CN106077545A - A kind of high carbon abrasion resistant steel crystallizer protecting cinder for continuous casting - Google Patents
A kind of high carbon abrasion resistant steel crystallizer protecting cinder for continuous casting Download PDFInfo
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- CN106077545A CN106077545A CN201610588495.3A CN201610588495A CN106077545A CN 106077545 A CN106077545 A CN 106077545A CN 201610588495 A CN201610588495 A CN 201610588495A CN 106077545 A CN106077545 A CN 106077545A
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- continuous casting
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- abrasion resistant
- resistant steel
- slag
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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
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- Mechanical Engineering (AREA)
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to a kind of high carbon abrasion resistant steel crystallizer protecting cinder for continuous casting, its composition percentage by weight is: CaO27.5%～33.5%, SiO227%～34%, Al2O3+ MgO2%～7%, Fe2O3< 5%, F2%～8%, R2O4.5%～10.5%, C3.5%～9.5%, CaO/SiO20.8～1.3, remaining component is impurity.After C, according to mentioned component, entering furnace melting through mixing pelletizing uniform after calculating dispensing, sieve after cooling is broken the corresponding carbonaceous framework material of addition, after through ball milling slurrying, last spray granulation is dried acquisition finished product protection slag.Described covering slag basicity is low between 0.8 1.3, and covering slag in use stable performance.In the casting process of high carbon abrasion resistant steel; described covering slag can efficiently control, uniform meniscus surface area initial solidification shell passes through the heat transfer to crystallizer wall of the slag film; can effectively reduce strand cave in, the probability of the surface defect such as lobe; and can guarantee that the melt cinder film lubrication to initial solidification shell simultaneously; avoid bonding and the generation of bonding steel leakage; be conducive to continuous casting stable smooth operation, and improve casting efficiency.
Description
Technical field
The present invention relates to continuous crystallizer protecting slag, be specifically related to a kind of high-carbon abrasion-resistant stee slab casting mold for continuous casting protection
Slag, it is adaptable to the depression that process of setting has the reaction of high carbon abrasion resistant steel to produce is easily generated crackle, and the high draw speed plate blank of bonding steel grade is even
Casting produces, and belongs to continuous casting production technical field.
Background technology
In the continuous casting production process of high-carbon abrasion-resistant stee slab, high carbon abrasion resistant steel liquidus temperature is relatively low, two-phase section temperature
Difference is bigger so that the stable green shell that high carbon abrasion resistant steel is formed in process of setting is thinner than mild steel；Simultaneously solidified structure and
The high-temperature mechanical property of steel can be impacted by microscopic segregation, under the high temperature conditions, and mutually synthermal high carbon abrasion resistant steel intensity meeting
It is markedly less than mild steel.Therefore, under identical ferrostatic pressure effect, it is big that high carbon abrasion resistant steel strand extends out deformation tendency, green shell
Contact with between crystallizer closely, in turn result in the frictional force between green shell and crystallizer wall and become big, increase bonding steel leakage occurrence probability.
Owing to during C in steel > 0.5, Ti > 1, significantly changing occurs in the organizational structure of steel, the surface quality of strand in casting process
Being difficult to control to, major defect is depression in the surface and lobe.The most abroad the employing molding mode that this type of steel is main is produced,
Continuous casting aspect is blank.My company combines emerging clear special steel and solves for this type of steel grade characteristic, the continuous casting slag that design matches
The defect of casting process, thus fill up this type of steel grade blank on continuous casting.Therefore the physicochemical property of covering slag and tradition continuous casting
Bigger difference is there is between covering slag.Require that slab height carbon abrasion resistant steel covering slag should have relatively low viscosity, relatively low
Fusing point, suitable crystallization temperature and good vitrification tendency.
