CN106694833B - CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag - Google Patents
CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag Download PDFInfo
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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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Abstract
The invention discloses a kind of CSP sheet blank continuous casting medium carbon steel special crystallizer covering slags, belong to covering slag technical field.A kind of CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag, it is characterised in that: its chemical component and its weight percentage are as follows: CaO :≤5%, SiO2: 45% ~ 50%, MgO:5% ~ 10%, Li2O:1% ~ 2.5%, Al2O3: 1% ~ 2%, Na2O:10% ~ 15%, F:10% ~ 16%, C:4% ~ 8%, surplus are inevitable impurity.Covering slag excellent combination property of the present invention, can properly sprawl in crystallizer, and fusing uniformly, forms initial slag blanket-- half molten slag layer of sinter layer-molten slag layer multilayered structure of stable state；The top of the slag is active, and no slag phenomenon occurs；Heat flow curve is stablized, and be poured casting billet surface, subcutaneous and internal soundness are excellent.
Description
Technical field
The invention belongs to covering slag technical fields, and in particular to a kind of CSP sheet blank continuous casting medium carbon steel special crystallizer guarantor
Protect slag.
Background technique
Thin slab continuous casting and rolling CSP (Compact StripProduction) technique is successfully to develop into the end of last century
One abbreviated system of the production hot-rolled sheet coil of function, is that steel and iron industry is most important after oxygen converter steelmaking, continuous-casting steel-making
One of revolutionary technology.Because it has the advantages that small investment, production cost are low, energy consumption is small, it is rapidly developed.
Compared with reheating the technique rolled again after traditional heavy slab is cooling, there is the CSP hot-rolled steel with sample ingredient
Plate experienced different hot procedures.But in process of production, CSP hot rolled coil surface and built in problem frequency are existing, affect
The exploitation of related kind.CSP hot rolled steel plate is produced by one soaking of sheet blank continuous casting, one tandem rolling, one curling process, continuous casting billet
Not through being subcooling to the process of room temperature reheating, the sheet billet with solidified structure state is direct after about 1100 DEG C of soaking
It is rolled, and uses bigger percentage pass reduction during the rolling process；The setting time of sheet billet is shorter, cold after solidification
But rate is higher；Continuous casting billet strip is rapidly cooled after rolling.These technologic difference are to CSP medium carbon steel production board
Tissue and performance generation significantly affect.
It is known that CSP continuous casting drawing speed is fast, the consumption of covering slag is few, and the thickness and uniformity fluctuations of slag film are big,
Than more serious, field trash floats difficult in crystallizer and is set in slab slag.Crystallizer steel -passing amount is big, and in crystallizer
Molten bath area is small, and molten steel jet intensity causes greatly molten steel in mold liquid fluctuating violent.Thin-slab caster has stronger
Intensity of cooling, liquid level temperature is low in crystallizer, easily causes slugging bad.Sheet blank continuous casting pulling rate variation range is wide, and amplitude is big, right
Mold flux property is also easy to produce adverse effect in crystallizer, and covering slag should have wider adaptability, the use of funnel-type crystallizer
Slab is set to have biggish geometric deformation along wide face horizontal direction in process of setting, resistance of billet withdrawal is big, to the lubricity of covering slag
There can be higher requirement.
Currently, CSP medium carbon steel is widely used in automobile, food and household electric appliances, the quality of Yao Tigao deep-drawing sheet passes through
The degree of purity of molten steel is improved, the field trash reduced in molten steel is very effective means.Since thin-slab caster pulling rate is very fast,
Liquid level fluctuation of crystallizer is big, and than more serious, field trash floats difficult in crystallizer and is set in slab slag.Therefore, such as
Stability, the adaptability of what raising covering slag are the key means that continuous crystallizer protecting slag solves problems.
