CN103111592A - Tundish covering agent - Google Patents
Tundish covering agent Download PDFInfo
- Publication number
- CN103111592A CN103111592A CN2013100605692A CN201310060569A CN103111592A CN 103111592 A CN103111592 A CN 103111592A CN 2013100605692 A CN2013100605692 A CN 2013100605692A CN 201310060569 A CN201310060569 A CN 201310060569A CN 103111592 A CN103111592 A CN 103111592A
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- CN
- China
- Prior art keywords
- coverture
- lower floor
- molten steel
- tundish
- covering flux
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 114
- 239000010959 steel Substances 0.000 claims abstract description 114
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 37
- 239000012535 impurity Substances 0.000 claims abstract description 36
- 230000004907 flux Effects 0.000 claims description 52
- 239000011324 bead Substances 0.000 claims description 12
- 239000000758 substrate Substances 0.000 claims description 12
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 44
- 239000003795 chemical substances by application Substances 0.000 abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 6
- 239000002245 particle Substances 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 5
- 239000000377 silicon dioxide Substances 0.000 abstract description 3
- 229910052681 coesite Inorganic materials 0.000 abstract 2
- 229910052906 cristobalite Inorganic materials 0.000 abstract 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract 2
- 229910052682 stishovite Inorganic materials 0.000 abstract 2
- 229910052905 tridymite Inorganic materials 0.000 abstract 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 abstract 1
- 229910001634 calcium fluoride Inorganic materials 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910052755 nonmetal Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 description 28
- 238000005272 metallurgy Methods 0.000 description 23
- 238000004519 manufacturing process Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 8
- 229920001296 polysiloxane Polymers 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000004411 aluminium Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000010813 municipal solid waste Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides tundish covering agent. The tundish covering agent comprises lower covering agent, intermediate covering agent and upper covering agent. The lower covering agent is arranged above and contacts with molten steel and comprises, by weight, 40-50% of CaO, 25-35% of Al2O3, 1-8% of MgO, less than 5% of SiO2, 1-10% of CaF2, 1-5% of Na2O and the balance of unavoidable impurities. The intermediate covering agent is arranged on the lower covering agent and comprises magnesia based hollow particles. The upper covering agent is arranged on the intermediate covering agent and comprises, by weight, 88-94% of SiO2, 1-4% of C and the balance of unavoidable impurities. The intermediate covering agent can effectively adsorb non-metal impurities and fine fireproof material particles in molten steel so as to purify molten steel and can effectively insulate the molten steel.
Description
Technical field
The present invention relates to a kind of tundish covering flux, specifically, relate to a kind of tundish covering flux for high-aluminum steel.
Background technology
Traditional tundish is a transition container in casting process, only plays the effect of even molten steel composition and temperature and step-down, shunting molten steel, removal of inclusions.Along with the raising day by day that steel quality is required, people have proposed new view to the position of liquid steel refining in the production procedure of steel, namely tundish as a refinery reactor between ladle and crystallizer, with further raising slab quality.Wherein, in the process that adopts the tundish refined molten steel, tundish covering flux plays an important role.
Be the tundish refining of the high-aluminum steel of about 1.5%-2.5% for aluminium content, the aluminium in molten steel easily and coverture (SiO in coverture especially
2) or refractory material generation reduction reaction, make in molten steel the Si content overproof and generate a large amount of Al
2O
3Field trash causes nozzle blocking, molten steel to pollute, and the physicochemical properties of coverture are changed, and reduces the coverture metallurgical function.In addition, the aluminium in steel and coverture reaction can cause the aluminium content in molten steel reduce and product quality is descended.Therefore, for fear of the problems referred to above occurring, in tundish refining high-aluminum steel molten steel process, the coverture that uses should possess following function: (1) effectively adsorbs in molten steel non-metallic inclusion and tiny fire resisting material particle with purify hot metal; (2) isolated air is oxidized to prevent molten steel; (3) adiabatic heat-insulation is to reduce the liquid steel temperature loss; (4) has lower dioxide-containing silica to avoid causing molten steel to increase silicon.
