EP0005820B1 - Procédé et dispositif pour la coulée continue des métaux selon une ou plusieurs lignes de coulée - Google Patents

Procédé et dispositif pour la coulée continue des métaux selon une ou plusieurs lignes de coulée Download PDF

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Publication number
EP0005820B1
EP0005820B1 EP79101640A EP79101640A EP0005820B1 EP 0005820 B1 EP0005820 B1 EP 0005820B1 EP 79101640 A EP79101640 A EP 79101640A EP 79101640 A EP79101640 A EP 79101640A EP 0005820 B1 EP0005820 B1 EP 0005820B1
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Prior art keywords
casting
gas
metal
mould
tube
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Expired
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EP79101640A
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German (de)
English (en)
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EP0005820A1 (fr
Inventor
Markus Schmid
Klaus Heck
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.)
SMS Concast AG
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Concast Holding AG
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Application filed by Concast Holding AG filed Critical Concast Holding AG
Priority to AT79101640T priority Critical patent/ATE1934T1/de
Publication of EP0005820A1 publication Critical patent/EP0005820A1/fr
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Publication of EP0005820B1 publication Critical patent/EP0005820B1/fr
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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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • 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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • 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
    • B22D11/14—Plants for continuous casting
    • B22D11/147—Multi-strand plants

