CN107225231A - A kind of annular air curtain barricade wall of continuous casting production and its molten steel air purge method - Google Patents
A kind of annular air curtain barricade wall of continuous casting production and its molten steel air purge method Download PDFInfo
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- CN107225231A CN107225231A CN201710575311.4A CN201710575311A CN107225231A CN 107225231 A CN107225231 A CN 107225231A CN 201710575311 A CN201710575311 A CN 201710575311A CN 107225231 A CN107225231 A CN 107225231A
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- air curtain
- barricade wall
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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
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
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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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/117—Refining the metal by treating with gases
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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
- B22D41/02—Linings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
The present invention relates to a kind of annular air curtain barricade wall of continuous casting production, including air curtain barricade wall body (1), disperse formula is breathed freely ring (2), air chamber (3), air inlet pipe (4), air curtain barricade wall body is in annular, its middle part is provided with cylindrical mounting hole, the ventilative ring (2) of disperse formula of annular is provided with air curtain barricade wall body (1), the upper surface of air curtain barricade wall body (1) is stretched out on the top of the ventilative ring of disperse formula, air chamber (3) takes shape in the bottom of the ventilative ring of disperse formula, the sidepiece of air chamber is connected with air inlet pipe (4), one end of air inlet pipe is connected with air chamber, the other end stretches out from the sidepiece of air curtain barricade wall body, air inlet pipe connection metal tube (8) is connected with outside argon gas source of the gas, it is blown into argon gas, ring-type air curtain barrier is formed around filling pipe end brick cup, to the whole air purges of molten steel that will enter tundish upper nozzle, improve inclusion removal rate.
Description
Technical field
The present invention relates to a kind of annular air curtain barricade wall of continuous casting production and its molten steel air purge method, belong to Ferrous Metallurgy continuous casting
Tundish metallurgy technology field.
Background technology
Continuous casting production air curtain barricade wall technology is the removal non-metallic inclusions in molten steel grown up in 20 end of the centurys
New technology, its principle is to be placed in a certain optimum bit in tundish bottom using the bar shaped air curtain barricade wall vertical with molten steel flow direction
Put, be blown into argon gas, argon gas floats to form one of Argon Bubble air curtain barrier through air curtain barricade wall, with nonmetallic folder in promotion molten steel
Debris floats and remove function.But bar shaped air curtain barricade wall is because inclusion removal rate is low, service life is low, pushed away as the technology is restricted
The key technology difficulty extensively applied, the defect or deficiency existed：(1) in the upward vertical line in bar shaped air curtain barricade wall two ends and tundish
Occur that in the blind area of likeness in form right angled triangle, blind area Argon Bubble air curtain barrier, i.e. bar shaped air curtain can not be formed between the containment wall of both sides
The Argon Bubble air curtain barrier of barricade Argon formation has only carried out air purge to the part molten steel in continuous casting production, removal of inclusions
Effect is made a discount；(2) the magnesia air curtain barricade wall porosity height of the disperse formula of prior art production, low intensity, not anti-erosion, punching
Brush, service life is low, it is impossible to synchronous with tundish service life of refractory material, and the production cost of the resistance to material of continuous casting is affected greatly；
And the ventilative ring filling pipe end brick cup existing defects of disperse formula or deficiency of prior art production：(1) disperse formula breathe freely ring forming in
In tundish upper nozzle brick cup body, it is set on filling pipe end, quality requirement is high, risk is big, once there are quality problems, directly
The normal cast production of influence, or even cause unplanned to stop pouring accident；(2) 90~115mm of dispersion ring height, height is big, not only into
Type is difficult, cost is high, and dispersion ring gas permeability is uneven, influences the metallurgical effect of removal of inclusions.
Chinese patent literature CN201070699Y (the patent No.s：200720151456.3) a kind of air curtain barricade wall is disclosed, have
The wall that gas permeable material is made；The wall is connected with air-feed source, it is characterised in that：The wall is annular, respectively ring
It is wound on around each mouth of a river of tundish and sets, the wall is by being molded over connecting hole and air-feed source phase thereon
Even.It is capable of molten steel complete air purge of the solution to injection of economy.The deficiency of the patented technology：Wall not anti-erosion, wash away, make
It is low with the life-span, seriously constrain tundish service life.
