CN113894272A - Corrosion-resistant alloy die casting protective slag - Google Patents
Corrosion-resistant alloy die casting protective slag Download PDFInfo
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- CN113894272A CN113894272A CN202111170918.7A CN202111170918A CN113894272A CN 113894272 A CN113894272 A CN 113894272A CN 202111170918 A CN202111170918 A CN 202111170918A CN 113894272 A CN113894272 A CN 113894272A
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- 239000002893 slag Substances 0.000 title claims abstract description 96
- 239000000956 alloy Substances 0.000 title claims abstract description 73
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 72
- 230000007797 corrosion Effects 0.000 title claims abstract description 56
- 238000005260 corrosion Methods 0.000 title claims abstract description 56
- 238000004512 die casting Methods 0.000 title claims abstract description 56
- 230000001681 protective effect Effects 0.000 title claims abstract description 28
- 229910001610 cryolite Inorganic materials 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
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 16
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 16
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 16
- 229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 15
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 42
- 239000000395 magnesium oxide Substances 0.000 claims description 21
- 230000004907 flux Effects 0.000 claims description 16
- 238000002844 melting Methods 0.000 claims description 16
- 230000008018 melting Effects 0.000 claims description 16
- 238000000227 grinding Methods 0.000 claims description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 6
- 239000010436 fluorite Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 235000017550 sodium carbonate Nutrition 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 235000019738 Limestone Nutrition 0.000 claims description 3
- 229910001570 bauxite Inorganic materials 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 239000006028 limestone Substances 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 2
- 238000005530 etching Methods 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 24
- 239000010959 steel Substances 0.000 abstract description 24
- 238000000034 method Methods 0.000 abstract description 11
- 206010039509 Scab Diseases 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 9
- 238000005266 casting Methods 0.000 description 50
- 239000000843 powder Substances 0.000 description 32
- 238000004519 manufacturing process Methods 0.000 description 15
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 239000010451 perlite Substances 0.000 description 3
- 235000019362 perlite Nutrition 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 229910002974 CaO–SiO2 Inorganic materials 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 229910018054 Ni-Cu Inorganic materials 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 229910018481 Ni—Cu Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- -1 magnesium aluminate Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation 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
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/18—Measures for using chemical processes for influencing the surface composition of castings, e.g. for increasing resistance to acid attack
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
Abstract
The invention belongs to the field of steel, and particularly relates to corrosion-resistant alloy die casting protective slag. Aiming at solving the problems of cold shut, scab, carburetion and the like on the surface of the corrosion resistant alloy cast ingot in the prior art. The invention provides corrosion-resistant alloy die casting protective slag which comprises the following chemical components in percentage by weight: CaO: 33 to 39% of Al2O3：33～39％，MgO：5～11％，Na2O：3～7％，CaF2：3～7％，Na3AlF6: 10-15%, and the balance of inevitable impurities. The covering slag is applied to die casting of Ni-based high-temperature corrosion-resistant alloy electrode ingots, the structure of slag is stable in the pouring process, the capability of adsorbing and mixing is strong, the steel slag interface is easy to separate, slag is not easy to curl, and the surface recarburization condition of the alloy electrode ingots is not found.
Description
Technical Field
The invention belongs to the field of steel, and particularly relates to corrosion-resistant alloy die casting protective slag.
