CN114472823A - Crystallizer casting powder - Google Patents
Crystallizer casting powder Download PDFInfo
- Publication number
- CN114472823A CN114472823A CN202111641697.7A CN202111641697A CN114472823A CN 114472823 A CN114472823 A CN 114472823A CN 202111641697 A CN202111641697 A CN 202111641697A CN 114472823 A CN114472823 A CN 114472823A
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- CN
- China
- Prior art keywords
- crystallizer
- casting
- cao
- sio
- mold flux
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Classifications
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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
Abstract
The invention relates to crystallizer covering slag which comprises the following components: CaO, SiO2、Al2O3、MgO、Na2O、Li2O, F and FC. The invention provides the mold powder which has good use performance and can ensure the long-time normal operation of a crystallizer, thereby improving the quality of a casting blank; after the covering slag is added to the liquid steel level in the crystallizer, the effects of heat insulation, secondary oxidation prevention, impurity absorption, casting blank lubrication and heat transfer control can be achieved.
Description
Technical Field
The invention relates to the technical field of steel casting, in particular to crystallizer casting powder.
Background
The manufacture of steel ranges from die casting to continuous casting, making the production of steel more efficient. The invention of the continuous casting crystallizer in the process changes the steel production from discontinuous production to continuous production. It can be said that the continuous casting mold is the "heart" of the entire continuous casting process, and the use of the continuous casting mold flux in combination with the submerged nozzle is one of the keys to maintain the normal operation of the continuous casting mold. Therefore, the continuous casting covering slag plays a role in lifting weight in the continuous casting process and has no substitution position for the high-efficiency and high-quality production of steel. The continuous casting covering slag is used as a functional material, and the development of decades is gradually transformed from experience to science from macroscopic physical and chemical property control to microscopic slag structure control.
The traditional continuous casting mold flux at present mainly comprises CaO and SiO2Adding appropriate amount of flux (alkali metal, alkaline earth metal oxide and fluoride, etc.) for fluxing, and adding melting speed regulating substance (carbon black, graphite and coke, etc.) for formingAnd (4) obtaining. Regardless of the type of the mold flux, it is required to perform various metallurgical functions in the mold, maintain smooth continuous casting, and control the quality of a cast slab. The existing casting powder has poor performance, cannot ensure the long-time normal operation of a crystallizer, and cannot improve the quality of a casting blank.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the mold powder which can ensure the long-time normal operation of a crystallizer so as to improve the quality of a casting blank.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
designing a crystallizer protection slag which contains the following components: CaO, SiO2、Al2O3、MgO、Na2O、Li2O, F and FC, the weight ratio of the components is:
CaO:16-26％；
SiO2:22-33％；
Al2O3:3-8％；
MgO:0-4％；
Na2O:6-12％；
Li2O:1.5-3％；
F:5-11％；
FC:2-7％。
further, the alkalinity of the crystallizer casting powder is 0.72-0.82%.
Further, the water content of the crystallizer casting powder is 0-0.5%.
The invention has the beneficial effects that: the crystallizer casting powder has good use performance, and can ensure the long-time normal operation of a crystallizer, thereby improving the quality of a casting blank; after the covering slag is added to the liquid steel level in the crystallizer, the effects of heat insulation, secondary oxidation prevention, impurity absorption, casting blank lubrication and heat transfer control can be achieved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The first embodiment is as follows:
a mold flux comprising the following components: CaO, SiO2、Al2O3、MgO、Na2O、Li2O, F and FC, the weight ratio of the components is:
CaO:19.68％；
SiO2:24.38％；
Al2O3:3.98％；
MgO:2.02％；
Na2O:9.98％；
Li2O:1.75％；
F:8.14％；
FC:3.65％。
in this example, the basicity of the mold flux was 0.81%.
In this example, the moisture of the mold flux was 0.35%.
The mold flux composition prepared by the embodiment has the following physical property parameters:
the melting point was 940 ℃ and the viscosity was 0.17 Pa.S.
Example two:
the crystallizer casting powder comprises the following components: CaO, SiO2、Al2O3、MgO、Na2O、Li2O, F and FC, the weight ratio of the components is:
CaO:20.59％；
SiO2:26.15％；
Al2O3:4.09％；
MgO:2.06％；
Na2O:9.73％；
Li2O:1.97％；
F:7.14％；
FC:3.88％。
in this example, the basicity of the mold flux was 0.79%.
In this example, the moisture of the mold flux was 0.32%.
The mold flux composition prepared by the embodiment has the following physical property parameters:
melting point 955 ℃ and viscosity 0.2 Pa.S.
Example three:
the crystallizer casting powder comprises the following components: CaO, SiO2、Al2O3、MgO、Na2O、Li2O, F and FC, the weight ratio of the components is:
CaO:19.69％；
SiO2:26.32％；
Al2O3:4.12％；
MgO:2.31％；
Na2O:9.59％；
Li2O:1.89％；
F:7.33％；
FC:3.76％。
in this example, the basicity of the mold flux was 0.75%.
In this example, the moisture of the mold flux was 0.29%.
