CN108176844A - A kind of device and method for clearing up tundish upper nozzle dross object - Google Patents
A kind of device and method for clearing up tundish upper nozzle dross object Download PDFInfo
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- CN108176844A CN108176844A CN201810034512.8A CN201810034512A CN108176844A CN 108176844 A CN108176844 A CN 108176844A CN 201810034512 A CN201810034512 A CN 201810034512A CN 108176844 A CN108176844 A CN 108176844A
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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
- B22D41/52—Manufacturing or repairing thereof
- B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor
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Abstract
The invention belongs to technical field of ferrous metallurgy, in particular it relates to a kind of device and method for clearing up tundish upper nozzle dross object.In casting process, when there is tundish upper nozzle dross phenomenon, turn the opening degree of stopper down, pulling rate is reduced to the 20%~30% of normal pulling rate, then the round steel bar of one section of calcic core is inserted into from hollow stopper to tundish upper nozzle, molten steel melts away the box hat at concave point or concave, occurs pothole or gap on the circumferential surface of round steel bar, calcium core inside round steel bar, which is heated, becomes gaseous state, and gaseous calcium is ejected to the Al in tundish upper nozzle at pothole or gap2O3At dross object, Ca and Al2O3Dross object reacts.Clear up Al2O3The time of dross object is only 1~5 minute, pours the secondary time much smaller than continuous casting is replaced, is conducive to the promotion of continuous casting yield；Caused by production loss much smaller than replace tundish caused by loss.Stopper will not be corroded, the service life of stopper will not be reduced.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, in particular it relates to a kind of cleaning tundish upper nozzle knot
The device and method of effluent.
Background technology
Continuous casting is important procedure in metallurgical production process, and the mouth of a river is as connection tundish and the important fire proofed wood of crystallizer
Material, is referred to as " neck " of continuous casting, has the function of to form a connecting link, be to ensure that the important link of continuous casting stable operation.Steel plant
In casting process, often there is dross and cause nozzle blocking in middle water containing opening and submersed nozzle, influence continuous casting cast and
Slab quality.With the improvement of continuous casting process and the exploitation of refractory material, the service life at the mouth of a river is obviously improved, still,
A1 can occur in casting cycle2O3And the other element dross phenomenons in part, especially blocked when casting Al killed steel, steel containing Al
Phenomenon is very serious, annoyings continuous casting working procedure always.Nozzle clogging or blocking not only reduce the production efficiency of conticaster, influence whole
A casting process, and be one of the main reason for causing steel products defect.
Nippon is installing core plate additional made of insulating materials in submersed nozzle ontology, and before cast, core plate is led to
Electrical heating improves mouth of a river inner wall temperature, so as to avoid the Al caused by steel contacts mouth of a river inner wall temperature drastically declines2O3Adherency.
Sumitomo Metal Industries develop the technology for molten steel being made to generate vortex using tundish protrusion, and the steady flowing of molten steel effectively presses down
The aggregation of nozzle blocking object is made.Japanese kobe steel is developed a kind of with air-cooled and electromagnetic mixing apparatus novel immersion
The mouth of a river is machined with the ring-shaped groove of 10mm depths on the outer wall of the mouth of a river to increase cooling surface product, can realize overall process low overheat
Cast, avoids nozzle blocking.Weirton steel plant of the U.S. have carried out mass production experiment and have mitigated Submerged Nozzle Clogging Course, take
The measures such as molding casting can reduce the generation of field trash, so as to improve Cleanliness of Molten Steel.
To meet the needs of high pulling rate sheet blank continuous casting, Tian Naiyuan etc. ([University of Science ＆ Technology, Beijing's journal] 2002,24 (03)：
262~265《New Subermerged Entry Nozzle in Thin Slab Caster》) a kind of four side opening mouths of a river for being referred to as dissipative type are developed, it reduces
The impact depth of molten steel and field trash, is conducive to the floating of field trash, can play to a certain extent prevents nozzle blocking
Effect.([this steel technology] 1997 (5) such as Zhao Guangrong:49~53《New Subermerged Entry Nozzle in Thin Slab Caster》) think rationally to set
Meter mouth of a river inner-cavity structure is conducive to improve the blocking of mouth of a river inner cavity, traditional straight cavate mouth of a river inner-cavity structure steel in drainage process
It is big that water and mouth of a river inner wall are in direct contact area, A12O3It waits field trashes sticking probability also big, is modified to stepped annular formula inner cavity
The mouth of a river and bicyclic step type water gap, alleviate A12O3Wait field trashes adherency.([Yunnan metallurgy] 1997,26 (3) such as Chen Chongfeng:39
~42《Prevent tundish from blocking new technology》) study and think when surface roughness is more than 0.3mm, the viscous portion in molten steel boundary layer
Divide failure, the protective effect of viscous layer disappears, the Al in steel2O3Field trashes is waited to be easy to be enriched with, therefore mouth of a river working face should be as far as possible
It is smooth.([Jiangsu is metallurgical] 2003,31 (4) such as Su Long:14~15《The discussion that submersed nozzle shape influences slab quality》)
It studies and thinks from material, put forth effort to develop nonmetal oxides material, ZrO-CaO-C materials, the low carbon materials (carbon such as ZrB2, BN<
5%), without silicon Al2O3The mouth of a river of the materials such as C-material and C and Si free materials, input practice have certain anti-clogging effect.
