CN102728797A - Crystallizer protective slag for effectively controlling carbon steel cracks in compact strip production (CSP) - Google Patents
Crystallizer protective slag for effectively controlling carbon steel cracks in compact strip production (CSP) Download PDFInfo
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- CN102728797A CN102728797A CN2012101981918A CN201210198191A CN102728797A CN 102728797 A CN102728797 A CN 102728797A CN 2012101981918 A CN2012101981918 A CN 2012101981918A CN 201210198191 A CN201210198191 A CN 201210198191A CN 102728797 A CN102728797 A CN 102728797A
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Abstract
The invention discloses crystallizer protective slag for effectively controlling carbon steel cracks in a compact strip production (CSP). The crystallizer protective slag comprises the following chemical components in percentage by mass: 35 to 38 percent of CaO, 28 to 31 percent of SiO2, 1 to 3 percent of Al2O3, 1 to 2 percent of MgO, 0.5 to 1.5 percent of Fe2O3, 10 to 11.5 percent of F, 9 to 11.5 percent of Na2O, 1.5 to 3.5 percent of MnO, 5 to 8 percent of fixed carbon, and the balance of inevitable trace elements. Through the crystallizer protective slag for controlling the carbon steel cracks in the CSP, the alkalinity is improved by 0.04 to 0.09, the alkalinity is controlled to be 1.20 to 1.25, the constraint that the alkalinity cannot be more than 1.16 in the field is broken, the viscosity is controlled to be 0.08 to 0.09Pa.S, and the melting point is from 1,155 to 1,185 DEG C; capabilities of dissolving and absorbing inclusions are improved, and heat transfer is retarded by reducing a vitreous body, so that an aim of reducing longitudinal cracks is fulfilled; and by adjusting the proportioned carbon and controlling the thickness of a liquid slag layer, bonding steel leakage caused by high crystallization temperature and deteriorated lubricating performance due to over high alkalinity of the protective slag is relieved.
Description
Technical field
The present invention relates to make steel, be applicable in the continuous casting technology crystallizer protecting residue of sheet blank continuous casting crackle control, specifically refer to a kind of crystallizer protecting residue of effective control CSP medium carbon steel crackle.
Background technology
CSP technology is owing to characteristics such as its distinctive funnel type crystallizer, sheet billet, high pulling rate, crystallizer intensity of cooling height and specific area are big; Compare with sheet billet continuous casting; The casting condition that sheet blank continuous casting faces is very strict and harsh, brings big difficulty to improving the operation of slab quality and stabilizing continuous casting.The influence that each characteristic caused that CSP sheet blank continuous casting technology is appeared all has direct relation with covering slag.In recent years, the slab quality accident and the crystallizer bleed-out accident that cause owing to the covering slag reason frequently took place, and had had a strong impact on the direct motion that CSP produces.
The thin plate blanket continuous casting protective slag and the manufacturing approach of the invention of CN1060050A Iron and Steel Research Geueral Inst, its composition is by weight percentage: CaO30 ~ 35%, SiO
228 ~ 35 %, Na
2O5 ~ 10%, F
-7 ~ 10%, B
2O
33 ~ 8%, C2.7 ~ 3.5 %, Al
2O
3 3%, MgO1.5 ~ 2.0 %, MnO 2 ~ 3.5%, Fe
2O
3 
3 %, H
2O
0.5%.Its dual alkalinity CaO/SiO
2Viscosity when (weight ratio) is 0.99 ~ 1.16,1300 ℃ is 0.3 ~ 0.75 pool, and softening temperature is 970 ~ 1000 ℃, and melt temperature is 1050 ~ 1080 ℃.This slag system burn-off rate soon, fusing is even, slag consumes the 0.3kg/t steel, even, the lubricated high insulating effect that reaches of conducting heat, and casting billet surface is smooth bright and clean, and surface quality is good.
