CN109562443A - Casting buoying device and the casting method for using it - Google Patents
Casting buoying device and the casting method for using it Download PDFInfo
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- CN109562443A CN109562443A CN201680088394.8A CN201680088394A CN109562443A CN 109562443 A CN109562443 A CN 109562443A CN 201680088394 A CN201680088394 A CN 201680088394A CN 109562443 A CN109562443 A CN 109562443A
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- crystallizer
- molten steel
- buoying device
- casting
- protecting residue
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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
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
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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
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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
- B22D11/111—Treating the molten metal by using protecting powders
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to casting buoying device and using its casting method, the casting method is the following steps are included: molten steel is injected in crystallizer；Crystallizer protecting residue is supplied on the top of the molten steel；By will include that the buoying device of refractory material is inserted into the top of the molten steel, makes at least part of the buoying device and the steel contacts and contact at least part with the crystallizer protecting residue；And by making the molten steel solidification come block; wherein the block the step of in; the area of molten steel contacted with crystallizer protecting residue can be made to be less than the area of the molten steel surface in crystallizer by using the buoying device; and therefore can inhibit the deterioration of crystallizer protecting residue, it is enable to improve the quality and productivity of slab.
Description
Technical field
This disclosure relates to cast the casting method used buoying device (jig) and use it, and more particularly, in this way
Casting buoying device and use its casting method: wherein the deterioration of crystallizer protecting residue is suppressed, and it is thus possible to improve
The quality and productivity of slab.
Background technique
In general, manufacturing slab while making to accommodate molten steel in a crystallizer and cooling down by cooling section.For example, continuous casting
Technique is such technique: wherein molten steel injection being had in the crystallizer of certain interior shape, and will be half in crystallizer
The slab of solidification continuously draws the downside to crystallizer, to manufacture various semi-finished product, such as slab, bloom (bloom), small side
Base (billet) and shaped blank (beam blank).
In such continuous casting process, solidification carries out in this way: slab is cooled first in crystallizer, then
Its water secondary cooling is sprayed to after through crystallizer.The solidification of molten steel is carried out from the edge of crystallizer, at this point, tying
Brilliant device periodically vibrates, and rubs to carry out generating when being continuously injected into and solidifying for molten steel in a crystallizer.In addition, will crystallization
Device covering slag is injected on the molten steel in crystallizer, allows to successfully be lubricated in mold oscillation.Crystallizer is protected
Shield slag is introduced between the solidification layer of molten steel and crystallizer so that the minimum that rub, and to controlling between molten steel and crystallizer
Rate of heat transfer play an important role.
Al meanwhile in the case where high Al high Mn steel, since the concentration of Al component in molten steel is very high, in molten steel
Component with include SiO in crystallizer in slag2If following formula 1 reacts, so that the SiO in crystallizer protecting residue2It reduces and Al2O3
Increase.Therefore, slag (mold slag) deteriorates in crystallizer, and deterioration rate is accelerated according to the passage of casting time.
The deterioration of slag can occur as follows in crystallizer.
[formula 1]
[Al]+(SiO2)1→[Si]+(Al2O3)↑
Al component in molten steel is collected into crystallizer in slag for example, by the reaction of formula 1, and according to casting into
It goes (that is, casting length is longer), the collection of Al component is further speeded up in slag in crystallizer, and therefore, makes Al2O3In diversity.
On the contrary, the SiO in crystallizer in slag2It reduces, and therefore, changes the viscosity, basicity and setting temperature of crystallizer protecting residue.
The deterioration of such crystallizer protecting residue makes the clinker being formed on the inner wall of crystallizer or slag circle (slag bear
Or rim) Acceleration of growth, and inhibit the introducing of crystallizer protecting residue between crystallizer and molten steel, so that due in steel
The interruption conducted heat when water solidifies originally and can not uniformly around form local solidification layer in the transverse central portion of slab, and
Big vertical surface crackle is generated in slab.Due to such big vertical surface crackle not easily pass through scarfing or
Grinding technics removes, so production cost inevitably increases because of defect cost.
Summary of the invention
Technical problem
This disclosure provides casting buoying device and using its casting method, wherein reducing molten steel and crystallizer guarantor
The contact area between slag is protected, and therefore, the deterioration of crystallizer protecting residue can be inhibited.
The present disclosure also provides casting buoying device and casting methods, wherein the casting efficiency and product of slab can be improved
Matter.
Technical solution
According to an exemplary implementation scheme, the casting buoying device in the molten steel being inserted into inside crystallizer during casting has
The specific gravity for having the specific gravity of specific gravity more smaller than the specific gravity of molten steel and the crystallizer protecting residue than being arranged on molten steel bigger, and wrap
Containing refractory material.
Buoying device may include: ontology, have area more smaller than the bath surface of the molten steel inside crystallizer；And it holds
Portion is held, is arranged on the upper surface of ontology.