Summary of the invention
Not enough in view of the foregoing defects the prior art has, the invention provides a kind of high-carbon wear-resisting steel plate continuous casting crystallization
Device covering slag, covering slag of the present invention coordinated in high-carbon abrasion-resistant stee slab casting process covering slag lubrication strand effectively,
While improving strand lubrication, improve cc billet surface quality, improve the production efficiency of continuous casting.
It is to be reached, the most such as by the composition of adjustment covering slag that the present invention realizes the technical solution of above-mentioned purpose
Under:
Its chemical ingredients by weight percent position: CaO27.5%～33.5%, SiO227%～34%, Al2O3+ MgO2%～7%, Fe2O3<
5%, F2%～8%, R2O4.5%～10.5%, C3.5%～9.5%, CaO/SiO20.8～1.3, wherein R2O is alkalinous metal oxidation
Thing, remaining component is impurity.
Further, described CaO/SiO2It is 0.8～1.3.
Described CaO is 32.5%, SiO2It is 33%, F-It is 7%, Al2O3, MgO sum be 6%, R2O is 9%, Fe2O3It is 1.5%, C
Being 4%, remaining is impurity.
Described CaO is 28%, SiO2It is 29%, F-It is 5.8%, Al2O3, MgO sum be 4.8%, R2O is 9%, Fe2O3It is 4%, C
Being 8.2%, remaining is impurity.
Described CaO is 30%, SiO2It is 31%, F-It is 5%, Al2O3, MgO sum be 5%, R2O is 7.5%, Fe2O3It is 2.5%, C
Being 6.5%, remaining is impurity.
The present invention has coordinated covering slag lubrication strand in high-carbon abrasion-resistant stee slab casting process effectively, improves strand lubrication
While, reduce crackle and the bleed-out incidence rate of casting billet surface, improve casting billet surface and subcutaneous quality, improve the life of continuous casting
Produce efficiency.
Detailed description of the invention
The present invention provides a kind of crystallizer protecting residue being applicable to casting process medium high carbon abrasion-resistant stee sheet billet continuous casting, the present invention
Continuous crystallizer protecting slag solve the technical problem that into: in high-carbon abrasion-resistant stee slab casting process, along with in covering slag adsorb
Aluminium sesquioxide in molten steel is mingled with and after titanium oxide precipitate, causes the fusing point of covering slag, viscosity to raise further, thus leads
Causing the harm continuous casting direct motion of covering slag greasy property deficiency, covering slag of the present invention is conducive to coordinating high carbon abrasion resistant steel casting process
With the contradiction lubricated, beneficially continuous casting direct motion after fusing point, viscosity raise after middle dross inclusion adsorption, thus improve slab quality and continuous casting
Production efficiency.
Specifically, the present invention realizes above-mentioned mesh by improving the stoicheiometry of continuous crystallizer protecting slag
, its chemical ingredients by weight percent meets: 27.5% < CaO < 33.5%, 27% < SiO2< 34%, 2% < Al2O3+ MgO < 7%, Fe2O3<
5%, 2% < F-< 8%, 4.5% < R2O < 10.5%, 3.5% < C < 9.5%, CaO/SiO2It is 0.8～1.3, wherein R2O is alkalinous metal
Oxide, remaining component is impurity.
Described CaO/SiO2It is 0.8～1.3.
Further, the preferable percentage by weight of its chemical analysis is: described CaO is 30%, SiO2It is 31%, F-It is 5%,
Al2O3, MgO sum be 5%, R2O is 7.5%, Fe2O3Being 2.5%, C is 6.5%, and remaining is impurity.
Described CaO is 32.5%, SiO2It is 33%, F-It is 7%, Al2O3, MgO sum be 6%, R2O is 9%, Fe2O3It is 1.5%, C
Being 4%, remaining is impurity.
Described CaO is 28%, SiO2It is 29%, F-It is 5.8%, Al2O3, MgO sum be 4.8%, R2O is 9%, Fe2O3It is 4%, C
Being 8.2%, remaining is impurity.
