CN115870466A - Continuous casting covering slag containing colemanite and application thereof - Google Patents
Continuous casting covering slag containing colemanite and application thereof Download PDFInfo
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Abstract
The invention discloses continuous casting covering slag containing colemanite and application thereof, wherein the raw material of the continuous casting covering slag containing the colemanite comprises the colemanite, and the mass fraction of the colemanite in the raw material is 1-25%. According to the method, borax is replaced by colemanite, and more borax can be added into the covering slag relatively, so that the phenomena that the covering slag bursts due to the fact that much borax is added and dust pollution is caused due to excessive dust are avoided. In addition, the adding amount of the colemanite is large, so that the covering slag contains B 2 O 3 Large amount of B 2 O 3 The casting powder has the advantages of effectively reducing the melting point of the casting powder, thinning a casting powder film, reducing the viscosity of the casting powder, having good filling fluidity and good lubricating property, and mainly replacing part of expensive materials, such as lithium carbonate, so that the cost of the casting powder is reduced on the premise of ensuring the performance of the casting powder.
Description
Technical Field
The invention relates to the technical field of covering slag, in particular to continuous casting covering slag containing colemanite and application thereof.
Background
The boron-containing raw material added into the continuous casting mold flux is borax generally, but the crystal water content of the borax is too high, and the borax loses water and bursts into powder in the process of changing aqueous solution into solid particles in a mold flux granulation tower, so that the phenomenon of powder formation is serious, and much dust is generated, so the adding amount is limited.
Along with the continuous implementation of the national emission standard, higher requirements are put forward on energy conservation and emission reduction and vehicle body light weight in the automobile industry, light weight materials are inevitably required to be researched and developed for realizing light weight of automobiles, and integration of multiple light materials such as high-strength steel, aluminum alloy and the like is the development direction of future automobile materials. The new generation of high-strength steel with ultrahigh strength, high formability and low density is an important research and development direction for global iron and steel enterprises.
Various indexes of the light dual-phase steel successfully produced by the saddle steel share all reach the design requirements, the elongation of the light dual-phase steel is obviously superior to that of the traditional 980MPa dual-phase steel, and the density is reduced by 5 percent. The light dual-phase steel is initiated globally, and represents that saddle steel reaches the leading level in the development of high-strength light automobile steel.
However, when saddle steel is used for producing the steel grade, the conventional continuous casting crystallizer covering slag frequently generates an alarm problem in a crystallizer expert system in the production process, the longitudinal crack and transverse depression rate of a continuous casting billet is as high as 60 percent, the production requirement cannot be met, and the development of the covering slag capable of meeting the production requirement of the steel grade is urgently needed.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide continuous casting mold flux containing colemanite and application of the continuous casting mold flux containing the colemanite in high-strength light dual-phase steel continuous casting.
The invention is realized by the following steps:
in a first aspect, the invention provides continuous casting mold flux containing colemanite, wherein the raw material comprises the colemanite, and the mass fraction of the colemanite in the raw material is 1-25%.
In an alternative embodiment, the mass fraction of colemanite in the starting material is 8 to 20%.
In an alternative embodiment, the raw materials of the mold flux comprise, by weight, 11-16 parts of fluorite, 2-5 parts of imported carbon black, 3-6 parts of earthy graphite, 58-65 parts of wollastonite, 5-9 parts of calcite, 0.5-3 parts of light-burned magnesite, 1-4 parts of bauxite, 1-4 parts of lithium carbonate, 8-20 parts of colemanite and 1-3 parts of polyvinyl alcohol.
In an optional embodiment, the mold flux comprises the following chemical components in percentage by weight: 35.0 to 39.0wt% of CaO and SiO 2 29.5～33.5wt％、Al 2 O 3 3～5wt％、Fe 2 O 3 0.3～1.5wt％、MgO 1.5～3wt％、Na 2 O 0～0.5wt％、F 5～8.5wt％、Li 2 O 0.8～1.5wt％、B 2 O 3 4-10 wt%, C3-6 wt% and unavoidable impurities.
In an optional embodiment, the mold flux comprises the following chemical components in percentage by weight: 36.0 to 39.0wt% of CaO and SiO 2 30.5～33.0wt％、Al 2 O 3 3～4wt％、Fe 2 O 3 0.3～0.7wt％、MgO 1.5～2wt％、Na 2 O 0～0.3wt％、F 5～6.5wt％、Li 2 O 1.0～1.5wt％、B 2 O 3 5-8 wt%, C3-5 wt% and inevitable impurities.
