the first predetermined range is 3 to 6L/min;
the second preset range is 8-12L/min;
the third preset range is 4-8L/min.
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| CN201911290220.1A CN110976838B (en) | 2019-12-16 | 2019-12-16 | Casting device and method for aluminum-containing steel |
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| CN201911290220.1A CN110976838B (en) | 2019-12-16 | 2019-12-16 | Casting device and method for aluminum-containing steel |
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| CN111822689B (en) * | 2020-07-27 | 2021-08-31 | 宝武集团马钢轨交材料科技有限公司 | High-quality steel continuous casting argon blowing stopper rod, stopper rod argon blowing system and argon blowing method |
| CN114769573B (en) * | 2022-04-28 | 2023-08-25 | 马鞍山钢铁股份有限公司 | Stopper rod and method for preventing continuous casting pouring low-temperature accident |
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|---|---|---|---|---|
| US5071043A (en) * | 1989-08-03 | 1991-12-10 | Vesuvius Crucible Company | Stopper rod with an improved gas distribution |
| FR2728491B1 (en) * | 1994-12-22 | 1997-03-14 | Lorraine Laminage | DEVICE FOR CASTING A LIQUID METAL WITH INJECTION OF AN INERATED GAS INTO THE LIQUID METAL DURING CASTING |
| CN204381357U (en) * | 2014-11-27 | 2015-06-10 | 华耐国际（宜兴）高级陶瓷有限公司 | A kind of stopper that can control argon flow amount |
| CN207358156U (en) * | 2017-10-25 | 2018-05-15 | 淄博双马新材料科技股份有限公司 | A kind of stopper to prolong the service life |
| CN108607980A (en) * | 2018-08-21 | 2018-10-02 | 北京利尔高温材料股份有限公司 | It is a kind of can efficiently blowing argon gas and with removal wadding stream function stopper |
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2019
- 2019-12-16 CN CN201911290220.1A patent/CN110976838B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5071043A (en) * | 1989-08-03 | 1991-12-10 | Vesuvius Crucible Company | Stopper rod with an improved gas distribution |
| FR2728491B1 (en) * | 1994-12-22 | 1997-03-14 | Lorraine Laminage | DEVICE FOR CASTING A LIQUID METAL WITH INJECTION OF AN INERATED GAS INTO THE LIQUID METAL DURING CASTING |
| CN204381357U (en) * | 2014-11-27 | 2015-06-10 | 华耐国际（宜兴）高级陶瓷有限公司 | A kind of stopper that can control argon flow amount |
| CN207358156U (en) * | 2017-10-25 | 2018-05-15 | 淄博双马新材料科技股份有限公司 | A kind of stopper to prolong the service life |
| CN108607980A (en) * | 2018-08-21 | 2018-10-02 | 北京利尔高温材料股份有限公司 | It is a kind of can efficiently blowing argon gas and with removal wadding stream function stopper |
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