CN1824429A - High draw speed plate blank continuous casting low carbon steel crystallizer protective slag - Google Patents
High draw speed plate blank continuous casting low carbon steel crystallizer protective slag Download PDFInfo
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- CN1824429A CN1824429A CN 200510024060 CN200510024060A CN1824429A CN 1824429 A CN1824429 A CN 1824429A CN 200510024060 CN200510024060 CN 200510024060 CN 200510024060 A CN200510024060 A CN 200510024060A CN 1824429 A CN1824429 A CN 1824429A
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- slag
- continuous casting
- carbon steel
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Abstract
The present invention relates to a high pulling rate sheet billet continuously-casting low-carbon crystallizer protective slag. Said protective slag is formed from the following ingredients: (by wt%) melting material 50-65%, lithium carbonate 1.2-3.6%, sodium carbonate 2.3-6.0%, fluorite is 3.0-6.9%, quartz sand 6.0-9.5%, satellite 7.0-10.0%, manganese ore powder 5.0-9.0%, ferrous and 1.0-3.5%, carbon blank 2.0-7.0% and bentonite 2.0-5.5%.
Description
Technical field:
The present invention relates to the metallurgic auxiliary materials crystallizer protecting residue, particularly high draw speed plate blank continuous casting low carbon steel crystallizer protective slag.
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.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; and then cause the casting billet surface defective; even the generation sticker type breakout, especially pour into a mould period in unstable state.Therefore, along with improving constantly of pulling rate, carry out the crystallizer protecting residue Study on Technology that adapts with pulling rate is the emphasis that the continuous casting worker is concerned about and works always.
The 2# slab caster that Mei Gang is newly-built, cast section: 210 * 900～1200mm
2Collateral security stove machine coupling and output require to set out, and require this conventional slab caster work pulling rate to be up to 2.4m/min, and generally pulling rate is the highest in the similar casting machine of should this conventional slab caster pulling rate having gone into operation at home between 1.5～2.4m/min..Along with the further raising of pulling rate, there are two limiting factors to solve: the frictional force between freezing rate and base shell and crystallizer wall.Therefore, playing that lubricated strand reduces friction and the correct application of the crystallizer protecting residue of crystallization control device heat compensator conducting property, is the key that high casting speed continuous casting is achieved.Thus, in order to realize the optimum operation performance and obtain satisfied product quality that covering slag is had higher requirement: 1) slagging speed is fast, can in time replenish the quick consumption of melt cinder, in high speed casting or pulling rate variation situation greatly, still can keep enough covering slag consumptions; 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) covering slag has stable melting characteristic and control heat energy power when high pulling rate and pulling rate change greatly.In a word, the core of high pulling rate covering slag technology is exactly quick slagging, reaches certain slag consumption, to guarantee lubricating strand; Also satisfy simultaneously the requirement that different steel grade cast are conducted heat and controlled crystallizer.
Summary of the invention:
The objective of the invention is to propose a kind of high draw speed plate blank continuous casting low carbon steel crystallizer protective slag that solves sticker type breakout, casting billet surface slag inclusion and dry slag problem in the high-speed continuous casting.For realizing purpose of the present invention; technical scheme of the present invention is: high draw speed plate blank continuous casting low carbon steel crystallizer protective slag; comprise melting charge, lithium carbonate, sodium carbonate, fluorite, quartz sand, wollastonite, manganese ore powder, iron mud, carbon black, bentonite, its weight percentage scope is respectively 50～65%, 1.2 ~ 3.6%, 2.3 ~ 6.0%, 3.0 ~ 6.9%, 6.0 ~ 9.5%, 7.0 ~ 10.0%, 5.0 ~ 9.0%, 1.0 ~ 3.5%, 2.0 ~ 7.0%, 2.0 ~ 5.5%.
Li in the covering slag
2The O weight percentage is 1.0～1.5%, and the MnO weight percentage is 2.0～3.0%, and the MgO weight percentage is 3.0～5.0%, Fe
2O
3Weight percentage is 0.7～1.5%, dual alkalinity (CaO/SiO
2) be 0.93～0.97, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, its percentage composition is SiO
228.0～34.0%, CaO 27.0～33.0%, Al
2O
3＜5.0%, Na
2O 6.0～7.0%, F
-5.0 k～6.0%,
2O＜0.5%.
The carbon content of slab low carbon steel is generally less than 0.08%, does not have peritectic reaction in process of setting.Mild steel is big in meniscus place solidification shrinkage, and the mild steel pulling rate is big simultaneously, so the emphasis of low-carbon steel protecting slag also is to be to lubricate; Being mingled with more claimed slag absorbability in addition in the mild steel will get well, and prevents casting billet surface slag inclusion and dry slag.
