CN102009144B - Function protection material for special continuous casting mould of high-speed heavy rail steel with bloom - Google Patents
Function protection material for special continuous casting mould of high-speed heavy rail steel with bloom Download PDFInfo
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- CN102009144B CN102009144B CN2010102476457A CN201010247645A CN102009144B CN 102009144 B CN102009144 B CN 102009144B CN 2010102476457 A CN2010102476457 A CN 2010102476457A CN 201010247645 A CN201010247645 A CN 201010247645A CN 102009144 B CN102009144 B CN 102009144B
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- slag
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Abstract
The invention provides a function protection material for special continuous casting mould of high-speed heavy rail steel with bloom, wherein the contents of BaO and MgO of the function protection material are 2.0 to 3.0 wt. % and 1.0 to 5.0 wt. %, respectively; the binary alkalinity (CaO/SiO2) is 0.6 to 0.8 wt. % and the rest part of the function protection material comprises SiO2, CaO, Al2O3, Na2O, F and K2O. The function protection material for special continuous casting mould of high-speed heavy rail steel with bloom provided by the invention has the advantages that the spreadability, the heat preservation property and the melting property of the function protection material which is arranged within the mould are good, the heat transfer capacities of the four surfaces within the mould are stable and even, the thickness of liquid slag layer is 7 to 11 mm, the slag strip is little, the lubricating property of the function protection material is good, the phenomenon of sticking breakout is prevented, the surface of the casting blank is prevented from slag inclusion and slag bonding and the quality for the surface of the casting blank is good.
Description
Technical field
The invention belongs to the metallurgic auxiliary materials technical field, the continuous-casting crystallizer especially used function protective material of particularly a kind of bloom high speed Properties of Heavy Rail Steel By.
Background technology
Fast development along with Chinese Railway construction and operation; Bullet train becomes the main developing direction of railway operation; The demand of high-quality high speed Properties of Heavy Rail Steel By also increases thereupon, and metallurgy industry is invested main task and developed the important content that high-quality steel are listed development strategy in energetically.In the high-quality steel continuous casting continuous casting production process, also must take the necessary measures to guarantee the quality of product, mainly be new technology such as adopt that electromagnetic agitation, solidification end are gently depressed.Because bloom contraction percentage of area in the operation of rolling is big, but therefore disperse central defect can also make carbon segregation further reduce.So steel mill produces the bloom production that high-quality excellent special steel tends to surpass with section 250mm mostly.Increase owing to add alloy species in the high-quality excellent special steel, cause in the molten steel field trash type many, and content is high.Therefore require function protective material to have the ability of stronger absorbing foreign matter, and after the function protective material absorbing foreign matter, its physicochemical property still can satisfy the requirement of continuous casting process.The continuous casting worker is concerned about and the emphasis of work so the bloom crystallizer function protective material that development and production adapt with it just becomes.Bloom high speed Properties of Heavy Rail Steel By crystallizer function protective material is one of them.
