CN101898232A - Mould powder for manganese-containing low content alloy peritectic steel subjected to continuous casting by thick slab caster - Google Patents
Mould powder for manganese-containing low content alloy peritectic steel subjected to continuous casting by thick slab caster Download PDFInfo
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- CN101898232A CN101898232A CN2009100521686A CN200910052168A CN101898232A CN 101898232 A CN101898232 A CN 101898232A CN 2009100521686 A CN2009100521686 A CN 2009100521686A CN 200910052168 A CN200910052168 A CN 200910052168A CN 101898232 A CN101898232 A CN 101898232A
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Abstract
The invention relates to metallurgical auxiliary material mould powder, in particular to mould powder for manganese-containing low content alloy peritectic steel which is subjected to continuous casting by a thick slab caster. The mould powder for the manganese-containing low content alloy peritectic steel which is subjected to the continuous casting by the thick slab caster comprises cement clinker, wollastonite, fluorite, sodium carbonate, lithium carbonate, slaked lime, refining slag powder and carbon black; the mould powder comprises the chemical components in percentage by weight: 4.0 to 5.0 percent of Li2O, 28.0 to 31.0 percent of SiO2, 48.0 to 51.0 percent of CaO, 3.0 to 6.0 percent of Al2O3, 0.5 to 1.5 percent of Na2O, 6.0 to 8.0 percent of F<->, 1.0 to 2.0 percent of MgO, 0.5 to 1.0 percent of Fe2O3 and 1.5 to 2.0 percent of C. The mould powder solves the problem of high incidence of longitudinal cracks on the surface of a casting blank in the process of the continuous casting for the manganese-containing low content alloy peritectic steel by the thick slab caster, and has the advantages of low melting point and solidification temperature, and short crystallization incubation time.
Description
Technical field
The present invention relates to the metallurgic auxiliary materials crystallizer protecting residue, particularly a kind of Wide and Thick Slab continuous casting containing manganses low-alloy peritectic steel crystallizer covering slag.
Background technology
Surface longitudinal crack of slab is the modal mass defect of conventional slab caster cast peritectic steel, and the quality of the type cracking frequency and crystallizer protecting residue performance has substantial connection.Strand is along with width increases, the tension that casting billet surface is subjected to constantly increases, and generous slab central point can be than the height of common slab with the temperature difference of side edge, and the shrinkage stress of generation and thermal stress are concentrated at the center easily, thereby more common slab more is easy to generate surface longitudinal crack.In addition, phosphorus content is in 0.08%～0.17% steel grade, in process of setting δ+L liquid phase → gamma reaction can take place, and produces strong linear shrinkage and volume contraction, makes the steel grade of cast carbon content in this scope be easy to generate surface longitudinal crack most.For the cast of generous conventional slab caster contain the manganese Hi-Stren steel, not only phosphorus content is in 0.09%～0.14% peritectic reaction intense zone in the steel; But also contain higher Mn, V, Nb equal strength element; Casting blank section is big simultaneously, and cross dimensions is 220～300mm * 1200～2300mm, and is inhomogeneous from the heat of strand derivation heat too many and that derive near the molten steel meniscus in crystallizer, so more be easy to generate slab surface crack.This kind steel slab surface lobe rate is once up to 17.4%, far above the similar steel grade surface longitudinal crack of slab of general sheet billet continuous casting incidence by statistics.Crystallizer protecting residue typical case chemical composition percentage by weight commonly used is: CaO 43%, SiO
234%, Na
2O 6%, Li
2O 1%, F
-8%, Al
2O
35%, C 3%; Dual alkalinity (CaO/SiO
2) be 1.27; Physical property is: 1145 ℃ of fusing points, 1300 ℃ viscosity 0.60PaS, 1215 ℃ of setting temperatures, 32 seconds crystallization incubation times.
