CN103121089B - Colorful continuous casting crystallizer covering slag for ultra-low carbon steel - Google Patents
Colorful continuous casting crystallizer covering slag for ultra-low carbon steel Download PDFInfo
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- CN103121089B CN103121089B CN201310078020.6A CN201310078020A CN103121089B CN 103121089 B CN103121089 B CN 103121089B CN 201310078020 A CN201310078020 A CN 201310078020A CN 103121089 B CN103121089 B CN 103121089B
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Abstract
The invention discloses a colorful continuous casting crystallizer covering slag for ultra-low carbon steel. Materials of the colorful continuous casting crystallizer covering slag for the ultra-low carbon steel comprise fluorite powder 3% to 5%, industrial pure soda 3% to 5%, wollastonite in powder 44% to 55%, light roasting magnesite powder 5.5% to 7.5%, bauxite powder 2.5% to 4%, cryolite powder 7%, cement clinker 3.5% to 6%, lithium carbonate2%, iron oxide red 8% to 18%, a binding agent 1% to 2% and a water reducing agent 0.1% to 1%. The covering slag is good in spreadability in a crystallizer, active in surface of the slag, clear, regular and shallow in a casting blank and a vibration mark and free of the phenomena of slag adhesion and slag rolling. A surface of the casting blank is flat and smooth without abnormality. Passing rate of first products of the casting blanks is improved to over 99.9% from 86.2% in the prior art.
Description
Technical field
The present invention relates to continuous casting of iron and steel covering slag, particularly the colored continuous crystallizer protecting slag of a kind of used for ultra-low-carbon steel.
Background technology
Current, during the domestic continuous casting at mild steel especially ultra-low-carbon steel is produced, the problem the most easily occurring is exactly carburetting.This problem has become the biggest problem in continuous casting of ultralow carbon steel production.The main thought that we solved such problem is in the past exactly the free carbon content reducing as much as possible in continuous crystallizer protecting slag; introduce less carbonaceous material or without carbonaceous material as far as possible; but as long as just may there is molten steel recarburization with carbonaceous material; without carbonaceous material, cause again covering slag heat insulation effect poor; also follow problems such as occurring slag bar is large, crust, so effect is very undesirable on the whole simultaneously.US4038067 has proposed to adopt nitride that BN is representative substituting carbon material.Nitride fusing point is higher, and its lattice is similar to graphite, can be used as the framework material in covering slag, but expensive, and the spreadability of covering slag and heat insulating ability are not as carbon-containing protective slag.The carbon-less protecting slag that patent CN92106323.7 adopts large so wollastonite, lime stone, potassic feldspar, fluorite, calcined soda for industry, frog stone to form; this invention prevents that the effect of carbon pick-up in strand is obvious, but fusing point viscosity is low, and consumption is large; easy-sintering, heat insulating ability and spreadability are not good.
In covering slag, add strong reducing property metal as SiCa powder; FeMn powder etc.; thereby these materials, by preferentially reacting the oxidation that slows down carbon materials with oxygen, can reduce like this amount of allocating into of carbon materials, thereby reach the object that prevents carbon pick-up in strand in the melting process of covering slag.What for example the clear 64-66056 of open patent adopted is exactly the method that adds the strong reducing property metal powder of 0.5-5.0%.The deficiency of these class methods is: the chemism of the strong reducing property metal powder adding is larger, has special requirement in production and processing and transportation; In addition, price is also somewhat expensive.
And external early just trial several years ago used carbon-free colored covering slag in continuous casting of ultralow carbon steel is produced, the use of this covering slag not only efficiently solves continuous casting billet molten steel recarburization problem, and has guaranteed good slab quality.But use at home this kind of imported relay slag to have two large subject matters: (1) cost is higher; (2) can not be effectively in conjunction with the concrete manufacturing condition of each steel mill, design separately, specific aim is not strong.
Summary of the invention
The object of this invention is to provide the colored continuous crystallizer protecting slag of a kind of used for ultra-low-carbon steel, not only can improve the heat-insulating property of covering slag and effectively control its burn-off rate, and efficiently solving continuous casting billet molten steel recarburization problem, guaranteed good slab quality.
