EP0255450B1 - Vorrichtung zur Gasschützung eines flüssigen Metallgiessstrahls - Google Patents

Vorrichtung zur Gasschützung eines flüssigen Metallgiessstrahls Download PDF

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Publication number
EP0255450B1
EP0255450B1 EP87401801A EP87401801A EP0255450B1 EP 0255450 B1 EP0255450 B1 EP 0255450B1 EP 87401801 A EP87401801 A EP 87401801A EP 87401801 A EP87401801 A EP 87401801A EP 0255450 B1 EP0255450 B1 EP 0255450B1
Authority
EP
European Patent Office
Prior art keywords
carbon dioxide
steel
mold
casting
gas
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
EP87401801A
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English (en)
French (fr)
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EP0255450A3 (en
EP0255450A2 (de
Inventor
Guy Savard
Robert Gum Hong Lee
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.)
Air Liquide Canada Inc
Original Assignee
Air Liquide Canada Inc
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 Air Liquide Canada Inc filed Critical Air Liquide Canada Inc
Priority to AT87401801T priority Critical patent/ATE51352T1/de
Publication of EP0255450A2 publication Critical patent/EP0255450A2/de
Publication of EP0255450A3 publication Critical patent/EP0255450A3/fr
Application granted granted Critical
Publication of EP0255450B1 publication Critical patent/EP0255450B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B22D27/003—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using inert gases
    • 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

