CS239571B1 - Casting powder into crystallizer of a continual steel casting - Google Patents
Casting powder into crystallizer of a continual steel casting Download PDFInfo
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- CS239571B1 CS239571B1 CS837307A CS730783A CS239571B1 CS 239571 B1 CS239571 B1 CS 239571B1 CS 837307 A CS837307 A CS 837307A CS 730783 A CS730783 A CS 730783A CS 239571 B1 CS239571 B1 CS 239571B1
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- Czechoslovakia
- Prior art keywords
- powder
- casting
- slag
- individually
- crystallizer
- Prior art date
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- 239000000843 powder Substances 0.000 title claims abstract description 27
- 238000005266 casting Methods 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 title claims description 10
- 239000010959 steel Substances 0.000 title claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 9
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000010436 fluorite Substances 0.000 claims abstract description 6
- 239000010881 fly ash Substances 0.000 claims abstract description 6
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 5
- 239000003245 coal Substances 0.000 claims abstract description 4
- 230000004907 flux Effects 0.000 claims abstract description 4
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000011775 sodium fluoride Substances 0.000 claims abstract description 4
- 235000013024 sodium fluoride Nutrition 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract 2
- 229910052782 aluminium Inorganic materials 0.000 claims abstract 2
- 239000002893 slag Substances 0.000 claims description 5
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 4
- 229910001610 cryolite Inorganic materials 0.000 claims description 3
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims 1
- 239000011575 calcium Substances 0.000 claims 1
- 229910052791 calcium Inorganic materials 0.000 claims 1
- 230000001050 lubricating effect Effects 0.000 abstract description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000292 calcium oxide Substances 0.000 abstract description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 abstract description 2
- 229910052700 potassium Inorganic materials 0.000 abstract description 2
- 239000011591 potassium Substances 0.000 abstract description 2
- 239000013078 crystal Substances 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000011400 blast furnace cement Substances 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- -1 shalam Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000001033 granulometry Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000010434 nepheline Substances 0.000 description 1
- 229910052664 nepheline Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 235000011181 potassium carbonates Nutrition 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Continuous Casting (AREA)
Abstract
Vynález rieši zlepšenie požadovaných vlastností liaceho prášku, najmS mazacích vlastností prášku, zvýšenia povrchové) a podpovrchove] kvality hrám alebo predvalkov pri využití širšej a dostupnejšej surovinové] základné. Liaci prášok pre uvedený účel podfa vynálezu obsahuje v hmotnostnom vyjádření 4 až 20 % uhličitanu sodného a/alebo draselného a 60 až 90 % troskotvornej zmesi, tvorenej na báze vysokopecnej trosky, popolčeka z uhlia a mangánatokremičitého zváracieho taviva, jednotlivo alebo v ich vzájomnej kombiriácii. Podstata vynálezu spočívá v tom, že obsahuje 4 až 20 % kazivca, fluoridu sodného a kryolltu jednotlivo alebo v ich vzájomnej kombinaci!, pričom troskotvorná zmes obsahuje základné troskotvorné oxidy, a to oxid vápenatý, křemičitý a hlinitý v molárnom pomere 1: 0,8 až 2,2 : 0,01 až 0,5 dielov.The present invention solves the improvements required properties of casting powder, especially lubricating powder properties, surface elevation) and sub-surface quality games or billets using a wider and more affordable raw material] basic. Casting powder for the above the purpose of the invention comprises by weight expressing 4 to 20% sodium carbonate and / or potassium, and 60 to 90% of a debris blast furnace-based blend debris, coal and manganese silicon fly ash welding flux, individually or in their mutual compilation. nature The invention is based on the fact that it comprises 4 to 10% of the invention 20% fluorspar, sodium fluoride and crystals individually or in combination with each other !, wherein the slag-forming composition comprises a base wax-forming oxides, namely calcium oxide, silica and aluminum in a molar ratio 1: 0.8 to 2.2: 0.01 to 0.5 parts.