Yet present normally used tundish covering flux can not satisfy above-mentioned functions simultaneously.For example, although alkaline tundish covering flux can adsorb the Al in molten steel effectively
2O
3Field trashes etc. easily cause the molten steel crust but its heat insulation effect is bad; Again for example, although acid tundish covering flux has better heat insulation effect, it is the field trash in purify hot metal effectively.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art and a kind of tundish covering flux of the tundish refining for the high-aluminum steel molten steel is provided.
According to an aspect of the present invention, tundish covering flux comprises: lower floor's coverture, and be positioned on molten steel and contact molten steel, lower floor's coverture comprises the CaO of 40%-50%, the Al of 25%-35% by weight percentage
2O
3, 1%-8% MgO, the SiO less than 5%
2, 1%-10% CaF
2, 1%-5% Na
2The inevitable impurity of O and surplus; The middle level coverture is positioned on lower floor's coverture, and the middle level coverture comprises the magnesia substrate hollow bead; The upper strata coverture is positioned on the coverture of middle level, and the upper strata coverture comprises the SiO of 88%-94% by weight percentage
2, the C of 1%-4% and the inevitable impurity of surplus.
According to embodiments of the invention, the middle level coverture is made of the magnesia substrate hollow bead.
According to embodiments of the invention, tundish covering flux can comprise lower floor's coverture of 40%-75%, the middle level coverture of 15%-25% and the upper strata coverture of 10%-35% by weight percentage.
According to embodiments of the invention, tundish covering flux can comprise lower floor's coverture of 50-60%, the middle level coverture of 16-22% and the upper strata coverture of 20-30% by weight percentage.
According to embodiments of the invention, lower floor's coverture can comprise the CaO of 44-48%, the Al of 27-32% by weight percentage
2O
3, 4-8% MgO, the SiO less than 5%
2, 4-10% CaF
2, 3-5% Na
2The inevitable impurity of O and surplus.
According to embodiments of the invention, the fusing point of lower floor's coverture can be 1280 ℃-1320 ℃, and viscosity can be 1.5dPa.s-5.5dPa.s.
According to embodiments of the invention, the granularity of lower floor's coverture can be 1mm-5mm.
According to embodiments of the invention, the magnesia substrate hollow bead can comprise the SiO of 2%-12% by weight percentage
2, 2%-10% MgO, the Al of 1%-10% of CaO, 65%-80%
2O
3, the C of 1%-4% and the inevitable impurity of surplus.
According to embodiments of the invention, the magnesia substrate hollow bead can comprise the SiO of 2-8% by weight percentage
2, 4-8% MgO, the Al of 2-8% of CaO, 74-80%
2O
3, the C of 1-3% and the inevitable impurity of surplus.
According to embodiments of the invention, the granularity of middle level coverture can be 0.5mm-1.0mm.
According to embodiments of the invention, the upper strata coverture can comprise the SiO of 91-94% by weight percentage
2, the C of 1.5-3% and the inevitable impurity of surplus.
According to tundish covering flux of the present invention, thereby lower floor's coverture can adsorb the non-metallic inclusion in molten steel, tiny fire resisting material particle purify hot metal effectively; Thereby the upper strata coverture can be incubated molten steel and prevent the molten steel crust; Can prevent effectively that by the middle level coverture silicon in the coverture of upper strata from entering in molten steel.In addition, tundish covering flux according to the present invention by arrange three layers of coverture can be effectively to liquid steel temperature holding and make molten steel and air isolated.
The specific embodiment
The below describes in detail according to tundish covering flux of the present invention with reference to exemplary embodiment.
Tundish covering flux according to the present invention comprises three layers of coverture.Specifically, tundish covering flux according to the present invention comprises lower floor's coverture of being positioned at above molten steel and contacting with molten steel, is positioned at the middle level coverture on lower floor's coverture and is positioned at upper strata coverture on the coverture of middle level.
