CN101637810A - SMS, Danieli plate blank medium carbon steel continuous casting functional protective material - Google Patents
SMS, Danieli plate blank medium carbon steel continuous casting functional protective material Download PDFInfo
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- CN101637810A CN101637810A CN200910065729A CN200910065729A CN101637810A CN 101637810 A CN101637810 A CN 101637810A CN 200910065729 A CN200910065729 A CN 200910065729A CN 200910065729 A CN200910065729 A CN 200910065729A CN 101637810 A CN101637810 A CN 101637810A
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- slag
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Abstract
The invention discloses an SMS, Danieli plate blank medium carbon steel continuous casting functional protective material which comprises raw materials by weight percent: 1.0% of sodium carbonate, 14.0% of fluorite, 4.0% of bauxite, 33.0% of wollastonite, 2.0% of carburant, 4.5% of carbon black, 3.0% of calcite, 4.0% of barium carbonate, 4.0% of sodium fluoride, 27.5% of phosphorous slag and 3.0%of bentonite; and the protective slag hemispherical fusion temperature is 1160-1220 DEG C, and the viscosity is 0.115-0.135 Pa. S(1300 DEG C). The protective slag has good spreadability, heat preservation and melting property in a crystallizer; the four sides inside the crystallizer are stable and even in capacity of heat transmission; the thickness of the liquid slag layer is 8-12mm; furthermore,the protective material has fewer slag strips, good lubricating property of the protective slag, prevents the breakout by sticking, and has no slag inclusion and sticky residue on the surface of casting blank as well as good casting blank surface quality.
Description
Technical field
The invention belongs to the metallurgic auxiliary materials technical field, particularly a kind of SMS, Danieli slab medium carbon steel continuous casting functional protective material.
Background technology
Along with progress of science and technology, continuous casting technology progressively moves to maturity.Yet because steel-smelting technology is constantly perfect, steel-making rhythm is accelerated, and the stove tap increases, and compares with follow-up steel rolling ability with steel-making, and the production capacity of conticaster remains the restricted link in the whole steel manufacture process.For this reason, in the last few years, iron and steel enterprise generally adopted high-efficient continuous casting technology both at home and abroad.Therefore sheet billet continuous casting at home and abroad more and more comes into one's own.But the realization of slab continuous casting technology has brought many new difficult problems to continuous casting process; because the slab section is bigger; to the function protective material performance requirement than higher; the performance imperfection of function protective material; will cause between crystallizer wall and the solidified shell lubricated insufficient, conduct heat inhomogeneous; and then cause the casting billet surface defective, even sticker type breakout takes place, especially pour into a mould period in unstable state.And because different casting machine shapes are different with parameter, so be necessary different function protective materials according to different casting machine exploitations.
Four steel-making that the horse steel is newly-built, casting machine place of production SMS, cast section: 250 * 1850～2050mm2.Collateral security stove machine coupling and output require to set out, and require this conventional slab caster work pulling rate to be up to 2.0m/min, and generally pulling rate is more advanced in the conventional slab caster of should this conventional slab caster pulling rate having gone into operation at home between 1.0～1.1m/min..Because this casting machine length of mould is shorter, in order to guarantee shell thickness, so continuous casting cooling aspect cooling water inflow is stronger.The strong cold hidden danger of casting billet surface defective that just causes is bigger, is easy to generate face crack.Therefore improving the recrystallization temperature of function protective material, is the effective means that solves the casting billet surface defective.In order to realize the optimum operation performance and to obtain satisfied product quality, function protective material is had higher requirement: 1) slagging speed is fast, can in time replenish the quick consumption of melt cinder,, still can keep enough function protective material consumptions in pulling rate variation situation greatly; 2) the slag film thickness between crystallizer wall and base shell suits, is evenly distributed, and prevents that the base shell from directly contacting with crystallizer wall, to reduce frictional force and to make crystallizer heat radiation homogenising, prevents the generation and the bonding steel leakage of crackle, avoids strand to produce blemish; 3) enough slag layer thickness, when preventing high-speed continuous casting or pulling rate than great fluctuation process, the under-supply and solid slag particle of slag flows into; 4) stable operating characteristics has good absorption molten steel come-up field trash function, and makes the melt cinder rerum natura stable; 5) function protective material has stable melting characteristic and control heat energy power when pulling rate changes greatly.