In an alternative embodiment, the binary basicity is in the range of 1.13 to 1.18.
In an alternative embodiment, the melting temperature is 1100-1130 ℃.
In an alternative embodiment, the viscosity at 1300 ℃ is from 0.11 to 0.14 pas.
In an alternative embodiment, the devitrification rate is less than 1%.
In a second aspect, the present invention provides a use of the continuous casting mold flux containing colemanite according to any one of the preceding embodiments for continuous casting of high-strength light-weight dual-phase steel.
The invention has the following beneficial effects:
according to the method, borax is replaced by the colemanite, and more quantity of the colemanite can be added into the covering slag relatively, so that the phenomenon that the covering slag bursts and dust is too much to cause dust pollution is avoided. In addition, it is hardThe added quantity of the borocalcite is large, so that the covering slag contains B 2 O 3 Large amount of B 2 O 3 The casting powder has the advantages of effectively reducing the melting point of the casting powder, thinning a casting powder film, reducing the viscosity of the casting powder, having good filling fluidity and good lubricating property, and mainly replacing part of expensive materials, such as lithium carbonate, so that the cost of the casting powder is reduced on the premise of ensuring the performance of the casting powder.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The high-strength light-weight dual-phase steel mentioned in the application has the drawing speed of 1-1.15m/min, and the main components are as follows:
| element(s) | C | Si | Mn | Al |
| Control range wt% | 0.16-0.17 | 1.2-1.5 | 1.9-2.1 | 0.02-0.05 |
From the components, firstly, the silicon content in the steel is higher than the range within 0.4% of that of conventional carbon steel, the thermal resistance of a continuous casting blank shell is higher, the blank shell of a primary continuous casting blank is very thin, which is also the root cause of the alarm of a crystallizer expert system in the continuous casting process, and secondly, the manganese content in molten steel is too high and is higher than the range within 1.6% of that of the conventional steel, which indicates that the blank shell has very high strength, and if the liquidity of liquid slag is poor, the filling capacity of protective slag in a channel between the blank shell and a copper plate is weak, the slag film has uneven thickness and is easy to generate the phenomenon of uneven consumption, which is the reason for generating longitudinal cracks; in addition, if the slag film of the covering slag is poor in lubrication, the friction force between the casting blank and the crystallizer is easily increased, and the transverse cracking tendency of the slab is increased.
The inventor researches the characteristics of the steel grade and the continuous casting process conditions and designs the performance index and the components of the covering slag in a targeted manner.
The embodiment of the application provides continuous casting covering slag containing colemanite, which comprises the raw material of the colemanite, wherein the mass fraction of the colemanite in the raw material is 1-25%.
According to the method, borax is replaced by the colemanite, and more quantity of the colemanite can be added into the covering slag relatively, so that the phenomenon that the covering slag bursts and dust is too much to cause dust pollution is avoided. In addition, the adding amount of the colemanite is large, so that the covering slag contains B 2 O 3 Large amount of B 2 O 3 The casting powder has the advantages of effectively reducing the melting point of the casting powder, thinning a casting powder film, reducing the viscosity of the casting powder, having good filling fluidity and good lubricating property, and mainly replacing part of expensive materials, such as lithium carbonate, so that the cost of the casting powder is reduced on the premise of ensuring the performance of the casting powder.
In some alternative embodiments of the present application, the mass fraction of colemanite in the raw material is 8 to 20%.
In some optional embodiments of the present application, the raw materials of the mold flux include, by weight, 11 to 16 parts of fluorite, 2 to 5 parts of imported carbon black, 3 to 6 parts of earthy graphite, 58 to 65 parts of wollastonite, 5 to 9 parts of calcite, 0.5 to 3 parts of light-burned magnesia, 1 to 4 parts of bauxite, 1 to 4 parts of lithium carbonate, 8 to 20 parts of colemanite, and 1 to 3 parts of polyvinyl alcohol.
