CN103785802A - Special functional protection materials of continuous casting crystallizer and for wide and thick plate ship plate steel - Google Patents
Special functional protection materials of continuous casting crystallizer and for wide and thick plate ship plate steel Download PDFInfo
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- CN103785802A CN103785802A CN201010247669.2A CN201010247669A CN103785802A CN 103785802 A CN103785802 A CN 103785802A CN 201010247669 A CN201010247669 A CN 201010247669A CN 103785802 A CN103785802 A CN 103785802A
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- protective material
- cao
- sio
- function protective
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Abstract
The invention discloses special functional protection materials of a continuous casting crystallizer and for wide and thick plate ship plate steel. The special functional protection materials comprise, by weight, 22.0% of melting materials, 29.5% of Jilin wollastonite, 9.0% of sodium carbonate, 9.0% of fluorite, 3.0% of cryolite, 1.0% of lithium carbonate, 3.0% of carbon black, 5.0% of sodium fluoride, 4.0% of manganese dioxide, 6.0% of cement clinker, 3.5% of bauxite powder and 5.0% of barium carbonate. The functional protection materials are good in spreadability, heat preservation and melting performance in the crystallizer; four surfaces located in the crystallizer are stable and uniform in heat transfer capacity; the thickness of a liquid slag layer is 8 to 12 mm and slag strips are less; the functional protection materials are good in lubricity, the bonding steel leakage is prevented, the surfaces of casting blanks are free of longitudinal crack, and the quality of the surfaces of the casting blanks is good.
Description
Technical field
The invention belongs to steel-making metallurgical auxiliary, particularly the continuous-casting crystallizer especially used function protective material of a kind of generous ship steel.
Background technology
Wide and Thick Slab ship steel is mainly for shipping industry, Power of Chinese Shipbuilding Industry originates in 20 century 70s, through the development of 40 years, Chinese shipbuilding industry has successfully realized by the strategy of switching from manufacturing military products to goods for civilian use and having shifted greatly, actively absorb international advanced technology, China has become in the world the third-largest shipbuilding state after Japan and Korea S. at present.Shipbuilding plate is the major products in Wugang Wide and Thick Slab flanker, and the ship steel kind that Wugang is produced has A, B, D, the E common intensity level deck of boat, and the manufacturing enterprise of high strength steel plate for ship building.It is (300～330) mm × (1800～2400) mm that Wugang two is made steel 2# machine casting section, collateral security stove machine coupling and output require to set out, require this casting machine work pulling rate to be up to 0.9m/min, general pulling rate is between 0.6～0.8m/min.Along with the increase of section and the raising of pulling rate.In order to obtain satisfied product quality, therefore to the requirement of function protective material performance also very strict, function protective material lubricates guaranteeing, improves and slows down heat transfer, and the field trash in absorption molten steel, guarantees slab quality.Must guarantee to accomplish following some:
1) stable liquid slag layer thickness, the size of liquid slag layer thickness, can affect the defects such as casting billet surface cracks.
2) avoid slag circle to generate, slag circle affects the uniformity that slag film imports, and the passage that also melt cinder can be flowed downward blocks, and affects semifinished product Homogeneouslly-radiating, and lobe easily appears in surface.
3) good spreadability and gas permeability, makes the formation three-decker that bits can be very fast in crystallizer, guarantees the uniformity of the inflow of slag film.
4) suitable slag consumption, fully fills the gap between semifinished product and crystallizer, and reaches desirable slag film thickness, carrys out the convection heat transfer' heat-transfer by convection between slow semifinished product and crystallizer.
5) lower viscosity coefficient of dross, due to the shrinkage character of ship steel, causes semifinished product in the process of solidification shrinkage, and the air gap forming between crystallizer, and the air gap forming than general peritectic steel is large.Corresponding heat is transmitted also just fast, must flow into uniformly between gap by melt cinder film like this, forms good heat insulating belt, affects semifinished product and slowly conducts heat, and avoids too fast heat conduction, occurs lobe.
Summary of the invention
The object of the invention is to propose a kind of novel Wide and Thick Slab ship steel special function protective material, solve casting billet surface lobe phenomenon, the continuous-casting crystallizer especially used function protective material of a kind of Wide and Thick Slab ship steel of special development.
The continuous-casting crystallizer especially used function protective material of a kind of Wide and Thick Slab ship steel; comprise melting charge, Jilin wollastonite, sodium carbonate, fluorite, ice crystal, lithium carbonate, carbon black, sodium fluoride, manganese dioxide, clinker, bauxite powder, brium carbonate; its weight percentage is respectively 22.0%, 29.5%, 9.0%, 9.0%, 3.0%, 1.0%, 3.0%, 5.0%, 4.0%, 6.0%, 3.5%, 5.0%, and composition and the percentage by weight of described melting charge consist of: SiO
242～45%, CaO 36～39%, MgO 1.5～3.5%, Fe
2o
3be not more than 1%, Al
2o
34～6%, Na
2o 5～7%, F
-2～4%.
