EP0274290B1 - Stahlgussverfahren mit Schutz des Stahlbades durch Kohlendioxydschnee - Google Patents

Stahlgussverfahren mit Schutz des Stahlbades durch Kohlendioxydschnee Download PDF

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Publication number
EP0274290B1
EP0274290B1 EP87402629A EP87402629A EP0274290B1 EP 0274290 B1 EP0274290 B1 EP 0274290B1 EP 87402629 A EP87402629 A EP 87402629A EP 87402629 A EP87402629 A EP 87402629A EP 0274290 B1 EP0274290 B1 EP 0274290B1
Authority
EP
European Patent Office
Prior art keywords
dry ice
liquid
casting
distributor
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87402629A
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English (en)
French (fr)
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EP0274290A1 (de
Inventor
Jean Foulard
Raymond Borasci
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carboxyque Francaise SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Carboxyque Francaise SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carboxyque Francaise SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Carboxyque Francaise SA
Priority to AT87402629T priority Critical patent/ATE53519T1/de
Publication of EP0274290A1 publication Critical patent/EP0274290A1/de
Application granted granted Critical
Publication of EP0274290B1 publication Critical patent/EP0274290B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/106—Shielding the molten jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/08—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like for bottom pouring

Definitions

  • liquid metal is in contact with the atmosphere.
  • the nitriding and / or oxidation phenomenon mentioned above lasts from 45 seconds to approximately 4 minutes depending on the size and shape of the distributor.
  • the metal poured into the distributor before immersion of the nozzle is thus more or less strongly oxidized and / or nitrided and the steel billets or ingots formed from this metal do not have the desired metallurgical qualities.
  • argon is a relatively expensive gas and a more economical solution is currently being sought which makes it possible to obtain metallurgical results substantially identical to those obtained when using liquid argon, and it has been proposed to use carbon dioxide in the gaseous state or in the form of carbon dioxide snow, as described in EP-A-0 196 952 which proposes this application essentially for the transfer of liquid steel from a converter in a pocket, or in the EP 0 154 585, on which the preamble of claim 1 is based, which proposes this application essentially for the transfer of liquid steel from a pocket to ingot molds.
  • the objective of the present invention is to apply the technique of protection by dry ice, or liquid argon, to this type of receptacles while ensuring the greatest protection efficiency, without however involving carbon dioxide flow rates. or prohibitive argon, and this objective is achieved in that the injection of carbon dioxide snow and / or liquid argon during casting takes place near the bottom of the distributor, in a confined space around a pouring nozzle delimited by vertical walls and the injection of carbon dioxide snow and / or liquid argon is continued until immersion in the liquid metal of the lower end of the nozzle.
  • This implementation of the protection technique therefore makes it possible to act where the risk of re-nitriding is the greatest, that is to say in the vicinity of the casting jet foot where strong turbulence occurs, in particular of air, associated with large movements of liquid metal.
  • the injection of dry ice and / or liquid argon ends as soon as the lower end of the nozzle is substantially immersed in the liquid metal.
  • a flow of dry ice or sequential or continuous liquid argon can be maintained until the end of the casting. In general, the maintenance flow during casting is at most equal to about 50% of the purge flow.
  • the quantity of carbon dioxide snow injected is between 0.2 and 5 kg per tonne of metal poured.
  • the purging step has a duration of between 30 seconds and 90 seconds approximately, with a dry ice flow rate of 15 kg to 50 kg per minute, while the injection of dry ice during casting continues for a duration between 30 seconds and 90 seconds approximately with a dry ice flow of 15 kg to 50 kg per minute.
  • FIG. 1 represents a schematic view of the various stages of production of a steel ingot.
  • this steel is produced either from a blast furnace 1 delivering cast iron which is refined in an oxygen converter 2, or from an electric arc furnace 3 using scrap as starting material, l 'steel produced being in both cases poured into a pocket 4, this pocket serving to feed a distributor 7 provided with several orifices 8, 9 placed above ingot molds 10, 11 of continuous casting.