Ontology can be formed as plate.
Ontology can be formed to have the box-like of open type lower part.
Ontology can be formed to have the frame-shaped of the smaller size of area of the bath surface of the molten steel inside than crystallizer.
Ontology may include the outwardly projecting protruding portion on the side surface of ontology.
The specific gravity of buoying device can be about 3.0g/cm3To 6.5g/cm3。
The specific gravity of buoying device can be about 3.0g/cm3To 3.2g/cm3。
The thickness of buoying device can be about 20mm to 50mm.
According to another exemplary implementation scheme, casting method includes: to inject molten steel in crystallizer；Crystallizer is protected
Slag supplies on molten steel；By comprising refractory material buoying device insertion molten steel top, with thus make at least part of buoying device with
Steel contacts simultaneously contact at least part with crystallizer protecting residue；And by making molten steel solidification come block, wherein
In the casting of slab, buoying device is for making the area of molten steel contacted with crystallizer protecting residue relative to the molten steel inside crystallizer
The area of bath surface reduces.
Buoying device can be arranged in for molten steel to be injected two sides near the submersed nozzle in crystallizer.
In the casting of slab, at least part at the edge of buoying device can be made with the spaced apart from inner walls of crystallizer.
In the casting of slab, crystallizer protecting residue can be injected between buoying device and the inner wall of crystallizer.
Buoying device can be formed to have the frame-shaped of the smaller size of area of the bath surface of the molten steel inside than crystallizer,
It and may include: the first area being formed on the inside of buoying device；And be formed between buoying device and the inner wall of crystallizer second
Region, wherein the crystallizer protecting residue melted can be supplied to first area and second area.
Buoying device can be formed to have the frame-shaped of the smaller size of area of the bath surface of the molten steel inside than crystallizer,
It and may include: the first area being formed on the inside of buoying device；And be formed between buoying device and the inner wall of crystallizer second
Region, wherein the crystallizer protecting residue of solid phase can be supplied to first area, and the crystallizer protecting residue of melting is supplied to
Two regions.
The casting of slab may include the position of measurement buoying device to measure the level of the bath surface of molten steel.
Beneficial effect
According to some exemplary implementation schemes, the contact area between molten steel and crystallizer protecting residue reduces, and therefore may be used
To inhibit reacting between the field trash and crystallizer protecting residue in molten steel.Therefore, it is suppressed that the deterioration of crystallizer protecting residue, and
And inhibit and form clinker on the inner wall of crystallizer, and therefore, crystallizer protecting residue can be successfully introduced into crystallizer
Inner wall and molten steel between.Therefore, in the casting of slab, promote lubricating action and the crystallizer protection of crystallizer protecting residue
The heat sinking function and heat insulating function of slag, and therefore, molten steel can be made equably to solidify.In addition, it is suppressed that slab is drawn by clinker
Rise defect, and it is thus possible to improve slab quality and productivity.
Detailed description of the invention
Fig. 1 is the schematic diagram for showing Casting Equipment.
Fig. 2 is the figure for showing the internal state of crystallizer when by being cast according to the casting method of typical technology.
Fig. 3 is the change of component for showing crystallizer protecting residue when by being cast according to the casting method of typical technology
Figure.
Fig. 4 is the schematic diagram for showing the construction of the casting buoying device according to an exemplary implementation scheme.
Fig. 5 to 7 is the schematic diagram for showing the construction of the casting buoying device according to some improved exemplary implementation schemes.
Fig. 8 is the flow chart for showing sequentially the casting method according to an exemplary implementation scheme.
Fig. 9 is relatively and to show in the component (Al by using crystallizer protecting residue after testing conticaster casting2O3) become
The figure of change.
Figure 10 is the figure for showing the temperature change when being cast by using test conticaster.
Specific embodiment
Hereinafter, some exemplary implementation schemes be will be described in detail with reference to the accompanying drawings.However, present disclosure can be with difference
Form implement, and should not be construed as limited to embodiment set forth herein.On the contrary, thesing embodiments are provided so that this
Disclosure is full and complete, and will scope of the present disclosure be fully conveyed to those skilled in the art.
Fig. 1 is the schematic diagram for showing Casting Equipment；Fig. 2 is shown by being cast according to the casting method of typical technology
The figure of situation when making inside crystallizer；And Fig. 3 is shown when by being cast according to the casting method of typical technology
The figure of the change of component of crystallizer protecting residue.
Referring to Fig.1, Casting Equipment may include: steel ladle 10, be used to accommodate the molten steel refined by process for making；Note
Jetting orifice 10 is connected to steel ladle 10；Tundish 20, receiving (are not shown by protection sleeve pipe (shroud nozzle) for example
Molten steel out) temporarily stores molten steel, and molten steel is supplied to crystallizer 30；Crystallizer 30 is accommodated by being connected to tundish
The molten steel of 20 submersed nozzle 22 simultaneously makes it be frozen into the effigurate initial solidification layer Mc of tool；And cooling line 40,
Be arranged in crystallizer 30 in the following, and be continuously disposed with a plurality of sections wherein, to be pulled out not cooling from crystallizer 30
A series of shaping operations are carried out while solidifying slab 1.
