CN101885043A - High-casting speed mold flux - Google Patents

High-casting speed mold flux Download PDF

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Publication number
CN101885043A
CN101885043A CN2009100279019A CN200910027901A CN101885043A CN 101885043 A CN101885043 A CN 101885043A CN 2009100279019 A CN2009100279019 A CN 2009100279019A CN 200910027901 A CN200910027901 A CN 200910027901A CN 101885043 A CN101885043 A CN 101885043A
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percent
slag
casting speed
covering slag
sio
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CN2009100279019A
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CN101885043B (en
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李玉娣
文光华
江中块
唐萍
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Shanghai Meishan Iron and Steel Co Ltd
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Shanghai Meishan Iron and Steel Co Ltd
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Abstract

The invention relates to a continuous casting mold flux, in particular to a high-casting speed mold flux, which solves the problem that the flux consumption is low and the mold bonding alarm rate is high when the casting speed is higher than 1.2 m/min in the prior art. The high-casting speed mold flux comprises the following components in percentage by weight: 32.0 to 34.0 percent of SiO2, 39.0 to 41.0 percent of CaO, 4.0 to 5.0 percent of Al2O3, 7.5 to 9.5 percent of Na2O, 5.0 to 6.0 percent of F, 2.0 to 3.0 percent of MgO, 0.5 to 1.5 percent of Fe2O3, 2.5 to 3.0 percent of C, 0.7 to 1.0 percent of Li2O and 0.9 to 1.4 percent of B2O3. A binary basicity (CaO/SiO2) in the flux is 1.15 to 1.25. The high-casting speed mold flux is mainly used for protecting the high-casting speed mold for slab caster continuous casting peritectic steel under electromagnetic brake technology.

Description

A kind of high-casting speed mold flux
Technical field:
The present invention relates to continuous crystallizer protecting slag, particularly a kind of high-casting speed mold flux, the high pulling rate crystallizer that is mainly used in electromagnetic brake technology lower plate billet casting machine continuous casting peritectic steel is protected.
Background technology:
High efficiency continuous casting is still represented the mainstream technology direction of continuous casting development at present.So-called high efficiency continuous casting typically refers to higher than conventional continuous casting production efficiency, is core with high pulling rate, based on high-quality, the production of zero defect strand, realizes the high continuous casting system technology of watering rate, high operating rate that connects, and its core is high pulling rate technology.But the realization of high casting speed continuous casting technology has brought many new difficult problems to continuous casting process; one of them is exactly the increase along with poring rate; the continuous casting covering slag relative consumption reduces; cause between crystallizer wall and the solidified shell lubricated insufficient, conduct heat inhomogeneous; casting billet surface defective and sticker type breakout accident take place easily, especially pour into a mould peritectic steel.In order to solve the surface longitudinal crack quality problems of easy appearance of slab cast peritectic steel, prior art is to adopt high basicity (CaO/SiO from the covering slag angle 2Than), high crystallization than and high setting temperature (being called for short three high slags) realize " slow cooling " of crystallizer meniscus surface area, covering slag typical case chemical composition (percentage by weight): CaO 44%, SiO 234%, Na 2O 7%, F -9%, Al 2O 33%, C 3%, dual alkalinity (CaO/SiO 2) be 1.30; Physical property: 1142 ℃ of fusing points, 1300 ℃ viscosity 0.065PaS, 1198 ℃ of setting temperatures, slag membrane crystallization ratio reaches 100%.Though; this three high slags can be controlled the slab surface longitudinal crack effectively; but because it is slow to conduct heat at the crystallizer meniscus surface area; make that the base shell is thin, it is little to shrink; the inflow of covering slag is little, adds that the high setting temperature of covering slag has also reduced the melt cinder film thickness of covering slag in crystallizer, makes that the frictional force between base shell and the crystallizer increases; strengthened crystallizer bonding warning probability, so the pulling rate of sheet billet continuous casting peritectic steel is lower than mild steel usually.
