CN106890961B - 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 present invention provides a kind of low titanium bilayer coverture and its application method for silicon steel, the coverture includes upper layer coverture and lower layer's coverture, and lower layer's coverture and steel contacts, the upper layer coverture are located above lower layer's coverture；The upper layer coverture includes the raw material of following weight percent: SiO244%-62%；MgO 2%-10%；CaO 1%-10%；0<Fe2O3≤ 7%；Al2O320%-38%；0 < C (complete)≤1%；0<TiO2≤ 0.5%；Surplus is to burn to lose；Lower layer's coverture includes the raw material of following weight percent: SiO215%-25%；MgO 3%-8%；CaO 48%-68%；Fe2O32%-10%；0<Al2O3≤ 1%；0 < C (complete)≤1%；0<TiO2≤ 0.2%；Surplus is to burn to lose, and the Ti content in silicon steel molten steel can be effectively reduced in the use of coverture of the present invention.
Description
Technical field
The invention belongs to metallurgical technology fields more particularly to a kind of for the low titanium bilayer coverture of silicon steel and its user
Method.
Background technique
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, be mainly used for being covered in tundish molten steel surface in continuous casting process, basic demand is: not with
Adverse reaction occurs for molten steel, avoids pollution molten steel；Not aggressive basic tundish cylinder-packing.Its major function is: molten steel insulation avoids
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 to float in absorption molten steel, cleans molten steel.
Titanium in molten steel easily forms the TiC and TiN of small stable, 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.For guarantee final finished magnetic property can be stable meet the needs of users, it is necessary to by silicon steel Ti content stability contorting compared with
Low value.It is found in actual production process, Ti content is significant to titanium composition influence in molten steel in casting process in coverture, but because of height
Silicon in grade silicon steel molten steel, aluminium content are high, cause silicon in casting process in molten steel, aluminium element by the titanium dioxide in middle cinder inclusion
Titanium reduction, causes molten steel to increase titanium.
Summary of the invention
In view of the above-mentioned drawbacks in the prior art, it is double that the main purpose of the present invention is to provide a kind of low titaniums for silicon steel
Layer coverture and its application method, can be effectively reduced the Ti content in silicon steel molten steel.
In order to achieve the above object, the present invention adopts the following technical scheme: a kind of low titanium bilayer coverture for silicon steel,
Including upper layer coverture and lower layer's coverture, lower layer's coverture and steel contacts, the upper layer coverture be located at it is described under
Above layer coverture；The upper layer coverture includes the raw material of following weight percent:
SiO244%-45%；
MgO 2%-5%；
CaO 1%-6%；
0<Fe2O3≤ 4%；
Al2O320%-22%；
0 < full C≤0.4%；
0<TiO2≤ 0.2%；
Surplus is to burn to lose；
Lower layer's coverture includes the raw material of following weight percent:
SiO216%-23%；
MgO 5%-6%；
CaO 56%-62%；
Fe2O34%-7%；
0<Al2O3≤ 0.8%；
0 < full C≤0.6%；
0<TiO2≤ 0.18%；
Surplus is to burn to lose；
The TiO2Selected from wollastonite and vermiculite.
As a further preference, the upper layer coverture includes the raw material of following weight percent:
SiO2: 45%；
MgO:5%；
CaO:6%；
Fe2O3: 4%；
Al2O3: 22%；
Full C (: 0.4%；
TiO2: 0.2%；
Surplus is to burn to lose；
Lower layer's coverture includes the raw material of following weight percent:
SiO2: 16%；
MgO:5%；
CaO:56%；
Fe2O3: 4%；
Al2O3: 0.6%；
Full C:0.4%；
TiO2: 0.12%；
Surplus is to burn to lose.
As a further preference, 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, the full C is selected from
Wollastonite and vermiculite.
As a further preference, the SiO2Selected from expanded perlite, carbonization rice husk and vermiculite,
As a further preference, it is 1- that lower layer's coverture, which is changed with the average particle size of each component in the coverture of upper layer,
10mm。
As a further preference, the silicon steel is high name oriented or high grade non-oriented silicon steel.
A kind of application method of the low titanium bilayer coverture for silicon steel, described method includes following steps:
1) when Metal in Tundish weight reaches the 1/8-1/4 of normal casting weight, 35-55kg lower layer coverture is added and arrives
Liquid steel level；When Metal in Tundish weight reaches the 1/3-2/3 of normal casting weight, 60-80kg lower layer coverture is added and arrives
Liquid steel level；
2) when Metal in Tundish reaches normal casting weight, after Metal in Tundish liquid level stabilizing, continue to add 80-100kg
Lower layer's coverture is into molten steel；
3) upper layer coverture is added after liquid steel level is sprawled uniformly after lower layer's coverture.