Definitions

  • the invention relates to a method of forming a protective gas shield around the steel to prevent oxidation, when this steel is poured from a container in the form of a liquid stream until the moment when it solidifies.
  • the liquid steel produced by any of the well known methods usually contains a high oxygen content. This is detrimental to its quality.
  • the steel is calmed by introducing into the liquid steel deoxidizing agents, for example, silicon, in the form of ferrosilicon, or aluminum or these two substances at the same time. This is usually done in a transfer pocket, on casting.
  • the quenched liquid steel has a strong affinity for oxygen, which it absorbs when it is exposed to the atmosphere, when it is poured into ingot molds, to form billets. or slabs. This results in defects in the resulting steel.
  • liquid argon is poured into the molds.
  • the argon evaporates when it comes into contact with the liquid steel and isolates the latter from the atmosphere during the rest of the casting in the ingot mold.
  • the main drawbacks of this process are that the storage and transport of the equipment is difficult to adapt to the severe working conditions of the casting platform and, moreover, the cost of argon is high, relatively at the price of normal steel grades.
  • Another method uses liquid nitrogen to form a protective shield for the stream of liquid steel as it is cast in a continuous casting machine.
  • This process is described in the brochure entitled "Conspal Surface Protection” published by Concast AG, Zurich, Switzerland, March 1977, as well as in US Patent No. 4,178,980, issued in the name of L'Air Liquide.
  • liquid nitrogen gives a degree of protection which provides a good improvement compared to other processes.
  • handling this substance under the harsh conditions of the casting platform makes it difficult in some cases to obtain continuity of the casting during the operation.
  • carbon dioxide C0 2
  • C0 2 carbon dioxide
  • Patent DE-A 2 040 504 describes the use of carbon monoxide CO so as to maintain a reducing atmosphere above the molten metal, on the one hand, and the reduction of the iron oxide FeO contained in the metal bath by injecting CO into said metal bath, on the other hand.
  • the Applicant has found that the kinetics of the reactions are such that, on coming into contact with liquid steel, and although the carbon dioxide decomposes at the gas-metal interface, a negligible quantity of oxygen dissolves in the metal and the carbon monoxide formed behaves like a screen layer at the gas-metal interface. Not only is oxidation considerably reduced compared to the level it would reach in the absence of a shielding layer between the metal and the atmosphere, but also absorption of nitrogen and hydrogen (from moisture from air) by liquid steel. The absorption of oxygen from decomposition is less than about 60 parts per million and can be reduced to 40 parts per million. Carbon dioxide is therefore capable of forming an effective screen between liquid steel and the surrounding atmosphere when this steel is poured from a container in the form of a liquid stream until it solidifies, which considerably reduces the rate of oxidation.
  • a protective carbon dioxide screen is formed around the stream of liquid steel, close to its source, and this screen is kept in contact with the steel until the latter is solidifies.
  • the general criteria to be observed for the use of carbon dioxide as a protective screen are generally the same as in the case of the use of argon or other inert gases.
  • the ingot mold is purged in advance using carbon dioxide to remove the oxygen and to form an anhydride atmosphere in the ingot mold. carbon dioxide into which and through which the steel is poured.
  • the oxygen content of the mold, before casting can be reduced to less than 3% by volume, and preferably, to 1% at most.
  • the protective screen can be formed by means of an annular ramp pierced with outlet orifices which are arranged around the stream of liquid steel, close to its source, for delivering carbon dioxide in the form of jets. which come together to form a cover that follows the surface of the steel stream.
  • an annular distribution ramp can surround the outlet nozzle of the ladle.
  • the steel forming the liquid stream is usually at a temperature between 1,625 ° C and 1,650 ° C.
  • the invention also relates to the use of mixtures of argon and carbon dioxide in steel casting to prevent oxidation.
  • FIG. 1 represents a pocket A containing liquid steel which is poured into an ingot mold B.
  • a protective gas composed of carbon dioxide, is conveyed through an annular distribution ramp (represented in FIG. 4), supplied by a supply line 15.
  • An ingot mold 8 1 which waits its turn to receive the liquid steel, is shown while receiving carbon dioxide purge gas via a line 17 and the following ingot molds Bi and B 2 wait their turn to be processed.
  • each of the molds Before entering the treatment phase, each of the molds is provided with a cap 19 formed of an aluminum film.
  • the cap 19 has been torn locally to form an opening for the introduction of the gas pipe.
  • FIG. 2 shows, in a more detailed manner, the ingot mold B 1 during purging with carbon dioxide.
  • Line 17 is passed through an opening 20 in the aluminum foil cap and it ends in a nozzle 18 through which carbon dioxide is introduced into the bottom of the mold to move the air and replace it with a carbon dioxide atmosphere.
  • the mold 8 1 has a wall 22 which encloses a molding cavity 23 of decreasing section.
  • the base of the wall 22 is supported on a corrugated metal interlayer 24, which is itself supported by the plate of a carriage C and is intended to form a seal between the base of the wall 22 and the plate of the carriage, by letting a certain quantity of carbon dioxide gas escape laterally.
  • Carbon dioxide is injected into the ingot mold Bi until this ingot mold has an oxygen content of not more than 3%, and preferably not more than 1%.
  • the mold is now ready for casting. It is then brought to the position of the mold B and the casting operation is carried out as described with reference to FIG. 4.
  • a valve arranged in the pocket A is opened, by means of a remote control, for allow the liquid steel to flow through an outlet passage 25 formed in the pocket A and pass in the form of a vertical current at the level of a protective gas diffuser 27.