Definitions

  • the invention relates to a process for the continuous casting of metal in single or multi-strand systems, the metal, in particular steel, being poured through a pouring tube from a casting vessel into at least one oscillating mold with a closed, pressurized, gas-filled cavity located above the mold bath level is fed into the inert gas during casting and is then deposited in a bubble in countercurrent to the metal flowing in the pouring tube upwards into the atmosphere.
  • a common mold with several individual molds arranged next to one another is known. In their upper section, these individual molds have gas-filled cavities which are connected to one another. This maintains the same gas composition and pressure. Above the individual molds there is a common attachment for receiving melt which also oscillates with the mold and which communicatively connects the individual molds. This has the advantage that the devices that move the individual strands can be driven off at the same speed.
  • a disadvantage of these known solutions is that the level of the bath level in the mold is regulated by regulating the gas pressure in the cavities above it, as a result of which inevitable fluctuations in the level of the bath occur, which lead to a deterioration in the cast product. Furthermore, complex devices for determining the bath level in the casting container upstream of the mold and devices for pressure monitoring in the cavities as well as a corresponding control device must be provided. In the previously known continuous casting method for casting small formats, such as billets, in which without throttling elements on the intermediate container, such as. B. slide or stopper, the casting speed is essentially dependent on the ferrostatic height above the spout.
  • a device for gas purging a closed mold space in which inert gas is blown into the cavity at a pressure above that of the metal column above the mold bath level. Excess gas escapes up through the pouring tube. With such a device, however, the mold bath level cannot be kept constant, especially not when the fill level in the casting vessel fluctuates.
  • gas pressure in the hollow pressure is always set automatically to a value equal to the static pressure of the metal column, regardless of the height of the metal column above the bath level in the mold, by a constant gas inflow.
  • this so-called closed casting system ensures that the bath level in the mold automatically adjusts to a certain level and remains at this level with only the slightest deviations during the entire casting process.
  • the level is determined or can be set by the corresponding height of the outlet opening of the immersed pouring tube in the mold cavity of the mold.
  • the previously customary devices for determining the mold bath level are no longer necessary.
  • the pouring speed is independent of the ferrostatic height or the bath level in the intermediate container. It is only determined by the easily adjustable pull-out speed. This also avoids harmful bath level fluctuations and, if necessary, the usual control elements, such as. B. plugs or sliders, which would otherwise be necessary to achieve a constant casting speed, are omitted in or on the mold upstream casting vessel.
  • the flow rate of the metal in the pouring tube is kept lower than the possible rate of ascent of the gas bubbles.
  • the flow rate of the metal in the pouring tube is set by the selected pull-out speed for a given flow cross section of the pouring tube.
  • the relatively low inflow speed of the unthrottled metal in the pouring tube has the advantage that washout of the pouring tube with the associated risk of tearing it off and disruptions caused by smearing of the flow channel in the pouring tube due to deposits are avoided. This increases the safety of the casting process and leads to an improvement in the quality of the cast product.
  • a further improvement of the cast product results from the fact that with this closed casting system, no slag enters the primary solidification area of the strand inside the mold, since reoxidation due to the inert atmosphere is not possible.
  • the cleaning effect achieved by the rising gas also has a favorable effect on the casting quality.
  • Lubrication can be done in a known manner with oil. However, due to the lack of oxygen, the amount of oil can be reduced considerably.
  • the flow speed in the pouring tube less than 0.6 m / sec in order to ensure that the gas bubbles rise safely against the incoming metal in the pouring tube.
  • the inert gas for example argon or nitrogen, is supplied in an amount of up to 0.5 l / sec.
  • the flow cross-section of the pouring tube should not be completely filled with metal, i.e. H. the amount of metal flowing into the pouring tube should be less than the swallowing capacity of the pouring tube. This enables the gas expanding in the cavity to escape upwards.
  • the device according to the invention is characterized in that a metering device which emits a constant amount of gas is provided in the gas supply line, by means of which the gas pressure in the cavity is independent of the level of the bath level of the melt in the casting vessel equal to the static pressure of the metal column between the bath seals in the casting vessel and in the mold is adjustable.
  • the lower end of the pouring tube should be arranged at a distance of 2 ⁇ 15cm from the upper edge of the mold for safety reasons, especially when casting smaller billet sizes.
  • the lower end of the pour tube should be chamfered.
  • the cross section of the opening is smaller than the flow cross section of the pouring tube.
  • F i g. 1 shows the device according to the invention, partly in section, with associated gas metering device and
  • F i g. 1 is between an oscillating mold 1 and a stationary casting vessel 2, for. B. an intermediate container, a movable shell 3 is provided, which can compensate for the oscillating movements of the mold.
  • This shell shown in the example shown as a flexible metal bellows, bounds a cavity 5 together with a pouring tube 4 attached under the pouring vessel 2.
  • liquid metal for example steel
  • argon is fed as an inert gas from a gas container 7 to the cavity 5 via lines 8.
  • an intermediate wall 11 is provided in the intermediate container, which has a passage opening 13, the cross section of which is smaller than the flow cross section 14 of the pouring tube 4. Therefore, the gas in the cavity 5, which expands due to the heating, can escape upward unhindered.
  • the intermediate wall 11 is so high that after the casting process at the desired bath level 15 in the intermediate container, the steel flows over it.
  • a pressure relief valve 12 is installed in the gas feed line for safety, which opens automatically at a pressure which corresponds to approximately twice the possible ferrostatic pressure. Due to the inert gas continuously introduced into the cavity 5, the bath level 6 adjusts itself exactly to the height of the lower end of the pouring tube 4. This is about 10 cm from the upper mold edge 17.
  • the strand 9 formed with a solidified shell is driven by rollers, e.g. B. an undrawn propelling and / or straightening unit conveyed out of the mold 1.
  • the gas introduced at a pressure higher than that of the ferrostatic column rises in the form of bubbles 16 in countercurrent through the steel flowing downwards in the pouring tube and emerges through the bath level 15 in the intermediate vessel 2 into the free atmosphere.
  • the flow rate of the steel in the pouring tube is kept lower than the possible rate of ascent of the gas bubbles.
  • the beveling of the gas bubbles is facilitated by a bevel 18 of the lower end of the pouring tube 4.
  • a uniform removal of the gas bubbles from the lower region of the pouring tube 4 is achieved in that the liquid steel is advantageously moved rotationally symmetrically about the longitudinal axis 25 of the strand.
  • induction coils 26 are arranged around the mold cavity wall of the mold 1, with which a continuous or, if desired, intermittent movement of the liquid steel core can be caused.
  • the steel is supplied without throttling, and consequently the flow speed of the steel in the pouring tube can be easily adjusted by the selected pull-out speed for a given flow cross section of the pouring tube.
  • the product can also be derived from the continuity equation according to which the product of the casting speed V (cm / min) times the mold cross section Q k (cm 2 ) must be the same Flow velocity Vg (cm / min) in the pouring tube times the flow cross-section Qg (cm 2 ) of the pouring tube, the required flow cross-section for preselected pouring speeds and mold formats can be calculated.
  • the diameter of the flow channel of the pouring tube is 55 m.
  • the amount of gas supplied is 0.005 i / sec at the start of casting and is reduced to an amount of 0.002 1 / sec after about 3 minutes.
  • a metering device 10 is provided in the gas feed line 8, which always delivers the same amount of gas at a certain setting, regardless of the upstream and opposite pressure.
  • the pressure of the gas in the cavity 5 is not regulated, as in the known methods, but only the amount of the continuously supplied inert gas is kept constant. Since the inert gas can escape upwards, a pressure is automatically set in the cavity 5 which is the same as the pressure which corresponds to the ferrostatic height from the lower end of the pouring tube 4 to the bath level 15 in the intermediate container 2.
  • the mold bath level adjusts itself precisely to the height of the lower end of the immersing pouring tube and remains there during the entire pouring process.
  • the effective operation of the system can be checked by observing the gas bases emerging through the bath level in the intermediate tank.
  • the above-mentioned bath level display for the intermediate tank is not necessary. Furthermore, there are no devices for regulating the flow rate of the steel into the mold.
  • the casting speed which is determined exclusively by the speed of the driving and / or straightening rollers is only limited by the requirement that the flow rate of the steel in the pouring tube must be lower than the rate of ascent of the gas bubbles.
  • the casting speed is more than 1.5 m / min over a large range of the casting time.
  • the line spacings 24 are approximately three times smaller than in conventional multi-line systems. Further advantages result, for example, from the design of the intermediate container, which can be built much shorter. In addition to the simpler design solution, this also brings metallurgical advantages. For example, the steel can be shed with a low casting temperature. Also because of the shorter distances between the point of impact of the pouring jet and the intermediate container spouts, the risk of closing is lower.