Background
The corrosion-resistant alloy is a super alloy which can resist special medium corrosion, and mainly comprises an iron-based alloy, a nickel-based alloy, an active metal and the like. The nickel-based corrosion-resistant alloy, particularly the Ni-Cr alloy, the Ni-Cr-Mo alloy, the Ni-Cu alloy and the like, is widely used for manufacturing parts for various corrosion-resistant environments such as petroleum, chemical engineering, electric power and the like due to the high strength, high-temperature oxidation resistance, high-hydroxide resistance and high acid corrosion resistance, and particularly excellent service performance in high-temperature environments. With the development of industrial technology, the complexity of environmental media and the aggravation of international competition, the requirements of various industries on the comprehensive properties of corrosion-resistant alloy materials are higher and higher. The smelting of the corrosion resistant alloy adopts the processes of EBT → LF → VOD → die casting electrode ingot → electroslag remelting → electroslag ingot production. The working procedure of die casting the electrode ingot plays a decisive role in the quality of the final product, the working procedure has strong dependence on the casting powder, and the surface of the currently cast electrode ingot can generate defects of cracks, sticking slag, cold shut, scabs, pits and the like in different degrees due to the inherent characteristics of the casting powder. In order to reduce the influence of the surface defects of the electrode ingot on electroslag remelting, a factory carries out tumbling and point grinding treatment in different degrees according to the depth condition of the surface defects before electroslag remelting, the production efficiency is extremely low, and the production cost is extremely high. Therefore, the development of the casting powder suitable for the die casting of the corrosion-resistant alloy is urgently needed.
At present, the invention patents or literature documents about the die casting mold powder are more, for example, CN102764879A discloses a die casting mold powder for high aluminum steel, which comprises the following chemical components by weight percentage: SiO 22：22～28％，Al2O3：2～7％，CaO：16～22％，Fe2O3：2～5％，MgO：2～5％，MnO：2～6％，BaO：5～10％，B2O3：4～6％，R2O: 5-10%, F: 7-12%, C: 2-4%, the sum of the weight percentages of the components is 100%, and R2O is represented by Na2O and Li2And (C) O. The technical scheme adopted by the patent is that the casting powder with characteristics of a certain melting point, a melting speed, viscosity, alkalinity and the like is obtained by adjusting the components of the casting powder, so that the casting powder is suitable for casting high-aluminum steel and water-cooled molds, and the effects of improving the surface quality of steel ingots and ensuring the performance stability of the casting powder are achieved. However, the patent can not solve the problems that when the content of alloy elements such as Ni, Cr, Mo and the like in the alloy is increased, oxidation, surface slag inclusion and cracking are easy to occur in the casting processAnd the like.
For another example, patent CN106111952A discloses a mold powder for die casting of tool and die steel, which comprises the following chemical components by mass percent: 1.8-2.2% of soda ash, 1.7-2.3% of fluorite, 10.5-17.5% of perlite, 8.3-12.7% of diatomite, 18.5-21.5% of power plant ash, 28.0-32.5% of clinker, 4.5-5.5% of high-alumina powder, 13.5-16.5% of feldspar powder and 1.8-2.2% of expanded graphite, wherein the sum of all the components is 100%. The patent describes die casting protective slag for tools and dies, and the technical problem to be solved is to provide die casting protective slag which is special for tools and dies and has strong capability of absorbing impurities, can prevent impurities formed by oxidation from gathering on the surface of a casting blank, avoids the problems of longitudinal cracks and pits on the surface of the tools and dies, and can prevent secondary oxidation of molten steel. The technical scheme adopted by the patent is characterized in that the traditional protective slag system taking perlite as a main body is replaced by compounding diatomite and perlite. The mold flux disclosed by the patent cannot meet the requirement that the carbon content of the mold flux in the alloy with ultralow carbon content is as low as possible or no carbon is contained, so that the difficulty in blending the components of the mold flux is indirectly increased.
Although there are many patents and documents on the die casting mold flux, there are few reports on the prior art regarding the corrosion resistant alloy die casting mold flux. Therefore, in order to improve the quality of the corrosion resistant alloy die casting ingot, especially the surface quality of the die casting ingot, reduce grinding processing and metal grinding loss, improve yield and reduce production cost, the development of the corrosion resistant alloy die casting protective slag is urgently needed to solve the problems in the prior art.
Disclosure of Invention
The invention aims to provide corrosion-resistant alloy die casting protective slag, which solves the problems of cold shut, scab, longitudinal crack, slag channel, slag pit, recarburization and the like on the surface of a corrosion-resistant alloy die cast ingot in the prior art, reduces grinding processing of an electrode ingot and grinding loss of metal, improves production efficiency and product yield, and reduces production cost.