For the continuous casting of such steel grade, domestic crystallizer protecting residue product relies primarily on import at present, exists and asks
Topic is: 1) most domestic steel mill generallys use the conventional guarantor close with carbon amounts steel, process conditions when such slab is cast
Shield slag is cast, and Special slag is not used；2) though partial domestic covering slag is designed for such concrete technology condition,
Main to be imitated by the domestic close product of combination, mature technology, does not cause the one-time success rate in test low, slab
Surface quality is poor；3) domestic slag due to the technique of use it is not perfect, bits performance inconsistency is big, so causing use process unstable
The defects of easily causing crackle, slag inclusion generation.
(application of the wine steel CSP technique medium carbon steel crystallizer protecting residue such as Wang Yonghong and optimization [J] steel are ground Wang Yonghong etc.
Study carefully, 2010,38:194-196) to describe wine steel CSP in national thin plate broadband production technology information fair in 2010 thin
Slab caster is optimized with covering slag and development, passes through pair to imported relay slag and domestic covering slag use and performance
Than CSP medium carbon steel covering slag current to wine steel carries out performance optimization, develops suitable wine steel CSP thin-slab caster medium carbon steel
The high-quality domestic covering slag of production, sheet billet Longitudinal Surface Cracks incidence drop to 0.5% by 5%, are CSP sheet blank continuous casting medium carbon steel
The research and development of crystallizer protecting residue provides important Technical Reference.Application No. is 201310691718.5 Chinese patents
Disclose a kind of crystallizer protecting residue of high pulling rate sheet blank continuous casting, chemical analysis weight percentage are as follows: CaO34~
44%, Al2O32~8%, SiO220~30%, MgO1~9%, F5~15%, Na2O≤6.5%, K2O≤5%, Li2O≤
6%, surplus carbon and uncontrollable impurity.CaO high, SiO in the covering slag2It is low, the degree of purity of molten steel can be improved；Fusion temperature
It is low, play fluxing effect, it is possible to reduce the usage amount of fluxing agent reduces the precipitation possibility of various crystal, to improve
Covering slag it is glassy, make covering slag under high pulling rate have good lubricating action；Appropriate Al2O3Improve lubrication.The covering slag
It is able to satisfy the medium carbon steel kind continuous casting process requirement such as SS400, Q345.Above-mentioned covering slag all has good meltdown property, suitable
Basicity and viscosity, it is ensured that the greasy property of covering slag meets the requirement of technique direct motion, but is easy to appear liquid level slag, so that casting
There is dry slag to base surface imperfection, to influence Surface Quality of Steel Billet, even result in bleed-out, affects CSP sheet blank continuous casting
The production of medium carbon steel.
Summary of the invention
In view of this, technical problem to be solved by the invention is to provide a kind of dedicated knots of CSP sheet blank continuous casting medium carbon steel
Brilliant device covering slag, to reduce the incidence on CSP hot rolled coil surface and inherent quality problem, while the direct motion for reaching continuous casting process is wanted
It asks.
In order to solve the above technical problems, the technical scheme adopted by the invention is that:
A kind of CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag, chemical component and its weight percentage are as follows:
CaO :≤5%, SiO2: 45%~50%, MgO:5%~10%, Li2O:1%~2.5%, Al2O3: 1%~2%, Na2O:
10%~15%, F:10%~16%, C:4%~8%, surplus are inevitable impurity；
The CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag, is prepared by the raw material of following parts by weight:
60~65 parts of pre- melt, quartzy 6~10 parts, 2~3 parts of bauxite, 12~15 parts of fluorite, 1~2 part of lithium carbonate, ice crystal 8~10
Part, 3~5 parts of carbon materials, 1~2 part of bentonite；
The preparation method of the CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag, comprising the following steps:
Step S1: prepare pre- melt, quartz, bauxite, fluorite, lithium carbonate, ice crystal, powder by above-mentioned weight
It is broken, 100 mesh are crossed with upper screen cloth；
Step S2: greater than 200 DEG C of covering slag fusion temperature or more at a temperature of use lining-less water cooled furnace wall furnace melting,
Obtain slag；
Step S3: the slag is directly entered room temperature pond cooled and solidified into vitreum；
Step S4: step S3 resulting materials are dried to water content less than 2wt%；
Step S5: step S4 resulting materials are crushed, and the granularity of gained powder is by 200 mesh with the screenings of upper screen cloth
Content is at least up to 80%；
Step S6: being added carbon materials, is uniformly mixed；
Step S7: step S6 resulting materials are gasified in proportion into feed bin, with every barrel of progress Microcomputerized dosing of 6t, reenter stirring
Machine stirring, takes semi-finished product to detect, and after qualification, bentonite is added, and enters ball mill dry grinding, reenters that levigator is levigate and pulping, mentions
Material makes material by spraying, and product testing, qualified product is packed and stored.