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

Claims (12)

1. Procédé pour la coulée continue de métal dans des installations à une ou plusieurs lignes, selon lequel on coule le métal, en particulier de l'acier, d'un récipient de coulée (2) à travers un tube de coulée (4) dans au moins une lingotière oscillante (1) qui présente, au-dessus de la surface (6) du bain de métal liquide qu'elle contient, un espace clos (5) rempli de gaz sous pression, dans lequel, pendant la coulée, on introduit du gaz inerte qui s'échappe ensuite à l'atmosphère en montant sous forme de bulles à travers et à contre-courant avec le métal s'écoulant dans le tube de coulée, caractérisé en ce que, au moyen d'un courant de gaz d'alimentation constant, on maintient la pression de gaz dans ledit espace automatiquement à une valeur égale à la pression statique de la colonne de métal qui surmonte la surface du bain dans la lingotière, quelle que soit la hauteur de cette colonne.
2. Procédé selon la revendication 1 pour la coulée continue d'acier, caractérisé en ce que l'on maintient la vitesse d'écoulement de l'acier dans le tube de coulée inférieure à 0,6 m/s.
3. Procédé selon la revendication 2, caractérisé en ce que l'on introduit le gaz inerte dans ledit espace sous un débit qui peut atteindre 0,5 I/s.
4. Procédé selon la revendication 1, caractérisé en ce que l'on utilise de l'argon comme gaz inerte.
5. Procédé selon la revendication 1, caractérisé en ce que, pendant le remplissage de la lingotière, au début de la coulée, on fait en sorte que le tube de coulée ne soit pas rempli sur toute sa section d'écoulement avec du métal.
6. Procédé selon la revendication 1, caractérisé en ce que, par l'action d'un champ électromagnétique, on confère un mouvement au métal liquide se trouvant dans la région de la surface du bain dans la lingotière.
7. Procédé selon la revendication 6, caractérisé en ce que l'on confère au métal un mouvement à symétrie de révolution autour de l'axe longitudinal de la barre coulée.
8. Dispositif pour la mise en oeuvre du procédé selon la revendication 1, comprenant un récipient de coulée 2, au moins une lingotière oscillante (1) et un tube de coulée (4) s'étendant jusque dans celle-ci, un espace (5) rempli de gaz, entouré d'une enveloppe mobile et dans lequel débouche une conduite d'alimentation en gaz (8), étant prévu entre la lingotière et le récipient de coulée et la section d'écoulement Qg (14) du tube de coulée (4) étant supérieure à
Figure imgb0003
où Qg est la section d'écoulement du tube de coulée, Qk la section de la lingotière, V la vitesse de coulée et Vg la vitesse d'écoulement du métal dans le tube de coulée, caractérisé en ce que la conduite d'alimentation en gaz (8) contient un appareil de dosage (10) qui délivre un débit de gaz constant et au moyen duquel la pression de gaz dans l'espace (5) peut être ajustée, à une valeur égale à la pression de la colonne de métal entre les bains dans le récipient de coulée (2) et la lingotière (1), quel que soit le niveau (15) du bain dans le récipient de coulée (2).
9. Dispositif selon la revendication 8, caractérisé en ce que l'extrémité inférieure du tube de coulée (4) est disposée à une distance de 2 à 15 cm du bord supérieur (17) de la lingotière.
10.Dispositif selon la revendication 8, caractérisé en ce que l'extrémité inférieure du tube de coulée (4) est biseautée.
11. Dispositif selon la revendication 8, caractérisé en ce que le récipient de coulée (2) est disposé stationnaire et contient une cloison (11) qui présente un orifice de passage (13) dont la section est plus petite que la section d'écoulement (14) du tube de coulée (4).
12. Dispositif selon la revendication 8, caracte- risé en ce qu'une soupape de surpression (12) est prévue dans la conduite d'alimentation en gaz (8).
EP79101640A 1978-06-01 1979-05-29 Procédé et dispositif pour la coulée continue des métaux selon une ou plusieurs lignes de coulée Expired EP0005820B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79101640T ATE1934T1 (de) 1978-06-01 1979-05-29 Verfahren und vorrichtung zum stranggiessen von metall in ein- oder mehrstranganlagen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH5997/78 1978-06-01
CH599778A CH628543A5 (de) 1978-06-01 1978-06-01 Verfahren und vorrichtung zum stranggiessen von metall in ein- oder mehrstranganlagen.