Lower floor's coverture can comprise the CaO of 40%-50%, the Al of 25%-35% by weight percentage
2O
3, 1%-8% MgO, the SiO less than 5%
2, 1%-10% CaF
2, 1%-5% Na
2The inevitable impurity of O and surplus.Lower floor's coverture with said components can effectively absorb in molten steel such as Al
2O
3Deng non-metallic inclusion and tiny fire resisting material particle, thereby play the effect of purify hot metal.Lower floor's coverture with said components can have the fusing point of 1280 ℃-1320 ℃ and the viscosity of 1.5dPa.s-5.5dPa.s, thereby is easy to fusing and purify hot metal.In addition, according to exemplary embodiment of the present invention, the granularity of lower floor's coverture layer can be 1mm-5mm, and the lower floor coverture of granularity in this number range both conveniently added, again can rapid melting.According to exemplary embodiment of the present invention, preferably, lower floor's coverture can comprise the CaO of 44-48%, the Al of 27-32% by weight percentage
2O
3, 4-8% MgO, the SiO less than 5%
2, 4-10% CaF
2, 3-5% Na
2The inevitable impurity of O and surplus (for example, a small amount of moisture etc.).
The middle level coverture comprises the magnesia substrate hollow bead.The middle level coverture can be made of the magnesia substrate hollow bead.Here, the middle level coverture of the hollow magnesia of employing can effectively be avoided the SiO in the coverture of upper strata
2Diffusion mass transfer in lower floor's coverture.According to exemplary embodiment of the present invention, the magnesia substrate hollow bead can comprise the SiO of 2%-12% by weight percentage
2, 2%-10% MgO, the Al of 1%-10% of CaO, 65%-80%
2O
3, the C of 1%-4% and the inevitable impurity (for example, a small amount of iron oxide) of surplus, preferably, can comprise the SiO of 2-8%
2, 4-8% MgO, the Al of 2-8% of CaO, 74-80%
2O
3, the C of 1-3% and the inevitable impurity of surplus.According to exemplary embodiment of the present invention, the granularity of middle level coverture (for example, the magnesia substrate hollow bead) can be 0.5mm-1.0mm, and this can effectively isolate upper strata coverture and lower floor's coverture.
The upper strata coverture can comprise the SiO of 88%-94% by weight percentage
2, the C of 1%-4% and the inevitable impurity of surplus.Thereby the upper strata coverture with said components can effectively prevent liquid steel temperature decline and prevent the molten steel crust.According to exemplary embodiment of the present invention, preferably, the upper strata coverture can comprise the SiO of 91-94% by weight percentage
2, the C of 1.5-3% and the inevitable impurity of surplus.
In addition, according to exemplary embodiment of the present invention, tundish covering flux can comprise lower floor's coverture of 40%-75%, the middle level coverture of 15%-25% and the upper strata coverture of 10%-35% by weight percentage, preferably, can comprise lower floor's coverture of 50-60%, the middle level coverture of 16-22% and the upper strata coverture of 20-30%.
According to exemplary embodiment of the present invention, the thickness of lower floor's coverture, middle level coverture and upper strata coverture is not subjected to concrete restriction, for example, in practical operation, at first can add lower floor's coverture to make lower floor's coverture cover molten steel fully and can't see the red heat molten steel, then can add according to the addition of lower floor's coverture corresponding middle level coverture and lower floor's coverture.
Tundish covering flux according to an exemplary embodiment of the present invention, be positioned at the alkaline covering agent that contacts with molten steel (that is, lower floor's coverture) on molten steel can effectively absorb in molten steel such as Al
2O
3Non-metallic inclusion, tiny fire resisting material particle, thereby reach the purpose of purify hot metal.Acid coverture (that is, the upper strata coverture) has good heat insulation effect, thereby prevents that effectively molten steel temperature from descending.In addition, by the middle level coverture that is formed by the magnesia substrate hollow bead is set, can prevent effectively that Si in the coverture of upper strata is penetrated in molten steel and makes the Si content increase in molten steel and produce Al in molten steel between upper strata coverture and lower floor's coverture
2O
3Be mingled with.
Further illustrate tundish covering flux of the present invention below in conjunction with example.
Example 1
Comprise by weight percentage 25% upper strata coverture, 16% middle level coverture, lower floor's coverture of 59% according to the tundish covering flux of this example.
In tundish, lower floor's coverture is located immediately at for the production of the high-aluminum steel of TRIP600 high alumina steel plate waterborne, that is, lower floor's coverture directly contacts the high alumina molten steel for the production of TRIP600 high alumina steel plate.Lower floor's coverture comprises 44.2% CaO, 28.0% Al by weight percentage
2O
3, 4.1% MgO, 2.7% SiO
2, 8.43% CaF
2, 3.12% Na
2The inevitable impurity of O and surplus.Be 1296 ℃ according to the fusing point of lower floor's coverture of this example, viscosity is 3.2dPa.s.The granularity of lower floor's coverture is 3.0mm.
