CN113798458A - Continuous casting crystallizer casting powder and preparation method and application thereof - Google Patents
Continuous casting crystallizer casting powder and preparation method and application thereof Download PDFInfo
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- CN113798458A CN113798458A CN202111145450.6A CN202111145450A CN113798458A CN 113798458 A CN113798458 A CN 113798458A CN 202111145450 A CN202111145450 A CN 202111145450A CN 113798458 A CN113798458 A CN 113798458A
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 72
- 238000005266 casting Methods 0.000 title claims abstract description 46
- 239000000843 powder Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000002893 slag Substances 0.000 claims abstract description 83
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 31
- 239000011651 chromium Substances 0.000 claims abstract description 25
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 19
- 238000002844 melting Methods 0.000 claims abstract description 19
- 230000008018 melting Effects 0.000 claims abstract description 19
- 239000010935 stainless steel Substances 0.000 claims abstract description 17
- 239000012535 impurity Substances 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 15
- 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 12
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 12
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 12
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims description 35
- 239000002994 raw material Substances 0.000 claims description 32
- 238000001035 drying Methods 0.000 claims description 27
- 230000004907 flux Effects 0.000 claims description 23
- 238000005469 granulation Methods 0.000 claims description 23
- 230000003179 granulation Effects 0.000 claims description 23
- 239000007921 spray Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000002002 slurry Substances 0.000 claims description 18
- 239000011230 binding agent Substances 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 229920002472 Starch Polymers 0.000 claims description 7
- 239000008107 starch Substances 0.000 claims description 7
- 235000019698 starch Nutrition 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- 239000004375 Dextrin Substances 0.000 claims description 3
- 229920001353 Dextrin Polymers 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 3
- 235000019425 dextrin Nutrition 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 21
- 238000005272 metallurgy Methods 0.000 abstract description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 52
- 238000007670 refining Methods 0.000 description 32
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 30
- 239000000395 magnesium oxide Substances 0.000 description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 20
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 17
- 239000010436 fluorite Substances 0.000 description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 15
- 235000019738 Limestone Nutrition 0.000 description 15
- 239000006004 Quartz sand Substances 0.000 description 15
- 229910001570 bauxite Inorganic materials 0.000 description 15
- 239000000378 calcium silicate Substances 0.000 description 15
- 229910052918 calcium silicate Inorganic materials 0.000 description 15
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 15
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 15
- 239000010439 graphite Substances 0.000 description 15
- 229910002804 graphite Inorganic materials 0.000 description 15
- 239000006028 limestone Substances 0.000 description 15
- 239000011775 sodium fluoride Substances 0.000 description 15
- 235000013024 sodium fluoride Nutrition 0.000 description 15
- 238000003756 stirring Methods 0.000 description 15
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 238000005507 spraying Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 238000012216 screening Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 229910052682 stishovite Inorganic materials 0.000 description 4
- 229910052905 tridymite Inorganic materials 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 229910002974 CaO–SiO2 Inorganic materials 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- XZWYZXLIPXDOLR-UHFFFAOYSA-N metformin Chemical compound CN(C)C(=N)NC(N)=N XZWYZXLIPXDOLR-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer 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
-
- 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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to the technical field of metallurgy, in particular to continuous casting crystallizer covering slag and a preparation method and application thereof. The invention provides a continuous casting crystallizer covering slag, which comprises the following chemical components in percentage by mass: SiO 22：35‑40％、CaO：35‑40％、MgO：1.5‑2.2％、Al2O3：4‑6％、Na2O: 5-8%, F: 5-8%, C: 3-5% and the balance of inevitable impurities; wherein the binary basicity CaO/SiO of the covering slag20.95-1.05, a melting point of 1120-2.5 pas. According to the casting powder for the continuous casting crystallizer, the casting powder with high alkalinity, high melting point and high viscosity is matched with the specific casting powder component, so that the phenomena that the surface of a casting blank is easy to dent and crack when a low-carbon high-chromium corrosion-resistant steel material is continuously cast can be effectively inhibited.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to continuous casting crystallizer covering slag and a preparation method and application thereof.
