CN109454210A - A kind of ultra-thin band double-layer tundish covering agent - Google Patents
A kind of ultra-thin band double-layer tundish covering agent Download PDFInfo
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- CN109454210A CN109454210A CN201811578170.2A CN201811578170A CN109454210A CN 109454210 A CN109454210 A CN 109454210A CN 201811578170 A CN201811578170 A CN 201811578170A CN 109454210 A CN109454210 A CN 109454210A
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- coverture
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- tundish
- upper layer
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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
A kind of ultra-thin band double-layer tundish covering agent is related to metallurgical technology field, and upper layer and lower layer coverture is the hollow particle product of mist projection granulating, and the chemical analysis of upper layer coverture is: 45.0 ~ 55.0wt% of CaO, SiO2 18.0~24.0wt%、MgO 14.0~18.0 wt%、Al2O3≤1.9wt%、CGu7.5 ~ 11.5wt% and inevitable surplus impurity, fusing point are greater than 1450 DEG C；The chemical analysis of lower layer's coverture is: 25.0 ~ 31.0wt% of CaO, SiO2 27.0~37.0wt%、MgO 13.0~18.0 wt%、Al2O3≤ 1.9wt%, (Li2O+Na2O) 13.0 ~ 17.0 wt%, CGu≤ 0.5 wt% and inevitable surplus impurity, 1150 ~ 1250 DEG C of fusing point；Products characteristics are light specific gravities, and the carbon containing lower layer in upper layer is few, prevent carburetting from keeping the temperature again, upper and lower level Al2O3Content is low, fully absorbs field trash, and upper layer fusing point is high, completely cuts off air thermal preservation, and lower layer's fusing point is low, can rapid melting, prevent carbon containing upper layer and steel contacts carburetting.
Description
Technical field
The present invention relates to metallurgical technology field, in particular to a kind of ultra-thin band double-layer tundish covering agent and its preparation side
Method.
Background technique
Ultra-thin band production technology is most potential one metallurgical forward position new technology of current steel and iron industry and the world
Major iron and steel enterprise puts into a kind of short route that huge fund competitively develops, low energy consumption, with low investment, at low cost and environmentally protective one after another
New process.
The ultra-thin band technological process of production is: molten steel passes through the ladle → tundish → changeover portion → mouth of a river → casting roll → control gas
Atmosphere → pinch roller → hot rolling rack → withdrawing roll → is sheared → is batched.Only 60 meters of distance from tundish to coiling machine, is equivalent to plate
/ 10th of base casting machine.It is mainly mild steel that ultrathin strip, which produces steel grade, is poured the steel time 80 minutes or so, and poring rate 60 ~
70m/min.Ultra-thin band is exactly to invent thus with double-layer tundish covering agent.
With the continuous improvement required Molten Steel Cleanliness, tundish is no longer regarded as ladle and knot by metallargist
A simple refractory material transition container between brilliant device, and as a refining vessel and continually develop its metallurgical function
Can, wherein it is a kind of most effective technology of tundish metallurgy that coverture is added on tundish molten steel face.Cladding among ultra-thin band
The effect of lid agent mainly includes (1) adiabatic heat-insulation, reduces molten steel temperature drop；(2) completely cut off air, prevent secondary oxidation of steel；(3) it inhales
The non-metallic inclusion floated at slag interface is enclosed, molten steel is purified；(4) molten steel recarburization etc. is prevented.
Tundish covering flux product mainly has four major class at present, first is that acid tundish carries out lid agent, using carbonization rice husk as generation
Table, heat insulation effect is good, because containing SiO2, the oxides such as MnO, FeO be affected to steel quality, anti-secondary oxidation performance compared with
Difference, operation dust are big；Second is that neutral tundish carries out lid agent, with CaO-Al203-Si02Class is representative, low cost, to steel quality
It interferes larger；Third is that alkaline tundish covering flux, using MgO matter raw material as substrate, due to close with tundish magnesia coating property,
Preferably to coating protection, preferably, application is wider for performance and in terms of deoxidization desulfuration and absorption, but is easy crust,
It is unfavorable to intermediate package operation；Fourth is that the double-deck slag type tundish covering flux, comprehensive performance are preferable.