CN201070670Y (application number 200720151457.8) discloses a kind of air curtain barricade wall, is made with gas permeable material
Wall (41)；The wall (41) is connected with argon gas source of supply；The wall (41) is the annular with opening, the wall
(41) it is connected by the connecting hole (404) being molded over thereon with the argon gas source of supply.The air curtain barricade wall is respectively applied to certainly
The slag blocking wall (20) of tundish has several points to what leading of stretching of both sides prolonged that its direction that stretches respectively is molded on isocon (30)
Head piece (32)；The two ends (401,402) of the wall (41) abut to the isocon side of corresponding diffluence pass (32) nearby
On wall, to constitute the annular region of a closing.The deficiency of the patented technology：Wall development and production difficulty is big, cost is high, technique
Arrangement is complicated, and molten steel air purge effect is poor.
Chinese patent literature CN106041045A (the patent No.s：2016106342707) a kind of continuous casting production is disclosed more
Dissipate the ventilative ring filling pipe end brick cup of formula and its ar blowing refining method, including filling pipe end brick cup body (1), disperse formula ventilative ring (2), gas
The disperse formula that annular is evenly arranged is provided with room (3), air inlet pipe (4), filling pipe end brick cup body to breathe freely ring (2) and annular
Air chamber (3), described air chamber be located at disperse formula breathe freely ring bottom and connected with ventilative disperse formula ring of breathing freely, disperse formula is breathed freely ring
Top stretch out 5~10mm of upper surface of pocket block body (1), the sidepiece of air chamber is connected with air inlet pipe (4), the one of air inlet pipe
End is connected with air chamber, and the other end stretches out from the sidepiece of filling pipe end brick cup body (1), and connection metal tube connects with outside argon gas source of the gas
It is logical, it is blown into after argon gas, is upwardly formed ring-type air curtain barrier, air purge is carried out to the molten steel for entering filling pipe end, promotes inclusion floating
And removal, and there is a number of Argon Bubble to enter with steel stream in submersed nozzle, stable, continuous annular flow is formed,
Nozzle clogging problem is not only inhibited, and solves protectiveness Argon Bubble and enters the strand rimhole triggered in steel and ask
Topic.The deficiency of the patented technology：Ventilative ring filling pipe end brick cup substance is big, and air chamber structure is complicated, and the ventilative ring of disperse formula is highly big, into
Type is difficult, and production cost is high, and ventilative ring gas permeability is uneven, influences Argon metallurgical effect.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of annular air curtain barricade wall of continuous casting production and its molten steel air purge side
Method, invention annular air curtain barricade wall is designed with the split of tundish upper nozzle brick cup, and annular air curtain barricade wall is set in continuous casting production
On each filling pipe end brick cup, argon gas is blown into, Argon Bubble is produced, ring-type air curtain barrier is formed around filling pipe end brick cup, to entering
The whole air purges of the molten steel of tundish upper nozzle so that Argon Bubble drives inclusion floating to pouring basket liquid level by high alkalinity tundish
Coverture absorbs and effective removal in time, and improving metallographic the amount of inclusions in inclusion removal rate, stocking, application is existing on year-on-year basis
There are the patent CN201070699Y (patent No.s：200720151456.3) more than 50% is reduced, while present invention annular air curtain barricade wall
Body is produced with ventilative ring using secondary forming process, resistant to corrosion, antiscour, and service life is high, reaches 22~24 hours.
A kind of annular air curtain barricade wall of continuous casting production, including air curtain barricade wall body (1), disperse formula ventilative ring (2), air chamber
(3), air inlet pipe (4), the cross section of air curtain barricade wall body (1) is in annular, and air curtain barricade wall body is provided with installation in the middle part of (1)
The ventilative ring (2) of disperse formula is provided with hole, air curtain barricade wall body (1), air curtain barricade wall body is stretched out on the top of the ventilative ring of disperse formula
(1) upper surface, air chamber (3) takes shape in the bottom of the ventilative ring of disperse formula, and the sidepiece of air chamber (3) is connected with air inlet pipe (4), air inlet
One end of pipe is connected with air chamber, and the other end stretches out from the sidepiece of air curtain barricade wall body (1), it is characterised in that air chamber (3) is in production
Disperse formula breathe freely ring when one-shot forming, simplify production technology, reduce production cost.
It is preferred that, air inlet pipe is connected by metal tube (8) with outside argon gas source of the gas.The middle part of air curtain barricade wall body (1)
It is provided with cylindrical mounting hole.
It is currently preferred, the air curtain barricade wall body (1), using corundum pouring material moulding by casting, bulk density >=
3.0g/cm3, high temperature break resistant intensity >=12Mpa, crushing strength under high temperature >=80Mpa, AL2O3Content >=92%, Cr2O3Content >=
2.0%.