Background
The low-carbon high-chromium corrosion-resistant steel is a steel material designed and developed aiming at the marine environment, and can greatly prolong the service life of marine engineering buildings. The material adopts low-carbon high-chromium components (C is less than or equal to 0.015 wt.%, Cr is 10 wt.%), the thermal conductivity of the components is low, the linear expansion coefficient is large, the solidification shrinkage of a blank shell is large in the continuous casting process, and the defects such as pits and cracks are easy to occur.
The prior art discloses a continuous casting method of high-chromium steel, which comprises the following steps: 1) injecting the molten L80-3Cr high-chromium steel with the superheat degree of 15-30 ℃ into a crystallizer of a continuous casting machine with casting powder to be cooled to obtain a continuous casting billet, and performing water cooling and electromagnetic stirring in the cooling process; 2) and (3) pulling the continuous casting slab out of the crystallizer, cooling the continuous casting slab sequentially through a secondary cooling area and an air cooling area, wherein the pulling speed is 0.5-0.6m/min, and carrying out dynamic light pressure treatment on the continuous casting slab at the solidification tail end, wherein the total pressure reduction is controlled to be 6-10 mm. The casting powder disclosed by the method is low-alkalinity, low-viscosity and low-melting-point casting powder, a thick solid slag film and more crystal phases cannot be formed in the continuous casting process, the heat of molten steel in a crystallizer is quickly dissipated, cracks are easily formed on the surface of a blank, the casting powder is only suitable for the continuous casting production of high-chromium steel L80-3Cr with the Cr content of 2.8-3.2%, and the phenomena of depression and cracks on the surface of a casting blank easily occur in the continuous casting of low-carbon high-chromium corrosion-resistant steel materials cannot be effectively inhibited.
Disclosure of Invention
The invention aims to overcome the defect that the conventional continuous casting crystallizer covering slag cannot effectively inhibit the phenomena of depression and cracks on the surface of a casting blank when low-carbon high-chromium corrosion-resistant steel material is continuously cast, and further provides the continuous casting crystallizer covering slag and a preparation method and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the mold flux for the continuous casting crystallizer comprises the following chemical components in percentage by mass: SiO 22：35-40％、CaO：35-40％、MgO：1.5-2.2％、Al2O3：4-6％、Na2O: 5-8%, F: 5-8%, C: 3-5% and the balance of inevitable impurities;
wherein the binary basicity CaO/SiO of the covering slag20.95-1.05, a melting point of 1120-1160 ℃, and a viscosity of 1.5-2.5 Pa.s at 1300 ℃.
Wherein CaO and SiO2: with CaO-SiO2Taking binary system as basic slag system, taking alkalinity CaO/SiO into consideration2The covering slag of the invention contains F which is formed into crystal gun crystalline (3 CaO.2SiO) crystal2·CaF2) And one of the main components for reducing the viscosity of the slag, so that the basicity of the slag must not be too high, otherwise the viscosity will drop significantly, so that in the solution according to the invention the basicity CaO/SiO2The upper limit is controlled to be 1.05. But CaO/SiO2The lower alkalinity can cause the obvious reduction of the melting point of the slag, is not beneficial to increasing the thickness of a solid slag film and reducing heat radiation, and CaO/SiO2The lower limit is controlled at 0.95. CaO/SiO for basicity2Controlling the content of CaO to be within 0.95-1.05 and ensuring the proportion of main components of the casting powder, wherein the mass percentage of CaO is controlled to be 35-40 percent, and SiO is controlled to be2The mass percentage of the component (A) is controlled to be 35-40%.
Al2O3: for the continuous casting mold flux of the present invention, Al2O3The viscosity of the mold flux can be remarkably improved, and therefore, the component in the mold flux is controlled to a high level as much as possible, but the content of Al is high2O3Is not beneficial to the absorption of Al in molten steel by the covering slag2O3And (4) inclusion. Based on this, Al is controlled in the continuous casting mold flux of the present invention2O3The mass percentage of (A) is 4-6%.
MgO: for the continuous casting mold flux according to the present invention, MgO increases the melting point of the mold flux but decreases the viscosity of the mold flux. Therefore, the mass percent of MgO is controlled to be 1.2-2.2%.