For realizing object of the present invention; the colored continuous crystallizer protecting slag of used for ultra-low-carbon steel, its raw material comprises Fluorspar Powder 3～5%, calcined soda for industry 3～5%, wollastonite in powder 44～55%, light burned magnesite powder 5.5～7.5%, bauxite powder 2.5～4%, cryolite powder 7%, clinker 3.5～6%, lithium carbonate 2%, iron oxide red 8～18%, adhesive 1～2%, water reducer 0.1～1%.
Preferably; the colored continuous crystallizer protecting slag of used for ultra-low-carbon steel, its raw material comprises Fluorspar Powder 3～5%, calcined soda for industry 3～5%, wollastonite in powder 44～55%, light burned magnesite powder 5.5～7.5%, bauxite powder 2.5～4%, cryolite powder 7%, clinker 3.5～6%, lithium carbonate 2%, iron oxide red 15.5～17.5%, adhesive 1～2%, water reducer 0.1～1%.
CaO:25.5%～31.5% in the colored continuous crystallizer protecting slag of described used for ultra-low-carbon steel, SiO
2: 27.5%～35.5%, F
-: 4.5%～8.5%, MgO:5%～7%, Fe
2o
3: 15.5%～17%, Al
2o
3: 2%～5%, Na
2o:6.5%～9%, MnO :≤1%, Li
2o :≤1%, dual alkalinity (CaO/SiO
2)=0.92.
Below the invention will be further described:
(1) iron oxide red is minimum particulate, and dispersibility is very strong, so can reach very large surface area, can cover the conventional raw material of all formation covering slags.A part for these colouring materials has higher fusing point, and a part has higher decomposition temperature.Therefore the oxidizing temperature of these characteristic temperatures and conventional carbon is very approaching, and the ability of colored covering slag controlled melting speed is identical with control the ability that free carbon carrys out controlled melting speed by adjusting.
(2) it is painted that iron oxide red can be given covering slag; improve the heat ray absorbent properties of covering slag; give full play to the heat insulation effect of covering slag: the macromolecular structure material that glass is comprised of polyatom; polyatomic molecule is when vibration; only have and in vibration processes, can change the symmetrical behaviour of molecule and dipole moment is changed, could absorb infra-red radiation.In vibration processes, dipole moment changes greatly, and corresponding absorption band is stronger.The electric charge of vibration particle is more, and the variation of dipole moment is larger, and INFRARED ABSORPTION is just stronger, because the impurity and the defect that exist in dipole moment and glass molecular structure are directly related, therefore can be by adding foreign ion to improve the INFRARED ABSORPTION performance of material.Due to transition-metal ion in the network structure of covering slag due to the distance with ambient oxygen ion not etc.; between them, can produce a larger dipole moment; when lattice vibration, the variation of its dipole moment will increase; they have the eigen vibration bands of a spectrum of oneself; the bands of a spectrum of these bands of a spectrum and covering slag self are superimposed, further improved the infrared radiation property of material.
(3) in covering slag, add Fe
3+the structure generation impact of the solid solution of transition metal ions in covering slag on covering slag, changes the chemical environment of the elements such as Si in covering slag, O, Al, has reduced the symmetric form of molecular structure, thereby the INFRARED ABSORPTION performance of covering slag is improved.This is due to Fe
3+ionic radius less, outermost electron is little to the shielding action of core, thereby effective nuclear chargt is larger, and part is had to stronger attraction, so they have the tendency of very strong formation complex.Due to the difference of complex break-up energy, it selects light absorbing wavelength different, so the painted difference of transiting group metal elements in glass.Add Fe
2o
3after covering slag become bronzing, this is because their absorb the light of some wavelength in visible region, to present the color of unabsorbed part light.In fact, the light absorbing scope of transiting group metal elements often expands to nearly purple light district and infrared light district, and their light absorbing scopes are roughly in the wave-length coverage of 200～25000nm, within heat ray is also comprised in this scope.
(4), due to this colour continuous crystallizer protecting slag, in raw material, do not use carbonaceous material class, thereby himself can not cause molten steel recarburization.
(5) Fe
2o
3be compound the most stable in iron oxide material, Heat stability is good, purity are high, are a kind of good catalyst.Therefore iron oxide red be added in the stability that has increased to a certain extent covering slag, effectively guaranteed the even fusing of the different basal granules of covering slag.
