US20040256078A1 - Method and device for cooling the copper plates of a continuous casting ingot mould for liquid metals, especially liquid steel - Google Patents

Method and device for cooling the copper plates of a continuous casting ingot mould for liquid metals, especially liquid steel Download PDF

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Publication number
US20040256078A1
US20040256078A1 US10/491,035 US49103504A US2004256078A1 US 20040256078 A1 US20040256078 A1 US 20040256078A1 US 49103504 A US49103504 A US 49103504A US 2004256078 A1 US2004256078 A1 US 2004256078A1
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US
United States
Prior art keywords
ingot mold
coolant
casting
copper plate
accordance
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.)
Abandoned
Application number
US10/491,035
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English (en)
Inventor
Fritz-Peter Pleschiutschnigg
Stephan Feldhaus
Wolfgang Mossner
Werner Rahmfeld
Lothar Parschat
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Individual
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Individual
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 Individual filed Critical Individual
Publication of US20040256078A1 publication Critical patent/US20040256078A1/en
Abandoned 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
    • B22D11/16—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 concerns a method and a device for cooling the copper plates of a continuous casting ingot mold for molten metals, especially molten steel, with an ingot mold coolant conveyed in cooling channels and with a copper plate nominal skin temperature that deviates during the ramping up to the set casting rate or when the set casting rate is exceeded.
  • DE 41 27 333 C2 describes a method for conveying the coolant at the maximum rate in the region of the highest thermal stress. This improves heat dissipation and lowers the temperature of the ingot mold plate. Another goal is the reduction of the temperature differences over the height of the ingot mold and the attendant stress reduction and prolongation of the service life of the ingot mold walls. However, this method does not take into account a changed, especially an increased, very high casting rate.
  • the objective of the invention is to influence the copper plate skin temperature in such a way that, even with a varied, especially a higher casting rate, surface defects in the strand shell and/or cracks in the surface of the copper plate do not occur or occur to a much lesser extent.
  • this objective is achieved by adjusting the copper plate skin temperature at varying casting rates between 1 m/min and a maximum of 12 m/min by means of a quantitative correction of the amount of ingot mold coolant and/or the intake temperature of the ingot mold coolant to a desired, constant value, depending on the present casting rate and depending on the thickness of the copper plates.
  • the copper plate skin temperature can be advantageously selected and held constant, depending on the casting rate, even at different copper plate thicknesses.
  • constant conditions are present for the lubricating behavior of the flux powder slag, which is melted on the liquid metal level from the flux powder that is used (if flux powder is used).
  • advantages can result from ingot mold copper plates that are no longer stressed to the point that recrystallization of the copper occurs and therefore do not become cracked. Additional advantages are an improved strand surface quality and casting reliability, independently of the casting rate and the thickness of the copper plate, for selected “working windows”. This also increases output.
  • the continuous casting ingot mold is oscillated.
  • the method is further designed in such a way that, to control the amount of ingot mold coolant and the intake temperature of the ingot mold coolant, process data and plant data are introduced, which are processed into controlled variables in an online simulation model.
  • the accuracy of the method can be further increased by using a direct determination of the copper plate skin temperature in the region of the liquid metal level in addition to or alternatively to the online simulation model.
  • a device for cooling the copper plates of a continuous casting ingot mold, especially for molten steel, with cooling channels through which ingot mold coolant flows achieves the objective of selecting the copper plate skin temperature and maintaining it at a constant value on the basis of the present casting rate, even at different copper plate thicknesses, by providing controlled variables for controlling the intake temperature of the ingot mold coolant and/or the amount of ingot mold coolant at casting rates between 1 m/min and a maximum of 12 m/min and at copper plate thicknesses of 4 mm to about 50 mm.
  • the copper plate skin temperature on the hot side can be maintained at a significantly lower level than before, even at the beginning of casting, and the copper plate can be protected in a way that prevents the temperature from coming even close to the recrystallization temperature of copper. This advantage is obtained over a large range of casting rates.
  • the ingot mold coolant intake can be located some distance above the liquid metal level.
  • the continuous casting ingot mold can be oscillated by an oscillation device.
  • the amount and temperature of the ingot mold cooling water are controlled in such a way that a process-control computer, which is supplied with process data and plant data for an online simulation model for controlled variables for controlling the intake temperature of the ingot mold coolant and/or the amount of ingot mold coolant, controls a three-way valve and a control valve as well as a speed-controlled pump in the ingot mold coolant circulation.