Na2O: in the continuous casting mold flux of the present invention, Na is contained2O is in the mold fluxThe fluxing agent can effectively reduce the melting point and viscosity of the casting powder. In order to increase the thickness of the solid slag film in the crystallizer, improve the uniformity of the slag film and reduce the heat radiation, Na needs to be strictly controlled2O content, therefore, Na2The mass percentage of O is controlled between 5 percent and 8 percent.
F: in the continuous casting crystallizer covering slag, F can reduce the viscosity and the melting point of the covering slag, and the crystallization of the slag can be enhanced due to the over-high content of F, so that the due lubricating function of the slag is damaged, therefore, the content of F is controlled at a lower level, and the mass percent is controlled at 5-8%.
C: for the continuous casting crystallizer casting powder, a carbon material is necessary for controlling the stable melting of the casting powder on the surface of molten steel and keeping a certain powder layer thickness (which can play a role in heat insulation and heat preservation). The addition of C prevents the aggregation of small droplets of molten mold flux, and the low C content increases the thickness of the molten slag film and improves the lubricating effect, so the amount of C added is controlled to 3-5%.
Preferably, the casting powder is continuous casting crystallizer casting powder for low-carbon high-chromium corrosion-resistant steel;
further preferably, the low-carbon high-chromium corrosion-resistant steel comprises the following chemical components in percentage by mass: c: less than or equal to 0.015%, Si: 0.20-0.40%, Mn: 1.10-1.40%, P: less than or equal to 0.015%, S: less than or equal to 0.007 percent, Cr: 8.5-11.0%, Mo: 0.8-1.2%, V: 0.02-0.06%, and the balance of Fe and inevitable impurities.
The invention also provides a preparation method of the continuous casting crystallizer covering slag, which comprises the following steps:
s1: weighing raw materials of each component according to a formula ratio, mixing the raw materials to obtain a mixture, adding a binder into the mixture, and mixing to obtain a mixed raw material;
s2: mixing the mixed raw materials with water to obtain slurry;
s3: and carrying out spray granulation, drying and baking on the slurry to obtain the continuous casting crystallizer casting powder.
Preferably, the binder in step S1 is selected from one or more of starch, dextrin, and carboxymethyl cellulose; the addition amount of the binder is 2-3% of the mass of the mixture.
Preferably, the mass ratio of the mixed raw material to water in step S2 is 1: (2.5-3.0).
Preferably, the drying temperature is 10-40 ℃, the drying time is 5-20s, the baking temperature is 100-.
Preferably, in step S1, the mixing time is 10-15min, and the rotation speed is 25-40 r/min.
Preferably, the grain size of the continuous casting mold flux is not less than 100 mesh.
Optionally, the raw material of the covering slag is selected from calcium silicate refining slag, calcium aluminate refining slag, limestone, bauxite, sodium fluoride, magnesia, quartz sand, fluorite and graphite.
The invention also provides application of the continuous casting crystallizer covering slag or the covering slag prepared by the preparation method in continuous casting production of low-carbon high-chromium corrosion-resistant steel.
Preferably, the low-carbon high-chromium corrosion-resistant steel comprises the following chemical components in percentage by mass: c: less than or equal to 0.015%, Si: 0.20-0.40%, Mn: 1.10-1.40%, P: less than or equal to 0.015%, S: less than or equal to 0.007 percent, Cr: 8.5-11.0%, Mo: 0.8-1.2%, V: 0.02-0.06%, and the balance of Fe and inevitable impurities.
The invention has the beneficial effects that:
the invention provides a continuous casting crystallizer covering slag, which is designed aiming at a low-carbon high-chromium corrosion-resistant steel material, and is high in alkalinity, high in melting point and high in viscosity, and the high melting point is adopted, so that the thickness of a solid slag film is increased, and the heat radiation is reduced; the high alkalinity is beneficial to forming more crystal phases in the solid slag film, and further reduces the heat dissipation; the invention controls the solidification heat transfer rate of the molten steel in the crystallizer by the covering slag with high alkalinity, high melting point and high viscosity, avoids the concentrated shrinkage of a billet shell caused by too fast heat dissipation, reduces the thermal stress of a casting billet, can effectively inhibit the phenomena of depression and cracks on the surface of the casting billet during the continuous casting of the low-carbon high-chromium corrosion-resistant steel material by matching with specific covering slag components, ensures that the billet shell in the crystallizer grows uniformly and has good lubricating property, reduces the thermal stress of the casting billet, reduces the incidence rate of depression and cracks on the surface of the casting billet and improves the quality of the casting billet in the production process of the low-carbon high-chromium steel continuous casting.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
Example 1
The embodiment provides a continuous casting crystallizer casting powder, which comprises the following chemical components in percentage by mass: SiO 22：40％、CaO：38％、MgO：1.5％、Al2O3：6％、Na2O: 5%, F: 5%, C: 3 percent, and the balance of inevitable impurities;
wherein the binary basicity CaO/SiO of the covering slag20.95, a melting point of 1120 ℃ and a viscosity of 2.5 pas at 1300 ℃.