Referring to Fig. 2, when starting to cast and by submersed nozzle 22 by molten steel M injection crystallizer tundish 20 inside
When in 30, crystallizer protecting residue can be supplied on the molten steel being injected into crystallizer 30.Crystallizer protecting residue can be such as
It is supplied on molten steel in the form of a powder, and is also used as what the wherein liquid phase dissolved with solid crystal device covering slag melted
Crystallizer protecting residue provides.Hereinafter, the example of crystallizer protecting residue description melted using liquid phase, and liquid phase is melted
The crystallizer protecting residue melted is known as crystallizer protecting residue.
When casting progress, crystallizer protecting residue is introduced in crystallizer 30 and being applied to the vibration of crystallizer 30
Between inner wall and molten steel and lubricating action is provided, and therefore, can pull out below crystallizer 30 and to be solidified in crystallizer 30
Molten steel as solidification unit Mc.At this point, crystallizer protecting residue can play the function in addition to lubricating action, such as absorb simultaneously
It removes the field trash in molten steel, molten steel is made to keep warm and Heat Transfer Control.
During casting, the SiO of crystallizer protecting residue2Component is reacted with the field trash (such as Al component) in molten steel and is produced
Raw Al2O3, and the Al so generated2O3It is attached to the inner wall of crystallizer 30 and solidifies and form clinker R.In addition, due in this way
Reaction, the SiO in crystallizer protecting residue2Component is reduced, therefore the basicity (CaO/SiO of the crystallizer protecting residue melted2) increase
Add, and therefore, the viscosity of crystallizer protecting residue increases.When the viscosity of crystallizer protecting residue increases, possibly can not be by crystallizer
Covering slag is successfully introduced between the inner wall and molten steel of crystallizer 30.
Particularly, comprising the high Al high Mn steel of a large amount of Al components, with the progress of casting, such crystallization
The deterioration of device covering slag accelerates, and accordingly, there exist the limitations for being not easy to be cast in a stable manner.As shown in figure 3, casting
Carry out further, the Al in crystallizer protecting residue2O3Component and SiO2Component has the relationship of further inverse proportion.?
That is compared with the initial stage of casting, the Al in the final stage of casting2O3About 10 times of component increase；And with casting
Initial stage is compared, SiO2Component is reduced to about 1/5.Accordingly, there exist the big of the depth with about 16mm is generated in casting
The problem of vertical surface crackle.
Therefore, in this exemplary embodiment, reduce the contact area between molten steel and crystallizer protecting residue, to inhibit
Reacting between the field trash and crystallizer protecting residue in molten steel, and therefore, the deterioration of crystallizer protecting residue can be inhibited, and
It can inhibit the appearance of clinker.
Fig. 4 is the schematic diagram for showing the construction of the casting buoying device according to an exemplary implementation scheme；And Fig. 5 to 7
It is the schematic diagram for showing the construction of the casting buoying device according to some improved exemplary implementation schemes.
Firstly, crystallizer 30 can be formed as including: two long side surfaces relative to each other；And it is arranged in and is handed over long side surface
On the direction of fork and two short sides relative to each other.Can have by two long side surfaces of connection and two short sides to be formed
The crystallizer 30 of the hollow rectangular shape of open type upper and lower part.In addition, the molten steel being stored in tundish 20 is injected
The submersed nozzle 22 of crystallizer 30 can be arranged in the central part of crystallizer 30.
It may include refractory material with buoying device according to the casting of an exemplary implementation scheme, can be inserted in molten steel,
And there is less than molten steel M and be greater than the specific gravity for the crystallizer protecting residue F being arranged on the top of molten steel M.Buoying device can be formed
For with about 3.0g/cm3To 6.5g/cm3, and preferably, about 3.0g/cm3To 3.2g/cm3Specific gravity.The specific gravity of molten steel M is
About 6.9g/cm3To 7.1g/cm3, the specific gravity of crystallizer protecting residue is about 2.7g/cm3.However, when by buoying device manufacture at have
When specific gravity in above range, the specific gravity of buoying device can be smaller than the specific gravity of molten steel M and the specific gravity than crystallizer protecting residue F more
Greatly.Therefore, during casting, buoying device can be arranged between molten steel M and crystallizer protecting residue F and reduce molten steel M and crystallizer
Contact area between covering slag F.Therefore, reacting between molten steel M and crystallizer protecting residue F is suppressed, and in molten steel M
Field trash (such as Al component) is collected into crystallizer protecting residue F, to be modified crystallizer protecting residue F, allows to inhibit
Crystallizer protecting residue F deterioration, thus the phenomenon that the increase of the viscosity of formation clinker or crystallizer protecting residue F.