In described function protective material, Li
2o weight percentage is that 0.2～0.6%, MgO weight percentage is 1.0～3.0%, dual alkalinity (CaO/SiO
2) be 1.0～1.2, all the other are SiO
2, CaO, Al
2o
3, Na
2o, F
-, k
2o, MnO, C, its percentage composition is SiO
225.0～32.0%, CaO 28.0～35.0%, Al
2o
33.0～7.0%, Na
2o 7.5～11.5%, F
-6.0～8.0%, k
2o < 1.5%, MnO 2.0～3.0%, C 2.5～4.5%.
In described function protective material, Li
2o weight percentage is that 0.4%, MgO weight percentage is 2.0%, dual alkalinity (CaO/SiO
2) be 1.11, all the other are SiO
2, CaO, Al
2o
3, Na
2o, F
-, k
2o, MnO, C, its percentage composition is SiO
228.5%, CaO 31.5%, Al
2o
35.0%, Na
2o 9.5%, F
-7.0%, k
2o 0.7%, MnO 2.5%, C 3.5%.
The invention will be further described below:
In Wide and Thick Slab ship steel, alloy content is higher, is prone to the problem such as longitudinal crack and bonding, bleed-out in the time that continuous casting is produced, therefore function protective material used focus on lubricate.
The design of function protective material chemical analysis.First require the dual alkalinity (CaO/SiO of function protective material
2) can not be too high; generally to be controlled between 1.0～1.2; to guarantee that in crystallizer, slag film forms a certain proportion of glassy state, when good heat transfer, improve lubricating between base shell and crystallizer, the dual alkalinity of control function protective material of the present invention is in 1.0～1.2 scopes.Secondly, adopt method regulatory function protective material fusing point and wherein MnO, BaO and the Li of viscosity of multiple flux
2o is an important flux, to improving the greasy property of function protective material and delaying the effect highly significant conducting heat.In the present invention, MnO content 2.0～3.0% can improve heat transfer, slows down strand and produces lobe, makes the performance of function protective material more stable; Li in the present invention
2o is a kind of strong flux, Li
2the trace of O adds (0.2～0.6%) to be greatly improved to the vitrifying degree of function protective material, can make crystallization rate reduce, and can obtain low melting point, low viscosity, function protective material that glass is good; As the Na of conventional func protective material flux important component
2the effect of O in function protective material of the present invention, except reducing fusing point and viscosity, also can make it have the tendency of slag crystallization, and addition is too high, easily separates out the high-melting-point things such as nepheline, therefore Na in the present invention in slag
2the content control of O is 7.5～11.5%; F in function protective material
-main Function be to reduce slag viscosity, improve slag flow, but in the present invention will pay special attention to control function protective material F
-content, if the CaF in slag
2too high levels can cause that the high-melting-point things such as cuspidine separate out, and destroys the glass of slag, and lubricating condition is worsened, F ion concentration is too high in addition also can cause Eroded to submersed nozzle, flow field, the mouth of a river is changed, cause liquid fluctuating large, therefore the content of F-is 6.0～8.0%; Finally, require exactly function protective material rapid melting, form enough liquid slag layers and guarantee certain slag consumption.Requirement mixed carbon comtent can not be too high, but can not be too low, otherwise the liquid slag layer and the sinter layer that form are too thick, make slagging scorification bar serious, hinders the even inflow of function protective material.Therefore, join carbon kind and select specific area greatly and the fast carbon black of burning velocity.In function protective material of the present invention, C content control range is 2.5～4.5%.
Function protective material physical property is determined.The present invention requires function protective material have lower fusing point, viscosity and melt faster speed.Requirement is specifically set is: fusing point (hemisphere point temperature) is 1060-1100 ℃; The viscosity of 1300 ℃ is 0.090～0.10Pa.S.
The performance of function protective material depends on the selection of slag base-material processed, and the mixed slag of conventional machine mainly adopts multiple raw material to mix.It is that function protective material is joined slag base-material with wollastonite that this research is selected, and the conventional composition that this material contains is: SiO
2, CaO, MgO, Al
2o
3, compared with the pre-melt of routine containing Na
2o, F
-, effectively controlled Na in slag
2o, F-content, obtain and have suitable glass and crystal property slag film, guarantees lubricating between strand and crystallizer, and the stability of Slag Properties is improved, and obviously increased the stability of result of use.
