CN112157234A - Ultra-low carbon crystallizer casting powder for automobile sheet continuous casting and preparation method thereof - Google Patents
Ultra-low carbon crystallizer casting powder for automobile sheet continuous casting and preparation method thereof Download PDFInfo
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- 238000005266 casting Methods 0.000 title claims abstract description 58
- 238000009749 continuous casting Methods 0.000 title claims abstract description 55
- 239000000843 powder Substances 0.000 title claims abstract description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title description 7
- 239000002893 slag Substances 0.000 claims abstract description 52
- 239000000463 material Substances 0.000 claims abstract description 33
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 22
- 239000000126 substance Substances 0.000 claims abstract description 22
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 20
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 20
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 20
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 20
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 20
- 238000002844 melting Methods 0.000 claims abstract description 18
- 230000008018 melting Effects 0.000 claims abstract description 18
- 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 17
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 17
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 17
- 239000012535 impurity Substances 0.000 claims abstract description 14
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims abstract description 8
- 239000002002 slurry Substances 0.000 claims abstract description 8
- 239000007921 spray Substances 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000011230 binding agent Substances 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000005469 granulation Methods 0.000 claims abstract description 4
- 230000003179 granulation Effects 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims abstract description 4
- 238000005303 weighing Methods 0.000 claims abstract description 4
- 229910000272 alkali metal oxide Inorganic materials 0.000 claims description 13
- 230000004907 flux Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000010436 fluorite Substances 0.000 claims description 5
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 3
- 229910001570 bauxite Inorganic materials 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 239000006229 carbon black Substances 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000012856 weighed raw material Substances 0.000 claims description 3
- 239000010456 wollastonite Substances 0.000 claims description 3
- 229910052882 wollastonite Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 21
- 239000010959 steel Substances 0.000 abstract description 21
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 238000005461 lubrication Methods 0.000 abstract description 10
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 238000007920 subcutaneous administration Methods 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 description 47
- 230000008569 process Effects 0.000 description 11
- 238000009628 steelmaking Methods 0.000 description 11
- 230000001050 lubricating effect Effects 0.000 description 7
- 230000001681 protective effect Effects 0.000 description 7
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000002425 crystallisation Methods 0.000 description 5
- 230000008025 crystallization Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 238000004321 preservation Methods 0.000 description 5
- 238000005245 sintering Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 239000002436 steel type Substances 0.000 description 3
- 230000002087 whitening effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005499 meniscus Effects 0.000 description 2
- 238000012552 review Methods 0.000 description 2
- 239000011378 shotcrete Substances 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910017108 Fe—Fe Inorganic materials 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- INJRKJPEYSAMPD-UHFFFAOYSA-N aluminum;silicic acid;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O INJRKJPEYSAMPD-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007630 basic procedure Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010273 cold forging Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000010443 kyanite Substances 0.000 description 1
- 229910052850 kyanite Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides an ultra-low carbon crystallizer casting powder for continuous casting of automobile plates, which comprises 33 percent of chemical components<CaO<41%，35.5%<SiO2<43.5%，1%<Al2O3<6.0%，0<MgO<4%,0<Fe2O3<3%，3.5%<F‑<9.5%，1.5%<R2O<7.5%，1.0%<C<3 percent, and the rest components are impurities. The manufacturing method comprises the steps of weighing raw materials, mixing, granulating, melting in an electric furnace, and air cooling to obtain a pre-melted material; crushing and grinding the pre-melted material, adding a carbonaceous material, adding normal-temperature water and a binder into a ball mill, and finely grinding to prepare slurry; and (4) feeding the slurry into a spray particle drying tower for spray granulation and drying. The invention improves the lubrication of the casting blank, reduces the incidence of the depression and slag inclusion on the surface of the casting blank, prevents the recarburization of molten steel or the casting blank caused by the covering slag, improves the surface and subcutaneous quality of the casting blank, is beneficial to the smooth continuous casting and improves the production efficiency of the continuous casting.
Description
Technical Field
The invention relates to a protective slag of a continuous casting crystallizer, in particular to a protective slag of an ultra-low carbon crystallizer for continuous casting of an automobile sheet, and also relates to a preparation method of the protective slag.
