EP1432539A2 - Procede et dispositif de refoidissement des plaques de cuivre d'une coquille pour la coulee continue de metaux liquides, en particulier d'acier liquide - Google Patents

Procede et dispositif de refoidissement des plaques de cuivre d'une coquille pour la coulee continue de metaux liquides, en particulier d'acier liquide

Info

Publication number
EP1432539A2
EP1432539A2 EP02777034A EP02777034A EP1432539A2 EP 1432539 A2 EP1432539 A2 EP 1432539A2 EP 02777034 A EP02777034 A EP 02777034A EP 02777034 A EP02777034 A EP 02777034A EP 1432539 A2 EP1432539 A2 EP 1432539A2
Authority
EP
European Patent Office
Prior art keywords
mold
casting
copper plate
coolant
temperature
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.)
Granted
Application number
EP02777034A
Other languages
German (de)
English (en)
Other versions
EP1432539B1 (fr
Inventor
Fritz-Peter Pleschiutschnigg
Stephan Feldhaus
Wolfgang Mossner
Werner Rahmfeld
Lothar Parschat
Erwin Wosch
Uwe Kopfstedt
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
Original Assignee
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
Priority claimed from DE10160739A external-priority patent/DE10160739C2/de
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1432539A2 publication Critical patent/EP1432539A2/fr
Application granted granted Critical
Publication of EP1432539B1 publication Critical patent/EP1432539B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/055—Cooling the moulds

