CN102009142B - 30MnSi steel special continuous casting crystallizer functional protection material - Google Patents
30MnSi steel special continuous casting crystallizer functional protection material Download PDFInfo
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- CN102009142B CN102009142B CN201010247663A CN201010247663A CN102009142B CN 102009142 B CN102009142 B CN 102009142B CN 201010247663 A CN201010247663 A CN 201010247663A CN 201010247663 A CN201010247663 A CN 201010247663A CN 102009142 B CN102009142 B CN 102009142B
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Abstract
The invention discloses a 30MnSi steel special continuous casting crystallizer functional protection material comprising the following raw materials in percentage by weight: 3 percent of carbon black, 9 percent of graphite, 4.5 percent of bentonite, 11 percent of fluorite, 7.5 percent of quartz, 2 percent of sodium fluoride, 2 percent of iron cement, 7 percent of white alkali, 1 percent of magnesia, 17 percent of wollastonite and 34 percent of grain slag. When the functional protection material is used, the spreadability, the thermal insulation and the smelting performance behave well; the heat transfer capacity around a crystallizer is stable and even, and the high-pull speed requirement is satisfied; the test slag strips are small, thereby improving the phenomenon of uneven inflow, and the lubricity of casting powder is good, thereby preventing adhesive breakout. The slag inclusion and slag adhesion phenomena cannot happen on the surface of a casting blank, and the surface quality of the casting blank is high.
Description
Technical field
The invention belongs to steel-making and use metallurgic auxiliary materials, the continuous-casting crystallizer especially used function protective material of particularly a kind of 30MnSi steel for building.
Background technology
The 30MnSi steel is mainly used in the production steel bar for prestressed concrete; Having high-strength tenacity, low loose property, good solderability, pier forges property, saves characteristics such as material; Strong with grip of concrete; Be widely used in the centrifugal pile tube of high-strength prestressed concrete, overhead bridge pier, the railroad sleeper iso-stress member, its market prospects are wide.
At present, fast-developing high-efficient continuous casting technology is ripe day by day, and metallurgy industry classifies develop high-quality steel energetically as one of main contents of development strategy as.The continuous casting production of high-quality steel also must take a series of effective measures to guarantee the quality of product; For example adopt continuous casting new technology, new technology; Secondary cooling zone adopts electromagnetic agitation, gently depresses, computer controlled automatic new technology or the like; Reduce slab quality with this, improve constantly continuous casting production efficiency.And this steel grade of 30MnSi is relatively stricter to quality requirement; Especially degree of purity and the surface quality to steel requires very harsh; Therefore the design of corresponding covering slag must possess stronger absorption and is mingled with ability, stronger stability, greasy property; To satisfy the needs of high pulling rate, high-quality zero defect strand, to these problems, we have developed the continuous-casting crystallizer especially used covering slag of this steel grade.
The Zhangjiagang is moistened loyal steel mill and is produced the 30MnSi steel, cast section: 140mm * 140mm, and 150mm * 150mm, in conjunction with stove machine match condition and output requirement, the general pulling rate of this casting machine is controlled at about 3.4 m/min.Because alloying element content is than higher in this steel grades; 1), good adsorption field trash function require surface quality good simultaneously, all kinds of defectives that must not influential its serviceability are so have higher requirement to covering slag:; And stable melting characteristic and control heat energy power; Because it is many to be prone to the oxidation element in this steel, covering slag needs good absorption molten steel come-up field trash function, and makes the melt cinder rerum natura keep stable; 2), suitable liquid slag layer thickness, liquid slag layer is blocked up or thin excessively, casting billet surface such as all can crack at defective, excellent not enough in very with thickness, crack number increases severely with the attenuate of liquid slag layer; 3), reduce the slag circle and generate, can block the passage that melt cinder flows downward when the slag circle is thick, the local long more surperficial lobe of stopping up of time is just serious more; 4), suitable slag consumption, the slag consumption of protection increases along with the minimizing of melt cinder viscosity, mold oscillation frequency, negative slip rate and pulling rate; 5), suitable viscosity coefficient of dross and slag film thickness; Suitable viscosity could protect suitable melt cinder to supply with; Thereby guarantee the even inflow of melt cinder, the slag film that acquisition is evenly distributed guarantees evenly solidifying of strand; Reduce frictional force and make crystallizer heat radiation homogenising, prevent the generation and the bonding steel leakage of crackle.In a word, the core of this covering slag technology is exactly quick slagging, to guarantee sufficient the lubricating of strand; Simultaneously must make crystallizer protecting residue liquid slag film have good filling property and slow cooling property, prevent that the inhomogeneous of strand from solidifying, thereby guarantee to obtain under the high pulling rate working condition high-quality strand.