Background
In recent years, ultra-low carbon steel has been rapidly developed in the international range due to its excellent properties, and gradually becomes a new generation of steel for stamping following boiling steel and aluminum killed steel, which is a national mark of the production level of steel plates for automobiles and represents the highest level and development direction of the production of stamped steel plates in the world. The ultra-low carbon steel mainly comprises the following components: ultra-low carbon, microalloying and pure steel. The production of ultra-low carbon steel in China is still in the primary stage at present, and because of the limited factors in many aspects such as smelting conditions, continuous casting process and the like, the production of the ultra-low carbon steel faces serious challenges, in particular to continuous casting protective slag which directly influences the surface quality of a casting blank. The continuous casting covering slag is used as a medium for interaction between a crystallizer and a casting blank and is of great importance to the continuous casting process. In the continuous casting production process of ultra-low carbon steel, the melting point and viscosity of the covering slag are further increased along with the adsorption of aluminum oxide impurities in molten steel in the covering slag, so that the lubricating property of the covering slag is insufficient to harm the smooth continuous casting. Because the continuous casting covering slag contains a certain amount of carbonaceous materials, the surface carburization of a casting blank and the recarburization of molten steel in a crystallizer are easily caused, and the surface quality of an ultra-low carbon steel casting blank is deteriorated.
Disclosure of Invention
The invention aims to solve the technical problem of providing the ultra-low carbon crystallizer casting powder for the continuous casting of the automobile plate, which can effectively coordinate the lubricating of the casting blank by the casting powder in the continuous casting process of the ultra-low carbon plate blank, is beneficial to coordinating the contradiction between the melting point and the lubricating after impurities are adsorbed in the continuous casting process of the automobile plate and the increase of the viscosity, and is beneficial to the smooth continuous casting; the casting blank lubricating method has the advantages that the casting blank lubricating is improved, meanwhile, the depression and slag inclusion on the surface of the casting blank are reduced, the recarburization of molten steel or the casting blank caused by the casting powder is prevented, the surface and subcutaneous quality of the casting blank is improved, and the production efficiency of continuous casting is improved. The invention also provides a preparation method of the covering slag.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the ultra-low carbon crystallizer casting powder for continuous casting of the automobile sheet comprises the following chemical components in percentage by weight:
33%<CaO<41%，35.5%<SiO2<43.5%，1%<Al2O3<6.0%，0<MgO<4% , 0<Fe2O3<3%，3.5%<F-<9.5%，1.5%<R2O<7.5%，1.0%<C<3% and the balance impurities, wherein R2O is an alkali metal oxide.
The R is2O is an alkali metal oxide, mainly Na2O, also including the incorporation of various materials into the tapesAmount of K2O。
The alkalinity CaO/SiO20.75 to 1.15.
The invention provides a continuous casting crystallizer casting powder chemical composition action mechanism and the limit of the addition thereof as follows:
CaO: is the main component of the mineral phase of the gunite in the covering slag, and has wide source and low cost. In chemical analysis, Ca element brought by calcium fluoride in fluorite is converted into CaO in corresponding weight percentage. Because CaO is the main component of the crystalline phase, and the covering slag needs to be crystallized quickly at a meniscus to control heat transfer, the weight percentage of the components needs to be higher, and the excessively high CaO causes the initial crystallization capacity of the covering slag to be excessively strong, improves the crystallization temperature of the covering slag, deteriorates lubrication to a certain extent, and is determined to be in the following weight percentage range through theoretical design and experimental verification: 33% < CaO < 41%.
SiO2: the main acidic oxide in the casting powder and one of main components of the gunite are important network structure formers in the casting powder, and react with the alkaline oxide to generate a low-melting-point compound so as to reduce the melting point of the casting powder. The melting point and crystallization property of the covering slag can be adjusted by controlling the addition amount of the SiO2The thickness of the liquid slag film near the meniscus can be maintained at a certain level, and the lubrication is improved. But too high SiO2The crystallization property of the covering slag is easy to weaken, and through theoretical design and experiments, the invention finally uses SiO2The content is controlled to be 35.5 percent<SiO2<43.5% range.