Before making the present invention, it although the multinomial patent of invention in relation to tundish covering flux has been disclosed, does not apply
In on ultra-thin band tundish.
" double-layered alkali grain covering agent for middle ladle " patent of invention of Patent No. ZL 01132125.3, provides one
Kind double-layered alkali grain tundish thermal-insulating covering agent, but fail to provide the coverture in heat preservation, absorption Al2O3Nonmetal inclusion
Object, the quantized data for preventing or reducing molten steel recarburization amount etc., and useless apply in the production of ultra-thin band.
" application method of double-layer continuous casting tundish covering flux " patent of invention of Publication No. CN101347823, provides
A kind of application method of double-layer continuous casting tundish covering flux, wherein gap-free atom molten steel is entirely pouring the average carbon increasing amount in secondary
For 5 × 10-4%, total oxygen content is in 30 × 10-4% hereinafter, but failing to provide the coverture in heat insulation effect and absorption in steel
Al2O3Quantized data in terms of non-metallic inclusion, and it is useless apply ultra-thin band production in.
Publication number 104858382B " a kind of tundish covering flux and application ", the tundish covering flux contains (Na2O+
Li2O): 8.3%, although containing Na2O and Li2O, coverture is single layer, what non-hollow was granulated, without carburetting situation
Quantized data adds TiO2, B2O3Equal elements, are confined to apply on steel grade containing Ti.
Publication number 103111592B " tundish covering flux " has invented a kind of tundish covering flux.The tundish covering flux packet
Include: lower layer's coverture on molten steel and contacts molten steel；Middle layer coverture is located on lower layer's coverture, and middle layer coverture includes
Magnesia substrate hollow bead；Upper layer coverture is located on the coverture of middle layer.Three layers of this coverture point, in actual production excessively
Complexity, the upper and lower are not hollow particles, and molten steel temperature drop does not have data quantization.
Patent CN101486587B " double-layer tundish covering agent " has invented the intermediate cladding of the bilayer that can prevent the top of the slag from crusting
Lid agent, still, particle non-hollow particle, isolation air thermal preservation effect is bad, in addition, Al2O3Content height to absorb field trash not
Benefit.
In conclusion the field trash that single acid coverture absorption is floated is unfavorable, cylinder-packing is corroded serious；Magnesia covering
Agent, alkaline covering agent are easy crust, and heat insulation effect is bad；Carbon-free covering agent heat insulation effect is bad.Especially ultra-thin band production is every
Furnace pours the steel time at 80 minutes or so, and coverture is not added in transition, and above-mentioned tundish covering flux is unable to satisfy among ultra-thin band
Metallurgical performance required for wrapping.
Summary of the invention
Present invention aims to overcome that above-mentioned the shortcomings of the prior art, provides a kind of double-deck intermediate cladding of ultra-thin band
Lid agent.Its main feature is that the double-deck coverture is all hollow particle product, light specific gravity completely cuts off air thermal preservation, prevents secondary oxidation；Lower layer contains
Carbon amounts is few, and upper layer is carbon containing, that is, prevents carburetting from keeping the temperature again；Upper and lower level Al2O3Content is low, can fully absorb field trash；Upper layer alkali
Degree high energy, which effectively adsorbs, to be mingled with；Upper layer covers fusing point height, completely cuts off air thermal preservation, prevents secondary oxidation；Lower layer's fusing point is low, can be fast
Fast thawing prevents carbon containing upper layer and steel contacts carburetting, containing fluxing agent, is conducive to absorption and is mingled with；Upper and lower level all contains centainly
MgO can protect intermediate cylinder-packing.