Further, the CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag, chemical component and its weight hundred
Divide content are as follows: CaO:2.5%~4.5%, SiO2: 45%~50%, MgO:8%~10%, Li2O:1%~2%, Al2O3:
1%~2%, Na2O:12%~15%, F:13%~16%, C:6%~8%, surplus are inevitable impurity.
Further, value≤0.1 basicity R of the CSP medium carbon steel continuous crystallizer protecting slag.
Further, the fusing point of the CSP medium carbon steel continuous crystallizer protecting slag is 1000 DEG C~1050 DEG C.
Further, CSP medium carbon steel continuous crystallizer protecting slag viscosity at 1300 DEG C is 0.1~0.3Pa
s。
Further, the chemical component and mass percentage of the pre- melt are as follows: SiO245~48%, CaO3~5%,
R2O8~12%, F8~12%, MgO5~8%, wherein R is alkali metal element.
Further, the carbon materials are carbon black and/or graphite, and the weight ratio of the carbon black and graphite is 1:1.
Compared with prior art, it mentality of designing of the invention and has the beneficial effect that:
CSP medium carbon steel is easy to appear dystectic oxide and is mingled with, lead to cc billet surface quality occur in continuous casting process
Problem.Sheet billet is more stringent to the Composition Control of inclusion content in melting steel due to its unique production technology, it is desirable that in Calcium treatment
Major part A1 in the process2O3The CaO-Al of good fluidity can be changed into2O3, while not generating solid CaS again.In addition, covering slag
SiO in consumption process in slag2It can be reacted with the strong reducing property metallic element chemically reactive in molten steel in desulphurization
The result is that strong reducing property element becomes to be not easy to react oxide and enters slag, Si enters molten steel, and covering slag is in molten steel
Strong reducing property metallic element premature oxidation is adsorbed in slag, ensure that the degree of purity of molten steel.But adsorbed in covering slag compared with
It is more be mingled with after, cause covering slag to deteriorate quickly, greatly improve the fusing point and viscosity of covering slag, slag cannot be balancedly
It flows between crystallizer and slab, causes continuous casting that cannot go on.
It the defects of in order to guarantee that the absorption of continuous crystallizer protecting slag is mingled with ability, prevent slag, crackle, protects simultaneously
Demonstrate,prove covering slag has good service performance after having adsorbed more field trash, as SiO in raising covering slag2Content, subtract
Few CaO and Al2O3Content, reduce the basicity and viscosity of continuous crystallizer protecting slag, meet continuous casting needs, and drawing
Speed is still able to satisfy the technique requirement of CSP sheet blank continuous casting medium carbon steel higher than (5.0~5.5m/min) under conditions of 5.0m/min.
Covering slag of the present invention is after having adsorbed more field trash and having met the requirement of Molten Steel Cleanliness, covering slag invariance,
Guarantee the direct motion of continuous casting.Melt cinder can uniformly, appropriately flow into the gap between slab and crystallizer wall, improve slab matter
Amount.