The invention aims to solve the technical problem of providing corrosion-resistant alloy die casting protective slag, which comprises the following chemical components in percentage by weight: CaO: 33 to 39% of Al2O3：33～39％，MgO：5～11％，Na2O：3～7％，CaF2：3～7％，Na3AlF6: 10-15%, and the balance of inevitable impurities.
Preferably, the corrosion-resistant alloy die casting mold flux comprises the following chemical components in percentage by weight: CaO: 35 to 38% of Al2O3：34～38％，MgO：6～10％，Na2O：4～6％，CaF2：4～6％，Na3AlF6: 11-15%, and the balance of inevitable impurities.
In the corrosion-resistant alloy die casting protective slag, the alkalinity comprises the following components in percentage by weight: [ (CaO + MgO)/(Al)2O3)]＝1.05～1.25。
In the corrosion-resistant alloy die casting covering slag, the particle size distribution of the covering slag is 100-300 meshes, wherein the covering slag with the particle size larger than 200 meshes accounts for more than 70% of the total weight.
In the corrosion-resistant alloy die casting covering slag, the melting point of the covering slag is 1250-1300 ℃, and the viscosity is less than 0.18Pa.s at 1350 ℃.
The preparation method of the corrosion-resistant alloy die casting protective slag comprises the steps of uniformly mixing and melting slagging raw materials, quenching with water, cooling, drying and grinding.
Wherein, the slagging raw material comprises: limestone, soda ash, fluorite, cryolite, bauxite and magnesia.
The corrosion-resistant alloy die casting protective slag is used for die casting of Ni-based high-temperature corrosion-resistant alloy electrode ingots.
Has the advantages that: (1) compared with the prior corrosion-resistant alloy die casting protective slag, the protective slag of the invention is CaO-Al2O3Is protective slag and does not contain SiO2The components can greatly weaken the oxidability of the slag and avoid the oxidation of the slag and the [ Ti ] in molten steel]And [ Al]After the casting powder is used, the components and the performance of the casting powder are changed slightly, and the problems of the deterioration of the casting powder performance and the defects of casting blanks caused by the traditional casting powder steel slag reaction can be effectively inhibited.
(2) The covering slag contains 10-15% of Na3AlF6Component, which is intended primarily to act as a fluxing agentMixing Al2O3The melting point of the aluminum alloy is reduced from 2054 ℃ to about 900 ℃, so that the melting point of the casting powder can be greatly reduced, and Al in the casting powder2O3Can be fully mixed with Na3AlF6、CaF2The components have synergistic effect, so that the lubrication and heat transfer of the casting blank are controlled, the smooth running of the casting process is ensured, and the surface quality of the casting blank is improved.
(3) The casting powder is applied to die casting of Ni-based high-temperature corrosion-resistant alloy electrode ingots, the structure of slag is stable in the casting process, the adsorption and inclusion capacity is strong, the steel slag interface is easy to separate and difficult to curl up slag, the quality problems of cold shut, scab, longitudinal crack, pits, slag adhesion and the like on the surface of the Ni-based corrosion-resistant alloy electrode ingot are thoroughly eliminated, and the surface recarburization condition of the alloy electrode ingot is not found.
Detailed Description
The invention aims to provide corrosion-resistant alloy die casting protective slag and a preparation method thereof, which are used for solving the problems of cold shut, scab, longitudinal crack, slag channel, slag pit, carburetion and the like on the surface of a corrosion-resistant alloy die cast ingot in the prior art, lightening the grinding process of an electrode ingot, improving the production efficiency and reducing the production cost.
The invention aims to solve the technical problem of providing corrosion-resistant alloy die casting protective slag, which comprises the following chemical components in percentage by weight: CaO: 33 to 39% of Al2O3：33～39％，MgO：5～11％，Na2O：3～7％，CaF2：3～7％，Na3AlF6: 10-15%, and the balance of inevitable impurities.
Preferably, the corrosion-resistant alloy die casting mold flux comprises the following chemical components in percentage by weight: CaO: 35 to 38% of Al2O3：34～38％，MgO：6～10％，Na2O：4～6％，CaF2：4～6％，Na3AlF6: 11-15%, and the balance of inevitable impurities.