Specifically it is such to a kind of implementation: ultra-thin band double-layer tundish covering agent, it is characterised in that upper layer and lower layer are covered
Lid agent is the hollow particle product of mist projection granulating, and the chemical analysis of upper layer coverture is by mass percentage are as follows: CaO 45.0 ~
55.0wt%、 SiO2 18.0~24.0wt%、MgO 14.0~18.0 wt%、 Al2O3 ≤1.9wt%、 CGu7.5 ~ 11.5wt% and
Inevitable surplus impurity, fusing point are greater than 1450 DEG C；The chemical analysis of lower layer's coverture is by mass percentage are as follows: CaO
25.0~31.0wt%、 SiO2 27.0~37.0wt%、MgO 13.0~18.0 wt%、 Al2O3 ≤ 1.9wt%, (Li2O+Na2O)
13.0~17.0 wt%、 CGu≤ 0.5 wt% and inevitable surplus impurity, 1150 ~ 1250 DEG C of fusing point.
Preparation method the following steps are included: will enter the acceptable material of factory through formula design upper and lower layer coverture chemical component,
Fusing point is covered by ingredient, slurrying, mist projection granulating, screening, cooling, detection, packaging to get to the double-deck tundish of ultra-thin band
Agent.
The reasonable control of tundish covering flux ingredient of the present invention refers to reach tundish covering flux and absorb non-gold
Belong to field trash and CaO-SiO has been selected according to Silicate Phase Diagram2-Al2O3- MgO is as basic slag system, in this regional scope,
Al2O3It is strong to absorb field trash ability by≤1.9wt%.Purify the theory of molten steel:
3(FeO)+2 (Al)=3 (Fe)+(Al2O3) △G0=-853700+239.9T
3(SiO2)+4 (Al)=3 (Si)+2 (Al2O3) △G0=-219400+35.7T
3(CaO)+2 (Al)+3 (S)=3 (CaS)+(Al2O3)
The reasonable selection of tundish covering flux ingredient of the present invention refers to carbon, and the effect of carbon mainly controls burn-off rate,
Increase adiabatic heat insulating effect, effectively control sintering, but height is carbon containing to be easy to cause molten steel recarburization.For this purpose, lower layer's coverture is done
Few at phosphorus content, it is firstly added tundish lower layer coverture when starting casting, prevents carburetting when with steel contacts；For up to
Long-time is prevented to be poured tundish temperature drop to heat preservation, the burn-off rate that isolation air prevents secondary oxidation, effectively control coverture
And prevent coverture from crusting, the top-level design that tundish covers is contained into carbon, additional amount control is in 7.5 ~ 11.5wt%, casting
Upper layer coverture is added after coverture lower layer is added in the process, avoids directly contacting upper layer with molten steel, prevents coverture
Carburetting.
The reasonable control of tundish covering flux ingredient of the present invention refers to increase CaO content, and basicity increases, FeO's
Activity coefficient reduces, and the advantageous molten steel absorption of high alkalinity is mingled with, while wrapping interior molten steel in inhibition and returning sulphur.
The reasonable control of tundish covering flux ingredient of the present invention, which refers to not add for tundish covering flux upper layer, to be helped
Flux, coverture fusing point is high, is difficult to melt greater than 1450 DEG C, forms isolation layer, has heat insulation effect, while preventing molten steel secondary
It aoxidizes, covering agent consumption in reduction.
The reasonable control of tundish covering flux ingredient of the present invention refers to for tundish covering flux lower layer rapid melting,
Melting layer is formed, prevents upper layer coverture from directly contacting with molten steel, with CaO-SiO2-Al2O3- MgO be used as basis material, then plus
Enter (Li2O+Na2It O is) fluxing agent, 1150 ~ 1250 DEG C of lower layer's fusing point；Li2O+Na2The addition of O fluxing agent reduces the molten of slag
Point and viscosity, improve Al2O3Saturation solubility, be conducive to absorb Al2O3Field trash.