To realize that above-mentioned function, the main performance index design of covering slag of the present invention see the table below:
| Basicity (R) | Fusing point/DEG C | Viscosity/PaS | Burn-off rate/s |
| < 0.1 | 1000~1050 | 0.1~0.3 | 40~50 |
1) burn-off rate: the main reason for known covering slag causes bonding steel leakage first is that, covering slag burn-off rate is excessively slow,
It is too small (< 8mm) to cause covering slag liquid slag layer thickness, to cause between copper wall and green shell local slag bad, leads to green shell
It lubricates bad and is bonded on copper sheet and generates bleed-out.And protect slag melting point lower, burn-off rate is faster, and the thickness of liquid slag layer is got over
Thickness is conducive to green shell lubrication in this way.However under the conditions of high pulling rate (3.5~5.5m/min), the fusing thickness of covering slag to
Meet the depletion rate of covering slag, it is necessary to which low viscosity number increases slag consumption.In production practices, design protection slag of the present invention
Burn-off rate be 40~50s, it is relatively conventional slow to melt speed, but be equipped with the indexs such as suitable fusing point and viscosity, reach and meet this hair
The related request of bright technique direct motion.
2) viscosity: viscosity (1300 DEG C) is to indicate the physical index of the micro- substance locomotivity size of structure in slag, refers to liquid
The size of body slag intermolecular inherent frictional force of each slag blanket when mobile.The viscosity of covering slag is too low, and slag consumption is excessive, slab oscillation mark
It is deep, cause slag film to thicken and unevenly, slab is easy to produce crackle；Viscosity is excessively high to make the reduction of slag consumption, cause slag film thinning,
Even part green shell cannot adequately lubricate, and easily cause the shallow disorder of oscillation mark and distortion induces the subcutaneous micro-crack of slab or even leads
Cause bonding steel leakage accident.It is existing research (He Daozhong, week book, the Beijing Xiao Hongguang continuous casting steel machine [M]: metallurgical industry publishing house,
2007:127~130.) show: in order to obtain stable heat transfer, there is the relationship to match between the viscosity and pulling rate of slag.So
And during production practices, since the performance of covering slag performance is influenced by factors, theoretically viscosity and pulling rate it
Between matching relationship suffer from limitation in practice.Design viscosity value of the present invention be 0.1~0.3Pas, preferably 0.1~
0.2Pas meets slag consumption and reduces and even avoid the generation of slab quality problem while require, and is higher than in pulling rate
It still is able to better meet technique requirement, significant effect when 5.0m/min.
3) basicity: basicity [R=w (CaO)/w (SiO2)] it is to reflect that covering slag absorbs the important of inclusion content in melting steel ability
Index, while can also reflect the superiority and inferiority of covering slag greasy property.In general, basicity is high, it is stronger to absorb the ability being mingled with, but crystallization temperature
Degree is got higher, and is unfavorable for lubricating and be conducted heat.The present invention determines as basicity < 0.1 by optimization composition proportion, can reach absorption
The technique requirement being mingled with, and it is able to achieve green shell lubrication, reduce the generation for the defects of even preventing slag and crackle.
4) fusing point: the fusion temperature of existing research covering slag, which absorbs field trash ability and lubricating action to slag, larger shadow
It rings.Accomplish that the ability for making covering slag have dross inclusion adsorption is not so difficult at present, and it is difficult after covering slag absorbs a large amount of field trashes,
It is able to maintain good performance, also to meet the requirement of continuous casting process, especially greasy property and uniformly transfer heat performance.Therefore for reality
Show liquid slag film to the good absorption of floating field trash, and after the liquid slag film absorbs the field trash to float, covering slag
Physical and chemical index is relatively stable.Through determining, when the fusing point of covering slag is within the scope of 1000~1050 DEG C, guarantor can be significantly improved
Thermal stability and chemical stability of the slag in melting process are protected, is had in medium carbon steel CSP sheet blank continuous casting process to realize
Standby good absorption is mingled with performance and its uniformly transfer heat performance.