The chemical analysis mechanism of action of continuous crystallizer protecting slag of the present invention and the amount of allocating into thereof limit and are described as follows:
CaO: be the Main Ingredients and Appearance of cuspidine ore deposit phase in covering slag, wide and low cost of originating.During chemical analysis, will fluorite be fluorinated
The Ca element that calcium is brought into is converted into the CaO of corresponding percentage by weight.Due to the main component that CaO is crystallization phase, and covering slag
Needing quick crystallize with Heat Transfer Control at meniscus, so its weight percentages of components needs higher, and too high CaO will make guarantor
Protect slag primary crystallization hyperenergia, improve covering slag recrystallization temperature, deteriorate lubrication to a certain extent, through Design Theory and reality
Checking, determines that its weight percentage ranges is: 27.5% < CaO < 33.5%.
SiO2: for acidic oxide main in covering slag, also it is one of the main component of cuspidine, is weight in covering slag
Want network topology adult, with basic anhydride react generation low-melting compound, reduce covering slag fusing point.By controlling
Its addition adjustable protective slag melting point and crystal property, a certain amount of SiO2Be conducive to making the thickness of melt cinder film near meniscus
Maintain certain level, improve lubrication.But too high SiO2Easily weaken covering slag crystal property, through Design Theory and reality
Test, present invention SiO the most at last2Content controls at 27% < SiO2<34%。
F-: for flux main in covering slag, also it is one of main component generating cuspidine.Add within the specific limits
Enter, the high temperature viscosity of covering slag can be reduced, improve covering slag consumption, improve lubrication to a certain extent.Basicity relatively Gao Shijia
Enter too much, the most easily promote the precipitation of high-melting-point thing phase, unfavorable lubrication.F in covering slag of the present invention-Brought into by fluorite, chemistry
During component analysis, Ca in fluorite is scaled the CaO of corresponding percentage by weight.Through Design Theory and experiment, the present invention is by F-Contain
Amount span of control is 2% < F-<8%。
Al2O3+ MgO:Al2O3For amphoteric oxide, basic clinker belongs to network topology adult, can be at certain model
Enclose interior regulation slag crystal property.The viscosity of slag is easily increased considerably when its content exceedes certain limit, unfavorable lubrication, due to
Itself fusing point is higher, and the most easily generates high melting compound, so its content should not be too high.MgO belongs to alkali
Soil metal oxide, in covering slag, part replaces CaO, also can improve the greasy property of covering slag, but and Al2O3Equally, MgO
The fusing point of itself is higher, and is easily combined generation high melting compound with other component, can improve slag turnover when content is higher
Temperature, deteriorates strand lubrication.So through Design Theory and experiment, the present invention is by Al2O3+ content of MgO controls: 2% < Al2O3+
MgO<7%。
Fe2O3: there is the strongest oxidisability, should be by Fe2O3Amount control in relatively low scope, it is to avoid to molten steel oxygen supplement, warp
Crossing Design Theory and experiment, the present invention is by Fe2O3Percentage by weight controls in the scope less than 5%.
C: play the effect of skeleton isolation in covering slag, is mainly used in regulating the burn-off rate of covering slag, and prevents
The generation of excess agglomeration.C content is controlled in 3.5% < C < 9.5% scope by the present invention.