The reasonable control of tundish covering flux ingredient of the present invention refers to protect intermediate cylinder-packing, MgO is added, with magnesium
Matter and the calcareous cylinder-packing compatibility of magnesium are high, the erosion to magnesia tundish lining can be substantially reduced, to improve making for tundish
Use the service life.
The present invention manufactures tundish covering flux using the production method of mist projection granulating, granularity 0.15 ~ 1.0mm hollow particle
Quality percentage accounting is greater than 85%, 0.65 ~ 0.85g/cm3 of particle specific gravity.The bulk density for reducing coverture, improves spreadability.It is spraying
The hollow spheres of granulation can form heat insulation layer, can be effectively reduced the outside heat transfer rate of molten steel, play the role of heat-insulation and heat-preservation.
Tundish covering flux good heat insulating not only can be reduced liquid steel temperature loss, keep constant temperature casting, reduce slag consumption, and good
Thermal insulation property can also mitigate coverture encrustation phenomena.
One of the advantages of the present invention is that two layers of coverture is all hollow bead, and bulk density is light；Hollow bead improves paving
Malleability.The hollow spheres of mist projection granulating can form heat insulation layer, can be effectively reduced the outside heat transfer rate of molten steel, heat-insulation and heat-preservation effect
Fruit is good.
Advantages of the present invention second is that coverture is divided into upper layer and lower layer, lower layer's coverture phosphorus content is few, is starting to be poured
When be firstly added tundish lower layer coverture, prevent carburetting when with steel contacts；Free carbon is contained on the upper layer of tundish covering, has
Play the role of keeping the temperature and prevent coverture from crusting, prevents from being poured tundish temperature drop for a long time.
Advantages of the present invention third is that coverture Al2O3Content is very low, is conducive to absorb Al2O3It is mingled with.
Advantages of the present invention fourth is that upper layer coverture high alkalinity, be conducive to absorb and be mingled with, anti-non-return sulphur.
Advantages of the present invention fifth is that upper layer coverture fusing point is high, be difficult to melt, completely cut off air, heat preservation prevents secondary oxygen
Change, while also reducing the consumption of middle covering agent.
Advantages of the present invention sixth is that lower layer's coverture add Li2O、Na2The fluxing agents such as O, coverture fusing point is low, is conducive to
Melting layer is quickly formed, prevents carbon containing upper layer from directly contacting with molten steel, prevents carburetting；Addition cosolvent is conducive to absorb Al2O3Folder
It is miscellaneous.
Advantages of the present invention seventh is that coverture all contains certain MgO, it is high with the calcareous cylinder-packing compatibility of magnesia and magnesium, prevent
Only coverture corrodes cylinder-packing, protects intermediate cylinder-packing, improves the service life of tundish.
Specific embodiment
Below by way of specific embodiment, the present invention is further described.
Embodiment 1:
The acceptable material for entering factory is formulated design, ingredient, slurrying, mist projection granulating, screening, cooling, detection, packaging, it is manufactured
Ultra-thin band is as follows with double-layer tundish covering agent physical and chemical index: table 1
The product produced is used on the tundish of ultrathin strip production line, steel grade is carbon content 0.02 ~ 0.05%
Mild steel, average every furnace pour the steel time 82 minutes, average poring rate 69m/min.
When great Bao is opened and poured 5 minutes or so, tundish covering flux lower layer 90Kg is added, as casting is with addition tundish
Coverture upper layer 120Kg, the second furnace according to circumstances add lower layer 20Kg, and 30Kg is added on upper layer.Third, four furnaces respectively add upper layer
20Kg.It is poured 4 furnace steel altogether.
Use result: table 2
After tundish is added in the double-deck coverture, spreadability is good on molten steel face.As the increase top of the slag of casting sequence does not go out
Existing encrustation phenomena, packet splicing, the resistance to material of tundish do not corrode significantly bits after casting.From table 2 it can be seen that using double
Layer coverture temperature drop is very low, and within zone of reasonableness, field trash meets steel grade requirement for carburetting, and consumption is little.
