CN107282903B - A kind of continuous super low carbon steel casting crystallizer protecting residue - Google Patents
A kind of continuous super low carbon steel casting crystallizer protecting residue Download PDFInfo
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- CN107282903B CN107282903B CN201611253209.4A CN201611253209A CN107282903B CN 107282903 B CN107282903 B CN 107282903B CN 201611253209 A CN201611253209 A CN 201611253209A CN 107282903 B CN107282903 B CN 107282903B
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- slag
- carbon steel
- low carbon
- super low
- covering slag
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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
Abstract
The invention belongs to steelmaking technical fields, and in particular to a kind of continuous super low carbon steel casting crystallizer protecting residue, chemical component and its weight percentage are as follows: CaO 35%~43%, SiO240%~51%, MgO 1%~3%, Al2O34.0%~6.0%, Na2O 3%~5%, F‑2%~4% and CGu1%~2%.Covering slag of the present invention is while not only guaranteeing insulation effect, but also keeps suitable burn-off rate, and gained casting billet surface is smooth, oscillation mark is regular, shallower, and without slag, rimhole and other issues is added, carbon content does not increase in slab.
Description
Technical field
The invention belongs to steelmaking technical fields, and in particular to a kind of continuous super low carbon steel casting crystallizer protecting residue.
Background technique
Ultra-low-carbon steel refers to phosphorus content below 0.003% for cold-rolled steel, it is important to after the level and refining of decarburization extremely
Continuous casting at base during prevent molten steel recarburization, covering slag plays a crucial role on continuous casting process, existing refining
The covering slag of steel continuous casting usually contains CaO, SiO2、Al2O3The raw mineral materials composition of equal oxides, is added and contains Na, F
It waits the fluxing agent of elements to adjust fusing point, the viscosity of covering slag, then is incorporated a certain number of carbon materials and exists to control covering slag
Burn-off rate on crystallizer molten steel face.Covering slag forms molten slag layer, sinter layer, slag layer from bottom to top on molten steel face, tool
Have following effect: slag layer plays insulation effect；Molten slag layer can completely cut off air and avoid molten steel oxidation；Slag is absorbed and is dissolved in molten steel
The field trash of floating；Slag, which flows between crystallizer and slab, forms slag film lubricating action, passes through the ingredient for changing covering slag
The crystallinity of Properties Control slag film changes the thermal resistance of slag film, heat transfer of the slab to crystallizer is controlled, to control the initial of slab
Process of setting.But covering slag is in actual use, the control of covering slag burn-off rate is not stringent, and casting billet surface usually has
Defect.
Chinese patent CN103817301B discloses a kind of continuous crystallizer protecting slag for ultra-low-carbon steel, by
Active carbon is added in covering slag, can not only be allowed air to by protecting slag blanket that carbon rapid oxidation is made to produce carbon dioxide
Gas discharge, and itself have powerful adsorption function, portion of air is stored to accelerate oxidation rate, so that
Carbon is removed rapidly after guaranteeing that covering slag melts rapidly, so that covering slag is not carbon containing, prevents ultra-low-carbon steel from increasing from source by it
The generation of carbon phenomenon；After active carbon rapid oxidation, due to active carbon consumption so that gap disappear, covering slag can rapidly by
Steel billet seals off air, prevents steel billet re-oxidation.But the patent fixed carbon is oxidized to carbon dioxide gas evolution,
Covering slag heat insulation effect is poor, molten speed is too fast, causes molten slag layer blocked up, and molten slag layer has little time to consume, and molten slag layer can enter in molten steel,
The subcutaneous slag inclusion of slab is caused, casting billet surface is defective.