Buoying device can be manufactured by using the material with excellent heat resistance and chemical resistance, to bear high-temperature steel
Water and crystallizer protecting residue.In addition, buoying device can advantageously by not in molten steel field trash or crystallizer protecting residue react
Material manufacture.For example, buoying device can be made into comprising ZrB2。
Buoying device may include: ontology, be at least partially submerged in molten steel；And grip part, the upper of ontology is set
For being attached and dismantling buoying device on surface.Ontology can be played when swimming on molten steel is substantially reduced molten steel and crystallizer guarantor
Protect the effect of the contact area between slag.
Buoying device can be inserted into crystallizer during casting, and can at least partly contact molten steel and at least partly
Ground contacts crystallizer protecting residue.Here, buoying device contacts the fact that molten steel it could mean that the part bottom surface of buoying device and side surface
Be partially immersed in molten steel and be arranged on the interface of molten steel and crystallizer protecting residue；And buoying device contact crystallizer protection
The fact that slag, is it could mean that at least part of buoying device is arranged in inside crystallizer protecting residue or a part of cloth of side surface
It sets inside crystallizer protecting residue and a part of side surface and upper surface is exposed to the outside of crystallizer protecting residue.Therefore, it floats
Tool is arranged on the interface between molten steel and crystallizer protecting residue, reduces connecing between molten steel and crystallizer protecting residue in floating
Contacting surface product allows to that the field trash in wherein molten steel is inhibited to be collected into crystallizer protecting residue, and therefore, crystallizer protection
The phenomenon that slag deteriorates.Advantageously, buoying device is arranged to not contact the inner wall of the crystallizer inside crystallizer.That is, buoying device is protected
In the state of holding the spaced apart from inner walls of the crystallizer inside at least part at the edge of buoying device with crystallizer, so that crystallizer
Covering slag is successfully introduced between buoying device and the inner wall of crystallizer, and can also inhibit the deterioration of crystallizer protecting residue.
The ontology of buoying device can be formed as various shape, and be formed to have the melt of the molten steel inside less than crystallizer
The area of the area on surface.
Hereinafter, multiple examples of buoying device will be described.
Referring to Fig. 4, it may include: ontology 101 according to the buoying device 100 of an exemplary implementation scheme, be formed to have
The plate of area more smaller than the bath surface of the molten steel inside crystallizer 30, such as the shape of rectangular slab；And grip part
102, the upper surface of ontology 101 is connected to the attachment and disassembly for ontology 101.
Ontology 101 can be formed to have the thickness of such degree: when ontology is inserted into crystallizer 30, the one of ontology
Part can immerse in molten steel M and a part can be arranged in inside crystallizer protecting residue F, for example, being formed to have about
The thickness of 20mm to 50mm.At this point, ontology 101 can be arranged to immerse in crystallizer protecting residue F according to its thickness, and ontology
101 a part of can be arranged in inside crystallizer protecting residue F and part of it can be exposed to the outer of crystallizer protecting residue F
Portion.
Buoying device 100 can be inserted in crystallizer 30, and can be inserted near submersed nozzle 22 in side and the other side
Each in.Therefore, buoying device 100 may be disposed so that except it is divided in the edge part on the direction of neighbouring submersed nozzle 22
The spaced apart from inner walls of outer remainder and crystallizer 30.
In other words, buoying device 100 can be formed to have area more smaller than the area of the bath surface of molten steel M, be formed
Side or the other side near submersed nozzle 22.At this point, buoying device 100 can be formed such that edge and the crystallization of buoying device 100
The inner wall and the edge of buoying device 100 and the peripheral surface of submersed nozzle 22 of device 30 are spaced about 20mm to 40mm separately from each other.
The insertion condition of such buoying device 100 can also be applied to the example being described below in the same manner.
Meanwhile during casting, in the state of being maintained at and swum on molten steel M due to buoying device 100, buoying device can lead to
It crosses the flowing of molten steel M and vertically or horizontally moves.At this point, the edge of buoying device 100 can when buoying device 100 moves horizontally
It can contact or be in close contact with the inner wall of crystallizer 30.In this way, when buoying device 100 edge contacted with the inner wall of crystallizer 30 or tightly
When contiguity touching, crystallizer protecting residue F can not be introduced between buoying device 100 and the inner wall of crystallizer 30, and therefore, heat transmission function
It may partly deteriorate.
