CN105312523B - A kind of non-orientation silicon steel tundish covering flux - Google Patents
A kind of non-orientation silicon steel tundish covering flux Download PDFInfo
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- CN105312523B CN105312523B CN201410285203.XA CN201410285203A CN105312523B CN 105312523 B CN105312523 B CN 105312523B CN 201410285203 A CN201410285203 A CN 201410285203A CN 105312523 B CN105312523 B CN 105312523B
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- silicon steel
- orientation silicon
- tundish covering
- coverture
- covering flux
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Abstract
The present invention relates to a kind of non-orientation silicon steel tundish covering flux, mainly solves impurity content height, the poor thermal insulation property of existing tundish covering flux, it is difficult to meet the technical problem of non-orientation silicon steel direct casting.The technical solution adopted by the present invention is：A kind of non-orientation silicon steel tundish covering flux, the percentage by weight of its chemical composition is CaO 40~50%, SiO215~25%, Al2O3 5~8%, MgO 5~10%, MgCO310~12%, CaCO3 8~10%, CaF2 2~5%, C<1 %, Ti<0.06 %, P<0.01 %, S<0.01%, sial magnesium powder 2~5%, silicon, aluminium, the mass ratio of magnesium are 1 in sial magnesium powder：2：3, remaining is inevitable impurity.Coverture good heat insulating of the present invention, can effectively dross inclusion adsorption, prevent molten steel recarburization, be mainly used in the production of non-orientation silicon steel.
Description
Technical field
The invention belongs to metal smelt auxiliary material technical field, is related to tundish in conventional slab caster casting molten steel production and covers
Agent, more particularly to a kind of non-orientation silicon steel tundish covering flux.
Background technology
Tundish covering flux is covered in casting process in tundish on molten steel face, and its main function is：Heat-insulation and heat-preservation,
Molten steel face heat loss is reduced, prevents that temperature drop is excessive in casting cycle；Isolate molten steel and air, prevent secondary oxygen of the air to molten steel
Change；The non-metallic inclusion in molten steel face is floated up in dissolving, absorption molten steel, purifies molten steel；Do not avoid polluting steel with molten steel reaction
Water, prevent molten steel from returning sulphur etc..
The production technology and equipment of silicon steel are complicated, and each Composition Control is strict in steel, and impurity content requires extremely low, manufacturing process
It is longer than carbon steel, influence performance factor it is more than carbon steel, the control range ratio carbon steel of the liquid steel temperature in each composition and casting process is narrow
Deng " handicraft " being described as in steel.
As a kind of clean steel, non-orientation silicon steel has strict requirements to the impurity element in steel and inclusion content.
Because silicon steel inclusion belongs to non magnetic or weak magnetic substance, therefore the presence of which reduces the body of ferromagnetism matrix
Product, the heavy damage continuity of silicon steel matrix, microinclusions play pinning effect to domain wall drift, hinder domain rotation and farmland
Wall moves so that the matrix magnetization of silicon steel sheet is uneven, causes iron loss to increase, magnetic strength reduces, and works as inclusion size and farmland
When wall thickness (hundreds of nanometers) is close, the ability of pinning domain wall is most strong.Therefore for non-orientation silicon steel, reduce field trash
It is very necessary that quantity, which especially reduces microinclusions quantity,.
Temperature keeps the of a relatively high floating for being advantageous to field trash to remove in molten steel tundish.However as entering for cast
OK, molten steel temperature drop is inevitable.In order to keep molten steel constant temperature to pour into a mould, there is iron and steel enterprise to take Iso ionic Heating of Tundish
The shortcomings of high energy consumption, equipment operation maintenance cost is high be present in method, this method.Therefore, non-orientation silicon steel tundish covering flux,
Except requiring that there is good heat-insulating property, absorption to be mingled with and purify the ability of molten steel for it, carbon content should be strictly also controlled to keep away
Exempt from the carburetting of molten steel.The too low heat-insulating property that can make coverture of carbon content is deteriorated, and by selecting rational raw material and appropriate
Production method can improve the heat-insulating property of coverture.