The Anshan iron and steel plant casting machine furnace, cast section: 350 х, 350,280 х 280.Pulling rate is between 0.45～0.75 m/min.; The steel grade of casting: U71, U71Mn, molten steel C:0.68～0.73%, Als:0.02～0.05%; Because the solidification shrinkage rate of this carbon content scope steel is low; What therefore the melt cinder flow channel between crystallizer and the solidified shell became is narrower, guarantees to lubricate so heavy rail steel functional protective material emphasis of design should be placed on, and the assurance of slag consumption is very crucial.The characteristics of such steel grade are that calorific intensity is poor, and cast temperature and casting rate are lower, are easy to generate bonding steel leakage simultaneously.This is little relevant with the initial base shell solidification shrinkage that generates.Base shell intensity and liquidus temperature reduce along with the increase of carbon content in the molten steel, so cast temperature is a little lower than other steel.In order to prevent that molten steel from freezing, Properties of Heavy Rail Steel By will be used thermal insulation excellent function protective material, and bulk density is low.Properties of Heavy Rail Steel By belongs to high-strength abrasion-proof steel, and the uniformity of composition of steel and the degree of purity of steel quality are proposed higher requirement.The crystallizer function protective material lubricates guaranteeing. and the metallurgical function of absorption dissolving molten steel come-up aluminium oxide is very crucial.Thus; In order to realize the optimum operation performance and to obtain satisfied product quality; Function protective material is had higher requirement: 1) in order to ensure sufficient consumption and lubricated; Adopt low basicity, arrange in pairs or groups to reach very low-melting function protective material, to guarantee enough thick liquid slag layer than low viscosity and special flux; 2) reduce the slag circle and generate, can block the passage that melt cinder flows downward when the slag circle is thick, the local long more surperficial lobe of stopping up of time is just serious more; 3) suitable slag consumption, the slag consumption of protection is along with melt cinder viscosity. the mold oscillation frequency. and the minimizing of negative slip rate and pulling rate and increasing; 4) suitable viscosity coefficient of dross and slag film thickness is because the characteristics during the bloom casting: a, ferrostatic pressure are big; B, the linear shrinkage of base shell are big, and strand thermal capacity is big.Ferrostatic pressure accumulates in base shell bight and forms shear stress, so bloom bight defectives such as longitudinal crack, depression the most easily often.The melt cinder inflow is inhomogeneous to produce the space easily between copper wall and scull, solidify thereby cause the inhomogeneous of strand.Because the distribution of slag film on whole solidified shell outer surface can not be uniformly, the inhomogeneous of slag film thickness looms large relatively under the lepthymenia situation of slag; 5) for guaranteeing the molten steel degree of purity that Properties of Heavy Rail Steel By is higher, function protective material needs good absorption molten steel come-up field trash function, and makes the melt cinder rerum natura keep stable. 6), need single-minded compoundly join the carbon mode and to select bulk density for use in order to ensure heat-insulating property.
Summary of the invention
The objective of the invention is to propose a kind of solution Properties of Heavy Rail Steel By bloom surface crater. the continuous-casting crystallizer especially used function protective material of bloom high speed Properties of Heavy Rail Steel By of sticker type breakout, casting billet surface slag inclusion and dry slag problem in the casting.
For realizing the object of the invention; The continuous-casting crystallizer especially used function protective material of described bloom high speed Properties of Heavy Rail Steel By; Its raw material comprises melting charge, brium carbonate, sodium carbonate, fluorite, boron glass powder, graphitic carbon, fused magnesite, import carbon black, bentonite; Its weight percentage is respectively 56%, 5.0%, 11.0%, 4.0%, 12.0%, 2.0%, 2.0%, 2.0%, 4.0%, and the composition and the percentage by weight of said 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%.
The BaO weight percentage is 2.0～3.0% in the said function protective material, and the MgO weight percentage is 1.0～5.0%, dual alkalinity (CaO/SiO
2) be 0.6～0.8, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, K
2O, its weight percentage are SiO
228.0～35.0%, CaO 20.0～28.0%, Al
2O
3<10.0%, Na
2O 10.0～16.0%, F
-3.0 K～6.0%,
2O<0.5%.
Make further detailed description in the face of the present invention down:
Carbon content C:0.68～0.73% of bloom high speed Properties of Heavy Rail Steel By, the characteristics of such steel grade are that calorific intensity is poor, and cast temperature and casting rate are lower, are easy to generate bonding steel leakage simultaneously, and this is little relevant with the initial base shell solidification shrinkage that generates.Heavy rail steel billet shell intensity and liquidus temperature reduce along with the increase of carbon content in the molten steel, so cast temperature is a little lower than other steel.In order to prevent that molten steel from freezing, Properties of Heavy Rail Steel By will be used thermal insulation excellent function protective material, and bulk density is low.Because the solidification shrinkage rate of Properties of Heavy Rail Steel By is low, thus the melt cinder flow channel between crystallizer and the solidified shell become narrower, so heavy rail steel functional protective material emphasis of design should be placed on guarantee lubricated on, the assurance of slag consumption is very crucial.For this reason, design the viscosity and the setting temperature of this function protective material and will hang down, it is big that slag film glass tendency is wanted, to guarantee good lubricating property.