Currently preferred, the disperse formula is breathed freely ring (2), is used high-purity corundum, mullite etc. for main material, is passed through machine
Pressure mode is molded, AL2O3Content >=83%, SiO2Content≤6.0%, Cr2O3Content≤2.0%, bulk density >=2.65g/
cm3, crushing strength under high temperature >=50Mpa, apparent porosity 25~28%.
Currently preferred, the disperse formula is breathed freely ring (2), and its cross section is in a rectangular trapezoid in annular, vertical section, circle
Ring upper width b is 35~45mm, and lower width c is 40~50mm, and height h is 50~80mm.
Currently preferred, air curtain barricade wall body (1) upper surface is stretched out in the upper end of the ventilative ring (2) of the disperse formula
Height x is 5~10mm.
It is currently preferred, the air chamber (3) generally annular, the vertical section of air chamber is semicircle, and its radius R is 9
Air inlet pipe mounting hole (5) is set on~10mm, air chamber (3), and the diameter d of air inlet pipe mounting hole is 12~13mm.It is preferred that, air inlet
The diameter d of pipe mounting hole is 12mm.
Currently preferred, the absolute altitude L of the air inlet pipe (4) is 20~40mm.
Air inlet pipe (4), metal tube (8) material of the present invention is heat-resistance stainless steel pipe, wherein the rule of air inlet pipe (4)
Lattice size be M11 × 1.25 (nut inner thread, big footpath 11mm, pitch 1.25mm), metal tube (8) specification be ￠ 10 ×
2 (external diameter is 10mm, and wall thickness is 2mm).
The annular air curtain barricade wall of continuous casting production of the present invention is designed with tundish upper nozzle brick cup using split, the disperse formula
Ventilative ring (2), its cross section is in a rectangular trapezoid in annular, vertical section, and annulus upper width b is 35~45mm, lower width c
For 40~50mm, height h is the design such as 50~80mm, is that those skilled in the art studies and raw by substantial amounts of hydraulic model trial
Production application test checking is obtained, and above-mentioned design is breathed freely the production cost of ring, ventilative uniformity, the effect of cleaning molten steel to disperse formula
Fruit and avoid Argon Bubble enter crystallizer in trigger strand rimhole problem all have a direct impact, continuous casting production ring of the present invention
Shape air curtain barricade wall is designed with tundish upper nozzle brick cup using split, and disperse formula air brick and filling pipe end steel outlet hole are in larger distance,
The Argon Bubble that the ventilative ring of disperse formula is produced will not be flowed into filling pipe end with steel, substantially solve the entrance of protectiveness Argon Bubble
The strand rimhole problem triggered into steel；The height h of the ventilative ring (2) of disperse formula of the present invention is 50~80mm, than
CN106041045A (the patent No.s：2016106342707) 90~115mm of ventilative ring height is reduced, and not only increases shaping
Quality, solves the uneven technical barrier of ventilative shape, and reduce production cost.
The present invention also provides a kind of installation method of the annular air curtain barricade wall of continuous casting production, comprises the following steps：
1) tundish bag bottom permanent liner (11) open up metal tube bury groove (12), its gash depth y be 50~
70mm, width is 30~40mm, for laying metal tube (8)；
2) install, fix tundish upper nozzle (7)；
3) install, fix filling pipe end brick cup (6),
4) one layer of magnesian ramming mass of pad around filling pipe end brick cup (6), thickness z is 60~80mm, and filling pipe end brick cup (6) is outside
The thick corundum chamotte of 10~15mm is smeared on wall, the inner chamber of annular air curtain barricade wall body (1) is set in filling pipe end brick cup (6)
On so that the upper surface of annular air curtain barricade wall body (1) is concordant with the upper surface of filling pipe end brick cup (6), and air inlet pipe (4) is placed in
Metal tube in the permanent liner of bottom is wrapped to bury in groove (12)；
5) air inlet pipe (4) is docked with metal tube (8) in the embedded groove (12) of metal tube in bag bottom permanent liner, will
Metal tube (8) is close to the linea angulata of tundish permanent liner end and sidepiece, from bag along drawing, is fixedly welded on tundish bag along pressing plate
(9) on；
6) install to bury in groove (12) with metal tube in bag bottom permanent liner in melt pit (14) in filling pipe end brick cup and use
Magnesian ramming mass fills up tamping；
7) constructed liner in dundish (10) according to prior art, in containment wall permanent liner metal tube bury in groove (12) and
It is floating that bag uses magnesia coating to tamp along along pressing plate (9) scarfing, so far the annular air curtain barricade wall peace of continuous casting production of the invention
Install into, construct, toasted after liner in dundish according to prior art, you can reach the standard grade and use.