Patent document both at home and abroad on tundish covering flux is many, and Chinese patent publication No. CN102000794A is " a kind of
Special double-layer carbon-free tundish covering agent for silicon steel and application method " solves the problems, such as heat-insulating property using covering agent in bilayer,
But with the progress of production and the continuous consumption of coverture, the acid slag on upper strata will also be fusing into lower floor, so as to reduce slag
The ability that basicity and absorption are mingled with.Patent CN200810040898 " a kind of tundish covering agent for oriented silicon steel " is mainly used in taking
To the special coverture of silicon steel, by reducing carbon in coverture, sulphur and T-Fe content, control the carburetting of molten steel, increase sulphur and Als ripples
Dynamic scope, it is mainly used in orientation silicon steel, and due to preventing Metal in Tundish carburetting, reduces the carbon content in coverture,
The measure of other enhancing coverture heat-insulating properties is not taken again, therefore its heat-insulating property is relatively poor, easily causes molten steel temperature
Difference is larger, is unfavorable for the process stabilization control of the magnetic property of silicon steel.Patent CN10131288A mainly reduces the content of carbon, and its
In contain TiO2, the steel grade for having strict demand to Ti contents can not be produced.The carbon-free middle bag of patent CN102259175.A calcium magnalium matter
Coverture mainly ensures the heat-insulating property of high alkalinity coverture using carbonate and mist projection granulating production method.
The content of the invention
It is an object of the invention to provide a kind of non-orientation silicon steel tundish covering flux, mainly solves existing tundish covering
The impurity content of agent is high, poor thermal insulation property, it is difficult to meets the technical problem of non-orientation silicon steel direct casting.
The technical thought of the present invention is that the guarantor of coverture is improved by the raw material of reasonable selection and appropriate production method
Warm nature energy.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
A kind of non-orientation silicon steel tundish covering flux, the percentage by weight of its chemical composition is CaO 40~50%, SiO2
15~25%, Al2O3 5~8%, MgO 5~10%, MgCO310~12%, CaCO3 8~10%, CaF2 2~5%, C<1 %, Ti<
0.06 %, P<0.01 %, S<0.01%, sial magnesium powder 2~5%, silicon, aluminium, the mass ratio of magnesium are 1 in sial magnesium powder：2：3,
Remaining is inevitable impurity.
Coverture of the present invention adds dolomite, and its main component is MgCO3、CaCO3.With addition of main after dolomite in coverture
Three effects can be played：1st, decompose under the high temperature conditions reaction（1）,
（1）
The generated reactive gas, bubble is formed on surface, so as to play expanded foamed effect, is advantageous to the paving of coverture
Exhibition and fluffy effect, reduce the heat loss on molten steel surface and improve the heat-insulating property of coverture；2nd, the reaction is the endothermic reaction, energy
Enough delay the fusing time of coverture, so as to improve the heat-insulating property of coverture；3rd, decomposition reaction produces CaO, MgO, to centre
Bag magnesia coating and magnesium thermal insulation board corrode small；Ability pollution-free to molten steel, and thering is good absorption to be mingled with.
Coverture of the present invention adds certain sial magnesium powder, under the particle acts on high-temperature molten steel, is partially soluble in molten steel, it
Be all stronger oxyphilic element, so as to remove the oxygen in molten steel, reaction liberated heat can supplement tundish covering flux
Heat loss through radiation, the oxidation product of generation, which floats, to be entered in coverture, plays a part of purifying molten steel；Also part forms alloy and steamed
Vapour, reach the purpose for preventing oxygen from entering molten steel, play the not oxidized effect of protection molten steel.Additionally due to reaction (2),（3）
The presence of formula, the Als contents in molten steel are easily caused to produce fluctuation, and for non-orientation silicon steel, the Als content ripples in steel
Dynamic too conference has a negative impact to its magnetic property, therefore, reaction can be provided with addition of a number of aluminium powder in coverture
(2)、（3）Als needed for formula.
