CN106493319A - High pulling rate continuous small-billet casting covering slag and preparation method thereof - Google Patents
High pulling rate continuous small-billet casting covering slag and preparation method thereof Download PDFInfo
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- CN106493319A CN106493319A CN201610946639.8A CN201610946639A CN106493319A CN 106493319 A CN106493319 A CN 106493319A CN 201610946639 A CN201610946639 A CN 201610946639A CN 106493319 A CN106493319 A CN 106493319A
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- covering slag
- sio
- pulling rate
- slag
- high pulling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
Abstract
The present invention relates to a kind of high pulling rate continuous small-billet casting covering slag and preparation method thereof, by weight percentage, chemical composition includes：28%≤CaO≤38%, 23%≤SiO2≤ 43%, 0%≤Al2O3≤ 10%, MgO≤3%, Fe2O3≤ 2%, 5%≤F≤7%, 6≤Na2O≤9%, 0%≤Li2O≤3%, 0%≤BaO≤15%, B2O3≤ 5%, 2%≤C≤10%, remaining are impurity；Basicity CaO/SiO2For 0.65 ~ 1.6；Fusing point is 850 ~ 1120 DEG C, and 1300 DEG C of viscositys are 0.05 ~ 0.35 Pa.s.The present invention is prevented from covering slag and is involved in molten steel, while covering slag burn-off rate is fast relative to traditional slag system; slag consumption is suitable; good lubrication strand and Heat Transfer Control characteristic is can guarantee that, slab surface crack defect can be reduced and prevented bleed-out accident, it is ensured that casting process direct motion.
Description
Technical field
The present invention relates to a kind of high pulling rate continuous small-billet casting covering slag and preparation method thereof, it is adaptable to which pulling rate is 4 ~ 6 m/
Min, section≤200 × 200 mm2The high pulling rate continuous small-billet casting production of steel grade, belongs to continuous casting technical field.
Background technology
With the further development of high-efficient continuous casting technology, some steel grades increase yield while reducing producing to improve pulling rate
Cost.In casting cycle, as pulling rate is higher, the steel liquid fluctuating in crystallizer aggravates high pulling rate small billet, easily causes
Slag, deteriorates cc billet surface quality.Simultaneously as covering slag consumption reduces, between crystallizer and green shell, flux film stablizes
Property and uniformity decline, cause that Billet is uneven, frictional resistance increases, be easily caused the production accidents such as bonding steel leakage and casting
The defects such as base face crack, the direct motion and steel for affecting casting process roll the unobstructed of interface.Above-mentioned high speed billet continuous casting process feature
The coordination control of the various performances of covering slag is put forward higher requirement.For example, in order to increase consumption, relatively low covering slag is needed
Viscosity, but viscosity is too low, is easily caused strand depth oscillation mark, and while pulling rate is high, the low slag that is easier of viscosity causes casting blank defect；Right
The sensitive middle low carbon steel of partial crack, pulling rate improve and heat flow density are increased, and green shell uniformity is deteriorated, and covering slag needs higher
Solidification temperature carry out uniform control heat transfer of the strand to crystallizer, but solidification temperature is too high, and melt cinder film is partially thin so that consumption
Reduce, cause strand lubrication state to deteriorate.
Traditional crystallizer protecting residue is mainly by CaO and SiO2Composition, the viscosity and solidification for adjusting liquid slag is warm in addition
Degree, can add Al2O3、BaO、Na2O, F and Li2O etc., in addition can also add C etc. for adjusting the burn-off rate of slag.