Described magnesian ramming mass, magnesia coating are conventional refractory materials, commercial products.
The present invention, to tundish molten steel air purge method, is comprised the following steps using the annular air curtain barricade wall of continuous casting production：
1) continuous casting production is dried before bag, and metal tube (8) is connected with outside argon gas source of the gas；
2) while continuous casting is unwrapped pour greatly, annular air curtain barricade wall is blown into argon gas, initial 10~15NL/min of argon flow amount,
Treat that molten steel reaches the pouring basket liquid level (15) normally poured into a mould in tundish, tunes up argon flow amount to 16~20NL/min, argon gas stream
The control of amount size is advisable with the fluctuation slightly of the pouring basket liquid level (15) of annular air curtain barricade wall body (1) area just above；
3) the big bag of continuous casting stops after pouring, and annular air curtain barricade wall stops being blown into argon gas.
NL/min, refers to the flow under 20 degrees Celsius, the status of criterion of 1 atmospheric pressure, how much liters per minute.
Beneficial effects of the present invention：
1) the annular air curtain barricade wall of continuous casting production of the present invention is designed with tundish upper nozzle brick cup using split, and disperse formula is saturating
Gas brick and filling pipe end steel outlet hole are in larger distance, and the Argon Bubble that the ventilative ring of disperse formula is produced will not be flowed into filling pipe end with steel,
Substantially solve the problems, such as that protectiveness Argon Bubble enters the strand rimhole triggered in steel.
2) the disperse formula of the annular air curtain barricade wall of the present invention breathes freely ring height h for 50~80mm, than CN106041045A (patents
Number：2016106342707) 90~115mm of ventilative ring height is reduced, and is not only increased Forming Quality, is solved ventilative shape
Uneven technical barrier, and reduce production cost.
3) one-shot forming when production disperse formula breathes freely ring of the air chamber of the annular air curtain barricade wall of the present invention, simplifies production work
Skill, reduces production cost.
4) the annular air curtain barricade wall body of the present invention uses corundum pouring material moulding by casting, the ventilative ring machine pressure mode of disperse formula
Shaping, high temperature firing process, resistant to corrosion, antiscour, service life are high, reach 22~24 hours, than applying existing patent
CN201070699Y (the patent No.s：200720151456.3) more than 1 times is improved on year-on-year basis.
5) the annular air curtain barricade wall of continuous casting production of the present invention is blown into argon gas, produces Argon Bubble, the shape around filling pipe end brick cup
Circlewise air curtain barrier, to the whole air purges of molten steel for entering tundish upper nozzle, improves metallographic in inclusion removal rate, stocking
The amount of inclusions applies the existing patent CN201070699Y (patent No.s on year-on-year basis：200720151456.3) reduce more than 50%.
The of the invention and existing patented technology Chinese patent literature CN106041045A (patent No.s：2016106342707) area
It is not characterised by, one is that the annular air curtain barricade wall of continuous casting production of the present invention is designed with tundish upper nozzle brick cup using split, more
Dissipate formula air brick and filling pipe end steel outlet hole is in larger distance, the Argon Bubble that the ventilative ring of disperse formula is produced will not flow into Shang Shui with steel
It is intraoral, substantially solve the problems, such as that protectiveness Argon Bubble enters the strand rimhole triggered in steel；Two be of the present invention
Disperse formula breathe freely ring (2) height h be 50~80mm, than the CN106041045A (patent No.s：2016106342707) ventilative ring
Highly 90~115mm is reduced, and not only increases Forming Quality, solves the uneven technical barrier of gas permeability, and reduce
Production cost；Three be air chamber of the present invention (3) one-shot forming when production disperse formula breathes freely ring, simplifies production technology, drops
Low production cost.
Brief description of the drawings
Fig. 1 is the annular air curtain barricade wall structure schematic cross-sectional view of continuous casting production in the embodiment of the present invention.
Fig. 2 is the annular air curtain barricade wall structure schematic top plan view of continuous casting production in the embodiment of the present invention.
Fig. 3 is the ventilative ring structure schematic diagram of disperse formula in the embodiment of the present invention.
Fig. 4 is the annular air curtain barricade wall scheme of installation of continuous casting production in the embodiment of the present invention.
In figure, 1, annular air curtain barricade wall body；2nd, the ventilative ring of disperse formula；3rd, air chamber；4th, air inlet pipe；5th, air inlet pipe is installed
Hole；6th, filling pipe end brick cup；7th, tundish upper nozzle；8th, metal tube；9th, wrap along pressing plate；10th, liner in dundish；11st, it is middle
Bag permanent liner；12nd, metal tube buries groove；13rd, tundish involucrum；14th, filling pipe end brick cup installs melt pit；15th, tundish liquid
Face.
