CN113399630A - Function protection material for continuous casting crystallizer special for small square billet ultrahigh pulling speed - Google Patents
Function protection material for continuous casting crystallizer special for small square billet ultrahigh pulling speed Download PDFInfo
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- CN113399630A CN113399630A CN202110658076.3A CN202110658076A CN113399630A CN 113399630 A CN113399630 A CN 113399630A CN 202110658076 A CN202110658076 A CN 202110658076A CN 113399630 A CN113399630 A CN 113399630A
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- continuous casting
- protection material
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- speed
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- 239000000463 material Substances 0.000 title claims abstract description 47
- 238000009749 continuous casting Methods 0.000 title claims abstract description 37
- 238000005266 casting Methods 0.000 claims abstract description 22
- 238000002844 melting Methods 0.000 claims abstract description 19
- 230000008018 melting Effects 0.000 claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 239000006229 carbon black Substances 0.000 claims abstract description 8
- 239000010439 graphite Substances 0.000 claims abstract description 8
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 8
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 8
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 5
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 5
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 4
- 239000010436 fluorite Substances 0.000 claims abstract description 4
- 239000011521 glass Substances 0.000 claims abstract description 4
- 239000002241 glass-ceramic Substances 0.000 claims abstract description 4
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims abstract description 4
- 229910052808 lithium carbonate Inorganic materials 0.000 claims abstract description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 4
- 239000011775 sodium fluoride Substances 0.000 claims abstract description 4
- 235000013024 sodium fluoride Nutrition 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 3
- 229910000272 alkali metal oxide Inorganic materials 0.000 claims description 3
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000012546 transfer Methods 0.000 abstract description 8
- 239000002893 slag Substances 0.000 description 18
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 230000001681 protective effect Effects 0.000 description 8
- 239000007788 liquid Substances 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000003575 carbonaceous material Substances 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a function protection material for a continuous casting crystallizer special for small square billet ultrahigh pulling speed, which is prepared from the following materials: the high-temperature-resistant glass ceramic comprises 49.5% of pre-melting materials, 4% of fine glass powder, 13% of sodium carbonate, 12.0% of fluorite, 5% of sodium fluoride, 2% of lithium carbonate, 8.0% of carbon black and 6.5% of graphite carbon by weight; the pre-melting material comprises the following chemical components in percentage by weight: SiO22 28.0～33.0％，CaO 21.0～25.0％，Al2O3 6.0～9.0％，R2O 3.0～7.0％，F‑2.5 to 6.0 percent. The functional protection material for the special continuous casting crystallizer for the ultrahigh casting speed of the small square billet can ensure the uniform heat transfer and the consumption of the functional material under the condition of high casting speed continuous casting, thereby controlling the quality of bleed-out and the surface of a casting blank in the continuous casting production process.
Description
Technical Field
The invention relates to the technical field of steel making, in particular to a functional protection material for a continuous casting crystallizer special for ultrahigh pulling speed of small square billets.
Background
The high-speed continuous casting is an important direction of the traditional continuous casting development and is an effective means for fully exerting the advantages of continuous casting production. The small square billet continuous casting machine is common in China, but has low production capacity and poor technical and economic indexes, and becomes an urgent need for high-efficiency continuous casting in order to further develop the production potential of the continuous casting machine. The high-drawing-speed continuous casting is characterized in that a good casting blank is stably produced at a high drawing speed, and the casting blank is used as a key material for controlling a continuous casting process, so that the mold powder of the crystallizer is of great importance. The improvement of the drawing speed is important, the lubrication between a crystallizer copper pipe and a casting blank shell is important, the fluctuation of the liquid level of the crystallizer is aggravated, the consumption of crystallizer covering slag is reduced, the stability and the uniformity of a covering slag film between the crystallizer and the blank shell are reduced, the heat transfer of the crystallizer is uneven, the friction resistance is increased, the adhesion of the blank shell is caused, the probability of steel leakage is increased, the drawing speed is improved, the quality of the surface and the inner part of the casting blank is reduced, the quality of the steel leakage and the surface of the casting blank in the continuous casting production process is controlled, and the high-drawing-speed continuous casting is realized.
The continuous casting mold flux under the condition of high drawing speed needs to solve three problems:
1. along with the increase of the drawing speed, the heat flow passing through the crystallizer in unit time is increased, the original heat balance is broken, the blank shell at the outlet is thinned, the growth of the primary blank shell is uneven, and cracks, bulging and steel leakage are easily caused. The uniform growth of the primary blank shell is a precondition and key for obtaining a high-quality casting blank and avoiding steel leakage in the production process. In order to ensure the uniform growth of the primary blank shell, a liquid slag film formed by continuous casting mold flux ensures the transmission of heat and uniform heat transfer, so that the primary blank shell can grow uniformly;
2. along with the increase of the drawing speed, the steel passing amount is increased, the slag consumption of the covering slag is reduced, the lubricating effect is poor, the liquid slag flowing into the crystallizer and the solidified blank shell is difficult to meet the lubricating requirement of the crystallizer, and the adhesion steel leakage accident is easy to generate. In order to achieve the lubricating effect of the casting powder at high drawing speed, the casting powder with low viscosity, low melting point and high melting speed is adopted for the continuous casting powder to ensure the consumption and increase the lubricating property between the casting blank and the copper pipe of the crystallizer;
3. the continuous casting covering slag is added on the liquid level of the molten steel of the crystallizer, and after the continuous casting covering slag absorbs the heat of the molten steel and is melted to form liquid slag, and the liquid slag flows into a gap between a copper pipe and a solidified blank shell, a glassy membrane and a crystalline membrane are formed along with water-cooling crystallization and are respectively used for ensuring lubrication and preventing heat transfer. Under the condition of high-drawing-speed continuous casting, the balance point of heat transfer and lubrication between a crystallizer and a casting blank shell needs to be researched by combining with the actual on-site continuous casting process condition, so that not only is uniform heat transfer ensured, but also the consumption of the covering slag at the high-drawing speed is ensured.
