CN102652990A - 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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- CN102652990A CN102652990A CN2012101538794A CN201210153879A CN102652990A CN 102652990 A CN102652990 A CN 102652990A CN 2012101538794 A CN2012101538794 A CN 2012101538794A CN 201210153879 A CN201210153879 A CN 201210153879A CN 102652990 A CN102652990 A CN 102652990A
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- slag
- covering slag
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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 a kind of inferior peritectic steel casting powder for continuously casting crystallizer of the responsive carbon of crackle that is used for.
Background technology
Continuous casting technology is efficient, energy-conservation with it, high-quality, easily be automated and plurality of advantages such as intellectuality receives the great attention on metallurgical boundary; The continuous crystallizer protecting slag that matches has with it also obtained corresponding development, and becomes indispensable metallurgical auxiliary; Prior continuous casting protective slag mainly adopts SiO
2-Al
2O
3-CaO slag system; The carbonaceous material (carbon black, graphite and coke etc.) that adds a small amount of flux (alkali metal or alkaline earth oxide, fluoride, boride etc.) and the molten speed of control on this basis; This type covering slag has lower fusing point and viscosity; And the advantage such as effective that has that glass slag lubricant effect and absorption be mingled with, but present SiO
2-Al
2O
3-CaO series protection slag needs the Al of high level in order to guarantee low fusion temperature
2O
3, this has limited slag and has absorbed Al
2O
3Be mingled with the raising of ability, particularly existing covering slag is to guarantee low fusion temperature, and the basicity of slag makes this slag have significant low-melting glass slag characteristic in the 0.9-1.1 scope, and this covering slag is not suitable for the responsive inferior peritectic steel cast of crackle; For the inferior peritectic steel of middle carbon; It is characterized in that the surface is easy to generate crackle, therefore, continuous casting covering slag should possess two typical characteristics: the one; Covering slag will have lower fusing point, viscosity; Guaranteeing flowability, the spreadability of covering slag at the crystallizer high-temperature area, to be that covering slag plays lubricated, anti-oxidation and the prerequisite that absorbs metallurgical functions such as being mingled with for this, and this slag that needs protection possesses the characteristic of glass slag in the high-temperature region; The 2nd; Covering slag will possess stronger crystallization ability, and promptly recrystallization temperature is high, the little crystallization speed of particle size is fast, and covering slag low-temperature space in crystallizer forms the solid slag film like this; Improve the thermal resistance of covering slag; Slow down the heat transfer of steel in the crystallizer,, avoid the generation of inferior peritectic steel face crack to reduce the thermograde of steel billet; Therefore; For the responsive inferior peritectic steel continuous casting covering slag of crackle; Need possess " low melting temperature and high recrystallization temperature " characteristic; Lubricated and the oxidation-protective effect that promptly has the glass slag concurrently is good, absorbs to be mingled with the good heat insulating that the strong advantage of ability and high recrystallization temperature slag have, the advantage that control 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; The carbon-containing protective slag also influences billet quality, therefore inevitably to billet surface carburetting; The covering slag of prior art need further be optimized at aspects such as becoming component selections and content range, solves the problem that the covering slag performance of the responsive inferior peritectic steel continuous casting employing of present crackle can not meet the demands.
Summary of the invention
The purpose of this invention is to provide the inferior 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, when high temperature, has low melting temperature, low viscosity, high fluidity and spreadability and the good lubrication of glass slag concurrently and prevent the molten steel oxidation and guarantee to absorb metallurgical effect such as to be mingled with; Simultaneously, when temperature reduces, can play heat insulation effect, delay the cooling of strand in crystallizer, reach the purpose that the control casting billet surface forms crackle than the solid slag blanket of formation early in crystallizer; In addition, covering slag of the present invention adopts carbon-free framework material, realizes the purpose of control covering slag to steel billet carburetting.
The objective of the invention is to realize through following technical proposal:
The inferior peritectic steel casting powder for continuously casting crystallizer of carbon in a kind of is characterized in that said 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%, unavoidable impurities 1-2%, S in the impurity<0.03%, P<0.03%.
Preparation method of the present invention is following: with CaO, SiO
2Deng raw material at 150-200 ℃ of following mark weigh batching by weight behind the abundant drying and dehydrating; 100 mesh sieves (granularity is less than 0.149mm) are crossed in levigate back, and mixing then was 1300 ℃ of following fritting 30 minutes; Slag is broken after cooling off naturally; And then abrasive dust, cross 200 mesh sieves (granularity is less than 0.074mm), utilize the spray drying tower process for granulating to prepare hollow covering slag particle at last.
