CN101468386B - Continuous casting mould powder and preparation method thereof - Google Patents
Continuous casting mould powder and preparation method thereof Download PDFInfo
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- CN101468386B CN101468386B CN2007103070468A CN200710307046A CN101468386B CN 101468386 B CN101468386 B CN 101468386B CN 2007103070468 A CN2007103070468 A CN 2007103070468A CN 200710307046 A CN200710307046 A CN 200710307046A CN 101468386 B CN101468386 B CN 101468386B
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Abstract
The invention provides continuous casting protective slag, which contains a compound containing calcium and a compound containing aluminum, and an additive; the additive is selected from one or more compounds for reducing the melting point and viscosity of the protective slag in the melting state, and the dosage of the additive ensures that the melting point of the protective slag is reduced to between 1,000 and 1,300 DEG C and viscosity below 1,300 DEG C is reduced to between 0.1 and 1Pa.S; the weight ratio of the compound containing aluminum to the compound containing calcium in the protective slag by oxides is 0.3-1.5; and by taking total weight of the protective slag as a standard based on the oxides, the content of the compound containing aluminum is more than or equal to 5 percent of the total weight. Compared with the prior continuous casting protective slag, the continuous casting protective slag can effectively reduce the surface defect rate of casting blanks.
Description
Technical field
The invention relates to a kind of continuous casting covering slag and preparation method thereof.
Background technology
At present, more for the research of the continuous casting covering slag of casting Aldecor, austenitic stainless steel, peritectic steel steel and high-carbon steel, for example:
Wang Qian has reported heavy steel by control covering slag crystal property in " iron and steel " magazine the 38th volume the 4th phase 23-26 page or leaf, 16Mn series Aldecor casting billet surface micro-crack is reduced to below 1.0% by 22%.Described continuous casting covering slag consists of: CaO is 41.18 weight %, SiO
2Be 36.48 weight %, Al
2O
3Be 1.50 weight %, Fe
2O
3Be 0.54 weight %, MgO is 5.62 weight %, F
-Be 4.50 weight %, Na
2O+K
2O is 8.80 weight %, Al
2O
3/ CaO is 0.04; Perhaps CaO is 42.47 weight %, SiO
2Be 38.24 weight %, Al
2O
3Be 1.50 weight %, Fe
2O
3Be 0.54 weight %, MgO is 5.62 weight %, F
-Be 5.40 weight %, Na
2O+K
2O is 9.90 weight %, and C is 8.43 weight %, Al
2O
3/ CaO is 0.035; Perhaps CaO is 30.04 weight %, SiO
2Be 31.82 weight %, Al
2O
3Be 0.21 weight %, MgO is 4.35 weight %, F
-Be 2.25 weight %, Na
2O+K
2O is 4.40 weight %, and C is 8.43 weight %, Al
2O
3/ CaO is 0.007; Perhaps CaO is 30.97 weight %, SiO
2Be 34.04 weight %, Al
2O
3Be 0.18 weight %, MgO is 3.48 weight %, F
-Be 4.05 weight %, Na
2O+K
2O is 6.05 weight %, and C is 8.43 weight %, Al
2O
3/ CaO is 0.006.
Publication number be CN 1657200A patent disclosure a kind of protective slag for Austenic stainless steel plate wand crystallizer; its chemical composition (weight %) is calcium oxide 34.5-37.5; silica 26.5-28.5; alundum (Al 7.50-8.50; magnesia is less than 1.00; di-iron trioxide is less than 1.00; manganese oxide 3.00-3.50; fluorine ion 6.00-7.00, sodium oxide molybdena 7.00-8.00, lithia 0.50-0.80; fixed carbon 1.7-2.00; the weight ratio of covering slag basicity calcium oxide and silica is 1.30-1.40, and wherein, the weight ratio of aluminium oxide and calcium oxide is 0.2-0.25.
Publication number be CN 1911560A patent disclosure a kind of cut deal continuous casting covering slag of low-alloy high-strength; its component (weight %) is: carbon black 0.5-2.0, graphite 4-10, sodium oxide molybdena 4-12; fluorine ion 1-7; alundum (Al 2-7, di-iron trioxide 1-3, crystal controlling agent 7-20; lithia 0-2; all the other are calcium oxide and silica, and wherein, the weight ratio of calcium oxide and silica is 0.90-1.05.
Yet above-mentioned covering slag is used to cast during high aluminum steel, can not effectively reduce defectives such as longitudinal crack, transverse crack, depression, pit, pipe, the oscillation mark of casting billet surface be dark, promptly the casting billet surface ratio of defects is higher.
Summary of the invention
The objective of the invention is the higher defective of casting billet surface ratio of defects in order to overcome prior continuous casting protective slag and to be used to cast high aluminum steel, provide a kind of the casting can effectively reduce the continuous casting covering slag of casting billet surface ratio of defects during high aluminum steel.
The invention provides a kind of continuous casting covering slag, described covering slag contains calcium containing compound and aluminum contained compound, wherein, this covering slag also contains additive, in the compound that be selected from described the additive fusing point that makes described covering slag and the viscosity under the molten condition reduce one or more, the consumption of described additive makes the fusing point of described covering slag be reduced to 1000-1300 ℃, and the viscosity under 1300 ℃ is reduced to 0.10-1.0PaS; And in oxide, in the described covering slag, the weight ratio of aluminum contained compound and calcium containing compound is 0.3-1.5; Total amount with described covering slag is a benchmark, and in oxide, the content of described aluminum contained compound is more than or equal to 5 weight %.
