CN102652990B - Casting powder for medium carbon peritectic steel continuous casting crystallizer - Google Patents
Casting powder for medium carbon peritectic steel continuous casting crystallizer Download PDFInfo
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- CN102652990B CN102652990B CN201210153879.4A CN201210153879A CN102652990B CN 102652990 B CN102652990 B CN 102652990B CN 201210153879 A CN201210153879 A CN 201210153879A CN 102652990 B CN102652990 B CN 102652990B
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Abstract
The invention belongs to the technical field of steel melting continuous casting production, and particularly relates to casting powder for a medium carbon peritectic steel continuous casting crystallizer sensitive to cracks. The casting powder comprises the following components by weight percentage: 40 to 50 percent of CaO, 40 to 50 percent of SiO2, 1 to 6 percent of B2O, 1 to 4 percent of Li2O, 1 to 5 percent of Al2O3, 1 to 6 percent of BN1 and 1 to 2 percent of inevitable impurities, wherein the impurities comprise 0.03 percent of S and 0.03 percent of P. The preparation method comprises the steps of: fully drying and dehydrating raw materials, weighing and mixing according to weight parts, grinding and uniformly mixing, pre-melting, cooling, powdering, and adopting the conventional casting powder preparing and molding process to obtain granular finished casting powder. The casting powder has relatively low melting temperature and relatively high crystallization temperature, particularly has the advantages of good lubrication and anti-oxidization effects of glass powder and high impurity absorption capacity and the advantages of high heat preservation performance of the powder with the high crystallization temperature and casting blank crack control, and is suitable for pouring medium carbon peritectic steel sensitive to the cracks.
Description
Technical field
The invention belongs to smelting iron and steel continuous casting production technical field, specially refer to the sub-peritectic steel casting powder for continuously casting crystallizer of a kind of carbon for crack-sensitivity.
Background technology
Continuous casting technology is efficient, energy-conservation with it, high-quality, easily be automated and the plurality of advantages such as intelligent is subject to the great attention on metallurgical boundary, the continuous crystallizer protecting slag matching with it has also obtained corresponding development, and becomes indispensable metallurgical auxiliary; Existing continuous casting covering slag mainly adopts SiO
2-Al
2o
3-CaO slag system; add on this basis a small amount of flux (alkali metal or alkaline earth oxide, fluoride, boride etc.) and control molten fast carbonaceous material (carbon black, graphite and coke etc.); this class covering slag has lower fusing point and viscosity; and there is the advantage such as effective of glass dregs lubricant effect and absorb inclusion, but current SiO
2-Al
2o
3-CaO series protection slag, in order to guarantee low fusion temperature, needs the Al of high level
2o
3, this has limited slag and has absorbed Al
2o
3what be mingled with the raising of ability, particularly existing covering slag is the low fusion temperature of assurance, and the basicity of slag, within the scope of 0.9-1.1, makes this slag have significant low-melting glass slag feature, and this covering slag is not suitable for the sub-peritectic steel cast of crack-sensitivity; For the sub-peritectic steel of middle carbon, it is characterized in that surface easily cracks, therefore, continuous casting covering slag should possess two typical features: the one,, covering slag will have lower fusing point, viscosity, to guarantee that covering slag is in mobility, the spreadability of crystallizer high-temperature area, to be that covering slag plays lubricated, anti-oxidation and the prerequisite of the metallurgical function such as absorb inclusion for this, and this slag that needs protection possesses the feature of glass dregs in high-temperature region; The 2nd,, covering slag will possess stronger crystallization ability, be that recrystallization temperature is high, the little crystallization speed of particle size is fast, covering slag low-temperature space in crystallizer forms solid slag film like this, improve the thermal resistance of covering slag, slow down the heat transfer of steel in crystallizer, to reduce the thermograde of steel billet, avoid the generation of sub-peritectic steel face crack; Therefore, sub-peritectic steel continuous casting covering slag for crack-sensitivity, need to possess " low melting temperature and high recrystallization temperature " feature, the lubricated and oxidation-protective effect that has glass dregs concurrently is good, the good heat insulating that the advantage that absorb inclusion ability is strong and high recrystallization temperature slag have, controls the advantage that strand crackle produces; In addition; the covering slag of prior art generally adopts carbonaceous material as covering slag burn-off rate and oxidation resistant additive; carbon-containing protective slag is inevitably to billet surface carburetting; also affect billet quality; therefore; the covering slag of prior art need to further be optimized at aspects such as becoming component selections and content range, solves the problem that covering slag performance that the sub-peritectic steel continuous casting of current crack-sensitivity adopts can not meet the demands.