Summary of the invention
The invention provides a kind of SMS, Danieli slab medium carbon steel continuous casting functional protective material that can solve sticker type breakout, casting billet surface slag inclusion and dry slag problem effectively.
A kind of SMS, Danieli slab medium carbon steel continuous casting functional protective material, the raw material of this function protective material comprises sodium carbonate, fluorite, bauxite, wollastonite, carburant, carbon black, calcite, brium carbonate, sodium fluoride, phosphorus slag, bentonite, its weight percentage is respectively 1.0%, 14.0%, 4.0%, 33.0%, 2.0%, 4.5%, 3.0%, 4.0%, 4.0%, 27.5%, 3.0%, and described function protective material hemispherical fusion temperature is 1160～1220 ℃; Viscosity is 0.115～0.135PaS (1300 ℃).
The BaO weight percentage is 2.0～2.5% in the described function protective material, and the MgO weight percentage is 3.0～4.0%, Fe
2O
3Weight percentage is 0.3～1.5%, dual alkalinity (CaO/SiO
2) be 1.24～1.34, free carbon percentage composition 5.5%～6.5%, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, its quality percentage composition is respectively SiO
226.5～32.5%, CaO 35.0～41.0%, Al
2O
33.5 Na～5.5%,
2O3.5～4.5%, F
-6.8 k～7.8%,
2O＜0.5%.
The design of function protective material physical and chemical composition:
For guaranteeing higher recrystallization temperature, at first require the dual alkalinity (CaO/SiO of function protective material
2) and hemispherical fusion temperature want high, general dual alkalinity is greater than 1.20, hemispherical fusion temperature is greater than 1150 ℃, the present invention controls the dual alkalinity of function protective material in 1.24～1.34 scopes, hemispherical fusion temperature is controlled at 1160～1220 ℃.Secondly; higher viscosity; shape and parameter at SMS, Danieli conticaster; for the assurance function protective material forms uniform and stable slag film; avoid the phenomenon of bonding steel leakage to take place; the viscosity of function protective material is difficult for too low, and this function protective material viscosity is at 0.115～0.135PaS (1300 ℃).An amount of BaO, BaO can improve the comprehensive basicity of function protective material, further improve recrystallization temperature, avoid the generation of casting billet surface lobe, BaO can also improve the greasy property of function protective material simultaneously, especially to the function protective material particularly suitable of high basicity, BaO content control range is 2.0～2.5% in the function protective material of the present invention; A certain amount of MgO can improve the stability of function protective material, and MgO content control range is 3.0～4.0% in the function protective material of the present invention; Na as conventional func protective material flux important component
2Content can not be too high in function protective material of the present invention for O, avoids separating out nepheline in the slag film on the one hand, destroys the glass properties of slag film, reduces the Na in the function protective material
2O content also can improve the surface tension of function protective material simultaneously, helps slag-Jin and separates, and reduces casting billet surface slag inclusion and dry slag, Na in the function protective material of the present invention
2O content control range is 3.5～4.5%; It is to reduce slag viscosity that F-in the function protective material mainly acts on, and improves the melt cinder flowability, but will pay special attention to control the F-content in the function protective material in the present invention, if CaF in the slag
2Too high levels can cause cuspidine (3CaO.2SiO
2.CaF
2) wait separating out of high-melting-point thing, destroy the glass of slag, lubricating condition is worsened, in addition F
-Ion concentration is too high also can to cause serious erosion to stretching into the formula mouth of a river, reduces mouth of a river service life, and for this reason, F-content control range is 6.8～7.8% in the function protective material of the present invention.At last, require function protective material to melt fast exactly, form enough liquid slag layers and guarantee certain slag consumption.The requirement mixed carbon comtent can not be too high, but can not be low excessively, otherwise the liquid slag layer and the sinter layer that form are too thick, make that the slagging scorification bar is serious, hinders the even inflow of function protective material.Therefore, join the carbon kind and select the big and fast carbon black of burning velocity of specific area for use, added a certain amount of oxidant simultaneously,, accelerate the scaling loss of carbonaceous material, reduce sinter layer thickness as iron mud.C content control range is 5.5～6.5% in the function protective material of the present invention, Fe
2O
3The content control range is 0.3～1.5%.