Embodiment 2:
The acceptable material for entering factory is formulated design, ingredient, slurrying, mist projection granulating, screening, cooling, detection, packaging, it is manufactured
Ultra-thin band is as follows with the double-deck coverture physical and chemical index: table 3
The product produced is used on the tundish of ultrathin strip production line, steel grade is carbon content 0.02 ~ 0.05%
Mild steel, average every furnace pour the steel time 78 minutes, average poring rate 67m/min.
When great Bao is opened and poured 5 minutes, tundish covering flux lower layer 90Kg is added, as casting is with addition tundish covering
Agent upper layer 120Kg, the second furnace add lower layer 20Kg, and 30Kg is added on upper layer.Each furnace adds upper layer 20Kg after three furnaces.It is poured 5 altogether
Furnace.
Use result: table 4
After tundish is added in the double-deck coverture, spreadability is good on molten steel face, as the increase top of the slag of casting sequence does not go out
Existing encrustation phenomena, packet splicing, the resistance to material of tundish do not corrode significantly bits after casting.From table 4, it can be seen that using double
Layer coverture temperature drop is very low, and within zone of reasonableness, field trash meets steel grade requirement, consumption very little for carburetting.
Embodiment 3:
The acceptable material for entering factory is formulated design, ingredient, slurrying, mist projection granulating, screening, cooling, detection, packaging, it is manufactured
Ultra-thin band is as follows with the double-deck coverture physical and chemical index: table 5
The product produced is used on the tundish of ultrathin strip production line, steel grade carbon content 0.02 ~ 0.05% it is low
Carbon steel, average every furnace pour the steel time 84 minutes, average poring rate 64m/min.
When great Bao is opened and poured 5 minutes or so, tundish covering flux lower layer 90Kg is added, as casting is with addition tundish
Coverture upper layer 120Kg, the second furnace according to circumstances add lower layer 20Kg, and 30Kg is added on upper layer.Each furnace adds upper layer after three furnaces
30Kg.It is poured 6 furnaces altogether.
Use result: table 6
After tundish is added in the double-deck coverture, spreadability is good on molten steel face.As the increase top of the slag of casting sequence does not go out
Existing encrustation phenomena, packet splicing, the resistance to material of tundish do not corrode significantly bits after casting.As can be seen from Table 6, using double
Layer coverture temperature drop very little, within zone of reasonableness, field trash meets steel grade requirement, consumption very little for carburetting.
Embodiment 4:
The acceptable material for entering factory is formulated design, ingredient, slurrying, mist projection granulating, screening, cooling, detection, packaging, it is manufactured
Ultra-thin band is as follows with the double-deck coverture physical and chemical index: table 7
The product produced is used on the tundish of ultrathin strip production line, steel grade is carbon content 0.02 ~ 0.05%
Mild steel, average every furnace pour the steel time 86 minutes, average poring rate 61m/min.
When great Bao is opened and poured 5 minutes or so, tundish covering flux lower layer 90Kg is added, as casting is with addition tundish
Coverture upper layer 120Kg, the second furnace according to circumstances add lower layer 20Kg, and 40Kg is added on upper layer, and every furnace adds 30Kg after three furnaces
Upper layer coverture.6 furnaces are poured altogether.
Use result: table 8
After tundish is added in the double-deck coverture, spreadability is good on molten steel face, as the increase top of the slag of casting sequence does not occur
Encrustation phenomena, packet splicing, the resistance to material of tundish do not corrode significantly bits after casting.As can be seen from Table 8, using bilayer
Coverture temperature drop very little, within zone of reasonableness, field trash meets steel grade requirement, consumption very little for carburetting.
Embodiment 5:
The acceptable material for entering factory is formulated design, ingredient, slurrying, mist projection granulating, screening, cooling, detection, packaging, it is manufactured
Ultra-thin band is as follows with the double-deck coverture physical and chemical index: table 9
The product produced is used on the tundish of ultrathin strip production line, steel grade carbon content 0.02 ~ 0.05% it is low
Carbon steel, average every furnace pour the steel time 86 minutes, average poring rate 62m/min.