CN1528546A Xixia Longcheng Metallurgical Equipments & Material Group Company Ltd., continuous-casting crystallizer especially used covering slag of the slim slab of invention and production technology thereof, its composition percentage by weight is: CaO26 ~ 33%, SiO
228 ~ 35%, Fe
2O
3 
1.5%, MgO3 ~ 6%, Al
2O
33 ~ 6%, R
2O (Na
2O+K
2O+Li
2O) 9 ~ 12%, F
-4 ~ 7%, MnO 1 ~ 4%, H
2O
0.5%.B
2O
33~8%、C2.7~3.5?%。Dual alkalinity (CaO/ SiO
2) be 0.95 ± 0.06, softening temperature Ts is 1020 ± 20 ℃, and hemispherical fusion temperature Tm is 1040 ± 20 ℃, and recrystallization temperature Tc is 1100 ± 20 ℃, and crystallization rate Rp is 0 ~ 15%.This invention proposes sheet billet privacy protection slag and designs a model: lower fusing point, and hemispherical fusion temperature is controlled at 1040 ± 20 ℃ usually; Lower viscosity, in order to ensure suitable slag consumption, viscosity Control is at 0.13 ± 0.05PaS, 1300 ℃; Medium recrystallization temperature and lower crystallization rate, general recrystallization temperature is controlled at 1095 ± 20 ℃, and the crystallization rate is controlled at 0 ~ 15%; Bigger slag interface tension force, interfacial tension is controlled at greater than 290 dyne usually.Rely on the high Li of crystallization rate under the cryogenic conditions
2O reduces heat flow density, prevents the generation of crackle.
A kind of low-carbon steel protecting slag for continuous casting of sheet billet and the preparation method of the invention of CN1927502A Tangshan Iron & Steel Co., Ltd. are used to solve FTSC conticaster production mild steel and casting billet surface lobe or adhesion problem occur.Be that its chemical component weight percentage is: SiO
228 ~ 32%, CaO29 ~ 33%, Al
2O
33 ~ 5%, MgO1 ~ 3%, Fe
2O
3≤3%, F
-7 ~ 9%, (Na
2O+K
2O) 9 ~ 12%, Li
2O≤2.0%, fixed carbon 7, binding agent 1 ~ 3%, mechanical water≤0.5%.Dual alkalinity R (CaO/SiO
2) be 1.00+0.05, the viscosity in the time of 1300 ℃ is 0.15 ~ 0.05PaS, and fusing point is 1070 ± 20 ℃, and recrystallization temperature is 1135 ± 15 ℃, and the crystallization ratio is 10 ± 5%, unit weight is 0.65 ± 0.15g/cm3.This invents the slag film control target that said covering slag has been realized low recrystallization temperature, high setting temperature and higher crystallization ratio.Its result of use has surpassed domestic and international colleague's product, satisfies the requirement of FTSC sheet blank continuous casting mild steel fully.
The CSP crystallizer for continuous casting of thin slabs covering slag of CN1411931A Zhujiang Iron and Steel Co Ltd, Guangzhou invention; Overcoming prior art slag consumption from sheet blank continuous casting process sharply descends; Cause the insufficient lubrication and the inequality of conducting heat, cause bonding steel leakage and cc billet surface quality poor.The present invention on the basis of conventional flux with addition of Li
2Flux such as O, BaO, MgO are realized the requirement of sheet blank continuous casting; Li
2O, BaO, MgO weight percent content be respectively 1.0 ~ 2.5%, 9% with interior, 3.0 ~ 6.0%.Its fusing point, Q235B, 16Mn slag adopt high-melting-point (1060 ℃), high basicity (0.9 ~ 1.1), low viscosity (1.0 ~ 1.6 pool), the Q195 slag adopts low melting point (1000 ℃), low basicity (0.78 ~ 0.86), high viscosity (1.5 ~ 2.0 pool); It is good to have spreadability, fusing property, heat insulating ability, and narrow surface residue membrane forms, the heat transfer flux good stability, and glass property is good, prevents sticker type breakout, the rare slag inclusion of casting billet surface, wraps up in the slag phenomenon, makes smoothly light of surface of steel plate.