Embodiment
The present invention is further described with embodiment below in conjunction with the accompanying drawings, but is not limited only to this.Part not in the detailed description of the invention,
Prior art can be used.
Embodiment 1：
A kind of annular air curtain barricade wall of continuous casting production, as shown in Figure 1, Figure 2, Figure 3, Figure 4, including air curtain barricade wall body 1, more
Formula ventilative ring 2, air chamber 3, air inlet pipe 4 are dissipated, air curtain barricade wall body 1 is in annular, and its middle part is provided with cylindrical mounting hole, air curtain
The ventilative ring 2 of disperse formula of annular is provided with barricade body 1, the upper of air curtain barricade wall body 1 is stretched out on the top of the ventilative ring of disperse formula
Surface, air chamber 3 takes shape in the bottom of the ventilative ring of disperse formula, and the sidepiece of air chamber 3 is connected with air inlet pipe 4, one end of air inlet pipe and gas
Room is connected, and the other end stretches out from the sidepiece of air curtain barricade wall body 1, and air inlet pipe connects metal tube 8 and connected with outside argon gas source of the gas,
Characterized in that, the one-shot forming when production disperse formula breathes freely ring of air chamber 3, simplifies production technology, reduces production cost.
The air curtain barricade wall body 1, using corundum pouring material moulding by casting, bulk density >=3.0g/cm3, high temperature resist
Roll over intensity >=12Mpa, crushing strength under high temperature >=80Mpa, AL2O3Content >=92%, Cr2O3Content >=2.0%.
The disperse formula is breathed freely ring 2, is used high-purity corundum, mullite etc. for main material, is molded by way of machine pressure, AL2O3
Content >=83%, SiO2Content≤6.0%, Cr2O3Content≤2.0%, bulk density >=2.65g/cm3, crushing strength under high temperature >=
50Mpa, apparent porosity 25~28%.
The disperse formula is breathed freely ring 2, and its cross section is in a rectangular trapezoid in annular, vertical section, and annulus upper width b is
45mm, lower width c are 50mm, and height h is 80mm.
The height x that the upper surface of air curtain barricade wall body 1 is stretched out in the upper end of the ventilative ring 2 of the disperse formula is 5mm.
The air chamber 3 generally annular, the vertical section of air chamber is semicircle, its radius R be set on 9mm, air chamber 3 into
Tracheae mounting hole 5, the diameter d of air inlet pipe mounting hole is 12mm.
The absolute altitude L of the air inlet pipe 4 is 40mm.
Air inlet pipe (4), metal tube (8) material of the present invention is heat-resistance stainless steel pipe, wherein the rule of air inlet pipe (4)
Lattice size be M11 × 1.25 (nut inner thread, big footpath 11mm, pitch 1.25mm), metal tube (8) specification be ￠ 10 ×
2 (external diameter is 10mm, and wall thickness is 2mm).
The installation method of the annular air curtain barricade wall of described continuous casting production, comprises the following steps：
1) open up metal tube in tundish bag bottom permanent liner 11 and bury groove 12, its gash depth y is 70mm, and width is
40mm, for laying metal tube 8；
2) installed according to prior art, fix tundish upper nozzle 7；
3) installed according to prior art, fix filling pipe end brick cup 6,
4) one layer of magnesian ramming mass of pad around filling pipe end brick cup 6, thickness z is to be smeared on 60mm, the outer wall of filling pipe end brick cup 6
Corundum chamotte thick 15mm, the inner chamber of annular air curtain barricade wall body 1 is set on filling pipe end brick cup 6 so that annular air curtain
The upper surface of barricade body 1 is concordant with the upper surface of filling pipe end brick cup 6, and air inlet pipe 4 is placed in metal tube in bag bottom permanent liner
In embedded groove 12；
5) metal tube in bag bottom permanent liner, which is buried, docks air inlet pipe 4 with metal tube 8 in groove 12, by metal
Pipe 8 is close to the linea angulata of tundish permanent liner end and sidepiece, from bag along drawing, is fixedly welded on tundish bag along along pressing plate 9；
6) install interior using magnesia with the embedded groove 12 of metal tube in bag bottom permanent liner in melt pit 14 in filling pipe end brick cup
Ramming mass fills up tamping；
7) according to prior art construction liner in dundish 10, metal tube is buried in groove 12 and bag edge in containment wall permanent liner
Floating, the so far annular air curtain barricade wall installation of continuous casting production of the invention is tamped in the scarfing of pressing plate 9 using magnesia coating,
Construct, toasted after liner in dundish according to prior art, you can reach the standard grade and use.