In addition, the uniformity of crystallizer protecting residue slag film thickness is important too, and the uniformity of slag film is the key factor that influences base shell face crack and greasy property.The slag film is inhomogeneous, can make the strand heat radiation inhomogeneous, thereby make the regional area shell thickness inhomogeneous, for the big medium carbon steel steel grade of amount of contraction, especially is easy to generate vertical depression and crackle.Referring to Fig. 2 a; because existing crystallizer protecting residue has higher setting temperature and crystallization speed is slow; so in the crystallizer protecting residue membrane structure; existing slag solid slag film 6 is very thin and to export 3 places at crystallizer very thick at meniscus surface area 9 places; be unfavorable for the slow cooling at meniscus place, and existing melt cinder film 5 is very thin in crystallizer 3 exits, is unfavorable for lubricating; cause existing crystallizer protecting residue lubricated all undesirable, be easy to generate vertical depression and crackle control crackle and improvement.
Summary of the invention
The purpose of this invention is to provide a kind of Wide and Thick Slab continuous casting containing manganses low-alloy peritectic steel crystallizer covering slag, this covering slag has solved the high problem of surface longitudinal crack of slab incidence in the Wide and Thick Slab continuous casting containing manganses low-alloy peritectic steel process.
In order to realize purpose of the present invention; technical scheme of the present invention is: a kind of Wide and Thick Slab continuous casting containing manganses low-alloy peritectic steel crystallizer covering slag; comprise clinker, wollastonite, fluorite, sodium carbonate, lithium carbonate, calcium hydroxide, refining ground-slag, carbon black, it is characterized in that the percentage by weight of chemical composition in the described covering slag is: Li
2O 4.0～5.0%, SiO
228.0～31.0%, CaO 48.0～51.0%, Al
2O
33.0 Na～6.0%,
2O 0.5～1.5%, F
-6.0～8.0%, MgO 1.0～2.0%, Fe
2O
30.5～1.0%, C 1.5～2.0%.
In order to guarantee that this covering slag is good to lubricating of strand, has the heat-transfer capability between crystallization control device and strand concurrently, described covering slag dual alkalinity CaO/SiO simultaneously
2Be 1.65～1.75.
Described clinker, wollastonite, fluorite, sodium carbonate, lithium carbonate, calcium hydroxide, refining ground-slag, carbon black, its weight percentage preferably is respectively 9%, 48%, 14%, 2%, 10%, 6%, 9%, 2%.
Covering slag raw material of the present invention is the raw material of industry, and main component (percentage by weight) requires as follows:
Clinker: CaO 62.0～64.0%, SiO
219.0～21.0%;
Wollastonite: CaO 45.0～46.0%, SiO
251.0～52.0%;
Fluorite: CaF
290.0～91.0%;
Sodium carbonate: Na
2CO
398.0～99.0%;
Lithium carbonate: Li
2CO
398.0～99.0%;
Calcium hydroxide: CaO 66.0～67.0%;
Refining ground-slag: CaO 50.0～53.0%, Al
2O
339.0～42.0%;
Carbon black: C 96.0～98.0%.
Except that carbon black, sodium carbonate and lithium carbonate, above-mentioned raw material also carry and are not more than 2% MgO and 1% Fe
2O
3
The granularity of clinker of the present invention, wollastonite, fluorite, sodium carbonate, lithium carbonate, calcium hydroxide, refining ground-slag, carbon black is all less than 250 orders.
Covering slag physical property of the present invention determines to have lower fusing point, setting temperature and short crystallization incubation time.Specific requirement is: hemisphere point fusion temperature is 1080～1110 ℃; 1300 ℃ viscosity is 0.06～0.09PaS; Setting temperature is 1130～1150 ℃ (temperature-viscosity curve judgements); 20～25 seconds crystallization incubation times (heat wire method test).
The preparation method of covering slag of the present invention is: raw material preparation → batching → stirring and evenly mixing → water mill pulping → mist projection granulating → finished product packing, wherein mixing stirs and each 60 minutes water mill pulping time.
Beneficial effect of the present invention: the present invention pours into a mould on certain enterprise's Wide and Thick Slab billet continuous casting machine and contains manganese low-alloy peritectic steel, cast section 220～300mm * 1200～2300mm, the slag consumption when pulling rate is 0.7～1.1m/min is 0.48～0.52kg/T steel, molten steel surface liquid slag layer thickness 7～11mm.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; Steel slab surface longitudinal crack incidence obviously reduces, by 17.4% reducing to below 3.0% before.