In the corrosion-resistant alloy die casting protective slag, the alkalinity comprises the following components in percentage by weight: [ (CaO + MgO)/(Al)2O3)]＝1.05～1.25。
In the corrosion-resistant alloy die casting covering slag, the particle size distribution of the covering slag is 100-300 meshes, wherein the covering slag with the particle size larger than 200 meshes accounts for more than 70% of the total weight.
In the corrosion-resistant alloy die casting covering slag, the melting point of the covering slag is 1250-1300 ℃, and the viscosity is less than 0.18Pa.s at 1350 ℃.
The covering slag is CaO-Al2O3Protecting slag, compared with the traditional CaO-SiO2Is protective slag and does not contain SiO2The components can greatly weaken the oxidability of the slag and avoid the oxidation of the slag and the [ Ti ] in molten steel]And [ Al]And the components and the performance of the casting powder are changed slightly after reaction, so that the problems of the deterioration of the casting powder performance and the defects of casting blanks caused by the conventional casting powder steel slag reaction can be effectively inhibited.
Al in the protective slag of the invention2O333-39%, preferably 34-38%, is a main network structure forming body in the slag and Na3AlF6、CaF2The components have synergistic effect, so that the lubrication and heat transfer of the casting blank are controlled, the smooth pouring process is ensured, and the quality of the casting blank is improved.
The covering slag contains 10-15% of Na3AlF6The component preferably accounts for 11-15%, and is mainly used for acting as a fluxing agent and adding Al2O3The melting point of the aluminum alloy is reduced from 2054 ℃ to about 900 ℃, so that the melting point of the casting powder can be greatly reduced, and Al in the casting powder2O3Can be fully mixed with Na3AlF6、CaF2The components have synergistic effect, so that the lubrication and heat transfer of the casting blank are controlled, the smooth running of the casting process is ensured, and the surface quality of the casting blank is improved.
In order to maintain the alkalinity of the slag, the CaO in the casting powder is also high, and is 33-39%, preferably 35-38%.
Adding 5-11% of MgO into the covering slag to make the covering slag play a role of a network destroying body in the structure, and simultaneously controlling the adding amount within 11% to avoid the covering slag and Al2O3The interaction causes magnesium aluminate spinel to be separated out, changes the stable structure state of slag and causes the performance deterioration condition.
The invention adds the covering slagNa2O：3～7％，CaF2: 3-7%, and the preferable content is Na2O：4～6％，CaF2: 4-6%, which can keep the melting temperature and viscosity of the slag low and is beneficial to absorbing the impurities.
In the mold flux of the invention, the alkalinity is calculated by weight percent: [ (CaO + MgO)/(Al)2O3)]And (4) ensuring the viscosity and the melting temperature of the casting powder, wherein the viscosity is 1.05-1.25.
The casting powder is applied to die casting of Ni-based high-temperature corrosion-resistant alloy electrode ingots, the structure of slag is stable in the casting process, the adsorption and inclusion capacity is strong, the steel slag interface is easy to separate, slag is not rolled, the quality problems of cold shut, scab, longitudinal crack, pits, slag adhesion and the like on the surface of the Ni-based corrosion-resistant alloy electrode ingot are thoroughly eliminated, and the surface recarburization phenomenon of the alloy electrode ingot is not found.
The specific preparation method of the covering slag comprises the following steps of: limestone, soda ash, fluorite, cryolite, bauxite, magnesia and the like are mixed uniformly and then put into a premelting furnace to be melted into a whole, and the whole is cooled by water quenching and then dried and milled to obtain the powdery covering slag with the chemical composition.