Disclosure of Invention
The invention aims to provide a functional protection material for a special continuous casting crystallizer for ultrahigh casting speed of small square billets, which can control the quality of bleed-out and the surface of a casting blank in the continuous casting production process under the condition of high casting speed continuous casting.
In order to solve the technical problem, the invention provides a functional protection material for a special continuous casting crystallizer for ultrahigh pulling speed of small square billets, which is prepared from the following materials: the high-temperature-resistant glass ceramic comprises 49.5% of pre-melting materials, 4% of fine glass powder, 13% of sodium carbonate, 12.0% of fluorite, 5% of sodium fluoride, 2% of lithium carbonate, 8.0% of carbon black and 6.5% of graphite carbon by weight;
the pre-melting material comprises the following chemical components in percentage by weight: SiO22 28.0～33.0％，CaO 21.0～ 25.0％，Al2O36.0～9.0％，R2O 3.0～7.0％，F-2.5～6.0％。
Preferably, in the functional protection material, the binary alkalinity (CaO/SiO2) is 0.9-1.1, and the rest of the chemical components and the weight percentage thereof are as follows: 222.0 to 32.0 percent of SiOx, 23.0 to 33.0 percent of CaO, 34.0 to 6.0 percent of Al2O34, 8.5 to 11.0 percent of Na2O 8.5, 5.0 to 7.5 percent of F-, 3.0 to 5.0 percent of MgO, and 30.5 to 3 percent of Fe2O30.
Preferably, the melting point of the functional protection material is controlled at 1010-1050 ℃, and the viscosity is controlled at 0.1-0.2Pa & S.
The functional protective material for the special continuous casting crystallizer for the ultrahigh pulling speed of the small square billet ensures the uniform heat transfer and consumption of the functional material under the continuous casting at the high pulling speed by controlling the alkalinity of the protective slag to be 0.9-1.1, the melting point to be 1010-1050 ℃ and the viscosity to be 0.1-0.2 Pa.S, thereby controlling the quality of bleed-out and the surface of a casting blank in the continuous casting production process.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a function protection material for a continuous casting crystallizer special for small square billet ultrahigh pulling speed, which is prepared from the following materials: the high-temperature-resistant glass ceramic comprises 49.5% of a pre-melting material, 4% of fine glass powder, 13% of sodium carbonate, 12.0% of fluorite, 5% of sodium fluoride, 2% of lithium carbonate, 8.0% of carbon black and 6.5% of graphite carbon by weight;
the pre-melting material comprises the following chemical components in percentage by weight: SiO22 28.0～33.0％，CaO 21.0～ 25.0％，Al2O36.0～9.0％，R2O 3.0～7.0％，F-2.5～6.0％。
In the functional protection material, the binary alkalinity (CaO/SiO2) is 0.9-1.1, and the rest chemical components and the weight percentage content are as follows: 222.0 to 32.0 percent of SiOx, 23.0 to 33.0 percent of CaO, 34.0 to 6.0 percent of Al2O34, 8.5 to 11.0 percent of Na2O 8.5, 5.0 to 7.5 percent of F-, 3.0 to 5.0 percent of MgO, and 30.5 to 3 percent of Fe2O30.
The melting point of the functional protection material is controlled at 1010-.
1. Two existing 120t converters of a certain steel plant are provided with two CAS stations, one LF refining furnace and three 5-machine 5-flow continuous casting machines, wherein two R9m arcs, one R8m arc and the length of a crystallizer copper tube is 1000mm, in order to ensure the three requirements needed by the research and development of high-pulling-speed casting powder, the alkalinity R value of the high-pulling-speed casting powder is 0.9-1.1, the viscosity is controlled to be 0.1-0.2 Pa.S, the melting point is controlled to be 1010 and 1050 ℃, so as to ensure the heat transfer and consumption of the functional protection material, and the performance index selection results of the functional protection material are as follows:
watch (1)
In order to improve the melting uniformity of the functional protection material under the condition of lower alkalinity, in addition to adopting a pre-slag type, a plurality of combined materials are also used for reducing partial melting.
2. Effect of Components on functional protective Material
The change of the functional protective material is observed according to the components designed in the table (1), and the addition of the special component can also reduce the addition of the white alkali on the premise of meeting the melting temperature.