Because blank shell and copper gap are less in the high-strength steel production process, for forming even nascent blank shell, most avoid the slag bar to produce and influence the liquid slag inflow uniformity, consequently, need to use compound carbon blending technique, ensure the molten three-layer construction of covering slag, for guaranteeing that the covering slag melts fast simultaneously, join in marriage carbon should not be too high, must quote the less import carbon black of granule, guarantee its skeleton effect, control melting speed.
In order to ensure the strength of the casting powder particles, a binder is required, but the binder containing Na elements such as sodium carboxymethyl cellulose, dextrin and the like cannot be selected for ensuring the lubricating effect, so that the scheme particularly selects polyvinyl alcohol as the binder.
In some optional embodiments of the present application, the mold flux comprises the following chemical components in percentage by weight: 35.0 to 39.0wt% of CaO and SiO 2 29.5～33.5wt％、Al 2 O 3 3～5wt％、Fe 2 O 3 0.3～1.5wt％、MgO 1.5～3wt％、Na 2 O 0～0.5wt％、F 5～8.5wt％、Li2O 0.8～1.5wt％、B 2 O 3 4-10 wt%, C3-6 wt% and inevitable impurities.
It should be noted that, in order to ensure that the mold flux has good lubricating effect, the introduction of Na element is avoided as much as possible in the component design of the mold flux, the Na element is combined with calcium oxide to easily form melilite, the melilite is easily crystallized to have negative influence on the lubricating effect, and therefore the Na element is not introduced into the mold flux as much as possible. In this embodiment, lithium carbonate and colemanite are used in a matching manner, so that the use of other sodium-containing raw materials is reduced as much as possible, and the introduction of sodium ions in the mold flux is reduced.
In some optional embodiments of the present application, the mold flux comprises the following chemical components in percentage by weight: 36.0 to 39.0 weight percent of CaO and SiO 2 30.5～33.0wt％、Al 2 O 3 3～4wt％、Fe 2 O 3 0.3～0.7wt％、MgO 1.5～2wt％、Na 2 O 0～0.3wt％、F 5～6.5wt％、Li 2 O 1.0～1.5wt％、B 2 O 3 5-8 wt%, C3-5 wt% and inevitable impurities.
In some alternative embodiments of the present application, the binary basicity is in the range of 1.13 to 1.18.
In the embodiment, the binary alkalinity is reduced, crystals precipitated from a slag film are reduced, the number of glass bodies is increased, the casting blank can be lubricated, the alkalinity is reduced, the heat transfer of a blank shell is facilitated, the formation of a continuous casting primary blank shell is quicker, and the alarm problem of a crystallizer expert system is avoided; however, considering that the steel grade is easy to have longitudinal crack defects, the alkalinity is designed to be too low, the casting blank is easy to have longitudinal crack defects, the alkalinity is too high, the solid slag film thickness is increased, and the alarm problem is easily caused, and the alkalinity is designed to be 1.13-1.18 most reasonably through laboratory analysis.
In some alternative embodiments of the present application, the melting temperature is 1100-1130 ℃.
In the embodiment, the melting point is reduced, and a lower melting point needs to be designed for improving the rapid melting capacity of the casting powder, improving the consumption of ton steel casting powder and avoiding the alarm of a crystallizer expert system. To ensure a lower melting point, lithium oxide and colemanite are added to the mold flux. The conventional measure for lowering the melting point is to introduce industrial soda ash and NaF 2 Materials such as cryolite and the like reduce the melting point, but the materials contain Na element, so that substances with high melting points such as nepheline, calcium-aluminum yellow feldspar and the like are easy to produce in the crystallization process after the casting powder is melted, the lubricating effect of the casting powder is deteriorated, and the alarm of a crystallizer expert system is triggered. The lithium oxide has a good effect of reducing the melting point, and can improve the slag film form and refine crystal grains, the liquid protective slag can form fine and uniform crystals in the cooling process, and the uniform heat transfer control capability of the protective slag is improved, so that the alarm problem and the longitudinal crack defect in the continuous casting process are avoided, but the price of lithium carbonate is too high, if a large amount of protective slag is introduced, the cost is inevitably too high, and the market competitive advantage of the product is lost; colemanite belongs to an ore material, is different from borax, has low melting point, is easy to generate white balls in a high-temperature environment of a granulation tower, has high effective yield of boron oxide selected from colemanite, and has specific ratio of boron oxide to boraxLithium oxide has better melting point reduction effect, and in addition, the colemanite has more price advantage than borax and lithium carbonate. Therefore, the lithium carbonate and the colemanite are designed to be matched for use, and the components of the protective slag are controlled to contain 0.8 to 1.5 weight percent of Li 2 O and 4 to 10wt% of B 2 O 3 And the melting point is ensured to be in the range of 1100-1130 ℃.