The invention provides a kind of preparation method of continuous casting covering slag, this method comprises calcium containing compound and aluminum contained compound is mixed, wherein, this method also comprises the adding additive, in the compound that be selected from described the additive fusing point that makes described covering slag and the viscosity under the molten condition reduce one or more, the consumption of described additive makes the fusing point of described covering slag be reduced to 1000-1300 ℃, and the viscosity under 1300 ℃ is reduced to 0.10-1.0PaS; And in oxide, in the described covering slag, the weight ratio of aluminum contained compound and calcium containing compound is 0.3-1.5; Total amount with described covering slag is a benchmark, and in oxide, the content of described aluminum contained compound is more than or equal to 5 weight %.
The surface defect rate of the strand of the continuous casting covering slag A1-A13 casting that provides with embodiment of the invention 1-13 is 2.0-4.0%, and the surface defect rate of the strand of casting with the continuous casting covering slag AC1 of Comparative Examples 1 is 35%; Therefore, compare with prior continuous casting protective slag, with comparing of prior continuous casting protective slag, continuous casting covering slag provided by the invention can effectively reduce the surface defect rate of strand.
And, the present invention preferably use semi-reinforcing carbon black, wear-resisting carbon black, in super carbon black, graphite, coke and the carburant two or more as carbon materials, further preferred described carbon source in semi-reinforcing carbon black, wear-resisting carbon black, in the super carbon black at least two kinds with graphite, coke and carburant at least a mixture, total amount with carbon is a benchmark, in carbon atom, described semi-reinforcing carbon black, wear-resisting carbon black, in the total amount of super carbon black be 20-50 weight %, the total amount of described graphite, coke and carburant is 50-80 weight %.The liquid slag layer thickness of the continuous casting covering slag of such composition not only can be controlled in the 10-15 millimeter, and thickness is stable, does not reduce with the raising of casting machine pulling rate substantially, and this helps the control of slab quality, promptly can further reduce the surface defect rate of strand; The more important thing is that when adopting carbon provided by the invention as carbon materials, the crystallizer state is good, promptly in the process of 100 tons of high aluminum steels of every casting, do not have slag bar and slag group in the crystallizer, therefore can improve the processing safety when watering cast steel.And adopt single carbon such as carbon black or graphite in the existing covering slag as carbon materials, though the thickness of the liquid slag layer that such continuous casting covering slag forms in crystallizer also can be controlled in the 10-15 millimeter, but its thickness instability, raising with the casting machine pulling rate, its thickness attenuation, even be low to moderate 8 millimeters, and be unfavorable for the control of slab quality, promptly the casting billet surface ratio of defects is higher; The more important thing is; when adopting single carbon as carbon materials; the crystallizer state is very poor; in the process of 100 tons of high aluminum steels of every casting; the slag bar is a lot of in the covering slag, and covering slag reunites and seriously to cause slag group a lot, as untimely remove slag bar and the slag group of removing; will stop up the passage between slag inflow crystallizer wall and casting blank shell, the danger of bleed-out is arranged.
Continuous casting covering slag provided by the invention be applicable to when casting casting billet surface easily produce in the defectives such as longitudinal crack, transverse crack, depression, pit, pipe and oscillation mark one or more contain aluminum steel, casting billet surface can produce the high aluminum steel of continuous casting square billet of defectives such as transverse crack, depression, pit, oscillation mark simultaneously when being specially adapted to cast.
The specific embodiment
The invention provides a kind of continuous casting covering slag, described covering slag contains calcium containing compound and aluminum contained compound, wherein, this covering slag also contains additive, in the compound that be selected from described the additive fusing point that makes described covering slag and the viscosity under the molten condition reduce one or more, the consumption of described additive makes the fusing point of described covering slag be reduced to 1000-1300 ℃, and the viscosity under 1300 ℃ is reduced to 0.10-1.0PaS; And in oxide, in the described covering slag, the weight ratio of aluminum contained compound and calcium containing compound is 0.3-1.5; Total amount with described covering slag is a benchmark, and in oxide, the content of described aluminum contained compound is more than or equal to 5 weight %.
The consumption of preferred described additive makes the fusing point of described covering slag be reduced to 1020-1260 ℃, and the viscosity under 1300 ℃ is reduced to 0.15-0.8PaS; And in oxide, in the described covering slag, the weight ratio of aluminum contained compound and calcium containing compound is 0.5-1; Total amount with described covering slag is a benchmark, and the content of described aluminum contained compound is 10-45 weight %.
According to the present invention, if guarantee under the fusing point, 1300 ℃ of continuous casting covering slag viscosity and in oxide, the weight ratio of aluminium oxide and calcium oxide can realize purpose of the present invention in above-mentioned scope.Those skilled in the art can select the composition of used continuous casting covering slag as the required additive and the percentage by weight of each composition according to above-mentioned parameter; for example; described additive can contain compounds containing sodium; magnesium-containing compound; containing barium compound and carbon; total amount with described covering slag is a benchmark; in oxide; the content of described calcium containing compound is 15-45 weight %; the content of described compounds containing sodium is 2-10 weight %; the content of described magnesium-containing compound is 1-10 weight %; the content of described containing barium compound is 6-16 weight %; in carbon atom, the content of described carbon is 4-14 weight %.
