CN106890961A - A kind of low titanium bilayer coverture and its application method for silicon steel - Google Patents
A kind of low titanium bilayer coverture and its application method for silicon steel Download PDFInfo
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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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Abstract
The invention provides a kind of low titanium bilayer coverture and its application method for silicon steel, the coverture includes upper strata coverture and lower floor's coverture, lower floor's coverture and steel contacts, and the upper strata coverture is located at lower floor's coverture top；The upper strata coverture includes the raw material of following percentage by weight：SiO244% 62%；MgO 2% 10%；CaO 1% 10%；0<Fe2O3≤ 7%；Al2O320% 38%；0<C (complete)≤1%；0<TiO2≤ 0.5%；Balance of burning is lost；Lower floor's coverture includes the raw material of following percentage by weight：SiO215% 25%；MgO 3% 8%；CaO 48% 68%；Fe2O32% 10%；0<Al2O3≤ 1%；0<C (complete)≤1%；0<TiO2≤ 0.2%；Balance of burning is lost, and the use of coverture of the present invention can effectively reduce the Ti content in silicon steel molten steel.
Description
Technical field
The invention belongs to metallurgical technology field, more particularly to a kind of double-deck coverture of low titanium for silicon steel and its user
Method.
Background technology
With reaching its maturity for the modern steel first refining-refining-continuous casting Trinity smelting process of industry, tundish covering flux
As one of important component, it is mainly used in being covered in tundish molten steel surface in casting process, its basic demand is：Not with
Adverse reaction in molten steel, it is to avoid pollution molten steel there is；Not aggressive basic tundish cylinder-packing.Its major function is：Molten steel insulation, it is to avoid
Metal in Tundish temperature drop in casting process is excessive and cold steel is tied on molten steel surface, forms liquid slag layer and is covered in molten steel surface to completely cut off
Air, prevents secondary oxidation of steel；The field trash floated in absorption molten steel, cleans molten steel.
Titanium in molten steel easily forms the TiC and TiN of small stable, and these hinder crystal grain to grow up strongly, to silicon steel, especially
It is that the magnetic property of high grade silicon steel has very bad influence.With the increase of Ti content in steel, the magnetic strength of steel is in be decreased obviously
Gesture.To ensure the demand for meeting user that final finished magnetic property can be stablized, it is necessary to by silicon steel Ti content stability contorting compared with
Low value.Found in actual production process, Ti content is notable to titanium composition influence in molten steel in casting cycle in coverture, but because of height
Silicon, aluminium content are high in grade silicon steel molten steel, cause silicon in casting cycle in molten steel, aluminium element by the titanium dioxide in middle cinder inclusion
Titanium is reduced, and causes molten steel to increase titanium.
The content of the invention
It is double it is a primary object of the present invention to provide a kind of low titanium for silicon steel for drawbacks described above of the prior art
Layer coverture and its application method, can effectively reduce the Ti content in silicon steel molten steel.
In order to achieve the above object, the present invention is adopted the following technical scheme that：A kind of low titanium bilayer coverture for silicon steel,
Including upper strata coverture and lower floor's coverture, lower floor's coverture and steel contacts, the upper strata coverture be located at it is described under
Layer coverture top；The upper strata coverture includes the raw material of following percentage by weight：
SiO244%-62%；
MgO 2%-10%；
CaO 1%-10%；
0<Fe2O3≤ 7%；
Al2O320%-38%；
0<C (complete)≤1%；
0<TiO2≤ 0.5%；
Balance of burning is lost；
Lower floor's coverture includes the raw material of following percentage by weight：
SiO215%-25%；
MgO 3%-8%；
CaO 48%-68%；
Fe2O32%-10%；
0<Al2O3≤ 1%；
0<C (complete)≤1%；
0<TiO2≤ 0.2%；
Balance of burning is lost.
As further preferred, raw material of the upper strata coverture including following percentage by weight：SiO2：45%；
MgO：5%；
CaO：6%；
Fe2O3：4%；
Al2O3：22%；
C (complete)：0.4%；
TiO2：0.2%；
Balance of burning is lost；
Lower floor's coverture includes the raw material of following percentage by weight：
SiO2：16%；
MgO：5%；
CaO：56%；
Fe2O3：4%；
Al2O3：0.6%；
C (complete)：0.4%；
TiO2：0.12%；
Balance of burning is lost.