In addition, CSP sheet blank continuous casting is since slab is thin, molten steel is small with a distance from crystallizer wall, while molten steel is in crystallizer
The large specific surface area of interior Unit Weight, therefore its heat dissipation capacity is more much bigger than conventional continuous casting, thus adiabatic heat insulating effect requires more
Strictly.The low bulk density of covering slag (bulk density) is the key that the adiabatic heat insulating effect obtained.But too low bulk density
It will lead to slag to slow.Therefore covering slag bulk density of the present invention is designed as 0.75~0.85g/cm3.Also, considering to hold
Again etc. on the basis of parameters, adjusting component proportion makes the control of its slag consumption in 0.6~0.7kg/t, and it is high effectively to meet CSP sheet billet
The requirement of fast continuous casting.
According to above-mentioned mentality of designing and practical studies, designed covering slag excellent combination property can be suitable in crystallizer
It sprawls, fusing uniformly, forms initial slag blanket-- half molten slag layer of sinter layer-molten slag layer multilayered structure of stable state；The top of the slag is living
Jump, no slag phenomenon occur；Heat flow curve is stablized, and be poured casting billet surface, subcutaneous and internal soundness are excellent.
Specific embodiment
For a better understanding of the present invention, the contents of the present invention, but this hair are further fairly set out below with reference to embodiment
Bright protection content is not limited solely to the following examples.In the following description, give a large amount of concrete details so as to
More thorough understanding of the invention is provided.It will be apparent, however, to one skilled in the art that the present invention can be with
It is carried out without one or more of these details.
Embodiment 1
CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag of the present invention, is prepared by the raw material of following parts by weight:
60 parts of pre- melt, quartzy 6 parts, 2 parts of bauxite, 12 parts of fluorite, 1 part of lithium carbonate, 8 parts of ice crystal, 3 parts of carbon materials, bentonite 1
Part, wherein the chemical component and mass percentage of the pre- melt are as follows: SiO246%, CaO3%, R2O8%, F9%,
MgO7%, wherein R is alkali metal element.
Carbon materials described in the present embodiment are carbon black and graphite, and the weight ratio of the carbon black and graphite is 1:1.
The preparation method of the above-mentioned CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag of the present invention, comprising the following steps:
Step S1: prepare pre- melt, quartz, bauxite, fluorite, lithium carbonate, ice crystal by above-mentioned weight, crush, cross 100 mesh
With upper screen cloth；
Step S2: greater than 200 DEG C of covering slag fusion temperature or more at a temperature of use lining-less water cooled furnace wall furnace melting,
Obtain slag；
Step S3: the slag is directly entered room temperature pond cooled and solidified into vitreum；
Step S4: step S3 resulting materials are dried to water content less than 2wt%；
Step S5: step S4 resulting materials are crushed, and the granularity of gained powder is by 200 mesh with the screenings of upper screen cloth
Content is at least up to 80%；
Step S6: being added carbon materials, is uniformly mixed；
Step S7: step S6 resulting materials are gasified in proportion into feed bin, with every barrel of progress Microcomputerized dosing of 6t, reenter stirring
Machine stirring, takes semi-finished product to detect, and after qualification, bentonite is added, and enters ball mill dry grinding, reenters that levigator is levigate and pulping, mentions
Material makes material by spraying, and product testing, qualified product is packed and stored.
Embodiment 2
CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag of the present invention, is prepared by the raw material of following parts by weight:
65 parts of pre- melt, quartzy 9 parts, 3 parts of bauxite, 14 parts of fluorite, 2 parts of lithium carbonate, 9 parts of ice crystal, 4 parts of carbon materials, bentonite 2
Part, wherein the chemical component and mass percentage of the pre- melt are as follows: SiO245%, CaO5%, R2O10%, F8%,
MgO7%, wherein R is alkali metal element.
Carbon materials described in the present embodiment are carbon black and graphite, and the weight ratio of the carbon black and graphite is 1:1.
The present invention also provides the preparation method of above-mentioned CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag, refering to
Embodiment 1, repeats no more.