Described magnesian ramming mass, magnesia coating are conventional refractory materials, commercial products.
The annular air curtain barricade wall of the utilization continuous casting production comprises the following steps to tundish molten steel air purge method：
1) continuous casting production is dried before bag, and metal tube 8 is connected with outside argon gas source of the gas；
2) while continuous casting is unwrapped pour greatly, annular air curtain barricade wall is blown into argon gas, initial argon flow amount 10NL/min, in treating
Between wrap in molten steel reach the pouring basket liquid level 15 normally poured into a mould, tune up argon flow amount to 16NL/min, the control of argon flow amount size
It is advisable with the fluctuation slightly of the pouring basket liquid level 15 of the annular area just above of air curtain barricade wall body 1；
3) the big bag of continuous casting stops after pouring, and annular air curtain barricade wall stops being blown into argon gas.
Embodiment 2,
The annular air curtain barricade wall of continuous casting production as described in Example 1, difference is：
The disperse formula is breathed freely ring 2, and its cross section is in a rectangular trapezoid in annular, vertical section, and annulus upper width b is
35mm, lower width c are 40mm, and height h is 50mm.
The height x that the upper surface of air curtain barricade wall body 1 is stretched out in the upper end of the ventilative ring 2 of the disperse formula is 10mm.
The air chamber 3 generally annular, the vertical section of air chamber is semicircle, and its radius R is 10mm.Set on air chamber 3
Air inlet pipe mounting hole 5, the diameter d of air inlet pipe mounting hole is 13mm.
The absolute altitude L of the air inlet pipe 4 is 20mm.
The installation method of the annular air curtain barricade wall of described continuous casting production, comprises the following steps：
1) open up metal tube in tundish bag bottom permanent liner 11 and bury groove 12, its gash depth y is 50mm, and width is
30mm, for laying metal tube 8；
2) installed according to prior art, fix tundish upper nozzle 7；
3) installed according to prior art, fix filling pipe end brick cup 6,
4) one layer of magnesian ramming mass of pad around filling pipe end brick cup 6, thickness z is to be smeared on 80mm, the outer wall of filling pipe end brick cup 6
Corundum chamotte thick 12mm, the inner chamber of annular air curtain barricade wall body 1 is set on filling pipe end brick cup 6 so that annular air curtain
The upper surface of barricade body 1 is concordant with the upper surface of filling pipe end brick cup 6, and air inlet pipe 4 is placed in metal tube in bag bottom permanent liner
In embedded groove 12；
5) air inlet pipe 4 is docked with metal tube 8 in the embedded groove 12 of metal tube in bag bottom permanent liner, by metal tube
8 are close to the linea angulata of tundish permanent liner end and sidepiece, from bag along drawing, are fixedly welded on tundish bag along along pressing plate 9；
6) install interior using magnesia with the embedded groove 12 of metal tube in bag bottom permanent liner in melt pit 14 in filling pipe end brick cup
Ramming mass fills up tamping；
7) according to prior art construction liner in dundish 10, metal tube is buried in groove 12 and bag edge in containment wall permanent liner
Floating, the so far annular air curtain barricade wall installation of continuous casting production of the invention is tamped in the scarfing of pressing plate 9 using magnesia coating,
Construct, toasted after liner in dundish according to prior art, you can reach the standard grade and use.
One kind, to tundish molten steel air purge method, is comprised the following steps using the annular air curtain barricade wall of continuous casting production：
1) continuous casting production is dried before bag, and metal tube 8 is connected with outside argon gas source of the gas；
2) while continuous casting is unwrapped pour greatly, annular air curtain barricade wall is blown into argon gas, initial argon flow amount 15NL/min, in treating
Between wrap in molten steel reach the pouring basket liquid level 15 normally poured into a mould, tune up argon flow amount to 20NL/min, the control of argon flow amount size
It is advisable with the fluctuation slightly of the pouring basket liquid level 15 of the annular area just above of air curtain barricade wall body 1；
3) the big bag of continuous casting stops after pouring, and annular air curtain barricade wall stops being blown into argon gas.
Embodiment 3,
The disperse formula is breathed freely ring 2, and its cross section is in a rectangular trapezoid in annular, vertical section, and annulus upper width b is
40mm, lower width c are 45mm, and height h is 70mm.
The height x that the upper surface of air curtain barricade wall body 1 is stretched out in the upper end of the ventilative ring 2 of the disperse formula is 7mm.