What current various methods were mainly studied is how to improve gate structure, how to prevent and mitigate nozzle clogging, and right
The dross mouth of a river considers considerably less, does not solve the problems, such as that nozzle clogging blocks fundamentally.
Aluminum killed steel nozzle clogging substance can be roughly divided into 4 classes：Alumina type, calcium aluminate type, calcium sulfide type and spinelle
Type.But it is substantially primarily due to dystectic aluminium oxide and a small amount of salic large polymer is gathered in mouth of a river surface
Caused, Al in molten steel2O3Field trash constantly deposits on mouth of a river surface, and by initial dotted and graininess, gradually aggregation is tied
It closes, is finally sintered slabbing, while increasingly finer and close inside dross object, MOLTEN STEEL FLOW is more and more difficult, when stopper bar position is to most
When high level still cannot meet steel -passing amount requirement, it is necessary to replace the mouth of a river, but since tundish upper nozzle is to be embedded in tundish packet
In lining, be installed in tundish building process in, tundish upper nozzle can not be replaced in casting process online, so
If due to Al2O3Field trash is deposited on that nozzle clogging caused by tundish upper nozzle then needs to stop pouring or heat changes tundish, stops
It opens to pour again again after pouring and about needs 1~2 hour, be unfavorable for the Effec-tive Function of continuous casting, the expense for replacing 1 tundish is about 2~3
Wan Yuan can cause the rising of production cost.
Calcium treatment is dystectic Al2O3Field trash is transformed into the 12CaO7Al of low melting point2O3Field trash, 12CaO (s)+
7Al2O3(s)=12CaO7Al2O3(l), after Calcium treatment, inclusion content in melting steel will be controlled in suitable fusing point.Calcium treatment is not
Foot, inclusion melting point is excessively high, easily causes nozzle blocking, and Calcium treatment is excessive, and inclusion melting point is low, liquefaction and nodularization, but stopper,
The mouth of a river is easily corroded, and calcium corrodes mouth of a river matrix in steel, mouth of a river inner wall coarse, and easily precipitation is adhered in the mouth of a river high-melting-point field trash
On wall, dross is caused.
After refining procedure carries out Calcium treatment to molten steel, in subsequent casting process, influenced by secondary oxidation, in molten steel
Calcium content can continuously decrease, and calcium treatment effect weakens, and even if w (Ca)/w (Al after Calcium treatments) and w (Ca)/w (Alin)
Value control within zone of reasonableness, but if field trash absolute magnitude is big, pourability of molten steel is still poor, easily causes mouth of a river knot
Knurl problem.The casting sequence of steel mill of country production Ultra-low carbon aluminum killed steel (C≤0.005%) is respectively less than 10 stoves at present.
So although Calcium treatment can alleviate nozzle clogging phenomenon, field trash absolute magnitude is big or Calcium treatment misoperation
In the case of or nozzle clogging phenomenon can be caused.
Invention content
To solve problem above, the present invention for the tundish upper nozzle of dross, provide it is a kind of from hollow stopper to
Middle water containing opening is inserted into the rod iron of calcic core to solve the problems, such as the method for tundish upper nozzle dross.
In casting process, when there is tundish upper nozzle dross phenomenon, the opening degree of stopper is turned down, reduce pulling rate to just
Then the 20%~30% of normal pulling rate is inserted into the round steel bar of one section of calcic core from hollow stopper to tundish upper nozzle, described to contain
Ca containing simple substance inside the round steel bar of calcium core, outside are one layer of steel pipe, and the bottom and top of steel pipe seal, steel pipe
Circumferential surface gather concave point or concave.Molten steel melts away the box hat at concave point or concave, occurs on the circumferential surface of round steel bar
Pothole or gap, the calcium core inside round steel bar, which is heated, becomes gaseous state (boiling point of calcium is 1484 DEG C, less than liquid steel temperature), gaseous calcium
The Al being ejected at pothole or gap in tundish upper nozzle2O3At dross object, Ca and Al2O3Following reaction occurs for dross object：
12Ca(g)+11Al2O3(s)=8Al (l)+12CaO7Al2O3(l),
Ca and Al2O3The 12CaO7Al of reaction generation low melting point2O3, 12CaO7Al2O3Fusing point be about 1400 DEG C,
It is liquid under molten steel temperature, is flowed into crystallizer with steel stream, the 12CaO7Al of generation2O3Field trash has slab quality larger
It influences, gets rid of base processing, the strand that this period for clearing up tundish upper nozzle dross object, interior crystallizer was produced is cut off.