For cast section: 210 * 900～1300mm 2Slab caster.In order to guarantee under the high pulling rate condition liquid level stabilizing in the crystallizer, not rolling up slag that crystallizer has adopted the electromagnetic braking control technology.More do not adopt in the electromagnetic braking crystallizer liquid level regional temperature to want high 5～10 ℃ by relatively find using electromagnetic braking, the formation speed that explanation has slowed down the base shell in the high degree of superheat of crystallizer meniscus molten steel helps reducing the occurrence probability of surface longitudinal crack of slab.Find to adopt crystallizer electromagnetic brake technology slab cast peritectic steel surface longitudinal crack obviously will be lower than not adopt electromagnetic braking through statistics; but crystallizer bonds the warning ratio up to 20% when pulling rate surpasses 1.2m/min., 0.5 kilogram of/ton steel of the general less than of covering slag consumption.Explanation adopts the crystallizer electromagnetic brake technology can alleviate the longitudinal crack problem that the brilliant steel of slab pouring ladle occurs to a certain extent thus; the developing thought of covering slag should focus on the problem that solves high bleed-out alarm rate, to realize high peritectic steel slab casting rate.Therefore, developing the high pulling rate peritectic steel slab covering slag that adapts to the application of crystallizer electromagnetic brake technology has important practical significance.
Summary of the invention:
Purpose of the present invention provides a kind of high-casting speed mold flux, mainly solves under the electromagnetic braking condition the high technical problem of crystallizer bonding alarm rate in the high draw speed plate blank casting machine continuous casting peritectic steel process.
For realizing purpose of the present invention, technical scheme of the present invention is: a kind of high-casting speed mold flux, the percentage by weight of its constituent is: SiO 232.0～34.0%, CaO 39.0～41.0%, Al 2O 34.0～5.0%, Na 2O 7.5～9.5%, F -5.0～6.0%, MgO 2.0～3.0%, Fe 2O 30.5～1.5%, C 2.5～3.0%, Li 2O 0.7～1.0%, B 2O 30.9～1.4%.Dual alkalinity (CaO/SiO in the covering slag 2) be 1.15～1.25.
Slag of the present invention has more now embodied following characteristics with slab peritectic steel covering slag:
1) lower dual alkalinity (R=CaO/SiO 2), the crystallization ratio of the setting temperature of favourable reduction covering slag and slag film, the lubricating function of enhancing liquid slag film also improves meniscus simultaneously and conducts heat, and improves melt cinder and flows into condition, increases the covering slag consumption.Draw by the TTT curve that makes up the different basicity covering slags of 1.25-1.5, with reference to Fig. 1,2, along with the increase of basicity, the TTT curve moves to the direction that the incubation time shortens, isothermal temperature raises.Along with the raising of slag basicity, the O that CaO provides 2-Promote the silicon-oxy tetrahedron network structure to disintegrate, viscosity reduces, and makes the steric hindrance of ions diffusion migration reduce, and has promoted growing up of crystal, shortens so show as the incubation time; The covering slag liquidus temperature improves, thereby causes beginning to separate out the temperature rising of crystal.And when melt cinder membrane crystallization temperature height, when percent crystallization in massecuite is high, the crystallizer thermal resistance will be improved, casting is bad and crystallizer wall frictional force increases, and bleed-out and mass defect easily take place this moment.Therefore, obtain lubricated good strand, covering slag should adopt lower dual alkalinity.Simultaneously, according to the influence rule of basicity to heat flow density, basicity heat flow density in 0.8～1.1 scope is increase trend, when basicity greater than 1.1 the time, heat flow density begins to descend.Basicity is from the process that 0.8～1.1 changes, and the slag film thickness reduces gradually, so heat flow density increases, when basicity 1.2 the time, have pore to occur in the slag film, surface roughness is very big, therefore effectively reduces interface resistance, thereby heat flow density is descended.After this, basicity is big more, and the crystallization rate is high more, and heat flow density also descends thereupon.In conjunction with the influence rule of basicity to recrystallization temperature and heat flow density, the basicity of selecting this covering slag is between the 1.15-1.25.