The preparation method of the covering slag comprises the following steps:
s1: weighing calcium silicate refining slag, calcium aluminate refining slag, limestone, bauxite, sodium fluoride, magnesia, quartz sand, fluorite and graphite according to the formula proportion, putting the calcium silicate refining slag, the calcium aluminate refining slag, the limestone, the bauxite, the sodium fluoride, the magnesia, the quartz sand, the fluorite and the graphite into a mixer for fully mixing for 10min at the rotating speed of 40r/min to obtain mixed dry materials, then adding a starch binder accounting for 2 percent of the mass of the mixed dry materials, and stirring and mixing to obtain mixed raw materials;
s2: adding water into the mixed raw materials, and mixing (the mass ratio of the mixed raw materials to the water is 1: 2.5) to obtain slurry;
s3: spraying the slurry by a high-pressure spray gun, carrying out spray granulation in a spray granulation tower, and drying, baking and screening after the granulation is finished to obtain the continuous casting crystallizer casting powder; the drying temperature is 10 ℃, the drying time is 20s, the baking temperature is 100 ℃, the baking time is 3h, and the granularity of the continuous casting crystallizer casting powder is 100 meshes.
Example 2
The embodiment provides a continuous casting crystallizer casting powder, which comprises the following chemical components in percentage by mass: SiO 22：35％、CaO：35％、MgO：2.2％、Al2O3：5％、Na2O: 8%, F: 8%, C: 5 percent, and the balance of inevitable impurities;
wherein the binary basicity CaO/SiO of the covering slag21.00, a melting point of 1140 ℃ and a viscosity of 2.0 pas at 1300 ℃.
The preparation method of the covering slag comprises the following steps:
s1: weighing calcium silicate refining slag, calcium aluminate refining slag, limestone, bauxite, sodium fluoride, magnesia, quartz sand, fluorite and graphite according to the formula proportion, then putting the calcium silicate refining slag, the calcium aluminate refining slag, the limestone, the bauxite, the sodium fluoride, the magnesia, the quartz sand, the fluorite and the graphite into a mixer for fully mixing for 12min, and stirring and mixing at the rotating speed of 32 r/min of the mixer to obtain a mixed dry material, then adding a dextrin adhesive accounting for 2.5 percent of the mass of the mixed dry material, and stirring and mixing to obtain a mixed raw material;
s2: adding water into the mixed raw materials, and mixing (the mass ratio of the mixed raw materials to the water is 1: 2.7) to obtain slurry;
s3: spraying the slurry by a high-pressure spray gun, carrying out spray granulation in a spray granulation tower, and drying, baking and screening after the granulation is finished to obtain the continuous casting crystallizer casting powder; the drying temperature is 25 ℃, the drying time is 15s, the baking temperature is 150 ℃, the baking time is 3.5h, and the granularity of the continuous casting crystallizer covering slag is 120 meshes.
Example 3
The embodiment provides a continuous casting crystallizer casting powder, which comprises the following chemical components in percentage by mass: SiO 22：38％、CaO：40％、MgO：1.8％、Al2O3：4％、Na2O：6％、F：6％、C：4％The balance of inevitable impurities;
wherein the binary basicity CaO/SiO of the covering slag21.05, a melting point of 1160 ℃ and a viscosity of 1.5 pas at 1300 ℃.