A kind of device for clearing up Al2O3 dross objects at tundish upper nozzle of present invention offer, the round steel bar including calcic core,
Fire proofed wood charge bar, hollow stopper, horizontal clamper and vertical lift frame；Vertical lift frame is connected with horizontal clamper, by hanging down
Straight crane can control the vertical displacement movement of horizontal clamper, and horizontal clamper is connected with the upper end of fire proofed wood charge bar, passes through
Horizontal clamper can fix fire proofed wood charge bar, and fire proofed wood charge bar is driven to do vertical up-or-down movement, the outer diameter of fire proofed wood charge bar with
The outer diameter of the round steel bar of calcic core is identical, and the lower end of fire proofed wood charge bar is connected with the round steel bar of calcic core, fire proofed wood charge bar and calcium
The axis of the round steel bar of core is identical, can be by fire proofed wood charge bar and the round steel of calcic core by the oscilaltion campaign for being vertically moved up or down frame
Stick is inserted into hollow stopper or is extracted out of hollow stopper.
Preferably, the length of the round steel bar of calcic core is identical with the length of tundish upper nozzle, and 50 are contained inside round steel bar
~300g calcium, outside are one layer of steel pipe, and the wall thickness of steel pipe is 5~20mm, and the bottom and top of steel pipe seal,
The circumferential surface of steel pipe gathers concave point or concave, and the depth of concave point or concave is 4~19mm.
Preferably, the hollow stopper is elongated cylindrical structure, and the cooperation round steel bar that is internally provided with of hollow stopper is inserted into
Hollow tube, hollow stopper upper end is fixed with horizontal clamper.
Preferably, the horizontal clamper is made of the horizontal clamper of stopper and the horizontal clamper of fire proofed wood charge bar, plug
The horizontal clamper one end of stick is connected with vertical lift frame, and the other end is folded with hollow stopper and held；The horizontal clamper of fire proofed wood charge bar,
One end is connected with vertical lift frame, and the other end is folded with fire proofed wood charge bar and held.
Preferably, the vertical lift frame is made of lifting pipe and fixed plate, and lifting pipe is connected with horizontal clamper, Gu
Fixed board is fixed on tundish side wall, and the height of clamper is adjusted by being vertically moved up or down frame.
The present invention also provides Al at a kind of processing tundish upper nozzle2O3The method of dross object, includes the following steps：
A) judge that dross phenomenon occurs for tundish upper nozzle：
In the case where pulling speed of continuous casting significantly reduces and replaces and can not also improve pulling rate after crystallizer invasive nozzle, this
When be judged as having occurred tundish upper nozzle dross phenomenon occur,
B) round steel bar of calcic core is inserted into tundish upper nozzle：
Pulling rate is reduced at this time is inserted into tundish upper nozzle to the 20%~30% of normal pulling rate, and by the round steel bar of calcic core
Interior, the upper end of the round steel bar of calcic core is connect with fire proofed wood charge bar, and the upper end of fire proofed wood charge bar is fixed on horizontal clamper, is adjusted
Section vertical lift frame, makes the round steel bar of calcium core be in tundish upper nozzle；
C) Ca steams cleaning Al2O3Dross object：
The round steel bar of calcic core is in high-temperature molten steel environment after about 5~15 seconds, and molten steel can burn round steel bar circumference table
The box hat at concave point or concave that face is gathered, occurs pothole or gap on the circumference of round steel bar, and the calcium core inside round steel bar is heated
Become gaseous state, gaseous calcium is ejected to the Al in tundish upper nozzle at pothole or gap2O3At dross object, Ca and Al2O3Dross
Object, which reacts, generates 12CaO7Al2O3, by Al2O3Dross object cleans up.
D) fire proofed wood charge bar is extracted：
The round steel bar of calcic core is inserted into molten steel and can all be melted by molten steel after 50~200 seconds, promotes vertical lift frame at this time,
Fire proofed wood charge bar is extracted from molten steel.
E pulling rate) is promoted：
By the Al in tundish upper nozzle2O3After dross object dross object is cleaned out, slowly improve pulling speed of continuous casting and drawn to normal
Speed.
F unqualified strand) is cut off：
At strand scale position, the casting that this period, interior crystallizer was produced of tundish upper nozzle dross object will be cleared up
The method excision of base gas flame cuttiug.
Ca and Al2O3The 12CaO7Al of reaction generation low melting point2O3, 12CaO7Al2O3, fusing point be about 1400 DEG C,
It is liquid under molten steel temperature, the 12CaO7Al of generation2O3Field trash with steel stream flow into crystallizer in, have to slab quality compared with
It is big to influence, base processing is got rid of, at strand scale position, interior crystallizer this period of tundish upper nozzle dross object will be cleared up
The method excision for the strand gas flame cuttiug produced.