  • the diffuser 27 is supplied with gaseous carbon dioxide by a pipe 15, which has the effect that a gas screen surrounds the stream of liquid metal and accompanies the latter when it enters the carbon dioxide atmosphere contained in the ingot mold B.
  • the liquid steel is isolated from the atmosphere by a continuous curtain of carbon dioxide.
  • the valve of the ladle is closed to stop the flow of liquid metal and the next ingot mold and the ladle are brought into positions of mutual alignment so that this ingot mold receives its liquid steel content.
  • equipment which is substantially as shown in FIG. 4.
  • a bag is used having a capacity of 50 tonnes and ingot molds each having a capacity of 8 to 9 tonnes.
  • the pocket has a circular opening or nozzle with a diameter of 5 to 6.5 cm.
  • Each mold has a depth of 240 to 260 cm. The distance from the bottom of the nozzle to the upper surface of the mold is 75 cm.
  • Each ingot mold rests on a trolley-mounted interlayer, of the type used to evacuate the solidified ingots from the casting station.
  • the bag is equipped with a perforated circular ramp, located just below the nozzle and capable of forming a protective screen for carbon dioxide gas.
  • This ramp is connected to a continuous source of carbon dioxide gas supply.
  • the installation includes conventional equipment for purging the ingot mold by means of carbon dioxide gas.
  • each mold is purged using carbon dioxide gas, at a rate of 2.8 cubic meters per minute, to expel the air from inside the mold.
  • the air is expelled from the interior of the ingot mold by the carbon dioxide purge at a flow rate of 2265 to 2832 liters / minute (80 to 100 sefm standard cubic foot minute), for approximately 3 minutes before the casting of each ingot .
  • a rubber hose with a protective asbestos coating is introduced into the mold, through the aluminum film, so that the diffuser plunges as low as possible, as shown in Figure 2.
  • the gas flow is extended to the air has been expelled from the mold, to such an extent that the concentration of oxygen in the mold does not exceed 1% by volume.
  • the gas injection is extended to an instant immediately preceding the pouring into this ingot mold, this to take account of the gas leak between the ingot mold and its interlayer.
  • the molds are prepared for casting according to the following procedure.
  • a strong jet of compressed air is projected onto the interlayer to remove any free particles from it.
  • a coating composed of a dispersion of cement in dilute phosphoric acid is then applied to the interlayer.
  • Four strips of corrugated steel sheet of approximately 150 mm x 750 mm 1.6 mm are placed on the interlayer, in a square or a rectangle.
  • an oblong chimney made of thin sheet steel, measuring approximately 500 mm x 1,000 mm x 1,250 mm, to reduce the intensity of projections to the time of the start of the pouring of liquid metal into the mold.
  • Exothermic “boards” hot elevators or "hot tops" are fixed on the upper end 12 ′ of the internal surface of the ingot mold, these boards generating heat by coming into contact with the liquid steel, this for to slow the cooling at the part of the ingot, and to thereby reduce the depth of the recess formed in the upper part of this ingot and which must be cut before the subsequent rolling.
  • a thin aluminum foil cap is placed over the top of the mold to limit exposure to the atmosphere before the mold has been purged with carbon dioxide.
  • the liquid steel punctures a small hole in the thin aluminum sheet, thereby reducing the amount of ambient air that is drawn into the mold.
  • the temperature of the current steel is from 1,625 ° C to 1,650 ° C.
  • a screen of carbon dioxide is formed near the source of the current, that is to say say just below the bottom of the pocket, under the nozzle.
  • the screen formed around the current of liquid steel is entrained with the steel and forms a protective screen insulating from the atmosphere from the moment the steel leaves the nozzle until its impact in the mold.
  • the carbon dioxide flow rate sent to the screen is 2.8 cubic meters per minute.
  • the pocket containing the 50 tonnes of steel is positioned above the first ingot mold, already purged and the flow of screen gas is put into action.
  • the purge pipe was previously transferred to the second ingot mold without interrupting the flow of gas.
  • the valve is open to start casting (see Figure 4). At times, the nozzle is blocked by solidified metal or by slag. In each case, it is necessary to inject oxygen to the lance to clear the nozzle (see Figure 4).
  • C0 2 gas is used at the two injection points (purging and forming a screen).
  • a device is therefore used which has a vaporization capacity to provide a flow rate comparable to that of an inert gas, for example argon.
  • the composition of the CO 2 feed is shown in Figure 5.
  • the ingot mold is filled and the valve is closed (for approximately 20 to 30 seconds) while the crane operator positions the pocket above the second ingot mold. During this time, the purge gas pipe is transferred to the next ingot mold and the valve is opened again to fill the mold that has just been purged. The sequence is continued until the pocket is emptied of its metal charge.
  • each mold is allowed to cool, in the conventional manner, with a neck che of protective flux on its surface, so as to form a solid ingot.
  • the ingot molds are then emptied of their ingots.
  • Each ingot is hot rolled into a strip, according to standard practice, then subjected to ultrasonic control for the detection of surface defects.
  • the acceptable strip was then rolled into a sheet and the sheet was then made into a helically welded tube. The tube was then subjected to ultrasonic testing for fault detection.
  • the gas flow rate was 2.8 cubic meters per minute in the case of carbon dioxide and 2.8 cubic meters per minute in the case of l 'argon.
  • Each mold was purged for approximately 2 minutes and the stream of liquid metal was protected for the duration of the casting operation, approximately 25 minutes.
  • this gas constitutes an extremely useful gas when used according to the invention.
  • Carbon dioxide is heavier than air (1.5: 1) unlike argon (1.5: 2) and therefore it maintains an effective protective screen longer than lighter gases since it does not does not disperse into the atmosphere as easily.
  • Carbon dioxide can be used in the form of carbon dioxide snow to provide a concentrated form of C0 2 gas for the use of the ingot mold in ingot casting or in the ingot mold of a continuous casting installation.