The preparation method of the covering slag comprises the following steps:
s1: weighing calcium silicate refining slag, calcium aluminate refining slag, limestone, bauxite, sodium fluoride, magnesia, quartz sand, fluorite and graphite according to the formula proportion, then putting the calcium silicate refining slag, the calcium aluminate refining slag, the limestone, the bauxite, the sodium fluoride, the magnesia, the quartz sand, the fluorite and the graphite into a mixer for fully mixing for 15min, and stirring and mixing at the rotating speed of 25 r/min of the mixer to obtain a mixed dry material, then adding a carboxymethyl cellulose binder accounting for 3.0 percent of the mass of the mixed dry material, and stirring and mixing to obtain a mixed raw material;
s2: adding water into the mixed raw materials, and mixing (the mass ratio of the mixed raw materials to the water is 1: 3) to obtain slurry;
s3: spraying the slurry by a high-pressure spray gun, carrying out spray granulation in a spray granulation tower, and drying, baking and screening after the granulation is finished to obtain the continuous casting crystallizer casting powder; the drying temperature is 40 ℃, the drying time is 5s, the baking temperature is 200 ℃, the baking time is 4h, and the granularity of the continuous casting crystallizer covering slag is 150 meshes.
Comparative example 1
The comparative example provides a continuous casting crystallizer covering slag which comprises the following chemical components in percentage by mass: SiO 22：27％、CaO：22％、MgO：2.8％、Al2O3：10％、Na2O: 12%, F: 10%, C: 15% of the total weight of the composition, and the balance of inevitable impurities;
wherein the binary basicity CaO/SiO of the covering slag20.81, a melting point of 1050 ℃ and a viscosity of 0.72 pas at 1300 ℃.
The preparation method of the covering slag comprises the following steps:
s1: weighing calcium silicate refining slag, calcium aluminate refining slag, limestone, bauxite, sodium fluoride, magnesia, quartz sand, fluorite and graphite according to the formula proportion, then putting the calcium silicate refining slag, the calcium aluminate refining slag, the limestone, the bauxite, the sodium fluoride, the magnesia, the quartz sand, the fluorite and the graphite into a mixer for fully mixing for 10min, and stirring and mixing at the rotating speed of 40r/min of the mixer to obtain a mixed dry material, then adding a starch binder accounting for 2.0 percent of the mass of the mixed dry material, and stirring and mixing to obtain a mixed raw material;
s2: adding water into the mixed raw materials, and mixing (the mass ratio of the mixed raw materials to the water is 1: 2.5) to obtain slurry;
s3: spraying the slurry by a high-pressure spray gun, carrying out spray granulation in a spray granulation tower, and drying, baking and screening after the granulation is finished to obtain the continuous casting crystallizer casting powder; the drying temperature is 10 ℃, the drying time is 20s, the baking temperature is 100 ℃, the baking time is 3h, and the granularity of the continuous casting crystallizer casting powder is 100 meshes.
Comparative example 2
The comparative example provides a continuous casting crystallizer covering slag which comprises the following chemical components in percentage by mass: SiO 22：27％、CaO：26％、MgO：2.8％、Al2O3：8％、Na2O: 10%, F: 10%, C: 15% of the total weight of the composition, and the balance of inevitable impurities;
wherein the binary basicity CaO/SiO of the covering slag20.96, a melting point of 1070 ℃ and a viscosity of 0.63 pas at 1300 ℃.
The preparation method of the covering slag comprises the following steps:
s1: weighing calcium silicate refining slag, calcium aluminate refining slag, limestone, bauxite, sodium fluoride, magnesia, quartz sand, fluorite and graphite according to the formula proportion, then putting the calcium silicate refining slag, the calcium aluminate refining slag, the limestone, the bauxite, the sodium fluoride, the magnesia, the quartz sand, the fluorite and the graphite into a mixer for fully mixing for 10min, and stirring and mixing at the rotating speed of 40r/min of the mixer to obtain a mixed dry material, then adding a starch binder accounting for 2.0 percent of the mass of the mixed dry material, and stirring and mixing to obtain a mixed raw material;
s2: adding water into the mixed raw materials, and mixing (the mass ratio of the mixed raw materials to the water is 1: 2.5) to obtain slurry;
s3: spraying the slurry by a high-pressure spray gun, carrying out spray granulation in a spray granulation tower, and drying, baking and screening after the granulation is finished to obtain the continuous casting crystallizer casting powder; the drying temperature is 10 ℃, the drying time is 20s, the baking temperature is 100 ℃, the baking time is 3h, and the granularity of the continuous casting crystallizer casting powder is 100 meshes.