The mold flux composition prepared by the embodiment has the following physical property parameters:
melting point 938 deg.C, viscosity 0.145 Pa.S.
In conclusion, after the casting powder is added to the liquid level of the molten steel in the crystallizer, the solid slag samples are accumulated on the liquid level of the molten steel to form a powder slag layer, so that the heat insulation and preservation effects are achieved, and the liquid level of the molten steel can be prevented from being encrusted due to excessive temperature drop of the molten steel; when the continuous casting covering slag is completely melted, a liquid slag layer is formed and covers the surface of the molten steel, and the liquid slag layer has the functions of isolating air and preventing the molten steel from being secondarily oxidized; the liquid slag flows into a gap between a new blank shell and a copper wall of the crystallizer from a slag pool on the molten steel surface to form a slag film, the liquid slag close to one side of a casting blank still keeps the liquid slag state under the action of high temperature of the surface of the casting blank and has the function of lubricating the casting blank, but the temperature of the liquid slag is reduced along with the reduction of the surface temperature of the casting blank in the longitudinal direction of the crystallizer, the rheological property is changed to influence the lubricating property of the casting blank, and the rheological property of the liquid slag film determines the lubricating effect of continuous casting mold powder.
CaO, SiO in the covering slag2And Al2O3Is a high melting point substance, and is prepared by adding some Na2O and Li2The substance with lower melting point of O is used as a fluxing agent, and the mixture of the substances forms a low-melting-point substance with weaker chemical bond under proper temperature condition to form liquid slag. The casting powder is melted by heat provided by molten steel on the molten steel surface, so that the melting temperature of the casting powder is required to be lower than the liquidus temperature of the molten steel, a molten slag layer with a certain thickness is formed on the molten steel surface to meet the requirement of continuous casting, and meanwhile, the melting temperature is required to be lower than the temperature of a casting blank out of the surface of a crystallizer to ensure the lubricating function of the casting powder. Therefore, the melting temperature of the mold flux required is different for different steel grades, drawing speeds and sections. The melting temperature of the mold flux can be controlled by adjusting the type and the content of the fusing agent so as to meet the requirements of different steel types.
Since the mold flux is a mixture and has no fixed melting point, the melting temperature thereof is defined by the hemispherical point temperature. The melting process of the mold flux can be characterized by obtaining the softening temperature, the hemispherical point temperature, and the flow temperature of the mold flux through a slag column method test, respectively.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The crystallizer casting powder is characterized by comprising the following components: CaO, SiO2、Al2O3、MgO、Na2O、Li2O, F and FC, the weight ratio of the components is:
CaO:16-26％；
SiO2:22-33％；
Al2O3:3-8％；
MgO:0-4％；
Na2O:6-12％；
Li2O:1.5-3％；
F:5-11％；
FC:2-7％。
2. the mold flux according to claim 1, wherein: the alkalinity of the crystallizer casting powder is 0.72-0.82%.
3. The mold flux according to claim 2, wherein: the water content of the crystallizer casting powder is 0-0.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111641697.7A CN114472823A (en) | 2021-12-29 | 2021-12-29 | Crystallizer casting powder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111641697.7A CN114472823A (en) | 2021-12-29 | 2021-12-29 | Crystallizer casting powder |
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| CN114472823A true CN114472823A (en) | 2022-05-13 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1824429A (en) * | 2005-02-25 | 2006-08-30 | 宝钢集团上海梅山有限公司 | High draw speed plate blank continuous casting low carbon steel crystallizer protective slag |
| WO2013139269A1 (en) * | 2012-03-22 | 2013-09-26 | 宝山钢铁股份有限公司 | Low-carbon steel fluoride-free continuous casting mold powder |
| CN104308104A (en) * | 2014-09-19 | 2015-01-28 | 中南大学 | Novel casting powder and application thereof |
| CN105642848A (en) * | 2016-02-23 | 2016-06-08 | 宝钢特钢有限公司 | Continuous casting mould fluxes for high-carbon steel |
| CN110918913A (en) * | 2019-11-13 | 2020-03-27 | 张家港荣盛特钢有限公司 | Covering slag for continuous casting high-carbon steel small square billet crystallizer |
-
2021
- 2021-12-29 CN CN202111641697.7A patent/CN114472823A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1824429A (en) * | 2005-02-25 | 2006-08-30 | 宝钢集团上海梅山有限公司 | High draw speed plate blank continuous casting low carbon steel crystallizer protective slag |
| WO2013139269A1 (en) * | 2012-03-22 | 2013-09-26 | 宝山钢铁股份有限公司 | Low-carbon steel fluoride-free continuous casting mold powder |
| CN104308104A (en) * | 2014-09-19 | 2015-01-28 | 中南大学 | Novel casting powder and application thereof |
| CN105642848A (en) * | 2016-02-23 | 2016-06-08 | 宝钢特钢有限公司 | Continuous casting mould fluxes for high-carbon steel |
| CN110918913A (en) * | 2019-11-13 | 2020-03-27 | 张家港荣盛特钢有限公司 | Covering slag for continuous casting high-carbon steel small square billet crystallizer |
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