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  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Continuous Casting (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Glass Compositions (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Coating With Molten Metal (AREA)
  • Air Bags (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)
  • Ink Jet (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Laminated Bodies (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Percussion Or Vibration Massage (AREA)

Claims (1)

  1. Vorrichtung zur Herbeiführung eines gasförmigen Schutzes für einen Strahl von geschmolzenem Metall, das aus einem oberen Gefäß (A) vergossen wird, welches an seinem unteren Teil mit einem Öffnungs- und Verschließsystem versehen ist, das das Abfließen des Metallstrahls in ein unteres Gefäß (B1) gestattet, welches mit einer Öffnung für die Aufnahme des bei geöffnetem Öffnungs- und Verschließsystem vergossenen Metalls versehen ist, wobei eine Schutzgashülle um den Strahl des geschmolzenen Metalls herum gebildet ist, um diesen beim Abfließen des Metallstrahls in das untere Gefäß gegen Verunreinigungen aus der umgebenden Atmosphäre zu schützen, dadurch gekennzeichnet, daß sie aufweist:
    - eine in dem unteren Gefäß, das Abstichloch umgebend, angeordnete Einrichtung (15) zum Einspritzen von gasförmigem Kohlendioxid um den Gießstrahl;
    - eine Einrichtung (17) zum Einspritzen von gasförmigem Kohlendioxid in das untere Gefäß zum Ausblasen des Gefäßes;
    - einen Behälter, der in seinem unteren Teil flüssiges Kohlendioxid und in seinem oberen Teil gasförmiges Kohlendioxid enthält;
    - eine Einrichtung zum Entnehmen des flüssigen Kohlendioxids aus dem unteren Teil des Behälters, zum Verdampfen des Kohlendioxids und zum Einspritzen des Kohlendioxids in den oberen Teil des Behälters, um das entnommene Gas zu ersetzen;
    - eine Leitung in dem oberen Teil des genannten Behälters zum Heranführen des gasförmigen Kohlendioxids an die Einrichtung zum Einspritzen von Kohlendioxidgas um den Gießstrahl und an die Einrichtung zum Einspritzen von Kohlendioxidgas in das untere Gefäß;
    - eine Einrichtung zum Steuern des Einspritzens von Kohlendioxid in das zweite Gefäß zum Ausblasen dieses Gefäßes vor dem Vergießen des Metalls;
    - eine Einrichtung zum Steuern des Einspritzens von Kohlendioxid um den von dem ersten Gefäß abfließenden Metallgießstrahl.
EP87401801A 1984-02-24 1985-02-22 Vorrichtung zur Gasschützung eines flüssigen Metallgiessstrahls Expired - Lifetime EP0255450B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87401801T ATE51352T1 (de) 1984-02-24 1985-02-22 Vorrichtung zur gasschuetzung eines fluessigen metallgiessstrahls.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA448241 1984-02-24
CA448241 1984-02-24