Summary of the invention
The object of this invention is to provide the sub-peritectic steel casting powder for continuously casting crystallizer of a kind of middle carbon, this covering slag has low melting temperature and high recrystallization temperature, has low melting temperature, low viscosity, high fluidity and spreadability and the good lubrication of glass dregs concurrently and prevent molten steel oxidation and guarantee the metallurgical effects such as absorb inclusion when high temperature; Meanwhile, when temperature reduces, can be in crystallizer the solid slag blanket of formation early, play heat insulation effect, delay cooling in crystallizer of strand, reach and control the object that casting billet surface forms crackle; In addition, covering slag of the present invention adopts carbon-free framework material, realizes and controls the object of covering slag to steel billet carburetting.
The object of the invention is to realize by following technical proposal:
The sub-peritectic steel casting powder for continuously casting crystallizer of middle carbon, is characterized in that described component according to percentage by weight calculating is: CaO 40-50%, SiO
240-50%, B
2o
31-6%, Li
2o 1-4%, Al
2o
31-5%, BN 1-6%, inevitable impurity 1-2%, S<0.03% in impurity, P<0.03%.
Preparation method of the present invention is as follows: by CaO, SiO
2deng raw material abundant mark weigh batching by weight after drying and dehydrating at 150-200 ℃; levigate rear mistake 100 mesh sieves (granularity is less than 0.149mm); then mix; at 1300 ℃, fritting is 30 minutes; slag is broken after naturally cooling; and then abrasive dust, cross 200 mesh sieves (granularity is less than 0.074mm), finally utilize the method for spray drying tower granulation to prepare hollow covering slag particle.
The effect of each main component and as follows with addition of ratio-dependent basis in the present invention:
1) CaO:CaO, as main base-material composition of the present invention, is usingd fat lime as raw material, and CaO plays and absorbs Al
2o
3deng the effect of oxide in steel, dual alkalinity CaO/SiO of the present invention
2determine the scope at 0.8-1.25, adjust as required glass and the crystal property of slag, the content range of CaO is determined the mass fraction at 40-50%() in scope.
2) SiO
2: in CaO base slag system, SiO
2as main covering slag vitrifying constituent element, be the important component that determines the performances such as covering slag fusion temperature, viscosity, spreadability, mobility, the dual alkalinity CaO/SiO of covering slag of the present invention
2determine the scope at 0.8-1.25, adjust as required glass and the crystal property of slag, SiO
2content range determine the mass fraction at 40-50%() in scope.
3) B
2o
3: in the present invention, add B
2o
3main purpose be to reduce the fusion temperature of covering slag, improve the glass properties of covering slag, can improve slag mobility, improve lubricant effect and absorb inclusion ability, B
2o
3suitable interpolation scope at 1-6%(mass fraction) in scope.
4) Li
2o: add Li in the present invention
2the crystallization property that the main purpose of O improves covering slag is crystallizing power, reduces fusion temperature and the viscosity of covering slag simultaneously, improve the liquid covering slag of high temperature mobility, improve lubricant effect and absorb inclusion ability, Li
2the suitable interpolation scope of O is at 1-4%(mass fraction) in scope.
5) Al
2o
3: in the present invention, add Al
2o
3main purpose be to reduce the fusion temperature of covering slag, adjust covering slag and absorb Al
2o
3deng the ability of deoxidation products, Al
2o
3suitable interpolation scope at 1-5%(mass fraction) in scope.
6) BN: the main purpose that adds in the present invention BN is to substitute traditional carbonaceous material, have not carburetting, oxidation resistant advantage, and BN itself has good lubrication property, particularly BN at B of the present invention
2o
3, SiO
2under protection etc. glass ingredient, be difficult for oxidized scaling loss, BN has high-melting-point; in molten mold flux, with solid phase particle, exist, can improve the crystallization property of slag, at casting billet surface, form solid-state protection slag blanket; play heat insulation effect, prevent the formation of slab surface crack.