Definitions

  • the invention relates to a method and a device for cooling the copper plates of a continuous casting mold for liquid metals, in particular for liquid steel, with mold coolant guided in cooling channels and during the speed start-up ramp to the target casting speed or exceeding the target casting speed of different copper plates -Target skin temperature.
  • Such continuous casting molds for casting liquid steel are cooled in known methods generally used, in that the mold coolant is kept constant in quantity and temperature regardless of the casting speed when it is fed into the continuous casting mold.
  • the consequence of this procedure is that with increasing casting speed, the thermal load, measured in W / m 2 , and thus also the copper plate skin temperature, and especially when casting at casting speeds of over 4 m / min, rises sharply.
  • This rise in temperature for a given copper plate thickness of, for example, 20 mm between the mold coolant and the hot side leads between when using powdered casting slag Strand shell and mold copper plate on the one hand to different
  • the disturbances occur both with a water flow in the continuous casting mold from bottom to top and from top to bottom.
  • the copper plate skin temperature is lower in the water flow from top to bottom than in the water flow from bottom to top.
  • the invention is based on the object of influencing the copper plate skin temperature, even when the casting speed is changed, in particular at a higher rate, in such a way that surface defects in the strand shell and / or cracks in the copper plate surface do not occur or occur to a significantly reduced extent.
  • the object is achieved according to the invention in that, with a changing casting speed between 1 m / min and a maximum of 12 m / min, the copper plate skin temperature by a quantitative correction of the mold coolant quantity and / or the mold coolant inlet temperature depending on the current casting speed and depending on the copper plate thickness is set to a desired, constant size.
  • the copper plate skin temperature can be favorably selected and kept constant depending on the casting speed even with different copper plate thicknesses.
  • there are constant conditions for the lubrication behavior of casting powder slag which is melted on the casting level from the casting powder used (if casting powder is used).
  • Farther advantages can be achieved with permanent mold copper plates that are no longer used until the copper recrystallizes and therefore become less cracked. Further advantages include improved strand surface quality and casting reliability regardless of the casting speed and the copper plate thickness for selected work windows. This also increases the output.
  • this also makes it possible for the desired, constant copper plate skin temperature to be set constantly in the area of the mold level.
  • the continuous casting mold is oscillated.
  • the method is further designed in such a way that process data and plant data, which are processed in control variables to form an online simulation model, are used to regulate the mold coolant quantity and the mold coolant inlet temperature.
  • the accuracy of the method can be increased even further by using an immediate determination of the copper plate skin temperature in the area of the mold level in addition or as an alternative to the online simulation model.
  • a device for cooling the copper plates of a continuous casting mold, in particular for liquid steel, with cooling channels through which the coolant flows solves the task of selecting the copper plate skin temperature, taking into account the current casting speed, even with copper plates of different thicknesses, and keeping it constant, according to the invention, that at casting speeds of between 1 m / min and a maximum of 12 m / min and copper plate thicknesses of 4 mm to approx. 50 mm, control variables are provided for checking the mold coolant inlet temperature and / or the mold coolant quantity.
  • the copper plate skin temperature on the hot side can be kept much lower than before, and the copper plate is protected in such a way that the recrystallization temperature of the copper is far from being reached. This advantage affects large areas of the casting speed.
  • the mold coolant inlet can be arranged at a distance above the casting level.
  • the continuous casting mold can be oscillated by means of an oscillation device.
  • the amount and the temperature of the mold cooling water is further controlled by a process computer that is supplied with process data and system data for an online simulation model for controlled variables for regulating the mold coolant inlet temperature and / or the mold coolant quantity. controls a three-way valve and a control valve as well as a speed-controlled pump in the mold coolant circuit.
  • this regulation can also be carried out in such a way that, in addition to or instead of the process computer, a device for determining the copper plate skin temperature in the area of the mold level can be used to regulate the mold coolant inlet temperature and / or the mold coolant quantity.
  • a device for determining the copper plate skin temperature in the area of the mold level can be used to regulate the mold coolant inlet temperature and / or the mold coolant quantity.
  • 1A is a block diagram of the cooling circuit of a classic mold
  • 2A is a casting speed profile with heat flow over time
  • Fig. 2D the desired heat profile with regulated copper plate skin temperature
  • Fig. 3 shows a comparison of the prior art with the invention based on the temperature curves over the casting speed, taking into account the coolant flow from top to bottom and from bottom to top in the continuous casting mold.
  • a continuous casting mold 1 into which liquid steel is poured, is cooled in such a way that the mold coolant 2 at the mold coolant inlet 3 into the continuous casting mold 1 in its mold coolant quantity 4 and its mold coolant.
