EP1066898B1 - Procédé d'alimentation de métal liquide d'une machine de coulée continue - Google Patents

Procédé d'alimentation de métal liquide d'une machine de coulée continue Download PDF

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Publication number
EP1066898B1
EP1066898B1 EP00114274A EP00114274A EP1066898B1 EP 1066898 B1 EP1066898 B1 EP 1066898B1 EP 00114274 A EP00114274 A EP 00114274A EP 00114274 A EP00114274 A EP 00114274A EP 1066898 B1 EP1066898 B1 EP 1066898B1
Authority
EP
European Patent Office
Prior art keywords
distributor
melt
casting
temperature
liq
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
EP00114274A
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German (de)
English (en)
Other versions
EP1066898A1 (fr
Inventor
Fritz-Peter Prof. Dr. Pleschiutschnigg
Stephan Dr. Feldhaus
Lothar Parschat
Michael Dr. Vonderbank
Erwin Dr. Wosch
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 Siemag AG
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SMS Demag AG
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 SMS Demag AG filed Critical SMS Demag AG
Publication of EP1066898A1 publication Critical patent/EP1066898A1/fr
Application granted granted Critical
Publication of EP1066898B1 publication Critical patent/EP1066898B1/fr
Anticipated expiration legal-status Critical
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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
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • 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