Chinese patent CN101530896B discloses a kind of high casting speed continuous casting covering slag used for ultra-low-carbon steel, including pre- melt and
Ingredient, the chemical component per distribution ratio of pre- melt are as follows: CaO:30~40%, SiO2: 35~45%, Al2O3: 3~10%, MgO:1
~5%, F:4~8%, Na2O:6~12%, B2O3: 0.5~3%, remaining is the trace impurity that raw material is brought into, the alkali of pre- melt
Spend CaO/SiO2It is 0.70~1.05, viscosity is 0.2~0.5Pa.s, and pre- melt is handled through fritting；Ingredient are as follows: addition 0.7
~0.9% simple substance carbon；Add boron flame retardant, wherein small part be incorporated in the form of borax, additional amount for 0.25~
1.5%；Remaining most of boron based material is fused in advance in fritting material, B in slag after fritting2O3Content be 0.5~3%.It is described to match
Material further include: the CaSi powder of addition 0.2~0.8%, 0.8~4.0% manganese ore.But the patent is delayed using fire retardant
The oxidation rate of carbon in covering slag reduces the additional amount of carbon in covering slag, but the reduction of its phosphorus content will cause burn-off rate
It is too fast, cause molten slag layer blocked up, molten slag layer has little time to consume, and molten slag layer can enter in molten steel, causes the subcutaneous slag inclusion of slab, slab
Surface is defective.
Summary of the invention
To overcome drawbacks described above, the purpose of the present invention is to provide a kind of continuous super low carbon steel casting crystallizer protecting residues.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of continuous super low carbon steel casting crystallizer protecting residue, chemical component and its weight percentage are as follows: CaO 35%
~43%, SiO240%~51%, MgO 1%~3%, Al2O34.0%~6.0%, Na2O 3%~5%, F-2%~4% and CGu1%
~2%.
Preferably, the dual alkalinity of the covering slag is 0.74~0.95.
Preferably, 1100 DEG C ~ 1150 DEG C of the fusing point of the covering slag, viscosity is 0.25 ~ 0.45Pas at 1300 DEG C, is melted
Change 30~40s of speed.
Preferably, the covering slag is made of the raw material of following weight percent: pre- melt 55%~60%, wollastonite 6%~
10%, ice crystal 5%~10%, fluorite 13%~16%, bauxite 4%~6%, glass powder 1%~3%, magnesia 2%~4%, carbon black 2%~
4% and adhesive 2%~4%.
Preferably, the pre- melt includes that the raw material of following weight percent is made: SiO2 35.0~45.0%, CaO
40.0~45.0%, Al2O3 3.0~6.0%, Na2O 2.0~5.0%, MgO 3.0~6.0% and F-5%~8%.
Preferably, described adhesive is sodium carboxymethylcellulose and/or sodium lignin sulfonate.
Preferably, described adhesive is sodium carboxymethylcellulose and sodium lignin sulfonate, and the two weight ratio is 1:1~3.
Preferably, above-mentioned continuous super low carbon steel casting crystallizer protecting residue preparation method the following steps are included:
(1) ingredient: prepare various raw materials by above-mentioned chemical component and its weight percentage；
(2) it melts: with various raw materials of the furnace melting in addition to carbonaceous material, adhesive；
(3) water quenching: the slag for melting out is directly entered pond cooled and solidified into vitreum；
(4) dry: vitreum is dried to water content≤2%；
(5) it crushes: vitreum is crushed to powder size >=200 mesh；
(6) it prepares: carbonaceous material and adhesive being added in step (5) powder；
(7) mist projection granulating: step (6) various raw materials are stirred evenly in blender, successively enter ball mill dry grinding, levigator
Levigate and pulping, mist projection granulating to get.
1. the basicity of covering slag is by CaO and SiO2Ratio determine that basicity is too high, it is stronger to absorb the ability being mingled with,
But crystallization temperature is got higher, and is unfavorable for lubricating and be conducted heat, and the basicity of covering slag of the present invention is that can reach suction between 0.74~0.95
The attached technique requirement being mingled with, and it is able to achieve green shell lubrication and heat transfer, reduce the generation for the defects of even preventing slag and crackle.