Advantages of the present invention
1) present invention proposes a kind of Al cleared up in the tundish upper nozzle of dross2O3The method of dross object, cleaning knot
Al after beam2O3Dross object becomes liquid 12CaO7Al2O3It is mingled with and flows into crystallizer, pulling speed of continuous casting can be promoted to normal pulling rate
Range, tundish can continue to pour into a mould.Clear up Al2O3The time of dross object is only 1~5 minute, much smaller than replace that continuous casting pours time when
Between, be conducive to the promotion of continuous casting yield；Clear up Al2O3The weight of the unqualified strand generated in the dross object time is only 0.5~
2.5 tons, caused by production loss much smaller than replace tundish caused by loss.
2) in the case of the 20%~30% of reduction Casting speed to normal pulling rate, the molten steel stream at tundish upper nozzle
Dynamic speed is still very fast, and speed reaches 0.1~0.3 meter per second, and under the drive of the molten steel quickly flowed, unreacted Ca is with steel
Stream enters in crystallizer, and Ca will not corrode stopper, will not reduce the service life of stopper.
Description of the drawings
Fig. 1, a kind of device usage state diagram for solving the problems, such as tundish upper nozzle dross.
The round steel bar configuration state figure of Fig. 2, calcic core.
The round steel bar sectional view of Fig. 3, calcic core.
Wherein：1 is molten steel；2 be crystallizer；3 be invasive nozzle；4 be the round steel bar of calcic core；5 be water on tundish
Mouthful；6 be fire proofed wood charge bar；7 be tundish；8 be hollow stopper；9 be first level clamper；10 be the second horizontal clamper；
11 be lifting pipe；12 be fixed plate；41 be concave point or concave；42 be steel pipe；43 be calcium core.
Specific embodiment：
Following embodiment is the further explanation to the present invention, but the present invention is not limited thereto.
The dross of tundish upper nozzle is solved the problems, such as using equipment as shown in Figure 1, Figure 2, Figure 3 shows, is cleared up on tundish
The device of Al2O3 drosses object is mainly by the round steel bar 4 of calcic core, fire proofed wood charge bar 6, hollow stopper 8, horizontal clamper at the mouth of a river
With vertical lift frame composition.Vertical lift frame is connected with horizontal clamper, and horizontal clamper is can control by being vertically moved up or down frame
Vertical displacement movement, horizontal clamper are connected with the upper end of fire proofed wood charge bar, and fire proofed wood charge bar can be fixed by horizontal clamper,
And fire proofed wood charge bar is driven to do vertical up-or-down movement, the outer diameter of fire proofed wood charge bar is identical with the outer diameter of the round steel bar of calcic core, resistance to
The lower end of fiery material bar is connected with the round steel bar of calcic core, and fire proofed wood charge bar is identical with the axis of the round steel bar of calcium core, by hanging down
The oscilaltion campaign of straight crane can will be in the hollow stopper of the round steel bar of fire proofed wood charge bar and calcic core insertion or from hollow plug
It is extracted in stick.
a:The length of the round steel bar 4 of calcic core is identical with the length of tundish upper nozzle 5, is containing weight inside round steel bar
50~300g calcium core 43, one layer of steel pipe 42 is in outside, and the wall thickness of steel pipe 42 is 5~20mm, the bottom of steel pipe 42
Portion and top sealing, the circumferential surface of steel pipe 42 gather concave point or concave 41, and the depth of concave point or concave is 4~19mm.
b:Fire proofed wood charge bar 6 is inserted into hollow stopper 8, and the outer diameter of fire proofed wood charge bar 6 is identical with the outer diameter of round steel bar 4, resistance to
The upper end of fiery material bar 6 is fixed with first level clamper 9, and lower end is connected with the round steel bar 4 of calcic core.
C. the hollow stopper 8 is elongated cylindrical structure, and hollow stopper 8 is internally provided with what cooperation round steel bar 4 was inserted into
Hollow tube, hollow 8 upper end of stopper are fixed with the second horizontal clamper 10；
D. the vertical lift frame is made of lifting pipe 11 and fixed plate 12, lifting pipe 11 and first level clamper 9,
Second horizontal clamper 10 is connected, and fixed plate 12 is fixed on the side wall of tundish 7, and first level is adjusted by being vertically moved up or down frame
The height of 9 and second horizontal clamper 10 of clamper.
