CN112247088B - Silicon steel crystallizer covering slag - Google Patents
Silicon steel crystallizer covering slag Download PDFInfo
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- CN112247088B CN112247088B CN202011198804.9A CN202011198804A CN112247088B CN 112247088 B CN112247088 B CN 112247088B CN 202011198804 A CN202011198804 A CN 202011198804A CN 112247088 B CN112247088 B CN 112247088B
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- silicon steel
- steel crystallizer
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- covering slag
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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Abstract
The application discloses silicon steel crystallizer covering slag comprises the following components in percentage by weight: SiO 22：38.06%，Al2O3：1.47%，Fe2O3：0.72%，CaO：31.15%，MgO：3.92%，(Na2O+K2O)%：7.21%，F‑(fluoride ion): 6.4%, F.C (all carbon): 1.61%, H2O is less than 0.5 percent, and the balance is binder and inevitable impurity elements; alkalinity of silicon steel crystallizer covering slag: 0.82, melting point: 1074 ℃, melting speed S/1350 ℃: 26 seconds, viscosity: 0.28Pa.S, particle size 0.15-1 mm: not less than 96 percent, volume weight g/cm3：0.77。
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to silicon steel crystallizer casting powder.
Background
The protective slag of continuous casting crystallizer is the main consumption raw material which has direct influence on the stability of continuous casting process and the quality of casting blank, and is added into the crystallizer during continuous casting production and mainly consists of SiO2-CaO-CaF2-Al2O3-Na2O-C and the like. The casting powder added into the crystallizer is influenced by the heat of molten steel and is divided into a liquid slag layer, a sintering layer and a powder slag layer, and the following functions are realized through the three-layer structure and chemical reaction: the method has the advantages of keeping the temperature of the surface of the molten steel, preventing secondary oxidation of air to the molten steel, absorbing floating impurities on the surface of the molten steel, lubricating a solidified blank shell and a crystallizer and controlling the heat transfer speed and uniformity in the casting blank cooling process.
At present, 3 continuous serious pits from the beginning to the end are easy to appear on the upper surface of a slab of the used continuous casting crystallizer casting powder of a thick silicon steel plate. In order to improve the defect, the aims of improving the viscosity and the performance are fulfilled by adjusting the chemical components of the casting powder. Through experiments, the problem can be effectively solved.
Disclosure of Invention
The technical problem to be solved is as follows: the application mainly provides the silicon steel crystallizer covering slag, and solves the technical problems that 3 continuous serious pits from head to tail easily appear on the upper surface of a plate blank in the prior art.
The technical scheme is as follows:
the silicon steel crystallizer casting powder comprises the following components in percentage by weight: SiO 22：38.06-38.28%，Al2O3：1.47-1.66%，Fe2O3：0.63-0.72%，CaO：30.77-31.15%，MgO：3.92-4.09%，R2O%：7.21-8.30%，F-(fluoride ion): 6.4-8.16%, F.C (all carbon): 1.51-1.61%, H2O is less than 0.5 percent, and the balance is binder and inevitable impurity elements.
As a preferred technical scheme of the invention: the alkalinity of the silicon steel crystallizer covering slag is as follows: 0.80-0.82, melting point: 1074 and 1085 ℃, melting speed S/1350 ℃: 26 seconds, viscosity: 0.195-0.28Pa.S, particle size 0.15-1 mm: not less than 96 percent, volume weight g/cm3：0.77-0.83。
As a preferred technical scheme of the invention: the silicon steel crystallizer casting powder comprises the following components in percentage by weight: SiO 22：38.06%，Al2O3：1.47%，Fe2O3： 0.72%，CaO： 31.15%，MgO：3.92%，R2O%：7.21%，F-(fluoride ion): 6.4%, F.C (all carbon): 1.61%, H2O is less than 0.5 percent, and the balance is binder and inevitable impurity elements.
As a preferred technical scheme of the invention: the alkalinity of the silicon steel crystallizer covering slag is as follows: 0.82, melting point: 1074 ℃, melting speed S/1350 ℃: 26 seconds, viscosity: 0.28Pa.S, particle size 0.15-1 mm: not less than 96 percent, volume weight g/cm3：0.77。
As a preferred technical scheme of the invention: the R is2R in O is Na and/or K.