Other outer composition of de-carbon all can be for well known to a person skilled in the art various materials in the above-mentioned covering slag, and for example, described compounds containing sodium can derive from Na
2CO
3And/or NaF; Described magnesium-containing compound can derive from magnesia; Described containing barium compound can derive from BaCO
3
Described carbon can be for well known to a person skilled in the art carbon materials, for example can derive from semi-reinforcing carbon black, wear-resisting carbon black, in super carbon black, graphite, coke and the carburant one or more; Preferred described carbon source in semi-reinforcing carbon black, wear-resisting carbon black, in super carbon black, graphite, coke and the carburant two or more.The present invention further preferred described carbon source in semi-reinforcing carbon black, wear-resisting carbon black, in the super carbon black at least two kinds with graphite, coke and carburant at least a mixture, total amount with carbon is a benchmark, in carbon atom, described semi-reinforcing carbon black, wear-resisting carbon black, in the total amount of super carbon black be 20-50 weight %, the total amount of described graphite, coke and carburant is 50-80 weight %.The liquid slag layer thickness of the continuous casting covering slag of such composition is at the 10-15 millimeter, and thickness is stable, do not reduce with the raising of casting machine pulling rate substantially, and this helps the control of slab quality, promptly can further reduce the casting billet surface ratio of defects; The more important thing is that when adopting the preferred carbon of the present invention as carbon materials, the crystallizer state is good, promptly the slag bar is less or do not have the slag bar in the covering slag, and slag group also seldom, therefore can improve the processing safety when watering cast steel.
The further preferred described carbon source of the present invention in semi-reinforcing carbon black and at least a mixture in super carbon black and graphite, coke and the carburant.According to this optimal way, can further reduce the casting billet surface ratio of defects.
Described additive can also contain silicon-containing compound and/or fluorochemical, is benchmark with the total amount of described covering slag, and the content of described silicon-containing compound is 0.5-20 weight %, and in fluorine atom, the content of described fluorochemical is 0.5-10 weight %.
Described silicon-containing compound can derive from that wollastonite, cement be who knows, in quartz sand and the feldspar one or more; Described fluorochemical can derive from one or more among fluorite, ice crystal and the NaF;
Under the preferable case, described additive also contains manganese compound and/or boron-containing compound, is benchmark with the total amount of described covering slag, and the described content that contains manganese compound is 0.5-10 weight %, and the content of described boron-containing compound is 0.5-13 weight %.
The described manganese compound that contains can derive from MnCO
3And/or manganese ore; Described boron-containing compound can derive from borax.
Among the present invention, described calcium containing compound can derive from who knows one or more of wollastonite, lime stone and cement; Described aluminum contained compound can derive from bauxite, cement be who knows with white clay in one or more.
According to continuous casting covering slag provided by the invention, described continuous casting covering slag is full particle and/or hollow spheres particle continuous casting covering slag, is preferably hollow spheres particle continuous casting covering slag.According to this optimal way, can further reduce the casting billet surface ratio of defects.
Further the particle diameter scope of preferred described hollow spheres particle is the 0.1-1.0 millimeter, and the hollow spheres particle grain size more than the 80 weight % is in 0.1-0.8 millimeter scope.
The invention provides a kind of preparation method of continuous casting covering slag, this method comprises calcium containing compound and aluminum contained compound is mixed, wherein, this method also comprises the adding additive, in the compound that be selected from described the additive fusing point that makes described covering slag and the viscosity under the molten condition reduce one or more, the consumption of described additive makes the fusing point of described covering slag be reduced to 1000-1300 ℃, and the viscosity under 1300 ℃ is reduced to 0.10-1.0PaS; And in oxide, in the described covering slag, the weight ratio of aluminum contained compound and calcium containing compound is 0.3-1.5; Total amount with described covering slag is a benchmark, and in oxide, the content of described aluminum contained compound is more than or equal to 5 weight %.
According to the preparation method of continuous casting covering slag provided by the invention, can be directly the various compositions that form described continuous casting covering slag be mixed the back granulation according to the ratio of described continuous casting covering slag and make continuous casting covering slag; Also can obtain pre-melt, again should pre-melt mix back granulation with remaining composition and carbon and make continuous casting covering slag by part or all of mixings back fritting with one or more compositions outside the de-carbon in these compositions.The industrial general fusing point of buying earlier, 1300 ℃ of viscosity and in oxide, the weight ratio of aluminum contained compound and calcium containing compound is one of them and required covering slag fusing point at least, 1300 ℃ of viscosity and in oxide, at least one of them approaching pre-melt in the weight ratio of aluminum contained compound and calcium containing compound, the viscosity that is reduced under 1000-1300 ℃ and 1300 ℃ according to the fusing point that makes required covering slag is reduced to 0.10-1.0PaS then, and in oxide, the weight ratio of aluminum contained compound and calcium containing compound is the principle of 0.3-1.5 in the described covering slag, the kind and the consumption of definite additive that should add, and will determine that the additive behind kind and the consumption mixes with pre-melt, promptly obtains required covering slag; Preferred pre-melt accounts for more than the 40 weight % of covering slag total amount, and the particle diameter of described pre-melt is preferably the 5-60 micron below 80 microns.The present invention more preferably all mixes other composition outside the de-carbon in the described covering slag back fritting, again product and the carbon that obtains after the fritting is mixed the back granulation.The continuous casting covering slag that obtains by this method is also referred to as the preliminary melting type continuous casting covering slag.Because under the same composition condition, the preliminary melting type continuous casting covering slag can further improve the uniformity of covering slag fusion process, and then helps reducing the casting billet surface ratio of defects.Therefore the preferred described continuous casting covering slag of the present invention is the preliminary melting type continuous casting covering slag.