The effect of each main component and confirm according to as follows among the present invention with addition of ratio:
1) CaO:CaO is as main base-material composition of the present invention, and as raw material, CaO plays and absorbs Al with fat lime
2O
3Deng the effect of oxide in the steel, dual alkalinity CaO/SiO of the present invention
2Confirm the scope at 0.8-1.25, adjust the glass property and the crystal property of slag as required, the content range of CaO is confirmed in 40-50% (mass fraction) scope.
2) SiO
2: in CaO base slag system, SiO
2As main covering slag vitrifying constituent element, be the important component of performances such as decision covering slag fusion temperature, viscosity, spreadability, flowability, the dual alkalinity CaO/SiO of covering slag of the present invention
2Confirm scope, adjust the glass property and the crystal property of slag as required, SiO at 0.8-1.25
2Content range confirm in 40-50% (mass fraction) scope.
3) B
2O
3: add B among the present invention
2O
3Main purpose be to reduce the fusion temperature of covering slag, improve the glass properties of covering slag, can improve slag flowability, improve lubricant effect and absorption is mingled with ability, B
2O
3Suitable interpolation scope in 1-6% (mass fraction) scope.
4) Li
2O: add Li among the present invention
2The crystallization property that the main purpose of O improves covering slag is a crystallizing power, reduces the fusion temperature and the viscosity of covering slag simultaneously, improve the liquid covering slag of high temperature flowability, improve lubricant effect and absorption is mingled with ability, Li
2The suitable interpolation scope of O is in 1-4% (mass fraction) scope.
5) Al
2O
3: add Al among the present invention
2O
3Main purpose be to reduce the fusion temperature of covering slag, the adjustment covering slag absorbs Al
2O
3Deng the ability of deoxidation products, Al
2O
3Suitable interpolation scope in 1-5% (mass fraction) scope.
6) BN: the main purpose that adds BN in the present invention 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 the protection etc. glass ingredient, be difficult for oxidized scaling loss, BN has high-melting-point; In molten mold flux, exist, can improve the crystallization property of slag, form solid-state protection slag blanket at casting billet surface with the solid phase particle; Play heat insulation effect, prevent the formation of slab surface crack.
Main physical and chemical performance index of the present invention is seen table 1:
Table 1 main physical index of the present invention
Compared with prior art, adopt advantage of the present invention following:
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 at high temperature is low, has guaranteed that molten mold flux lubricates, prevents metallurgical functions such as molten steel oxidation and absorption are mingled with in crystallizer; Simultaneously, the recrystallization temperature of covering slag is higher about 100 ℃ than general acid glass slag, in crystallizer, forms solid-state protection slag blanket like this; Weaken the heat transfer of strand in the crystallizer; Avoided the generation of fire check, for the responsive inferior peritectic steel of fire check, the casting billet surface fire check reduces more than 90%; Therefore, the present invention is applicable to the inferior peritectic steel continuous casting that crackle is responsive.
2. covering slag of the present invention is the carbonaceous material not, and the BN of employing is a kind of non-oxidizability material stronger than graphite, can carburetting in steel, therefore, have more advantage than graphite.
3. covering slag of the present invention does not contain poisonous harmful components, does not contain the composition of volatile etching apparatus, and this covering slag can prolong service life of equipment, reduces cost, and has promotional value.
The specific embodiment
Below in conjunction with embodiment the present invention is done further elaboration; Embodiment only is used to explain the present invention, rather than limits the present invention by any way.
Embodiment 1
With lime, silica, boric anhydride, lithia, schmigel and boron nitride is raw material; Abundant drying and dewatering under 200 ℃; Grind to form weigh batching behind the fine powder, 1300 ℃ of following fritting, the cooling back was milled to 200 mesh sieves (granularity is less than 0.074mm) in grinding machine; In the mist projection granulating tower, process hollow bead, the particle size range of covering slag is at 0.1-0.4mm.
Prepared covering slag carries out composition analysis result (mass percent) as follows:
CaO 44%, SiO
245%, B
2O
33%, Li
2O 2%, Al
2O
32%, BN 3%, and surplus is an impurity, and wherein S 0.02%, and P 0.02%.
The main physical and chemical performance index of present embodiment is seen table 2.
Embodiment 2
With lime, silica, boric anhydride, lithia, schmigel and boron nitride is raw material; Abundant drying and dewatering under 200 ℃; Grind to form weigh batching behind the fine powder, 1300 ℃ of following fritting, the cooling back was milled to 200 mesh sieves (granularity is less than 0.074mm) in grinding machine; In the mist projection granulating tower, process hollow bead, the particle size range of covering slag is at 0.1-0.4mm.
Prepared covering slag carries out composition analysis result (mass percent) as follows:
CaO 50%, SiO
240%, B
2O
32%, Li
2O 2%, Al
2O
32%, BN 3%, and surplus is an impurity, and wherein S 0.02%, and P 0.02%.
The main physical and chemical performance index of present embodiment is seen table 2.