Description
239571 3 4239571 3 4
Vynález sa týká liaceho prášku do kryšta-lizátorov plynulého odlievania ocele a riešiproblém zlepšenia všetkých požadovanýchparametrov, najma mazacích vlastností práš-ku, zvýšenia povrchovej a podpovrchovejkvality hrám alebo predvalkóv, pri využitíširšej a dostupnej surovinovej základné.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting powder for continuous casting crystallizers and to the improvement of all desired parameters, in particular the lubricating properties of the powder, the enhancement of surface and subsurface quality, or the use of a broader raw material base.
Do kryštalizátorov zariadenia pre plynuléodlievanie ocele sa na hladinu tekutej oce-le přidává prášok, ktorý má tvořit mazacífilm medzi vrstvou stuhnutej ocele a stěna-mi kryštalizátora, zabezpečovat stály a rov-noměrný přestup tepla medzi vrstvou stuh-nutej ocele a kryštalizátorom, absorbovatnekovové, hlavně oxidické vmestky, chránitpovrch tekutej ocele proti oxidácii vzduš-ným kyslíkom a zabezpečovat jej tepelnáizoláciu. Váčšina známých liacich práškov sú zme-si, založené na látkách' troskotvorných aznižujúcich viskozitu a teplotu tavenia práš-ku a na regulátorech rýchlosti tavenia práš-ku. Ako troskotvorné zložky sa používajúportlandský alebo vysokopecný cement, ša-mot, vápenec, vápno, křemičitý piesok, ba-zalt, sklo, nefelín a ďalšie. Na znižovanieviskozity a teploty tavenia sa pridávajúzložky ako kazivec, kryolit, fluorid sodný,uhličitan sodný, uhličitan draselný a borax.Ako regulátor rýchlosti tavenia sa používámletý koks, sadze, práškový grafit a iné. Vzávislosti od druhu a množstva použitýchzložiek je chemické zloženie práškov vel-mi rozmanité. Vačšina má bazicitu, vyjádře-ná pomerom oxidu vápenatého a oxidu kře-mičitého, blízku hodnotě 1. Medzi najdole-žitejšie fyzikálně vlastnosti liacich práškovpřitom patria teplota a interval tavenia, rých-losť roztavenia, viskozita, granulometrickézloženie, povrchové napatie. Troska, vytvoře-ná z liaceho prášku, preniká medzi vrstvu te-kutej ocele a steny kryštalizátora, pričom pů-sobí ako mazadlo znižujáce trecie sily a eró-ziu stien kryštalizátora. Přitom ak přestuptepla je příliš nízký, potom vytvořená vrstvastuhnutej ocele je velmi tenká a může na-stat pretrhnutie prádu ocele; naopak pří-liš vysoká rýchlosť odvodu tepla může spů-sobovat povrchové trhliny bramy; Výsledky merania trecej sily súčasne po-užívaných liacich práškov s uvedenou bázi-citou ukazujá, že prudké zvýšenie trecej si-ly vzniká pri teplotách 1 000 až 1 300 °C. Podtouto přechodovou teplotou, ktorá pre vač-šinu trosiek zodpovedá začiatku kryštalizá-cie, trosky nemůžu ďalej působit ako ma-zadlo. Takéto chovanie je spůsobené krys-talickou precipitáciou počas chladenia troš-kové j taveniny a má za následdk zhoršenieaž stratu mazecej schopnosti a tým zvýšenámožnost tvorby povrchových vád. Ďalšou nevýhodou VSčšiny týchto práš-kov je, že na ich přípravu sa používajú hyd-roskopické zložky, ako mleté vápno a port-landský alebo vysokopecný cement, ktorémůžu spůsohovať hrudkovanie práškov. Pripoužití mletého vápenca sa naviac v kryšta- lizátore uvoíňu jú plynné zložky, ktoré mů-žu mať nepriaznivý vplyv na povrchová kva-litu výrobku.A powder to form a lubricating film between the solidified steel layer and the crystallizer walls is added to the liquid steel surface in the crystallizer of the continuous-flow device to provide a constant and uniform heat transfer between the solid-steel layer and the crystallizer, absorbed by the metal. oxidic inclusions, to protect the surface of the liquid steel against oxidation with air oxygen and to ensure its thermal insulation. Most of the known casting powders are based on the wax-forming and viscosity-reducing melting point and powder melt controllers. As the slag-forming components, Portland or blast-furnace cement, shalam, limestone, lime, quartz sand, ba-zalt, glass, nepheline and others are used. Components such as fluorspar, cryolite, sodium fluoride, sodium carbonate, potassium carbonate and borax are added