The middle level coverture is positioned on lower floor's coverture, and the middle level coverture comprises 5.8% SiO by weight percentage
2, 6.04% CaO, 74.55% MgO, 2.16% Al
2O
3, 2.05% C and the inevitable impurity of surplus.Be 0.6mm according to the granularity of the middle level coverture of this example.
The upper strata coverture is positioned on the coverture of middle level, and the upper strata coverture comprises 91.9% SiO by weight percentage
2, 2.25% C and the inevitable impurity of surplus.
Table 1 shows to use and according to the tundish covering flux of this example, the high alumina molten steel for the production of TRIP600 high alumina steel plate is carried out the contrast of the high-aluminum steel water component before and after tundish metallurgy.
Table 1
As can be seen from Table 1, after use is carried out tundish metallurgy according to the tundish covering flux of this example to the high alumina molten steel, the silicone content of the high alumina molten steel after tundish metallurgy only increases by 0.001% than the silicone content in the high alumina molten steel before tundish metallurgy, increases the silicon amount extremely low.In addition, in whole tundish metallurgy process, molten steel crust phenomenon does not appear in the high alumina molten steel, and molten steel temperature drop is very little, and is therefore, good according to the tundish covering flux heat-insulating property of this example.
Example 2
Comprise by weight percentage 20% upper strata coverture, 20% middle level coverture, lower floor's coverture of 60% according to the tundish covering flux of this example.
In tundish, lower floor's coverture is located immediately at for the production of the high-aluminum steel of TRIP600 high alumina steel plate waterborne, that is, lower floor's coverture directly contacts the high alumina molten steel for the production of TRIP600 high alumina steel plate.Lower floor's coverture comprises 45.2% CaO, 27.0% Al by weight percentage
2O
3, 4.0% MgO, 2.5% SiO
2, 8.02%CaF
2, 3.73% Na
2The inevitable impurity of O and surplus.Be 1305 ℃ according to the fusing point of lower floor's coverture of this example, viscosity is 4.1dPa.s.The granularity of lower floor's coverture is 2.0mm.
The middle level coverture is positioned on lower floor's coverture, and the middle level coverture comprises 6.0% SiO by weight percentage
2, 5.52% CaO, 75.2% MgO, 2.06% Al
2O
3, 2.05% C and the inevitable impurity of surplus.Be 0.5mm according to the granularity of the middle level coverture of this example.
The upper strata coverture is positioned on the coverture of middle level, and the upper strata coverture comprises 92% SiO by weight percentage
2, 1.5% C and the inevitable impurity of surplus.
Table 2 shows to use and according to the tundish covering flux of this example, the high alumina molten steel for the production of TRIP600 high alumina steel plate is carried out the contrast of the high-aluminum steel water component before and after tundish metallurgy.
Table 2
As can be seen from Table 2, after using tundish covering flux according to this example to carry out tundish metallurgy to the high alumina molten steel, the silicone content of the high alumina molten steel before and after tundish metallurgy does not change.In addition, in whole tundish metallurgy process, molten steel crust phenomenon does not appear in the high alumina molten steel, and molten steel temperature drop is very little, and is therefore, good according to the tundish covering flux heat-insulating property of this example.
Example 3
Comprise by weight percentage 23% upper strata coverture, 22% middle level coverture, lower floor's coverture of 55% according to the tundish covering flux of this example.
In tundish, lower floor's coverture is located immediately at for the production of the high-aluminum steel of TRIP600 high alumina steel plate waterborne, that is, lower floor's coverture directly contacts the high alumina molten steel for the production of TRIP600 high alumina steel plate.Lower floor's coverture comprises 46.4% CaO, 29.1% Al by weight percentage
2O
3, 5.2% MgO, 2.6% SiO
2, 6.6% CaF
2, 4.0% Na
2The inevitable impurity of O and surplus.Be 1302 ℃ according to the fusing point of lower floor's coverture of this example, viscosity is 3.8dPa.s.The granularity of lower floor's coverture is 4mm.