Adopt low basicity, high viscosity scheme for sheet billet mild steel with covering slag at present both at home and abroad, and sheet billet medium carbon steel covering slag adopts high basicity (less than 1.16), low viscosity scheme.Adopting the higher alkalisation covering slag, is in order to improve the ability of its dissolving, absorbing foreign matter, and reaches and slow down heat transfer through reducing vitreum, thereby reaches the purpose that reduces longitudinal crack.But covering slag basicity is too high, causes recrystallization temperature high, is prone to worsen the lubricated of base shell, causes base shell bonding steel leakage.
Summary of the invention
The present invention provides a kind of crystallizer protecting residue of effective control CSP medium carbon steel crackle, the dual alkalinity (CaO/SiO of this covering slag
2) viscosity is 0.08 ~ 0.09PaS when being 1.20 ~ 1.25,1300 ℃, can effectively prevent bonding steel leakage and strand crackle.
Technical scheme of the present invention is following:
OnePlant the effectively crystallizer protecting residue of control CSP medium carbon steel crackle, the mass fraction of its chemical composition is CaO35 ~ 38%, SiO
228 ~ 31 %, Al
2O
31 ~ 3%, MgO1 ~ 2 %, Fe
2O
30.5 F ~ 1.5%,
-10 ~ 11.5%, Na
2O9 ~ 11.5%, MnO1.5 ~ 3.5%, fixed carbon 5 ~ 8 %, all the other are inevitably micro-.
The present invention gets through existing covering slag is carried out continual optimization; Be control CSP medium carbon steel crackle; Basicity has been improved 0.04～0.09, and basicity is controlled at 1.20～1.25, has broken and has thought in this area that basicity can not exceed 1.16 constraint; And with viscosity Control at 0.08 ~ 0.09PaS, fusing point is 1155 ~ 1185 ℃; The ability of its dissolving, absorbing foreign matter is improved, and reach and slow down heat transfer, thereby reach the purpose that reduces longitudinal crack through reducing vitreum; And join carbon through adjustment, control liquid slag layer thickness is alleviated too highly because of covering slag basicity, causes that recrystallization temperature is high, the greasy property deterioration, the bonding steel leakage that causes.
Principle analysis of the present invention: adopt carbonaceous materials such as graphite and carbon black,, can stop the gathering of covering slag drop effectively, thereby control covering slag burn-off rate, regulator solution thickness of slag layer because of it has very high fusing point.
The present invention adopts higher melt to increase the thermal resistance of protection slag blanket; High basicity (1.20 ~ 1.25) improves dissolving, absorbs the speed of steel inclusion, improves the heat transfer that its crystallization rate reduces covering slag, and after this covering slag used, wide heat flow density of crystallizer was 2.2 ~ 2.4MW/m
2, the leptoprosopy heat flow density is 1.8 ~ 2.0 MW/m
2, the hot-fluid ratio is controlled at 75 ~ 95%.
The present invention has increased the amount of CaO, and CaO belongs to network modifying oxide, can improve covering slag basicity, obviously reduces covering slag viscosity, and favourable to absorbing oxide inclusions.But the viscosity with temperature of basic slag changes greatly, when being cooled to liquidus temperature, because crystallizing power is then constantly separated out crystal by force, and the glass property of meeting heavy damage slag.
Thin brilliant characteristic when the present invention utilizes the MnO crystallization, existing lubricity preferably can suppress again to conduct heat; Its slag film is brownish red, and transmission has certain refraction action to heat, thereby has weakened the heat flow density of crystallizer, is beneficial to control and conducts heat.
The present invention has improved CaF
2And Na
2The amount of O is prone to cause cuspidine (3CaO2SiO2CaF
2) and nepheline (Na
2OAl
2O
32SiO
2) wait separating out of high-melting-point thing, be beneficial to the control of heat transfer property, but destroy the glass property of slag, lubricating condition is worsened.And F
-Ion can impel the silica condensate to disintegrate, thereby reduces viscosity coefficient of dross, has avoided because of F
-Too high levels and the high-melting-point thing that causes is separated out problem; Na
2O belongs to network modifying oxide, can destroy silicate network structure, and the effect of landing low melting glass and viscosity improves greasy property in covering slag.