As further preferably, the CaO is selected from wollastonite, calcium aluminate, quick lime and dolomite, the Al2O3It is selected from
Calcium aluminate and aluminium aluminite, the MgO are selected from magnesia and dolomite, the Fe2O3Selected from siderite and bloodstone, (complete) choosings of C
From wollastonite and vermiculite, the TiO2Selected from wollastonite and vermiculite.
As further preferred, the SiO2Selected from expanded perlite, carbonization rice husk and vermiculite,
As further preferably, it is 1- that lower floor's coverture is changed with the particle mean size of each component in the coverture of upper strata
10mm。
As further preferably, the silicon steel is name oriented or high grade non-oriented silicon steel high.
A kind of application method of low titanium bilayer coverture for silicon steel, methods described comprises the following steps：
1) when Metal in Tundish weight reaches the 1/8-1/4 of normal casting weight, 35-55kg lower floors coverture is added to arrive
Liquid steel level；When Metal in Tundish weight reaches the 1/3-2/3 of normal casting weight, 60-80kg lower floors coverture is added to arrive
Liquid steel level；
2) when Metal in Tundish is up to normal casting weight, after Metal in Tundish liquid level stabilizing, continue to add 80-100kg
Lower floor's coverture is in molten steel；
3) upper strata coverture is added after liquid steel level is sprawled uniformly after lower floor's coverture.
As further preferred, the step 1) in, lower floor's coverture is added to be included：In Metal in Tundish weight
It is each in the thermometric thief hole on both sides respectively to add 20-30kg lower floors coverture when reaching the 1/8-1/4 of normal casting weight,
15-25kg bags of lower floor's coverture is respectively added in stopper hole；When Metal in Tundish amount reaches the 2/3 of normal casting weight, in great Bao
60-80kg lower floors coverture is added in collar aperture.
As it is further preferably, when molten steel is even poured, when Metal in Tundish is exposed or opens, after adding lower floor's coverture,
Add upper strata coverture.
As further preferably, the lower floor's coverture added is 20-30kg.
The beneficial effects of the invention are as follows：
(1) present invention have found TiO in coverture2Content and silicon steel finished product titanium corresponding relation, and first will covering
TiO in agent2Content include precise control；And strictly control TiO in coverture2Content, it is ensured that upper strata coverture TiO2≤
0.5%, lower floor coverture TiO2≤ 0.2%, Ti sources are at utmost reduced, while the present invention takes bilayer to be respectively designed to packet
Into pattern, that is, ensured the fast melt of lower floor's coverture and the ability of dross inclusion adsorption, ensured that upper strata coverture is equal again
Even covering plays insulation and prevents from increasing the effect of N.
(2) present invention takes high alkalinity to design with lower floor's coverture of steel contacts, to reduce TiO in slag2Activity, drop
The thermodynamic condition of titanium reduction reaction between low slag gold.
(3) present invention has properly increased MgO, Fe in lower floor's coverture2O3Content, be conducive to adsorb molten steel in float
TiO2, and generation complex oxide is reacted, further reduce TiO in slag2Activity.
(4) present invention reduces Al2O3The amount of bringing into, to improve the distribution ratio of titanium between slag, steel, be conducive to steel grade Ti in slag
TiO2Conversion.
(5) present invention find out maturation Adding Way in batches step by step, it is ensured that effective thawing of coverture and
Even covering.
(6) confirmed through practical application, the high grade silicon steel produced using coverture of the present invention, finished product Ti content relative drop
2-3ppm, finished product magnetic property is obviously improved.
(7) aluminium that the present invention can be in stability contorting casting process damages and increases N.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the application method of the low titanium bilayer coverture that the embodiment of the present invention is used for silicon steel.
Specific embodiment
The present invention, can be by high grade silicon steel by providing a kind of low titanium bilayer coverture and its application method for silicon steel
Ti content stability contorting in lower value, filled up the Ti content control in the prior art not to silicon steel and made the sky of research
In vain.