As a further preference, in the step 1), lower layer's coverture addition includes: in Metal in Tundish weight
When reaching the 1/8-1/4 of normal casting weight, 20-30kg lower layer coverture is respectively added in the thermometric sampling hole on both sides respectively,
15-25kg bags of lower layer's covertures are respectively added in stopper hole；When Metal in Tundish amount reaches the 2/3 of normal casting weight, in great Bao
60-80kg lower layer coverture is added in collar aperture.
As a further preference, when molten steel even pours, when Metal in Tundish is exposed or opens, after adding lower layer's coverture,
Add upper layer coverture.
As a further preference, the lower layer's coverture added is 20-30kg.
The beneficial effects of the present invention are:
(1) present invention has found TiO in coverture2Content and silicon steel finished product titanium corresponding relationship, and for the first time will covering
TiO in agent2Content be included in accurate control；And TiO in strict control coverture2Content ensure that upper layer coverture TiO2≤
0.5%, lower layer coverture TiO2≤ 0.2%, the source Ti is utmostly reduced, while the present invention takes bilayer to be respectively designed to be grouped
At mode, that is, ensured the fast melt of lower layer's coverture and the ability of dross inclusion adsorption, and ensured that upper layer coverture is equal
Heat preservation is played in even covering prevents from increasing the effect of N.
(2) present invention and lower layer's coverture of steel contacts take high alkalinity to design, 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 layer's coverture2O3Content is conducive to adsorb and float in molten steel
TiO2, and generation complex oxide is reacted, further decrease TiO in slag2Activity.
(4) present invention reduces Al2O3The amount of bringing into be conducive to steel grade Ti into slag to improve the distribution ratio of titanium between slag, steel
TiO2Conversion.
(5) present invention finds out mature Adding Way in batches step by step, ensure that effective thawing of coverture and equal
Even covering.
(6) it is 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 are obviously improved.
(7) present invention aluminium damage in stability contorting continuous casting process and can increase N.
Detailed description of the invention
Fig. 1 is flow diagram of the embodiment of the present invention for the application method of the low titanium bilayer coverture of 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 sky for not making research to the control of the Ti content of silicon steel in the prior art
It is white.
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 layer coverture and lower layer's coverture, described
Lower layer's coverture and steel contacts, the upper layer coverture are located above lower layer's coverture；The upper layer coverture includes
The raw material of following weight percent:
SiO244%-45%；
MgO 2%-5%；
CaO 1%-6%；
0<Fe2O3≤ 4%；
Al2O320%-22%；
0 < full C≤0.4%；
0<TiO2≤ 0.2%；
Surplus is to burn to lose；
Lower layer's coverture includes the raw material of following weight percent:
SiO216%-23%；
MgO 5%-6%；
CaO 56%-62%；
Fe2O34%-7%；
0<Al2O3≤ 0.8%；
0 < full C≤0.6%；
0<TiO2≤ 0.18%；
Surplus is to burn to lose；
The TiO2Selected from wollastonite and vermiculite.
Coverture used in existing smelting molten steel usually with good thermal insulation property, prevent secondary oxidation of steel, absorption folder
Miscellaneous wait is development goal, main still towards clean steel, and the coverture for being specifically applied to silicon steel smelting is fewer and fewer, and high board
Number orientation silicon steel and non-orientation silicon steel Ti content influence performance significant, and how primary study of the embodiment of the present invention is reduced as a result,
Titanium source is brought into, and avoids titanium source by being reacted into molten steel, to guarantee the extremely low value control of Ti content in molten steel.The embodiment of the present invention
Research made to coverture Ti content and the control of silicon steel Ti content, while aluminium damage and increasing N in stability contorting continuous casting process.
TiO in strict control coverture of the embodiment of the present invention2Content is selected and is free of TiO2Prepared by component materials, guarantee
Upper layer coverture TiO2≤ 0.5%, lower layer coverture TiO2≤ 0.2%, utmostly reduce the source Ti.
For example, the CaO can be selected from wollastonite, calcium aluminate, quick lime and dolomite, the Al2O3Can be selected from calcium aluminate and
Aluminium aluminite, the MgO can be selected from magnesia and dolomite, the Fe2O3It can be selected from siderite and bloodstone, the C (complete) can be selected from
Wollastonite and vermiculite, the TiO2The raw material that can be selected from wollastonite and vermiculite etc. is brought into.