The present invention has reduced Al
2O
3Content, the viscosity of slag is reduced, be beneficial to the absorption alumina inclusion; Add proper addition of MgO, can make slag when keeping identical viscosities and softening point, increase the flowability of slag, guarantee enough slag consumptions.
The present invention has also considered this factor of surface tension of covering slag, adds an amount of network structure compound S iO
2And Al
2O
3, be beneficial to increase slag-steel interfacial tension, then angle of wetting is more little, and two alternate wetness degrees are more little, and slag is easily separated more, to controlling the lubricated favourable of field trash separation, absorption and slag film.
Comprehensively above-mentioned, the present invention has following beneficial effect:
1, good spreadability, lubricity, fusing property and heat insulating ability, the ability that has good absorption to be mingled with;
2, viscosity is suitable, recrystallization temperature is reasonable, and liquid slag layer thickness is reasonable, and the slag film forms evenly, stable, plays importantly to evenly slowly cooling off, and heat flow density is reasonable, and the strand crackle obviously reduces;
3, the volume slag defective that causes of liquid level fluctuation of crystallizer obviously reduces, and slab quality is good, and the strand crackle is effectively controlled.
The specific embodiment
Embodiment 1
Covering slag chemical composition (mass fraction) is CaO35.85%, SiO
229.60%, Al
2O
32.09%, MgO1.32 %, Fe
2O
30.91%, F
-11.23%, Na
2O9.54%, MnO2.98%, fixed carbon 6.31 %; Physical property is: viscosity 0.085PaS, basicity 1.21,1180 ℃ of fusing points.Use this covering slag casting medium carbon steel, cross dimensions is 1500 * 70/52mm, pulling rate 4.9m/min, and the PLC1# cooling curve, lubricated better with heat transfer property control, wide heat flow density of crystallizer is 2.4 ~ 2.5MW/m
2, the leptoprosopy heat flow density is 2.0 ~ 2.1MW/m
2, the hot-fluid ratio is controlled at 80 ~ 87%, and the slag bar forms evenly, melt cinder bed thickness 7mm, the slag consumption is the 0.45kg/t steel, medium carbon steel crackle rate reduces to 0.53% by original 1.23%.
Embodiment 2
The mass fraction of chemical composition is CaO36.53% in the covering slag, SiO
229.25%, Al
2O
31.96%, MgO1.15 %, Fe
2O
30.98%, F
-10.97%, Na
2O9.23%, MnO3.01%, fixed carbon 5.54%.Physical property is following: viscosity 0.089PaS, basicity 1.25,1185 ℃ of fusing points.Use this covering slag casting medium carbon steel, cross dimensions is 1500 * 70mm, pulling rate 3.8m/min, and the DSC5# cooling curve, wide heat flow density of crystallizer is 2.2 ~ 2.3MW/m
2, the leptoprosopy heat flow density is 1.7 ~ 1.8 MW/m
2, the hot-fluid ratio is controlled at 74 ~ 82%.The slag bar forms evenly, and lubricity is good, melt cinder bed thickness 8mm, and the slag consumption is 0.47 kg/t steel, medium carbon steel crackle rate reduces to 0.43% by original 1.23%.
Embodiment 3
The mass fraction of chemical composition is CaO37.02% in the covering slag, SiO
230.09%, Al
2O
31.67%, MgO1.02 %, Fe
2O
30.87%, F
-11.06%, Na
2O9.26%, MnO1.93%, fixed carbon 7.65%.Physical property is following: viscosity 0.09PaS, basicity 1.23,1169 ℃ of fusing points.Use this covering slag casting medium carbon steel, cross dimensions is 1250 * 70/60mm, pulling rate 4.7m/min, and the PLC2# cooling curve, wide heat flow density of crystallizer is 2.2 ~ 2.3MW/m
2, the leptoprosopy heat flow density is 1.8 ~ 1.9MW/m
2, the hot-fluid ratio is controlled at 82 ~ 86%.The slag bar forms evenly, and lubricity is good, melt cinder bed thickness 7mm, and the slag consumption is the 0.45kg/t steel, medium carbon steel crackle rate reduces to 0.45% by original 1.23%.