Reduce the viscosity of covering slag, be a kind of effective method of consumption for improving covering slag.The change meeting of pulling rate
Change the distribution of covering slag, thus, mold flux property must be adapted with casting speed, be otherwise difficult to obtain high-quality
Strand, technique is difficult to.For example, " a kind of square billet continuous casting crystallizer protection disclosed in Chinese patent 201110458736.X
Slag and its production method ", what this invented are technically characterized in that for the high pulling rate square billet of light section, molten steel surface temperature is low, it is desirable to protect
Shield slag slagging speed is fast, and viscosity is less, and wherein chemical analysis include SiO2、MgO、CaO、Fe2O3、Al2O3、Na2O, F, fugitive constituent
And CFixed, its weight/mass percentage composition be respectively 27 ~ 29%, 1.2 ~ 1.7%, 25 ~ 27%,<2%、8.5~10.5%、5.8~6.5%、5.4~
6%、3~5%、16~18%；Physical index：Basicity 0.92-0.96,1135-1175 DEG C of fusing point, 0.45 ~ 0.5 Pa.s of viscosity.This
Bright by viscosity control in the range of 0.45 ~ 0.5 Pa s, 1135-1175 DEG C of fusing point, pulling rate be 3.2 m/s, if pulling rate continue
Increase, then it is difficult to ensure that covering slag consumption and slagging speed, greasy property is poor and is also easy to produce the defects such as crackle.
Covering slag can increase the greasy property of melt cinder under lower basicity, improve crystallizer meniscus melt cinder and flow into condition
And heat transfer property, so as to the generation that can also be reduced crack defect, reduce bleed-out accident.Chinese patent 200910027901.9 is public
" a kind of high-casting speed mold flux " that opens, the invention protection basicity of slag（CaO/SiO2）For 1.15-1.25.When basicity exceedes
When 1.2, crystallize rate increases, while heat flow density reduces.But it is 1142 DEG C which protects slag melting point, under high pulling rate（>4 m/s）,
Mold liquid level is likely to the problems such as causing slag, impact surface defect of bloom, and the patent is not applied to completely for slab
In billet continuous casting covering slag.
Content of the invention
The technical problem to be solved in the present invention is to provide a kind of high pulling rate continuous small-billet casting covering slag and preparation method thereof, should
It is 140 × 140 mm that covering slag is suitable for pulling rate scope for 4 ~ 6m/min, section2~200×200 mm2The continuous casting of steel grade；Protect
Shield slag reduces the fusing point of covering slag accelerates burn-off rate, maintains proper viscosity, keeps rational slag consumption, it is ensured that good
Lubrication strand and Heat Transfer Control characteristic, reduce strand crack defect and prevent bleed-out accident, it is ensured that continuous casting direct motion.
The present invention solves the technical scheme of its technical problem employing：
A kind of high pulling rate continuous small-billet casting covering slag, by weight percentage, chemical composition includes：28%≤CaO≤38%, 23%
≤SiO2≤ 43%, 0%≤Al2O3≤ 10%, MgO≤3%, Fe2O3≤ 2%, 5%≤F≤7%, 6≤Na2O≤9%, 0%≤Li2O≤
3%, 0%≤BaO≤15%, B2O3≤ 5%, 2%≤C≤10%, remaining are impurity；Basicity CaO/SiO2For 0.65 ~ 1.6.
Further, the continuous casting covering slag fusing point is 850 ~ 1120 DEG C, and 1300 DEG C of viscositys are 0.05 ~ 0.35 Pa.s.
Using the present invention of above-mentioned technical proposal, compared with prior art, its advantage is：
The fusing point of the covering slag is relatively low, and viscosity is appropriate, can weaken covering slag in crystallizer and be involved in molten steel；Meanwhile, by viscosity,
The coordination control of fusing point and process of setting viscosity temperature characteristic, can guarantee that good lubrication strand and Heat Transfer Control characteristic, so as to
Reduce strand crack defect and bleed-out accident, it is ensured that continuous casting direct motion.Its mechanism of action and advantage concrete manifestation are as follows：
1）B in the covering slag2O3≤5.B2O3Belong to acidic oxide, be network topology adult, slag Acidity of Aikalinity can be coordinated simultaneously
Adjust covering slag meltdown property and coagulating property.
2）Na2O and Li2O：Na2O is a kind of main flux, low cost, therefore the present invention is by Na2O content control 6 ~
9% scope；Li2O replaces Na2O strengthens the greasy property of melt cinder, high cost, but acts on substantially as flux, and the present invention will
Li2O content is controlled in 0 ~ 3% scope.
3）1300 DEG C of viscositys of the covering slag are 0.05 ~ 0.35 Pa.s, and fusing point is 850 DEG C ~ 1120 DEG C, more general covering slag
Fusing point and viscosity are low.The reduction of viscosity can make covering slag have good lubrication in crystallizer, increase in crystallizer and protect
Shield slag consumption, improves the greasy property of melt cinder, prevents the generation of bleed-out accident in casting process.Reduce fusing point and can improve guarantor
Shield slag melting rate, the slag film of formation are uniform, and equal control conducts heat.