In some alternative embodiments of the present application, the viscosity at 1300 ℃ is from 0.11 to 0.14 Pa-s.
In the embodiment, the viscosity is reduced, the strength of the steel type continuous casting billet shell is high, and the gap between the billet shell and the copper plate is small, so that the friction force of the billet shell on the copper plate is large, and the lubricating capability of the casting powder needs to be improved. Considering that the continuous casting billet withdrawal speed is only 1-1.15m/min, the viscosity cannot be too low, if the viscosity is too low, the liquid slag consumption is too high, the non-uniform phenomenon is easy to cause in the process of forming a solid slag film, and the longitudinal crack and the transverse crack are easy to cause, therefore, the viscosity is designed to be 0.11-0.14 Pa.S.
In some alternative embodiments of the present application, the devitrification rate is less than 1%.
A further embodiment of the present application provides a use of the continuous casting mold flux containing colemanite according to any one of the preceding embodiments in continuous casting of high-strength light-weight dual-phase steel.
The features and properties of the present invention are described in further detail below with reference to examples.
The first embodiment is as follows:
a continuous casting powder for high-strength light-weight dual-phase steel comprises: the weight percentages of the fluorite powder, imported carbon black, earthy graphite powder, wollastonite powder, calcite powder, light calcined magnesite powder, alumine powder, lithium carbonate, hard boron calcium stone powder and polyvinyl alcohol are respectively 13%, 2%, 5%, 55%, 6%, 1%, 3%, 10% and 2%.
The continuous casting covering slag for high-strength light-weight dual-phase steel comprises the following components in percentage by weight: caO:37.2% of SiO 2 ：31.7％，Al 2 O 3 ：3.5％，Fe 2 O 3 ：0.6％，MgO：1.9％，Na 2 O：0.0％，F：5.8％，Li 2 O：1.2％，B 2 O 3 5%, C:5% of binary basicity (CaO/SiO) 2 Mass percent) 1.17, melting point: viscosity at 1110 ℃,1300 ℃ of 0.12Pa · S, crystallization rate: 0 percent.
The test is carried out on saddle steel, the test is carried out in the last two furnaces, then the test is carried out in the last half casting time, and finally the test is carried out in the whole casting time, the model A of the test casting powder is DP980, the section is 230 x 1250, and the pulling speed is 1.1m/min. The pouring is carried out in 3 times. In the test process, the A-type continuous casting covering slag has good spreadability and fluidity in the crystallizer, the total slag layer is 50-70mm, the thickness of liquid slag is 10-13mm, the liquid slag layer and the powder slag layer can be well isolated, the surface flame of the crystallizer is moderate, the slag consumption is moderate and is 0.5-0.55kg/t on average, the good lubricating effect is ensured, the slag strips are small in the test process, the crystallizer has no alarm condition, the surface of a test casting blank is smooth and free of defects, and the test purpose is achieved.
Example two:
a continuous casting powder for high-strength light-weight dual-phase steel comprises: the weight percentages of the fluorite powder, imported carbon black, earthy graphite powder, wollastonite powder, calcite powder, light calcined magnesite powder, alunite powder, lithium carbonate, hard boron calcium limestone powder and polyvinyl alcohol are respectively 14%, 2.5%, 3.5%, 52%, 5%, 1.5%, 3%, 2%, 15% and 1.5%.
The continuous casting covering slag for high-strength light-weight dual-phase steel comprises the following components in percentage by weight: caO:36.9% of SiO 2 ：32.1％，Al 2 O 3 ：3.5％，Fe 2 O 3 ：0.5％，MgO：1.6％，Na 2 O：0.2％，F：6.2％，Li 2 O：0.9％，B 2 O 3 7.5 percent, C:4% of binary basicity (CaO/SiO) 2 Mass percent) 1.15, melting point: 1125 ℃,1300 ℃ viscosity 0.11Pa · S, crystallization rate: 0 percent.