Production technology of the present invention:
1) base-material adopts CaO-SiO
2-Al
2O
3Ternary system is got materials such as the wollastonite in powder that accounts for gross weight 80～85%, glass dust, clinker, calcite, magnesia, aluminium vanadine, olive sand, quartz sand, albite, and is broken, levigate respectively, and its particle diameter is reached below 40 microns, and processing powder, to go into feed bin for use;
2) in agitator, add suitable quantity of water; At first add 10～15% auxiliary agent fluorites, sodium carbonate, sodium fluoride, manganese carbonate, ice crystal etc.; Dissolving the back, to add required carbonaceous material be that carbon black and graphite stir in advance, and then add in the required step 1) levigately to the various raw material below 40 microns, adds required 0.8～1.8% sodium carboxymethylcellulose or starch and 2～3.5% calcium lignosulfonates at last; Stir; Require pulp density to be controlled at 50 ~ 60%, granulation in the mist projection granulating tower then, the tower temperature control is at 400 ℃ ~ 450 ℃;
3) covering slag of drying and moulding is cooled in storage bin below 100 ℃ after the granulation, granularity requirements: 0-0.2mm, the wherein above particle diameter of 0.17mm more than 80%; Packing moisture content≤0.30%.
Claims (1)
1. a crystallizer protecting residue of effectively controlling CSP medium carbon steel crackle is characterized in that the mass fraction of its chemical composition is CaO35 ~ 38%, SiO
228 ~ 31 %, Al
2O
31 ~ 3%, MgO1 ~ 2 %, Fe
2O
30.5 F ~ 1.5%,
-10 ~ 11.5%, Na
2O9 ~ 11.5%, MnO1.5 ~ 3.5%, fixed carbon 5 ~ 8 %, all the other are inevitably micro-.
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|---|---|---|---|
| CN2012101981918A CN102728797A (en) | 2012-06-15 | 2012-06-15 | Crystallizer protective slag for effectively controlling carbon steel cracks in compact strip production (CSP) |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101981918A CN102728797A (en) | 2012-06-15 | 2012-06-15 | Crystallizer protective slag for effectively controlling carbon steel cracks in compact strip production (CSP) |
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|---|---|
| CN102728797A true CN102728797A (en) | 2012-10-17 |
Family
ID=46985489
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Cited By (13)
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|---|---|---|---|---|
| CN105772652A (en) * | 2016-03-23 | 2016-07-20 | 河南省西保冶材集团有限公司 | Special cleaner for molten iron ladle furnace liner and using method thereof |
| 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 |
| CN106583673A (en) * | 2016-12-16 | 2017-04-26 | 河南通宇冶材集团有限公司 | Continuous-casting mold flux for decreasing sticking steel breakouts and preparation method thereof |
| CN106694833A (en) * | 2016-12-28 | 2017-05-24 | 西峡龙成冶金材料有限公司 | Crystallizer covering slag special for CSP thin slab continuous casting medium carbon steel |
| CN107671250A (en) * | 2017-08-29 | 2018-02-09 | 东北大学 | A kind of ocean platform medium managese steel continuous casting covering slag |
| CN107931552A (en) * | 2017-12-28 | 2018-04-20 | 西峡龙成冶金材料有限公司 | The continuous-casting crystallizer especially used covering slag of ESP medium carbon steel |
| CN108568501A (en) * | 2018-04-27 | 2018-09-25 | 西峡县西保冶金材料有限公司 | A kind of pile for prestressed pipe steel continuous crystallizer protecting slag |
| CN108856666A (en) * | 2018-07-05 | 2018-11-23 | 江苏理工学院 | Stainless steel continuous casting covering slag and preparation method thereof |