Publications (2)

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EP0005820A1 EP0005820A1 (fr) 1979-12-12
EP0005820B1 true EP0005820B1 (fr) 1982-12-08

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EP (1) EP0005820B1 (fr)
JP (1) JPS54158334A (fr)
AT (1) ATE1934T1 (fr)
CH (1) CH628543A5 (fr)
DE (1) DE2964197D1 (fr)
ES (1) ES481461A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0352356A1 (fr) * 1988-05-27 1990-01-31 Kinglor - Ltd Procédé et équipement relatif pour la mise en ouvre la coulée continue d'acier en absence complète d'agents oxydants
EP0943380A1 (fr) * 1998-03-19 1999-09-22 Kvaerner Metals Clecim Installation de coulée en continu d'un produit métallique et procédés de mise en oeuvre d'une telle installation

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5921450A (ja) * 1982-03-19 1984-02-03 Mitsubishi Heavy Ind Ltd 高品位鋼の連続鋳造方法
JPS5930453A (ja) * 1982-08-03 1984-02-18 カナデイアン・パテンツ・アンド・デベロツプメント・リミテツド 溶融アルミニウム含有鋼及び合金の連続鋳造方法及び装置
JPS5968644U (ja) * 1982-10-25 1984-05-09 新日本製鐵株式会社 連続鋳造における溶融金属の注入制御装置
DE3403892C2 (de) * 1984-02-04 1986-08-14 Mannesmann AG, 4000 Düsseldorf Vorrichtung für die Einleitung von Metallschmelze, insbesondere von Stahlschmelze, in eine Stranggießkokille
ZA85911B (en) * 1984-02-24 1985-09-25 Liquid Air Canada Molten metal casting
DE3917403C2 (de) * 1989-05-29 1998-02-05 Zimmermann & Jansen Gmbh Verfahren und Vorrichtung zum Füllen einer Stranggießkokille mit metallischer Schmelze
CN112276028B (zh) * 2020-09-28 2021-12-03 广东伟业铝厂集团有限公司 一种铝合金的高速铸棒设备

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2022841A1 (en) * 1968-11-08 1970-08-07 Vaw Ver Aluminium Werke Ag Molten metal dosing device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1921808A1 (de) * 1969-04-29 1970-11-12 Schloemann Ag Verfahren und Vorrichtung zur Regelung des Zuflusses der Metallschmelze zu Stranggiesskokillen
SU346908A1 (ru) * 1971-07-12 1977-12-05 Niskovskikh V M Способ непрерывной разливки металлов
FR2211305B1 (fr) * 1972-12-21 1975-06-06 Cem Comp Electro Mec
DE2609065A1 (de) * 1976-03-05 1977-09-15 Arbed Verfahren zur qualitativen verbesserung von stranggussmaterial aus beruhigten stahlqualitaeten

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2022841A1 (en) * 1968-11-08 1970-08-07 Vaw Ver Aluminium Werke Ag Molten metal dosing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0352356A1 (fr) * 1988-05-27 1990-01-31 Kinglor - Ltd Procédé et équipement relatif pour la mise en ouvre la coulée continue d'acier en absence complète d'agents oxydants
EP0943380A1 (fr) * 1998-03-19 1999-09-22 Kvaerner Metals Clecim Installation de coulée en continu d'un produit métallique et procédés de mise en oeuvre d'une telle installation

Also Published As

Publication number Publication date
DE2964197D1 (en) 1983-01-13
CH628543A5 (de) 1982-03-15
JPS54158334A (en) 1979-12-14
ATE1934T1 (de) 1982-12-15
EP0005820A1 (fr) 1979-12-12
ES481461A1 (es) 1980-07-01

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