to reduce the viscosity and melting temperature. Coke, carbon black, graphite powder, and others are used as the melt regulator. Depending on the type and amount of ingredients used, the chemical composition of the powders is very diverse. Most have a basicity, expressed in terms of calcium oxide and silica, of close to 1. The most important physical properties of powder powders include temperature and melting interval, melt speed, viscosity, granulometry, surface tension. The slag formed from the casting powder penetrates between the hot steel layer and the crystallizer wall, acting as a lubricant reducing the frictional forces and erosion of the crystallizer walls. In this case, if the transfer is too low, the layered steel formed is very thin and can break the laundry of the steel; conversely, the excessively high heat dissipation rate can cause slab surface cracks; The results of the frictional force measurements of the currently used casting powders with the indicated base indicate that the frictional increase in friction is produced at temperatures of 1000 to 1300 ° C. By this transition temperature, which for most debris corresponds to the onset of crystallization, the debris can no longer act as a mullion. Such behavior is due to crystalline precipitation during the cooling of the melt and consequently deteriorates the loss of lubricating capacity and thereby increases the possibility of surface defects. Another disadvantage of most of these powders is that they use hygroscopic components, such as ground lime and portland or blast furnace cement, to aid in the clumping of powders. In addition, the use of ground limestone in the crystallizer is released by gaseous constituents which may adversely affect the surface quality of the product.
Uvedené nedostatky odstraňuje a problémrieši liaci prášok pre uvedený áčel podl'avynálezu, obsahujáci v hmotnostnom vyjád-ření 4 až 20 % uhličitanu sodného a/alebodraselného a 60 až 90 % troskotvornej zme-si, tvorenej na báze vysokopecnej trosky,popolčeka z uhlia a mangánatokremičitéhozváracieho taviva jednotlivo alebo v ichvzájomnej kombinácii. Mangánatokremičitézváracie tavivo obsahuje 35 až 45 % hmot.oxidu křemičitého, 35 až 40 °/o hmot. oxidumanganatého a ako ďalšie zložky oxid tita-ničitý, oxid vápenatý, oxid hlinitý a fluoridvápenatý. Podstata vynálezu spočívá v tom,že obsahuje 4 až 20 % kazivca, fluoridu sod-ného a kryolitu jednotlivo alebo v ich vzá-jomnej kombinácii, pričom troskotvornázmes obsahuje základné troskotvorné oxi-dy, a to oxid vápenatý, křemičitý a hlinitýv molárnom pomere 1: 0,8 až 2,2 : 0,01 až0,5 dielov. Výsledná zmes připraveného lia-ceho prášku musí obsahovat menej ako 1 %hmot. vlhkosti a obsah frakcie nad 0,1 mmpod 10 % hmotnostných. Výhody liaceho prášku podlá vynálezu sáhlavně v tom, že má menšiu tendenciu kukryštalickej precipitácii počas chladenia ta-veniny, čím sa udržiava přítomnost tekutejtrosky na čo najvačšom povrchu ocele vkryštalizátore, a to až do najnižších po-vrchových teplůt pri výstupe z kryštalizáto-ra. Sáčasne sa zabezpečujá optimálně maza-cie účinky, optimálny přestup tepla a týmdobrá povrchová a podpovrchová kvalitabrám alebo predvalkóv, pri podstatnom zní-žení výrobných ťažkostí. Prášok podlá vy-nálezu neobsahuje hydroskopické zložky,zvyšujáce náchylnost prášku k hrudkova-niu a okrem uhličitanov. neobsahuje inézložky, ktoré by uvolňovali plynné produk-ty a spůsobovali objemové změny práškuv kryštalizátore. Výhodou je tiež, že prá-šok sa může připravit prevážne z odpado-vých produktov, ako vysokopecná troska apopolček z uhlia, čím sa rozšiřuje surovino-vá tzákladňa a odstraňuje potřeba energickynáročných výrobkov, ako je cement alebovápno. Přitom odpadá nutnost přídavku re-tardérov rýchlosti tavenia, ako sú sadze,mletý koks, grafit a pod., prétože elemen-tárny uhlík je obsiahnutý v popolčeku. Váč-šina zložiek liaceho prášku podlá vynálezu,ako popolček, flotovaný kazivec a uhličitany,sú v práškovej formě, čím odpadá potřebaenergie na ich mletie. Příklady uskutočnenia vynálezu:PřikladlThe