Main physical and chemical performance index of the present invention is in Table 1:
Table 1 main physical index of the present invention
Compared with prior art, adopt advantage of the present invention as follows:
1. covering slag of the present invention has the two-fold advantage that fusion temperature is low and recrystallization temperature is high concurrently; Fusion temperature is low, and viscosity is at high temperature low, has guaranteed that molten mold flux lubricates, prevents the metallurgical functions such as molten steel oxidation and absorb inclusion in crystallizer; Simultaneously; the recrystallization temperature of covering slag is than the high 100 ℃ of left and right of general acid glass dregs; in crystallizer, form so solid-state protection slag blanket; weaken the heat transfer of strand in crystallizer; avoided the generation of fire check, for the sub-peritectic steel of fire check sensitivity, casting billet surface fire check reduces more than 90%; therefore, the present invention is applicable to the sub-peritectic steel continuous casting of crack-sensitivity.
2. covering slag of the present invention is not containing carbonaceous material, and the BN of employing is the material that a kind of non-oxidizability is stronger than graphite, can, to carburetting in steel, therefore, than graphite, not have more advantage.
3. covering slag of the present invention is containing poisonous and harmful element, not containing the composition of volatile etching apparatus, this covering slag energy extension device service life, reduces costs, and has promotional value.
The specific embodiment
Below in conjunction with embodiment, the invention will be further elaborated; Embodiment is only for the present invention is described, rather than limits by any way the present invention.
embodiment 1
Take lime, silica, boric anhydride, lithia, schmigel and boron nitride as raw material; abundant drying and dewatering at 200 ℃; grind to form weigh batching after fine powder; fritting at 1300 ℃; after cooling, in grinding machine, be milled to 200 mesh sieves (granularity is less than 0.074mm); in mist projection granulating tower, make hollow bead, the particle size range of covering slag is at 0.1-0.4mm.
Prepared covering slag carries out constituent analysis result following (mass percent):
CaO 44%, SiO
245%, B
2o
33%, Li
2o 2%, Al
2o
32%, BN 3%, and surplus is impurity, and wherein S 0.02%, and P 0.02%.
The main physical and chemical performance index of the present embodiment is in Table 2.
embodiment 2
Take lime, silica, boric anhydride, lithia, schmigel and boron nitride as raw material; abundant drying and dewatering at 200 ℃; grind to form weigh batching after fine powder; fritting at 1300 ℃; after cooling, in grinding machine, be milled to 200 mesh sieves (granularity is less than 0.074mm); in mist projection granulating tower, make hollow bead, the particle size range of covering slag is at 0.1-0.4mm.
Prepared covering slag carries out constituent analysis result following (mass percent):
CaO 50%, SiO
240%, B
2o
32%, Li
2o 2%, Al
2o
32%, BN 3%, and surplus is impurity, and wherein S 0.02%, and P 0.02%.
The main physical and chemical performance index of the present embodiment is in Table 2.
embodiment 3
Take lime, silica, boric anhydride, lithia, schmigel and boron nitride as raw material; abundant drying and dewatering at 200 ℃; grind to form weigh batching after fine powder; fritting at 1300 ℃; after cooling, in grinding machine, be milled to 200 mesh sieves (granularity is less than 0.074mm); in mist projection granulating tower, make hollow bead, the particle size range of covering slag is at 0.1-0.4mm.
Prepared covering slag carries out constituent analysis result following (mass percent):
CaO 40%, SiO
250%, B
2o
31%, Li
2o 3%, Al
2o
31%, BN 4%, and surplus is impurity, and wherein S 0.02%, and P 0.02%.
The main physical and chemical performance index of the present embodiment is in Table 2.
embodiment 4
Take lime, silica, boric anhydride, lithia, schmigel and boron nitride as raw material; abundant drying and dewatering at 200 ℃; grind to form weigh batching after fine powder; fritting at 1300 ℃; after cooling, in grinding machine, be milled to 200 mesh sieves (granularity is less than 0.074mm); in mist projection granulating tower, make hollow bead, the particle size range of covering slag is at 0.1-0.4mm.
Prepared covering slag carries out constituent analysis result following (mass percent):
CaO 42%, SiO
240%, B
2o
36%, Li
2o 4%, Al
2o
31%, BN 6%, and surplus is impurity, and wherein S 0.02%, and P 0.02%.
The main physical and chemical performance index of the present embodiment is in Table 2.