In order to solve drawbacks described above, the main thought of the embodiment of the present invention is：
The embodiment of the present invention is used for the low titanium bilayer coverture of silicon steel, including upper strata coverture and lower floor's coverture, described
Lower floor's coverture and steel contacts, the upper strata coverture are located at lower floor's coverture top；The upper strata coverture includes
The raw material of following percentage by weight：
SiO244%-62%；
MgO 2%-10%；
CaO 1%-10%；
0<Fe2O3≤ 7%；
Al2O320%-38%；
0<C (complete)≤1%；
0<TiO2≤ 0.5%；
Balance of burning is lost；
Lower floor's coverture includes the raw material of following percentage by weight：
SiO215%-25%；
MgO 3%-8%；
CaO 48%-68%；
Fe2O32%-10%；
0<Al2O3≤ 1%；
0<C (complete)≤1%；
0<TiO2≤ 0.2%；
Balance of burning is lost.
Coverture used by existing smelting molten steel generally with good heat-insulating property, prevent secondary oxidation of steel, absorption folder
Miscellaneous grade is development goal, main or towards clean steel, and it is few to be specifically applied to the coverture of silicon steel smelting, and board high
Number orientation silicon steel and non-orientation silicon steel Ti content are notable to performance impact, and thus, how embodiment of the present invention primary study is reduced
Titanium source is brought into, and avoids titanium source by being reacted into molten steel, to ensure that the extremely low value of Ti content is controlled in molten steel.The embodiment of the present invention
Research is made to coverture Ti content and the control of silicon steel Ti content, the aluminium that Simultaneous Stabilization is controlled in casting process damages and increase N.
The embodiment of the present invention strictly controls TiO in coverture2Content, from without TiO2Component materials are prepared, it is ensured that
Upper strata coverture TiO2≤ 0.5%, lower floor coverture TiO2≤ 0.2%, at utmost reduce Ti sources.
For example, the CaO may be selected from wollastonite, calcium aluminate, quick lime and dolomite, the Al2O3May be selected from calcium aluminate and
Aluminium aluminite, the MgO may be selected from magnesia and dolomite, the Fe2O3Siderite and bloodstone are may be selected from, the C (complete) may be selected from
Wollastonite and vermiculite, the TiO2The raw material that may be selected from wollastonite and vermiculite etc. is brought into.
The preparation method of the coverture includes：Mixed by weight ratio by the material of above-mentioned each component, be crushed to average
Granularity is 1-10mm；Or each material is first crushed to particle mean size for 1-10mm, then mix by weight ratio and obtain final product.
As shown in figure 1, the embodiment of the present invention is used for the application method of the low titanium bilayer coverture of silicon steel, methods described includes
Following steps：
1) when Metal in Tundish weight reaches the 1/8-1/4 of normal casting weight, 35-55kg lower floors coverture is added to arrive
Liquid steel level；When Metal in Tundish weight reaches the 1/3-2/3 of normal casting weight, 60-80kg lower floors coverture is added to arrive
Liquid steel level；
2) when Metal in Tundish is up to normal casting weight, after Metal in Tundish liquid level stabilizing, continue to add 80-100kg
Lower floor's coverture is in molten steel；
3) upper strata coverture is added after liquid steel level is sprawled uniformly after lower floor's coverture.
When using, it is to be ensured that coverture is sprawled uniformly in tundish.Need to check continually on middle Baogang in casting process
Liquid level coverage condition, adds upper strata heat preserving agent in time, should prevent that molten steel face is exposed or show.When molten steel is even poured, if tundish
Molten steel is exposed or opens, and after can suitably adding lower floor's coverture, adds appropriate upper strata coverture.If molten steel when company pours
There is no exposed, lower floor's coverture can be not added with, directly add upper strata coverture.
In order to above and other purpose, feature and the advantage of the present invention can be become apparent, number cited below particularly is implemented
Example illustrates of the present invention low titanium bilayer coverture and its application method for silicon steel.
Embodiment 1
The special low titanium bilayer coverture of the high grade silicon steel of the embodiment of the present invention 1, including upper strata coverture and lower floor's coverture,
The chemical constituent and percentage by weight of its coverture at the middle and upper levels be：SiO245%, MgO 5%, CaO 6%, Fe2O34%,
Al2O322%, C (complete) 0.4%, TiO2≤ 0.2%, balance of burning is lost；Lower floor's coverture chemical composition and its percentage by weight
For：SiO216%, MgO 5%, CaO 56%, Fe2O34%, Al2O30.6%, C (complete) 0.4%, TiO20.12%, surplus
Lost to burn.