The air chamber 3 generally annular, the vertical section of air chamber is semicircle, and its radius R is 9.5mm.Set on air chamber 3
Air inlet pipe mounting hole 5, the diameter d of air inlet pipe mounting hole is 12mm.
The absolute altitude L of the air inlet pipe 4 is 30mm.
The annular air curtain barricade wall of the utilization continuous casting production comprises the following steps to tundish molten steel air purge method：
1) continuous casting production is dried before bag, and metal tube is connected with outside argon gas source of the gas；
2) while continuous casting is unwrapped pour greatly, annular air curtain barricade wall is blown into argon gas, initial argon flow amount 12NL/min, in treating
Between wrap in molten steel reach the pouring basket liquid level 15 normally poured into a mould, tune up argon flow amount 18NL/min, the control of argon flow amount size with
The fluctuation slightly of the pouring basket liquid level 15 of the annular area just above of air curtain barricade wall body 1 is advisable；
3) the big bag of continuous casting stops after pouring, and annular air curtain barricade wall stops being blown into argon gas.
Comparative example 1：Chinese patent literature CN201070699Y (the patent No.s：200720151456.3) a kind of air curtain gear is disclosed
Wall, argon flow amount 6L/min.
By embodiment 1-3 and comparative example 1, in the 4# slab casters cast life of Laiwu steel enterprise Yin Shan shaped steel Co., Ltd
High-strength steel Q550D is produced, and takes stocking metallographic phase sample, size is 20 × 15 × 15mm, carries out metallographic and is mingled with analyte detection and comparative analysis.
The annular air curtain barricade wall resistant to corrosion of the tundish of the present invention, antiscour, service life can be with tundish upper nozzle, stopper, immersion
The formula mouth of a river keeps synchronous, reaches 22~24 hours, and more than 1 times, metallographic the amount of inclusions ratio in stocking are improved on year-on-year basis than comparative example 1
Comparative example 1 reduces more than 50% on year-on-year basis.Comparing result is shown in Table 1.
Table 1
Claims (10)
1. a kind of annular air curtain barricade wall of continuous casting production, including air curtain barricade wall body (1), disperse formula breathe freely ring (2), air chamber (3),
Air inlet pipe (4), it is characterised in that the cross section of air curtain barricade wall body (1) is in annular, air curtain barricade wall body is set in the middle part of (1)
It is equipped with mounting hole, air curtain barricade wall body (1) and is provided with the ventilative ring (2) of disperse formula, air curtain is stretched out on the top of the ventilative ring of disperse formula
The upper surface of barricade body (1), air chamber (3) takes shape in the bottom of the ventilative ring of disperse formula, and the sidepiece of air chamber (3) is connected with air inlet pipe
(4), one end of air inlet pipe is connected with air chamber, and the other end stretches out from the sidepiece of air curtain barricade wall body (1), and air chamber (3) is being produced more
Dissipate formula breathe freely ring when one-shot forming.
2. the annular air curtain barricade wall of continuous casting production as claimed in claim 1, it is characterised in that air inlet pipe passes through metal tube
(8) connected with outside argon gas source of the gas.
3. the annular air curtain barricade wall of continuous casting production as claimed in claim 1 or 2, it is characterised in that air curtain barricade wall body (1)
Middle part is provided with cylindrical mounting hole.
4. the annular air curtain barricade wall of continuous casting production as claimed in claim 1 or 2, it is characterised in that the air curtain barricade wall body
(1), using corundum pouring material moulding by casting, bulk density >=3.0g/cm3, high temperature break resistant intensity >=12Mpa, high-temperature pressure-proof
Intensity >=80Mpa, AL2O3Content >=92%, Cr2O3Content >=2.0%；
The disperse formula is breathed freely ring (2), is used high-purity corundum, mullite etc. for main material, is molded by way of machine pressure, AL2O3Contain
Measure >=83%, SiO2Content≤6.0%, Cr2O3Content≤2.0%, bulk density >=2.65g/cm3, crushing strength under high temperature >=
50Mpa, apparent porosity 25~28%.
5. the annular air curtain barricade wall of continuous casting production as described in any one of Claims 1 to 4, it is characterised in that the disperse formula
Ventilative ring (2), its cross section is in a rectangular trapezoid in annular, vertical section, and annulus upper width b is 35~45mm, lower width c
For 40~50mm, height h is 50~80mm.
6. the annular air curtain barricade wall of continuous casting production as described in any one of Claims 1 to 5, it is characterised in that the disperse formula
The height x that air curtain barricade wall body (1) upper surface is stretched out in the upper end of ventilative ring (2) is 5~10mm.