Has the advantages that: compared with the prior art, the technical scheme adopted by the silicon steel crystallizer covering slag has the following technical effects:
1. the purposes of improving viscosity and performance are achieved by adjusting the chemical components of the covering slag;
2. the pit (pit) problem on the surface of the blank is related to the inflow uniformity of the molten slag and the extrusion of the slag film sticking roller on the blank shell of the crystallizer, because in the molten steel of the aluminum-containing steel type, the aluminum oxide generated by the reaction of the aluminum and the silicon dioxide can improve the viscosity of the protective slag, the molten steel of the steel type hardly contains the aluminum and does not generate the silicon dioxide, and the viscosity of the surface of the molten steel is more active than other steel types and is easy to generate pit slag entrapment, so that the viscosity of the protective slag is improved to stabilize the activity of the surface of the molten steel, and the pit phenomenon on the surface of the blank is improved;
3. by adjusting R of the mold flux2O is Na2O+K2O and other components, the viscosity of the casting powder is improved, the melting point is reduced, and the problem of pits on the surface of the blank is solved.
Drawings
FIG. 1 is a surface pit topography of a blank in example 1 of the present invention
FIG. 2 is a surface dimple topography of the ingot in accordance with example 2 of the present invention.
FIG. 3 is a surface dimple topography map of the ingot in accordance with example 3 of the present invention.
FIG. 4 is a surface dimple topography map of the ingot in accordance with example 3 of the present invention.
Detailed Description
For further explanation of the various embodiments, the drawings which form a part of the disclosure and which are incorporated in and constitute a part of this specification, illustrate embodiments and, together with the description, serve to explain the principles of operation of the embodiments, and to explain, by reference, other possible embodiments and advantages of the invention. The following description will explain embodiments of the present invention in further detail with reference to the accompanying drawings.
Example 1
The silicon steel crystallizer casting powder comprises the following components in percentage by weight: SiO 22：38.06-38.28%，Al2O3：1.47-1.66%，Fe2O3：0.63-0.72%，CaO：30.77-31.15%，MgO：3.92-4.09%，R2O%：7.21-8.30%，F-(fluoride ion): 6.4-8.16%, F.C (all carbon): 1.51-1.61%, H2O is less than 0.5 percent, and the balance is binder and inevitable impurity elements. The R is2R in O is Na and K.
Alkalinity of silicon steel crystallizer covering slag: 0.80-0.82, melting point: 1074 and 1085 ℃, melting speed S/1350 ℃: 26 seconds, viscosity: 0.195-0.28Pa.S, particle size 0.15-1 mm: not less than 96 percent, volume weight g/cm3：0.77-0.83。
Example 2
The silicon steel crystallizer casting powder comprises the following components in percentage by weight: SiO 22：38.06%，Al2O3：1.47%，Fe2O3： 0.72%，CaO： 31.15%，MgO：3.92%，R2O%：7.21%，F-(fluoride ion): 6.4%, F.C (all carbon): 1.61%, H2O is less than 0.5 percent, and the balance is binder and inevitable impurity elements. The R is2R in O is Na and K.
Alkalinity of silicon steel crystallizer covering slag: 0.82, melting point: 1074 ℃, melting speed S/1350 ℃: 26 seconds, viscosity: 0.28Pa.S, particle size 0.15-1 mm: not less than 96 percent, volume weight g/cm3：0.77。
Example 3
The silicon steel crystallizer casting powder comprises the following components in percentage by weight: SiO 22： 38.28%，Al2O3： 1.66%，Fe2O3： 0.72%，CaO： 31.15%，MgO： 4.09%，R2O%： 8.30%，F-(fluoride ion): 8.16%, F.C (all carbon): 1.61%, H2O is less than 0.5 percent, and the balance is binder and inevitable impurity elements. The R is2R in O is Na and K.