Above-mentioned fritting and process for granulating all can be for well known to a person skilled in the art the whole bag of tricks.For example; described pre-melt can adopt electric furnace or furnace cupola to prepare; commonly used is electric furnace; concrete grammar comprises in pack into after the raw material that will be prepared into covering slag mixes electric furnace or the furnace cupola and melting, then with melting charge through water-cooled, fragmentation; fine grinding; promptly obtain pre-melt, the technology difference during fritting has been conventionally known to one of skill in the art, just no longer repeats at this.Described granulation can be the disk granulation; extruder grain or mist projection granulating; what obtain by disk granulation and extruder grain is solid shape particle; what obtain by mist projection granulating is the hollow spheres granulation; wherein; the preferred mist projection granulating that uses; the method of mist projection granulating has been conventionally known to one of skill in the art; comprise that the covering slag raw material is added water makes slurry; by compression pump slurry is delivered to and to be carried out granulating and drying in the spray granulating and drying tower; promptly obtain the covering slag that the particle diameter scope is the 0.1-1.0 millimeter through screening again, and the hollow spheres particle grain size more than the 80 weight % is in 0.1-0.8 millimeter scope.Parameter during mist projection granulating is as follows: slurry concentration is that 20-80 weight %, pressure are that 1-3 MPa, EAT are that 600-900 ℃, exhaust gas temperature are that 100-300 ℃, spray sheet diameter are the 1.5-2.5 millimeter.
Below will the invention will be further described by embodiment.
Embodiment 1
Present embodiment is used to illustrate continuous casting covering slag provided by the invention and preparation method thereof.
With 43 kilograms lime, 45.5 kilograms bauxite, 3.5 kilograms Na
2CO
3, 2 kilograms magnesia and 7 kilograms BaCO
3(these raw materials are equivalent to 43 kilograms of CaO, 43 kilograms Al
2O
3, 2 kilograms Na
2O, 2 kilograms MgO, 6 kilograms BaO) mix after, with electric furnace its fusion is prepared into the pre-melt that particle diameter is the 5-60 micron.Then will this pre-melt and 1 kilogram semi-reinforcing carbon black; the graphite of super carbon black and 2 kilograms mixes in 1 kilogram; mix with mixer then; mix 400 kg water again and mixture is made the slurry that concentration is 20 weight % through ball mill; be 2 MPas at pressure at last; EAT is 800 ℃; exhaust gas temperature is 200 ℃; spray sheet diameter is under 2 millimeters the condition; by compression pump slurry is delivered to and to be carried out granulating and drying in the spray granulating and drying tower; promptly obtaining particle size range through screening again is the 0.1-1.0 millimeter; and the hollow spheres particle of the particle diameter of 80 weight % in 0.1-0.8 millimeter scope; be continuous casting covering slag A1 provided by the invention; in oxide, the weight ratio of aluminum contained compound and calcium containing compound is 1 in this covering slag.
The fusing point that records this continuous casting covering slag with hemisphere point method is 1260 ℃, is 0.64PaS with the hang spring method 1300 ℃ of viscosity that record this continuous casting covering slag.
Comparative Examples 1
This Comparative Examples is used to illustrate prior continuous casting protective slag and preparation method thereof.
Prepare this continuous casting covering slag according to the method identical with embodiment 1, different is, with 38 kilograms of wollastonites, 10 kilograms of feldspars, 12 kilograms of fluorites, 14 kilograms of magnesia, 2 kg aluminium alumina and 22 kilograms of Na
2CO
3(these raw materials are equivalent to 25 kilograms of CaO, 26.6 kilograms of SiO
2, 2.5 kilograms Al
2O
3, 12.5 kilograms Na
2O, 14 kilograms MgO, 6 kilograms F
-) and 2 kilograms of graphite replace raw material among the embodiment 1, wherein, in oxide, the weight ratio of aluminum contained compound and calcium containing compound is 0.10 in this covering slag.
The fusing point that hemisphere point method records this continuous casting covering slag is 1115 ℃, is 0.19PaS with the hang spring method 1300 ℃ of viscosity that record this continuous casting covering slag.
Embodiment 2
Present embodiment is used to illustrate continuous casting covering slag provided by the invention and preparation method thereof.
With 19 kilograms lime, 11 kilograms bauxite, 17 kilograms Na
2CO
3, 10 kilograms magnesia, 19 kilograms BaCO
3(these raw materials are equivalent to 20 kilograms of CaO, 10 kilograms Al with 18.5 kilograms quartz sand
2O
3, 10 kilograms Na
2O, MgO, 16 kilograms BaO, 20 kilograms of SiO of 10 kilograms
2) after the mixing, its fusion is prepared into the pre-melt that particle diameter is the 5-60 micron with electric furnace.Then will this pre-melt and 1.4 kilograms semi-reinforcing carbon black; 1.4 the graphite of super carbon black and 11.2 kilograms mixing in the kilogram; mix with mixer then; mix 400 kg water again and mixture is made the slurry that concentration is 20 weight % through ball mill; be 2 MPas at pressure at last; EAT is 800 ℃; exhaust gas temperature is 200 ℃; spray sheet diameter is under 2 millimeters the condition; by compression pump slurry is delivered to and to be carried out granulating and drying in the spray granulating and drying tower; promptly obtaining particle size range through screening again is the 0.1-1.0 millimeter; and the hollow spheres particle of the particle diameter of 80 weight % in 0.1-0.8 millimeter scope; be continuous casting covering slag A2 provided by the invention; in oxide, the weight ratio of aluminum contained compound and calcium containing compound is 0.5 in this covering slag.
The fusing point that records this continuous casting covering slag with hemisphere point method is 1210 ℃, is 0.40PaS with the hang spring method 1300 ℃ of viscosity that record this continuous casting covering slag.