The design of covering slag chemical composition.Dual alkalinity (the CaO/SiO of at first claimed slag
2) can not be too high, generally be less than 1.0, 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 covering slag in 0.93～0.97 scope.Secondly, adopt the method for multiple flux to regulate covering slag fusing point and viscosity, wherein li
2O is an important flux, to reducing covering slag viscosity and fusing point highly significant, while Li
2O can also improve the greasy property of covering slag, especially high pulling rate is required low melting point and low viscous covering slag particularly suitable, Li in the covering slag of the present invention
2O content control range is 1.0～1.5%; MnO can not only reduce fusing point, viscosity and the setting temperature of covering slag, can also improve the burn-off rate of covering slag, quicken the formation of melt cinder, less to the crystallization temperature influence of covering slag simultaneously, help stablizing the slag film and conduct heat, MnO content control range is 2.0～3.0% in the covering slag of the present invention; A certain amount of MgO also can reduce covering slag fusing point, viscosity, crystallization temperature and setting temperature, improves the stability of covering slag, and MgO content control range is 3.0～5.0% in the covering slag of the present invention; Na as GPF (General Protection False slag flux important component
2Content can not be too high in covering slag 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 covering slag
2O content also can improve the surface tension of covering slag simultaneously, helps slag-Jin and separates, and reduces casting billet surface slag inclusion and dry slag, Na in the covering slag of the present invention
2O content control range is 6.0～7.0%, Na
2O remains reduction fusing point and viscosity in the effect of covering slag; F in the covering slag
-Main effect is to reduce slag viscosity, improves the melt cinder flowability, but will pay special attention to control the F in the covering slag in the present invention
-If content is 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, for this reason, and F in the covering slag of the present invention
-The content control range is 5.0～6.0%.At last, claimed exactly slag melts fast, forms enough liquid slag layers and guarantees 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 covering slag.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 3.0～4.0% in the covering slag of the present invention, Fe
2O
3The content control range is 0.7～1.5%.
The covering slag physical property is determined.The claimed slag of the present invention has lower fusing point, viscosity, setting temperature and burn-off rate faster.Requirement specifically is set is: fusing point (hemisphere point temperature) is 1040～1070 ℃; 1300 ℃ viscosity is 0.10～0.16PaS; Setting temperature is 1080～1120 ℃ (temperature-viscosity curve judgements); Burn-off rate is 20～30 seconds (test of slag post method).
Join selecting for use and characteristics of slag base-material.The performance of covering slag 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.It is melting charge that the present invention selects to join the slag base-material with the pre-melted type slag as covering slag, and this pre-melted type slag is except containing conventional pre-melted type slag basis, as SiO
2, CaO, Al
2O
3, Na
2O, F
-, also contain the MgO composition of covering slag 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 is that the melting charge ratio has reached 50～65%, 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 covering slag 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 covering slag, make the covering slag of producing melt uniformity, avoid fractional melting and slagging scorification bar, covering slag of the present invention has adopted following quality control standard: 1) every kind of raw material granularity requires by 250 orders; 2) mixing stirs and each 1-2 of water mill pulping time hour.
Beneficial effect of the present invention: the present invention is at plum steel 210 * 900～1200mm
2Pour into a mould carbon aluminium-killed steel on the 2# slab caster, the slag consumption when pulling rate is stabilized in 2.0m/min. is 0.45kg/T steel, molten steel surface liquid slag layer thickness 8～12mm.Show that through site test results when this covering slag 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 covering slag 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 by embodiment, the invention will be further described: for example 1,2# melting charge (production of Henan Xixia Mine county protective material Group Co.,Ltd), lithium carbonate, sodium carbonate, fluorite, quartz sand, wollastonite, manganese ore powder, iron mud (Main Ingredients and Appearance Fe
2O
3), carbon black, bentonite, its weight percentage scope is respectively 58%, 3.0%, 5.0%, 4.0%, 7.0%, 9.0%, 6.0%, 1.0%, 4.0%, 3.0%.Li in the covering slag
2The O weight percentage is 1.0～1.5%, and the MnO weight percentage is 2.0～3.0%, and the MgO weight percentage is 3.0～5.0%, Fe
2O
3Weight percentage is 0.7～1.5%, dual alkalinity (CaO/SiO
2) be 0.93～0.97, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, its percentage composition is SiO
228.0～34.0%, CaO 27.0～33.0%, Al
2O
3＜5.0%, Na
2O 6.0～7.0%, F
-5.0 k～6.0%,
2O＜0.5%.Covering slag of the present invention has adopted following quality control standard: 1) every kind of raw material granularity requires by 250 orders; 2) mixing stirs and each 1 hour water mill pulping time.For example 2,2# melting charge, lithium carbonate, sodium carbonate, fluorite, quartz sand, wollastonite, manganese ore powder, iron mud, carbon black, bentonite, its weight percentage scope is respectively 53%, 1.5%, 3.5%, 4.0%, 6.5%, 7.0%, 6.0%, 1.2%, 4.0%, 3.0%.All the other are identical with embodiment 1.For example 3,2# melting charge, lithium carbonate, sodium carbonate, fluorite, quartz sand, wollastonite, manganese ore powder, iron mud, carbon black, bentonite, its weight percentage scope is respectively 62%, 3.5%, 3.0%, 3.0%, 6.0%, 7.0%, 9.0%, 3.0%, 7.0%, 5.0%.All the other are identical with embodiment 1.