7. the annular air curtain barricade wall of continuous casting production as described in any one of claim 1~6, it is characterised in that the air chamber (3)
Generally annular, the vertical section of air chamber is semicircle, and its radius R is that air inlet pipe mounting hole is set on 9~10mm, air chamber (3)
(5), the diameter d of mounting hole is 12~13mm.
8. the annular air curtain barricade wall of continuous casting production as described in any one of claim 1~7, it is characterised in that the air inlet pipe
(4) absolute altitude L is 20~40mm.
9. a kind of installation method of the annular air curtain barricade wall of continuous casting production, comprises the following steps：
1) open up metal tube in tundish bag bottom permanent liner (11) and bury groove (12), its gash depth y is 50~70mm, wide
Spend for 30~40mm, for laying metal tube (8)；
2) install, fix tundish upper nozzle (7)；
3) install, fix filling pipe end brick cup (6),
4) one layer of magnesian ramming mass of pad around filling pipe end brick cup (6), thickness z is on 60~80mm, filling pipe end brick cup (6) outer wall
The thick corundum chamotte of 10~15mm is smeared, the inner chamber of annular air curtain barricade wall body (1) is set on filling pipe end brick cup (6),
So that the upper surface of annular air curtain barricade wall body (1) is concordant with the upper surface of filling pipe end brick cup (6), and air inlet pipe (4) is placed in bag
Metal tube is buried in groove (12) in the permanent liner of bottom；
5) metal tube in bag bottom permanent liner, which is buried, docks air inlet pipe (4) with metal tube (8) in groove (12), by gold
Category pipe (8) is close to the linea angulata of tundish permanent liner end and sidepiece, from bag along drawing, is fixedly welded on tundish bag along pressing plate
(9) on；
6) install interior using magnesia with the embedded groove (12) of metal tube in bag bottom permanent liner in melt pit (14) in filling pipe end brick cup
Ramming mass fills up tamping；
7) according to prior art construction liner in dundish (10), metal tube is buried in groove (12) and bag edge in containment wall permanent liner
Magnesia coating is used to tamp in pressing plate (9) scarfing floating, so far the annular air curtain barricade wall of continuous casting production of the invention is installed
Into constructing, toasted after liner in dundish according to prior art, you can reach the standard grade and use.
10. one kind, to tundish molten steel air purge method, is comprised the following steps using the annular air curtain barricade wall of continuous casting production：
1) continuous casting production is dried before bag, and metal tube (8) is connected with outside argon gas source of the gas；
2) while continuous casting is unwrapped pour greatly, annular air curtain barricade wall is blown into argon gas, initial 10~15NL/min of argon flow amount, in treating
Between wrap in molten steel reach the pouring basket liquid level (15) normally poured into a mould, tune up argon flow amount to 16~20NL/min, argon flow amount is big
Small control is advisable with the fluctuation slightly of the pouring basket liquid level (15) of annular air curtain barricade wall body (1) area just above；
3) the big bag of continuous casting stops after pouring, and annular air curtain barricade wall stops being blown into argon gas.
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| CN108500252A (en) * | 2018-04-09 | 2018-09-07 | 东北大学 | A kind of tundish bottom with cover is breathed freely ring and its method that controls tundish slag |
| CN109732074A (en) * | 2019-02-20 | 2019-05-10 | 山东钢铁股份有限公司 | A kind of ladle dispersion ring ventilating filling pipe end brick cup and its Argon metallurgical method |
| CN109759575A (en) * | 2019-02-20 | 2019-05-17 | 山东钢铁股份有限公司 | A kind of annular air curtain barricade wall and its Argon metallurgical method for ladle |
| CN114472818A (en) * | 2021-12-27 | 2022-05-13 | 东北大学 | Device for effectively removing impurities by blowing at bottom of cyclone chamber and using method |
| CN115213387A (en) * | 2021-04-15 | 2022-10-21 | 宝山钢铁股份有限公司 | Continuous casting tundish and preparation method thereof |
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| CN109732074B (en) * | 2019-02-20 | 2023-08-25 | 山东钢铁股份有限公司 | Ladle dispersion ring ventilation upper nozzle pocket brick and argon blowing metallurgical method thereof |
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| CN115213387A (en) * | 2021-04-15 | 2022-10-21 | 宝山钢铁股份有限公司 | Continuous casting tundish and preparation method thereof |
| CN114472818A (en) * | 2021-12-27 | 2022-05-13 | 东北大学 | Device for effectively removing impurities by blowing at bottom of cyclone chamber and using method |
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