Comparative example 3
The comparative example provides a continuous casting crystallizer covering slag which comprises the following chemical components in percentage by mass: SiO 22：35％、CaO：33％、MgO：2.8％、Al2O3：10％、Na2O: 7%, F: 7%, C: 4 percent, and the balance of inevitable impurities;
wherein the binary basicity CaO/SiO of the covering slag20.94, a melting point of 1090 ℃ and a viscosity of 2.5 pas at 1300 ℃.
The preparation method of the covering slag comprises the following steps:
s1: weighing calcium silicate refining slag, calcium aluminate refining slag, limestone, bauxite, sodium fluoride, magnesia, quartz sand, fluorite and graphite according to the formula proportion, then putting the calcium silicate refining slag, the calcium aluminate refining slag, the limestone, the bauxite, the sodium fluoride, the magnesia, the quartz sand, the fluorite and the graphite into a mixer for fully mixing for 10min, and stirring and mixing at the rotating speed of 40r/min of the mixer to obtain a mixed dry material, then adding a starch binder accounting for 2.0 percent of the mass of the mixed dry material, and stirring and mixing to obtain a mixed raw material;
s2: adding water into the mixed raw materials, and mixing (the mass ratio of the mixed raw materials to the water is 1: 2.5) to obtain slurry;
s3: spraying the slurry by a high-pressure spray gun, carrying out spray granulation in a spray granulation tower, and drying, baking and screening after the granulation is finished to obtain the continuous casting crystallizer casting powder; the drying temperature is 10 ℃, the drying time is 20s, the baking temperature is 100 ℃, the baking time is 3h, and the granularity of the continuous casting crystallizer casting powder is 100 meshes.
Comparative example 4
The comparative example provides a continuous casting crystallizer covering slag which comprises the following chemical components in percentage by mass: SiO 22：37％、CaO：32％、MgO：6.8％、Al2O3：12％、Na2O: 3%, F: 3%, C: 5 percent, and the balance of inevitable impurities;
wherein the binary basicity CaO/SiO of the covering slag20.86, a melting point of 1120 ℃ and a viscosity of 2.5 pas at 1300 ℃.
The preparation method of the covering slag comprises the following steps:
s1: weighing calcium silicate refining slag, calcium aluminate refining slag, limestone, bauxite, sodium fluoride, magnesia, quartz sand, fluorite and graphite according to the formula proportion, then putting the calcium silicate refining slag, the calcium aluminate refining slag, the limestone, the bauxite, the sodium fluoride, the magnesia, the quartz sand, the fluorite and the graphite into a mixer for fully mixing for 10min, and stirring and mixing at the rotating speed of 40r/min of the mixer to obtain a mixed dry material, then adding a starch binder accounting for 2.0 percent of the mass of the mixed dry material, and stirring and mixing to obtain a mixed raw material;
s2: adding water into the mixed raw materials, and mixing (the mass ratio of the mixed raw materials to the water is 1: 2.5) to obtain slurry;
s3: spraying the slurry by a high-pressure spray gun, carrying out spray granulation in a spray granulation tower, and drying, baking and screening after the granulation is finished to obtain the continuous casting crystallizer casting powder; the drying temperature is 10 ℃, the drying time is 20s, the baking temperature is 100 ℃, the baking time is 3h, and the granularity of the continuous casting crystallizer casting powder is 100 meshes.
Test example 1
The low-carbon high-chromium corrosion-resistant steel is produced by adopting the following production process KR → BOF → LF → RH → CC, and specifically comprises the following steps:
KR step (B): mechanically stirring the molten iron, and spraying lime powder and fluorite for desulfurization;
BOF procedure: pouring molten iron obtained by KR desulfurization into a converter, and carrying out oxygen blowing, temperature rising, decarburization and dephosphorization on the molten iron to obtain low-carbon molten steel;
an LF procedure: conveying the low-carbon molten steel to a refining process, and carrying out deoxidation, desulfurization, alloying and heating to obtain molten steel with components close to target components;
RH process: further, hoisting the molten steel to a vacuum refining process, degassing, alloying and controlling the temperature to obtain the molten steel with the temperature and the components meeting the requirements;
and (C) a step: and hoisting the molten steel with the temperature and the components meeting the requirements to a continuous casting platform, and carrying out protective casting to obtain the continuous casting billet.