Excessively high CaO will make covering slag primary crystallization hyperenergia, improve the crystallization temperature of covering slag, to a certain extent
Deteriorate lubrication, present invention determine that CaO weight percentage is 35%~43%.SiO2It is that network structure important in covering slag is formed
Body reacts with basic anhydride and generates low-melting compound, reduces the fusing point of covering slag, can control slag by its additional amount
Fusing point and crystal property.Certain SiO2Be conducive to that the thickness of melt cinder film near meniscus is made to maintain certain level, improve
Lubrication.But excessively high SiO2It is easy the crystal property of reduction covering slag, present invention determine that SiO2Weight percentage be
SiO240%~51%.
2. MgO belongs to alkaline metal oxide, part CaO can be substituted in covering slag, can also improve the lubrication of covering slag
Performance.But since the fusing point of MgO itself is relatively high, and be easy with other compositions in conjunction with generation high melting compound, content compared with
The transition temperature of slag can be promoted when high, deteriorate slab lubrication.MgO weight percentage of the present invention is 1%~3%.
Al2O3Belong to amphoteric oxide, the field trash in adsorbable molten steel.Al2O3Viscosity, crystallization tendency to covering slag
Bigger, too high levels are influenced, is easy to increase the viscosity of slag, is unfavorable for lubricating.Al of the present invention2O3Weight percentage is 4%
~6%.
3. Na2O: sodium carbonate material in covering slag, Na are mainly derived from2O fusing point is 920 DEG C, belongs to network outer body oxidation
Object can destroy silicate network structure, the effect of landing low melting point and viscosity in covering slag.Na of the present invention2O weight percent contains
Amount 3~5%.
F-: it is mainly derived from fluorite material in covering slag, suitable F in slag-Ion can make silicon oxygen condensate disintegrate.It will
It, which is controlled, can significantly reduce the viscosity of slag 2~4%, and will not influence the glassy of slag.
4. CGuThe principle of addition is that heat insulation effect will get well, molten speed guarantee melt cinder supply can be effectively controlled.Heat insulation effect is good not
It can only avoid covering slag from crusting in crystallizer, avoid tacky, due also to temperature is higher, molten steel meniscus temperature will not be too low,
Meniscus will not premature solidification, be conducive to the precipitation of gas in molten steel, to avoid the generation of rimhole.C of the present inventionGuWeight
Percentage composition is to make covering slag while with preferable insulation effect, having has covering slag in crystallizer 1%~2%
Clearly slag layer, sinter layer, liquid slag layer structure avoid Ultra-low Carbon Molten Steel carburetting to guarantee the supply of melt cinder.
5. the fusion temperature of covering slag, which absorbs field trash ability and lubricating action to slag, larger impact, covering slag
When fusing point is within the scope of 1100 ~ 1150 DEG C, thermal stability and chemical stabilization of the covering slag in melting process can be significantly improved
Property, it is mingled with performance and its uniformly transfer heat performance to realize and have good absorption in ultra-low carbon steel slab continuous casting process.
6. the viscosity of covering slag is too low, slag consumption is excessive, and slab oscillation mark is deep, causes slag film to thicken and unevenly, slab holds
It is also easy to produce crackle；Viscosity is excessively high to make the reduction of slag consumption, cause slag film thinning or even part green shell cannot adequately lubricate,
It easily causes the shallow disorder of oscillation mark and distortion induces the subcutaneous micro-crack of slab and even results in bonding steel leakage accident.Viscosity number be 0.25 ~
0.45Pas meets slag consumption while require, reduces the generation for even avoiding ultra-low carbon steel slab quality problems.
7. each chemical component of the present invention is used cooperatively, while not only guaranteeing insulation effect, but also suitable fusing speed is kept
Degree, gained casting billet surface is smooth, oscillation mark is regular, shallower, and without slag, rimhole and other issues is added, carbon content does not increase in slab
Add.