  • the distributor 7 is regularly supplied by pockets 4 during a sequence or by a single pocket 4 when continuous casting is carried out pocket by pocket.
  • the liquid metal may be subjected to oxidation and / or nitriding.
  • the jet of liquid metal can be oxidized and / or nitrided from the start of the pouring of the electric oven into the ladle. It is therefore generally desirable to provide inerting of the liquid metal at the level of the pocket.
  • the distributor 7 is provided with orifices 8 and 9 allowing the pouring of the liquid metal into the ingot molds 10 and 11.
  • the jet of liquid metal is also, at this location, subjected to the action of the surrounding amosphere, causing oxidation and / or nitriding.
  • FIG. 2 a view in partial section of a distributor 7 above which has been placed.
  • a bag 4 provided with a nozzle 12.
  • Means 13, 14, 15 are provided for injecting carbon dioxide snow or liquid argon: the reservoir 13 of liquid carbon dioxide (or liquid argon) is connected to the lance 15 by means of a valve 14 (and a nozzle not shown) through which the expansion of the liquid carbon dioxide takes place in the form of snow which is projected into the area 20 of the distributor.
  • the argon remains in the liquid state when passing through the valve 14.
  • the latter essentially comprises a side wall 25 and a bottom wall 16 into which flow orifice openings 8.
  • a small wall 17 is placed opposite the wall 25 relative to the pouring orifice 8 while a baffle 18 is placed in the upper part of the distributor, but slightly offset from the wall, and further from the orifice 8 that said low wall 17.
  • the nozzle 12 of the pocket 4 is arranged in the example of the embodiment of FIG. 2, between the two low walls 18 (one of which is not shown in the figure) of so that said nozzle is in a zone confined by said walls 17 on the one hand, and said baffles 18 on the other hand. In the example illustrated in this FIG.
  • the lower end of the nozzle 12 is located at a distance D2 from the bottom of the distributor 16, greater than the height D1 of the wall 17, but less than the distance D3 separating the lower part of the baffle 18 of the bottom 16 of said distributor 6.
  • the end 21 of the lance 15 is preferably placed at a distance from the bottom 16 of the distributor, such that this distance is close to the distance D3, in order to allow better penetration of the snow to the bottom of the distributor when injecting it.
  • the distance D2 can be less than D1.
  • the first step of the method is carried out to purge the distributor of the air present therein. For this, we inject with the lance 15, the end of which is placed as described above, a large quantity of carbon dioxide snow, sufficient so that under the casting conditions (cold or hot distributor before the start carbon dioxide snow is deposited at least partially at the bottom of the distributor, in area 20, located around the lower part of the nozzle 12 and extending to the wall 17.
  • the end of the purge operation triggers the ladle to flow into the distributor. It is indeed very important that the liquid metal flows as soon as this purge flow ends in the distributor because, if it is otherwise, there is a relatively rapid rise in the oxygen concentration, within 1 about one minute. It will therefore be possible, in certain cases, to maintain this high purge flow for a few moments after having started the casting operation in the distributor, or to repeat the purging operation in the event of incidents, at the outlet of the bag, it happens.
  • the carbon dioxide snow present in the zone 20 sublimes quickly but a thickness of snow is maintained by injection of carbon dioxide snow by the lance 15, according to a second flow, or flow maintenance, lower than the purge flow.
  • This flow rate must however be sufficient for snow to cover the liquid metal during the progressive filling of the distributor, including when this liquid metal reaches a level greater than the height D1 of the wall and then spreads quickly throughout the distributor.
  • This holding flow in the form of a constant or substantially regularly decreasing flow, is maintained until the lower end 22 of the nozzle 12 is substantially immersed in the bath of liquid steel.
  • substantially is meant an immersion such that, taking into account the boiling and turbulence usual in this kind of casting, the lower end 22 always remains inside the liquid metal.