  • Inlet temperature 5 is kept constant regardless of the casting speed 6.
  • This procedure means that as the casting speed 6 increases, the heat load 7 in W / m 2 (see FIG. 2A) and thus also the copper plate ten skin temperature 8 rises and rises sharply, especially when casting, with increasing casting speed 6 of up to 12 m / min.
  • the temperature rise for a given copper plate thickness 9, for example of 20 mm, between the coolant and the hot side leads, in the presence of casting powder slag 10 between the strand shell of the casting strand 11 and the mold copper plate 1.1, on the one hand to different lubricating behavior and heat load 7 and on the other hand to shortened service life of the mold copper plates 1.1 , which is due to the exceeding of the recrystallization temperature 12 of cold-rolled copper (cf. FIG. 3).
  • the disturbances occur both with a water course 13.1 of the mold water 13 in the continuous casting mold 1 from bottom to top and with a water course 13.2 from top to bottom (see FIG. 3).
  • the copper plate skin temperature 8 is set lower in the water course 13.2 from top to bottom than in the water course 13.1 from bottom to top.
  • the continuous casting mold 1 is cooled by an inner coolant circuit 19 and an outer coolant circuit 20.
  • the inner coolant circuit 19 is guided over the heat exchanger 21 in such a way that the amount of permanent mold coolant 4, which is set constant by a pump 22, is also kept constant in its inlet temperature 23 (TJ ⁇ ) regardless of the casting speed 6.
  • a three-way valve 24, a bypass 25 and a control path 26 between a Ti n measuring device for the inlet temperature 23 (T in ) and the three-way valve 24 are used for this purpose.
  • the mold coolant 2 is used as a watercourse
  • the coolant circuit as shown in FIG. 1A is shown in the block diagram, but with increasing casting speed 6 from 1 m / min to a maximum of 12 m / min, the copper plate skin temperature 8 by a quantitative correction of the mold coolant quantity 4 and / or Chill coolant inlet temperature 5 regardless of the casting speed 6 and regardless of the copper plate thickness 9 with a constantly controlled mold coolant inlet temperature 5 is set to a desired, constant copper plate skin temperature 8.
  • the regulation of the mold coolant quantity 4 and the mold coolant inlet temperature 5 can be implemented via a process computer 27 for an online simulation model 27.4 and process data 27.1 of the continuous casting mold 1 with a constant copper plate skin temperature 8 via an inlet speed window 6.2 (see FIG. 3) become.
  • the process computer 27 requires process data 27.1 and system data 27.2 in order to control the mold coolant quantity 4 via a pump station 22.1 and / or control valves 29 and the mold coolant inlet temperature 5 through the three-way valve 24 via control variables 27.3.
  • a pressure expansion tank 30 is located in front of the pump station 22.1.
  • 2A shows a heat flow 17 and a profile 16 of the casting speed 6 over the casting time 18.
  • the graph describes a casting process from the start via a constant inlet speed window 6.2 with subsequent acceleration to a high speed level.
  • 2B shows the prior art.
  • the real copper plate skin temperature 8, designated T cu-re a i increases with the casting speed 6 and deviates from the desired copper plate skin temperature 8, referred to as the copper plate target temperature 8.1, (Tc u -ziei) because the mold
  • the amount of coolant 4 and the mold coolant inlet temperature 5 for cooling the continuous casting mold 1 is kept constant.
  • the real copper plate skin temperature 8 (Tcu-r ea i) by a corresponding quantitative correction of the mold coolant quantity 4 is independent of the casting speed 6 at constant mold coolant inlet temperature 5 with the desired copper plate skin temperature 8, the Copper plate target temperature 8.1 (Tcu-ziei) matched.
  • the copper plate skin temperature 8 (T Cu -re a i) with the copper plate target temperature 8.1 (Tcu-ziei) by the corresponding quantitative setting of the mold coolant quantity 4 and the mold coolant inlet temperature 5 as a function of the profile 16 of the casting speed over the casting time 18 to cover.
  • both influencing variables such as the mold coolant quantity 4 or the coolant speed, which increases the heat transfer, and the mold coolant inlet temperature 5, which increases the potential and thus the heat flow 17
  • the inlet speed windows 6.2 with respect to the casting speed 6 are for one wanted
  • real copper plate skin temperature 8 for a given copper plate thickness 9 is greater than in the case of variation of only one of the two influencing variables.
  • the difference between the known method and the inventive method can be clearly read. It is the mold plate skin temperature 8 depending on the increasing casting speed 6, the max. Is 12 m / min.
  • a horizontal straight line of the recrystallization temperature 12 represents the end of the thermal load on the copper plate made of cold-rolled copper, at which the copper stability and / or its cold rolling structure and thus loses its properties that are important for the casting of liquid steel.
  • the temperature profile 14 in the prior art is described with curve 14.1 (water profile from bottom to top) and curve 14.2 (water profile from top to bottom).
  • the strongly increasing behavior of the copper plate skin temperature 8 in the mold level with increasing casting speed 6 and increasing copper plate thickness 9 can be attributed to the constant amount of mold coolant 4 and the constant mold coolant inlet temperature 5 at the mold coolant inlet 3 during casting.
  • the principle of the invention can also be applied to strip casting devices which are operated at a casting speed of up to 100 m / min. All measures applied to the height of the continuous casting mold 1 are applied to the scope of the twin rollers. LIST OF REFERENCE NUMBERS