The test is carried out in a certain domestic plant, the test is carried out in the last two furnaces, then the test is carried out in the last half casting time, finally the test is carried out in the whole casting time, the model B of the test casting powder is tested, the test casting steel grade is DP980, the section is 230 x 1300, and the pulling speed is 1.1m/min. The pouring is carried out in 3 times. In the test process, the B-type continuous casting covering slag has good spreadability and fluidity in the crystallizer, the total slag layer is 50-70mm, the thickness of liquid slag is 9-12mm, the liquid slag layer and the powder slag layer can be well isolated, the surface flame of the crystallizer is moderate, the slag consumption is moderate and is 0.55-0.6kg/t on average, the good lubricating effect is ensured, the slag strips are small in the test process, no alarm condition occurs in the crystallizer, the surface of a test casting blank is smooth and free of defects, and the test purpose is achieved.
Comparative example one:
a continuous casting mold flux for high-strength light-weight dual-phase steel comprising: 14% of fluorite powder, 2% of imported carbon black, 4% of earthy graphite powder, 4% of wollastonite powder, 8% of soda ash, calcite powder, light calcined magnesite powder, bauxite powder, lithium carbonate, hard boron calcium limestone powder and polyvinyl alcohol in percentage by weight, wherein the polyvinyl alcohol is used for the coating of the coating.
The continuous casting covering slag for high-strength light-weight dual-phase steel comprises the following components in percentage by weight: caO:38.1% of SiO 2 ：29.3％，Al 2 O 3 ：3.5％，Fe 2 O 3 ：0.6％，MgO：1.9％，Na 2 O：2.4％，F：6.2％，Li 2 O：1.2％，B 2 O 3 4%, C:5% of binary basicity (CaO/SiO) 2 Mass percent) 1.3, melting point: 1140 ℃, viscosity at 1300 ℃ of 0.13Pa · S, crystallization rate: 30 percent.
The test was carried out on saddle steel, first in the last four-furnace test, test mold flux type C, test cast steel grade DP980, section 230 x 1250, pull rate 1.0m/min. In the test process, the C-type continuous casting covering slag has good spreadability and fluidity in a crystallizer, the total slag layer is 50-70mm, the thickness of liquid slag is 8-11mm, the molten steel and powder slag layer can be well isolated, the surface flame of the crystallizer is moderate, the slag consumption is moderate and is 0.5-0.53kg/t on average, a good lubricating effect is ensured, slag strips are generated quickly in the test process, 3 alarm accidents are caused, the surface of a test casting blank generates bonding type vibration marks due to the fact that the alarm pulling speed is reduced to 0.1m/min, the test effect is poor compared with A/B, and the main reason is that the production of the slag strips is quick due to the fact that soda is added, yellow feldspar in a liquid slag film is increased, and the alkalinity and the crystallization rate are high.
Comparative example two:
a continuous casting mold flux for high-strength light-weight dual-phase steel comprising: 15% of fluorite powder, 3% of imported carbon black, 3% of earthy graphite powder, 2% of wollastonite powder, 4% of calcite powder, 42% of light calcined magnesite powder, 3% of aluminous powder, 3% of lithium carbonate, 3% of hard boron calcium stone powder and 3% of polyvinyl alcohol.
The continuous casting covering slag for high-strength light-weight dual-phase steel comprises the following components in percentage by weight: caO:36.1% of SiO 2 ：33.8％，Al 2 O 3 ：3.9％，Fe 2 O 3 ：0.7％，MgO：2.6％，Na 2 O：0.0％，F：6.5％，Li 2 O：1.9％，B 2 O 3 9%, C:4.5%, binary basicity (CaO/SiO) 2 Mass percent) 1.07, melting point: 1070 ℃, viscosity at 1300 ℃ of 0.09Pa & S, crystallization rate: 0 percent.
The test was carried out on saddle steel, and on the last four-furnace test, the mold powder type E was tested, the cast steel type DP980, the section 230 × 1250, and the casting speed 1.15m/min. In the test process, the E-type continuous casting covering slag has good spreadability and fluidity in the crystallizer, the total slag layer is 50-70mm, the liquid slag thickness is 6-8mm, the liquid slag layer is thin, the surface flame of the crystallizer is large, the slag consumption is moderate and average at 0.55-0.6kg/t, the consumption is large, the slag strips are few in the test process, the crystallizer does not give an alarm, however, the surface of a casting blank is not smooth after the inspection of the casting blank, the vibration mark is deep, the longitudinal crack and transverse crack rate is as high as 10%, the test effect is not ideal, and the main reason is that Li is added 2 O and B 2 O 3 More, resulting in lower melting point and viscosity and large consumption of liquid slag.