The design of function protective material chemical composition.At first require the dual alkalinity (CaO/SiO of function protective material
2) can not be too high, generally be less than 0.80, to guarantee that the slag film forms good glassy state in the crystallizer, improve lubricating between base shell and the crystallizer, the present invention controls the dual alkalinity of function protective material in 0.6～0.80 scope.Secondly; Adopt the method regulatory function protective material fusing point and the viscosity of multiple flux, wherein BaO is an important flux, and is remarkable to reducing function protective material viscosity and fusing point; BaO can also improve the greasy property of function protective material simultaneously; Reduce the calculus amount that the slag circle is separated out, make slag circle reduced thickness a lot, BaO content control range is 2.0～3.5% in the function protective material of the present invention; MgO can reduce function protective material fusing point, viscosity, crystallization temperature and setting temperature, improves the stability of function protective material, and MgO content control range is 1.0～5.0% 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 in the slag film, separating out nepheline 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 10～16.0%, Na
2O remains reduction fusing point and viscosity in the effect of function protective material; 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 property 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 3.0～6.0% 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.C content control range is 2.0～5.0% in the function protective material of the present invention.
The function protective material physical property is confirmed.The present invention requires function protective material to have lower fusing point, viscosity, setting temperature and burn-off rate faster.Requirement specifically is set is: fusing point (hemisphere point temperature) is 910～970 ℃; 1300 ℃ viscosity is 0.10～0.30 PaS; Setting temperature is 950～1000 ℃ (temperature-viscosity curve judgements); Burn-off rate is 20～40 seconds (test of slag post method).
Join selecting for use and characteristics of slag base-material.The performance of function protective material depends on the selection of system slag base-material, and conventional machine mixes slag and mainly adopts multiple raw material to mix, and has influence on performance variation owing to the back that is heated produces decomposition of chemical compounds, has influenced the stability of slag.This research is selected to join the slag base-material with the pre-melted type slag as function protective material, and this special pre-melted type slag is except containing conventional pre-melted type slag basis, like SiO
2, CaO, Al
2O
3, Na
2O, F-also contain the MgO composition of function protective material needs of the present invention.Because reduced the allocation ratio of raw material, the stability of Slag Properties is improved.Particularly preliminary melting type continuous casting slag base-material ratio has reached 55～60%, has reduced the decomposition combination reaction process in crystallizer, has obviously increased the stability of result of use.
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 bloom high speed heavy rail steel functional protective material, function protective material of the present invention has adopted following quality control standard: 1) every kind of raw material granularity requires through 250 orders; 2) mixing stirs and each 1 hour water mill pulping time.
This function protective material that adopts above-mentioned result of study to produce, cast high speed Properties of Heavy Rail Steel By steel on Anshan iron and steel plant 4 machines 4 stream large square bland continuous-casting machines, the slag consumption of pulling rate when 0.4-1.0 m/min. is 0.45 kg/T steel, molten steel surface liquid slag layer thickness 7～11mm.Show that through site test results when this function protective material used, spreadability, heat insulating ability and meltdown property performance were good in crystallizer; Heat output is stable and even in the crystallizer, satisfies the pulling rate requirement in the fluctuation range; 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 crackle. and slag inclusion and dry slag phenomenon, cc billet surface quality is good.
The specific embodiment
Embodiment one:
The continuous-casting crystallizer especially used function protective material of a kind of bloom high speed Properties of Heavy Rail Steel By; Its raw material comprises melting charge, brium carbonate, sodium carbonate, fluorite, boron glass powder, graphitic carbon, fused magnesite, import carbon black, bentonite; Its weight percentage is respectively 56%, 5.0%, 11.0%, 4.0%, 12.0%, 2.0%, 2.0%, 2.0%, 4.0%, and the composition and the percentage by weight of said 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%.