Summary of the invention
For realizing the object of the invention; The continuous-casting crystallizer especially used function protective material of described 30MnSi steel; Its raw material comprises carbon black, graphite, bentonite, fluorite, quartz, sodium fluoride, iron mud, white alkali, magnesia, wollastonite, grain slag, and its weight percentage is respectively 3%, 9%, 4.5%, 11%, 7.5%, 2%, 2%, 7%, 1%, 17%, 34%.
The MgO weight percentage is 2.0～5.0% in the said function protective material, Fe
2O
3Weight percentage is 1.0～3.0%, dual alkalinity (CaO/SiO
2) be 0.87～0.93, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, K
2O, its weight percentage are SiO
231.5～35.5%, CaO 28.2～32.2%, Al
2O
32.8 Na～4.8%,
2O 5～7%, F
-5～7%, K
2O<1.0%.
Make further detailed description in the face of the present invention down:
30MnSi belongs to medium carbon steel, and alloy content is higher in the steel, when high casting speed continuous casting is produced, is prone to problems such as longitudinal crack, bonding, bleed-out, and therefore the emphasis of used covering slag also is to be to lubricate; Being mingled with the more covering slag absorbability that requires in addition in the steel will get well, and prevents casting billet surface slag inclusion and dry slag, must prevent that simultaneously oscillation mark from crossing dark initiation transverse crack.
The design of covering slag chemical composition.Owing to be little square billet production, must guarantee suitable heat transfer, at first require the dual alkalinity (CaO/SiO of covering slag
2) can not be too high; Generally to be controlled between 0.83～0.97; To guarantee that the slag film forms a certain proportion of glassy state in the crystallizer, improve lubricating between base shell and the crystallizer in the time of good heat transfer, the present invention controls the dual alkalinity of covering slag in 0.87～0.93 scope.Secondly, adopt the method for multiple flux to regulate covering slag fusing point and viscosity.Na as GPF (General Protection False slag flux important component
2The effect of O in covering slag of the present invention can impel the slag film to separate out crystal except reducing fusing point and viscosity on the other hand, and improves crystalline rate, destroys the glass properties of slag film, delays to conduct heat thereby reach, and reduces the purpose that longitudinal crack produces, Na in the covering slag of the present invention
2O content control range is 5.0～7.0%; A certain amount of MgO also can reduce covering slag fusing point, viscosity, crystallization temperature and setting temperature, improves the stability of covering slag, and MgO content control range is 2.0～5.0% in the covering slag of the present invention; It is to reduce slag viscosity that F-in the covering slag mainly acts on, and improves the melt cinder flowability, but will pay special attention to control the F-content in the covering slag in the present invention, if CaF in the slag
2Too high levels can cause cuspidine (3CaO.2SiO
2.CaF
2) wait separating out of high-melting-point thing, destroy the glass property of slag, lubricating condition is worsened, in addition F
-Ion concentration is too high also can to cause serious erosion to stretching into the formula mouth of a river, reduces mouth of a river service life, and for this reason, F-content control range is 5.0～7.0% in the covering slag of the present invention.At last, require covering slag to melt fast exactly, form enough liquid slag layers and guarantee certain slag consumption.The requirement mixed carbon comtent can not be too high, but can not be low excessively, otherwise the liquid slag layer and the sinter layer that form are too thick, make that the slagging scorification bar is serious, hinders the even inflow of covering slag.Therefore, join the carbon kind and select the big and fast carbon black of burning velocity of specific area for use, added a certain amount of graphite simultaneously, improve the spreadability of covering slag, accelerate the scaling loss of carbonaceous material, reduce sinter layer thickness.C content control range is 9.0～11.0% in the covering slag of the present invention, Fe
2O
3The content control range is 1.0～3.0%.