Comparative example three
The covering slag is designed according to foreign covering slag components, and the covering slag comprises the following components: fluorite powder, imported carbon black, soda ash, earthy graphite powder, wollastonite powder, calcite powder, caustic calcined magnesite powder, bauxite powder and sodium carboxymethylcellulose, wherein the weight percentages of the fluorite powder, the imported carbon black, the soda ash, the earthy graphite powder, the wollastonite powder, the calcite powder, the caustic calcined magnesite powder, the bauxite powder and the sodium carboxymethylcellulose are respectively 15%, 2%, 7%, 4%, 53%, 13%, 1%, 3% and 2%.
The components and the accurate content are respectively as follows: caO:39.5 percent，SiO 2 ：28.3％，Al 2 O 3 ：4.3％，Fe 2 O 3 ：0.6％，MgO：1.7％，Na 2 O:4.5%, F:6.7%, C:5% of binary basicity (CaO/SiO) 2 Mass percent) 1.38, melting point: viscosity at 1150 ℃,1300 ℃ of 0.10Pa · S, crystallization rate: 100 percent.
The test was carried out on saddle steel, and in the last four-furnace test, the mold powder type E was tested, the cast steel type DP980, the section 230 × 1250, and the casting speed 1.1m/min. In the test process, the E-type continuous casting covering slag has good spreadability and fluidity in the crystallizer, the total slag layer is 50-70mm, the liquid slag thickness is 12-15mm, the surface flame of the crystallizer is moderate, the slag consumption is moderate and is 0.38-0.44kg/t on average, good lubricating effect is ensured, slag strips are generated quickly in the test process, an alarm frequently occurs in the crystallizer, the surface of a test casting blank generates bonding type vibration marks due to the fact that the pulling speed of the alarm is reduced to 0.1m/min, and the test effect is poor. The main reasons are high alkalinity, fast slag strip generation, liquid slag can not be consumed through a gap between the crystallizer and the copper plate, crystallization rate is high, and poor lubrication is caused.
Comparative example four
Comparative example design of a continuous casting mold flux includes: 12% of fluorite powder, 3% of imported carbon black, 3% of earthy graphite powder, 6% of wollastonite powder, 4% of calcite powder, 64.5% of light calcined magnesite powder, 6% of aluminous powder, 1.5% of lithium carbonate, 2% of hard boron calcium carbonate powder and 1% of polyvinyl alcohol.
The components and the accurate content are respectively as follows: caO:36.9% of SiO 2 ：33.6％，Al 2 O 3 ：4.2％，Fe 2 O 3 ：0.7％，MgO：2.1％，Na 2 O：0.0％，F：5.5％，Li 2 O：0.5％，B 2 O 3 2%, C:4.5%, binary basicity (CaO/SiO) 2 Mass percent) 1.1, melting point: 1140 ℃, viscosity at 1300 ℃ of 0.13Pa · S, crystallization rate: 40 percent.
The test was carried out on saddle steel, and in the last four-furnace test, the mold powder type F was tested, the cast steel type DP980, the section 230 × 1250, and the casting speed 1.0m/min. In the test process, the F-type continuous casting covering slag has good spreadability and fluidity in the crystallizer, the total slag layer is 50-70mm, the thickness of liquid slag is 12-15mm, the liquid slag layer and the powder slag layer can be well isolated, the surface flame of the crystallizer is moderate, the slag consumption is moderate and average at 0.42-0.50kg/t, the slag strips are large in the test process, an expert system of the crystallizer gives an alarm, the column rate is up to 30%, and the test effect is poor.
Therefore, the continuous casting mold flux for high-strength light dual-phase steel provided by the embodiment of the application has better performances than the continuous casting mold flux for high-strength light dual-phase steel in the comparative example, and the continuous casting mold flux for high-strength light dual-phase steel provided by the embodiment of the application can effectively ensure the smooth casting process of the high-strength light dual-phase steel and prevent the crack defects.
