CN108176844B - 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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- CN108176844B CN108176844B CN201810034512.8A CN201810034512A CN108176844B CN 108176844 B CN108176844 B CN 108176844B CN 201810034512 A CN201810034512 A CN 201810034512A CN 108176844 B CN108176844 B CN 108176844B
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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
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 continuous 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 steel shell at concave point or concave, occurs pothole or gap on the circumferential surface of round steel bar, calcium core inside round steel bar is heated and becomes gaseous state, and gaseous calcium is ejected to the Al in tundish upper nozzle from 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 replacement continuous casting, is conducive to the promotion of continuous casting yield；Caused by production loss much smaller than replacement 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 technique
Continuous casting is important procedure in metallurgical production process, important fire proofed wood of the mouth of a river as connection tundish and crystallizer
Material, referred to as " neck " of continuous casting, have the function of forming a connecting link, are to ensure that the important link of continuous casting stable operation.Steel plant
In continuous casting process, often there is dross and cause nozzle blocking in middle water containing opening and submersed nozzle, influence continuous casting casting 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 process2O3And 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 continuous casting process, and be one of the main reason for causing steel products defect.
Nippon installs core plate additional in the submersed nozzle ontology made of insulating materials, and before casting, core plate is led to
Electric heating improves mouth of a river inner wall temperature, to avoid Al caused by sharply declining because of steel contacts mouth of a river inner wall temperature2O3Adherency.
Sumitomo Metal Industries develop the technology for making molten steel 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 depth on the outer wall of the mouth of a river to increase cooling surface product, overall process low overheat may be implemented
Casting, avoids nozzle blocking.Weirton steel plant, 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, to improve Cleanliness of Molten Steel.
For the needs for meeting 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.Zhao Guangrong etc. ([this steel technology] 1997 (5): 49~53 " New Subermerged Entry Nozzle in Thin Slab Caster ") thinks 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
Water and mouth of a river inner wall direct contact area are big, A12O3Equal field trashes sticking probability is also big, is modified to stepped annular formula inner cavity
The mouth of a river and bicyclic step type water gap, alleviate A12O3Equal field trashes adherency.([Yunnan metallurgy] 1997,26 (3): 39 such as Chen Chongfeng
~42 " preventing tundish from blocking new technology ") it studies and thinks 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 steel2O3Equal field trashes are easy to be enriched with, therefore mouth of a river working face should be as far as possible
It is smooth.Su Long etc. ([Jiangsu metallurgy] 2003,31 (4): 14~15 " discussions that submersed nozzle shape influences slab quality ")
Study and think from material, put forth effort to develop the nonmetal oxides material such as ZrB2, BN, ZrO-CaO-C material, low carbon materials (carbon <
5%), without silicon Al2O3The mouth of a river of the materials such as C-material and C and Si free materials, investment 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 is 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 is not still able to satisfy 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 continuous 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 efficient operation of continuous casting, the expense for replacing 1 tundish is about 2~3
Wan Yuan will 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 high-melting-point field trash is easy precipitating and is adhered in the mouth of a river
On wall, dross is caused.
After refining procedure carries out Calcium treatment to molten steel, in subsequent continuous casting process, influenced by secondary oxidation, in molten steel
Calcium content can gradually 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
Tumor problem.The casting sequence of steel mill, country production Ultra-low carbon aluminum killed steel (C≤0.005%) is respectively less than 10 furnaces at present.
So although Calcium treatment can alleviate nozzle clogging phenomenon, field trash absolute magnitude is big or Calcium treatment misoperation
In the case where or can cause nozzle clogging phenomenon.
Summary of the invention
In order to solve the above problem, the present invention is for the tundish upper nozzle of dross, provide it is a kind of from hollow stopper to
The method that middle water containing opening is inserted into the rod iron of calcic core to solve the problems, such as tundish upper nozzle dross.
In continuous 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 round tube, and the bottom and top of steel round tube seal, steel round tube
Circumferential surface gather concave point or concave.Molten steel melts away the steel shell at concave point or concave, occurs on the circumferential surface of round steel bar
Pothole or gap, calcium core inside round steel bar is heated to become gaseous state (boiling point of calcium is 1484 DEG C, is lower than liquid steel temperature), gaseous calcium
The Al being ejected to from 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 Al2O3Reaction generates the 12CaO7Al of 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 slab that crystallizer in this period for clearing up tundish upper nozzle dross object is produced is cut off.
The present invention provides a kind of device of Al2O3 dross object at cleaning tundish upper nozzle, 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, and the oscilaltion campaign by being vertically moved up or down frame can be by the round steel of fire proofed wood charge bar and calcic core
Stick is inserted into hollow stopper or extracts out of hollow stopper.