  • the injection of carbon dioxide in the form of snow is generally stopped on the surface of the liquid metal and the surface of the metal is covered with a protective powder or any other well-known means of l '' skilled person to limit the oxidation and / or nitriding of molten steel.
  • a protective powder any other well-known means of l '' skilled person to limit the oxidation and / or nitriding of molten steel.
  • Figure 3 is shown an alternative implementation of the method according to the invention in a distributor without a wall.
  • This containment device 36 comprises a substantially cylindrical envelope 39 provided with a plurality of openings 37, 38 of height d 4 such that the surface of the openings allows the liquid metal to flow into the distributor at a rate corresponding to that of the metal 32 through the nozzle 33, in order to avoid an overflow of the metal above the walls 39 of the device 36.
  • This cylindrical device 36 made of metal (consumable), of refractory material (not consumable) or possibly of thick cardboard (which burns slowly) is fixed by the flanges 40, 41, for example on the walls of the distributor 30.
  • the dry ice is injected, preferably symmetrically on either side of the nozzle 33, by the lances 34, 35.
  • the liquid metal level rises gradually in the distributor until the nozzle is immersed in the liquid metal, continuous casting is then generally carried out at a flow rate equal to the metal flow rate l iquid through the nozzle.
  • this diameter is limited by the width of the distributor, as well as by the snow consumption during the course. of the casting operation.
  • These openings are preferably located in the longitudinal part of the distributor, that is to say promoting a flow parallel to the walls of the latter.
  • Figure 4 is shown in 4A a schematic sectional view of another embodiment of the invention, while in 4B is shown a top view.
  • the same elements as those in FIG. 3 have the same references.
  • the distributor 30 is in the present case, a narrow distributor (of small width) but of great length.
  • the protective device is limited to two side walls 50, 51 substantially matching the shapes of the distributor, of height d6 greater, as previously, at distance d7 from the lower base of the nozzle to the bottom of the distributor.
  • Each wall has openings 56, 57 in its lower part, arranged so that they allow the flow of liquid metal in the longitudinal direction of the distributor. In FIG. 4A, these openings are placed in the lower corners of the wall 50 (and of the wall 51 - not shown in the figure).
  • Each wall 50, 51 is held by two flanges 52, 53, respectively 54.55, whose lower ends are integral with the corresponding wall and whose upper ends are wound around the corresponding side walls of the distributor 30.
  • the lances are oriented so that the dry ice jets, according to the flow rates corresponding to the invention, preferably come into contact with the metal between the nozzle and the walls 50, 51, near the jet foot and substantially in the vertical zone of the wall 50, 51 not provided with openings (56, 57), in order to improve the confinement, in particular at the start of casting.
  • the distance between the walls 50, 51 follows substantially the same rules as those defined for determining the diameter of the device 36 in FIG.
  • the distance between the walls 50, 51 must remain reasonable so that the device fulfills its confinement function. This distance can, for example, be of the same order of magnitude as the width of said walls 50, 51.
  • the purging operation is completed and a flow called "holding” is injected, between 10 and 30 kg / minute of C0 2 in the form of snow.
  • the snow is preferably injected at two points, on either side of the nozzle, until complete immersion of the latter, ie generally for approximately 40 "to 3'30".
  • Example 1 The procedure is as in Example 1 but using liquid argon instead of carbon dioxide snow.
  • the injection times are the same for the purge and hold rates respectively.
  • duration of the purging step can be slightly reduced compared to that of Example 1, the liquid argon generating the desired inerting more quickly. This duration can be between 20 and 90 seconds.
  • the flow of liquid argon during the purging step is between 15 liters / min and 30 liters / min and preferably 20 liters / min, for a preferential duration of 45 seconds, from 4 liters to 10 liters per minute and from preferably 6 liters / min during the holding step, the duration of which is at least equal to that of the casting.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Continuous Casting (AREA)