F-: is the main fluxing agent in the casting powder and is also one of the main components for generating the kyanite. The additive is added in a certain range, so that the high-temperature viscosity of the casting powder can be reduced, the consumption of the casting powder is increased, and the lubrication is improved to a certain extent. If the amount of the additive is too much when the basicity is high, the precipitation of a high-melting-point phase is easily promoted, which is unfavorable for lubrication. F in the casting powder-The Ca in the fluorite is converted into CaO with the corresponding weight percentage during chemical composition analysis. Through theoretical design and experiments, the invention uses F-The content control range is 3.5 percent<F-<9.5%。
Al2O3+MgO：Al2O3The amphoteric oxide belongs to a network structure forming body in the alkaline slag and can adjust the crystallization property of the slag within a certain range. When the content exceeds a certain range, the viscosity of the slag is easily increased greatly, lubrication is not facilitated, and the content of the slag is not too high because the melting point of the slag is high and a high-melting-point compound is easily generated in some cases. MgO belongs to alkaline earth metal oxide, and part of CaO in the casting powder is replaced, so that the lubricating property of the casting powder can be improved, but the MgO and Al are mixed2O3Similarly, MgO itself has a high melting point and is easily combined with other components to form a high melting point compound, and when the content is high, the slag turning temperature can be increased, and the lubrication of a casting blank is deteriorated. Therefore, through theoretical design and experiments, the invention uses Al2O3The content of + MgO is controlled as follows: 1.5 percent<Al2O3+MgO<6.0%。
Fe2O3: has strong oxidizing property, and Fe should be added2O3The amount of the Fe is controlled in a lower range, oxygen enrichment to molten steel is avoided, and through theoretical design and experiments, the Fe-Fe alloy is prepared by using Fe2O3The weight percentage is controlled in the range of less than 3%.
C: the protective slag has the function of skeleton isolation, is mainly used for adjusting the melting speed of the protective slag and preventing the generation of over sintering. The invention controls the content of C within the range of 1-3%.
The invention discloses a preparation method of ultra-low carbon crystallizer covering slag for automobile sheet continuous casting, which comprises the following steps:
(1) raw materials and requirements: the casting powder is prepared by designing the following raw materials and other various raw materials, detecting the chemical components of the raw materials, and selecting the raw materials with the chemical components in percentage by weight meeting the following requirements:
wollastonite: SiO 22 52±3.5% CaO 44±3.5%
Fluorite: CaF2 ≥90% SiO2 ＜7.2% CaCO3＜4.5%
Cement clinker: SiO 22 19-24% CaO 62-66%
Calcined bauxite: al (Al)2O3≥80%
Industrial soda: na (Na)2CO3≥98%
Carbon black: the C solid is more than or equal to 97.5 percent
Glass powder: SiO 22 69±3% Al2O3＜5% Na2O≥9% ；
(2) Calculating the weight ratio of each raw material according to the condition of the chemical composition weight percentage of the crystallizer covering slag for the ultra-low carbon continuous casting;
(3) weighing corresponding raw materials according to the calculated weight, except carbonaceous materials, uniformly mixing the weighed raw materials, granulating, uniformly melting in an electric furnace at 1350-1450 ℃, keeping the temperature for 25min, and air-cooling after discharging to obtain a pre-melted material;
(4) crushing and grinding the pre-melted material, sieving the pre-melted material with a 200-mesh sieve, adding the prepared carbonaceous material, adding normal-temperature water which is about 1 time of the weight of the dry material and a binder which is 1-2 percent of the weight of the dry material into a ball mill, and finely grinding for 45 minutes to prepare slurry;
(5) and feeding the slurry into a spray particle drying tower for spray granulation and drying, wherein the water content of the finished product is not more than 0.5 percent, and the granularity is less than 2mm, and sealing and bagging the finished product for later use.
The ultra-low carbon crystallizer casting powder for continuous casting of the automobile plate is designed by adopting the technical scheme, is beneficial to coordinating the contradiction between melting point and lubrication after impurities are adsorbed in the ultra-low carbon continuous casting process of the automobile plate, effectively coordinates the lubricating of a casting blank by the casting powder in the continuous casting process of the ultra-low carbon plate blank of the automobile plate, reduces the depression and slag inclusion incidence on the surface of the casting blank while improving the lubrication of the casting blank, prevents the recarburization of molten steel or the casting blank caused by the casting powder, improves the surface and subcutaneous quality of the casting blank, is beneficial to the continuous casting and the continuous casting, and improves the production efficiency of continuous casting.
Detailed Description
The invention relates to an ultra-low carbon crystallizer covering slag for continuous casting of automobile sheets, which comprises the following chemical components in percentage by weight:
33%<CaO<41%，35.5%<SiO2<43.5%，1%<Al2O3<6.0%，0<MgO<4% , 0<Fe2O3<3%，3.5%<F-<9.5%，1.5%<R2O<7.5%，1.0%<C<3% and the balance impurities, wherein R2O is an alkali metal oxide.