Definitions

  • the invention relates to a method for carrying out the melt in a continuous casting machine, wherein the melt of a specific alloy having a liquidus temperature T liq is poured into a casting mold via a distributor and the strand solidified within the casting mold is drawn off.
  • the object of the present invention is to provide a method for To provide melt guide in a continuous casting machine, with which a accurate temperature and casting speed control for a reliable and in particular automatable casting is possible.
  • the method proposes that the actual temperature of the melt is detected in the distributor at an actual casting speed, wherein the detection of the temperature discontinuously or continuously by means of suitable known temperature receiving means, such as thermocouples or temperature sensors occurs.
  • suitable known temperature receiving means such as thermocouples or temperature sensors.
  • the actual heat loss of the melt in the distributor and during its residence time between distributor and pouring mirror in the casting mold, for example an oscillating mold, is determined by taking factors responsible for the heat loss. Knowing the liquidus temperature T liq of the melt to be cast and the current heat loss, an equivalent liquidus temperature T * liq (+ 0 ° C) is determined as the melt temperature limit in the distributor at which continuous casting defects occur in the mold.
  • the temperature in the mold steel temperature must therefore be chosen so that no pre-solidification takes place in the mold and the casting powder is sufficiently melted to ensure good lubrication and insulation of the strand in his journey through the mold.
  • the isotherms are determined for this purpose, ie the equivalent liquidus temperature profiles T * liq + x (° C) as a function of the superheat temperature x (° C) with x> 0, in each case depending on the casting speed ,
  • T * liq + x (° C) as a function of the superheat temperature x (° C) with x> 0, in each case depending on the casting speed .
  • the temperature of the melt in the distributor as a measure of prediction the temperature conditions used in the mold.
  • the current temperature conditions in the mold can be predicted or indirectly within an "incubation period" and for recruitment an optimal casting speed or a casting speed range be used.
  • the casting speed is therefore not directly dependent from the temperature of the melt in the mold, but indirectly above the distributor temperature is set.
  • the method offers the possibility of indicating, for example, excessive cooling of the melt in the mold level of the mold, which is indicated by the determination of the equivalent T * liq temperature in the manifold, which is based on the melt temperature measurement in the manifold to respond by a corresponding G man Oberöhung to avoid a casting disturbance in the mold in the form of surface defects on the cast product or a breakthrough.
  • T * liq temperature in the manifold which is based on the melt temperature measurement in the manifold to respond by a corresponding Gelloserhöhung to avoid a casting disturbance in the mold in the form of surface defects on the cast product or a breakthrough.
  • the solidification process in the mold at a optimal casting speed and at the same time a trouble-free production and ensure good surface quality.
  • the invention makes it clear that with the detection of the melt temperature in the distributor by discontinuous and / or continuous measurement and by the qualitative "online" detection of the heat losses of the melt in the manifold and between distributor and mold optimal, breakthrough-proof and possibly fully automatic melt management alone on the data of the melt temperature in the distributor and the equivalent T * liq temperature of the melt in the distributor, T * liq . + 0 ° C and its isotherms +5 to + 20 ° C, preferably in a step interval of 5 ° C, respectively, or the temperature curves over the casting speed can be ensured to produce an isothermal window.
  • the casting speed is chosen so that the temperature of the melt in the distributor runs along or above the isotherms of the equivalent liquidus temperature profile T * liq + 5 ° C.
  • the temperature of the melt in the distributor should preferably run along or below the isotherms of the equivalent liquidus temperature profile T * liq + 20 ° C., particularly preferably below the isotherms of the equivalent liquidus temperature profile T * liq + 15 ° C.
  • the residence time of the melt in the distributor is dependent the casting capacity, which in turn is determined by the casting width, the solidification thickness, the casting speed, the current distributor level and the Ratio of distributor surface to its volume or distributor size, the drop in the melt weight in the distributor depending on its Surface / Votum ratio, the initial heating time of the distributor for adjusting the equilibrium temperature corresponding to the melt temperature as well as the insulation or the insulation state of the distributor and thus the Heat radiation of the distributor.
  • the inventively proposed system is used in a continuous casting machine with an oscillating stand or walking mold, also in Continuous casting machines with a casting mold designed as 2-roller molds (Twin Roller) or band mold are formed. Especially with the last two procedures allowed the proposed system at the necessary high casting speeds with decreasing solidification times at a smaller solidification thickness one optimal process control.
  • FIG. 1a schematically illustrates a part of the casting process sequence of a molten steel in a continuous casting machine
  • Figure 5 gives an overview of a complete continuous casting machine.
  • the melt is poured over a pan 1 in a manifold 2, from which it then flows through a submount (also SEN) 3 in the mold 4.
  • the embodiment of the casting method illustrated in FIG. 1 is a stand-alone mold oscillating in the vertical direction with respect to the solidifying strand shell 5a, b (see arrows in the mold side walls 6a, b), for example a thin-slab mold.
  • the outflow rate of the melt from the distributor is controlled by means of a vertically movable plug 7 with traversing device 7a or a slider 8.
  • the dip tube 3 dips into the mold 4.
  • 9 is the self-adjusting Gittyapt, with 10 the casting powder or forming casting slag characterized.
  • the casting speed v c is given by the mold dimensions resulting slab width at the exit from the mold.
  • the distributor 2 has a thermal radiation in thermal equilibrium with the melt, here indicated by 11, which can be indicated with a skin temperature of, for example, 100 ° C. and which thus leads to a heat loss of the steel during its residence time in the distributor.
  • the manifold 2 is further characterized by a maximum weight of the melt with a maximum fill height (h max) in proportion to the respective actual filling height h.
  • the heat losses of the melt in the dip tube (SEN) 3, here indicated by 13 and possibly the actual filling height h of the manifold is detected based on the heat loss of the steel in the distributor has an influence directly.
  • the inventive method or system is not limited to a continuous casting with an oscillating mold is, there are also casting processes after the strip casting process (Fig. 1a), in which the melt from a distributor 102 onto a cooled endless belt 104, which runs around two rollers 114, 115, poured and withdrawn, or
  • the 2-roll casting Fig. 1 b
  • the melt from a Distributor 202 between two counter-rotating rollers 214, 215 is poured and then subtracted, conceivable.
  • FIGS. 2 and 2a show the relationships between the melt temperature in the distributor or the Overheating of the melt in the distributor (or the heat loss of the melt in the distributor and between distributor and bath level of the mold) and the casting speed as well as the utilization of these connections for the mathematical prediction of the temperature of the melt in the bath level in the mold.
  • Fig. 2a shows a detail of Fig. 2 in the casting speed range from 3.5 to 6.0 m / min. Under distribution temperature is in each case the temperature of the Melt in the distributor to understand.
  • T * liq temperature of the melt in the distributor 15 or the equivalent T * liq temperature profile (T * liq + 0 ° C) shown in the diagram show at which temperature in the distributor the steel temperature in the distributor Mold will reach the liquidus temperature. If the liquidus temperature (here about 1500 ° C) is reached too early in the mold, the solidification takes place already in the mold level and not only in contact with the mold walls to form the desired strand shell, creating a bridging and thus a breakthrough by missing Slag lubrication or defective strand surfaces are connected.
  • the ratio of the temperature of the melt to the casting speed shown in FIGS. 2 and 2a can be influenced by various factors which shift the T / v c -Raster to higher or lower temperatures and thus bring about a dynamic.
  • the influence of various factors is shown in FIG.
  • the heat loss increases with the decrease of the distributor weight in function of the top surface / volume ratio of the distributor and the residence time (influence B), as shown schematically in Fig. 3b.
  • influence B the heat loss and thus the necessary overheating by the so-called "Liquid Core Reduction” increases, the strand is reduced with still liquid sump from Kokillenaustrittsdicke x to a smaller solidification thickness y (influence C).
  • the heat loss decreases with greater casting power due to an initially increasing heating process of the distributor 2 during the casting of the first melt, the temperature being adjusted to an equilibrium temperature after a certain time (see Fig. 2b).
  • the time t GG is about 20-30 minutes, until a temperature equilibrium between distributor and melt is set (influence A).
  • the heat loss decreases with increasing casting width, shown in Fig. 3a with the ratio D to D1) and with increasing solidification thickness (D2) and with improved insulation of the manifold of the Verteilausausmautation (influence E, Fig. 3a) or sinking outer distributor skin temperature and immersion nozzle.
  • the T / v c raster becomes dynamic and can be constantly updated during casting by means of 'online' recorded process data.
  • Fig. 4 in such a dynamic temperature casting system the casting property behavior of a melt with certain composition, wherein the respective casting speed is optimally adapted according to the method of the invention, here represented by 18. Furthermore, in FIG. 4, the frequency distribution (19) the temperatures of the melt in the distributor in the given diagram one here - Monthly production - of good and thus inconspicuous melts registered to to be able to statistically determine an optimization of the melt guide.
  • FIG. 5 shows an overview of a continuous casting machine with a pan 300 as well a pan 300 receiving fixture 301 and a manifold 302 with appropriate holding device 303.
  • the heat loss of the melt in Distributor is determined by means of suitable measuring devices 304 and the data via corresponding lines 305, 306 fed into a computer 307. It is also conceivable already the heat loss of the melt in the pan Measure by means of measuring devices 308 and via the line 309 in the computer feed. It is also conceivable, in a first approximation of a constant Steel temperature in the pan with a temperature drop of for example 0.1 ° C / min go out.
  • the more certain the more factors and the liquidus temperature of the alloy is the equivalent Uquidus temperature calculated and in the temperature / casting speed diagram represented by a monitor 310.
  • a target casting speed which is in the illustrated isothermal window, set, and via a line 312 of the slide or plug of the distributor as adjusting (315) controlled for the casting speed.
  • the inventive method and the system are used for thin slab casting.
  • a thin slab of, for example 50 mm solidification thickness requires a solidification time of about 1 min.
  • the processes in the Mold at casting speeds of up to now 8 m / min and in the near future 10 m / min make for a reliable temperature and temperature Speed guide necessary, which provided according to the invention becomes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Claims (9)