Compared with prior art, tool of the present invention has the following advantages: the prices of raw and semifnished materials are cheap, is convenient to promote the use of; The fusion temperature of covering slag is lower, and viscosity is larger, can form suitable slag layer thickness, has reduced again the coefficient of the carbon in molten slag layer to molten steel diffusion, not carburetting of molten steel; In covering slag, contain a certain amount of oxidant, so that the carbon in enrichment carbon-coating is fully oxidized, has reduced the possibility of enrichment carbon-coating to molten steel carburetting, and can not cause molten steel oxygenation, not carburetting of molten steel; Although carbon containing not in slag, the problems such as molten slag layer is blocked up, slag plate knot do not occur, covering slag spreadability in crystallizer is good, and the top of the slag is active; Strand, oscillation mark is clear, regular, more shallow, and without being stained with slag, slag phenomenon, casting billet surface is smooth smooth without abnormal, and strand primes qualification rate is increased to more than 99.9% by original 86.2%.
The specific embodiment
The colored continuous crystallizer protecting slag of used for ultra-low-carbon steel, its raw material comprises Fluorspar Powder 3～5%, calcined soda for industry 3～5%, wollastonite in powder 44～55%, light burned magnesite powder 5.5～7.5%, bauxite powder 2.5～4%, cryolite powder 7%, clinker 3.5～6%, lithium carbonate 2%, iron oxide red 8～18%, adhesive 1～2%, water reducer 0.1～1%.
Preferably; the colored continuous crystallizer protecting slag of used for ultra-low-carbon steel, its raw material comprises Fluorspar Powder 3～5%, calcined soda for industry 3～5%, wollastonite in powder 44～55%, light burned magnesite powder 5.5～7.5%, bauxite powder 2.5～4%, cryolite powder 7%, clinker 3.5～6%, lithium carbonate 2%, iron oxide red 15.5～17.5%, adhesive 1～2%, water reducer 0.1～1%.
CaO:25.5%～31.5% in the colored continuous crystallizer protecting slag of described used for ultra-low-carbon steel, SiO
2: 27.5%～35.5%, F
-: 4.5%～8.5%, MgO:5%～7%, Fe
2o
3: 15.5%～17%, Al
2o
3: 2%～5%, Na
2o:6.5%～9%, MnO :≤1%, Li
2o :≤1%, dual alkalinity (CaO/SiO
2)=0.92.
The colored continuous crystallizer protecting slag of used for ultra-low-carbon steel of the present invention and original covering slag (comparative example 8,9) are carried out to service test.Adopt covering slag of the present invention, can effectively prevent molten steel or carbon pick-up in strand.Specific embodiment is in Table l, and the burn-off rate of embodiment and comparative example contrasts, and obvious thawing speed of the present invention is good, good burn-off rate and the effect of iron oxide red, thus reduced the amount of allocating into of carbon in covering slag, effectively realize the production of ultra-low-carbon steel.Example and the comparative example impact on molten steel recarburization in table 1.From embodiment 1,2,3,4,5,6,7, adopt the carbon amount of technology strand of the present invention to reduce, to not carburetting of molten steel, can meet the production requirement of ultra-low-carbon steel.
As shown in Table 1; 7 embodiment provided by the invention; adopt technical formula of the present invention to add a certain amount of iron oxide red; make to add the impregnation of carbon of covering slag in the particle of base slag charge; greatly reduce the activity of carbon, delayed the oxidation rate of carbon, make carbon in covering slag effectively bring into play its controlled melting speed and effect; thereby the addition of carbon in minimizing covering slag, its final carbon pick-up in strand amount is significantly less than the carbon pick-up in strand amount of comparative example covering slag.For embodiment 7, adopt technical solution of the present invention, work as Fe
2o
3content is 17% time, and the carbon amount of strand reduces to 0.00008, and not carburetting of molten steel; Observe strand under cold conditions, oscillation mark is clear, regular, more shallow, and nothing is stained with slag, slag phenomenon, and casting billet surface is smooth smooth without abnormal, and strand primes qualification rate is increased to more than 99.9% by original 86.2%.