The invention relates to an ultra-low carbon crystallizer casting powder for continuous casting of an automobile sheet, which comprises the following chemical components in percentage by weight:
CaO 37.24%, SiO239.54% of Al2O33.91% of MgO, 0.13% of Fe2O30.86% of F-6.49% of R24.46% of O, 1.21% of C and the balance of impurities.
The invention relates to an ultra-low carbon crystallizer casting powder for continuous casting of an automobile sheet, which comprises the following chemical components in percentage by weight:
CaO 37.31%, SiO239.19% of Al2O34.01%, MgO 0.14%, Fe2O31.04%, F-6.60% of R24.65% of O, 1.49% of C and the balance of impurities.
The invention relates to an ultra-low carbon crystallizer casting powder for continuous casting of automobile sheets, which comprises the following chemical components in percentage by weight:
CaO 37.65%, SiO239.48% of Al2O34.13% of MgO, 0.26% of Fe2O30.97% by weight, F-6.74% of R24.51% of O, 1.62% of C and the balance of impurities.
In the above examples, the basicity CaO/SiO2Should be 0.75 to 1.15, R2O is an alkali metal oxide, mainly Na2O, and also K with a trace amount of various materials2O。
The invention discloses a preparation method of ultra-low carbon crystallizer covering slag for automobile sheet continuous casting, which comprises the following steps:
1) raw materials and requirements: the casting powder is prepared by designing the following raw materials and other various raw materials, detecting the chemical components of the raw materials, and selecting the raw materials with the chemical components in percentage by weight meeting the following requirements:
wollastonite: SiO 22 52±3.5% CaO 44±3.5%
Fluorite: CaF2 ≥90% SiO2 ＜7.2% CaCO3＜4.5%
Cement clinker: SiO 22 19-24% CaO 62-66%
Calcined bauxite: al (Al)2O3≥80%
Industrial soda: na (Na)2CO3≥98%
Carbon black: the C solid is more than or equal to 97.5 percent
Glass powder: SiO 22 69±3% Al2O3＜5% Na2O≥9%
2) Calculating the weight ratio of each raw material according to the condition of the chemical composition weight percentage of the crystallizer covering slag for the ultra-low carbon continuous casting;
3) weighing corresponding raw materials (except carbonaceous materials) according to the calculated weight, uniformly mixing the weighed raw materials, granulating, uniformly melting in an electric furnace (keeping the temperature at 1350-1450 ℃ for about 25 min), discharging, and air cooling to obtain a pre-melted material;
4) crushing and grinding the pre-melted material, sieving the pre-melted material with a 200-mesh sieve, adding a pre-prepared carbon material, adding normal-temperature water which is about 1 time of the weight of the dry material and a binder which is 1-2% of the weight of the dry material into a ball mill, and finely grinding for 45 minutes to prepare slurry;
5) and (3) feeding the slurry into a spray particle drying tower for spray granulation and drying, wherein the water content of the finished product is required to be not more than 0.5%, and the granularity is less than 2mm, and sealing and bagging the finished product for later use.
In the above examples, the properties of 1300 ℃ viscosity, softening point, melting point and flow point for each mold flux are shown in Table 1.
In the above examples, the cross-section and typical composition of the mold flux for the cast steel type are shown in Table 2.
The above examples show that the crystallizer has good slagging in the casting process, the crystallizer has stable heat flow, abnormal conditions such as bonded bleed-out and the like do not occur, the casting blank has no abnormal conditions after surface inspection, the inclusions are obviously reduced after rolling (the inclusions are reduced from 3.5-4% to 0.95% at present), and the surface and subcutaneous quality of the casting blank is good.
Test data
The test summary of the ultra-low carbon crystallizer covering slag for continuous casting of automobile sheets and the preparation method thereof is as follows;
a product manufacturing section:
according to the original burning material test plan of the fifth Steel works Limited (MTP/ANSTTEEL 5LG 60-18-ygds), the steelmaking head office organizes a test on continuous casting IF steel covering slag (namely the covering slag, model HJ-IF) of Hengji metallurgy Limited in Xixia county in a 5# line continuous casting three-operation area, and the specific test result is as follows:
1. test site: a 5# line continuous casting three-operation area of a steel-making main plant;
2. and (3) test supplier: xixia county Hengji Material Ltd;
3. test time: 30 days in 2018, 10 months to 11 months and 6 days;
4. the variety and the number of the test: the mold flux is 2 tons in model HJ-IF;
5. the test method comprises the following steps:
5.1 when the test material reaches the steel-making factory, the steel-making factory checks the product package, the mark, the quality certificate, the granularity, the appearance quality and the like, and tests are carried out after the test material is qualified.