In the case where pulling speed of continuous casting significantly reduces and replaces and can not also improve pulling rate after crystallizer invasive nozzle, this
When be judged as having occurred tundish upper nozzle dross phenomenon occur, take at this time in following operating procedure cleaning tundish upper nozzle
Dross object：
The round steel bar 4 of calcic core is inserted into tundish upper nozzle by A：Reduce pulling speed of continuous casting to normal pulling rate 20%~
30%, and the round steel bar 4 of calcic core is inserted into tundish upper nozzle 5, upper end and the fire proofed wood charge bar of the round steel bar 4 of calcic core
6 connections, the upper end of fire proofed wood charge bar 6 are fixed on first level clamper 9, adjusting vertical lifting frame, make the round steel bar 4 of calcium core
In tundish upper nozzle 5
B.Ca steams clear up Al2O3Dross object：The round steel bar 4 of calcic core is in the hot environment of molten steel 1 about 10 seconds
Afterwards, molten steel 1 can burn the box hat at concave point or concave 41 that 4 circumferential surface of round steel bar gathers, occur on the circumference of round steel bar recessed
Hole or gap, calcium core 43 inside round steel bar 4 is heated to become gaseous state, and gaseous calcium is ejected to water on tundish at pothole or gap
Al in mouth 52O3At dross object, Ca and Al2O3Dross object, which reacts, generates 12CaO7Al2O3, by Al2O3Dross object is cleared up
Fall.
C. fire proofed wood charge bar 6 is extracted：The round steel bar 4 of calcic core was inserted into molten steel 1 after 50~200 seconds can be complete by molten steel 1
Portion is melted, and promotes vertical lift frame at this time, fire proofed wood charge bar 6 is extracted from molten steel 1.
D:Promote pulling rate：By the Al in tundish upper nozzle 52O3After dross object dross object is cleaned out, continuous casting is slowly improved
Pulling rate is to normal pulling rate.
E:Cut off unqualified strand：Ca and Al2O3The 12CaO7Al of reaction generation low melting point2O3, 12CaO7Al2O3,
Fusing point be about 1400 DEG C, for liquid under molten steel temperature, the 12CaO7Al of generation2O3Field trash flows into crystallizer 2 with steel stream
It is interior, there is larger impact to slab quality, get rid of base processing, at the position of strand scale, 5 dross of tundish upper nozzle will be cleared up
The method excision for the strand gas flame cuttiug that this period of object, interior crystallizer was produced.
Embodiment 1：
Below citing and adapting device schematic diagram 1, a kind of 2,3 pairs of methods for solving the problems, such as tundish upper nozzle dross do into
One step explanation.
The big inclusion quantity of continuous casting is：50 tons, continuous casting installation for casting is：Rectangle blank continuous caster, three machines three flow, casting blank specification 180mm
×220mm。
Clear up tundish upper nozzle at Al2O3 dross objects device mainly by the round steel bar 4 of calcic core, fire proofed wood charge bar 6,
Hollow stopper 8, horizontal clamper and vertical lift frame composition.Vertical lift frame is connected with horizontal clamper, passes through vertical lift
Frame can control the vertical displacement movement of horizontal clamper, and horizontal clamper is connected with the upper end of fire proofed wood charge bar, be pressed from both sides by level
Holder can fix fire proofed wood charge bar, and fire proofed wood charge bar is driven to do vertical up-or-down movement, outer diameter and the calcic core of fire proofed wood charge bar
Round steel bar outer diameter it is identical, the lower end of fire proofed wood charge bar is connected with the round steel bar of calcic core, the circle of fire proofed wood charge bar and calcium core
The axis of rod iron is identical, can be inserted into the round steel bar of fire proofed wood charge bar and calcic core by the oscilaltion campaign for being vertically moved up or down frame
It extracts in hollow stopper or out of hollow stopper.
a:The length of the round steel bar 4 of calcic core is identical with the length of tundish upper nozzle 5, is containing weight inside round steel bar
50g calcium core 43, outside are one layer of steel pipe 42, and the wall thickness of steel pipe 42 is 5mm, and the bottom and top of steel pipe 42 are close
Envelope, the circumferential surface of steel pipe 42 gather concave point or concave 41, and the depth of concave point or concave is 4mm.
b:Fire proofed wood charge bar 6 is inserted into hollow stopper 8, and the outer diameter of fire proofed wood charge bar 6 is identical with the outer diameter of round steel bar 4, resistance to
The upper end of fiery material bar 6 is fixed with first level clamper 9, and lower end is connected with the round steel bar 4 of calcic core.
C. the hollow stopper 8 is elongated cylindrical structure, and hollow stopper 8 is internally provided with what cooperation round steel bar 4 was inserted into
Hollow tube, hollow 8 upper end of stopper are fixed with the second horizontal clamper 10；
D. the vertical lift frame is made of lifting pipe 11 and fixed plate 12, lifting pipe 11 and first level clamper 9,
Second horizontal clamper 10 is connected, and fixed plate 12 is fixed on the side wall of tundish 7, and first level is adjusted by being vertically moved up or down frame
The height of 9 and second horizontal clamper 10 of clamper.