2) add a certain amount of Li in the covering slag 2O also can improve the greasy property of covering slag except promoting crystallization.By Li to 0.5-3% content 2Discovering of O slag system TTT curve is with reference to Fig. 3,4,5, Li 2O content is increased to 1.5% by 0.5%, and the viscosity of sample reduces 0.08Pas, and the incubation time reduces 25s.But Li 2After O content reached 1.5%, crystal incubation time amplitude of variation was little, so continue to increase Li 2O content does not improve crystallization rate.Pass through Li again 2O discovers the influence of slag film hot-fluid, and the hot-fluid by the slag film is along with Li 2The increase of O content and increasing.According to the fusing point setting range of covering slag and the needs that promote crystallization and crystallizer hot-fluid, select Li 2O content is 0.7-1.0%.
3) add a certain amount of B in the covering slag 2O 3Also play the effect of two aspects, the one, strengthen the function that covering slag absorbs deoxidation products, also can reduce the setting temperature of covering slag simultaneously, improve the greasy property of covering slag.With reference to Fig. 6,7, research B 2O 3The CCT curve of content 0-3% slag specimen is found, along with B 2O 3Content increases, and the covering slag critical cooling rate reduces, and the crystallizing power of slag specimen weakens, the glass enhancing.B 2O 3Every increase by 1%, the covering slag fusing point reduces by 11 ℃, and the degree of superheat that is equivalent to covering slag under same cast temperature improves, thereby makes separating out of crystalline phase be suppressed, and has improved the vitrifying rate of slag, improves the greasy property of covering slag.By to B 2O 3Content is discovered B to the rule that influences of fusion temperature and viscosity 2O 3The increase of content can make viscosity coefficient of dross and fusion temperature significantly reduce.B 2O 3Add in the slag and can significantly reduce the fusion temperature of slag, and then make the flowability of slag strengthen, moreover, B 2O 3Belong to acidic oxide, the effect of its " network " organizator is than SiO 2A little less than, so its increase has just reduced SiO 2Effect.The flowability of adding slag strengthens, and the acting in conjunction of this two aspect has reduced the viscosity of slag, improves the glass of slag, and then improves the greasy property of slag.
4) C content is controlled at suitable scope in the covering slag.Carbonaceous material in the covering slag has very big influence to its molten speed, and Fig. 8 is the influence to the covering slag burn-off rate of the adding form of carbon black and graphite and addition.The carbon content that adds as seen from the figure in the slag is many more, and the fusing amount of covering slag is more little, and burn-off rate is slow more.And molten speed is to estimate the important parameter that covering slag is supplied with the melt cinder ability; Consumption is for the lubricated very valuable parameter that provides is provided.This invention is to realize high peritectic steel slab casting rate, solves the high problem of crystallizer bonding alarm rate, therefore, should guarantee that covering slag has burn-off rate and suitable slag consumption faster.Calculate according to the empirical equation of burn-off rate, slag consumption and carbon content respectively, and take all factors into consideration the influence of other carbonate, draw carbon content and be controlled between the 2.5%-3%.
Preparation method of the present invention is: raw material preparation → batching → stirring and evenly mixing → water mill pulping → mist projection granulating → finished product packing, wherein mixing stirs and each 60 minutes water mill pulping time.
Raw material of the present invention comprises melting charge, clinker, wollastonite, fluorite, sodium carbonate, lithium carbonate, sodium fluoride, borax anhydrous, bauxite, bentonite, carbon black; covering slag raw material of the present invention is except melting charge is the semi-finished product material; other are the raw material of industry, and raw material components (percentage by weight) requires as follows:
Clinker: CaO 62.0～64.0%, SiO 219.0～21.0%;
Wollastonite: CaO 45.0～46.0%, SiO 251.0～52.0%;
Fluorite: CaF 290.0～91.0%;
Sodium carbonate: Na 2CO 398.0～99.0%;
Lithium carbonate: Li 2CO 398.0～99.0%;
Borax anhydrous: Na 2O 30.0～31.0%, B 2O 367.0～69.0%;
Sodium fluoride: NaF 97.0～99.0%;
Bauxite: Al 2O 383.0～86.0%;
Bentonite: SiO 275.0～78.0%
Carbon black: C 96.0～98.0%.