In conclusion, the continuous casting powder for high-strength light-weight dual-phase steel is applied to the continuous casting of the high-strength light-weight dual-phase steel, and can effectively overcome the defects of longitudinal crack and transverse crack caused by thin steel primary blank shell, high blank shell strength and large blank shell and copper plate friction force in the continuous casting production process of the high-strength light-weight dual-phase steel at present.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The continuous casting covering slag containing the colemanite is characterized in that the raw material comprises the colemanite, and the mass fraction of the colemanite in the raw material is 1-25%.
2. The continuous casting mold flux containing colemanite according to claim 1, wherein the mass fraction of colemanite in the raw material is 8 to 20%.
3. The continuous casting mold flux containing colemanite as defined in claim 1, wherein the raw materials of the mold flux comprise, in parts by weight, 11 to 16 parts of fluorite, 2 to 5 parts of imported carbon black, 3 to 6 parts of earthy graphite, 58 to 65 parts of wollastonite, 5 to 9 parts of calcite, 0.5 to 3 parts of light burned magnesite, 1 to 4 parts of bauxite, 1 to 4 parts of lithium carbonate, 8 to 20 parts of colemanite, and 1 to 3 parts of polyvinyl alcohol.
4. The colemanite-containing continuous casting mold flux according to claim 1, characterized in that the mold flux comprises the following chemical components in percentage by weight: 35.0 to 39.0wt% of CaO and SiO 2 29.5～33.5wt％、Al 2 O 3 3～5wt％、Fe 2 O 3 0.3～1.5wt％、MgO 1.5～3wt％、Na 2 O0～0.5wt％、F 5～8.5wt％、Li 2 O 0.8～1.5wt％、B 2 O 3 4-10 wt%, C3-6 wt% and unavoidable impurities.
5. The colemanite-containing continuous casting mold flux according to claim 1, wherein the mold flux comprises the following chemical components in percentage by weight: 36.0 to 39.0 weight percent of CaO and SiO 2 30.5～33.0wt％、Al 2 O 3 3～4wt％、Fe 2 O 3 0.3～0.7wt％、MgO 1.5～2wt％、Na 2 O0～0.3wt％、F 5～6.5wt％、Li 2 O 1.0～1.5wt％、B 2 O 3 5-8 wt%, C3-5 wt% and inevitable impurities.
6. The colemanite-containing continuous casting powder according to claim 1, wherein the binary basicity is 1.13 to 1.18.
7. The continuous casting mold flux containing colemanite according to claim 1, wherein the melting temperature is 1100 to 1130 ℃.
8. The colemanite-containing continuous casting mold flux according to claim 1, wherein the viscosity at 1300 ℃ is 0.11 to 0.14 Pa-s.
9. The continuous casting mold flux containing colemanite according to claim 1, wherein a crystallization rate is less than 1%.
10. Use of the continuous casting mold flux containing colemanite according to any one of claims 1 to 9 for continuous casting of high-strength light-weight dual-phase steel.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211602664.6A CN115870466A (en) | 2022-12-13 | 2022-12-13 | Continuous casting covering slag containing colemanite and application thereof |
| PCT/CN2023/093842 WO2024124792A1 (en) | 2022-12-13 | 2023-05-12 | Colemanite-containing continuous casting mold powder and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211602664.6A CN115870466A (en) | 2022-12-13 | 2022-12-13 | Continuous casting covering slag containing colemanite and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115870466A true CN115870466A (en) | 2023-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211602664.6A Pending CN115870466A (en) | 2022-12-13 | 2022-12-13 | Continuous casting covering slag containing colemanite and application thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115870466A (en) |
| WO (1) | WO2024124792A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116622430A (en) * | 2023-04-28 | 2023-08-22 | 北京天力创玻璃科技开发有限公司 | Glass lubricant for vacuum isothermal forging process and application thereof |
-
2022
- 2022-12-13 CN CN202211602664.6A patent/CN115870466A/en active Pending
-
2023
- 2023-05-12 WO PCT/CN2023/093842 patent/WO2024124792A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116622430A (en) * | 2023-04-28 | 2023-08-22 | 北京天力创玻璃科技开发有限公司 | Glass lubricant for vacuum isothermal forging process and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024124792A1 (en) | 2024-06-20 |
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