Therefore, as shown in figure 5, can also be formed on the edge of buoying device 200 (that is, on the edge of ontology 201) outward
Portion is prominent or towards the protruding portion 203 outstanding of crystallizer 30.Can be formed on the circumferencial direction of ontology 201 at least one or more
Multiple protruding portion 203.Protruding portion 203 minimizes the contact area between ontology 201 and inner wall, and works as the side of ontology 201
When edge is contacted or is in close contact with the inner wall of crystallizer 30, protruding portion accommodates the crystallizer in the space between protruding portion 203 and protects
Slag F is protected, so that crystallizer protecting residue F is successfully introduced between ontology 201 and the inner wall of crystallizer 30.Therefore, protruding portion
203 can be each formed as with curved surface or sharp parts, and can be advantageously formed as can reduce protruding portion 203
The shape of contact area between the inner wall of crystallizer 30.
At this point, when buoying device 200 to be inserted into crystallizer 30, the distance between the inner wall of protruding portion 203 and crystallizer 30
The distance between the inner wall of the ontology 101 and crystallizer 30 without the Fig. 4 for forming protruding portion 203 can be similar to.In this way
Protruding portion 203 can also be applied to other examples for describing below.
Referring to Fig. 6, buoying device 300 can also include: ontology 301, have the box shaped with open type lower part；And it holds
Portion 302 is held, is arranged on the upper surface of ontology 301.In other words, ontology 301 may include: the horizontal part with plate
301a；And the vertical component effect 301b extended downwardly along the edge of horizontal part 301a.It with such a configuration, can be in ontology 301
Inside forms space.At this point, at least part of vertical component effect 301b can immerse in molten steel M, and at least part can be with cloth
It sets inside crystallizer protecting residue F.In this case, according to the length of vertical component effect 301b, horizontal part 301a can be arranged to
It immerses in crystallizer protecting residue F, or can also be arranged on crystallizer protecting residue F.
When buoying device 300 to be inserted into crystallizer 30, at least part of vertical component effect 301b can immerse in molten steel M, and
And thus vertical component effect 301b can make the inside and outside separation of ontology 301.Therefore, even if as molten steel M and crystallizer protecting residue F
It is reacted with each other in the inner space of ontology 301 and when crystallizer protecting residue F is thus deteriorated, is introduced into the inner wall of crystallizer 30
Crystallizer protecting residue F between molten steel M is also unaffected.Therefore, the response area of crystallizer protecting residue F and molten steel M reduces,
And thus the deterioration of crystallizer protecting residue F postpones, allow to reduce the clinker generated on the inner wall of crystallizer 30, also prolong
The viscosity change of slow crystallizer protecting residue F, and therefore, crystallizer protecting residue F can be successfully introduced into crystallizer 30
Between wall and molten steel M.
Referring to Fig. 7, buoying device 400 may include: ontology 401, have the frame shape with open type central part；It holds
Portion 402 is arranged on the upper surface of ontology 401.In this case, ontology 401 can play and ontology shown in fig. 6
301 vertical component effect 301b similar effect.That is, at least part of frame-shaped ontology 401 immerses in molten steel M, and a part can
To be arranged in inside crystallizer protecting residue F, and it can thus make the inside and outside separation of ontology 401.Therefore, even if working as steel
When water M and crystallizer protecting residue F is reacted with each other in the inner space of ontology 401 and crystallizer protecting residue F is thus deteriorated, position
Crystallizer protecting residue F outside ontology 401 is also unaffected.Therefore, crystallizer protecting residue F outside ontology 401
Deterioration delay, and the clinker generated on the inner wall of crystallizer 30 can be thus reduced, and go back delayed crystallisation device covering slag F
Viscosity change, and therefore, crystallizer protecting residue F can be successfully introduced between the inner wall of crystallizer 30 and molten steel M.
In such a case, it is possible to by the inside of the crystallizer protecting residue injection ontology 401 of same type (for example, injection
First area A) and injection ontology 401 outside (for example, injection second area B), and can also inject different types of
Crystallizer protecting residue.For example, in crystallizer protecting residue injection both the first area A and second area B that liquid phase can be melted,
Or the crystallizer protecting residue injection that the crystallizer protecting residue of solid phase can be injected to first area A and liquid phase can be melted
Second area B.Latter situation is limited to such situation, and wherein at least part (for example, top) of ontology 401 can expose
In the top of crystallizer protecting residue, so that first area A and second area B are kept completely separate.
Hereinafter, by description according to the casting method of an exemplary implementation scheme.
Fig. 8 is the flow chart according to the casting method of an exemplary implementation scheme.Here, will describe by using Fig. 4
Shown in an example being cast of buoying device.
Casting method according to an exemplary implementation scheme may include: to inject molten steel in crystallizer 30 (S110)；
Crystallizer protecting residue (S120) is supplied on the top of molten steel；The buoying device 100 formed by refractory material is inserted into the top of molten steel,
To submerge at least part of buoying device 100, and at least part of buoying device is arranged in crystallizer protecting residue (S130)；And
Make molten steel solidification with block (S140).At this point, in the casting of slab, by using buoying device 100, can make molten steel with
The area of crystallizer protecting residue contact is less than the area in the bath surface region of the molten steel inside crystallizer.It is thereby possible to reduce
Response area between crystallizer protecting residue and molten steel, with inhibition or the deterioration of delayed crystallisation device covering slag.