Embodiment 3
CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag of the present invention, is prepared by the raw material of following parts by weight:
62 parts of pre- melt, quartzy 8 parts, 2 parts of bauxite, 15 parts of fluorite, 2 parts of lithium carbonate, 10 parts of ice crystal, 5 parts of carbon materials, bentonite
2 parts, wherein the chemical component and mass percentage of the pre- melt are as follows: SiO246%, CaO3%, R2O12%, F10%,
MgO6%, wherein R is alkali metal element.
Carbon materials described in the present embodiment are carbon black and graphite, and the weight ratio of the carbon black and graphite is 1:1.
The present invention also provides the preparation method of above-mentioned CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag, refering to
Embodiment 1, repeats no more.
Embodiment 4
CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag of the present invention, is prepared by the raw material of following parts by weight:
64 parts of pre- melt, quartzy 10 parts, 3 parts of bauxite, 15 parts of fluorite, 2 parts of lithium carbonate, 9 parts of ice crystal, 5 parts of carbon materials, bentonite
1 part, wherein the chemical component and mass percentage of the pre- melt are as follows: SiO248%, CaO5%, R2O9%, F12%,
MgO8%, wherein R is alkali metal element.
Carbon materials described in the present embodiment are carbon black and graphite, and the weight ratio of the carbon black and graphite is 1:1.
Embodiment 5
CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag of the present invention, is prepared by the raw material of following parts by weight:
65 parts of pre- melt, quartzy 8 parts, 2 parts of bauxite, 14 parts of fluorite, 2 parts of lithium carbonate, 10 parts of ice crystal, 4 parts of carbon materials, bentonite
2 parts, wherein the chemical component and mass percentage of the pre- melt are as follows: SiO248%, CaO5%, R2O10%, F10%,
MgO7%, wherein R is alkali metal element.
Carbon materials described in the present embodiment are carbon black.
Embodiment 6
CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag of the present invention, is prepared by the raw material of following parts by weight:
60 parts of pre- melt, quartzy 6 parts, 2 parts of bauxite, 13 parts of fluorite, 1 part of lithium carbonate, 9 parts of ice crystal, 4 parts of carbon materials, bentonite 2
Part, wherein the chemical component and mass percentage of the pre- melt are as follows: SiO247%, CaO4%, R2O10%, F9%,
MgO7%, wherein R is alkali metal element.
Carbon materials described in the present embodiment are graphite.
Embodiment 7
CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag of the present invention, is prepared by the raw material of following parts by weight:
62 parts of pre- melt, quartzy 8 parts, 3 parts of bauxite, 12 parts of fluorite, 1 part of lithium carbonate, 9 parts of ice crystal, 4 parts of carbon materials, bentonite 2
Part, wherein the chemical component and mass percentage of the pre- melt are as follows: SiO248%, CaO4%, R2O9%, F10%,
MgO6%, wherein R is alkali metal element.
Carbon materials described in the present embodiment are carbon black.
Embodiment 8
CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag of the present invention, is prepared by the raw material of following parts by weight:
65 parts of pre- melt, quartzy 8 parts, 3 parts of bauxite, 15 parts of fluorite, 2 parts of lithium carbonate, 10 parts of ice crystal, 5 parts of carbon materials, bentonite
2 parts, wherein the chemical component and mass percentage of the pre- melt are as follows: SiO246%, CaO5%, R2O12%, F10%,
MgO8%, wherein R is alkali metal element.
Carbon materials described in the present embodiment are graphite.