Embodiment 3
Present embodiment is used to illustrate continuous casting covering slag provided by the invention and preparation method thereof.
With 15 kilograms of lime, 26 kilograms bauxite, 8.5 kilograms Na
2CO
3, 5 kilograms magnesia, 12 kilograms BaCO
3, 3.5 kilograms quartz sand and 20 kilograms fluorite (these raw materials are equivalent to 30 kilograms of CaO, 24 kilograms Al
2O
3, 5 kilograms Na
2O, MgO, 10 kilograms BaO, 6 kilograms of SiO of 5 kilograms
2, 10 kilograms F
-) after the mixing; with electric furnace the pre-melt that particle diameter is the 5-60 micron is made in its fusion; then will this pre-melt and 2 kilograms semi-reinforcing carbon black; the coke of super carbon black and 6 kilograms mixes in 2 kilograms; mix with mixer then; mix 25 kg water again and mixture is made the slurry that concentration is 80 weight % through ball mill; be 2 MPas at pressure at last; EAT is 8 ℃; exhaust gas temperature is 2 ℃; spray sheet diameter is under 2 millimeters the condition; by compression pump slurry is delivered to and to be carried out granulating and drying in the spray granulating and drying tower; promptly obtaining particle size range through screening again is the 0.1-1.0 millimeter; and; the hollow spheres particle of the particle diameter of 85 weight % in 0.1-0.8 millimeter scope; be continuous casting covering slag A3 provided by the invention; in oxide, in this covering slag, the weight ratio of aluminum contained compound and calcium containing compound is 0.8.
The fusing point that records this continuous casting covering slag with the hemisphere method is 1050 ℃, is 0.15PaS with the hang spring method 1300 ℃ of viscosity that record this continuous casting covering slag.
Embodiment 4
Present embodiment is used to illustrate continuous casting covering slag provided by the invention and preparation method thereof.
Prepare continuous casting covering slag with the method identical with embodiment 3, different is, with the MnCO of 2 kilograms fluorites and 16 kilograms
3(be equivalent to 0.5 kilogram F
-, 9.5 kilograms MnO) replace 20 kilograms fluorite (to be equivalent to 10 kilograms F
-), make continuous casting covering slag A4 provided by the invention.
The fusing point that records this continuous casting covering slag with the hemisphere method is 1150 ℃, is 0.8PaS with the hang spring method 1300 ℃ of viscosity that record this continuous casting covering slag.
Embodiment 5
Present embodiment is used to illustrate continuous casting covering slag provided by the invention and preparation method thereof.
Prepare continuous casting covering slag with the method identical with embodiment 3, different is, with 0.8 kilogram MnCO
3(be equivalent to 0.5 kilogram MnO, 9 kilograms B with 27 kilograms borax
2O
3) replace 16 kilograms MnCO
3(being equivalent to 9.5 kilograms MnO), make continuous casting covering slag A5 provided by the invention.
The fusing point that records this continuous casting covering slag with hemisphere point method is 1020 ℃, is 0.3PaS with the hang spring method 1300 ℃ of viscosity that record this continuous casting covering slag.
Embodiment 6
Present embodiment is used to illustrate continuous casting covering slag provided by the invention and preparation method thereof.
Prepare continuous casting covering slag with the method identical with embodiment 5, different is, with 10 kilograms graphite replace 2 kilograms semi-reinforcing carbon black, 2 kilograms in the graphite of super carbon black and 6 kilograms, obtain continuous casting covering slag A6 provided by the invention.
The fusing point that records this continuous casting covering slag with hemisphere point method is 1040 ℃, is 0.35PaS with the hang spring method 1300 ℃ of viscosity that record this continuous casting covering slag.
Embodiment 7
Present embodiment is used to illustrate continuous casting covering slag provided by the invention and preparation method thereof.
Prepare continuous casting covering slag with the method identical with embodiment 5, different is, with the graphite of 2 kilograms semi-reinforcing carbon blacks and 8 kilograms replace 2 kilograms semi-reinforcing carbon black, 2 kilograms in the graphite of super carbon black and 6 kilograms, obtain continuous casting covering slag A7 provided by the invention.
The fusing point that records this continuous casting covering slag with hemisphere point method is 1020 ℃, is 0.3PaS with the hang spring method 1300 ℃ of viscosity that record this continuous casting covering slag.
Embodiment 8
Present embodiment is used to illustrate continuous casting covering slag provided by the invention and preparation method thereof.
Prepare continuous casting covering slag with the method identical with embodiment 5; different is; with the graphite of 2 kilograms semi-reinforcing carbon blacks, 2 kilograms wear-resisting carbon black and 6 kilograms replace 2 kilograms semi-reinforcing carbon black, 2 kilograms in the graphite of super carbon black and 6 kilograms, obtain continuous casting covering slag A8 provided by the invention.
The fusing point that records this continuous casting covering slag with hemisphere point method is 1020 ℃, is 0.3PaS with the hang spring method 1300 ℃ of viscosity that record this continuous casting covering slag.
Embodiment 9
Present embodiment is used to illustrate continuous casting covering slag provided by the invention and preparation method thereof.
Prepare continuous casting covering slag with the method identical with embodiment 5, different is, with lime stone, bauxite, Na
2CO
3, magnesia, BaCO
3, quartz sand, fluorite, MnCO
3, borax, semi-reinforcing carbon black, in after super carbon black and graphite directly mixes; make slurry with ball mill; with mist projection granulating this slurry being made particle size range again is the 0.1-1.0 millimeter; and; the hollow spheres particle of the particle diameter of 80 weight % in 0.1-0.8 millimeter scope, continuous casting covering slag A9 promptly provided by the invention.