Adopt above-mentioned result of study to protect this function protective material that smelting material Group Co.,Ltd produces, at Ma Gangsi steel-making 250 * 1850～2050mm by the west, Henan Province
2Examination cast medium carbon steel on the slab caster, the slag consumption when pulling rate is stabilized in 1.1m/min. is 0.46kg/T steel, molten steel surface liquid slag layer thickness 8～12mm.Show that through site test results when this function protective material used, spreadability, heat insulating ability and meltdown property performance were good in crystallizer; Four face heat outputs are stable and even in the crystallizer, satisfy high pulling rate requirement; Test slag slag bar is little, improved the inflow uneven phenomenon, and the function protective material lubricity is good, has prevented sticker type breakout.Casting billet surface does not have slag inclusion and dry slag phenomenon, and cc billet surface quality is good.
The specific embodiment
Below the invention will be further described:
A kind of SMS, Danieli slab medium carbon steel continuous casting functional protective material, the raw material of this function protective material comprises sodium carbonate, fluorite, bauxite, wollastonite, carburant, carbon black, calcite, brium carbonate, sodium fluoride, phosphorus slag, bentonite, its weight percentage is respectively 1.0%, 14.0%, 4.0%, 33.0%, 2.0%, 4.5%, 3.0%, 4.0%, 4.0%, 27.5%, 3.0%, and described function protective material hemispherical fusion temperature is 1160～1220 ℃; Viscosity is 0.115～0.135PaS (1300 ℃).
The BaO weight percentage is 2.0～2.5% in the described function protective material, and the MgO weight percentage is 3.0～4.0%, Fe
2O
3Weight percentage is 0.3～1.5%, dual alkalinity (CaO/SiO
2) be 1.24～1.34, free carbon percentage composition 5.5%～6.5%, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, its quality percentage composition is respectively SiO
226.5～32.5%, CaO 35.0～41.0%, Al
2O
33.5 Na～5.5%,
2O 3.5～4.5%, F
-6.8 k～7.8%,
2O＜0.5%.
Join selecting for use of slag base-material:
The performance of function protective material depends on the selection of system slag base-material, and this research is selected to join the slag base-material with phosphorus slag mixing wollastonite as function protective material, and purpose is to make function protective material simple in structure, has more stable ore deposit phase.
Production technology and quality control standard:
The physicochemical property stability of function protective material finished product is directly related with use production technology and control criterion.In order to adapt to the high-quality demand of high draw speed plate blank function protective material, function protective material of the present invention has adopted following quality control standard: 1) every kind of raw material granularity requires by 320 orders; 2) mixing stirs and each 1 hour water mill pulping time.
Claims (2)
1. a SMS, Danieli slab medium carbon steel continuous casting functional protective material, it is characterized in that: the raw material of this function protective material comprises sodium carbonate, fluorite, bauxite, wollastonite, carburant, carbon black, calcite, brium carbonate, sodium fluoride, phosphorus slag, bentonite, its weight percentage is respectively 1.0%, 14.0%, 4.0%, 33.0%, 2.0%, 4.5%, 3.0%, 4.0%, 4.0%, 27.5%, 3.0%, and described function protective material hemispherical fusion temperature is 1160～1220 ℃; Viscosity is 0.115～0.135PaS (1300 ℃).
2. continuous casting functional protective material as claimed in claim 1 is characterized in that: the BaO weight percentage is 2.0～2.5% in the described function protective material, and the MgO weight percentage is 3.0～4.0%, Fe
2O
3Weight percentage is 0.3～1.5%, dual alkalinity (CaO/SiO
2) be 1.24～1.34, free carbon percentage composition 5.5%～6.5%, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, its quality percentage composition is respectively SiO
226.5～32.5%, CaO 35.0～41.0%, Al
2O
33.5 Na～5.5%,
2O 3.5～4.5%, F
-6.8 k～7.8%,
2O＜0.5%.