4）Al2O3It is typical amphoteric oxide, belongs to network topology adult in basic clinker.The present invention is by Al2O3
Content is controlled in 0 ~ 10% scope.
5）CaO is the Main Ingredients and Appearance in covering slag, and source is wide, low cost, and will not react with Al in molten steel.But
As CaO is easily combined the dystectic Crystalline Phase of generation with other compositions, cause fusion temperature to raise, therefore CaO is contained by the present invention
Amount control is in 28 ~ 38% scopes.SiO2It is the network topology adult in covering slag, makes covering slag slag form glass phase, with profit
Lubricate in strand.Therefore the present invention is by SiO2Content is controlled in 23 ~ 43% scopes.Covering slag dual alkalinity is 0.65 ~ 1.6, control knot
Brilliant ore deposit is mutually separated out, and improves the heat-transfer character of covering slag.
6）MgO, BaO belong to alkali metal, replace CaO improve the vitrifying degree of slag in covering slag, but due to this three
The fusing point of individual alkali metal itself is higher, and is easily combined the dystectic Crystalline Phase of generation with other compositions, therefore by which in the present invention
Content is controlled as：MgO<3%, 0%<BaO<15%.
7）Fe2O3There is very strong oxidisability, should be by Fe2O3Amount control in relatively low scope, so as to improve covering slag
Anti-aging capability, therefore the present invention is by Fe2O3Content is controlled in 0 ~ 2% scope.
8）F is a kind of main flux, can promote the generation of cuspidine, but under overbasic slag environment, compared with
The CaF of high-load2Can exist with crystal form, so that fusion temperature rises, therefore the present invention controls F contents in 5 ~ 7% models
Enclose.
9）C serves as skeleton in covering slag, can adjust the burn-off rate of covering slag, and the present invention controls C content 2 ~ 10%
Scope.
The preparation method of above-mentioned high pulling rate continuous small-billet casting covering slag, comprises the steps of：
1）Select fluorite, calcite, clinker, brium carbonate, quartz sand, sintered bauxite, lithium carbonate, hydrous borax, soda and
Carbonaceous material is raw material, and the chemical composition of each raw material meets claimed below by weight percentage：
Fluorite：CaF2＞ 90%, SiO2＜ 6.0%, S ＜ 0.05%；
Calcite：CaO50-55%, Al2O3＜ 0.5%, MgO ＜ 2.5%, Fe2O3＜ 0.5%, SiO2＜ 1%；
Clinker：CaO62-68%, SiO220-25%, Al2O3＜ 6%, MgO ＜ 3%, Fe2O3＜ 5%；
Brium carbonate：BaCO3>95%；
Quartz sand：SiO2＞ 95%；
Sintered bauxite：Al2O3>80%, SiO2<8%, MgO ＜ 2.5%, Fe2O3＜ 3%；
Lithium carbonate：Li2CO3＞ 98%；
Hydrous borax：Na2O10-20%, B2O330-40%；
Soda：Na2CO3>95%；
Carbonaceous material：C ＞ 95%；
2) condition met according to high pulling rate continuous small-billet casting covering slag component Ingredient Wt percentage ratio, each needed for calculating
The weight of raw material；
3）Fluorite, calcite, clinker, brium carbonate, soda, quartz sand, wrought aluminium vitriol are weighed according to above-mentioned calculating gained weight
Soil, lithium carbonate, hydrous borax, load weighted each raw material mixing is added in mineral hot furnace, in 30 points of 1350 DEG C of -1450 DEG C of inside holdings
Clock so as to which fusing is uniform, and natural cooling after coming out of the stove, so that obtain pre- melt；
4）After by broken for pre- melt being worked into below 200 mesh, aequum carbonaceous material is added, in refiner, then add siccative
The normal-temperature water that 0.8 ~ 1.2 times of weight, the cellulose binder of siccative weight 1.6 ~ 2% are refined 30 ~ 60 minutes, make slip；
5) slurry for obtaining is sent into drying and granulating in spraying granule drying tower, product requirement moisture is less than 0.5%, and granularity exists
0.01 ~ 2 mm scopes, sealing pack are stand-by.