The preparation method of the coverture includes: to mix by weight ratio by the material of above-mentioned each component, is crushed to average
Granularity is 1-10mm；Or it is 1-10mm that each material, which is first crushed to average particle size, is then mixed by weight ratio to obtain the final product.
As shown in Figure 1, application method of the embodiment of the present invention for the low titanium bilayer coverture of silicon steel, the method includes
Following steps:
1) when Metal in Tundish weight reaches the 1/8-1/4 of normal casting weight, 35-55kg lower layer coverture is added and arrives
Liquid steel level；When Metal in Tundish weight reaches the 1/3-2/3 of normal casting weight, 60-80kg lower layer coverture is added and arrives
Liquid steel level；
2) when Metal in Tundish reaches normal casting weight, after Metal in Tundish liquid level stabilizing, continue to add 80-100kg
Lower layer's coverture is into molten steel；
3) upper layer coverture is added after liquid steel level is sprawled uniformly after lower layer's coverture.
In use, to ensure that coverture is sprawled uniformly in tundish.It needs to check continually on intermediate Baogang in casting process
Liquid level coverage condition adds upper layer heat preserving agent in time, should prevent that molten steel face is exposed or show.When molten steel even pours, if tundish
Molten steel is exposed or opens, and after can suitably adding lower layer's coverture, adds suitable upper layer coverture.Molten steel when if company pours
Do not have exposed, lower layer's coverture can be not added, directly add upper layer coverture.
In order to which above and other purpose, feature and the advantage of the present invention can be clearer and more comprehensible, several implementations are cited below particularly
Example, to illustrate the low titanium bilayer coverture and its application method for silicon steel of the present invention.
Embodiment 1
The dedicated low titanium bilayer coverture of 1 high grade silicon steel of the embodiment of the present invention, including upper layer coverture and lower layer's coverture,
The chemical constituent and weight percent of its coverture at the middle and upper levels are as follows: SiO245%, MgO 5%, CaO6%, Fe2O34%, Al2O3
22%, C (complete) 0.4%, TiO2≤ 0.2%, surplus is to burn to lose；Lower layer's coverture chemical composition and its weight percent are as follows: SiO2
16%, MgO 5%, CaO 56%, Fe2O34%, Al2O30.6%, C (complete) 0.4%, TiO20.12%, surplus is to burn to lose.
Application method of the embodiment of the present invention 1 for the low titanium bilayer coverture of silicon steel, described method includes following steps:
1) it is initially added into lower layer's coverture in middle packet Metal Weight 1/6, respectively in the thermometric sampling hole Nei Gejia on both sides
Enter 25kg lower layer coverture, 20kg bags of lower layer's covertures are respectively added in stopper hole；When middle Baogang's water 2/3, in big jacket pore
Interior addition 70kg lower layer coverture.
2) when Metal in Tundish reaches normal casting weight, after middle Baogang's water level is stablized, 90kg lower layer coverture is added.
3) upper layer coverture is added after liquid steel level is sprawled uniformly after lower layer's coverture.Ensure coverture in middle packet
It sprawls uniformly.It needs to check continually on tundish molten steel face coverage condition in casting process, adds upper layer heat preserving agent in time, should prevent
Molten steel face is exposed or show.
4) when molten steel even pours, if Metal in Tundish is exposed or opens, after can suitably adding lower layer's coverture (25kg),
Add suitable upper layer coverture.If there there is no exposed molten steel when company pours, lower layer's coverture can be not added, directly add upper layer
Coverture.
Silicon steel described in the embodiment of the present invention 1 is high name oriented silicon steel.
Embodiment 2
The dedicated low titanium bilayer coverture of 2 high grade silicon steel of the embodiment of the present invention, including upper layer coverture and lower layer's coverture,
The chemical constituent and weight percent of its coverture at the middle and upper levels are as follows: SiO253%, MgO 7%, CaO7%, Fe2O34%, Al2O3
30%, C (complete) 0.7%, TiO20.34%, surplus is to burn to lose；Lower layer's coverture chemical composition and its weight percent are as follows: SiO2
21%, MgO 6%, CaO 61%, Fe2O37%, Al2O30.6%, C (complete) 0.6%, TiO20.08%, surplus is to burn to lose.
Application method of the embodiment of the present invention 2 for the low titanium bilayer coverture of silicon steel, described method includes following steps:
1) it is initially added into lower layer's coverture in middle packet Metal Weight 1/8, respectively in the thermometric sampling hole Nei Gejia on both sides
Enter 20kg lower layer coverture, 15kg bags of lower layer's covertures are respectively added in stopper hole；When middle Baogang's water 1/3, in big jacket pore
Interior addition 60kg lower layer coverture.