The preparation method step of high carbon abrasion resistant steel crystallizer protecting cinder for continuous casting is:
1) raw material and requirement: detect raw-material chemical composition, selects chemical component weight percentage ratio to meet claimed below
Raw material:
Jilin wollastonite: SiO2 52±3.5 CaO±3.5
Fluorite: CaF2 ≥90 SiO2 ＜ 7.2 CaCO3＜ 3.0
Boron glass: Al2O3＜ 9.5 R2O ＞ 15.0 B2O3 ＞ 27.8
Iron oxide red: Fe2O3≥35
Sintered bauxite: Al2O3≥80
Industrial soda: Na2CO3≥98.5
Taiyuan white carbon black: C is solid >=and 98
-285 graphite: C is solid >=and 85
Carburant C solid >=90
Glass: SiO2 70±3.0 Al2O3＜ 5.0 Na2O≥9.0
2) according to high carbon abrasion resistant steel crystallizer protecting cinder for continuous casting constitutional chemistry Ingredient Wt percentage ratio condition, it is calculated each
Raw-material part by weight；
3) corresponding raw material (except carbonaceous material) is weighed respectively, after load weighted raw material mix homogeneously according to calculating gained weight
Pelletize, enters fusing in electric furnace and uniformly (is incubated about 25min at 1350 DEG C ~ 1450 DEG C degree), and air cooling after coming out of the stove obtains pre-melt；
4), after pre-melt crushing grinding being crossed 200 mesh sieves, add the carbonaceous material prepared in advance, add in ball mill afterwards
Enter the normal-temperature water of siccative weight about 1 times, the binding agent of siccative weight 1%～2%, refine 45 minutes, make slip；
5) slip being sent into spraying granule drying tower spray granulation to be dried, finished product requires that moisture is not more than 0.5%, and granularity is less than
2mm, seals pack stand-by.
Table 1 lists three realities produced according to high carbon abrasion resistant steel crystallizer protecting cinder for continuous casting composition of the present invention
The chemical ingredients by weight percent of example, remaining is inevitable impurity.Table 2 lists corresponding some of three example covering slags
Important performance.Table 3 lists steel grade section and typical case's composition of three example covering slag correspondence casting.
The Exemplary chemical composition (percentage by weight, wt%) of table 1 continuous casting covering slag of the present invention
| Formula | SiO<sub>2</sub> | CaO | Al<sub>2</sub>O<sub>3</sub>+MgO | Fe<sub>2</sub>O<sub>3</sub> | F<sup>-</sup> | R<sub>2</sub>O | C |
| 1 | 32.5 | 33 | 6 | 1.5 | 7 | 9 | 4 |
| 2 | 28 | 29 | 4.8 | 4 | 5.8 | 9 | 8.2 |
| 3 | 30 | 31 | 5 | 2.5 | 5 | 7.5 | 6.5 |
The performance of table 2 continuous casting covering slag of the present invention
| Formula | 1300 DEG C of viscosity, Pa.S | Softening point, DEG C | Fusing point, DEG C | Pour point, DEG C |
| 1 | 0.110 | 977 | 1000 | 1035 |
| 2 | 0.113 | 965 | 990 | 1048 |
| 3 | 0.125 | 970 | 995 | 1043 |
The Exemplary chemical composition of the corresponding steel grade of table 3
| Composition | C | Si | Mn | Ti |
| 1 | ＞ 0.5 | 0.25—0.30 | 0.50—0.6 | ＞ 1.0 |
Wherein: this steel grade of casting is slab, section is 150mm × (1800 ~ 3200mm).Result of the test shows, is casting
In journey, mold liquid level is in order, the unusual conditions such as bonding steel leakage does not occurs, and crystallizer hot-fluid is stable.The original qualification rate of strand
All more than 98.5%, casting billet surface and subcutaneous quality are good.
Finally illustrating, above example is only in order to illustrate technical scheme and unrestricted, although with reference to relatively
The present invention has been described in detail by good embodiment, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified or equivalent, and without deviating from objective and the scope of technical solution of the present invention, it all should be contained at this
In the middle of the right of invention.
Claims (4)
- The highest carbon abrasion resistant steel crystallizer protecting cinder for continuous casting, it is characterised in that: its chemical ingredients by weight percent is: CaO27.5% ～33.5%, SiO227%～34%, Al2O3+ MgO2%～7%, Fe2O3< 5%, F2%～8%, R2O4.5%～10.5%, C3.5%～ 9.5%, CaO/SiO20.8～1.3, wherein R2O is alkaline metal oxide, and remaining component is impurity.