（2）
（3）
Further, the present invention employs lightweight material dolomite, intumescent material swells to improve the heat-insulating property of coverture
Perlite, while its bulk density is reduced using mist projection granulating production hollow ball shape particle coverture, so as to obtain good spreadability
Can be with the coverture of heat-insulating property.
The present invention considers the fusion temperature, basicity, heat-insulating property of coverture, and avoids polluting molten steel and purify steel
The multiple requirements such as water, to determine the main chemical compositions of coverture.Wherein, in order to avoid the carburetting of molten steel, present invention covering
C in agent<1%；In order to avoid molten steel increases Ti, the Ti in coverture of the present invention<0.06 %.Because P, S in non-orientation silicon steel contain
Measure extremely low, P in coverture of the present invention<0.01 %, S<0.01 %.
The physical property of coverture of the present invention：Fusing point（Hemisphere point temperature）For 1360~1390 DEG C；Viscosity at 1400 DEG C
For 0.25~0.30 PaS.
The present invention preparation method be：Raw material preparation → dispensing → stirs and evenly mixs → and water mill is into slurry → mist projection granulating → finished product
Packaging, wherein mixing stirring and water mill into each 60 minutes of the time of slurry.
Raw material of the present invention include melting charge, lime stone, dolomite, sial magnesium powder, coverture raw material of the present invention except
Melting charge is outside semi-finished product material, and other are the raw material of industry, raw material components（Percentage by weight）It is it is required that as follows：
Lime stone：CaO 50.0~58.0%, SiO2 1.0~4.0%, MgO 1.0~2.0%, other is scaling loss and impurity；
Dolomite：CaO 50.0~55.0%, SiO2 2.0~5.0%, MgO 35.0~45.0%；
Silicon, aluminium, the mass ratio of magnesium are 1 in sial magnesium powder：2：3；
Melting charge composition used is：CaO 50~60%, MgO 10~15%, Al2O3 5~10%, SiO2 20~22%,
CaF2:3~6%, C<1 %.
The present invention has following good effect compared with prior art：
1. coverture of the present invention has stronger dross inclusion adsorption ability and heat-insulating property, returning for molten steel can be effectively prevented
Sulphur, rephosphorization.
2. carbon, the content of titanium are low in coverture of the present invention, the carburetting of molten steel will not be caused and increase titanium.
Brief description of the drawings
Fig. 1 is table 1；
Fig. 2 is table 2；
Fig. 3 is table 3.
Embodiment
It is for a more detailed description to the present invention with specific embodiment 1-5 below
Table 1 is the percentage by weight of coverture chemical composition of the present invention, and surplus is inevitable impurity；
Table 2 is ladle, in tundish molten steel phosphorus content change；
Table 3 is ladle, in tundish liquid steel temperature change；
In table 3, T1, T2, T3 are respectively that ladle molten steel has poured into a mould 80 tons, 160 tons, 250 ton hour molten steel temperature in tundish.
The physical property of coverture of the present invention：Fusing point（Hemisphere point temperature）For 1360~1390 DEG C；Viscosity at 1400 DEG C
For 0.25~0.30 PaS.
Field test shows that the non-orientation silicon steel tundish covering flux of embodiment is different without crust sticky stick phenomenon, no stopper
Often corrode, spreadability is good, and molten steel recarburization is less than 2ppm；Molten steel will not be made to produce back sulphur, rephosphorization, Metal in Tundish temperature drop is less than 3
DEG C/stove.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
Into technical scheme, all fall within the protection domains of application claims.
Claims (3)
1. a kind of non-orientation silicon steel tundish covering flux, it is characterized in that the percentage by weight of chemical composition be CaO 40~
50%, SiO215~25%, Al2O35~8%, MgO 5~10%, MgCO310~12%, CaCO38~10%, CaF2 2
~5%, C<1%, Ti<0.06%, P<0.01%, S<0.01%, sial magnesium powder 2~5%, silicon, aluminium, the matter of magnesium in sial magnesium powder
Amount ratio is 1：2：3, remaining is inevitable impurity.