3. Carbon match pattern determination
Research shows that the addition of the carbonaceous material into the functional protective material can reduce the densification speed of the functional protective material, thereby inhibiting the sintering of the functional protective material, and in the carbonaceous material used in the test, the carbon black has better effect of reducing the densification speed than graphite, wherein the carbon black has the best effect, and the addition of 8% of carbon black and 6.5% of flake graphite is the flake graphite, so that the melting speed of the functional protective material can be effectively controlled.
Therefore, the carbon blending mode of the functional protection material is directly selected, specifically, the carbon blending mode is a mixed carbon blending mode of 8% of carbon black and 6.5% of flake graphite, so that the thickness of a molten slag layer in a crystallizer is 7-10mm through an actual production test, the consumption of the functional protection material per ton of steel is 0.25-0.3 Kg/ton of steel, and the production requirement can be met.
4, Experimental study
Through the research test, the special functional protection material for the small square billet with ultrahigh pulling speed is designed, and the main indexes are as follows:
watch (2)
5. Results of the experiment
According to the table components, the designed functional protection material can be well spread in a crystallizer, is uniformly melted, has active slag surface, generates few slag rings, has the thickness of a liquid slag layer of 7-10mm, consumes 0.25-0.3 Kg/ton of steel slag per ton, can realize high-drawing-speed continuous casting at the drawing speed of 4.5-6m/min, has good quality of the casting blank skin and the interior, and can meet the requirements.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the present specification and directly/indirectly applied to other related technical fields within the spirit of the present invention are included in the scope of the present invention.
Claims (3)
1. A function protection material for a continuous casting crystallizer special for small square billet ultrahigh pulling speed is characterized by being prepared from the following materials: the high-temperature-resistant glass ceramic comprises 49.5% of a pre-melting material, 4% of fine glass powder, 13% of sodium carbonate, 12.0% of fluorite, 5% of sodium fluoride, 2% of lithium carbonate, 8.0% of carbon black and 6.5% of graphite carbon by weight;
the pre-melting material comprises the following chemical components in percentage by weight: SiO22 28.0～33.0％，CaO 21.0～25.0％，Al2O3 6.0～9.0％，R2O 3.0～7.0％，F- 2.5～6.0％。
2. The functional protection material for the continuous casting crystallizer special for the ultrahigh billet casting speed as claimed in claim 1, wherein in the functional protection material, the binary basicity (CaO/SiO2) is 0.9-1.1, and the rest of the chemical components and the weight percentage content are as follows: SiO22 22.0～32.0％，CaO 23.0～33.0％，Al2O3 4.0～6.0％，Na2O 8.5～11.0％，F-5.0～7.5％，MgO 3.0～5.0％，Fe2O3 0.5～3％。
3. The functional protection material for the continuous casting mold special for the ultra-high billet casting speed as claimed in claim 2, wherein the melting point of the functional protection material is controlled at 1010-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110658076.3A CN113399630A (en) | 2021-06-15 | 2021-06-15 | Function protection material for continuous casting crystallizer special for small square billet ultrahigh pulling speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110658076.3A CN113399630A (en) | 2021-06-15 | 2021-06-15 | Function protection material for continuous casting crystallizer special for small square billet ultrahigh pulling speed |
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| Publication Number | Publication Date |
|---|---|
| CN113399630A true CN113399630A (en) | 2021-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110658076.3A Pending CN113399630A (en) | 2021-06-15 | 2021-06-15 | Function protection material for continuous casting crystallizer special for small square billet ultrahigh pulling speed |
Country Status (1)
| Country | Link |
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| CN (1) | CN113399630A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114082912A (en) * | 2021-11-15 | 2022-02-25 | 阳春新钢铁有限责任公司 | HPB300 square billet crack control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07178520A (en) * | 1993-12-22 | 1995-07-18 | Shinagawa Refract Co Ltd | Mold powder for continuous casting of steel |
| 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 |
| CN102527963A (en) * | 2012-02-22 | 2012-07-04 | 河南省西保冶材集团有限公司 | Continuous casting crystallizer protective material special for large round billet high-abrasion bearing steel |
| CN103381473A (en) * | 2013-07-23 | 2013-11-06 | 河南省西保冶材集团有限公司 | Special protecting material for oversized round billet made of medium carbon steel for continuous casting mold |
-
2021
- 2021-06-15 CN CN202110658076.3A patent/CN113399630A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07178520A (en) * | 1993-12-22 | 1995-07-18 | Shinagawa Refract Co Ltd | Mold powder for continuous casting of steel |
| 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 |
| CN102527963A (en) * | 2012-02-22 | 2012-07-04 | 河南省西保冶材集团有限公司 | Continuous casting crystallizer protective material special for large round billet high-abrasion bearing steel |
| CN103381473A (en) * | 2013-07-23 | 2013-11-06 | 河南省西保冶材集团有限公司 | Special protecting material for oversized round billet made of medium carbon steel for continuous casting mold |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114082912A (en) * | 2021-11-15 | 2022-02-25 | 阳春新钢铁有限责任公司 | HPB300 square billet crack control method |
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Application publication date: 20210917 |