Claims (8)

1. Stahlstranggußverfahren durch Überleitung von flüssigem Stahl aus einem Behälter (4) in einen anderen Behälter (7) mit Spülung vor jeder Betätigung des zweiten Behälters (7) durch Einspritzung von Kohlensäureschnee und/oder flüssigem Argon mit anschließender Wartungsoperation zum Schutz des Flüssigmetalls im genannten zweiten Behälter (7) von der Art, bei der ein Schutz für den Stahlstrahl (32) durch Einspritzung von Kohlensäureschnee oder flüssigem Argon angewandt wird, dadurch gekennzeichnet, daß diese Anordnung auf die Überleitung von flüssigem Stahl aus einer Pfanne (4), die den ersten Behälter bildet, in einen Stranggußverteiler (7), der den zweiten Behälter bildet, Anwendung findet und daß die Einspritzung von Kohlensäureschnee während des Gießvorganges in Nähe des Bodens des Verteilers (7) in einem begrenzten Raum rund um einen Ausguß (12) (33) stattfindet, der durch vertikale Wände (17-18, Figur 2), (39, Figur 3), (50-51, Figur 4a und 4b) begrenzt wird, und daß man die Einspritzung des Kohlensäureschnees und/oder des flüssigen Argons fortsetzt, bis das untere Ausgußende (12) (33) in das Flüssigmetall eingetaucht ist.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Einspritzung des Kohlensäureschnees oder des flüssigen Argons endet, sobald das untere Ende des Ausgusses (11) (33) im wesentlichen in das flüssigen Metall eingetaucht ist.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Oberfläche des Flüssigmetallbades einige Momente vor Ende der Einspritzung von Kohlensäureschnee und/oder Flüssigargon im Verteiler von einem an sich bekannten Mittel zum Schutz gegen Oxidation und/oder Nitrierung bedeckt ist.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß bis zum Ende des Gießzyklus eine ununterbrochene oder kontinuierliche Kohlensäureschnee- oder Flüssigargon-Durchsatzleistung aufrechterhalten wird.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die genannte Dauerleistung während des Gießzyklus höchstens ca. 50% der Spülleistung entspricht.
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die eingespritzte Kohlensäureschneemenge zwischen 0,2 und 5 kg je Tonne gegossenen Metalls beträgt.
7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Spülphase eine Dauer zwischen etwa 30 und 90 Sekunden hat, bei einer Kohlensäureschnee-Durchsatzleistung von 15 bis 50 kg je Minute.
8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Kohlensäureschnee-Einspritzung während des Gießzyklus während eines Zeitraums vonstatten geht, der zwischen ca. 30 Sekunden und 90 Sekunden beträgt, bei einer Kohlensäureschnee-Durchsatzleistung von 15 bis 50 kg je Minute.
EP87402629A 1986-11-26 1987-11-23 Stahlgussverfahren mit Schutz des Stahlbades durch Kohlendioxydschnee Expired - Lifetime EP0274290B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87402629T ATE53519T1 (de) 1986-11-26 1987-11-23 Stahlgussverfahren mit schutz des stahlbades durch kohlendioxydschnee.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8616475 1986-11-26
FR8616475A FR2607039B1 (fr) 1986-11-26 1986-11-26 Procede de coulee d'acier comportant un inertage du bain d'acier par de l'anhydride carbonique sous forme de neige

Publications (2)

Publication Number Publication Date
EP0274290A1 EP0274290A1 (de) 1988-07-13
EP0274290B1 true EP0274290B1 (de) 1990-06-13

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EP87402629A Expired - Lifetime EP0274290B1 (de) 1986-11-26 1987-11-23 Stahlgussverfahren mit Schutz des Stahlbades durch Kohlendioxydschnee

Country Status (10)

Country Link
US (1) US4781122A (de)
EP (1) EP0274290B1 (de)
JP (1) JPS63252650A (de)
AT (1) ATE53519T1 (de)
AU (1) AU598610B2 (de)
CA (1) CA1330159C (de)
DE (1) DE3763153D1 (de)
ES (1) ES2016643B3 (de)
FR (1) FR2607039B1 (de)
ZA (1) ZA878848B (de)

Families Citing this family (14)