The covering slag physical property is confirmed.The present invention requires covering slag to have high melt point, viscosity and burn-off rate faster.Requirement specifically is set is: fusing point (hemisphere point temperature) is 1110～1150 ℃; 1300 ℃ viscosity is 0.2～0.4 PaS; Burn-off rate is 37～47 seconds (test of slag post method).
The performance of covering slag depends on the selection of system slag base-material, and conventional machine mixes slag and mainly adopts multiple raw material to mix.This research is selected to join the slag base-material with wollastonite as covering slag, and the conventional ingredient that this material contains is: SiO
2, CaO, MgO, Al
2O
3, compare with the fritting material of routine and not contain Na
2O, F-have controlled Na in the slag effectively
2O, F-content obtain to have suitable glass property and crystal property slag film, guarantee lubricating between strand and the crystallizer, and the stability of Slag Properties is improved, and have obviously increased the stability of result of use.
Production technology and quality control standard.The physicochemical property stability of covering slag finished product is directly related with use production technology and control criterion.In order to adapt to the high-quality demand of high pulling rate covering slag, covering slag of the present invention has adopted following quality control standard: 1) every kind of raw material granularity requires through 320 orders; 2) mixing stirs and each 1 hour water mill pulping time.
Adopt above-mentioned result of study to protect this covering slag that smelting material Group Co.,Ltd produces by the west, Henan Province; Moisten loyal steel mill cast 30MnSi steel in the Zhangjiagang, the slag consumption of pulling rate when 3.0～3.4m/min is 0.3 kg/T steel, molten steel surface liquid slag layer thickness 3～6mm.Show that through site test results when this covering slag used, spreadability, heat insulating ability and meltdown property performance were good in crystallizer; Heat output is stable and even around in the crystallizer, satisfies high pulling rate requirement; Test slag slag bar is little, improved the inflow uneven phenomenon, and the covering slag lubricity is good, has prevented sticker type breakout.Casting billet surface does not have slag inclusion and dry slag phenomenon, and cc billet surface quality is good.
The specific embodiment
Embodiment one:
The continuous-casting crystallizer especially used function protective material of a kind of 30MnSi steel; Its raw material comprises carbon black, graphite, bentonite, fluorite, quartz, sodium fluoride, iron mud, white alkali, magnesia, wollastonite, grain slag, and its weight percentage is respectively 3%, 9%, 4.5%, 11%, 7.5%, 2%, 2%, 7%, 1%, 17%, 34%.
The MgO weight percentage is 2.2% in the said covering slag, Fe
2O
3Weight percentage is 2.6%, dual alkalinity (CaO/SiO
2) be 0.90, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, K
2O, its weight percentage are SiO
231.5%, CaO 28.5%, Al
2O
34.6%, Na
2O 5.2%, F
-6.8%, K
2O 0.8%.
Embodiment two:
The continuous-casting crystallizer especially used function protective material of a kind of 30MnSi steel; Its raw material comprises carbon black, graphite, bentonite, fluorite, quartz, sodium fluoride, iron mud, white alkali, magnesia, wollastonite, grain slag, and its weight percentage is respectively 3%, 9%, 4.5%, 11%, 7.5%, 2%, 2%, 7%, 1%, 17%, 34%.
The MgO weight percentage is 5.0% in the said covering slag, Fe
2O
3Weight percentage is 1.3%, dual alkalinity (CaO/SiO
2) be 0.92, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, K
2O, its weight percentage are SiO
235.0%, CaO 32.2%, Al
2O
33.0%, Na
2O 6.7%, F
-5.7%, K
2O 0.3%.
Embodiment three:
The continuous-casting crystallizer especially used function protective material of a kind of 30MnSi steel; Its raw material comprises carbon black, graphite, bentonite, fluorite, quartz, sodium fluoride, iron mud, white alkali, magnesia, wollastonite, grain slag, and its weight percentage is respectively 3%, 9%, 4.5%, 11%, 7.5%, 2%, 2%, 7%, 1%, 17%, 34%.