Specific embodiment
Below with reference to some specific embodiments, the present invention is further described.
The chemical component of 1 ~ 3 continuous super low carbon steel casting crystallizer protecting residue of the embodiment of the present invention 1 ~ 8 and comparative example and
Its weight percentage is shown in Table 1.
The raw material and its weight percentage of 1 ~ 8 continuous super low carbon steel casting crystallizer protecting residue of the embodiment of the present invention are shown in Table 2.
The chemical component and its weight of the pre- melt of 1 ~ 8 continuous super low carbon steel casting crystallizer protecting residue of the embodiment of the present invention contain
Amount is shown in Table 3.
The adhesive of comparative example 1 ~ 4 is sodium carboxymethylcellulose and sodium lignin sulfonate, and the two weight ratio is 1:2.
The adhesive of comparative example 5 is sodium carboxymethylcellulose and sodium lignin sulfonate, and the two weight ratio is 1:1.
The adhesive of comparative example 6 is sodium carboxymethylcellulose and sodium lignin sulfonate, and the two weight ratio is 1:3.
The adhesive of comparative example 7 is sodium carboxymethylcellulose.
The adhesive of comparative example 8 is sodium lignin sulfonate.
The preparation method of above-mentioned continuous super low carbon steel casting crystallizer protecting residue the following steps are included:
(1) ingredient: prepare various raw materials by above-mentioned chemical component and its weight percentage；
(2) it melts: with various raw materials of the furnace melting in addition to carbonaceous material, adhesive；
(3) water quenching: the slag for melting out is directly entered pond cooled and solidified into vitreum；
(4) dry: vitreum is dried to water content≤2%；
(5) it crushes: vitreum is crushed to powder size >=200 mesh；
(6) it prepares: carbonaceous material and adhesive being added in step (5) powder；
(7) mist projection granulating: step (6) various raw materials are stirred evenly in blender, successively enter ball mill dry grinding, levigator
Levigate and pulping, mist projection granulating to get.
The performance indicator of 1 ~ 3 continuous super low carbon steel casting crystallizer protecting residue of the embodiment of the present invention 1 ~ 8 and comparative example is shown in
Table 4.
The weight percentage (wt%) of 1 embodiment 1 ~ 8 of table and the chemical component of 1 ~ 3 covering slag of comparative example
The various raw material weight percentages (wt%) of 2 embodiment of table, 1 ~ 8 covering slag
The weight percentage (wt%) of the chemical component of the pre- melt of 3 embodiment of table 1 ~ 8
1 ~ 3 covering slag performance parameter of 4 embodiment of the present invention 1 ~ 8 of table and comparative example
As shown in Table 4, comparative example, the C of comparative example 1 are compared toGuContent increases, and CaO content reduces, fusing
Speed is slow, and viscosity improves；The C of comparative example 2GuContent is reduced, Na2O increases, and fusing point reduces, and burn-off rate improves；Comparison is real
Apply the Na of example 32O is reduced, and CaO content improves, and viscosity reduces, and fusing point improves；1 ~ 8 continuous super low carbon steel casting knot of the embodiment of the present invention
Brilliant device covering slag dual alkalinity is 0.74~0.95, and viscosity is 0.25 ~ 0.45Pa at 1100 DEG C ~ 1150 DEG C of fusing point, 1300 DEG C
s.Dual alkalinity is suitable, and absorption is mingled with, and has good lubricant effect, and improves covering slag crystallization rate and increase slag film heat
Resistance reaches slab slow cooling effect, reduces crackle and generates；The present invention protects slag melting point suitable, and burn-off rate appropriateness improves crystallizer
Interior hot-fluid effect, prevents carburetting；Covering slag viscosity of the present invention is suitable, meets slag consumption while require, reduces and even keep away
Exempt from the generation of ultra-low carbon steel slab quality problems；Burn-off rate of the present invention is suitable, and slag layer thickness is suitable, and casting billet surface is existing without slag inclusion
As.