5.2 basic procedure of the test: last pot → last three pots → single flow flood → double flow flood.
5.3 in the test process, a main steelmaking factory and a responsible person of a test supplier send a specially assigned person to track, calibrate the consumption of the casting powder, the thickness of the liquid slag layer, the slag strips, the heat preservation, the spreading, the melting and other conditions, and calibrate the surface quality of the casting blank.
And 5.4, stopping the experiment when steel leakage, quality accidents and the like occur.
5.5 test data are as follows:
the test steel types are ABEFQD, ABJQD ABQW1B ABQQQ 1 ABRA11, GHLX11 and 230 x (1150-1550 mm) section, the average liquid slag layer is 10-16mm, the average slag consumption is 0.45-0.55 kg/ton steel, the pulling speed is 0.95-1.39m/min, the overall test effect is ideal, and the test steel types are specifically shown in tables 3 and 4:
TABLE 3 staging test conditions
TABLE 4 basic data of the tests
6. Testing results;
6.1 covering slag consumption: 0.45-0.55 kg/t;
6.2 thickness of liquid slag layer: 10-16 mm;
6.3 satisfying the pulling rate range: 0.95-1.39 m/min;
6.4 the surface quality of the continuous casting billet is normal and has no defect.
6.5 use state: the use process has no sintering, carbon loss and whitening phenomena, less slag strips, good heat preservation, spreadability and melting property.
According to the casting powder, the model HJ-IF, each technical index reaches the target required by a test plan from the test result and the field tracking condition, and the casting powder can be used on a casting machine of a 5# line continuous casting three-operation area in a steel-making main plant.
The invention relates to a review report of ultra-low carbon crystallizer casting powder for automobile plate continuous casting, which comprises the following steps: the original combustion material review report of the saddle steel company, Inc., No. MTE/ANSTELEL 5LG 60-18-ygds;
material name: 5-line IF steel continuous casting mold powder, namely the crystallizer mold powder for cold forging steel continuous casting;
and (3) test supplier: xixia county Hengji Material Ltd;
test time: 2018.10.30-2018.11.06;
the unit of use: 5# line of a steel-making main plant;
test number: 2 tons of the catalyst;
according to the equipment asset procurement center 'A-type asset test recommendation letter' and the relevant company approval (product manufacturing (2018) No. 31), the product manufacturing department organizes tests on the IF steel continuous casting mold flux provided by the test supplier. After the test is finished, the steel-making central plant submits a test summary to the product manufacture.
And (4) evaluating results:
1. test methods and procedures;
1.1 the test material firstly arrives at the 5# line continuous casting workshop of the steel-making central plant, and the steel-making central plant is responsible for checking the appearance quality of the package, the mark, the quality certificate and the test material and puts the test material into an industrial test after the test material is qualified.
1.2 test method, last pot → last three pots → single flow full pour → double flow full pour.
1.3, test tracking, wherein in the test process, a main steelmaking factory and a test supplier are responsible for dispatching a specially-assigned person for tracking and calibrating the conditions of spreading, melting, heat preservation, lubrication and the like of the protective slag;
1.4 test targets are 1) the consumption of the covering slag is 0.45kg/t-0.55kg/t, 2) the thickness of a liquid slag layer is 10mm-l6m, and 3) the satisfied pulling speed range is 0.9 m/min-1.3 m/min; 4) the surface quality of the continuous casting billet meets the saddle steel standard. 5) The using state is that the phenomena of sintering, decarburization and whitening are not generated in the using process, the slag strips are few, and the heat preservation property, the spreadability and the melting property are good.
2. Testing results;
the test steel grades are M3A22, M3A22 and the like.
The test material has qualified appearance quality and no impurities.