In the case where pulling speed of continuous casting significantly reduces and replaces and can not also improve pulling rate after crystallizer invasive nozzle, this
When be judged as having occurred tundish upper nozzle dross phenomenon occur, take at this time in following operating procedure cleaning tundish upper nozzle
Dross object：
The round steel bar 4 of calcic core is inserted into tundish upper nozzle by A：Pulling speed of continuous casting is reduced to the 20% of normal pulling rate, and
The round steel bar 4 of calcic core to be inserted into tundish upper nozzle 5, the upper end of the round steel bar 4 of calcic core is connect with fire proofed wood charge bar 6,
The upper end of fire proofed wood charge bar 6 is fixed on first level clamper 9, adjusting vertical lifting frame, is made during the round steel bar 4 of calcium core is in
Between wrap in the mouth of a river 5
B.Ca steams clear up Al2O3Dross object：The round steel bar 4 of calcic core is in the hot environment of molten steel 1 about 10 seconds
Afterwards, molten steel 1 can burn the box hat at concave point or concave 41 that 4 circumferential surface of round steel bar gathers, occur on the circumference of round steel bar recessed
Hole or gap, calcium core 43 inside round steel bar 4 is heated to become gaseous state, and gaseous calcium is ejected to water on tundish at pothole or gap
Al in mouth 52O3At dross object, Ca and Al2O3Dross object, which reacts, generates 12CaO7Al2O3, by Al2O3Dross object is cleared up
Fall.
C. fire proofed wood charge bar 6 is extracted：The round steel bar 4 of calcic core was inserted into molten steel 1 after 50 seconds can be all molten by molten steel 1
Change, promote vertical lift frame at this time, fire proofed wood charge bar 6 is extracted from molten steel 1.
D:Promote pulling rate：By the Al in tundish upper nozzle 52O3After dross object dross object is cleaned out, continuous casting is slowly improved
Pulling rate is to normal pulling rate.
E:Cut off unqualified strand：Ca and Al2O3The 12CaO7Al of reaction generation low melting point2O3, 12CaO7Al2O3,
Fusing point be about 1400 DEG C, for liquid under molten steel temperature, the 12CaO7Al of generation2O3Field trash flows into crystallizer 2 with steel stream
It is interior, there is larger impact to slab quality, get rid of base processing, at the position of strand scale, 5 dross of tundish upper nozzle will be cleared up
The method excision for the strand gas flame cuttiug that this period of object, interior crystallizer was produced.
Clear up Al2O3The time of dross object is only 1 minute, pours the secondary time much smaller than continuous casting is replaced, is conducive to continuous casting yield
Promotion；Clear up Al2O3The weight of the unqualified strand generated in the dross object time is only 0.5 ton, caused by production loss it is far small
Loss caused by tundish is replaced.
In the case of the 20% of reduction Casting speed to normal pulling rate, the molten steel flow speed at tundish upper nozzle 5
Still very fast, speed reaches 0.1~0.3 meter per second, and under the drive of the molten steel quickly flowed, unreacted Ca enters with steel stream
In crystallizer 2, Ca will not corrode stopper, will not reduce the service life of stopper.
Embodiment 2
Below citing and adapting device schematic diagram 1, a kind of 2,3 pairs of methods for solving the problems, such as tundish upper nozzle dross do into
One step explanation.
The big inclusion quantity of continuous casting is：120 tons, continuous casting installation for casting is：Heavy slab billet continuous casting machine, a machine are first-class, casting blank specification is
250mm×2200mm。
Clear up tundish upper nozzle at Al2O3 dross objects device mainly by the round steel bar 4 of calcic core, fire proofed wood charge bar 6,
Hollow stopper 8, horizontal clamper and vertical lift frame composition.Vertical lift frame is connected with horizontal clamper, passes through vertical lift
Frame can control the vertical displacement movement of horizontal clamper, and horizontal clamper is connected with the upper end of fire proofed wood charge bar, be pressed from both sides by level
Holder can fix fire proofed wood charge bar, and fire proofed wood charge bar is driven to do vertical up-or-down movement, outer diameter and the calcic core of fire proofed wood charge bar
Round steel bar outer diameter it is identical, the lower end of fire proofed wood charge bar is connected with the round steel bar of calcic core, the circle of fire proofed wood charge bar and calcium core
The axis of rod iron is identical, can be inserted into the round steel bar of fire proofed wood charge bar and calcic core by the oscilaltion campaign for being vertically moved up or down frame
It extracts in hollow stopper or out of hollow stopper.
a:The length of the round steel bar 4 of calcic core is identical with the length of tundish upper nozzle 5, contains weight inside round steel bar 4
For 300g calcium core 43, outside is one layer of steel pipe 42, and the wall thickness of steel pipe 42 is 20mm, the bottom and top of steel pipe 42
Portion seals, and the circumferential surface of steel pipe 42 gathers concave point or concave 41, and the depth of concave point or concave is 19mm.
b:Fire proofed wood charge bar 6 is inserted into hollow stopper 8, and the outer diameter of fire proofed wood charge bar 6 is identical with the outer diameter of round steel bar 4, resistance to
The upper end of fiery material bar 6 is fixed with first level clamper 9, and lower end is connected with the round steel bar 4 of calcic core.