Production technology and quality control standard.The physicochemical property stability of function protective material finished product and directly related when the production technology that uses and control criterion.In order to adapt to the high-quality requirement of Wide and Thick Slab ship steel function protective material, function protective material of the present invention has adopted following quality control standard: 1) every kind of raw material granularity requires to pass through-320 orders; 2) slurrying concentration be 58～62%; 3) even batch mixing, adds binding agent, water, and the defibrination time is 1 hour, and hollow granularity is+80 > 95%.
This function protective material that adopts above-mentioned result of study to produce, at Wugang 2# machine width slab conticaster upper ship steel, the slag consumption of pulling rate in the time of 0.6-0.8m/min. is 0.55kg/T steel, molten steel surface liquid slag layer thickness 10～12mm.Show through site test results, when this function protective material uses, in crystallizer, spreadability, heat insulating ability and meltdown property performance are good; In crystallizer, heat output is stable and even, meets the pulling rate requirement in fluctuation range; Test slag slag bar is little, improved inflow uneven phenomenon, and function protective material lubricity is good, has prevented sticker type breakout.Casting billet surface does not have crackle, slag inclusion and dry slag phenomenon, and cc billet surface quality is good.
The specific embodiment
Embodiment mono-
The continuous-casting crystallizer especially used function protective material of a kind of Wide and Thick Slab ship steel; comprise melting charge, Jilin wollastonite, sodium carbonate, fluorite, ice crystal, lithium carbonate, carbon black, sodium fluoride, manganese dioxide, clinker, bauxite powder, brium carbonate; its weight percentage is respectively 22.0%, 29.5%, 9.0%, 9.0%, 3.0%, 1.0%, 3.0%, 5.0%, 4.0%, 6.0%, 3.5%, 5.0%, and composition and the percentage by weight of described melting charge consist of: SiO
242～45%, CaO 36～39%, MgO 1.5～3.5%, Fe
2o
3be not more than 1%, Al
2o
34～6%, Na
2o 5～7%, F
-2～4%.
In described function protective material, Li
2o weight percentage is that 0.2%, MgO weight percentage is 3.0%, dual alkalinity (CaO/SiO
2) be 1.12, all the other are SiO
2, CaO, Al
2o
3, Na
2o, F
-, k
2o, MnO, C, its percentage composition is SiO
226.0%, CaO 29.0%, Al
2o
36.5%, Na
2o 8.5%, F
-6.2%, k
2o 1.3%, MnO 3.0%, C 2.6%.
Embodiment bis-
The continuous-casting crystallizer especially used function protective material of a kind of Wide and Thick Slab ship steel; comprise melting charge, Jilin wollastonite, sodium carbonate, fluorite, ice crystal, lithium carbonate, carbon black, sodium fluoride, manganese dioxide, clinker, bauxite powder, brium carbonate; its weight percentage is respectively 22.0%, 29.5%, 9.0%, 9.0%, 3.0%, 1.0%, 3.0%, 5.0%, 4.0%, 6.0%, 3.5%, 5.0%, and composition and the percentage by weight of described melting charge consist of: SiO
242～45%, CaO 36～39%, MgO 1.5～3.5%, Fe
2o
3be not more than 1%, Al
2o
34～6%, Na
2o 5～7%, F
-2～4%.
In described function protective material, Li
2o weight percentage is that 0.2～0.6%, MgO weight percentage is 1.0～3.0%, dual alkalinity (CaO/SiO
2) be 1.11, all the other are SiO
2, CaO, Al
2o
3, Na
2o, F
-, k
2o, MnO, C, its percentage composition is SiO
231.0%, CaO 33.0%, Al
2o
36.0%, Na
2o 10.5%, F
-7.7%, k
2o 0.4%, MnO 2.2%, C 4.2%.
Embodiment tri-
The continuous-casting crystallizer especially used function protective material of a kind of Wide and Thick Slab ship steel; comprise melting charge, Jilin wollastonite, sodium carbonate, fluorite, ice crystal, lithium carbonate, carbon black, sodium fluoride, manganese dioxide, clinker, bauxite powder, brium carbonate; its weight percentage is respectively 22.0%, 29.5%, 9.0%, 9.0%, 3.0%, 1.0%, 3.0%, 5.0%, 4.0%, 6.0%, 3.5%, 5.0%, and composition and the percentage by weight of described melting charge consist of: SiO
242～45%, CaO 36～39%, MgO 1.5～3.5%, Fe
2o
3be not more than 1%, Al
2o
34～6%, Na
2o 5～7%, F
-2～4%.