Description of drawings
Fig. 1 is the schematic diagram that concerns between covering slag setting temperature and surface longitudinal crack of slab and the bonding steel leakage;
Fig. 2 a is existing covering slag slag membrane structure schematic diagram;
Fig. 2 b is a covering slag slag membrane structure schematic diagram of the present invention.
Among the figure: 1 hot-fluid and wide lobe, 2 frictional force and bonding steel leakage, 3 crystallizers, 4 solidified shells, 5 existing melt cinder films, 6 have solid slag films, 7 melt cinder films of the present invention, 8 solid slag films of the present invention, 9 meniscus surface areas now.
The specific embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
Referring to Fig. 1, Fig. 2 a; will reduce the heat-transfer capability of covering slag in crystallizer according to existing theory just means and will suitably improve the covering slag setting temperature; increase the thickness of existing covering slag solid slag film 6, dwindle the thickness of existing covering slag melt cinder film 5, this will influence lubricant effect.The high covering slag of percent crystallization in massecuite in general, often setting temperature is also high.The covering slag that setting temperature is high not only increases the frictional force that existing covering slag solid slag film 6 contacts with crystallizer 3, and the increase of the shearing force of existing covering slag melt cinder film 5, thereby slag film lubricated had very big destruction.Therefore, in tradition research,, be difficult to take into account simultaneously the lubricated of covering slag and control heat problem for the steel grade of crackle sensitivity.
Want to find and can reduce heat transfer, can guarantee the zone of lubricating again, the principle that the preparation of covering slag is adopted be lower setting temperature, high percent crystallization in massecuite (the crystallization incubation time of lacking).
Covering slag of the present invention has embodied two main features, promptly lower setting temperature and high crystalline rate.Referring to Fig. 2 b; rapid crystallization (generally representing with the incubation time) can impel the covering slag solid slag film 8 of the present invention at meniscus surface area 9 places by thin thickening; low setting temperature can make covering slag melt cinder film 7 of the present invention in crystallizer 3 exits by thin thickening; so just can make covering slag solid slag film 8 of the present invention and liquid slag film 7 on whole crystallizer 3 short transverses, become more even; both controlled the heat transfer at meniscus place, guaranteed lubricated again.
Covering slag of the present invention has adopted high Li
2O content 4.0～5.0% and high basicity CaO/SiO
2Be 1.65～1.75.Utilize high Li
2O content guarantees can realize the target of meniscus surface area 9 base shells " slow cooling " in the crystallizer 3 at meniscus surface area 9 place's rapid crystallizations under high basicity, reaches the purpose that reduces surface longitudinal crack of slab.
Embodiment 1:
Covering slag chemical analysis weight percentage is: CaO 50.4%, SiO
230.0%, Li
2O4.6%, Na
2O 0.8%, F
-6.7%, MgO 1.3%, Al
2O
33.9%, Fe
2O
30.5%, C 1.8%.Covering slag physical property: 1093 ℃ of fusing points, 1300 ℃ viscosity 0.076PaS, 1142 ℃ of setting temperatures, 22 seconds crystallization incubation times.
Embodiment 2:
Covering slag chemical analysis weight percentage is: CaO 49.1%, SiO
228.9%, Li
2O4.9%, Na
2O 0.6%, F
-7.1%, MgO 1.6%, Al
2O
35.5%, Fe
2O
30.6%, C 1.7%.Covering slag physical property: 1084 ℃ of fusing points, 1300 ℃ viscosity 0.068PaS, 1133 ℃ of setting temperatures, 21 seconds crystallization incubation times.
Embodiment 3:
Covering slag chemical analysis weight percentage is: CaO 50.5%, SiO
229.0%, Li
2O4.1%, Na
2O 0.9%, F
-6.9%, MgO 1.2%, Al
2O
34.9%, Fe
2O
30.7%, C 1.8%.Covering slag physical property: 1107 ℃ of fusing points, 1300 ℃ viscosity 0.072PaS, 1147 ℃ of setting temperatures, 24 seconds crystallization incubation times.