C. the hollow stopper 8 is elongated cylindrical structure, and hollow stopper 8 is internally provided with what cooperation round steel bar 4 was inserted into
Hollow tube, hollow 8 upper end of stopper are fixed with the second horizontal clamper 10；
D. the vertical lift frame is made of lifting pipe 11 and fixed plate 12, lifting pipe 11 and first level clamper 9,
Second horizontal clamper 10 is connected, and fixed plate 12 is fixed on the side wall of tundish 7, and first level is adjusted by being vertically moved up or down frame
The height of 9 and second horizontal clamper 10 of clamper.
In the case where pulling speed of continuous casting significantly reduces and replaces and can not also improve pulling rate after crystallizer invasive nozzle, this
When be judged as having occurred tundish upper nozzle dross phenomenon occur, take at this time in following operating procedure cleaning tundish upper nozzle
Dross object：
The round steel bar 4 of calcic core is inserted into tundish upper nozzle by A：Pulling speed of continuous casting is reduced to the 30% of normal pulling rate, and
The round steel bar 4 of calcic core to be inserted into tundish upper nozzle 5, the upper end of the round steel bar 4 of calcic core is connect with fire proofed wood charge bar 6,
The upper end of fire proofed wood charge bar 6 is fixed on first level clamper 9, adjusting vertical lifting frame, is made during the round steel bar 4 of calcium core is in
Between wrap in the mouth of a river 5
B.Ca steams clear up Al2O3Dross object：The round steel bar 4 of calcic core is in the hot environment of molten steel 1 about 10 seconds
Afterwards, molten steel 1 can burn the box hat at concave point or concave 41 that 4 circumferential surface of round steel bar gathers, occur on the circumference of round steel bar recessed
Hole or gap, calcium core 43 inside round steel bar 4 is heated to become gaseous state, and gaseous calcium is ejected to water on tundish at pothole or gap
Al in mouth 52O3At dross object, Ca and Al2O3Dross object, which reacts, generates 12CaO7Al2O3, by Al2O3Dross object is cleared up
Fall.
C. fire proofed wood charge bar 6 is extracted：The round steel bar 4 of calcic core was inserted into molten steel 1 after 200 seconds can be all molten by molten steel 1
Change, promote vertical lift frame at this time, fire proofed wood charge bar 6 is extracted from molten steel 1.
D:Promote pulling rate：By the Al in tundish upper nozzle 52O3After dross object dross object is cleaned out, continuous casting is slowly improved
Pulling rate is to normal pulling rate.
E:Cut off unqualified strand：Ca and Al2O3The 12CaO7Al of reaction generation low melting point2O3, 12CaO7Al2O3,
Fusing point be about 1400 DEG C, for liquid under molten steel temperature, the 12CaO7Al of generation2O3Field trash flows into crystallizer 2 with steel stream
It is interior, there is larger impact to slab quality, get rid of base processing, at the position of strand scale, 5 dross of tundish upper nozzle will be cleared up
The method excision for the strand gas flame cuttiug that this period of object, interior crystallizer was produced.
Clear up Al2O3The time of dross object is only 5 minutes, pours the secondary time much smaller than continuous casting is replaced, is conducive to continuous casting yield
Promotion；Clear up Al2O3The weight of the unqualified strand generated in the dross object time is only 2.5 tons, caused by production loss it is far small
Loss caused by tundish is replaced.
In the case of the 20% of reduction Casting speed to normal pulling rate, the molten steel flow speed at tundish upper nozzle 5
Still very fast, speed reaches 0.1~0.3 meter per second, and under the drive of the molten steel quickly flowed, unreacted Ca enters with steel stream
In crystallizer 2, Ca will not corrode stopper, will not reduce the service life of stopper.
Claims (6)
1. it is a kind of clear up tundish upper nozzle at Al2O3 dross objects device, the round steel bar including calcic core, fire proofed wood charge bar,
Hollow stopper, horizontal clamper and vertical lift frame；It is characterized in that, vertical lift frame is connected with horizontal clamper, by hanging down
Straight crane can control the vertical displacement movement of horizontal clamper, and horizontal clamper is connected with the upper end of fire proofed wood charge bar, passes through
Horizontal clamper can fix fire proofed wood charge bar, and fire proofed wood charge bar is driven to do vertical up-or-down movement, the outer diameter of fire proofed wood charge bar with
The outer diameter of the round steel bar of calcic core is identical, and the lower end of fire proofed wood charge bar is connected with the round steel bar of calcic core, fire proofed wood charge bar and calcium
The axis of the round steel bar of core is identical, can be by fire proofed wood charge bar and the round steel of calcic core by the oscilaltion campaign for being vertically moved up or down frame
Stick is inserted into hollow stopper or is extracted out of hollow stopper.