Firstly, when the molten steel and crystallizer protecting residue for being ready to refine completely by converter smelter etc., by molten steel and
Crystallizer protecting residue injects in crystallizer 30.At this point, molten steel can be the high Al high Mn of the aluminium comprising about 3 weight % or more
Steel.In addition, crystallizer protecting residue can be the crystallizer protecting residue of the melting by using fusings such as plasmatorch.
Next, when by molten steel inject crystallizer 30 to a certain degree when, by buoying device 100 be inserted into crystallizer 30.Due to such as
The upper buoying device 100 has less than molten steel and is equal to or more than the specific gravity of crystallizer protecting residue, therefore a part of buoying device can
To immerse in molten steel and in a part of top that can be arranged in crystallizer protecting residue inside and crystallizer protecting residue.At this point, can
Buoying device 100 to be inserted into the two sides for the submersed nozzle 22 for being used to inject on molten steel crystallizer by using grip part 102, and
And the edge of buoying device 100 can be arranged to the scheduled distance in inner wall interval of crystallizer 30 (for example, about 20mm to 40mm).
Therefore, clearance space can be formed between buoying device 100 and the inner wall of crystallizer 30, and within this space, it can
Crystallizer protecting residue to be arranged on molten steel.In addition, buoying device 100 directly connects with molten steel in the part for being disposed with buoying device 100
Touching.Therefore, the crystallizer protecting residue for injecting the top of molten steel is pushed to the outside or upside of buoying device 100, and can thus press down
Contact between molten steel processed and crystallizer protecting residue.Therefore, molten steel can be reduced by injecting buoying device 100 in crystallizer 30
Contact area between crystallizer protecting residue.
Then, when the level of the bath surface of molten steel reaches the degree that can be cast, casting can be started to cast
Make slab.At this point it is possible to by using position (that is, the position of the height of the upper surface of the ontology 100 of buoying device 100 or grip part 102
Set) come measure molten steel bath surface level.That is, since buoying device 100 is maintained at floating shape inside crystallizer 30
Under state, therefore when known to size (such as height of buoying device 100), the bath surface of molten steel can be measured by the size
Level.
When casting progress, it is maintained at and is swum on molten steel or between molten steel and crystallizer protecting residue in buoying device 100
When under state, and when being cast, buoying device 100 remains at the contact area between molten steel and crystallizer protecting residue and subtracts
In the state of small.At this point, buoying device 100 by the flowing of molten steel in 30 internal flow of crystallizer, the edge of buoying device 100 can
To contact or be in close contact with the inner wall of crystallizer 30.In this case, it is possible to be limited in connecing with buoying device 100 for crystallizer 30
The introducing of the crystallizer protecting residue of touching or the inner wall side being in close contact.At this point, as shown in figure 5, when use is provided with protruding portion 203
Buoying device 200 when, the contact area between buoying device 200 and the inner wall of crystallizer 30 can be made to minimize, and shape can be passed through
Crystallizer protecting residue is introduced at the space between protruding portion 203.
In addition, crystallizer protecting residue can be continuously injected on molten steel when casting progress.
Meanwhile as shown in fig. 7, buoying device 100 can be divided into inside (example when using the buoying device 400 for being formed as frame-shaped
Such as, first area A) and outside (for example, second area B).In such a case, it is possible to which identical crystallizer protecting residue is injected
First area A and second area B, and different types of crystallizer protecting residue can be injected separately into.For example, liquid phase can be melted
In crystallizer protecting residue injection both the first area A and second area B melted, or the crystallizer protecting residue of solid phase can be infused
Enter first area A and the crystallizer protecting residue that can be melted liquid phase injects second area B.
Hereinafter, description is passed through into the experimental example according to the casting method block of an exemplary implementation scheme.
Fig. 9 is relatively and to show in the component (Al by using crystallizer protecting residue after testing conticaster casting2O3) become
The figure of change；And Figure 10 is the figure for showing the temperature change of crystallizer when being cast by using test conticaster.
The test conticaster used in an experiment can be about 100mm to 140mm with cast thickness and width is about 1000mm
Slab, and by using test conticaster casting slab about 10 minutes of about 10m.
About use test conticaster and do not use buoying device work on hand method (comparative example), and by immerse float
Formula buoying device is sampled crystallizer protecting residue according to casting distance and analyzes crystallizer come (embodiment) the case where casting
Al in covering slag2O3Component.Fig. 9 shows analysis result.