The fusing point that hemisphere point method records this continuous casting covering slag is 1020 ℃, is 0.3PaS with the hang spring method 1300 ℃ of viscosity that record this continuous casting covering slag.
Embodiment 10
Present embodiment is used to illustrate continuous casting covering slag provided by the invention and preparation method thereof.
Prepare continuous casting covering slag with the method identical with embodiment 1; different is; adopting the extruder grain method is that this mixture is made particle size range is the 0.1-1.0 millimeter for 1 millimeter screen cloth with the aperture; and; 80% the full particle of particle diameter in 0.1-0.8 millimeter scope, continuous casting covering slag A10 promptly provided by the invention.
The fusing point that hemisphere point method records this continuous casting covering slag is 1260 ℃, is 0.64PaS with the hang spring method 1300 ℃ of viscosity that record this continuous casting covering slag.
Embodiment 11
Present embodiment is used to illustrate continuous casting covering slag provided by the invention and preparation method thereof.
Prepare continuous casting covering slag with the method identical with embodiment 1; different is, with mist projection granulating this slurry being made particle size range is the 0.1-1.0 millimeter, and; the hollow spheres particle of the particle diameter of 70 weight % in 0.1-0.8 millimeter scope, continuous casting covering slag A11 promptly provided by the invention.
The fusing point that hemisphere point method records this continuous casting covering slag is 1260 ℃, is 0.64PaS with the hang spring method 1300 ℃ of viscosity that record this continuous casting covering slag.
Embodiment 12
Present embodiment is used to illustrate continuous casting covering slag provided by the invention and preparation method thereof.
Prepare continuous casting covering slag with embodiment 5 described methods, different is, with 55 kilograms of lime stones, 9 kilograms Na
2CO
3(be equivalent to 30 kilograms of CaO, 5 kilograms Na with 5 kilograms magnesia
2O, 5 kilograms MgO) mix after, with electric furnace its fusion is prepared into the pre-melt that particle diameter is the 5-60 micron.Then will this pre-melt and 26 kilograms bauxite, 12 kilograms BaCO
3, 3.5 kilograms quartz sand, 1 kilogram fluorite, 0.8 kilogram MnCO
3(these raw materials are equivalent to 24 kilograms Al with 27 kilograms borax
2O
3, BaO, 6 kilograms of SiO of 10 kilograms
2, 0.5 kilogram F
-, 0.5 kilogram MnO, 9 kilograms B
2O
3) and 2 kilograms semi-reinforcing carbon black, 2 kilograms in the carbon black of super carbon black and 6 kilograms mix (being that 40 weight % derive from pre-melt in the described mixture); obtaining particle size range according to the method granulation described in the embodiment 5 then is the 0.1-1.0 millimeter; and the hollow spheres particle of the particle diameter of 80 weight % in 0.1-0.8 millimeter scope; be continuous casting covering slag A12 provided by the invention; in oxide, the weight ratio of aluminum contained compound and calcium containing compound is 0.8 in this covering slag.
The fusing point that records this continuous casting covering slag with hemisphere point method is 1060 ℃, is 0.70PaS with the hang spring method 1300 ℃ of viscosity that record this continuous casting covering slag.
Embodiment 13
Present embodiment is used to illustrate continuous casting covering slag provided by the invention and preparation method thereof.
Prepare continuous casting covering slag with embodiment 5 described methods, different is, with 55 kilograms of lime stones, 26 kilograms bauxite, 9 kilograms Na
2CO
3, 5 kilograms magnesia and 12 kilograms BaCO
3(be equivalent to 30 kilograms of CaO, 24 kilograms Al
2O
3, 5 kilograms Na
2O, 5 kilograms MgO, 10 kilograms BaO) mix after, with electric furnace its fusion is prepared into the pre-melt that particle diameter is the 5-60 micron.Then will this pre-melt and 6.5 kilograms quartz sand, 1 kilogram fluorite, 0.8 kilogram MnCO
3(these raw materials are equivalent to 6 kilograms of SiO with 27 kilograms borax
2, 0.5 kilogram F
-, 0.5 kilogram MnO, 9 kilograms B
2O
3) and 2 kilograms semi-reinforcing carbon black, 2 kilograms in the carbon black of super carbon black and 6 kilograms mix (being that 74 weight % derive from pre-melt in the described mixture); obtaining particle size range according to the method granulation described in the embodiment 5 then is the 0.1-1.0 millimeter; and the hollow spheres particle of the particle diameter of 80 weight % in 0.1-0.8 millimeter scope; be continuous casting covering slag A13 provided by the invention; in oxide, the weight ratio of aluminum contained compound and calcium containing compound is 0.8 in this covering slag.
The fusing point that records this continuous casting covering slag with hemisphere point method is 1060 ℃, is 0.7PaS with the hang spring method 1300 ℃ of viscosity that record this continuous casting covering slag.
Embodiment 14-26
Present embodiment is used to illustrate the effect of continuous casting covering slag provided by the invention to strand.
Respectively in the continuous casting covering slag A1-A13 input side blank continuous casting crystallizer with embodiment 1-13 preparation; the thickness of the molten slag layer that continuous casting covering slag fusing back forms reaches the 10-15 millimeter; the casting machine pulling rate be 0.7-1.2 rice/minute; the high aluminum steel of the following composition of casting under the condition of square billet cross dimensions 360mm * 450mm: C:0.35-0.42 weight %; Si:0.20-0.45 weight %; Mn:0.30-0.60 weight %; P :≤0.035 weight %; S :≤0.035 weight %; Cr:1.35-1.65 weight %; Mo:0.15-0.25 weight %, Als:0.7-1.10 weight %.