Specific embodiment
The invention will be further described with reference to embodiments.
In the high pulling rate continuous small-billet casting production of certain steel mill, 1. 2. 4. a number slag is applied to pulling rate for 5 m/ to the covering slag of the present invention
Min, casting blank section are 140 × 140mm2Production；3. 5. pulling rate is applied to for 4 m/min, and casting blank section is 200 × 200 mm2
Production in, as a result show：In casting process, in crystallizer in order, there is no slag phenomenon in molten steel face.Covering slag slag consumes
Amount increases, and the strand cc billet surface quality of five groups of steel grades is good, and the original qualification rate in surface is more than 97%.
Table 1 lists 5 embodiments according to high pulling rate continuous small-billet casting protection slag ingredient production of the present invention
Chemical component weight percentage ratio and its corresponding important physicochemical property.
The Exemplary chemical composition of 1 continuous casting covering slag of the present invention of table（wt%）And its physicochemical property
The preferably feasible embodiment of the present invention is the foregoing is only, not thereby limits to the interest field of the present invention, all fortune
The equivalence changes that is made with present specification, are both contained within the interest field of the present invention.
Claims (3)
1. a kind of high pulling rate continuous small-billet casting covering slag, it is characterised in that by weight percentage, chemical composition includes：28%≤
CaO≤38%, 23%≤SiO2≤ 43%, 0%≤Al2O3≤ 10%, MgO≤3%, Fe2O3≤ 2%, 5%≤F≤7%, 6≤Na2O≤9%,
0%≤Li2O≤3%, 0%≤BaO≤15%, B2O3≤ 5%, 2%≤C≤10%, remaining are impurity；Basicity CaO/SiO2For 0.65 ~
1.6.
2. high pulling rate continuous small-billet casting covering slag as claimed in claim 1, it is characterised in that the continuous casting covering slag fusing point is
850 ~ 1120 DEG C, 1300 DEG C of viscositys are 0.05 ~ 0.35 Pa.s.
3. as described in any one of claim 1-2 high pulling rate continuous small-billet casting covering slag preparation method, it is characterised in that include
Following steps：
1）Select fluorite, calcite, clinker, brium carbonate, quartz sand, sintered bauxite, lithium carbonate, hydrous borax, soda and
Carbonaceous material is raw material, and the chemical composition of each raw material meets claimed below by weight percentage：
Fluorite：CaF2＞ 90%, SiO2＜ 6.0%, S ＜ 0.05%；
Calcite：CaO50-55%, Al2O3＜ 0.5%, MgO ＜ 2.5%, Fe2O3＜ 0.5%, SiO2＜ 1%；
Clinker：CaO62-68%, SiO220-25%, Al2O3＜ 6%, MgO ＜ 3%, Fe2O3＜ 5%；
Brium carbonate：BaCO3>95%；
Quartz sand：SiO2＞ 95%；
Sintered bauxite：Al2O3>80%, SiO2<8%, MgO ＜ 2.5%, Fe2O3＜ 3%；
Lithium carbonate：Li2CO3＞ 98%；
Hydrous borax：Na2O10-20%, B2O330-40%；
Soda：Na2CO3>95%；
Carbonaceous material：C ＞ 95%；
2) condition met according to high pulling rate continuous small-billet casting covering slag component Ingredient Wt percentage ratio, each needed for calculating
The weight of raw material；
3）Fluorite, calcite, clinker, brium carbonate, soda, quartz sand, wrought aluminium vitriol are weighed according to above-mentioned calculating gained weight
Soil, lithium carbonate, hydrous borax, load weighted each raw material mixing is added in mineral hot furnace, in 30 points of 1350 DEG C of -1450 DEG C of inside holdings
Clock so as to which fusing is uniform, and natural cooling after coming out of the stove, so that obtain pre- melt；
4）After by broken for pre- melt being worked into below 200 mesh, aequum carbonaceous material is added, in refiner, then add siccative