  1. Procédé d'alimentation de métal liquide d'une machine de coulée continue, dans lequel le métal liquide d'un alliage déterminé est coulé à une température de Liquidus Tliq par un répartiteur (2,102,202,203) dans une lingotière (4,104,214,215) et la coulée continue (314) solidifiée à l'intérieur de la lingotière est retirée,
    caractérisé par,
    l'enregistrement de la température effective du métal liquide dans le répartiteur à une vitesse de coulée effective,
    la détermination de la perte de chaleur effective du métal liquide dans le répartiteur et pendant son temps de séjour entre le répartiteur et le ménisque (9) dans la lingotière,
    la détermination d'une température de Liquidus équivalente T*liq+0 (15) faisant office de limite de température pour la température du métal liquide dans le répartiteur, dans lequel la température de Liquidus Tliq est atteinte à une vitesse de coulée donnée déjà au niveau du ménisque de la lingotière, ainsi que
    des isothermes de la température de Liquidus équivalente T*liq +x en fonction de températures de surchauffe x telles que x>0, les isothermes étant respectivement proportionnels aux températures de métal liquide dans le répartiteur et aux vitesses de coulée,
    l'adaptation de la vitesse de coulée continue effective à une vitesse de coulée continue de consigne comprise dans une fenêtre d'isothermes prédéfinie, dont la limite la plus basse est au dessus du cours de la température de Liquidus équivalente T*liq +0.
  2. Procédé selon la revendication 1,
    caractérisé en ce que,
    les isothermes de la température de Liquidus équivalente T*Liq +x sont déterminés par étapes à des intervalles de 5 °C.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que,
    la vitesse de coulée est choisie de telle sorte que la température du métal liquide dans le répartiteur s'étende le long ou au dessus des isothermes du cours de température de Liquidus équivalent T*Liq +5 °C.
  4. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que,
    la température de coulée est choisie de telle sorte que la température du métal liquide dans le répartiteur s'étende le long ou au dessus des isothermes du cours de température de Liquidus équivalent T*Liq +5 °C et la température du métal liquide dans le répartiteur s'étende le long ou en dessous des isothermes du cours de température de Liquidus équivalent T*liq+20 °C, de préférence +15 °C.
  5. Procédé selon une des revendications 1 à 4,
    caractérisé en ce que,
    dans la perte de température du métal liquide dans le répartiteur entrent:
    le temps de séjour du métal liquide dans le répartiteur et/ou
    la baisse du poids du métal liquide dans le répartiteur en fonction du rapport surfaces/volumes de ce dernier et/ou
    le temps de réchauffement initial du répartiteur pour régler la température et/ou l'isolation, respectivement l'état d'isolation du répartiteur, correspondant à la température du métal liquide.
  6. Procédé selon une des revendications 1 à 5,
    caractérisé en ce que,
    le rayonnement de chaleur d'une busette immergée du répartiteur, qui est plongée dans la lingotière comme un moule de coulée, entre dans la détermination de la perte de chaleur du métal liquide pendant son temps de séjour entre le répartiteur et le ménisque dans la lingotière.
  7. Procédé selon une des revendications 1 à 6,
    caractérisé en ce que,
    les cours de température de Liquidus équivalents T*Liq +0 ainsi que + T*Liq+x d'un métal liquide possédant une fenêtre d'isothermes prédéfinie sont représentés par rapport au temps de coulée d'un métal liquide dans un diagramme Température de répartiteur/ Vitesse de coulée et sont marqués visuellement.
  8. Procédé selon la revendication 7,
    caractérisé en ce que,
    parmi les facteurs du diagramme Température de répartiteur/ Vitesse de coulée, ceux qui influent sur la perte de chaleur sont inclus et représentés visuellement.
  9. Procédé selon une des revendications 1 à 8,
    caractérisé en ce que,
    la vitesse de coulée continue de consigne est réglée automatiquement à l'intérieur d'une fenêtre d'isothermes prédéfinie, dont la limite la plus basse s'étend au dessus du cours de température de Liquidus équivalent T*Liq +0.
EP00114274A 1999-07-06 2000-07-04 Procédé d'alimentation de métal liquide d'une machine de coulée continue Expired - Lifetime EP1066898B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19930909 1999-07-06
DE19930909 1999-07-06