Priority Applications (1)
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|---|---|---|---|
| CN2009100657296A CN101637810B (en) | 2009-08-11 | 2009-08-11 | SMS, Danieli plate blank medium carbon steel continuous casting functional protective material |
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|---|---|---|---|
| CN2009100657296A CN101637810B (en) | 2009-08-11 | 2009-08-11 | SMS, Danieli plate blank medium carbon steel continuous casting functional protective material |
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|---|---|
| CN101637810A true CN101637810A (en) | 2010-02-03 |
| CN101637810B CN101637810B (en) | 2012-06-06 |
Family
ID=41613096
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Cited By (8)
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| CN101817065A (en) * | 2010-04-28 | 2010-09-01 | 河南省西保冶材集团有限公司 | Function protecting material of large plate blank high-carbon steel continuous casting crystallizer |
| CN101837436A (en) * | 2010-04-07 | 2010-09-22 | 河南省西保冶材集团有限公司 | Function protecting material for special ASP ultra-low carbon continuous casting crystallizer |
| CN102009142A (en) * | 2010-08-09 | 2011-04-13 | 河南省西保冶材集团有限公司 | 30MnSi steel special continuous casting crystallizer functional protection material |
| CN102019380A (en) * | 2010-08-09 | 2011-04-20 | 河南省西保冶材集团有限公司 | Continuous casting crystallizer functional protection material special for wheel steel |
| 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 |
| CN102825231A (en) * | 2012-07-31 | 2012-12-19 | 马鞍山科润冶金材料有限公司 | Crystallizer covering slag for continuously casting hot rolled steel and manufacturing method of crystallizer covering slag |
| CN104923754A (en) * | 2015-06-26 | 2015-09-23 | 唐山钢铁集团有限责任公司 | High-drawing-speed sheet billet peritectic steel continuous casting crystallizer casting powder and preparation method thereof |
| 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 |
Family Cites Families (5)
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| FR2347129A1 (en) * | 1976-04-05 | 1977-11-04 | Siderurgie Fse Inst Rech | COVERING POWDER FOR CONTINUOUS CASTING |
| CN1954939A (en) * | 2005-10-25 | 2007-05-02 | 上海众怡冶金辅料有限公司 | Wide thickness plate continuous casting crystallizer protection slag for medium carbon steel and its manufacturing method |
| CN101468388B (en) * | 2007-12-27 | 2011-01-26 | 攀钢集团攀枝花钢铁研究院 | Continuous casting mould fluxes and preparation method thereof |
| CN100584487C (en) * | 2008-01-08 | 2010-01-27 | 河南通宇冶材集团有限公司 | Preparation Preliminary melting type continuous casting crystallizer protecting slag |
| CN100566887C (en) * | 2008-02-22 | 2009-12-09 | 马鞍山钢铁股份有限公司 | The crystallizer protecting residue of special-shaped continuous casting containing manganses low-alloy high strength steel |
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| CN101837436B (en) * | 2010-04-07 | 2013-06-26 | 河南省西保冶材集团有限公司 | Function protecting material for special ASP ultra-low carbon continuous casting crystallizer |
| CN101817065B (en) * | 2010-04-28 | 2013-01-09 | 河南省西保冶材集团有限公司 | Function protecting material of large plate blank high-carbon steel continuous casting crystallizer |
| CN101817065A (en) * | 2010-04-28 | 2010-09-01 | 河南省西保冶材集团有限公司 | Function protecting material of large plate blank high-carbon steel continuous casting crystallizer |
| CN102019380A (en) * | 2010-08-09 | 2011-04-20 | 河南省西保冶材集团有限公司 | Continuous casting crystallizer functional protection material special for wheel steel |
| CN102009142B (en) * | 2010-08-09 | 2012-10-03 | 河南省西保冶材集团有限公司 | 30MnSi steel special continuous casting crystallizer functional protection material |
| CN102019380B (en) * | 2010-08-09 | 2012-10-03 | 河南省西保冶材集团有限公司 | Continuous casting crystallizer functional protection material special for wheel steel |
| CN102009142A (en) * | 2010-08-09 | 2011-04-13 | 河南省西保冶材集团有限公司 | 30MnSi steel special continuous casting crystallizer functional protection material |
| 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 |
| 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 |
| CN102825231A (en) * | 2012-07-31 | 2012-12-19 | 马鞍山科润冶金材料有限公司 | Crystallizer covering slag for continuously casting hot rolled steel and manufacturing method of crystallizer covering slag |
| CN104923754A (en) * | 2015-06-26 | 2015-09-23 | 唐山钢铁集团有限责任公司 | High-drawing-speed sheet billet peritectic steel continuous casting crystallizer casting powder and preparation method thereof |
| CN104923754B (en) * | 2015-06-26 | 2017-03-01 | 唐山钢铁集团有限责任公司 | High pulling rate sheet billet peritectic steel continuous crystallizer protecting slag and preparation method thereof |
| 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 |
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