Used melting charge composition is: CaO 44.0～46.0%, SiO 235.0～37.0%; Al 2O 33.0 Fe～4.0%, 2O 30.8～1.2%, MgO 2.0～3.0%, Na 2O 6.0～6.5%, F 4.0～5.0%.
The granularity of melting charge of the present invention, clinker, wollastonite, fluorite, sodium carbonate, lithium carbonate, sodium fluoride, borax anhydrous, bauxite, bentonite, carbon black is all less than 250 orders.
Beneficial effect of the present invention is: the covering slag that the present invention obtains has lower fusing point, setting temperature and viscosity.Proportion design of the present invention all is to strengthen the crystallizer meniscus to conduct heat; improve covering slag and flow into condition; carry out towards the direction that increases covering slag consumption and minimizing crystallizer wall and base shell frictional force, the more important thing is that covering slag has lower basicity, a certain amount of Li simultaneously 2O and B 2O 3The connected effect that component produced more helps improving the greasy property of covering slag, reaches realize to reduce under the electromagnetic braking condition the high purpose of crystallizer bonding alarm rate in the high draw speed plate blank casting machine continuous casting peritectic steel process.Covering slag physical property of the present invention is that fusing point (hemisphere point temperature) is 1070～1090 ℃; Setting temperature is 1110～1130 ℃ (temperature-viscosity curve judgements); 1300 ℃ viscosity is 0.07～0.09PaS.
Description of drawings:
Fig. 1 is the influence of basicity to recrystallization temperature
Fig. 2 is the influence of basicity to heat flow density
Fig. 3 is Li 2O content is to the influence of viscosity
Fig. 4 is Li 2O content is to the influence of heat flow density
Fig. 5 is Li 2O content is to the influence of fusion temperature
Fig. 6 is B 2O 3Content is to the influence of covering slag setting temperature
Fig. 7 is B 2O 3Content is to the influence of viscosity
Fig. 8 is the influence to burn-off rate of graphite and carbon black
The specific embodiment:
Embodiment 1: covering slag chemical analysis: CaO 40.3%, SiO 233.2%, li 2O 0.8%, Na 2O 8.6%, F -5.5%, B 2O 31.2%, MgO 2.5%, Al 2O 34.5%, Fe 2O 30.6%, C 2.8%.Covering slag physical property: 1083 ℃ of fusing points, 1300 ℃ viscosity 0.079PaS, 1122 ℃ of setting temperatures.
Embodiment 2: covering slag chemical analysis: CaO 39.8%, SiO 233.8%, li 2O 0.9%, Na 2O 8.3%, F -5.6%, B 2O 31.0%, MgO 2.9%, Al 2O 34.3%, Fe 2O 30.7%, C 2.7%.Covering slag physical property: 1074 ℃ of fusing points, 1300 ℃ viscosity 0.083PaS, 1116 ℃ of setting temperatures.
Embodiment 3: covering slag chemical analysis: CaO 40.6%, SiO 232.7%, li 2O O.7%, Na 2O 9.1%, F -5.2%, B 2O 3O.9%, MgO 2.5%, Al 2O 34.7%, Fe 2O 30.8%, C 2.8%.Covering slag physical property: 1086 ℃ of fusing points, 1300 ℃ viscosity 0.072PaS, 1128 ℃ of setting temperatures.
Embodiment 1～3 pours into a mould peritectic steel on slab caster, cast section 210mm * 900～1200mm, and the slag consumption when pulling rate is 1.4m/min. is 0.56kg/T steel, molten steel surface liquid slag layer thickness 9～10mm.Result of the test shows that when this covering slag used, spreadability, heat insulating ability and meltdown property showed well in crystallizer, and four face heat outputs are stable and even in the crystallizer, and the steel slab surface quality is good; The more former slag of covering slag consumption has improved 10%, and crystallizer is dialled heat has increased by 5%, and crystallizer bonding alarm rate has reduced by 50%.