Referring to Fig. 9, in the comparative example without using buoying device, with the progress of casting, it can be found that in crystallizer protecting residue
Al2O3The percentage of component sharply increases, and increases about twice or more than the initial stage in casting in the final stage of casting
It is more.
On the contrary, in the embodiment cast by using buoying device, it is found that when casting progress, crystallizer is protected
Protect the Al in slag2O3Component increases, but advances the speed lower than advancing the speed in comparative example, and increases in the last of casting
Stage stops when increasing about 0.5 times of initial stage.
It is therefore found that can press down when the contact area during casting between molten steel and crystallizer protecting residue reduces
Aluminium component in molten steel processed is collected into crystallizer protecting residue, and can inhibit the deterioration of crystallizer protecting residue.
Figure 10 shows the analysis of the measurement of the temperature change of crystallizer and the component of crystallizer protecting residue.
(a) of Figure 10 is the temperature for showing the crystallizer in the comparative example wherein cast without using buoying device
Spend the figure of variation；And (b) of Figure 10 shows the temperature of the crystallizer in the embodiment wherein cast by using buoying device
Variation.
Firstly, 0 (a) referring to Fig.1, with the progress of casting, the temperature swing of thermocouple becomes stronger, and also found
Electric thermo-couple temperature decline.This is because crystallizer protecting residue and molten steel react with each other and the Al component in molten steel is introduced into crystallizer
Caused by covering slag, and thus crystallizer protecting residue deteriorates.In this way, when crystallizer protecting residue deterioration, in crystallizer
Clinker is generated on inner wall, the viscosity of crystallizer protecting residue increases, and crystallizer protecting residue can not be successfully introduced into crystallization
Between device and molten steel, so that the temperatures of lubricating action and heat transmission function deterioration and thermocouple become unstable.
On the contrary, 0 (b) referring to Fig.1, it can be found that when being cast, the temperatures of thermocouple be it is stable and
Temperature decline sharply does not occur.It is thought that because the contact area between crystallizer protecting residue and molten steel reduces, and tie
Thus the deterioration of brilliant device covering slag is suppressed.
In addition, in the slab by test conticaster production, in the case where the slab produced without using buoying device,
Big vertical surface crackle is generated in the surface of slab, but it is found that the vertical table in the slab produced by using buoying device
Facial cleft line does not occur.This is because the deterioration of crystallizer protecting residue is suppressed, and crystallizer in the work using buoying device
Covering slag is successfully introduced between the inner wall of crystallizer and molten steel, and the generation quilt of the clinker on the inner wall of crystallizer
Inhibit or prevents.
In this way, can pass through when reducing the contact area between crystallizer protecting residue and molten steel by using buoying device
The collection that the Al component in molten steel enters in crystallizer protecting residue is reduced to inhibit the deterioration of crystallizer protecting residue.Therefore, may be used
To inhibit the deterioration of the lubricating action as caused by the deterioration of crystallizer protecting residue and heat transmission function, and high-quality plate can be produced
Base.
Although having described some specific exemplary implementation schemes in the detailed description of present disclosure,
Various modifications can be made to it in the case where not departing from the spirit and scope of present disclosure.Therefore, the scope of the present invention is not
It is limited by detailed description of the invention but is defined by the following claims, and all differences in the range should be explained
To be included in the present invention.
Industrial applicibility
According to some exemplary implementation schemes, during casting, the deterioration of crystallizer protecting residue is suppressed and thus inhibits
The formation of clinker, and it is thus possible to improve slab quality and productivity.
Claims (16)
1. a kind of casting buoying device is being inserted into the molten steel inside crystallizer during casting, the buoying device has than the molten steel
Smaller specific gravity and the bigger specific gravity of the crystallizer protecting residue than being arranged on the molten steel, and include refractory material.
2. casting buoying device according to claim 1, wherein the buoying device includes:
Ontology, the ontology have area more smaller than the bath surface of the molten steel inside the crystallizer；And
Grip part, the grip part are arranged on the upper surface of the ontology.
3. casting buoying device according to claim 2, wherein the ontology is formed as plate.
4. casting buoying device according to claim 2, wherein the ontology is formed to have the box-like of open type lower part.
5. casting buoying device according to claim 2, wherein the ontology is formed to have than inside the crystallizer
The frame-shaped of the smaller size of area of the bath surface of the molten steel.
6. the casting buoying device according to any one of claim 2 to 5, wherein the ontology includes in the side of the ontology
Outwardly projecting protruding portion on surface.
7. casting buoying device according to claim 6, wherein the specific gravity of the buoying device is about 3.0g/cm3To 6.5g/cm3。
8. casting buoying device according to claim 7, wherein the specific gravity of the buoying device is about 3.0g/cm3To 3.2g/cm3。
9. it is according to claim 8 casting use buoying device, wherein the buoying device with a thickness of about 20mm to 50mm.