Embodiment 4:
Covering slag chemical analysis weight percentage is: CaO 48.1%, SiO
229.0%, Li
2O4.4%, Na
2O 1.2%, F
-7.2%, MgO 1.7%, Al
2O
35.7%, Fe
2O
30.9%, C 1.8%.Covering slag physical property: 1087 ℃ of fusing points, 1300 ℃ viscosity 0.087PaS, 1137 ℃ of setting temperatures, 23 seconds crystallization incubation times.
Embodiment 5:
Covering slag chemical analysis weight percentage is: CaO 49.0%, SiO
228.8%, Li
2O4.5%, Na
2O 1.0%, F
-6.9%, MgO 1.6%, Al
2O
35.6%, Fe
2O
30.9%, C 1.7%.Covering slag physical property: 1090 ℃ of fusing points, 1300 ℃ viscosity 0.078PaS, 1135 ℃ of setting temperatures, 23 seconds crystallization incubation times.
Embodiment 6:
Covering slag chemical analysis weight percentage is: CaO 50.0%, SiO
229.4%, Li
2O4.3%, Na
2O 1.2%, F
-7.0%, MgO 1.5%, Al
2O
34.3%, Fe
2O
30.5%, C 1.8%.Covering slag physical property: 1096 ℃ of fusing points, 1300 ℃ viscosity 0.073PaS, 1142 ℃ of setting temperatures, 24 seconds crystallization incubation times.
Embodiment 1～6 pours into a mould on certain enterprise's Wide and Thick Slab billet continuous casting machine and contains manganese low-alloy peritectic steel, cast section 220～300mm * 1200～2300mm, the slag consumption when pulling rate is 0.7～1.1m/min is 0.48～0.52kg/T steel, molten steel surface liquid slag layer thickness 7～11mm.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; Steel slab surface longitudinal crack incidence obviously reduces, by 17.4% reducing to below 3.0% before.
Claims (6)
1. Wide and Thick Slab continuous casting containing manganses low-alloy peritectic steel crystallizer covering slag; comprise clinker, wollastonite, fluorite, sodium carbonate, lithium carbonate, calcium hydroxide, refining ground-slag, carbon black, it is characterized in that the percentage by weight of chemical composition in the described covering slag is: Li
2O 4.0～5.0%, SiO
228.0～31.0%, CaO 48.0～51.0%, Al
2O
33.0 Na～6.0%,
2O 0.5～1.5%, F-6.0～8.0%, MgO 1.0～2.0%, Fe
2O
30.5～1.0%, C 1.5～2.0%.
2. Wide and Thick Slab continuous casting containing manganses low-alloy peritectic steel crystallizer covering slag as claimed in claim 1 is characterized in that described covering slag dual alkalinity CaO/SiO
2Be 1.65～1.75.
3. Wide and Thick Slab continuous casting containing manganses low-alloy peritectic steel crystallizer covering slag as claimed in claim 1 or 2; it is characterized in that described clinker, wollastonite, fluorite, sodium carbonate, lithium carbonate, calcium hydroxide, refining ground-slag, carbon black, its percentage by weight is respectively 9%, 48%, 14%, 2%, 10%, 6%, 9%, 2%.
4. Wide and Thick Slab continuous casting containing manganses low-alloy peritectic steel crystallizer covering slag as claimed in claim 1, the granularity that it is characterized in that described clinker, wollastonite, fluorite, sodium carbonate, lithium carbonate, calcium hydroxide, refining ground-slag, carbon black is all less than 250 orders.
5. Wide and Thick Slab continuous casting containing manganses low-alloy peritectic steel crystallizer covering slag as claimed in claim 3, the granularity that it is characterized in that described clinker, wollastonite, fluorite, sodium carbonate, lithium carbonate, calcium hydroxide, refining ground-slag, carbon black is all less than 250 orders.
6. Wide and Thick Slab continuous casting containing manganses low-alloy peritectic steel crystallizer covering slag as claimed in claim 1, it is characterized in that described covering slag physicochemical property is: hemisphere point fusion temperature is 1080～1110 ℃; Viscosity under 1300 ℃ is 0.06～0.09PaS; Setting temperature is 1130～1150 ℃; 20～25 seconds crystallization incubation times.