Claims (3)

1. high-casting speed mold flux, the percentage by weight of its constituent is: SiO 232.0～34.0%, CaO39.0～41.0%, Al 2O 34.0～5.0%, Na 2O7.5～9.5%, F -5.0～6.0%, MgO 2.0～3.0%, Fe 2O 30.5～1.5%, C 2.5～3.0%, Li 2O 0.7～1.0%, B 2O 30.9～1.4%, dual alkalinity CaO/SiO in the covering slag 2Be 1.15～1.25.
2. a kind of high-casting speed mold flux according to claim 1 is characterized in that described covering slag becomes assignment system by melting charge, clinker, wollastonite, fluorite, sodium carbonate, lithium carbonate, sodium fluoride, borax anhydrous, bauxite, bentonite, these raw materials of carbon black by claim 1.
3. a kind of high-casting speed mold flux according to claim 2 is characterized in that the percentage by weight of described its constituent of raw material is: melting charge CaO 44.0～46.0%, SiO 235.0～37.0%; Al 2O 33.0 Fe～4.0%, 2O 30.8～1.2%, MgO 2.0～3.0%, Na 2O 6.0～6.5%, F 4.0～5.0%; Clinker: CaO 62.0～64.0%, SiO 219.0～21.0%; Wollastonite: CaO 45.0～46.0%, SiO 251.0～52.0%; Fluorite: CaF 290.0～91.0%; Sodium carbonate: Na 2CO 398.0～99.0%; Lithium carbonate: Li 2CO 398.0～99.0%; Borax anhydrous: Na 2O 30.0～31.0%, B 2O 367.0～69.0%; Sodium fluoride: NaF 97.0～99.0%; Bauxite: Al 2O 383.0～86.0%; Bentonite: SiO 275.0～78.0%; Carbon black: C 96.0～98.0%.
CN2009100279019A 2009-05-13 2009-05-13 High-casting speed mold flux Expired - Fee Related CN101885043B (en)

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CN102029366A (en) * 2010-12-14 2011-04-27 西峡龙成冶金材料有限公司 Continuous casting crystallizer covering slag special for extra-thick slab peritectic steel and preparation method thereof
CN102248141A (en) * 2011-06-27 2011-11-23 河南通宇冶材集团有限公司 High-alkalinity mould flux used for niobium/vanadium/titanium-containing low alloy wide and heavy plate blank and manufacturing method thereof
CN102764879A (en) * 2012-07-25 2012-11-07 南京钢铁股份有限公司 High-aluminum steel die casting protective slag
CN102825228A (en) * 2012-07-31 2012-12-19 马鞍山科润冶金材料有限公司 Continuous casting crystallizer covering slag for high-temperature alloy steel and method for preparing continuous casting crystallizer covering slag
CN104226947A (en) * 2013-06-17 2014-12-24 上海梅山钢铁股份有限公司 Tundish covering agent for ultra-low-carbon steel
CN104368778A (en) * 2014-11-13 2015-02-25 武汉钢铁(集团)公司 Peritectic steel covering slag containing multiple metal oxides
CN106493319A (en) * 2016-10-24 2017-03-15 唐山市鑫焱昌科技有限公司 High pulling rate continuous small-billet casting covering slag and preparation method thereof
CN106623880A (en) * 2016-12-13 2017-05-10 武汉钢铁股份有限公司 Slag melting agent for eliminating steel ladle viscous slag and eliminating method
CN108838355A (en) * 2018-07-09 2018-11-20 西峡龙成冶金材料有限公司 A kind of continuous-casting crystallizer especially used covering slag of ESP low-carbon
CN109382489A (en) * 2017-08-10 2019-02-26 上海梅山钢铁股份有限公司 A kind of carbon aluminium-killed steel crystallizer protecting residue
CN111774542A (en) * 2020-04-23 2020-10-16 华北理工大学 Super high drawing speed thin slab continuous casting covering slag for medium carbon steel
CN112355261A (en) * 2020-10-26 2021-02-12 中天钢铁集团有限公司 Crystallizer casting powder suitable for producing peritectic steel through efficient continuous casting