Claims (4)
1. high draw speed plate blank continuous casting low carbon steel crystallizer protective slag, the percentage by weight of its constituent is: melting charge 50～65%, lithium carbonate 1.2～3.6%, sodium carbonate 2.3～6.0%, fluorite 3.0～6.9%, quartz sand 6.0～9.5%, wollastonite 7.0～10.0%, manganese ore powder 5.0～9.0%, iron mud 1.0～3.5%, carbon black 2.0～7.0%, bentonite 2.0～5.5%.
2. high draw speed plate blank continuous casting low carbon steel crystallizer protective slag according to claim 1 is characterized in that Li in the described covering slag
2The O weight percentage is 1.0～1.5%, and the MnO weight percentage is 2.0～3.0%, and the MgO weight percentage is 3.0～5.0%, Fe
2O
3Weight percentage is 0.7～1.5%, and surplus is SiO
2, CaO, Al
2O
3, Na
2O, F
-, K
2O, its percentage composition are SiO
228.0～34.0%, CaO27.0～33.0%, Al
2O
3＜5.0%, Na
2O 6.0～7.0%, F
-5.0 K～6.0%,
2O＜0.5%, C 3.0～4.0%.
3. high draw speed plate blank continuous casting low carbon steel crystallizer protective slag according to claim 1 and 2 is characterized in that covering slag dual alkalinity CaO/SiO
2Be 0.93～0.97.
4, high draw speed plate blank continuous casting low carbon steel crystallizer protective slag according to claim 1 is characterized in that order number 〉=250 orders of each component.
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|---|---|---|---|
| CNB2005100240608A CN100342997C (en) | 2005-02-25 | 2005-02-25 | High draw speed plate blank continuous casting low carbon steel crystallizer protective slag |
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|---|---|---|---|
| CNB2005100240608A CN100342997C (en) | 2005-02-25 | 2005-02-25 | High draw speed plate blank continuous casting low carbon steel crystallizer protective slag |
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| CN1824429A true CN1824429A (en) | 2006-08-30 |
| CN100342997C CN100342997C (en) | 2007-10-17 |
Family
ID=36935357
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| CNB2005100240608A Expired - Fee Related CN100342997C (en) | 2005-02-25 | 2005-02-25 | High draw speed plate blank continuous casting low carbon steel crystallizer protective slag |
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| CN104439134A (en) * | 2014-12-22 | 2015-03-25 | 河南省西保冶材集团有限公司 | Slab 430 stainless steel continuous casting crystallizer casting powder |
| CN106735023A (en) * | 2016-12-30 | 2017-05-31 | 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 |
| 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 |
| CN110315037B (en) * | 2018-03-29 | 2022-02-22 | 宝山钢铁股份有限公司 | Covering agent for preventing tundish from being damaged by melting and application |
| CN110315037A (en) * | 2018-03-29 | 2019-10-11 | 宝山钢铁股份有限公司 | One kind prevents tundish from melting damage coverture and application |
| CN109967706A (en) * | 2019-05-05 | 2019-07-05 | 西峡县西保冶金材料有限公司 | Ultra low carbon IF steel function protecting material of continuous casting crystallizer |
| 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 |
| CN111604484A (en) * | 2020-04-23 | 2020-09-01 | 华北理工大学 | Super high drawing speed thin slab continuous casting covering slag for low carbon steel |
| CN111604484B (en) * | 2020-04-23 | 2022-03-22 | 华北理工大学 | Super high drawing speed thin slab continuous casting covering slag for low carbon steel |
| CN111778453A (en) * | 2020-07-17 | 2020-10-16 | 攀钢集团攀枝花钢钒有限公司 | Method for reducing Q195-BG steel continuous casting bonding breakout |
| 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 |
| CN112355261B (en) * | 2020-10-26 | 2022-06-28 | 中天钢铁集团有限公司 | Crystallizer casting powder suitable for producing peritectic steel through efficient continuous casting |
| CN113399630A (en) * | 2021-06-15 | 2021-09-17 | 阳春新钢铁有限责任公司 | Function protection material for continuous casting crystallizer special for small square billet ultrahigh pulling speed |
| CN114472823A (en) * | 2021-12-29 | 2022-05-13 | 武钢中冶工业技术服务有限公司 | Crystallizer casting powder |
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