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

L'invention concerne un procédé et un dispositif permettant de refroidir des plaques de cuivre (1.1) d'une coquille pour la coulée continue (1) de métaux liquides, en particulier d'acier liquide au moyen d'un agent de refroidissement de coquille (2) guidé dans des canaux de refroidissement. L'objectif de l'invention est d'influer sur la température superficielle des plaques de cuivre lors de l'élévation de température initiale pour atteindre la vitesse de coulée théorique ou lorsque la vitesse de coulée théorique est dépassée pour la température superficielle divergente des plaques de cuivre, même lorsque la vitesse de coulée est changeante, en particulier plus élevée, de façon à supprimer ou réduire significativement l'apparition de défauts superficiels dans l'enveloppe de coulée et/ou de fissures dans la surface des plaques de cuivre. A cet effet, la température superficielle des plaques de cuivre (8) est régulée à des vitesses de coulée changeantes (6) strictement comprises entre 1m/min et 12 m/min, par correction quantitative de la quantité d'agent de refroidissement de coquille (4) et/ou de la température d'entrée (5) de cet agent de refroidissement, en fonction de la vitesse de coulée (6) ainsi que de l'épaisseur des plaques de cuivre (9), pour obtenir une valeur constante souhaitée.
EP02777034A 2001-09-28 2002-09-07 Procede et dispositif de refoidissement des plaques de cuivre d'une coquille pour la coulee continue de metaux liquides, en particulier d'acier liquide Expired - Lifetime EP1432539B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10148135 2001-09-28
DE10148135 2001-09-28
DE10160739A DE10160739C2 (de) 2001-09-28 2001-12-11 Verfahren und Einrichtung zum Kühlen der Kupferplatten einer Stranggießkokille für flüssige Metalle, insbesondere für flüssigen Stahl
DE10160739 2001-12-11
PCT/EP2002/010030 WO2003028921A2 (fr) 2001-09-28 2002-09-07 Procede et dispositif de refoidissement des plaques de cuivre d'une coquille pour la coulee continue de metaux liquides, en particulier d'acier liquide

Publications (2)

Publication Number Publication Date
EP1432539A2 true EP1432539A2 (fr) 2004-06-30
EP1432539B1 EP1432539B1 (fr) 2006-05-03

Family

ID=26010255

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02777034A Expired - Lifetime EP1432539B1 (fr) 2001-09-28 2002-09-07 Procede et dispositif de refoidissement des plaques de cuivre d'une coquille pour la coulee continue de metaux liquides, en particulier d'acier liquide

Country Status (13)

Country Link
US (1) US20040256078A1 (fr)
EP (1) EP1432539B1 (fr)
JP (1) JP2005503927A (fr)
CN (1) CN1561273A (fr)
AT (1) ATE324953T1 (fr)
BR (1) BR0212935A (fr)
CA (1) CA2460897A1 (fr)
DE (1) DE50206693D1 (fr)
HU (1) HUP0402138A2 (fr)
MX (1) MXPA04002744A (fr)
PL (1) PL367404A1 (fr)
RU (1) RU2004113105A (fr)
WO (1) WO2003028921A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1292858C (zh) * 2004-01-17 2007-01-03 宝山钢铁股份有限公司 一种水冷的金属连铸结晶器
DE102009023677A1 (de) * 2009-06-03 2010-12-09 Egon Evertz Kg (Gmbh & Co.) Verfahren zur Regelung der Flüssigkeitskühlung von Stranggießkokillen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58151952A (ja) * 1982-03-02 1983-09-09 Kobe Steel Ltd 電磁撹「はん」用鋳型の冷却方法
JPS63104754A (ja) * 1986-10-20 1988-05-10 Mitsubishi Heavy Ind Ltd スプレ冷却モ−ルドの水量調節方法
DE4127333C2 (de) * 1991-08-19 2000-02-24 Schloemann Siemag Ag Stahlstranggießkokille
DE19956577A1 (de) * 1999-11-25 2001-05-31 Sms Demag Ag Verfahren zum Stranggießen von Brammen, insbesondere von Dünnbrammen, sowie eine Vorrichtung zu dessen Durchführung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03028921A2 *

Also Published As

Publication number Publication date
JP2005503927A (ja) 2005-02-10
WO2003028921A3 (fr) 2003-10-23
CN1561273A (zh) 2005-01-05
PL367404A1 (en) 2005-02-21
BR0212935A (pt) 2004-10-13
CA2460897A1 (fr) 2003-04-10
DE50206693D1 (de) 2006-06-08
RU2004113105A (ru) 2005-05-20
HUP0402138A2 (hu) 2005-02-28
US20040256078A1 (en) 2004-12-23
WO2003028921A2 (fr) 2003-04-10
ATE324953T1 (de) 2006-06-15
MXPA04002744A (es) 2004-07-29
EP1432539B1 (fr) 2006-05-03

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