EXAMPLE 1 casting of mold flux for Corrosion resistant alloy of the present invention
The chemical components of the corrosion resistant alloy die casting protective slag in the embodiment 1 comprise, by weight: CaO: 34% of Al2O3：35％，MgO：8％，Na2O：6％，CaF2：6％，Na3AlF6: 11 percent. Alkalinity: [ (CaO + MgO)/(Al)2O3)]1.20. Melting point: the viscosity at 1280 ℃ and 1350 ℃ is 0.16Pa.s, the granularity is distributed between 100 meshes and 300 meshes, wherein the granularity larger than 200 meshes accounts for more than 70 percent of the total weight, so that slag coatings can be formed quickly, the wall of a steel ingot mold can be lubricated, and the surface of the steel ingot is smooth.
The casting powder is applied to cast 7.85t UNS N08825 alloy die casting electrode ingots on site, and the UNS N08825 alloy comprises the following chemical components: c: less than or equal to 0.05 percent, Si: less than or equal to 0.5 percent, Mn: less than or equal to 1.0 percent, Ni: 38.0-46.0%, Cr: 19.5-23.5%, Fe: not less than 22%, Cu: 1.5% -3.0%, S: less than or equal to 0.03%, Al: less than or equal to 0.2 percent, Ti: 0.6% -1.2%, Mo: 2.5 to 3.5 percent. In the molten steel die casting stage, a lower pouring mode is adopted, the casting powder is placed at the position, close to the bottom of an ingot casting die, of about 500mm, the alloy liquid level rises stably in the pouring process, the slag hole phenomenon does not occur, and the electrode ingot is observed to have smooth surface after being demoulded, and the quality problems of cold shut, scab, longitudinal crack, slag runner, slag pit and the like do not occur. And no carburization phenomenon on the surface of the electrode ingot is found in the detection of a spectrum (an American thermoelectric ARL4460 type spark direct-reading spectrometer). The grinding process of the electrode ingot is reduced, the production efficiency is improved, and the production cost is reduced.
Example 2 casting of mold powder for casting of corrosion resistant alloy according to the invention
The chemical components of the corrosion resistant alloy die casting protective slag in the embodiment 2 comprise, by weight: CaO: 35% of Al2O3：36％，MgO：6％，Na2O：6％，CaF2：5％，Na3AlF6: 12 percent. Alkalinity: [ (CaO + MgO)/(Al)2O3)]1.14, melting point: the viscosity at 1270 ℃ and 1350 ℃ is 0.15Pa.s, the granularity is distributed between 100 meshes and 300 meshes, wherein the granularity larger than 200 meshes accounts for more than 70 percent of the total weight, so that slag coatings can be formed quickly, the wall of a steel ingot mold can be lubricated, and the surface of the steel ingot is smooth.
The covering slag is applied to cast 7.85t UNS N08821 alloy die casting electrode ingots on site, and the UNS N08821 alloy comprises the following chemical components: c: less than or equal to 0.025%, Si: less than or equal to 0.5 percent, Mn: less than or equal to 1.5 percent, Ni: 39.0% -46.0%, Cr: 20.0% -22.0%, Cu: 1.5% -3.0%, S: less than or equal to 0.03%, Al: less than or equal to 0.2 percent, Ti: 0.6% -1.0%, Mo: 5.0 to 6.5 percent, and the balance of Fe. In the molten steel die casting stage, a lower pouring mode is adopted, the casting powder is placed at the position, close to the bottom of an ingot casting die, of about 500mm, the alloy liquid level rises stably in the pouring process, the slag hole phenomenon does not occur, and the electrode ingot is observed to have smooth surface after being demoulded, and the quality problems of cold shut, scab, longitudinal crack, slag runner, slag pit and the like do not occur. And no carburization phenomenon on the surface of the electrode ingot is found in the detection of a spectrum (an American thermoelectric ARL4460 type spark direct-reading spectrometer). The grinding process of the electrode ingot is reduced, the production efficiency is improved, and the production cost is reduced.