The above-mentioned CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag of the present invention, chemical component and its weight percent
Content are as follows: CaO :≤5%, SiO2: 45%~50%, MgO:5%~10%, Li2O:1%~2.5%, Al2O3: 1%~2%,
Na2O:10%~15%, F:10%~16%, C:4%~8%, surplus are inevitable impurity.The following table 1 lists implementation
The chemical component and its weight percent of 1~8 gained CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag of example are as follows:
The chemical component and its weight percent of table 1CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag
The physical and chemical index of function protective material obtained by Examples 1 to 8 is shown in Table 2:
The physical and chemical index of table 2CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag
Covering slag of the present invention is practiced in steel mill, our company:
CSP conticaster casting section: 150-180mm × 1280-1500mm, production medium carbon steel carbon mass fraction are 0.3%-
0.4%, pulling speed of continuous casting is 4.5~5.5m/min.Observation: uniformly, it is suitable to sprawl for covering slag fusing.Liquid slag layer thickness is maintained at 10
It~15 millimeters, fluctuates small.In continuous casting process, slag phenomenon incidence is zero.Gained casting billet surface is smooth, and flawless, slag group lack
It falls into.The ton steel consumption quantity of slag is stablized in 0.6~0.7kg, and fluctuation is small, meets slab quality and technique direct motion requirement.From in October, 2015
So far, the average qualification rate of slab reaches 99.99%, and bleed-out incidence is zero for operation.
Comparative example covering slag physicochemical property done in research process of the present invention, is shown in Table 3:
3 covering slag physicochemical property of table
Above-mentioned covering slag is used for CSP sheet blank continuous casting medium carbon steel, CSP conticaster casting section: 150-180mm ×
1280-1500mm, production medium carbon steel carbon mass fraction be 0.3%-0.4%, pulling speed of continuous casting be 4.5~5.5m/min, observation and
Testing result such as table 4:
The observation of table 4 and testing result
In addition, the present invention is also measured the phosphorus content of 1~5 gained slab medium carbon steel of Examples 1 to 8 and comparative example,
As a result such as table 5.
Phosphorus content and dephosphorization rate compare in 5 medium carbon steel of table
Note: dephosphorization rate=(experimental group-blank group)/blank group * 100%.
As shown in Table 5, blank group is compared, after covering slag, phosphorus content is substantially reduced in finished steel.Examples 1 to 8 is protected
The dephosphorization rate for protecting slag is 91.0~94.4%, and the dephosphorization rate of 1 covering slag of comparative example is 58.3%, the dephosphorization of 2 covering slag of comparative example
Rate is 62.5%, and the dephosphorization rate of 3 covering slag of comparative example is 52.8%, and the dephosphorization rate of 4 covering slag of comparative example is 43.1%, comparative example
The dephosphorization rate of 5 covering slags is 63.9%.Above-mentioned data show, each ingredient coordinated of covering slag of the present invention, so that dephosphorization effect
More significant, dephosphorization efficiency is more preferable, illustrates that covering slag of the present invention has stronger dephosphorization effect.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, this field is common
Other modifications or equivalent replacement that technical staff makes technical solution of the present invention, without departing from technical solution of the present invention
Spirit and scope, be intended to be within the scope of the claims of the invention.
Claims (7)
1. a kind of CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag, it is characterised in that: its chemical component and its weight
Percentage composition are as follows: CaO :≤5%, SiO2: 45% ~ 50%, MgO:5% ~ 10%, Li2O:1% ~ 2.5%, Al2O3: 1% ~ 2%, Na2O:10% ~
15%, F:10% ~ 16%, C:4% ~ 8%, surplus are inevitable impurity；
The CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag, is prepared: fritting by the raw material of following parts by weight
60 ~ 65 parts of material, quartzy 6 ~ 10 parts, 2 ~ 3 parts of bauxite, 12 ~ 15 parts of fluorite, 1 ~ 2 part of lithium carbonate, 8 ~ 10 parts of ice crystal, carbon material
3 ~ 5 parts, 1 ~ 2 part of bentonite of material；
The preparation method of the CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag, comprising the following steps:
Step S1: prepare pre- melt, quartz, bauxite, fluorite, lithium carbonate, ice crystal by above-mentioned weight, crush, mistake
100 mesh are with upper screen cloth；
Step S2: greater than 200 DEG C of covering slag fusion temperature or more at a temperature of use lining-less water cooled furnace wall furnace melting, obtain
Slag；
Step S3: the slag is directly entered room temperature pond cooled and solidified into vitreum；
Step S4: step S3 resulting materials are dried to water content less than 2wt%；
Step S5: step S4 resulting materials are crushed, and the granularity of gained powder is by 200 mesh with the screenings content of upper screen cloth
At least up to 80%；
Step S6: being added carbon materials, is uniformly mixed；
Step S7: step S6 resulting materials are gasified in proportion into feed bin, with every barrel of progress Microcomputerized dosing of 6t, blender is reentered and stirs
It mixes, semi-finished product is taken to detect, after qualification, bentonite is added, enter ball mill dry grinding, reenter that levigator is levigate and pulping, propose material spray
Mist makes material, and product testing, qualified product is packed and stored.
2. CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag as described in claim 1, it is characterised in that: the CSP
Sheet blank continuous casting medium carbon steel special crystallizer covering slag, chemical component and its weight percentage are as follows: CaO:2.5% ~ 4.5%,
SiO2: 45% ~ 50%, MgO:8% ~ 10%, Li2O:1% ~ 2%, Al2O3: 1% ~ 2%, Na2O:12% ~ 15%, F:13% ~ 16%, C:6% ~ 8%,
Surplus is inevitable impurity.
3. CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag as described in claim 1, it is characterised in that: the CSP
Value≤0.1 basicity R of medium carbon steel continuous crystallizer protecting slag.
4. CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag as described in claim 1, it is characterised in that: the CSP
The fusing point of medium carbon steel continuous crystallizer protecting slag is 1000 DEG C ~ 1050 DEG C.
5. CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag as described in claim 1, it is characterised in that: the CSP
Medium carbon steel continuous crystallizer protecting slag viscosity at 1300 DEG C is 0.1 ~ 0.3Pas.
6. CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag as described in claim 1, it is characterised in that: described pre-
The chemical component and mass percentage of melt are as follows: SiO245~48%、CaO3~5%、R2O8 ~ 12%, F8 ~ 12%, MgO5 ~ 8%, wherein
R is alkali metal element.
7. CSP sheet blank continuous casting medium carbon steel special crystallizer covering slag as claimed in claim 6, it is characterised in that: the carbon
Cellulosic material is carbon black and/or graphite, and the weight ratio of the carbon black and graphite is 1:1.
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| CN1131118C (en) * | 2000-04-30 | 2003-12-17 | 钢铁研究总院 | Protective scoria for continuous casting of ultralow carbon steel |
| CN1192834C (en) * | 2001-10-16 | 2005-03-16 | 广州珠江钢铁有限责任公司 | Protective slag for CSP thin plate blank continuously-casting crystallizer |
| CN100584487C (en) * | 2008-01-08 | 2010-01-27 | 河南通宇冶材集团有限公司 | Preparation Preliminary melting type continuous casting crystallizer protecting slag |
| CN101637808B (en) * | 2009-08-11 | 2012-03-07 | 河南省西保冶材集团有限公司 | ASP medium thickness slab high drawing speed plate blank low-carbon steel continuous casting functional protective material |
| CN102554162B (en) * | 2011-12-31 | 2014-07-09 | 西峡龙成冶金材料有限公司 | Slab continuous casting mold covering slag and production method thereof |
| CN102728797A (en) * | 2012-06-15 | 2012-10-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Crystallizer protective slag for effectively controlling carbon steel cracks in compact strip production (CSP) |
| CN102764866B (en) * | 2012-07-20 | 2014-01-29 | 钢铁研究总院 | High-Al2O3 content high-aluminum steel continuous casting slag powder |
| CN103008590A (en) * | 2012-12-08 | 2013-04-03 | 内蒙古包钢钢联股份有限公司 | Continuous casting mold covering slag for medium carbon steel containing manganese |
| CN105414505A (en) * | 2015-12-18 | 2016-03-23 | 河南省西保冶材集团有限公司 | Special covering slag for auto sheet CSP sheet billet |
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