The low-carbon high-chromium corrosion-resistant steel prepared by the method comprises the following chemical components in percentage by mass: 0.008% of C, 0.30% of Si, 1.25% of Mn, 0.010% of P, 0.005% of S, 9.7% of Cr, 1.05% of Mo, 0.04% of V, and the balance of Fe and inevitable residual impurities.
Wherein the casting powder of the examples 1 to 3 and the comparative examples 1 to 4 are respectively adopted to carry out protective casting on the continuous casting billet in the process of producing the low-carbon high-chromium corrosion-resistant steel.
The surface depression incidence and crack incidence of the prepared casting blanks are counted, the counting method is to count the number of depressions and cracks on the surfaces of 100 continuous casting blanks correspondingly produced by each type of covering slag, and the result is shown in table 1.
TABLE 1 occurrence of dishing and crack in casting slab
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The continuous casting crystallizer casting powder is characterized by comprising the following chemical components in percentage by mass: SiO 22：35-40％、CaO：35-40％、MgO：1.5-2.2％、Al2O3：4-6％、Na2O: 5-8%, F: 5-8%, C: 3-5% and the balance of inevitable impurities;
wherein the binary basicity CaO/SiO of the covering slag20.95-1.05, a melting point of 1120-1160 ℃, and a viscosity of 1.5-2.5 Pa.s at 1300 ℃.
2. The continuous-casting mold flux according to claim 1, wherein the mold flux is a continuous-casting mold flux for low-carbon high-chromium corrosion-resistant steel;
the low-carbon high-chromium corrosion-resistant steel comprises the following chemical components in percentage by mass: c: less than or equal to 0.015%, Si: 0.20-0.40%, Mn: 1.10-1.40%, P: less than or equal to 0.015%, S: less than or equal to 0.007 percent, Cr: 8.5-11.0%, Mo: 0.8-1.2%, V: 0.02-0.06%, and the balance of Fe and inevitable impurities.
3. A method for preparing the mold flux for a continuous casting mold according to claim 1 or 2, comprising the steps of:
s1: weighing raw materials of each component according to a formula ratio, mixing the raw materials to obtain a mixture, adding a binder into the mixture, and mixing to obtain a mixed raw material;
s2: mixing the mixed raw materials with water to obtain slurry;
s3: and carrying out spray granulation, drying and baking on the slurry to obtain the continuous casting crystallizer casting powder.
4. The method for preparing the continuous casting mold flux according to claim 3, wherein the binder in the step S1 is one or more selected from the group consisting of starch, dextrin, carboxymethyl cellulose; the addition amount of the binder is 2-3% of the mass of the mixture.
5. The method for preparing the mold flux of the continuous casting crystallizer of claim 3 or 4, wherein the mass ratio of the mixed raw material to water in step S2 is 1: (2.5-3.0).
6. The method for preparing the mold flux of the continuous casting crystallizer as defined in claim 3 to 5, wherein the drying temperature is 10 to 40 ℃, the drying time is 5 to 20s, the baking temperature is 100-.
7. The method for preparing mold flux of a continuous casting mold according to any one of claims 3 to 6, wherein the mixing time is 10 to 15min and the rotation speed is 25 to 40r/min in step S1.
8. The method of producing a continuous casting mold flux according to any one of claims 3 to 7, wherein the continuous casting mold flux has a particle size of not less than 100 mesh.
9. Use of the mold flux of the continuous casting crystallizer defined in claim 1 or 2 or the mold flux prepared by the preparation method defined in any one of claims 3 to 8 in the continuous casting production of low-carbon high-chromium corrosion-resistant steel.
10. The use according to claim 9, wherein the low-carbon high-chromium corrosion resistant steel comprises the following chemical components in percentage by mass: c: less than or equal to 0.015%, Si: 0.20-0.40%, Mn: 1.10-1.40%, P: less than or equal to 0.015%, S: less than or equal to 0.007 percent, Cr: 8.5-11.0%, Mo: 0.8-1.2%, V: 0.02-0.06%, and the balance of Fe and inevitable impurities.
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