The embodiment of the present invention 1 is used for the application method of the low titanium bilayer coverture of silicon steel, and methods described comprises the following steps：
1) lower floor's coverture is initially added into middle bag Metal Weight 1/6, respectively in the thermometric thief hole Nei Gejia on both sides
Enter 25kg lower floors coverture, 20kg bags of lower floor's coverture is respectively added in stopper hole；During middle Baogang's water 2/3, in big jacket pore
Interior addition 70kg lower floors coverture.
2) when Metal in Tundish is up to normal casting weight, after middle Baogang's water level stabilization, addition 90kg lower floors coverture.
3) upper strata coverture is added after liquid steel level is sprawled uniformly after lower floor's coverture.Ensure coverture in middle bag
Sprawl uniform.Need to check continually on tundish molten steel face coverage condition in casting process, upper strata heat preserving agent is added in time, should prevent
Molten steel face is exposed or show.
4) when molten steel is even poured, if Metal in Tundish is exposed or opens, after can suitably adding lower floor's coverture (25kg),
Add appropriate upper strata coverture.If molten steel does not have exposed when company pours, lower floor's coverture can be not added with, directly add upper strata
Coverture.
Silicon steel described in the embodiment of the present invention 1 is name oriented silicon steel high.
Embodiment 2
The special low titanium bilayer coverture of the high grade silicon steel of the embodiment of the present invention 2, including upper strata coverture and lower floor's coverture,
The chemical constituent and percentage by weight of its coverture at the middle and upper levels be：SiO253%, MgO 7%, CaO 7%, Fe2O34%,
Al2O330%, C (complete) 0.7%, TiO20.34%, balance of burning is lost；Lower floor's coverture chemical composition and its percentage by weight
For：SiO221%, MgO 6%, CaO 61%, Fe2O37%, Al2O30.6%, C (complete) 0.6%, TiO20.08%, surplus
Lost to burn.
The embodiment of the present invention 2 is used for the application method of the low titanium bilayer coverture of silicon steel, and methods described comprises the following steps：
1) lower floor's coverture is initially added into middle bag Metal Weight 1/8, respectively in the thermometric thief hole Nei Gejia on both sides
Enter 20kg lower floors coverture, 15kg bags of lower floor's coverture is respectively added in stopper hole；During middle Baogang's water 1/3, in big jacket pore
Interior addition 60kg lower floors coverture.
2) when Metal in Tundish is up to normal casting weight, after middle Baogang's water level stabilization, addition 80kg lower floors coverture.
3) upper strata coverture is added after liquid steel level is sprawled uniformly after lower floor's coverture.Ensure coverture in middle bag
Sprawl uniform.Need to check continually on tundish molten steel face coverage condition in casting process, upper strata heat preserving agent is added in time, should prevent
Molten steel face is exposed or show.
4) when molten steel is even poured, if Metal in Tundish is exposed or opens, after can suitably adding lower floor's coverture (20kg),
Add appropriate upper strata coverture.If molten steel does not have exposed when company pours, lower floor's coverture can be not added with, directly add upper strata
Coverture.
Silicon steel described in the embodiment of the present invention 2 is high grade non-oriented silicon steel.
Embodiment 3
The special low titanium bilayer coverture of the high grade silicon steel of the embodiment of the present invention 3, including upper strata coverture and lower floor's coverture,
The chemical constituent and percentage by weight of its coverture at the middle and upper levels be：SiO258%, MgO 8%, CaO 8%, Fe2O35%,
Al2O336%, C (complete) 0.8%, TiO20.4%, balance of burning is lost；Lower floor's coverture chemical composition and its percentage by weight
For：SiO223%, MgO 6%, CaO 62%, Fe2O37%, Al2O30.8%, C (complete) 0.4%, TiO20.18%, surplus
Lost to burn.
The embodiment of the present invention 3 is used for the application method of the low titanium bilayer coverture of silicon steel, and methods described comprises the following steps：
1) lower floor's coverture is initially added into middle bag Metal Weight 1/4, respectively in the thermometric thief hole Nei Gejia on both sides
Enter 30kg lower floors coverture, 25kg bags of lower floor's coverture is respectively added in stopper hole；During middle Baogang's water 2/3, in big jacket pore
Interior addition 80kg lower floors coverture.