2) when Metal in Tundish reaches normal casting weight, after middle Baogang's water level is stablized, 80kg lower layer coverture is added.
3) upper layer coverture is added after liquid steel level is sprawled uniformly after lower layer's coverture.Ensure coverture in middle packet
It sprawls uniformly.It needs to check continually on tundish molten steel face coverage condition in casting process, adds upper layer heat preserving agent in time, should prevent
Molten steel face is exposed or show.
4) when molten steel even pours, if Metal in Tundish is exposed or opens, after can suitably adding lower layer's coverture (20kg),
Add suitable upper layer coverture.If there there is no exposed molten steel when company pours, lower layer's coverture can be not added, directly add upper layer
Coverture.
Silicon steel described in the embodiment of the present invention 2 is high grade non-oriented silicon steel.
Embodiment 3
The dedicated low titanium bilayer coverture of 3 high grade silicon steel of the embodiment of the present invention, including upper layer coverture and lower layer's coverture,
The chemical constituent and weight percent of its coverture at the middle and upper levels are as follows: SiO258%, MgO 8%, CaO8%, Fe2O35%, Al2O3
36%, C (complete) 0.8%, TiO20.4%, surplus is to burn to lose；Lower layer's coverture chemical composition and its weight percent are as follows: SiO2
23%, MgO 6%, CaO 62%, Fe2O37%, Al2O30.8%, C (complete) 0.4%, TiO20.18%, surplus is to burn to lose.
Application method of the embodiment of the present invention 3 for the low titanium bilayer coverture of silicon steel, described method includes following steps:
1) it is initially added into lower layer's coverture in middle packet Metal Weight 1/4, respectively in the thermometric sampling hole Nei Gejia on both sides
Enter 30kg lower layer coverture, 25kg bags of lower layer's covertures are respectively added in stopper hole；When middle Baogang's water 2/3, in big jacket pore
Interior addition 80kg lower layer coverture.
2) when Metal in Tundish reaches normal casting weight, after middle Baogang's water level is stablized, 100kg lower layer coverture is added.
3) upper layer coverture is added after liquid steel level is sprawled uniformly after lower layer's coverture.Ensure coverture in middle packet
It sprawls uniformly.It needs to check continually on tundish molten steel face coverage condition in casting process, adds upper layer heat preserving agent in time, should prevent
Molten steel face is exposed or show.
4) when molten steel even pours, if Metal in Tundish is exposed or opens, after can suitably adding lower layer's coverture (30kg),
Add suitable upper layer coverture.If there there is no exposed molten steel when company pours, lower layer's coverture can be not added, directly add upper layer
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 layer coverture and lower layer's coverture, the at the middle and upper levels chemical constituent of coverture
And weight percent are as follows: are as follows: SiO244%, MgO 14%, CaO 0.4%, Fe2O312%, Al2O313%, TiO2
1.5%, surplus is to burn to lose；Lower layer's coverture chemical constituent and weight percent are as follows: SiO250%, MgO 2%, CaO 31%,
Fe2O30.5%, Al2O33%, TiO21.5%, surplus is to burn to lose.
The influence of 1-3 of the embodiment of the present invention and comparative example to Ti content in molten steel see the table below 1:
Table 1
Technical solution in above-mentioned the embodiment of the present application, at least have the following technical effects or advantages:
(1) present invention has found TiO in coverture2Content and silicon steel finished product titanium corresponding relationship, and for the first time will covering
TiO in agent2Content be included in accurate control；And TiO in strict control coverture2Content ensure that upper layer coverture TiO2≤
0.5%, lower layer coverture TiO2≤ 0.2%, the source Ti is utmostly reduced, while the present invention takes bilayer to be respectively designed to be grouped
At mode, that is, ensured the fast melt of lower layer's coverture and the ability of dross inclusion adsorption, and ensured that upper layer coverture is equal
Heat preservation is played in even covering prevents from increasing the effect of N.
(2) present invention and lower layer's coverture of steel contacts take high alkalinity to design, 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 layer's coverture2O3Content is conducive to adsorb and float in molten steel
TiO2, and generation complex oxide is reacted, further decrease TiO in slag2Activity.
(4) present invention reduces Al2O3The amount of bringing into be conducive to steel grade Ti into slag to improve the distribution ratio of titanium between slag, steel
TiO2Conversion.
(5) present invention finds out mature Adding Way in batches step by step, ensure that effective thawing of coverture and equal
Even covering.
(6) it is 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 are obviously improved.