Preferably, the length of the round steel bar of calcic core and the length of tundish upper nozzle are identical, and 50 are contained inside round steel bar
~300g calcium, outside are one layer of steel round tube, and the wall thickness of steel round tube is 5~20mm, and the bottom and top of steel round tube seal,
The depth of the densely covered concave point of the circumferential surface of steel round tube or concave, concave point or concave is 4~19mm.
Preferably, the hollow stopper is elongated cylindrical structure, and the inside of hollow stopper is equipped with cooperation round steel bar insertion
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 vertical lift frame.
The present invention also provides Al at a kind of processing tundish upper nozzle2O3The method of dross object, including 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 can not also improve pulling rate after replacement crystallizer invasive nozzle, this
When be judged as have occurred tundish upper nozzle occur dross phenomenon,
It B) will be in the round steel bar insertion tundish upper nozzle of calcic core:
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, is in the round steel bar of calcium core in tundish upper nozzle；
C) Ca steam clears up 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
There is pothole or gap on the circumference of round steel bar in steel shell at face densely covered concave point or concave, and the calcium core inside round steel bar is heated
Become gaseous state, gaseous calcium is ejected to the Al in tundish upper nozzle from 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 can all be melted after being inserted into molten steel 50~200 seconds by molten steel, promote 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 improves pulling speed of continuous casting and drawn to normal
Speed.
F unqualified slab) is cut off:
At slab scale position, by the casting produced of crystallizer in this period for clearing up tundish upper nozzle dross object
The method of base gas flame cuttiug is cut off.
Ca and Al2O3Reaction generates the 12CaO7Al of low melting point2O3, 12CaO7Al2O3, fusing point be about 1400 DEG C,
It is liquid, the 12CaO7Al of generation under molten steel temperature2O3Field trash with steel stream flow into crystallizer in, to slab quality have compared with
It is big to influence, base processing is got rid of, at slab scale position, by crystallizer in this period for clearing up tundish upper nozzle dross object
The method for the slab gas flame cuttiug produced is cut off.
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 be poured.Clear up Al2O3The time of dross object is only 1~5 minute, much smaller than replacement continuous casting pour time when
Between, be conducive to the promotion of continuous casting yield；Clear up Al2O3The weight of the unqualified slab generated in the dross object time is only 0.5~
2.5 tons, caused by production loss much smaller than replacement tundish caused by loss.
2) molten steel stream in the case where the 20%~30% of reduction Casting speed to normal pulling rate, 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.
Detailed description of the invention
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 round tube；43 be calcium core.
Specific embodiment:
The following examples are further illustrations of the 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 dross 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, can control horizontal clamper 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, can fix fire proofed wood charge bar 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 as 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 as the length of tundish upper nozzle 5, is containing weight inside round steel bar
50~300g calcium core 43, outside are one layer of steel round tube 42, and the wall thickness of steel round tube 42 is 5~20mm, the bottom of steel round tube 42
The depth of portion and top sealing, the densely covered concave point of the circumferential surface of steel round tube 42 or concave 41, 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 as the outer diameter of round steel bar 4, resistance to
The upper end of fiery material bar 6 and first level clamper 9 are fixed, and lower end is connected with the round steel bar 4 of calcic core.
C. the hollow stopper 8 is elongated cylindrical structure, and the inside of hollow stopper 8 is equipped with what cooperation round steel bar 4 was inserted into
Hollow tube, hollow 8 upper end of stopper and the second horizontal clamper 10 are fixed；
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, adjusts first level by vertical lift frame
The height of clamper 9 and the second horizontal clamper 10.
In the case where pulling speed of continuous casting significantly reduces and can not also improve pulling rate after replacement crystallizer invasive nozzle, this
When be judged as that tundish upper nozzle, which has occurred, occurs dross phenomenon, taken in following operating procedure cleaning tundish upper nozzle at this time
Dross object:
The round steel bar 4 of calcic core is inserted into tundish upper nozzle by A: the 20% of reduction pulling speed of continuous casting to normal pulling rate~
30%, and the round steel bar of calcic core 4 is inserted into tundish upper nozzle 5, the upper end of the round steel bar 4 of calcic core and fire proofed wood charge bar
6 connections, the upper end of fire proofed wood charge bar 6 are fixed on first level clamper 9, and adjusting vertical lifting frame makes the round steel bar 4 of calcium core
In tundish upper nozzle 5
B.Ca steam clears 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 steel shell at 4 circumferential surface of round steel bar densely covered concave point or concave 41, 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 from pothole or gap
Al in mouth 52O3At dross object, Ca and Al2O3Dross object, which reacts, generates 12CaO7Al2O3, by Al2O3The cleaning of dross object
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's fusing promotes vertical lift frame at this time, fire proofed wood charge bar 6 is extracted from molten steel 1.