Embodiment 3
With lime, silica, boric anhydride, lithia, schmigel and boron nitride is raw material; Abundant drying and dewatering under 200 ℃; Grind to form weigh batching behind the fine powder, 1300 ℃ of following fritting, the cooling back was milled to 200 mesh sieves (granularity is less than 0.074mm) in grinding machine; In the mist projection granulating tower, process hollow bead, the particle size range of covering slag is at 0.1-0.4mm.
Prepared covering slag carries out composition analysis result (mass percent) as follows:
CaO 40%, SiO
250%, B
2O
31%, Li
2O 3%, Al
2O
31%, BN 4%, and surplus is an impurity, and wherein S 0.02%, and P 0.02%.
The main physical and chemical performance index of present embodiment is seen table 2.
Embodiment 4
With lime, silica, boric anhydride, lithia, schmigel and boron nitride is raw material; Abundant drying and dewatering under 200 ℃; Grind to form weigh batching behind the fine powder, 1300 ℃ of following fritting, the cooling back was milled to 200 mesh sieves (granularity is less than 0.074mm) in grinding machine; In the mist projection granulating tower, process hollow bead, the particle size range of covering slag is at 0.1-0.4mm.
Prepared covering slag carries out composition analysis result (mass percent) as follows:
CaO 42%, SiO
240%, B
2O
36%, Li
2O 4%, Al
2O
31%, BN 6%, and surplus is an impurity, and wherein S 0.02%, and P 0.02%.
The main physical and chemical performance index of present embodiment is seen table 2.
Table 2 embodiment result---physical and chemical performance index
Can find out from embodiment result: the compositions indicator of covering slag of the present invention and physical and chemical performance index all meet the demands, and in carbon content are to use on 0.08% the inferior peritectic steel slab caster mould, and the loss per ton steel of covering slag is 0.49-0.56 kg/t, satisfies lubricating requirement; Casting billet surface protection slag blanket is even, no slag circle in the crystallizer, and strand does not have slag inclusion, no bleedout; Compare with the covering slag of prior art, sharpest edges are the crackle complete obiteration of casting billet surface, and oscillation mark shoals; Transverse crack disappears, and the strand qualification rate brings up to 100% by 95, and the bleedout accident is able to control fully; Therefore, the mixed carbon comtent of transverse crack and strand covering slag reduces, and reduces molten steel recarburization; Simultaneously, the comprehensive basicity of covering slag improves, and has improved slag and has absorbed the ability that is mingled with; Particularly hemisphere point temperature, viscosity and the burn-off rate of this slag all are controlled at suitable scope, and adjusting range is wide, have than the better serviceability of traditional protection slag, therefore have promotional value.
Claims (3)
1. the inferior peritectic steel casting powder for continuously casting crystallizer of carbon in a kind, it is characterized in that: the component of said 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%, unavoidable impurities 1-2%, S in the impurity<0.03%, P<0.03%.
2. the inferior peritectic steel casting powder for continuously casting crystallizer of a kind of middle carbon as claimed in claim 1, it is characterized in that: the particle size range of said covering slag is at 0.1-0.4mm.
3. the preparation method of the inferior peritectic steel casting powder for continuously casting crystallizer of a kind of middle carbon as claimed in claim 1; It is characterized in that: with lime, silica, boric anhydride, lithia, schmigel and boron nitride is raw material, and at 150-200 ℃ of following mark weigh batching by weight behind the abundant drying and dehydrating, 100 mesh sieves are crossed in levigate back; Mixing then; 1300 ℃ of following fritting 30 minutes, slag was broken after cooling off naturally, and then abrasive dust; Cross 200 mesh sieves, utilize the spray drying tower process for granulating to prepare hollow covering slag particle at last.
Priority Applications (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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| 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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| Publication Number | Publication Date |
|---|---|
| CN102652990A true CN102652990A (en) | 2012-09-05 |
| CN102652990B CN102652990B (en) | 2014-04-09 |
Family
ID=46728810
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|---|---|---|---|
| CN201210153879.4A Expired - Fee Related CN102652990B (en) | 2012-05-18 | 2012-05-18 | Casting powder for medium carbon peritectic steel continuous casting crystallizer |
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Cited By (4)
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|---|---|---|---|---|
| CN103042187A (en) * | 2012-12-21 | 2013-04-17 | 江苏大学 | Covering slag for continuously casting high titanium alloy welding wire steel and method for preparing covering slag |
| 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 |
| 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 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103042187A (en) * | 2012-12-21 | 2013-04-17 | 江苏大学 | Covering slag for continuously casting high titanium alloy welding wire steel and method for preparing covering slag |
| 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 |
| 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 |
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| Publication number | Publication date |
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| CN102652990B (en) | 2014-04-09 |
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Granted publication date: 20140409 Termination date: 20170518 |