The middle level coverture is positioned on lower floor's coverture, and the middle level coverture comprises 4.6% SiO by weight percentage
2, 5.46% CaO, 78.27% MgO, 5.42% Al
2O
3, 2.73% C and the inevitable impurity of surplus.Be 0.6mm according to the granularity of the middle level coverture of this example.
The upper strata coverture is positioned on the coverture of middle level, and the upper strata coverture comprises 93% SiO by weight percentage
2, 2.0% C and the inevitable impurity of surplus.
Table 3 shows to use and according to the tundish covering flux of this example, the high alumina molten steel for the production of TRIP600 high alumina steel plate is carried out the contrast of the high-aluminum steel water component before and after tundish metallurgy.
Table 3
As can be seen from Table 3, after use is carried out tundish metallurgy according to the tundish covering flux of this example to the high alumina molten steel, the silicone content of the high alumina molten steel after tundish metallurgy only increases by 0.001% than the silicone content in the high alumina molten steel before tundish metallurgy, increases the silicon amount extremely low.In addition, in whole tundish metallurgy process, molten steel crust phenomenon does not appear in the high alumina molten steel, and molten steel temperature drop is very little, and is therefore, good according to the tundish covering flux heat-insulating property of this example.
Example 4
Comprise by weight percentage 24% upper strata coverture, 20% middle level coverture, lower floor's coverture of 56% according to the tundish covering flux of this example.
In tundish, lower floor's coverture is located immediately at for the production of the high-aluminum steel of TRIP600 high alumina steel plate waterborne, that is, lower floor's coverture directly contacts the high alumina molten steel for the production of TRIP600 high alumina steel plate.Lower floor's coverture comprises 46.9% CaO, 28.02% Al by weight percentage
2O
3, 7.4% MgO, 4.1% SiO
2, 8.3% CaF
2, 3.6% Na
2The inevitable impurity of O and surplus.Be 1311 ℃ according to the fusing point of lower floor's coverture of this example, viscosity is 2.8dPa.s.The granularity of lower floor's coverture is 3mm.
The middle level coverture is positioned on lower floor's coverture, and the middle level coverture comprises 3.5% SiO by weight percentage
2, 7.1% CaO, 79.2% MgO, 3.14% Al
2O
3, 1.65% C and the inevitable impurity of surplus.Be 0.5mm according to the granularity of the middle level coverture of this example.
The upper strata coverture is positioned on the coverture of middle level, and the upper strata coverture comprises 92.7% SiO by weight percentage
2, 2.2% C and the inevitable impurity of surplus.
Table 4 shows to use and according to the tundish covering flux of this example, the high alumina molten steel for the production of TRIP600 high alumina steel plate is carried out the contrast of the high-aluminum steel water component before and after tundish metallurgy.
Table 4
As can be seen from Table 4, after use is carried out tundish metallurgy according to the tundish covering flux of this example to the high alumina molten steel, the silicone content of the high alumina molten steel after tundish metallurgy only increases by 0.001% than the silicone content in the high alumina molten steel before tundish metallurgy, increases the silicon amount extremely low.In addition, in whole tundish metallurgy process, molten steel crust phenomenon does not appear in the high alumina molten steel, and molten steel temperature drop is very little, and is therefore, good according to the tundish covering flux heat-insulating property of this example.
Example 5
Comprise by weight percentage 20% upper strata coverture, 21% middle level coverture, lower floor's coverture of 59% according to the tundish covering flux of this example.
In tundish, lower floor's coverture is located immediately at for the production of the high-aluminum steel of TRIP600 high alumina steel plate waterborne, that is, lower floor's coverture directly contacts the high alumina molten steel for the production of TRIP600 high alumina steel plate.Lower floor's coverture comprises 47.3% CaO, 27.8% Al by weight percentage
2O
3, 5.5% MgO, 2.8% SiO
2, 8.92% CaF
2, 4.01% Na
2The inevitable impurity of O and surplus.Be 1296 ℃ according to the fusing point of lower floor's coverture of this example, viscosity is 2.71dPa.s.The granularity of lower floor's coverture is 3.0mm.