D: pulling rate is promoted: 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: unqualified slab: Ca and Al is cut off2O3Reaction generates the 12CaO7Al of low melting point2O3, 12CaO7Al2O3,
Fusing point be about 1400 DEG C, under molten steel temperature be liquid, 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 slab scale, 5 dross of tundish upper nozzle will be cleared up
The method for the slab gas flame cuttiug that crystallizer is produced in this period of object is cut off.
Embodiment 1:
Below citing and a kind of 1,2,3 pair of the adapting device schematic diagram method for solving the problems, such as tundish upper nozzle dross do into
One step explanation.
The big inclusion quantity of continuous casting are as follows: 50 tons, continuous casting installation for casting are as follows: rectangle blank continuous caster, three machines three stream, casting blank specification 180mm
×220mm。
Clear up tundish upper nozzle at Al2O3 dross object 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, the outer diameter and 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, and the round steel bar of fire proofed wood charge bar and calcic core can be inserted by the oscilaltion campaign by being vertically moved up or down frame
It is extracted in hollow stopper or out of hollow stopper.
A: the length of the round steel bar 4 of calcic core is identical as the length of tundish upper nozzle 5, is containing weight inside round steel bar
50g calcium core 43, outside are one layer of steel round tube 42, and the wall thickness of steel round tube 42 is 5mm, and the bottom and top of steel round tube 42 are close
The depth of envelope, the densely covered concave point of the circumferential surface of steel round tube 42 or concave 41, 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 as the outer diameter of round steel bar 4, resistance to
The upper end of fiery material bar 6 and first level clamper 9 are fixed, and lower end is connected with the round steel bar 4 of calcic core.
C. the hollow stopper 8 is elongated cylindrical structure, and the inside of hollow stopper 8 is equipped with what cooperation round steel bar 4 was inserted into
Hollow tube, hollow 8 upper end of stopper and the second horizontal clamper 10 are fixed；
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, adjusts first level by vertical lift frame
The height of clamper 9 and the second horizontal clamper 10.
In the case where pulling speed of continuous casting significantly reduces and can not also improve pulling rate after replacement crystallizer invasive nozzle, this
When be judged as that tundish upper nozzle, which has occurred, occurs dross phenomenon, taken in following operating procedure cleaning tundish upper nozzle at this time
Dross object:
The round steel bar 4 of calcic core is inserted into tundish upper nozzle by A: reduction pulling speed of continuous casting 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 steam clears 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 steel shell at 4 circumferential surface of round steel bar densely covered concave point or concave 41, 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 from pothole or gap
Al in mouth 52O3At dross object, Ca and Al2O3Dross object, which reacts, generates 12CaO7Al2O3, by Al2O3The cleaning of dross object
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, promotes vertical lift frame at this time, fire proofed wood charge bar 6 is extracted from molten steel 1.
D: pulling rate is promoted: 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: unqualified slab: Ca and Al is cut off2O3Reaction generates the 12CaO7Al of low melting point2O3, 12CaO7Al2O3,
Fusing point be about 1400 DEG C, under molten steel temperature be liquid, 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 slab scale, 5 dross of tundish upper nozzle will be cleared up
The method for the slab gas flame cuttiug that crystallizer is produced in this period of object is cut off.
Clear up Al2O3The time of dross object is only 1 minute, pours the secondary time much smaller than replacement continuous casting, is conducive to continuous casting yield
Promotion；Clear up Al2O3The weight of the unqualified slab generated in the dross object time is only 0.5 ton, caused by production loss it is far small
In replacing loss caused by tundish.
Molten steel flow speed in the case where the 20% of reduction Casting speed to normal pulling rate, 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 a kind of 1,2,3 pair of the adapting device schematic diagram method for solving the problems, such as tundish upper nozzle dross do into
One step explanation.
The big inclusion quantity of continuous casting are as follows: 120 tons, continuous casting installation for casting are as follows: 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 object 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, the outer diameter and 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, and the round steel bar of fire proofed wood charge bar and calcic core can be inserted by the oscilaltion campaign by being vertically moved up or down frame
It is extracted in hollow stopper or out of hollow stopper.