above drawbacks are solved by the casting powder for the present invention, comprising from 4 to 20% by weight sodium carbonate and / or potassium and 60 to 90% by weight of blast furnace slag, coal fly ash and manganese silicon wastes. fluxes individually or in combination with each other. The manganese silicon welding flux contains 35 to 45% by weight of silica, 35 to 40% by weight. and other titanium dioxide, calcium oxide, alumina, and fluoride calcium. SUMMARY OF THE INVENTION It is an object of the present invention to provide 4 to 20% fluorspar, sodium fluoride and cryolite individually or in combination with one another, wherein the slag-forming composition comprises basic wax-forming oxides, namely calcium oxide, silica and alumina with a molar ratio of 1: 0.8 to 2.2: 0.01 to 0.5 parts. The resulting blend of the prepared powder must contain less than 1 wt. moisture content and a fraction content above 0.1 mm under 10% by weight. Advantages of the casting powder according to the invention in the fact that it has a lesser tendency to crystallize during coolant cooling, thus maintaining the presence of liquid slag on the highest possible surface of the steel in the crystallizer, up to the lowest surface temperatures at the outlet of the crystallizer. At the same time, optimally lubricating effects, optimum heat transfer and good surface and subsurface quality or pre-wax are assured with substantial reduction of manufacturing difficulties. The powder according to the invention does not contain hygroscopic components, it increases the susceptibility of the powder to clumping and in addition to carbonates. it does not contain other components that would release gaseous products and cause volumetric changes in the powder in the crystallizer. It is also advantageous that the powder can be prepared predominantly from waste products, such as blast furnace slag and coal coals, thereby extending the raw material base and eliminating the need for energy-intensive products such as cement or bulk. There is no need for the addition of melt speed regulators such as carbon black, ground coke, graphite, etc., but the carbon is contained in the fly ash. Most of the casting powder components of the invention, such as fly ash, flotated fluorspar, and carbonates, are in powder form, eliminating the need for energy to grind them. EXAMPLES: EXAMPLE
Liaci prášok je připravený zmiešaním 10 %hmot. uhličitanu sodného, 10 % hmot. Ho-tovaného kazivca, 36 % hmot. popolčeka zuhlia a 44 % hmot. mletej vysokopecnejThe casting powder is prepared by mixing 10 wt. % sodium carbonate, 10 wt. % Of the fluorspar, 36 wt. charcoal fly ash and 44 wt. ground blast
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS837307A CS239571B1 (en) | 1983-10-06 | 1983-10-06 | Casting powder into crystallizer of a continual steel casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS837307A CS239571B1 (en) | 1983-10-06 | 1983-10-06 | Casting powder into crystallizer of a continual steel casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CS730783A1 CS730783A1 (en) | 1985-06-13 |
| CS239571B1 true CS239571B1 (en) | 1986-01-16 |
Family
ID=5421944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS837307A CS239571B1 (en) | 1983-10-06 | 1983-10-06 | Casting powder into crystallizer of a continual steel casting |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS239571B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2260494C1 (en) * | 2004-01-26 | 2005-09-20 | Открытое акционерное общество "Новокузнецкий металлургический комбинат" | Slag-forming mixture for continuous casting rail steel |
-
1983
- 1983-10-06 CS CS837307A patent/CS239571B1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2260494C1 (en) * | 2004-01-26 | 2005-09-20 | Открытое акционерное общество "Новокузнецкий металлургический комбинат" | Slag-forming mixture for continuous casting rail steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CS730783A1 (en) | 1985-06-13 |
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