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP85400326A Division EP0154585A3 (de) 1984-02-24 1985-02-22 Verfahren zum Giessen eines flüssigen Metalles
EP85400326.6 Division 1985-02-22

Publications (3)

Publication Number Publication Date
EP0255450A2 EP0255450A2 (de) 1988-02-03
EP0255450A3 EP0255450A3 (en) 1988-05-18
EP0255450B1 true EP0255450B1 (de) 1990-03-28

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Family Applications (2)

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EP85400326A Withdrawn EP0154585A3 (de) 1984-02-24 1985-02-22 Verfahren zum Giessen eines flüssigen Metalles
EP87401801A Expired - Lifetime EP0255450B1 (de) 1984-02-24 1985-02-22 Vorrichtung zur Gasschützung eines flüssigen Metallgiessstrahls

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EP85400326A Withdrawn EP0154585A3 (de) 1984-02-24 1985-02-22 Verfahren zum Giessen eines flüssigen Metalles

Country Status (8)

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US (1) US4614216A (de)
EP (2) EP0154585A3 (de)
JP (1) JPS60203338A (de)
AT (1) ATE51352T1 (de)
AU (1) AU573779B2 (de)
DE (1) DE3576792D1 (de)
ES (1) ES8602460A1 (de)
ZA (1) ZA85911B (de)

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FR2607039B1 (fr) * 1986-11-26 1989-03-31 Air Liquide Procede de coulee d'acier comportant un inertage du bain d'acier par de l'anhydride carbonique sous forme de neige
US4723997A (en) * 1987-04-20 1988-02-09 L'air Liquide Method and apparatus for shielding a stream of liquid metal
FR2623890B1 (fr) * 1987-11-26 1990-03-30 Air Liquide Lance a neige carbonique pour la metallurgie
DE3904415C1 (de) * 1989-02-14 1990-04-26 Intracon Handelsgesellschaft Fuer Industriebedarf M.B.H., 6200 Wiesbaden, De
DK0544967T3 (da) * 1991-11-28 1995-10-16 Von Roll Ag Fremgangsmåde til at undertrykke støv og røg ved fremstillingen af elektrostål
US5487005A (en) 1994-02-07 1996-01-23 Eaton Corporation Method/system for determination of gross combined weight of vehicles equipped with electronic data links
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
US20080184848A1 (en) 2006-08-23 2008-08-07 La Sorda Terence D Vapor-Reinforced Expanding Volume of Gas to Minimize the Contamination of Products Treated in a Melting Furnace
US20090064821A1 (en) * 2006-08-23 2009-03-12 Air Liquide Industrial U.S. Lp Vapor-Reinforced Expanding Volume of Gas to Minimize the Contamination of Products Treated in a Melting Furnace
US8403187B2 (en) * 2006-09-27 2013-03-26 Air Liquide Industrial U.S. Lp Production of an inert blanket in a furnace
US8932385B2 (en) 2011-10-26 2015-01-13 Air Liquide Industrial U.S. Lp Apparatus and method for metal surface inertion by backfilling
MX350453B (es) 2011-11-17 2017-09-07 Nucor Corp Método de fundición continua de tira de acero delgada.
CN114769545B (zh) * 2020-11-25 2024-03-01 宝钢德盛不锈钢有限公司 一种减少200系不锈钢热轧卷边部山鳞的生产方法

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Also Published As

Publication number Publication date
ZA85911B (en) 1985-09-25
JPS60203338A (ja) 1985-10-14
AU3904285A (en) 1985-09-05
EP0255450A3 (en) 1988-05-18
ES540622A0 (es) 1985-12-01
EP0154585A2 (de) 1985-09-11
DE3576792D1 (de) 1990-05-03
EP0255450A2 (de) 1988-02-03
ES8602460A1 (es) 1985-12-01
EP0154585A3 (de) 1986-02-26
US4614216A (en) 1986-09-30
AU573779B2 (en) 1988-06-23
ATE51352T1 (de) 1990-04-15

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