When great Bao is opened and poured 5 minutes or so, tundish covering flux lower layer 90Kg is added, as casting is with addition tundish
Coverture upper layer 130Kg, the second furnace according to circumstances add lower layer 30Kg, and 30Kg is added on upper layer, and every furnace adds upper layer after three furnaces
30Kg.It has been poured 7 furnaces altogether.
Use result: table 10
After tundish is added in the double-deck coverture, spreadability is good on molten steel face.As the increase top of the slag of casting sequence does not go out
Existing encrustation phenomena, packet splicing, the resistance to material of tundish do not corrode significantly bits after casting.As can be seen from Table 10, it uses
The double-deck coverture temperature drop very little, within zone of reasonableness, field trash meets steel grade requirement, consumption very little for carburetting.
Claims (4)
1. a kind of ultra-thin band double-layer tundish covering agent, it is characterised in that upper layer and lower layer coverture is hollow of mist projection granulating
Granule product, the chemical analysis of upper layer coverture is by mass percentage are as follows: 45.0 ~ 55.0wt% of CaO, SiO2 18.0~
24.0wt%、MgO 14.0~18.0 wt%、 Al2O3 ≤1.9wt%、 CGu7.5 ~ 11.5wt% and inevitable surplus are miscellaneous
Matter, fusing point are greater than 1450 DEG C；The chemical analysis of lower layer's coverture is by mass percentage are as follows: 25.0 ~ 31.0wt% of CaO, SiO2
27.0~37.0wt%、MgO 13.0~18.0 wt%、 Al2O3 ≤ 1.9wt%, (Li2O+Na2O) 13.0 ~ 17.0 wt%, CGu≤
0.5 wt% and inevitable surplus impurity, 1150 ~ 1250 DEG C of fusing point.
2. a kind of ultra-thin band double-layer tundish covering agent according to claim 1, it is characterised in that preparation method includes
Following steps: will enter the acceptable material of factory through formula and design upper and lower layer coverture chemical component, fusing point, by ingredient, slurrying,
Mist projection granulating, screening, cooling, detection, packaging are to get to ultra-thin band double-layer tundish covering agent.
3. a kind of ultra-thin band double-layer tundish covering agent according to claim 2, it is characterised in that granularity 0.15 ~
The quality percentage accounting of 1.0mm hollow particle is greater than 85%.
4. a kind of ultra-thin band double-layer tundish covering agent according to claim 2 or 3, it is characterised in that particle specific gravity
0.65~0.85g/cm3。
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110527859A (en) * | 2019-09-17 | 2019-12-03 | 四川兰德高科技产业有限公司 | Aluminium alloy free-floride is without the granular refining agent of sodium hollow ball shape and preparation method and application |
| CN111500919A (en) * | 2020-05-29 | 2020-08-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of high-cleanliness high-titanium low-carbon steel |
| CN113337670A (en) * | 2021-05-21 | 2021-09-03 | 武汉钢铁有限公司 | Molten steel heat-preservation covering agent capable of supplementing heat |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110527859A (en) * | 2019-09-17 | 2019-12-03 | 四川兰德高科技产业有限公司 | Aluminium alloy free-floride is without the granular refining agent of sodium hollow ball shape and preparation method and application |
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| CN111500919A (en) * | 2020-05-29 | 2020-08-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of high-cleanliness high-titanium low-carbon steel |
| CN111500919B (en) * | 2020-05-29 | 2021-12-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of high-cleanliness high-titanium low-carbon steel |
| CN113337670A (en) * | 2021-05-21 | 2021-09-03 | 武汉钢铁有限公司 | Molten steel heat-preservation covering agent capable of supplementing heat |
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|---|---|
| CN109454210B (en) | 2020-10-20 |
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