A: the length of the round steel bar 4 of calcic core is identical as 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 round tube 42, and the wall thickness of steel round tube 42 is 20mm, the bottom and top of steel round tube 42
The depth of portion's sealing, the densely covered concave point of the circumferential surface of steel round tube 42 or concave 41, 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 as the outer diameter of round steel bar 4, resistance to
The upper end of fiery material bar 6 and first level clamper 9 are fixed, and lower end is connected with the round steel bar 4 of calcic core.
C. the hollow stopper 8 is elongated cylindrical structure, and the inside of hollow stopper 8 is equipped with what cooperation round steel bar 4 was inserted into
Hollow tube, hollow 8 upper end of stopper and the second horizontal clamper 10 are fixed；
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, adjusts first level by vertical lift frame
The height of clamper 9 and the second horizontal clamper 10.
In the case where pulling speed of continuous casting significantly reduces and can not also improve pulling rate after replacement crystallizer invasive nozzle, this
When be judged as that tundish upper nozzle, which has occurred, occurs dross phenomenon, taken in following operating procedure cleaning tundish upper nozzle at this time
Dross object:
The round steel bar 4 of calcic core is inserted into tundish upper nozzle by A: reduction pulling speed of continuous casting 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 steam clears 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 steel shell at 4 circumferential surface of round steel bar densely covered concave point or concave 41, 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 from pothole or gap
Al in mouth 52O3At dross object, Ca and Al2O3Dross object, which reacts, generates 12CaO7Al2O3, by Al2O3The cleaning of dross object
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, promotes vertical lift frame at this time, fire proofed wood charge bar 6 is extracted from molten steel 1.
D: pulling rate is promoted: 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: unqualified slab: Ca and Al is cut off2O3Reaction generates the 12CaO7Al of low melting point2O3, 12CaO7Al2O3,
Fusing point be about 1400 DEG C, under molten steel temperature be liquid, 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 slab scale, 5 dross of tundish upper nozzle will be cleared up
The method for the slab gas flame cuttiug that crystallizer is produced in this period of object is cut off.
Clear up Al2O3The time of dross object is only 5 minutes, pours the secondary time much smaller than replacement continuous casting, is conducive to continuous casting yield
Promotion；Clear up Al2O3The weight of the unqualified slab generated in the dross object time is only 2.5 tons, caused by production loss it is far small
In replacing loss caused by tundish.
Molten steel flow speed in the case where the 20% of reduction Casting speed to normal pulling rate, 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 (2)
1. Al at a kind of processing tundish upper nozzle2O3The method of dross object, including 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 can not also improve pulling rate after replacement crystallizer invasive nozzle, sentence at this time
Break and dross phenomenon occur for tundish upper nozzle,
It B) will be in the round steel bar insertion tundish upper nozzle of calcic core:
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
It is vertically moved up or down frame, is in the round steel bar of calcic core in tundish upper nozzle；
C) Ca steam clears up Al2O3Dross object:
The round steel bar of calcic core is in high-temperature molten steel environment after 5~15 seconds, and molten steel can burn round steel bar circumferential surface and gather
Concave point or concave at steel shell, there is pothole or gap on the circumference of round steel bar, the calcium core inside round steel bar is heated to become gas
State, gaseous calcium are ejected to the Al in tundish upper nozzle from pothole or gap2O3At dross object, Ca and Al2O3Dross object occurs
Reaction generates 12CaO7Al2O3, by Al2O3Dross object cleans up；
D) fire proofed wood charge bar is extracted:
The round steel bar of calcic core can all be melted after being inserted into molten steel 50~200 seconds by molten steel, promote 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 is cleaned out, pulling speed of continuous casting is slowly improved to normal pulling rate；
F unqualified slab) is cut off:
At slab scale position, the slab that crystallizer in this period for clearing up tundish upper nozzle dross object is produced is used
The method of gas flame cuttiug is cut off.
2. Al at processing tundish upper nozzle as described in claim 12O3The method of dross object, which is characterized in that the calcic
The length of the round steel bar of core and the length of tundish upper nozzle are identical, and 50~300g calcium is contained inside round steel bar, and outside is one layer
Steel round tube, the wall thickness of steel round tube are 5~20mm, and the bottom and top of steel round tube seal, the circumferential surface of steel round tube
Gather concave point or concave, and the depth of concave point or concave is 4~19mm.
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Effective date of registration: 20210623 Address after: 271104 Shuangquan Road, Gangcheng District, Jinan City, Shandong Province Patentee after: LAIGANG GROUP YINSHAN SHAPED STEEL Co.,Ltd. Address before: 271104 No.99, Fuqian street, Gangcheng District, Laiwu City, Shandong Province Patentee before: SHANDONG IRON AND STEEL Co.,Ltd. |