The MgO weight percentage is 3.5% in the said covering slag, Fe
2O
3Weight percentage is 2.0%, dual alkalinity (CaO/SiO
2) be 0.90, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, K
2O, its weight percentage are SiO
233.5%, CaO 30.2%, Al
2O
33.8%, Na
2O 6%, F
-6%, K
2O 0.5%.
Claims (1)
1. continuous-casting crystallizer especially used function protective material of 30MnSi steel; It is characterized in that: its raw material comprises carbon black, graphite, bentonite, fluorite, quartz, sodium fluoride, iron mud, white alkali, magnesia, wollastonite, grain slag, and its weight percentage is respectively 3%, 9%, 4.5%, 11%, 7.5%, 2%, 2%, 7%, 1%, 17%, 34%.
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|---|---|---|---|
| CN201010247663A CN102009142B (en) | 2010-08-09 | 2010-08-09 | 30MnSi steel special continuous casting crystallizer functional protection material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010247663A CN102009142B (en) | 2010-08-09 | 2010-08-09 | 30MnSi steel special continuous casting crystallizer functional protection material |
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| CN102009142A CN102009142A (en) | 2011-04-13 |
| CN102009142B true CN102009142B (en) | 2012-10-03 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103071771A (en) * | 2012-11-22 | 2013-05-01 | 河南省西保冶材集团有限公司 | Stainless steel dedicated mold fluxes |
| CN103381474B (en) * | 2013-07-26 | 2015-06-10 | 河南省西保冶材集团有限公司 | Special continuous casting mold protection material for bearing 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 |
| CN112355261B (en) * | 2020-10-26 | 2022-06-28 | 中天钢铁集团有限公司 | Crystallizer casting powder suitable for producing peritectic steel through efficient continuous casting |
| CN114045374B (en) * | 2021-11-19 | 2022-11-25 | 西峡龙成冶金材料有限公司 | Special covering slag for nodular cast iron and preparation method and application thereof |
Citations (4)
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|---|---|---|---|---|
| US4130423A (en) * | 1976-04-05 | 1978-12-19 | Institut De Recherches De La Siderurgie Francaise (Irsid) | Pulverulent composition for forming protective layer on steel melts |
| CN101637810A (en) * | 2009-08-11 | 2010-02-03 | 河南省西保冶材集团有限公司 | SMS, Danieli plate blank medium carbon steel continuous casting functional protective material |
| CN101745616A (en) * | 2010-01-21 | 2010-06-23 | 河南省西保冶材集团有限公司 | Carbon alloy structure steel continuous casting crystallizer function protection material in stainless steel rectangular billet |
| CN101745615A (en) * | 2010-01-21 | 2010-06-23 | 河南省西保冶材集团有限公司 | Function protecting material of continuous casting crystallizer for large square low-carbon steel |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60141355A (en) * | 1983-12-29 | 1985-07-26 | Nippon Steel Corp | Protective agent for molten metal surface for continuous casting |
-
2010
- 2010-08-09 CN CN201010247663A patent/CN102009142B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4130423A (en) * | 1976-04-05 | 1978-12-19 | Institut De Recherches De La Siderurgie Francaise (Irsid) | Pulverulent composition for forming protective layer on steel melts |
| CN101637810A (en) * | 2009-08-11 | 2010-02-03 | 河南省西保冶材集团有限公司 | SMS, Danieli plate blank medium carbon steel continuous casting functional protective material |
| CN101745616A (en) * | 2010-01-21 | 2010-06-23 | 河南省西保冶材集团有限公司 | Carbon alloy structure steel continuous casting crystallizer function protection material in stainless steel rectangular billet |
| CN101745615A (en) * | 2010-01-21 | 2010-06-23 | 河南省西保冶材集团有限公司 | Function protecting material of continuous casting crystallizer for large square low-carbon steel |
Non-Patent Citations (1)
| Title |
|---|
| JP昭60-141355A 1985.07.26 |
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