Example 4
The silicon steel crystallizer casting powder comprises the following components in percentage by weight: SiO 22：38.06%，Al2O3：1.47%，Fe2O3：0.63%，CaO：30.77%，MgO：3.92%，R2O%：7.21%，F-(fluoride ion): 6.4%, F.C (all carbon): 1.51%, H2O is less than 0.5 percent, and the balance is binder and inevitable impurity elements. The R is2R in O is Na and K.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. The silicon steel crystallizer covering slag is characterized in that: the silicon steel crystallizer casting powder comprises the following components in percentage by weight: SiO 22：38.06-38.28%，Al2O3：1.47-1.66%，Fe2O3：0.63-0.72%，CaO：30.77-31.15%，MgO：3.92-4.09%，(Na2O+K2O)：7.21-8.30%，F-(fluoride ion): 6.4-8.16%, total carbon: 1.51-1.61%, H2O is less than 0.5 percent, and the balance is binder and inevitable impurity elements.
2. The silicon steel crystallizer mold flux of claim 1, wherein: the alkalinity of the silicon steel crystallizer covering slag is as follows: 0.80-0.82, melting point: 1074 and 1085 ℃, melting speed S/1350 ℃: 26 seconds, viscosity: 0.195-0.28Pa.S, particle size 0.15-1 mm: not less than 96 percent, volume weight g/cm3：0.77-0.83。
3. The silicon steel crystallizer mold flux of claim 1, wherein: the silicon steel crystallizer casting powder comprises the following components in percentage by weight: SiO 22：38.06%，Al2O3：1.47%，Fe2O3： 0.72%，CaO： 31.15%，MgO：3.92%，(Na2O+K2O)：7.21%，F-(fluoride ion): 6.4%, total carbon: 1.61%, H2O is less than 0.5 percent, and the balance is binder and inevitable impurity elements.
4. The silicon steel crystallizer mold flux of claim 3, wherein: the alkalinity of the silicon steel crystallizer covering slag is as follows: 0.82, melting point: 1074 ℃, melting speed S/1350 ℃: 26 seconds, viscosity: 0.28Pa.S, particle size 0.15-1 mm: not less than 96 percent, volume weight g/cm3：0.77。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102615259A (en) * | 2012-04-10 | 2012-08-01 | 河南省西保冶材集团有限公司 | Protective material for non-oriented clean silicon steel continuous casting crystallizer for nuclear power unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6148522A (en) * | 1984-08-16 | 1986-03-10 | Kawasaki Steel Corp | Manufacture of grain oriented silicon steel sheet having superior surface property, high flux density and low iron loss |
| JP2964452B2 (en) * | 1995-09-14 | 1999-10-18 | 日本冶金工業株式会社 | Flux for continuous casting of molten steel containing A1 and continuous casting method |
| CN100528406C (en) * | 2007-09-18 | 2009-08-19 | 攀钢集团攀枝花钢铁研究院 | Continuous casting crystallizer protective scoria for weathering steel and manufacturing method thereof |
| CN101758174B (en) * | 2009-12-30 | 2011-12-07 | 首钢总公司 | Mold powder capable of effectively controlling peritectic steel thick slab narrow face depression defect |
| CN102000794B (en) * | 2010-12-01 | 2012-12-12 | 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 |
| CN103551537B (en) * | 2013-11-05 | 2016-06-29 | 北京首钢股份有限公司 | Ultra-low-carbon steel, low carbon steel crystallizer protective slag and preparation method thereof |
| CN104399921B (en) * | 2014-11-13 | 2017-01-25 | 北京首钢股份有限公司 | Casting powder |
| CN108723313A (en) * | 2018-06-29 | 2018-11-02 | 洛阳普拉斯自动化科技装备有限公司 | The covering slag of high grade cold rolling silicon steel |
| CN110722119B (en) * | 2019-10-25 | 2021-12-07 | 广东韶钢松山股份有限公司 | Continuous casting production process for preparing low-carbon high-sulfur high-oxygen free-cutting steel at high drawing speed |
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| CN102615259A (en) * | 2012-04-10 | 2012-08-01 | 河南省西保冶材集团有限公司 | Protective material for non-oriented clean silicon steel continuous casting crystallizer for nuclear power unit |
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