| CN109794589A (en) * | 2019-01-09 | 2019-05-24 | 邯郸钢铁集团有限责任公司 | A kind of process control method preventing CSP continuous casting billet lobe defect |
| CN109822071A (en) * | 2019-01-09 | 2019-05-31 | 邯郸钢铁集团有限责任公司 | Prevent CSP conticaster and opens the process control method for pouring bleed-out |
| CN109894588A (en) * | 2019-04-18 | 2019-06-18 | 洛阳市科丰冶金新材料（集团）有限公司 | One kind is completely without head high efficiency continuous casting ESP mild steel mould flux and preparation method thereof |
| CN111036868A (en) * | 2019-11-19 | 2020-04-21 | 中南大学 | Application of covering slag in high-pulling-speed continuous casting peritectic steel |
| 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 |
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| CN105772652A (en) * | 2016-03-23 | 2016-07-20 | 河南省西保冶材集团有限公司 | Special cleaner for molten iron ladle furnace liner and using method thereof |
| CN106583673A (en) * | 2016-12-16 | 2017-04-26 | 河南通宇冶材集团有限公司 | Continuous-casting mold flux for decreasing sticking steel breakouts and preparation method thereof |
| CN106694833A (en) * | 2016-12-28 | 2017-05-24 | 西峡龙成冶金材料有限公司 | Crystallizer covering slag special for CSP thin slab continuous casting medium carbon steel |
| 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 |
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| CN107671250A (en) * | 2017-08-29 | 2018-02-09 | 东北大学 | A kind of ocean platform medium managese steel continuous casting covering slag |
| CN107931552B (en) * | 2017-12-28 | 2019-12-03 | 西峡龙成冶金材料有限公司 | The continuous-casting crystallizer especially used covering slag of ESP medium carbon steel |
| CN107931552A (en) * | 2017-12-28 | 2018-04-20 | 西峡龙成冶金材料有限公司 | The continuous-casting crystallizer especially used covering slag of ESP medium carbon steel |
| CN108568501A (en) * | 2018-04-27 | 2018-09-25 | 西峡县西保冶金材料有限公司 | A kind of pile for prestressed pipe steel continuous crystallizer protecting slag |
| CN108856666A (en) * | 2018-07-05 | 2018-11-23 | 江苏理工学院 | Stainless steel continuous casting covering slag and preparation method thereof |
| CN108856666B (en) * | 2018-07-05 | 2020-08-21 | 江苏理工学院 | Continuous casting covering slag for stainless steel and preparation method thereof |
| CN109822071A (en) * | 2019-01-09 | 2019-05-31 | 邯郸钢铁集团有限责任公司 | Prevent CSP conticaster and opens the process control method for pouring bleed-out |
| CN109794589A (en) * | 2019-01-09 | 2019-05-24 | 邯郸钢铁集团有限责任公司 | A kind of process control method preventing CSP continuous casting billet lobe defect |
| CN109894588A (en) * | 2019-04-18 | 2019-06-18 | 洛阳市科丰冶金新材料（集团）有限公司 | One kind is completely without head high efficiency continuous casting ESP mild steel mould flux and preparation method thereof |
| CN109894588B (en) * | 2019-04-18 | 2021-06-22 | 洛阳市科丰冶金新材料（集团）有限公司 | Special all-endless high-efficiency continuous casting protective slag for ESP (electronic stability program) low-carbon steel and preparation method thereof |
| CN111036868A (en) * | 2019-11-19 | 2020-04-21 | 中南大学 | Application of covering slag in high-pulling-speed continuous casting peritectic steel |
| CN111036868B (en) * | 2019-11-19 | 2022-05-17 | 中南大学 | Application of covering slag in high-pulling-speed continuous casting peritectic steel |
| 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 |
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Application publication date: 20121017 |