(7) present invention aluminium damage in stability contorting continuous casting process and can increase N.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.Obviously, those skilled in the art can be to the present invention
Carry out various modification and variations without departing from the spirit and scope of the present invention.If in this way, these modifications and changes of the present invention
Within the scope of the claims of the present invention and its equivalent technology, then the present invention is also intended to encompass these modification and variations and exists
It is interior.
Claims (10)
1. a kind of low titanium bilayer coverture for silicon steel, including upper layer coverture and lower layer's coverture, lower layer's coverture
With steel contacts, the upper layer coverture is located above lower layer's coverture；It is characterized by: the upper layer coverture includes
The raw material of following weight percent:
SiO244%-45%；
MgO 2%-5%；
CaO 1%-6%；
0<Fe2O3≤ 4%；
Al2O320%-22%；
0 < full C≤0.4%；
0<TiO2≤ 0.2%；
Surplus is to burn to lose；
Lower layer's coverture includes the raw material of following weight percent:
SiO216%-23%；
MgO 5%-6%；
CaO 56%-62%；
Fe2O34%-7%；
0<Al2O3≤ 0.8%；
0 < full C≤0.6%；
0<TiO2≤ 0.18%；
Surplus is to burn to lose；
The TiO2Selected from wollastonite and vermiculite.
2. the low titanium bilayer coverture according to claim 1 for silicon steel, it is characterised in that: the upper layer coverture packet
Include the raw material of following weight percent:
SiO2: 45%；
MgO:5%；
CaO:6%；
Fe2O3: 4%；
Al2O3: 22%；
Full C:0.4%；
TiO2: 0.2%；
Surplus is to burn to lose；
Lower layer's coverture includes the raw material of following weight percent:
SiO2: 16%；
MgO:5%；
CaO:56%；
Fe2O3: 4%；
Al2O3: 0.6%；
Full C:0.4%；
TiO2: 0.12%；
Surplus is to burn to lose.
3. the low titanium bilayer coverture according to claim 1 or 2 for silicon steel, 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 full C is selected from wollastonite and vermiculite.
4. the low titanium bilayer coverture according to claim 1 or 2 for silicon steel, it is characterised in that: the SiO2Selected from swollen
Swollen perlite, carbonization rice husk and vermiculite,
5. the low titanium bilayer coverture according to claim 1 or 2 for silicon steel, it is characterised in that: lower layer's covering
The average particle size of each component is 1-10mm in agent and upper layer coverture.
6. the low titanium bilayer coverture according to claim 1 or 2 for silicon steel, 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 low titanium bilayer coverture as claimed in any one of claims 1 to 6 for silicon steel, it is characterised in that:
Described method includes following steps:
1) when Metal in Tundish weight reaches the 1/8-1/4 of normal casting weight, 35-55kg lower layer coverture is added to molten steel
Liquid level；When Metal in Tundish weight reaches the 1/3-2/3 of normal casting weight, 60-80kg lower layer coverture is added to molten steel
Liquid level；
2) when Metal in Tundish reaches normal casting weight, after Metal in Tundish liquid level stabilizing, continue to add 80-100kg lower layer
Coverture is into molten steel；
3) upper layer coverture is added after liquid steel level is sprawled uniformly after lower layer's coverture.
8. the application method of the low titanium bilayer coverture according to claim 7 for silicon steel, it is characterised in that: the step
It is rapid 1) in, lower layer's coverture be added include: when Metal in Tundish weight reaches the 1/8-1/4 of normal casting weight, point
20-30kg lower layer coverture is not added respectively in the thermometric sampling hole on both sides, 15-25kg bags of lower layer's coverings are respectively added in stopper hole
Agent；When Metal in Tundish amount reaches the 1/3-2/3 of normal casting weight, the covering of 60-80kg lower layer is added in big jacket pore
Agent.
9. the application method of the low titanium bilayer coverture according to claim 7 for silicon steel, it is characterised in that: the side
Method further include: when molten steel even pours, when Metal in Tundish is exposed or opens, after adding lower layer's coverture, add upper layer coverture.
10. the application method of the low titanium bilayer coverture according to claim 9 for silicon steel, it is characterised in that: described
The lower layer's coverture added is 20-30kg.
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| 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 |
| CN109454210B (en) * | 2018-12-24 | 2020-10-20 | 江苏嘉耐高温材料股份有限公司 | Double-layer tundish covering agent for ultrathin belt |
| CN111500825B (en) * | 2020-06-04 | 2022-02-22 | 北京首钢股份有限公司 | Method for controlling titanium content behind steelmaking converter |
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| JPS5554520A (en) * | 1978-10-12 | 1980-04-21 | Nippon Steel Corp | Continuous-casting method for oriented electrical steel |
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