In the process of this high aluminum steel of casting, find that the thickness of the molten slag layer of other covering slag maintains the 10-15 millimeter always except that continuous casting covering slag A6, and in the process of 100 tons of above-mentioned steel of casting, the workman does not pull the slag bar out from crystallizer, and does not have slag group; In the process of this high aluminum steel of casting, the thickness of the molten slag layer that continuous casting covering slag A6 forms is minimum to drop to 8 millimeters.In the process of 100 tons of above-mentioned steel of casting, the workman pulls a lot of slag bars out from crystallizer, and slag group is also a lot.
After casting finishes, stand inspection strand, defectives such as the longitudinal crack of record casting billet surface, transverse crack, depression, pit, pipe, oscillation mark are calculated the casting billet surface ratio of defects, and the result is as shown in table 1 below.Wherein, the casting billet surface longitudinal crackle is a longitudinal crack, and transversal crack is a transverse crack, and longitudinal groove is depression, and horizontal or oval groove is a pit, and the base shell is overlapping to be pipe, and barre is an oscillation mark.
Comparative Examples 2
This Comparative Examples is used for the effect of prior continuous casting protective slag to strand.
According to the high aluminum steel of the described method casting of embodiment 14-26 with embodiment 14-26 identical component, different is that continuous casting covering slag is the continuous casting covering slag AC1 of Comparative Examples 1 preparation.
In the process of this high aluminum steel of casting, find that the thickness of the molten slag layer that formed by continuous casting covering slag is minimum to drop to 8 millimeters.In the process of 100 tons of above-mentioned steel of casting, the workman pulls a lot of slag bars out from crystallizer, and slag group is also a lot.
After casting finishes, according to the described method of embodiment 14-26 stand inspection strand and write down the defectives such as longitudinal crack, transverse crack, depression, pit, pipe, oscillation mark of the record casting billet surface of casting billet surface, calculate the casting billet surface ratio of defects, the result is as shown in table 1 below.
Table 1
| Embodiment 14 | Embodiment 15 | Embodiment 16 | Embodiment 17 | Embodiment 18 | Embodiment 19 | Embodiment 20 | Embodiment 21 | Embodiment 22 | Embodiment 23 | Embodiment 24 | Embodiment 25 | Embodiment 26 | Comparative Examples 2 | |
| Continuous casting covering slag | A1 | A2 | A3 | A4 | A5 | A6 | A7 | A8 | A9 | A10 | A11 | A12 | A13 | AC1 |
| The casting billet surface ratio of defects | 2.4 | 2.4 | 2.3 | 2.1 | 2.0 | 3.0 | 2.8 | 2.6 | 4.0 | 4.0 | 3.5 | 3.7 | 3.5 | 35 |
From the data of table 1 as can be seen, the surface defect rate of the strand of the continuous casting covering slag A1-A13 casting that provides with embodiment of the invention 1-13 is 2.0-4.0%, and the surface defect rate of the strand of casting with the continuous casting covering slag AC1 of Comparative Examples 1 is 35%; Therefore, compare with prior continuous casting protective slag, continuous casting covering slag provided by the invention can effectively reduce the surface defect rate of strand.
Claims (18)
1. continuous casting covering slag, described covering slag contains calcium containing compound and aluminum contained compound, it is characterized in that, this covering slag also contains additive, in the compound that be selected from described the additive fusing point that makes described covering slag and the viscosity under the molten condition reduce one or more, the consumption of described additive makes the fusing point of described covering slag be reduced to 1000-1300 ℃, and the viscosity under 1300 ℃ is reduced to 0.1-1PaS; And in oxide, in the described covering slag, the weight ratio of aluminum contained compound and calcium containing compound is 0.3-1.5; Total amount with described covering slag is a benchmark; in oxide; the content of described aluminum contained compound is more than or equal to weight 5%; described additive contains compounds containing sodium; magnesium-containing compound; containing barium compound and carbon; total amount with described covering slag is a benchmark; in oxide; the content of described calcium containing compound is 15-45 weight %; the content of described compounds containing sodium is 2-10 weight %; the content of described magnesium-containing compound is 1-10 weight %; the content of described containing barium compound is 6-16 weight %; in carbon atom; the content of described carbon is 4-14 weight %; described carbon source is in semi-reinforcing carbon black; wear-resisting carbon black; in at least two kinds and graphite in the super carbon black; at least a mixture in coke and the carburant is a benchmark with the total amount of carbon, in carbon atom; described semi-reinforcing carbon black; wear-resisting carbon black; in the total amount of super carbon black be 20-50 weight %, described graphite; the total amount of coke and carburant is 50-80 weight %.
2. covering slag according to claim 1, wherein, the consumption of described additive makes the fusing point of described covering slag be reduced to 1020-1260 ℃, and the viscosity under 1300 ℃ is reduced to 0.15-0.8PaS; And in oxide, in the described covering slag, the weight ratio of aluminum contained compound and calcium containing compound is 0.5-1; Total amount with described covering slag is a benchmark, and in oxide, the content of described aluminum contained compound is 10-45 weight %.
3. covering slag according to claim 1, wherein, described compounds containing sodium derives from Na
2CO
3And/or NaF; Described magnesium-containing compound derives from magnesia; Described containing barium compound derives from BaCO
3
4. covering slag according to claim 1; wherein, described additive also contains manganese compound and/or boron-containing compound, is benchmark with the total amount of described covering slag; the described content that contains manganese compound is 0.5-10 weight %, and the content of described boron-containing compound is 0.5-13 weight %.