The use process has no sintering, decarburization and whitening phenomena, less slag strips, good heat preservation, spreadability, meltability and lubricity;
the thickness of a liquid slag layer is 10m-16m, the consumption of casting powder is 0.45kg/t-0.55kg/t, the pulling speed range is 0.95m/min-1.39m/min, the casting blank section is 230 mx (1150 m-1550 mm), the surface quality of the casting blank is normal, and no defect is generated.
And (5) the conclusion is that the appearance quality and the using effect of the test material meet the requirements of a test plan, and the success of the test is confirmed.
Claims (7)
1. The ultra-low carbon crystallizer covering slag for continuous casting of automobile plates is characterized by comprising the following chemical components in percentage by weight:
33%<CaO<41%，35.5%<SiO2<43.5%，1%<Al2O3<6.0%，0<MgO<4% , 0<Fe2O3<3%，3.5%<F-<9.5%，1.5%<R2O<7.5%，1.0%<C<3% and the balance impurities, wherein R2O is an alkali metal oxide.
2. The ultra-low carbon mold flux for continuous casting of automobile sheets as claimed in claim 1, wherein the mold flux comprises the following chemical components in percentage by weight:
CaO 37.24%, SiO239.54% of Al2O33.91% of MgO, 0.13% of Fe2O30.86% of F-6.49% of R24.46% of O, 1.21% of C and the balance of impurities.
3. The ultra-low carbon mold flux for continuous casting of automobile sheets as claimed in claim 1, wherein the mold flux comprises the following chemical components in percentage by weight:
CaO 37.31%, SiO239.19% of Al2O34.01%, MgO 0.14%, Fe2O31.04%, F-6.60% of R24.65% of O, 1.49% of C and the balance of impurities.
4. The ultra-low carbon mold flux for continuous casting of automobile sheets as claimed in claim 1, wherein the mold flux comprises the following chemical components in percentage by weight:
CaO 37.65%, SiO239.48% of Al2O34.13% of MgO, 0.26% of Fe2O30.97% by weight, F-6.74% of R24.51% of O, 1.62% of C and the balance of impurities.
5. The ultra-low carbon mold flux for continuous casting of automobile sheets according to any one of claims 1 to 4, wherein the basicity CaO/SiO is20.75 to 1.15.
6. The ultra-low carbon mold flux for continuous casting of automobile sheets according to any one of claims 1 to 4, wherein the alkali metal oxide R is2O is mainly Na2O, and also K with a trace amount of various materials2O。
7. A method for preparing the ultra-low carbon mold flux for continuous casting of automobile sheets according to any one of claims 1 to 4, comprising the steps of:
(1) raw materials and requirements: the casting powder is prepared by designing the following raw materials and other various raw materials, detecting the chemical components of the raw materials, and selecting the raw materials with the chemical components in percentage by weight meeting the following requirements:
wollastonite: SiO 22 52±3.5% CaO 44±3.5%
Fluorite: CaF2 ≥90% SiO2 ＜7.2% CaCO3＜4.5%
Cement clinker: SiO 22 19-24% CaO 62-66%
Calcined bauxite: al (Al)2O3≥80%
Industrial soda: na (Na)2CO3≥98%
Carbon black: the C solid is more than or equal to 97.5 percent
Glass powder: SiO 22 69±3% Al2O3＜5% Na2O≥9% ；
(2) Calculating the weight ratio of each raw material according to the condition of the chemical composition weight percentage of the crystallizer covering slag for the ultra-low carbon continuous casting;
(3) weighing corresponding raw materials according to the calculated weight, except carbonaceous materials, uniformly mixing the weighed raw materials, granulating, uniformly melting in an electric furnace at 1350-1450 ℃, keeping the temperature for 25min, and air-cooling after discharging to obtain a pre-melted material;
(4) crushing and grinding the pre-melted material, sieving the pre-melted material with a 200-mesh sieve, adding the prepared carbonaceous material, adding normal-temperature water which is about 1 time of the weight of the dry material and a binder which is 1-2 percent of the weight of the dry material into a ball mill, and finely grinding for 45 minutes to prepare slurry;
(5) and feeding the slurry into a spray particle drying tower for spray granulation and drying, wherein the water content of the finished product is not more than 0.5 percent, and the granularity is less than 2mm, and sealing and bagging the finished product for later use.
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| CN115945658A (en) * | 2022-12-30 | 2023-04-11 | 湖南华菱涟源钢铁有限公司 | Continuous casting mold slag for casting high-aluminum steel molten steel and its preparation method and application |
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