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|---|---|---|---|
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100521686A CN101898232B (en) | 2009-05-27 | 2009-05-27 | Mould powder for manganese-containing low content alloy peritectic steel subjected to continuous casting by thick slab caster |
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| CN101898232B CN101898232B (en) | 2012-04-25 |
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| CN102233411A (en) * | 2011-06-27 | 2011-11-09 | 河南通宇冶材集团有限公司 | Low-alkalinity crystallizer covering slag prepared from building waste clay |
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| CN102248141A (en) * | 2011-06-27 | 2011-11-23 | 河南通宇冶材集团有限公司 | High-alkalinity mould flux used for niobium/vanadium/titanium-containing low alloy wide and heavy plate blank and manufacturing method thereof |
| CN102248141B (en) * | 2011-06-27 | 2013-08-21 | 河南通宇冶材集团有限公司 | High-alkalinity mould flux used for niobium/vanadium/titanium-containing low alloy wide and heavy plate blank and manufacturing method thereof |
| CN102233411B (en) * | 2011-06-27 | 2013-08-21 | 河南通宇冶材集团有限公司 | Low-alkalinity crystallizer covering slag prepared from building waste clay |
| CN102233411A (en) * | 2011-06-27 | 2011-11-09 | 河南通宇冶材集团有限公司 | Low-alkalinity crystallizer covering slag prepared from building waste clay |
| CN104148603A (en) * | 2013-05-14 | 2014-11-19 | 宝山钢铁股份有限公司 | Continuous-casting protection slag for CAS treated ship plate structural steel |
| CN103611903A (en) * | 2013-12-11 | 2014-03-05 | 首钢总公司 | Continuous casting manufacturing process of ultra-thick slabs for hydropower station pressure vessel steel |
| CN104707959A (en) * | 2013-12-11 | 2015-06-17 | 宝山钢铁股份有限公司 | Continuous casting mold flux for automobile sheet |
| CN103801666A (en) * | 2014-02-24 | 2014-05-21 | 江苏苏南重工机械科技有限公司 | High-performance heat-preservation covering agent for thick slab and preparing method of high-performance heat-preservation covering agent |
| CN103801666B (en) * | 2014-02-24 | 2015-12-02 | 江苏苏南重工机械科技有限公司 | A kind of wide and thick slab high-performance thermal-insulating covering agent and preparation method thereof |
| CN103785807A (en) * | 2014-02-27 | 2014-05-14 | 西峡龙成冶金材料有限公司 | Ultrahigh-alkalinity crystallizer mould flux special for high-pulling-rate peritectic steel |
| CN103785807B (en) * | 2014-02-27 | 2016-03-02 | 西峡龙成冶金材料有限公司 | The special superhigh-alkalinity crystallizer protecting residue of a kind of high pulling rate peritectic steel |
| CN103990770A (en) * | 2014-05-15 | 2014-08-20 | 攀钢集团攀枝花钢铁研究院有限公司 | High-alkalinity high-lubricity continuous casting crystallizer casting powder and method for performing continuous casting on peritectic steel slab |
| CN106475536A (en) * | 2016-12-30 | 2017-03-08 | 河南省西保冶材集团有限公司 | A kind of P91 jet chimney steel continuous crystallizer protecting slag and preparation method thereof |
| CN106475536B (en) * | 2016-12-30 | 2018-11-13 | 河南省西保冶材集团有限公司 | A kind of P91 jet chimneys steel continuous crystallizer protecting slag and preparation method thereof |
| CN113399631A (en) * | 2021-06-17 | 2021-09-17 | 东北大学 | High-pulling-speed peritectic steel slab continuous casting covering slag and application thereof |
| CN115351252A (en) * | 2022-09-28 | 2022-11-18 | 河南通宇冶材集团有限公司 | Casting slag capable of reducing casting defects of slab continuous casting and preparation method thereof |
| CN115351252B (en) * | 2022-09-28 | 2024-04-16 | 河南通宇冶材集团有限公司 | Casting slag for reducing slab continuous casting defect and preparation method thereof |
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