In described function protective material, Li
2o weight percentage is that 0.4%, MgO weight percentage is 2.0%, dual alkalinity (CaO/SiO
2) be 1.11, all the other are SiO
2, CaO, Al
2o
3, Na
2o, F
-, k
2o, MnO, C, its percentage composition is SiO
228.5%, CaO 31.5%, Al
2o
35.0%, Na
2o 9.5%, F
-7.0%, k
2o 0.7%, MnO 2.5%, C 3.5%.
Claims (3)
1. the continuous-casting crystallizer especially used function protective material of Wide and Thick Slab ship steel; it is characterized in that: its raw material comprises melting charge, Jilin wollastonite, sodium carbonate, fluorite, ice crystal, lithium carbonate, carbon black, sodium fluoride, manganese dioxide, clinker, bauxite powder, brium carbonate; its weight percentage is respectively 22.0%, 29.5%, 9.0%, 9.0%, 3.0%, 1.0%, 3.0%, 5.0%, 4.0%, 6.0%, 3.5%, 5.0%, and composition and the percentage by weight of described melting charge consist of: SiO
242～45%, CaO 36～39%, MgO 1.5～3.5%, Fe
2o
3be not more than 1%, Al
2o
34～6%, Na
2o 5～7%, F
-2～4%.
2. the continuous-casting crystallizer especially used function protective material of Wide and Thick Slab ship steel as claimed in claim 1, is characterized in that: in described function protective material, and Li
2o weight percentage is that 0.2～0.6%, MgO weight percentage is 1.0～3.0%, dual alkalinity (CaO/SiO
2) be 1.0～1.2, all the other are SiO
2, CaO, Al
2o
3, Na
2o, F
-, k
2o, MnO, C, its percentage composition is SiO
225.0～32.0%, CaO 28.0～35.0%, Al
2o
33.0～7.0%, Na
2o 7.5～11.5%, F
-6.0～8.0%, k
2o < 1.5%, MnO 2.0～3.0%, C 2.5～4.5%.
3. the continuous-casting crystallizer especially used function protective material of Wide and Thick Slab ship steel as claimed in claim 2, is characterized in that: in described function protective material, and Li
2o weight percentage is that 0.4%, MgO weight percentage is 2.0%, dual alkalinity (CaO/SiO
2) be 1.11, all the other are SiO
2, CaO, Al
2o
3, Na
2o, F
-, k
2o, MnO, C, its percentage composition is SiO
228.5%, CaO 31.5%, Al
2o
35.0%, Na
2o 9.5%, F
-7.0%, k
2o 0.7%, MnO 2.5%, C 3.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010247669.2A CN103785802A (en) | 2010-08-09 | 2010-08-09 | Special functional protection materials of continuous casting crystallizer and for wide and thick plate ship plate steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010247669.2A CN103785802A (en) | 2010-08-09 | 2010-08-09 | Special functional protection materials of continuous casting crystallizer and for wide and thick plate ship plate steel |
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| Publication Number | Publication Date |
|---|---|
| CN103785802A true CN103785802A (en) | 2014-05-14 |
Family
ID=50662093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010247669.2A Pending CN103785802A (en) | 2010-08-09 | 2010-08-09 | Special functional protection materials of continuous casting crystallizer and for wide and thick plate ship plate steel |
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|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104399921A (en) * | 2014-11-13 | 2015-03-11 | 北京首钢股份有限公司 | Casting powder |
| CN110000352A (en) * | 2019-05-05 | 2019-07-12 | 西峡县西保冶金材料有限公司 | A kind of continuous-casting crystallizer especially used function protective material of plastic die steel |
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| CN101745615A (en) * | 2010-01-21 | 2010-06-23 | 河南省西保冶材集团有限公司 | Function protecting material of continuous casting crystallizer for large square low-carbon steel |
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2010
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Patent Citations (5)
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| 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 |
| CN101530896A (en) * | 2008-03-14 | 2009-09-16 | 宝山钢铁股份有限公司 | High casting speed continuous casting covering slag used for ultra-low-carbon steel |
| CN101637812A (en) * | 2009-08-11 | 2010-02-03 | 河南省西保冶材集团有限公司 | Small plate blank continuous casting functional protective material |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104399921A (en) * | 2014-11-13 | 2015-03-11 | 北京首钢股份有限公司 | Casting powder |
| CN110000352A (en) * | 2019-05-05 | 2019-07-12 | 西峡县西保冶金材料有限公司 | A kind of continuous-casting crystallizer especially used function protective material of plastic die steel |
| CN110000352B (en) * | 2019-05-05 | 2021-06-15 | 西峡县西保冶金材料有限公司 | Function protection material for continuous casting crystallizer special for plastic mould steel |
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Application publication date: 20140514 |