Table 2 embodiment result---physical and chemical performance index
From embodiment result, can find out: the compositions indicator of covering slag of the present invention and physical and chemical performance index all meet the demands, on the sub-peritectic steel slab caster mould that is 0.08% in carbon content, use, the loss per ton steel of covering slag is 0.49-0.56 kg/t, meet lubricating requirement, casting billet surface protection slag blanket is even, crystallizer is interior without slag circle, strand is without slag inclusion, without bleedout, compare with the covering slag of prior art, sharpest edges are that the crackle of casting billet surface disappears completely, oscillation mark shoals, transverse crack disappears, strand qualification rate brings up to 100% by 95, bleedout accident is controlled completely, therefore, the mixed carbon comtent of transverse crack and strand covering slag reduces, reduce molten steel recarburization, simultaneously, the comprehensive basicity of covering slag improves, improved slag absorb inclusion ability, particularly hemisphere point temperature, viscosity and the burn-off rate of this slag, be all controlled at suitable scope, and adjusting range is wide, has than the better serviceability of traditional protection slag, therefore has promotional value.
Claims (3)
1. the sub-peritectic steel casting powder for continuously casting crystallizer of carbon in, is characterized in that: the component of described covering slag is calculated according to percentage by weight and is: CaO 40-50%, SiO
240-50%, B
2o
31-6%, Li
2o 1-4%, Al
2o
31-5%, BN 1-6%, inevitable impurity 1-2%, S<0.03% in impurity, P<0.03%.
2. the sub-peritectic steel casting powder for continuously casting crystallizer of a kind of middle carbon as claimed in claim 1, is characterized in that: the particle size range of described covering slag is at 0.1-0.4mm.
3. the preparation method of the sub-peritectic steel casting powder for continuously casting crystallizer of a kind of middle carbon as claimed in claim 1; it is characterized in that: take lime, silica, boric anhydride, lithia, schmigel and boron nitride as raw material; abundant mark weigh batching by weight after drying and dehydrating at 150-200 ℃; levigate rear mistake 100 mesh sieves; then mix; at 1300 ℃, fritting is 30 minutes; slag is broken after naturally cooling; and then abrasive dust; cross 200 mesh sieves, finally utilize the method for spray drying tower granulation to prepare hollow covering slag particle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210153879.4A CN102652990B (en) | 2012-05-18 | 2012-05-18 | Casting powder for medium carbon peritectic steel continuous casting crystallizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210153879.4A CN102652990B (en) | 2012-05-18 | 2012-05-18 | Casting powder for medium carbon peritectic steel continuous casting crystallizer |
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|---|---|
| CN102652990A CN102652990A (en) | 2012-09-05 |
| CN102652990B true CN102652990B (en) | 2014-04-09 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103042187B (en) * | 2012-12-21 | 2016-01-20 | 江苏大学 | A kind of high-titanium alloy welding wire steel protective slag for continuous casting and preparation method thereof |
| CN103433438A (en) * | 2013-08-16 | 2013-12-11 | 莱芜钢铁集团有限公司 | Method for controlling quality of bloom hypo-peritectic steel continuous casting billet |
| CN109706289A (en) * | 2019-01-23 | 2019-05-03 | 铜陵市大明玛钢有限责任公司 | Roll inoxidizability covering slag and preparation method thereof |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100623908B1 (en) * | 2004-06-23 | 2006-09-19 | 스톨베르그 앤드 삼일 주식회사 | Fluorine-free mold flux for the continuous casting of steel and method for producing the same |
| JP4708055B2 (en) * | 2005-03-11 | 2011-06-22 | Ｊｆｅスチール株式会社 | Mold powder for continuous casting of steel |
| KR100749024B1 (en) * | 2006-06-22 | 2007-08-13 | 주식회사 포스코 | Continuous casting method using melting mold flux |
| CN100528406C (en) * | 2007-09-18 | 2009-08-19 | 攀钢集团攀枝花钢铁研究院 | Continuous casting crystallizer protective scoria for weathering steel and manufacturing method thereof |
| CN102085568B (en) * | 2009-12-04 | 2012-11-07 | 丹东泓辉科大高温材料有限公司 | Peritectic steel continuous casting covering slag |
| CN102059330B (en) * | 2011-02-15 | 2013-01-23 | 江苏大学 | Boron-containing fluoride-free covering slag for steel continuous-casting crystallizer and preparation method thereof |
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