2) when Metal in Tundish is up to normal casting weight, after middle Baogang's water level stabilization, addition 100kg lower floors coverture.
3) upper strata coverture is added after liquid steel level is sprawled uniformly after lower floor's coverture.Ensure coverture in middle bag
Sprawl uniform.Need to check continually on tundish molten steel face coverage condition in casting process, upper strata heat preserving agent is added in time, should prevent
Molten steel face is exposed or show.
4) when molten steel is even poured, if Metal in Tundish is exposed or opens, after can suitably adding lower floor's coverture (30kg),
Add appropriate upper strata coverture.If molten steel does not have exposed when company pours, lower floor's coverture can be not added with, directly add upper strata
Coverture.
Silicon steel described in the embodiment of the present invention 3 is high grade non-oriented silicon steel.
Comparative example
Certain general dual layer coverture, including upper strata coverture and lower floor's coverture, the chemical constituent of its coverture at the middle and upper levels
And percentage by weight is：For：SiO244%, MgO 14%, CaO 0.4%, Fe2O312%, Al2O313%, TiO2
1.5%, balance of burning is lost；Lower floor's coverture chemical constituent and percentage by weight are：SiO250%, MgO 2%, CaO 31%,
Fe2O30.5%, Al2O33%, TiO21.5%, balance of burning is lost.
The influence of embodiment of the present invention 1-3 and comparative example to Ti content in molten steel see the table below 1：
Table 1
Technical scheme in above-mentioned the embodiment of the present application, at least has the following technical effect that or advantage：
(1) present invention have found TiO in coverture2Content and silicon steel finished product titanium corresponding relation, and first will covering
TiO in agent2Content include precise control；And strictly control TiO in coverture2Content, it is ensured that upper strata coverture TiO2≤
0.5%, lower floor coverture TiO2≤ 0.2%, Ti sources are at utmost reduced, while the present invention takes bilayer to be respectively designed to packet
Into pattern, that is, ensured the fast melt of lower floor's coverture and the ability of dross inclusion adsorption, ensured that upper strata coverture is equal again
Even covering plays insulation and prevents from increasing the effect of N.
(2) present invention takes high alkalinity to design with lower floor's coverture of steel contacts, to reduce TiO in slag2Activity, drop
The thermodynamic condition of titanium reduction reaction between low slag gold.
(3) present invention has properly increased MgO, Fe in lower floor's coverture2O3Content, be conducive to adsorb molten steel in float
TiO2, and generation complex oxide is reacted, further reduce TiO in slag2Activity.
(4) present invention reduces Al2O3The amount of bringing into, to improve the distribution ratio of titanium between slag, steel, be conducive to steel grade Ti in slag
TiO2Conversion.
(5) present invention find out maturation Adding Way in batches step by step, it is ensured that effective thawing of coverture and
Even covering.
(6) confirmed through practical application, the high grade silicon steel produced using coverture of the present invention, finished product Ti content relative drop
2-3ppm, finished product magnetic property is obviously improved.
(7) aluminium that the present invention can be in stability contorting casting process damages and increases N.
, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described
Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent
Select embodiment and fall into having altered and changing for the scope of the invention.Obviously, those skilled in the art can be to the present invention
Carry out various changes and modification without departing from the spirit and scope of the present invention.So, if these modifications of the invention and modification
Belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to exist comprising these changes and modification
It is interior.
Claims (10)
1. a kind of low titanium bilayer coverture for silicon steel, including upper strata coverture and lower floor's coverture, lower floor's coverture
With steel contacts, the upper strata coverture is positioned at lower floor's coverture top；It is characterized in that：The upper strata coverture includes
The raw material of following percentage by weight：
SiO244%-62%；
MgO 2%-10%；
CaO 1%-10%；
0<Fe2O3≤ 7%；
Al2O320%-38%；
0<C (complete)≤1%；
0<TiO2≤ 0.5%；
Balance of burning is lost；
Lower floor's coverture includes the raw material of following percentage by weight：
SiO215%-25%；
MgO 3%-8%；
CaO 48%-68%；
Fe2O32%-10%；
0<Al2O3≤ 1%；
0<C (complete)≤1%；
0<TiO2≤ 0.2%；
Balance of burning is lost.