Table 1 embodiment covering slag and comparative example covering slag Main Ingredients and Appearance and result of use
Claims (4)
1. the colored continuous crystallizer protecting slag of a used for ultra-low-carbon steel; it is characterized in that: raw materials and percentage by weight thereof are respectively Fluorspar Powder 3～5%, calcined soda for industry 3～5%, wollastonite in powder 44～55%, light burned magnesite powder 5.5～7.5%, bauxite powder 2.5～4%, cryolite powder 7%, clinker 3.5～6%, lithium carbonate 2%, iron oxide red 8～18%, adhesive 1～2%, water reducer 0.1～1%.
2. the colored continuous crystallizer protecting slag of used for ultra-low-carbon steel as claimed in claim 1; it is characterized in that: raw materials and percentage by weight thereof are respectively Fluorspar Powder 3～5%, calcined soda for industry 3～5%, wollastonite in powder 44～55%, light burned magnesite powder 5.5～7.5%, bauxite powder 2.5～4%, cryolite powder 7%, clinker 3.5～6%, lithium carbonate 2%, iron oxide red 15.5～17.5%, adhesive 1～2%, water reducer 0.1～1%.
3. the colored continuous crystallizer protecting slag of used for ultra-low-carbon steel as claimed in claim 1, is characterized in that: its chemical composition and percentage by weight are respectively: CaO:25.5%～31.5%, SiO
2: 27.5%～35.5%, F
-: 4.5%～8.5%, MgO:5%～7%, Fe
2o
3: 15.5%～17%, Al
2o
3: 2%～5%, Na
2o:6.5%～9%, MnO :≤1%, Li
2o :≤1%, dual alkalinity (CaO/SiO
2)=0.92.
4. the colored continuous crystallizer protecting slag of used for ultra-low-carbon steel as claimed in claim 3, is characterized in that: Fe in described covering slag
2o
3percentage by weight is 17%, does not add any carbonaceous material.
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| CN104511580B (en) * | 2013-09-30 | 2016-09-14 | 上海梅山钢铁股份有限公司 | A kind of mild steel molten steel flux |
| CN103817301B (en) * | 2014-02-27 | 2016-01-27 | 西峡龙成冶金材料有限公司 | A kind of continuous crystallizer protecting slag for ultra-low-carbon steel |
Citations (5)
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|---|---|---|---|---|
| CN1270862A (en) * | 2000-04-30 | 2000-10-25 | 钢铁研究总院 | Protective scoria for continuous casting of ultralow carbon steel |
| CN1485168A (en) * | 2002-09-29 | 2004-03-31 | 宝山钢铁股份有限公司 | Protective slag for continuous super low carbon steel casting |
| CN1824429A (en) * | 2005-02-25 | 2006-08-30 | 宝钢集团上海梅山有限公司 | High draw speed plate blank continuous casting low carbon steel crystallizer protective slag |
| CN101637808A (en) * | 2009-08-11 | 2010-02-03 | 河南省西保冶材集团有限公司 | ASP medium thickness slab high drawing speed plate blank low-carbon steel continuous casting functional protective material |
| CN101773996A (en) * | 2010-01-21 | 2010-07-14 | 山西太钢不锈钢股份有限公司 | Continuous casting crystallizer covering slag for non-interstitial atom steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100436506B1 (en) * | 1997-04-30 | 2004-08-18 | 주식회사 포스코 | Ladle heat-insulating material for ultra-low carbon special molten steel, excellent in heat keeping ability, alumina absorptivity, and corrosion-resistance to magnesia refractory |
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2013
- 2013-03-12 CN CN201310078020.6A patent/CN103121089B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1270862A (en) * | 2000-04-30 | 2000-10-25 | 钢铁研究总院 | Protective scoria for continuous casting of ultralow carbon steel |
| CN1485168A (en) * | 2002-09-29 | 2004-03-31 | 宝山钢铁股份有限公司 | Protective slag for continuous super low carbon steel casting |
| CN1824429A (en) * | 2005-02-25 | 2006-08-30 | 宝钢集团上海梅山有限公司 | High draw speed plate blank continuous casting low carbon steel crystallizer protective slag |
| CN101637808A (en) * | 2009-08-11 | 2010-02-03 | 河南省西保冶材集团有限公司 | ASP medium thickness slab high drawing speed plate blank low-carbon steel continuous casting functional protective material |
| CN101773996A (en) * | 2010-01-21 | 2010-07-14 | 山西太钢不锈钢股份有限公司 | Continuous casting crystallizer covering slag for non-interstitial atom steel |
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