The middle level coverture is positioned on lower floor's coverture, and the middle level coverture comprises 4.3% SiO by weight percentage
2, 6.01% CaO, 78.4% MgO, 3.11% Al
2O
3, 2.09% C and the inevitable impurity of surplus.Be 0.5mm according to the granularity of the middle level coverture of this example.
The upper strata coverture is positioned on the coverture of middle level, and the upper strata coverture comprises 94.0% SiO by weight percentage
2, 1.6% C and the inevitable impurity of surplus.
Table 5 shows to use and according to the tundish covering flux of this example, the high alumina molten steel for the production of TRIP600 high alumina steel plate is carried out the contrast of the high-aluminum steel water component before and after tundish metallurgy.
Table 5
As can be seen from Table 5, after using tundish covering flux according to this example to carry out tundish metallurgy to the high alumina molten steel, the silicone content of the high alumina molten steel after tundish metallurgy does not change.In addition, in whole tundish metallurgy process, molten steel crust phenomenon does not appear in the high alumina molten steel, and molten steel temperature drop is very little, and is therefore, good according to the tundish covering flux heat-insulating property of this example.
Claims (10)
1. a tundish covering flux, is characterized in that, described tundish covering flux comprises:
Lower floor's coverture is positioned on molten steel and contacts molten steel, and lower floor's coverture comprises the CaO of 40%-50%, the Al of 25%-35% by weight percentage
2O
3, 1%-8% MgO, the SiO less than 5%
2, 1%-10% CaF
2, 1%-5% Na
2The inevitable impurity of O and surplus;
The middle level coverture is positioned on lower floor's coverture, and the middle level coverture comprises the magnesia substrate hollow bead;
The upper strata coverture is positioned on the coverture of middle level, and the upper strata coverture comprises the SiO of 88%-94% by weight percentage
2, the C of 1%-4% and the inevitable impurity of surplus.
2. tundish covering flux according to claim 1, is characterized in that, described tundish covering flux comprises lower floor's coverture of 40%-75%, the middle level coverture of 15%-25% and the upper strata coverture of 10%-35% by weight percentage.
3. tundish covering flux according to claim 2, is characterized in that, described tundish covering flux comprises lower floor's coverture of 50-60%, the middle level coverture of 16-22% and the upper strata coverture of 20-30% by weight percentage.
4. tundish covering flux according to claim 1, is characterized in that, lower floor's coverture comprises the CaO of 44%-48%, the Al of 27%-32% by weight percentage
2O
3, 4%-8% MgO, the SiO less than 5%
2, 4%-10% CaF
2, 3%-5% Na
2The inevitable impurity of O and surplus.
5. tundish covering flux according to claim 1, is characterized in that, the fusing point of lower floor's coverture is 1280 ℃-1320 ℃, and viscosity is 1.5dPa.s-5.5dPa.s.
6. tundish covering flux according to claim 1, is characterized in that, the granularity of lower floor's coverture is 1mm-5mm.
7. tundish covering flux according to claim 1, is characterized in that, the magnesia substrate hollow bead comprises the SiO of 2%-12% by weight percentage
2, 2%-10% MgO, the Al of 1%-10% of CaO, 65%-80%
2O
3, the C of 1%-4% and the inevitable impurity of surplus.
8. tundish covering flux according to claim 7, is characterized in that, the magnesia substrate hollow bead comprises the SiO of 2-8% by weight percentage
2, 4-8% MgO, the Al of 2-8% of CaO, 74-80%
2O
3, the C of 1-3% and the inevitable impurity of surplus.
9. tundish covering flux according to claim 1, is characterized in that, the granularity of middle level coverture is 0.5mm-1.0mm.