2. the low titanium bilayer coverture for silicon steel according to claim 1, it is characterised in that：The upper strata coverture bag
Include the raw material of following percentage by weight：
SiO2：45%；
MgO：5%；
CaO：6%；
Fe2O3：4%；
Al2O3：22%；
C (complete)：0.4%；
TiO2：0.2%；
Balance of burning is lost；
Lower floor's coverture includes the raw material of following percentage by weight：
SiO2：16%；
MgO：5%；
CaO：56%；
Fe2O3：4%；
Al2O3：0.6%；
C (complete)：0.4%；
TiO2：0.12%；
Balance of burning is lost.
3. the low titanium bilayer coverture for silicon steel according to claim 1 and 2, it is characterised in that：The CaO is selected from silicon
Lime stone, calcium aluminate, quick lime and dolomite, the Al2O3Selected from calcium aluminate and aluminium aluminite, the MgO is selected from magnesia and white clouds
Stone, the Fe2O3Selected from siderite and bloodstone, the C is (complete) to be selected from wollastonite and vermiculite, the TiO2Selected from wollastonite and
Vermiculite.
4. the low titanium bilayer coverture for silicon steel according to claim 1 and 2, it is characterised in that：The SiO2Selected from swollen
Swollen perlite, carbonization rice husk and vermiculite.
5. the low titanium bilayer coverture for silicon steel according to claim 1 and 2, it is characterised in that：Lower floor's covering
The particle mean size of each component is 1-10mm in agent and upper strata coverture.
6. the low titanium bilayer coverture for silicon steel according to claim 1 and 2, it is characterised in that：The silicon steel is height
Name oriented or high grade non-oriented silicon steel.
7. the application method of the double-deck coverture of the low titanium for silicon steel as described in claim any one of 1-6, it is characterised in that：
Methods described comprises the following steps：
1) when Metal in Tundish weight reaches the 1/8-1/4 of normal casting weight, 35-55kg lower floor's covertures to molten steel are added
Liquid level；When Metal in Tundish weight reaches the 1/3-2/3 of normal casting weight, 60-80kg lower floor's covertures to molten steel are added
Liquid level；
2) when Metal in Tundish is up to normal casting weight, after Metal in Tundish liquid level stabilizing, continue to add 80-100kg lower floors
Coverture is in molten steel；
3) upper strata coverture is added after liquid steel level is sprawled uniformly after lower floor's coverture.
8. the application method of the low titanium bilayer coverture for silicon steel according to claim 7, it is characterised in that：The step
It is rapid 1) in, lower floor's coverture is added to be included：When Metal in Tundish weight reaches the 1/8-1/4 of normal casting weight, point
It is each not in the thermometric thief hole on both sides to add 20-30kg lower floors coverture, it is each in stopper hole to add 15-25kg bags of lower floor's covering
Agent；When Metal in Tundish amount reaches the 1/3-2/3 of normal casting weight, the covering of 60-80kg lower floors is added in big jacket pore
Agent.
9. the application method of the low titanium bilayer coverture for silicon steel according to claim 7, it is characterised in that：The side
Method also includes：When molten steel is even poured, when Metal in Tundish is exposed or opens, after adding lower floor's coverture, upper strata coverture is added.
10. the application method of the low titanium bilayer coverture for silicon steel according to claim 9, it is characterised in that：It is described
The lower floor's coverture added is 20-30kg.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107552746A (en) * | 2017-08-31 | 2018-01-09 | 赣州鼎洋贸易有限公司 | A kind of heat preserving agent for liquid steel and its insulation oxidant layer |
| CN107685140A (en) * | 2017-09-08 | 2018-02-13 | 河钢股份有限公司承德分公司 | A kind of method for reducing tundish covering flux consumption |
| CN109454210A (en) * | 2018-12-24 | 2019-03-12 | 江苏嘉耐高温材料有限公司 | A kind of ultra-thin band double-layer tundish covering agent |
| CN111500825A (en) * | 2020-06-04 | 2020-08-07 | 北京首钢股份有限公司 | Method for controlling titanium content behind steelmaking converter |
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| CN111500825A (en) * | 2020-06-04 | 2020-08-07 | 北京首钢股份有限公司 | Method for controlling titanium content behind steelmaking converter |
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