CN115026249A (en) * 2022-05-23 2022-09-09 首钢京唐钢铁联合有限责任公司 Covering slag for producing sheet billet high-drawing-speed low-carbon steel and preparation method thereof

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CN102029366A (en) * 2010-12-14 2011-04-27 西峡龙成冶金材料有限公司 Continuous casting crystallizer covering slag special for extra-thick slab peritectic steel and preparation method thereof
CN102029366B (en) * 2010-12-14 2012-10-03 西峡龙成冶金材料有限公司 Continuous casting crystallizer covering slag special for extra-thick slab peritectic steel and preparation method thereof
CN102248141A (en) * 2011-06-27 2011-11-23 河南通宇冶材集团有限公司 High-alkalinity mould flux used for niobium/vanadium/titanium-containing low alloy wide and heavy plate blank and manufacturing method thereof
CN102248141B (en) * 2011-06-27 2013-08-21 河南通宇冶材集团有限公司 High-alkalinity mould flux used for niobium/vanadium/titanium-containing low alloy wide and heavy plate blank and manufacturing method thereof
CN102764879A (en) * 2012-07-25 2012-11-07 南京钢铁股份有限公司 High-aluminum steel die casting protective slag
CN102825228A (en) * 2012-07-31 2012-12-19 马鞍山科润冶金材料有限公司 Continuous casting crystallizer covering slag for high-temperature alloy steel and method for preparing continuous casting crystallizer covering slag
CN104226947B (en) * 2013-06-17 2016-08-17 上海梅山钢铁股份有限公司 A kind of tundish covering flux used for ultra-low-carbon steel
CN104226947A (en) * 2013-06-17 2014-12-24 上海梅山钢铁股份有限公司 Tundish covering agent for ultra-low-carbon steel
CN104368778A (en) * 2014-11-13 2015-02-25 武汉钢铁(集团)公司 Peritectic steel covering slag containing multiple metal oxides
CN106493319A (en) * 2016-10-24 2017-03-15 唐山市鑫焱昌科技有限公司 High pulling rate continuous small-billet casting covering slag and preparation method thereof
CN106623880A (en) * 2016-12-13 2017-05-10 武汉钢铁股份有限公司 Slag melting agent for eliminating steel ladle viscous slag and eliminating method
CN106623880B (en) * 2016-12-13 2018-06-15 武汉钢铁有限公司 Remove the slagging agent and sweep-out method of ladle dry slag
CN109382489A (en) * 2017-08-10 2019-02-26 上海梅山钢铁股份有限公司 A kind of carbon aluminium-killed steel crystallizer protecting residue
CN108838355A (en) * 2018-07-09 2018-11-20 西峡龙成冶金材料有限公司 A kind of continuous-casting crystallizer especially used covering slag of ESP low-carbon
CN108838355B (en) * 2018-07-09 2020-06-02 西峡龙成冶金材料有限公司 ESP low-carbon special continuous casting crystallizer casting powder
CN111774542A (en) * 2020-04-23 2020-10-16 华北理工大学 Super high drawing speed thin slab continuous casting covering slag for medium carbon steel
CN112355261A (en) * 2020-10-26 2021-02-12 中天钢铁集团有限公司 Crystallizer casting powder suitable for producing peritectic steel through efficient continuous casting
CN115026249A (en) * 2022-05-23 2022-09-09 首钢京唐钢铁联合有限责任公司 Covering slag for producing sheet billet high-drawing-speed low-carbon steel and preparation method thereof
CN115026249B (en) * 2022-05-23 2024-02-09 首钢京唐钢铁联合有限责任公司 Covering slag for producing low-carbon steel with high pulling speed of sheet billet and preparation method thereof

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