The embodiment of the present invention 1 ~ 8 and 1 ~ 3 continuous super low carbon steel casting crystallizer protecting residue of comparative example are applied to Ultra-low carbon
Billet is smelted, and steel bonding bleed-out phenomenon occurs in comparative example 1, and molten steel recarburization, slag inclusion occurs in 2 slab of comparative example, right
The defects of more cracked than embodiment 3.In molten steel continuous casting process, covering slag can uniformly cover 1 ~ 8 covering slag of the embodiment of the present invention
It is placed in crystallizer, flare is active, normal, 15~18mm of liquid slag layer thickness, and steel slag consumption per ton is 0.5~0.6kg/ tons, melts
Change 30~40s of speed, is able to satisfy the needs of continuous casting.Slag item in continuous casting process is taken to be chemically examined, viscosity is by 0.25~0.45
0.6~0.8 is risen to, illustrates that there is covering slag good absorption to be mingled with ability, ensure that the degree of purity of molten steel.Gained slab table
Face is smooth, oscillation mark is regular, shallower, and without slag, rimhole and other issues is added, carbon content does not increase in slab, and slab quality is good
It is good.
Claims (5)
1. a kind of continuous super low carbon steel casting crystallizer protecting residue, which is characterized in that its chemical component and its weight percentage are as follows:
CaO 36.76%~42.31%, SiO240%~51%, MgO 1%~3%, Al2O34.0%~6.0%, Na2O 3%~5%,
F-2%~4% and CGu1%~2%；
The covering slag is made of the raw material of following weight percent: pre- melt 55%~60%, wollastonite 6%~10%, ice crystal
5%~10%, fluorite 13%~16%, bauxite 4%~6%, glass powder 1%~3%, magnesia 2%~4%, carbon black 2%~4% and adhesive
2%~4%；
The pre- melt includes that the raw material of following weight percent is made: SiO2 35.0~45.0%, CaO 40.0~45.0%,
Al2O3 3.0~6.0%, Na2O 2.0~5.0%, MgO 3.0~6.0% and F-5%~8%.
2. continuous super low carbon steel casting crystallizer protecting residue according to claim 1, which is characterized in that the two of the covering slag
First basicity is 0.74~0.95.
3. continuous super low carbon steel casting crystallizer protecting residue according to claim 1, which is characterized in that the covering slag melts
Viscosity is 0.25 ~ 0.45Pas, 30~40s of burn-off rate at 1100 DEG C ~ 1150 DEG C, 1300 DEG C of point.
4. continuous super low carbon steel casting crystallizer protecting residue according to claim 1, which is characterized in that described adhesive is carboxylic
Sodium carboxymethylcellulose pyce and/or sodium lignin sulfonate.
5. continuous super low carbon steel casting crystallizer protecting residue according to claim 4, which is characterized in that described adhesive is carboxylic
Sodium carboxymethylcellulose pyce and sodium lignin sulfonate, the two weight ratio are 1:1~3.
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| CN201611253209.4A CN107282903B (en) | 2016-12-30 | 2016-12-30 | A kind of continuous super low carbon steel casting crystallizer protecting residue |
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| CN109967706B (en) * | 2019-05-05 | 2021-02-26 | 西峡县西保冶金材料有限公司 | Function protection material of continuous casting crystallizer for ultra-low carbon IF steel |
| CN113695542A (en) * | 2021-07-13 | 2021-11-26 | 李富海 | Preparation method for producing square billet continuous casting covering slag by using electrolytic aluminum carbon slag |
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| JPS63174767A (en) * | 1987-01-14 | 1988-07-19 | Nippon Steel Corp | Powder for casting dead soft carbon steel |
| JPH04294849A (en) * | 1991-03-20 | 1992-10-19 | Shinagawa Refract Co Ltd | Mold powder for continuous casting |
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