2. Al at cleaning tundish upper nozzle as described in claim 12O3The device of dross object, which is characterized in that calcic core
The length of round steel bar is identical with the length of tundish upper nozzle, and containing 50~300g calcium inside round steel bar, outside is one layer of steel
Pipe, the wall thickness of steel pipe is 5~20mm, and the bottom and top of steel pipe seal, and the circumferential surface of steel pipe gathers
The depth of concave point or concave, concave point or concave is 4~19mm.
3. Al at cleaning tundish upper nozzle as described in claim 12O3The device of dross object, which is characterized in that in described
Empty stopper be elongated cylindrical structure, hollow stopper be internally provided with cooperation round steel bar be inserted into hollow tube, hollow stopper upper end with
Horizontal clamper is fixed.
4. Al at cleaning tundish upper nozzle as described in claim 12O3The device of dross object, which is characterized in that the water
Flat clamper is made of the horizontal clamper of stopper and the horizontal clamper of fire proofed wood charge bar, and the horizontal clamper one end of stopper rises with vertical
Drop frame is connected, and the other end is folded with hollow stopper and held；The horizontal clamper of fire proofed wood charge bar, one end are connected with vertical lift frame, separately
One end folds with fire proofed wood charge bar and holds.
5. Al at cleaning tundish upper nozzle as described in claim 12O3The device of dross object, which is characterized in that described hangs down
Straight crane is made of lifting pipe and fixed plate, and lifting pipe is connected with horizontal clamper, and fixed plate is fixed on tundish side wall,
The height of clamper is adjusted by being vertically moved up or down frame.
6. a kind of Al at processing tundish upper nozzle2O3The method of dross object, includes the following steps：
A) judge that dross phenomenon occurs for tundish upper nozzle：
In the case where pulling speed of continuous casting significantly reduces and replaces and can not also improve pulling rate after crystallizer invasive nozzle, sentence at this time
Break and dross phenomenon occur for tundish upper nozzle has occurred,
B) round steel bar of calcic core is inserted into tundish upper nozzle：
Pulling rate is reduced at this time to be inserted into tundish upper nozzle to the 20%~30% of normal pulling rate, and by the round steel bar of calcic core,
The upper end of the round steel bar of calcic core is connect with fire proofed wood charge bar, and the upper end of fire proofed wood charge bar is fixed on horizontal clamper, is adjusted
Frame is vertically moved up or down, the round steel bar of calcium core is made to be in tundish upper nozzle；
C) Ca steams cleaning Al2O3Dross object：
The round steel bar of calcic core is in high-temperature molten steel environment after about 5~15 seconds, and it is close that molten steel can burn round steel bar circumferential surface
Box hat at the concave point or concave of cloth, occurs pothole or gap on the circumference of round steel bar, and the calcium core inside round steel bar, which is heated, to be become
Gaseous state, gaseous calcium are ejected to the Al in tundish upper nozzle at pothole or gap2O3At dross object, Ca and Al2O3Dross object is sent out
Raw reaction generation 12CaO7Al2O3, by Al2O3Dross object cleans up；
D) fire proofed wood charge bar is extracted：
The round steel bar of calcic core is inserted into molten steel and can all be melted by molten steel after 50~200 seconds, promotes vertical lift frame at this time, will be resistance to
Fiery material bar is extracted from molten steel；
E pulling rate) is promoted：
By the Al in tundish upper nozzle2O3After dross object dross object is cleaned out, pulling speed of continuous casting is slowly improved to normal pulling rate；
F unqualified strand) is cut off：
At strand scale position, the strand that this period for clearing up tundish upper nozzle dross object, interior crystallizer was produced is used
The method excision of gas flame cuttiug.
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| CN110385411B (en) * | 2019-08-19 | 2021-02-26 | 中天钢铁集团有限公司 | Method for preventing high-aluminum cold heading steel continuous casting nodulation |
| CN110385411A (en) * | 2019-08-19 | 2019-10-29 | 中天钢铁集团有限公司 | A method of preventing high alumina cold-forging steel continuous casting dross |
| CN113134587A (en) * | 2020-01-17 | 2021-07-20 | 宝山钢铁股份有限公司 | Method for judging water gap blockage and dissolution loss through stopper rod opening degree variation trend |
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| CN114346232A (en) * | 2022-01-07 | 2022-04-15 | 康硕(山西)智能制造有限公司 | A gating system for easily oxidizing large-scale metal casting |
| CN114346232B (en) * | 2022-01-07 | 2024-01-02 | 康硕(山西)智能制造有限公司 | Pouring system for large-scale easily-oxidized metal castings |
| CN116604009A (en) * | 2023-07-17 | 2023-08-18 | 联峰钢铁（张家港）有限公司 | Device and method for rapidly opening flow after flow blocking of tundish |
| CN116604009B (en) * | 2023-07-17 | 2023-10-20 | 联峰钢铁（张家港）有限公司 | Device and method for rapidly opening flow after flow blocking of tundish |
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