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EP1066898B1 true EP1066898B1 (fr) 2005-03-09

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US (1) US6539273B1 (fr)
EP (1) EP1066898B1 (fr)
JP (1) JP2001038456A (fr)
KR (1) KR100720429B1 (fr)
CN (1) CN1258415C (fr)
AT (1) ATE290446T1 (fr)
DE (1) DE50009703D1 (fr)
ES (1) ES2238224T3 (fr)
TW (1) TW452515B (fr)

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DE10027324C2 (de) * 1999-06-07 2003-04-10 Sms Demag Ag Verfahren zum Gießen eines metallischen Strangs sowie System hierzu
FR2864844B1 (fr) * 2004-01-07 2015-01-16 Saint Gobain Dispositif d'eclairage autonettoyant
AT413950B (de) * 2004-05-26 2006-07-15 Voest Alpine Ind Anlagen Stranggiessanlage mit mindestens einem roboter und verfahren zum betrieb einer stranggiessanlage unter einbindung von mindestens einem roboter
KR101485663B1 (ko) 2013-04-16 2015-01-22 주식회사 포스코 연속주조 주편의 폭 제어방법
CN103464699B (zh) * 2013-08-13 2016-01-20 新疆八一钢铁股份有限公司 一种提高连铸机中间包热交换成功率的方法
CN104226951B (zh) * 2014-09-05 2016-02-24 河北钢铁股份有限公司邯郸分公司 一种连铸机停浇阶段提高合格定尺铸坯产量的方法
CN106141132A (zh) * 2015-03-31 2016-11-23 新日铁住金工程技术株式会社 铸坯的制造方法及连续铸造装置
CN105127390B (zh) * 2015-09-02 2017-08-29 中冶连铸技术工程有限责任公司 连铸用电磁搅拌控制方法及系统
CN107598146B (zh) * 2017-08-17 2019-04-30 中冶连铸技术工程有限责任公司 用浸入式水口流钢通道截面积预控塞棒头位置的方法
ES2949545T3 (es) 2018-02-28 2023-09-29 Heraeus Electro Nite Int Método y aparato para monitorizar un proceso de colada de acero continuo
CN110057864B (zh) * 2019-05-08 2020-02-07 北京科技大学 一种钢液在水口通道内加热过程的模拟装置和方法
CN111199119B (zh) * 2019-12-18 2022-06-17 中冶南方连铸技术工程有限责任公司 连铸异形坯坯头温度模拟方法

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Also Published As

Publication number Publication date
KR100720429B1 (ko) 2007-05-21
ES2238224T3 (es) 2005-09-01
KR20010015196A (ko) 2001-02-26
TW452515B (en) 2001-09-01
CN1258415C (zh) 2006-06-07
EP1066898A1 (fr) 2001-01-10
ATE290446T1 (de) 2005-03-15
US6539273B1 (en) 2003-03-25
CN1280041A (zh) 2001-01-17
JP2001038456A (ja) 2001-02-13
DE50009703D1 (de) 2005-04-14

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