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Publication number Priority date Publication date Assignee Title
FR2623890B1 (fr) * 1987-11-26 1990-03-30 Air Liquide Lance a neige carbonique pour la metallurgie
US6460742B1 (en) * 1989-02-14 2002-10-08 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for reducing fume emissions during molten metal transfer
DE3904415C1 (de) * 1989-02-14 1990-04-26 Intracon Handelsgesellschaft Fuer Industriebedarf M.B.H., 6200 Wiesbaden, De
US5004495A (en) * 1990-02-05 1991-04-02 Labate M D Method for producing ultra clean steel
EP0544967B1 (de) * 1991-11-28 1995-06-14 Carbagas Verfahren zur Unterdrückung von Staub und Rauch bei der Elektrostahlherstellung
IT1257114B (it) * 1992-09-29 1996-01-05 Weber Srl Procedimento per l'ottenimento di masselli reocolati, in particolare adatti a venire utilizzati per la produzione di pressocolati ad alte prestazioni meccaniche.
EP0639650A1 (de) * 1993-08-18 1995-02-22 The Commonwealth Industrial Gases Limited Vorrichtung zum Ausbringen von Kohlendioxidschnee
AU667640B2 (en) * 1993-08-18 1996-03-28 Commonwealth Industrial Gases Limited, The CO2 snow discharge apparatus
US6228187B1 (en) 1998-08-19 2001-05-08 Air Liquide America Corp. Apparatus and methods for generating an artificial atmosphere for the heat treating of materials
US6491863B2 (en) 2000-12-12 2002-12-10 L'air Liquide-Societe' Anonyme A' Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes George Claude Method and apparatus for efficient utilization of a cryogen for inert cover in metals melting furnaces
DE102011008894A1 (de) * 2011-01-19 2012-07-19 Air Liquide Deutschland Gmbh Verfahren und Düse zur Unterdrückung einer Entwicklung von eisenhaltigem Dampf
US8932385B2 (en) 2011-10-26 2015-01-13 Air Liquide Industrial U.S. Lp Apparatus and method for metal surface inertion by backfilling
CN113941692A (zh) * 2021-09-14 2022-01-18 包头钢铁（集团）有限责任公司 一种利用二氧化碳预制中间包保护性气氛的方法
CN113953468A (zh) * 2021-09-14 2022-01-21 包头钢铁（集团）有限责任公司 一种利用钢包预加干冰防止出钢过程钢液吸氮的方法

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DE2040504C3 (de) * 1970-08-14 1973-12-13 Badische Anilin- & Soda-Fabrik Ag, 6700 Ludwigshafen Verfahren zur Verbesserung der Qualität von metallischen Gußblocken
LU70560A1 (de) * 1973-07-24 1974-11-28
FR2392746A2 (fr) * 1977-06-01 1978-12-29 Air Liquide Procede de coulee de metal
CH628547A5 (de) * 1978-06-30 1982-03-15 Fischer Ag Georg Formgussverfahren und vorrichtung zum vergiessen von metallischen formgussstuecken in einer form.
JPS57181320A (en) * 1981-04-28 1982-11-08 Nippon Steel Corp Nitrogen absorption preventing method of molten steel
FR2523005A1 (fr) * 1982-03-08 1983-09-16 Air Liquide Procede et installation de coulee d'un metal non ferreux en lingotiere
JPS58154453A (ja) * 1982-03-10 1983-09-13 Daido Steel Co Ltd 溶湯注入方法
JPS591055A (ja) * 1982-06-26 1984-01-06 Kawasaki Steel Corp 連鋳タンデイツシユへの溶鋼無酸化注入開始法
ZA85911B (en) * 1984-02-24 1985-09-25 Liquid Air Canada Molten metal casting
US4657587A (en) * 1985-02-21 1987-04-14 Canadian Liquid Air Ltd./Air Liquide Canada Ltee Molten metal casting
FR2579495B1 (fr) * 1985-04-01 1987-09-11 Air Liquide Procede de protection d'un jet de coulee de metal

Also Published As

Publication number Publication date
ES2016643B3 (es) 1990-11-16
US4781122A (en) 1988-11-01
FR2607039B1 (fr) 1989-03-31
AU8181587A (en) 1988-06-02
ZA878848B (en) 1988-05-26
FR2607039A1 (fr) 1988-05-27
ATE53519T1 (de) 1990-06-15
EP0274290A1 (de) 1988-07-13
AU598610B2 (en) 1990-06-28
DE3763153D1 (de) 1990-07-19
CA1330159C (fr) 1994-06-14
JPS63252650A (ja) 1988-10-19

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