EXAMPLE 3 casting of mold flux for Corrosion resistant alloy of the present invention
The chemical components of the corrosion resistant alloy die casting protective slag in the embodiment 3 comprise, by weight: CaO: 35% of Al2O3：37％，MgO：7％，Na2O：4％，CaF2：5％，Na3AlF6: 12 percent. Alkalinity: [ (CaO + MgO)/(Al)2O3)]1.13, melting point: the viscosity at 1290 ℃ and 1350 ℃ is 0.17Pa.s, the granularity is distributed between 100 meshes and 300 meshes, wherein the granularity larger than 200 meshes accounts for more than 70 percent of the total weight, so that slag coatings can be formed quickly, the wall of a steel ingot mold can be lubricated, and the surface of the steel ingot is smooth.
The covering slag is applied to cast 3.22t UNS N08821 alloy die casting electrode ingots on site, and the UNS N08821 alloy comprises the following chemical components: c: less than or equal to 0.025%, Si: less than or equal to 0.5 percent, Mn: less than or equal to 1.5 percent, Ni: 39.0% -46.0%, Cr: 20.0% -22.0%, Cu: 1.5% -3.0%, S: less than or equal to 0.03%, Al: less than or equal to 0.2 percent, Ti: 0.6% -1.0%, Mo: 5.0 to 6.5 percent, and the balance of Fe. In the molten steel die casting stage, a lower casting injection mode is adopted, the casting powder is placed at the position, close to the bottom of an ingot casting mold, of about 500mm, the alloy liquid level rises stably in the casting process, the slag hole phenomenon does not occur, and the electrode ingot is observed to have smooth surface after being demoulded, and the quality problems of cold shut, scab, longitudinal crack, slag channel, slag pit and the like do not occur. And no carburization phenomenon on the surface of the electrode ingot is found in the detection of a spectrum (an American thermoelectric ARL4460 type spark direct-reading spectrometer). The grinding process of the electrode ingot is reduced, the production efficiency is improved, and the production cost is reduced.
The covering slag in the embodiment has stable structure of slag after being used, strong adsorption and inclusion capacity, easy separation of a steel slag interface and no slag rolling, thoroughly eliminates the quality problems of cold shut, scab, longitudinal crack, pit, slag adhesion and the like on the surface of the Ni-based corrosion-resistant alloy electrode ingot, and does not find the surface recarburization condition of the alloy electrode ingot.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (8)
1. DurableThe alloy-etching die casting protective slag is characterized in that: the chemical components of the material by weight percentage are as follows: CaO: 33 to 39% of Al2O3：33～39％，MgO：5～11％，Na2O：3～7％，CaF2：3～7％，Na3AlF6: 10-15%, and the balance of inevitable impurities.
2. A corrosion-resistant alloy die casting mold flux according to claim 1, wherein: the chemical components of the material by weight percentage are as follows: CaO: 35 to 38% of Al2O3：34～38％，MgO：6～10％，Na2O：4～6％，CaF2：4～6％，Na3AlF6: 11-15%, and the balance of inevitable impurities.
3. A corrosion-resistant alloy die-casting mold flux according to claim 1 or 2, wherein: the alkalinity is as follows by weight percent: [ (CaO + MgO)/(Al)2O3)]＝1.05～1.25。
4. The corrosion-resistant alloy die casting mold flux according to any one of claims 1 to 3, wherein: the particle size distribution of the covering slag is 100-300 meshes, wherein the particle size larger than 200 meshes accounts for more than 70% of the total weight.
5. The corrosion-resistant alloy die casting mold flux according to any one of claims 1 to 4, wherein: the melting point of the covering slag is 1250-1300 ℃, and the viscosity is less than 0.18Pa.s at 1350 ℃.
6. The corrosion-resistant alloy die casting mold flux according to any one of claims 1 to 5, wherein: the preparation method of the corrosion-resistant alloy die casting protective slag comprises the steps of uniformly mixing and melting slagging raw materials, quenching with water, cooling, drying and grinding.
7. A corrosion-resistant alloy die casting mold flux according to claim 6, wherein: the slagging raw materials comprise: limestone, soda ash, fluorite, cryolite, bauxite and magnesia.
8. Use of the corrosion-resistant alloy die casting protective slag of any one of claims 1 to 7 in die casting of Ni-based high-temperature corrosion-resistant alloy electrode ingots.
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Application publication date: 20220107 |