The normal-temperature water that 0.8 ~ 1.2 times of weight, the cellulose binder of siccative weight 1.6 ~ 2% are refined 30 ~ 60 minutes, make slip；
5) slurry for obtaining is sent into drying and granulating in spraying granule drying tower, product requirement moisture is less than 0.5%, and granularity exists
0.01 ~ 2 mm scopes, sealing pack are stand-by.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108127094A (en) * | 2018-01-11 | 2018-06-08 | 重庆大学 | A kind of non-reacted covering slag of high titanium steel |
| CN108160960A (en) * | 2017-12-28 | 2018-06-15 | 西峡龙成冶金材料有限公司 | A kind of 400 stainless steel continuous crystallizer protecting slags |
| CN109604548A (en) * | 2019-01-24 | 2019-04-12 | 西峡龙成冶金材料有限公司 | A kind of high pulling rate special-purpose multifunctional crystallizer protecting residue of sheet billet and preparation method thereof |
| CN109732048A (en) * | 2019-03-28 | 2019-05-10 | 西峡龙成冶金材料有限公司 | Covering slag, preparation method and application for Automobile Plate steel continuous casting crystallizer |
| WO2019113719A1 (en) * | 2017-12-14 | 2019-06-20 | Inx Process Spa | Agglomerate product comprising a compacted mixture primarily formed of oxides |
| CN111360217A (en) * | 2020-04-27 | 2020-07-03 | 西峡龙成冶金材料有限公司 | Special continuous casting crystallizer covering slag for CSP sheet billet alloy peritectic steel and application thereof |
| CN112391541A (en) * | 2019-08-14 | 2021-02-23 | 山特维克材料技术公司 | Mold flux and method for manufacturing nickel-based alloy |
| CN112605356A (en) * | 2020-12-16 | 2021-04-06 | 西峡龙成冶金材料有限公司 | Special covering slag for austenitic stainless steel continuous casting crystallizer and application thereof |
| CN113070457A (en) * | 2021-03-25 | 2021-07-06 | 中南大学 | Crystallizer casting powder for high-casting-speed continuous casting |
| CN114309507A (en) * | 2021-12-24 | 2022-04-12 | 湖南华菱涟源钢铁有限公司 | Crystallizer casting powder and application thereof |
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Cited By (11)
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| WO2019113719A1 (en) * | 2017-12-14 | 2019-06-20 | Inx Process Spa | Agglomerate product comprising a compacted mixture primarily formed of oxides |
| CN108160960A (en) * | 2017-12-28 | 2018-06-15 | 西峡龙成冶金材料有限公司 | A kind of 400 stainless steel continuous crystallizer protecting slags |
| CN108127094A (en) * | 2018-01-11 | 2018-06-08 | 重庆大学 | A kind of non-reacted covering slag of high titanium steel |
| CN109604548A (en) * | 2019-01-24 | 2019-04-12 | 西峡龙成冶金材料有限公司 | A kind of high pulling rate special-purpose multifunctional crystallizer protecting residue of sheet billet and preparation method thereof |
| CN109732048A (en) * | 2019-03-28 | 2019-05-10 | 西峡龙成冶金材料有限公司 | Covering slag, preparation method and application for Automobile Plate steel continuous casting crystallizer |
| CN112391541A (en) * | 2019-08-14 | 2021-02-23 | 山特维克材料技术公司 | Mold flux and method for manufacturing nickel-based alloy |
| CN111360217A (en) * | 2020-04-27 | 2020-07-03 | 西峡龙成冶金材料有限公司 | Special continuous casting crystallizer covering slag for CSP sheet billet alloy peritectic steel and application thereof |
| CN112605356A (en) * | 2020-12-16 | 2021-04-06 | 西峡龙成冶金材料有限公司 | Special covering slag for austenitic stainless steel continuous casting crystallizer and application thereof |
| CN113070457A (en) * | 2021-03-25 | 2021-07-06 | 中南大学 | Crystallizer casting powder for high-casting-speed continuous casting |
| CN113070457B (en) * | 2021-03-25 | 2022-06-14 | 中南大学 | Crystallizer casting powder for high-casting-speed continuous casting |
| CN114309507A (en) * | 2021-12-24 | 2022-04-12 | 湖南华菱涟源钢铁有限公司 | Crystallizer casting powder and application thereof |
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Application publication date: 20170315 |