5. covering slag according to claim 4, wherein, the described manganese compound that contains derives from MnCO
3And/or manganese ore; Described boron-containing compound derives from borax.
6. covering slag according to claim 1 and 2, wherein, described calcium containing compound derives from who knows one or more of wollastonite, lime stone and cement; Described aluminum contained compound derives from bauxite, cement be who knows with white clay in one or more.
7. covering slag according to claim 1, wherein, described covering slag is the hollow spheres particle.
8. covering slag according to claim 7, wherein, the particle diameter scope of described hollow spheres particle is the 0.1-1.0 millimeter, and the particle diameter of the described hollow spheres particle that 80 weight % are above is in 0.1-0.8 millimeter scope.
9. the preparation method of the described continuous casting covering slag of claim 1, this method comprises calcium containing compound and aluminum contained compound is mixed, it is characterized in that, this method also comprises the adding additive, in the compound that be selected from described the additive fusing point that makes described covering slag and the viscosity under the molten condition reduce one or more, the consumption of described additive makes the fusing point of described covering slag be reduced to 1000-1300 ℃, and the viscosity under 1300 ℃ is reduced to 0.1-1PaS; And in oxide, in the described covering slag, the weight ratio of aluminum contained compound and calcium containing compound is 0.3-1.5; Total amount with described covering slag is a benchmark; in oxide; the content of described aluminum contained compound is more than or equal to weight 5%; described additive contains compounds containing sodium; magnesium-containing compound; containing barium compound and carbon; total amount with described covering slag is a benchmark; in oxide; the content of described calcium containing compound is 15-45 weight %; the content of described compounds containing sodium is 2-10 weight %; the content of described magnesium-containing compound is 1-10 weight %; the content of described containing barium compound is 6-16 weight %; in carbon atom; the content of described carbon is 4-14 weight %; described carbon source is in semi-reinforcing carbon black; wear-resisting carbon black; in at least two kinds and graphite in the super carbon black; at least a mixture in coke and the carburant is a benchmark with the total amount of carbon, in carbon atom; described semi-reinforcing carbon black; wear-resisting carbon black; in the total amount of super carbon black be 20-50 weight %, described graphite; the total amount of coke and carburant is 50-80 weight %.
10. method according to claim 9, wherein, the consumption of described additive makes the fusing point of described covering slag be reduced to 1020-1260 ℃, and the viscosity under 1300 ℃ is reduced to 0.15-0.8PaS; And in oxide, in the described covering slag, the weight ratio of aluminum contained compound and calcium containing compound is 0.5-1; Total amount with described covering slag is a benchmark, and in oxide, the content of described aluminum contained compound is 10-45 weight %.
11. method according to claim 9, wherein, described compounds containing sodium derives from Na
2CO
3And/or NaF; Described magnesium-containing compound derives from magnesia; Described containing barium compound derives from BaCO
3
12. method according to claim 9; wherein, described additive also contains manganese compound and/or boron-containing compound, is benchmark with the total amount of described covering slag; the described content that contains manganese compound is 0.5-10 weight %, and the content of described boron-containing compound is 0.5-13 weight %.
13. method according to claim 12, wherein, the described manganese compound that contains derives from MnCO
3And/or manganese ore; Described boron-containing compound derives from borax.
14. according to claim 9 or 10 described covering slags, wherein, described calcium containing compound derives from who knows one or more of wollastonite, lime stone and cement; Described aluminum contained compound derives from bauxite, cement be who knows with white clay in one or more.
15. method according to claim 14, wherein, outside the de-carbon, described calcium containing compound and aluminum contained compound and additive partly or entirely derive from pre-melt, the particle diameter of described pre-melt is below 80 microns.
16. method according to claim 15 wherein, derives from pre-melt more than the 40 weight % in described calcium containing compound, silicon-containing compound and aluminum contained compound and the additive, the particle diameter of described pre-melt is the 5-60 micron.
17. method according to claim 9, wherein, this method comprises that also with calcium containing compound, silicon-containing compound and aluminum contained compound and additive granulation be the hollow spheres particle.
18. method according to claim 17, wherein, the particle diameter scope of described hollow spheres particle is the 0.1-1.0 millimeter, and the particle diameter of the described hollow spheres particle that 80 weight % are above is in 0.1-0.8 millimeter scope.
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| CN101992283A (en) * | 2009-08-10 | 2011-03-30 | 鞍钢股份有限公司 | Method for preventing peritectic steel continuous casting blank from generating cracks |
| CN103128243B (en) * | 2013-03-12 | 2015-06-10 | 西峡龙成冶金材料有限公司 | High aluminum steel special continuous casting crystallizer casting powder |
| CN104624997B (en) * | 2015-03-04 | 2016-08-24 | 西峡龙成冶金材料有限公司 | A kind of boron-containing steel continuous crystallizer protecting slag |
| CN107824754A (en) * | 2017-11-30 | 2018-03-23 | 攀钢集团西昌钢钒有限公司 | A kind of covering slag for chamfer crystallizer and the steel strand method using chamfer crystallizer |
| CN108176831A (en) * | 2017-12-28 | 2018-06-19 | 西峡龙成冶金材料有限公司 | A kind of high-aluminum steel continuous crystallizer protecting slag |
| CN109648055B (en) * | 2019-01-23 | 2021-03-30 | 山东钢铁股份有限公司 | Bearing steel continuous casting tail billet quality control method under unsteady state pouring condition |
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