The BaO weight percentage is 2.2% in the said function protective material, and the MgO weight percentage is 4.5%, dual alkalinity (CaO/SiO
2) be 0.80, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, K
2O, its weight percentage are SiO
228.5%, CaO 23.0%, Al
2O
39.0%, Na
2O 10.5%, F
-3.5%, K
2O 0.4%.
Embodiment two:
The continuous-casting crystallizer especially used function protective material of a kind of bloom high speed Properties of Heavy Rail Steel By; Its raw material comprises melting charge, brium carbonate, sodium carbonate, fluorite, boron glass powder, graphitic carbon, fused magnesite, import carbon black, bentonite; Its weight percentage is respectively 56%, 5.0%, 11.0%, 4.0%, 12.0%, 2.0%, 2.0%, 2.0%, 4.0%, and the composition and the percentage by weight of said 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%.
The BaO weight percentage is 3.0% in the said function protective material, and the MgO weight percentage is 1.5%, dual alkalinity (CaO/SiO
2) be 0.6～0.8, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, K
2O, its weight percentage are SiO
234.0%, CaO 22.0%, Al
2O
33.0%, Na
2O 15.0%, F
-5.7%, K
2O 0.2%.
Embodiment three:
The continuous-casting crystallizer especially used function protective material of a kind of bloom high speed Properties of Heavy Rail Steel By; Its raw material comprises melting charge, brium carbonate, sodium carbonate, fluorite, boron glass powder, graphitic carbon, fused magnesite, import carbon black, bentonite; Its weight percentage is respectively 56%, 5.0%, 11.0%, 4.0%, 12.0%, 2.0%, 2.0%, 2.0%, 4.0%, and the composition and the percentage by weight of said 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%.
The BaO weight percentage is 2.5% in the said function protective material, and the MgO weight percentage is 3.0%, dual alkalinity (CaO/SiO
2) be 0.6～0.8, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, K
2O, its weight percentage are SiO
231.5%, CaO 24.0%, Al
2O
35.0%, Na
2O 13.0%, F
-4.5%, K
2O 0.3%.
Claims (1)
1. continuous-casting crystallizer especially used function protective material of bloom high speed Properties of Heavy Rail Steel By; It is characterized in that: its raw material comprises melting charge, brium carbonate, sodium carbonate, fluorite, boron glass powder, graphitic carbon, fused magnesite, import carbon black, bentonite; Its weight percentage is respectively 56%, 5.0%, 11.0%, 4.0%, 12.0%, 2.0%, 2.0%, 2.0%, 4.0%, and the composition and the percentage by weight of said 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%.
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| CN102009144B true CN102009144B (en) | 2012-11-21 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103008590A (en) * | 2012-12-08 | 2013-04-03 | 内蒙古包钢钢联股份有限公司 | Continuous casting mold covering slag for medium carbon steel containing manganese |
| CN103381474B (en) * | 2013-07-26 | 2015-06-10 | 河南省西保冶材集团有限公司 | Special continuous casting mold protection material for bearing steel |
| CN104707958B (en) * | 2013-12-11 | 2017-08-25 | 宝山钢铁股份有限公司 | Casting peritectic steel high alkalinity continuous casting covering slag |
| CN103736953B (en) * | 2013-12-24 | 2016-08-24 | 郑州裕丰高新材料有限公司 | Pre-melted type square blank crystallizer covering slag and preparation method thereof |
| CN106735023B (en) * | 2016-12-30 | 2019-04-05 | 河南省西保冶材集团有限公司 | A kind of continuous-casting crystallizer especially used function protective material of hyperoxia glassed steel |
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|---|---|---|---|---|
| US5179997A (en) * | 1991-09-12 | 1993-01-19 | Atlantic Metals Corporation | Process for insulating molten steel during continuous casting |
| CN101214534A (en) * | 2008-01-08 | 2008-07-09 | 河南通宇冶材集团有限公司 | Preliminary melting type continuous casting crystallizer protecting slag and preparation thereof |
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| CN102009144A (en) | 2011-04-13 |
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