- 2. according to the high carbon abrasion resistant steel crystallizer protecting cinder for continuous casting described in claim 1 and 2, it is characterised in that described CaO is 32.5%, SiO2It is 33%, F-It is 7%, Al2O3, MgO sum be 6%, R2O is 9%, Fe2O3Being 1.5%, C is 4%, and remaining is impurity.
- 3. according to the high carbon abrasion resistant steel crystallizer protecting cinder for continuous casting described in claim 1 and 2, it is characterised in that described CaO is 28%, SiO2It is 29%, F-It is 5.8%, Al2O3, MgO sum be 4.8%, R2O is 9%, Fe2O3Being 4%, C is 8.2%, and remaining is miscellaneous Matter.
- 4. according to the high carbon abrasion resistant steel crystallizer protecting cinder for continuous casting described in claim 1 and 2, it is characterised in that described CaO is 30%, SiO2It is 31%, F-It is 5%, Al2O3, MgO sum be 5%, R2O is 7.5%, Fe2O3Being 2.5%, C is 6.5%, and remaining is miscellaneous Matter.
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Cited By (5)
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|---|---|---|---|---|
| CN108127093A (en) * | 2017-12-21 | 2018-06-08 | 武汉钢铁有限公司 | The method for eliminating non-oriented electromagnetic steel sheet volume surface chromatic aberration defect |
| CN110315040A (en) * | 2019-08-20 | 2019-10-11 | 西峡县恒基冶材有限公司 | A kind of high titanium abrasion-resistant stee continuous crystallizer protecting slag of high-carbon |
| CN110465637A (en) * | 2019-08-13 | 2019-11-19 | 南京钢铁股份有限公司 | A kind of abrasion-resistant stee low alkalinity low-carbon tundish covering flux and its application |
| CN114985691A (en) * | 2022-08-04 | 2022-09-02 | 张家港荣盛特钢有限公司 | Control method of surface grain boundary network cementite of continuous casting billet for medium-high carbon steel wire rod |
| CN117206481A (en) * | 2023-11-09 | 2023-12-12 | 北京科技大学 | Covering slag for high-pulling-speed continuous casting of high-carbon steel square billets and preparation method and application thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108127093A (en) * | 2017-12-21 | 2018-06-08 | 武汉钢铁有限公司 | The method for eliminating non-oriented electromagnetic steel sheet volume surface chromatic aberration defect |
| CN110465637A (en) * | 2019-08-13 | 2019-11-19 | 南京钢铁股份有限公司 | A kind of abrasion-resistant stee low alkalinity low-carbon tundish covering flux and its application |
| CN110315040A (en) * | 2019-08-20 | 2019-10-11 | 西峡县恒基冶材有限公司 | A kind of high titanium abrasion-resistant stee continuous crystallizer protecting slag of high-carbon |
| CN110315040B (en) * | 2019-08-20 | 2021-07-09 | 西峡县恒基冶材有限公司 | Continuous casting crystallizer casting powder for high-carbon high-titanium wear-resistant steel |
| CN114985691A (en) * | 2022-08-04 | 2022-09-02 | 张家港荣盛特钢有限公司 | Control method of surface grain boundary network cementite of continuous casting billet for medium-high carbon steel wire rod |
| CN114985691B (en) * | 2022-08-04 | 2022-10-25 | 张家港荣盛特钢有限公司 | Control method of surface grain boundary network cementite of continuous casting billet for medium-high carbon steel wire rod |
| CN117206481A (en) * | 2023-11-09 | 2023-12-12 | 北京科技大学 | Covering slag for high-pulling-speed continuous casting of high-carbon steel square billets and preparation method and application thereof |
| CN117206481B (en) * | 2023-11-09 | 2024-02-23 | 北京科技大学 | Covering slag for high-pulling-speed continuous casting of high-carbon steel square billets and preparation method and application thereof |
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