10. a kind of casting method, comprising:
Molten steel is injected in crystallizer；
By crystallizer protecting residue supply on the molten steel；
Buoying device comprising refractory material is inserted into the top of the molten steel, with thus make at least part of the buoying device with it is described
Steel contacts simultaneously contact at least part with the crystallizer protecting residue；And
By making the molten steel solidification come block,
Wherein in the casting of the slab, the buoying device is used to make the face of the molten steel contacted with the crystallizer protecting residue
Product reduces relative to the area of the bath surface of the molten steel inside the crystallizer.
11. casting method according to claim 10, wherein the buoying device is arranged in for will be described in molten steel injection
Two sides near submersed nozzle in crystallizer.
12. casting method according to claim 11, wherein making the edge of the buoying device in the casting of the slab
Spaced apart from inner walls of at least part relative to the crystallizer.
13. casting method according to claim 12, wherein in the casting of the slab, by the crystallizer protecting residue
It is injected between the buoying device and the inner wall of the crystallizer.
14. casting method according to claim 12, wherein the buoying device is formed to have than inside the crystallizer
The frame-shaped of the smaller size of the area of the bath surface of the molten steel, and include: the firstth area being formed on the inside of the buoying device
Domain；And it is formed in the second area between the buoying device and the inner wall of the crystallizer, wherein the crystallizer protecting residue melted
It is supplied to the first area and the second area.
15. casting method according to claim 12, wherein the buoying device is formed to have than inside the crystallizer
The frame-shaped of the smaller size of area of the bath surface of the molten steel, and include: be formed on the inside of the buoying device
One region；And it is formed in the second area between the buoying device and the inner wall of the crystallizer, wherein the crystallizer of solid phase is protected
Shield slag is supplied to the first area, and the crystallizer protecting residue of melting is supplied to the second area.
16. casting method according to claim 10, wherein the casting of the slab includes the position for measuring the buoying device
To measure the level of the bath surface of the molten steel.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2016-0086981 | 2016-07-08 | ||
| KR1020160086981 | 2016-07-08 | ||
| PCT/KR2016/014020 WO2018008814A1 (en) | 2016-07-08 | 2016-12-01 | Jig for casting and casting method using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109562443A true CN109562443A (en) | 2019-04-02 |
Family
ID=60912215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680088394.8A Pending CN109562443A (en) | 2016-07-08 | 2016-12-01 | Casting buoying device and the casting method for using it |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN109562443A (en) |
| DE (1) | DE112016007049T5 (en) |
| WO (1) | WO2018008814A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112296286A (en) * | 2020-11-03 | 2021-02-02 | 万恩同 | Structure of partition board for continuous casting of molten steel |
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| KR20140080083A (en) * | 2012-12-20 | 2014-06-30 | 주식회사 포스코 | Apparatus for reducing of molten Iron and method for continuous casting for using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5847686B2 (en) * | 2012-10-25 | 2016-01-27 | 株式会社神戸製鋼所 | Method of adding mold flux into continuous casting mold |
| JP5929872B2 (en) * | 2013-10-31 | 2016-06-08 | Ｊｆｅスチール株式会社 | Steel continuous casting method |
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2016
- 2016-12-01 WO PCT/KR2016/014020 patent/WO2018008814A1/en active Application Filing
- 2016-12-01 CN CN201680088394.8A patent/CN109562443A/en active Pending
- 2016-12-01 DE DE112016007049.7T patent/DE112016007049T5/en not_active Withdrawn
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|---|---|---|---|---|
| JPS57202950A (en) * | 1981-06-06 | 1982-12-13 | Nippon Steel Corp | Mold additive for continuous casting |
| JPS6096350A (en) * | 1983-10-31 | 1985-05-29 | Nippon Steel Metal Prod Co Ltd | Floating flask for continuous casting |
| JPH03198953A (en) * | 1989-12-28 | 1991-08-30 | Harima Ceramic Co Ltd | Refractory for removing inclusion in molten steel |
| JPH06297099A (en) * | 1993-04-16 | 1994-10-25 | Arishiumu:Kk | Float type molten metal distributing device for continuous casting metal |
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| KR20110117886A (en) * | 2010-04-22 | 2011-10-28 | 주식회사 포스코 | Carbon heating element for measuring melting characteristics of mold powder and measurement apparatus and measurement method using the same |
| KR20140080083A (en) * | 2012-12-20 | 2014-06-30 | 주식회사 포스코 | Apparatus for reducing of molten Iron and method for continuous casting for using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112296286A (en) * | 2020-11-03 | 2021-02-02 | 万恩同 | Structure of partition board for continuous casting of molten steel |
| CN112296286B (en) * | 2020-11-03 | 2022-06-07 | 万恩同 | Structure of partition board for continuous casting of molten steel |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018008814A1 (en) | 2018-01-11 |
| DE112016007049T5 (en) | 2019-03-28 |
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