10. tundish covering flux according to claim 1, is characterized in that, the upper strata coverture comprises the SiO of 91-94% by weight percentage
2, the C of 1.5-3% and the inevitable impurity of surplus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310060569.2A CN103111592B (en) | 2013-02-26 | 2013-02-26 | Tundish covering agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103341606A (en) * | 2013-07-03 | 2013-10-09 | 北京科技大学 | High-magnesium covering agent material capable of being used for tundish and preparing method thereof |
| CN103639383A (en) * | 2013-11-29 | 2014-03-19 | 攀钢集团研究院有限公司 | Pre-melting-type tundish covering agent and aluminum killed steel continuous casting method |
| CN108145108A (en) * | 2017-12-30 | 2018-06-12 | 蒋文明 | A kind of tundish covering flux |
| CN115229139A (en) * | 2022-06-15 | 2022-10-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail steel continuous casting tundish covering agent and adding method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5332418A (en) * | 1991-03-22 | 1994-07-26 | Daussan Et Compagnie | Covering for molten metal and process for producing the same |
| US5366535A (en) * | 1992-12-07 | 1994-11-22 | Premier Services Corporation | Basic tundish covering compound |
| DE10105620A1 (en) * | 2001-02-08 | 2002-09-12 | Thyssenkrupp Stahl Ag | Production of a slag layer on the surface of metal melt comprises introducing slag-forming material into a tundish in the form of a flat solid covering body over the metal melt until it floats on the melt |
| CN1416979A (en) * | 2001-11-06 | 2003-05-14 | 上海宝谊保温材料有限公司 | Double-layered alkali grain covering agent for middle ladle |
| CN101347823A (en) * | 2008-09-11 | 2009-01-21 | 首钢总公司 | Method for using double-layer continuous casting pouring box covering agent |
| CN101486587A (en) * | 2009-01-04 | 2009-07-22 | 攀钢集团研究院有限公司 | Double-layer tundish covering agent |
| CN101653819A (en) * | 2009-05-25 | 2010-02-24 | 莱芜钢铁股份有限公司 | Continuous casting tundish hollow particle carbon-free covering agent and preparation method thereof |
| CN101758176A (en) * | 2010-01-21 | 2010-06-30 | 山西太钢不锈钢股份有限公司 | Double-layer tundish covering agent |
-
2013
- 2013-02-26 CN CN201310060569.2A patent/CN103111592B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5332418A (en) * | 1991-03-22 | 1994-07-26 | Daussan Et Compagnie | Covering for molten metal and process for producing the same |
| US5366535A (en) * | 1992-12-07 | 1994-11-22 | Premier Services Corporation | Basic tundish covering compound |
| DE10105620A1 (en) * | 2001-02-08 | 2002-09-12 | Thyssenkrupp Stahl Ag | Production of a slag layer on the surface of metal melt comprises introducing slag-forming material into a tundish in the form of a flat solid covering body over the metal melt until it floats on the melt |
| CN1416979A (en) * | 2001-11-06 | 2003-05-14 | 上海宝谊保温材料有限公司 | Double-layered alkali grain covering agent for middle ladle |
| CN101347823A (en) * | 2008-09-11 | 2009-01-21 | 首钢总公司 | Method for using double-layer continuous casting pouring box covering agent |
| CN101486587A (en) * | 2009-01-04 | 2009-07-22 | 攀钢集团研究院有限公司 | Double-layer tundish covering agent |
| CN101653819A (en) * | 2009-05-25 | 2010-02-24 | 莱芜钢铁股份有限公司 | Continuous casting tundish hollow particle carbon-free covering agent and preparation method thereof |
| CN101758176A (en) * | 2010-01-21 | 2010-06-30 | 山西太钢不锈钢股份有限公司 | Double-layer tundish covering agent |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103341606A (en) * | 2013-07-03 | 2013-10-09 | 北京科技大学 | High-magnesium covering agent material capable of being used for tundish and preparing method thereof |
| CN103341606B (en) * | 2013-07-03 | 2015-02-11 | 北京科技大学 | High-magnesium covering agent material capable of being used for tundish and preparing method thereof |
| CN103639383A (en) * | 2013-11-29 | 2014-03-19 | 攀钢集团研究院有限公司 | Pre-melting-type tundish covering agent and aluminum killed steel continuous casting method |
| CN103639383B (en) * | 2013-11-29 | 2015-10-21 | 攀钢集团研究院有限公司 | The continuous cast method of pre-melted type tundish covering flux and aluminum killed steel |
| CN108145108A (en) * | 2017-12-30 | 2018-06-12 | 蒋文明 | A kind of tundish covering flux |
| CN115229139A (en) * | 2022-06-15 | 2022-10-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail steel continuous casting tundish covering agent and adding method thereof |
| CN115229139B (en) * | 2022-06-15 | 2024-02-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail steel continuous casting tundish covering agent and adding method thereof |
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