2. non-orientation silicon steel tundish covering flux as claimed in claim 1, it is characterized in that, described coverture is by melting
Material, lime stone, dolomite, sial magnesium powder these raw materials are by claim 1 into assignment system.
3. non-orientation silicon steel tundish covering flux as claimed in claim 2, it is characterized in that its constituent of described raw material
Percentage by weight be：Melting charge：CaO 50~60%, MgO 10~15%, Al2O35~10%, SiO220~22%,
CaF2:3~6%, C<1%；Lime stone：CaO 50.0~58.0%, SiO21.0~4.0%, MgO 1.0~2.0%, it is other
For scaling loss and impurity；Dolomite：CaO 50.0~55.0%, SiO22.0~5.0%, MgO 35.0~45.0%；Silicon-aluminum-magnesium
Silicon, aluminium, the mass ratio of magnesium are 1 in powder：2：3.
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| CN201410285203.XA CN105312523B (en) | 2014-06-24 | 2014-06-24 | A kind of non-orientation silicon steel tundish covering flux |
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| CN201410285203.XA CN105312523B (en) | 2014-06-24 | 2014-06-24 | A kind of non-orientation silicon steel tundish covering flux |
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| CN105312523A CN105312523A (en) | 2016-02-10 |
| CN105312523B true CN105312523B (en) | 2017-12-19 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106890961B (en) * | 2017-01-05 | 2019-10-11 | 北京首钢股份有限公司 | A kind of low titanium bilayer coverture and its application method for silicon steel |
| CN107382331A (en) * | 2017-06-28 | 2017-11-24 | 常州莱尚纺织品有限公司 | A kind of anti-slag type tundish paint |
| CN107698267A (en) * | 2017-10-18 | 2018-02-16 | 唐宏泉 | A kind of riser heating and insulating agent and its preparation technology |
| CN115229139B (en) * | 2022-06-15 | 2024-02-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail steel continuous casting tundish covering agent and adding method thereof |
Citations (4)
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|---|---|---|---|---|
| CN101224489A (en) * | 2008-01-31 | 2008-07-23 | 孙中强 | Covering agent with high melting point and high alkalinity |
| CN101633034A (en) * | 2008-07-24 | 2010-01-27 | 宝山钢铁股份有限公司 | Tundish covering agent for oriented silicon steel |
| CN102000794A (en) * | 2010-12-01 | 2011-04-06 | 西峡龙成冶金材料有限公司 | Special double-layer carbon-free tundish covering agent for silicon steel and use method thereof |
| CN102581240A (en) * | 2011-01-11 | 2012-07-18 | 宝山钢铁股份有限公司 | Tundish covering flux |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57184563A (en) * | 1981-05-06 | 1982-11-13 | Kawasaki Steel Corp | Powder for surface coating of molten metal in continuous casting |
| JPS60191645A (en) * | 1984-03-09 | 1985-09-30 | Nippon Steel Corp | Molten metal surface protective agent for continuous casting of molten steel |
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2014
- 2014-06-24 CN CN201410285203.XA patent/CN105312523B/en active Active
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|---|---|---|---|---|
| CN101224489A (en) * | 2008-01-31 | 2008-07-23 | 孙中强 | Covering agent with high melting point and high alkalinity |
| CN101633034A (en) * | 2008-07-24 | 2010-01-27 | 宝山钢铁股份有限公司 | Tundish covering agent for oriented silicon steel |
| CN102000794A (en) * | 2010-12-01 | 2011-04-06 | 西峡龙成冶金材料有限公司 | Special double-layer carbon-free tundish covering agent for silicon steel and use method thereof |
| CN102581240A (en) * | 2011-01-11 | 2012-07-18 | 宝山钢铁股份有限公司 | Tundish covering flux |
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| 一种新型不结壳中间包覆盖剂的研究与使用;李雯，江中块;《2005中国钢铁年会论文集》;20051231;第3卷;631-633 * |
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