  • a process-control computer which is supplied with process data and plant data for an online simulation model for controlled variables for controlling the intake temperature of the ingot mold coolant and/or the amount of ingot mold coolant, controls a three-way valve and a control valve as well as a speed-controlled pump in the ingot mold coolant circulation.
  • this control can be carried out in such a way that, in addition to or instead of the process-control computer, a device for determining the copper plate skin temperature in the region of the liquid metal level can be used to control the intake temperature of the ingot mold coolant and/or the amount of ingot mold coolant.
  • FIG. 1A shows a functional block diagram of the coolant circulation of a conventional ingot mold.
  • FIG. 1B shows the corresponding functional block diagram of the coolant circulation of a so-called ISO ingot mold in accordance with the invention.
  • FIG. 2A shows a casting rate profile with heat flow as a function of time.
  • FIG. 2B shows the heat behavior as a function of time with conventional cooling
  • FIG. 2C shows the desired heat behavior as a function of time in accordance with the invention.
  • FIG. 2D shows the desired heat behavior as a function of time with adjusted copper plate skin temperature.
  • FIG. 3 shows a comparison of the state of the art with the invention on the basis of the temperature curves as a function of the casting rate, taking into consideration the flow of the coolant from top to bottom and from bottom to top in the continuous casting ingot mold.
  • a continuous casting ingot mold 1 into which molten steel is cast, is cooled in such a way that the ingot mold coolant 2 at the ingot mold coolant intake 3 into the continuous casting ingot mold 1 is maintained at constant values with respect to the amount 4 of ingot mold coolant and the intake temperature 5 of the ingot mold coolant, independently of the casting rate 6 .
  • This method of operation means that, with increasing casting rate 6 , the thermal load 7 in W/m 2 (see FIG. 2A) and thus the copper plate skin temperature 8 rise sharply, especially during casting at an increasing casting rate 6 of up to 12 m/min.
  • the temperature rise at a given copper plate thickness 9 e.g., 20 mm, between the coolant and the hot side leads, in the presence of flux powder slag 10 between the strand shell of the cast strand 11 and the ingot mold copper plate 1 . 1 , for one thing, to variable lubricating behavior and thermal load 7 and, for another, to reduced services lives of the ingot mold copper plates 1 . 1 , which is caused by the recrystallization temperature 12 of cold-rolled copper being exceeded (see FIG. 3).
  • the continuous casting ingot mold 1 is cooled by an internal coolant circulation 19 and an external coolant circulation 20 .
  • the external coolant circulation 20 which passes through a heat exchanger 21 , serves to cool the ingot mold coolant 2 in the internal coolant circulation 19 .
  • the internal coolant circulation 19 is conveyed through the heat exchanger 21 in such a way that the ingot mold coolant 2 , which is adjusted to a constant amount 4 by a pump 22 , is likewise held constant with respect to its intake temperature 23 (T in ), independently of the casting rate 6 .
  • the ingot mold coolant 2 is conveyed as water flow 13 . 1 from bottom to top, although in the case of thin-strand plants, it is also conveyed as water flow 13 . 2 from top to bottom.
  • FIG. 1B shows the coolant circulation in a functional block diagram, but in this case, with increasing casting rate from 1 m/min to a maximum of 12 m/min, the copper plate skin temperature 8 is adjusted to a desired constant value by a quantitative correction of the amount 4 of ingot mold coolant and/or of the intake temperature 5 of the ingot mold coolant, independently of the casting rate 6 and independently of the thickness 9 of the copper plates at a constantly adjusted intake temperature 5 of the ingot mold coolant.
  • the amount 4 of ingot mold coolant and the intake temperature 5 of the ingot mold coolant can be controlled by a process-control computer 27 for an online simulation model 27 . 4 and process data 27 .
  • the process-control computer 27 needs process data 27 . 1 and plant data 27 . 2 to control the amount 4 of ingot mold coolant via a pump station 22 . 1 and/or control valves 29 and to control the intake temperature 5 of the ingot mold coolant by the three-way valve 24 via controlled variables 27 . 3 .
  • a surge tank 30 is located in front of the pump station 22 . 1
  • FIG. 2A shows a heat flow 17 and a profile 16 of the casting rate 6 as a function of the casting time 18 .
  • the graph describes the course of casting from the start over a constant run-in rate window 6 . 2 with subsequent acceleration to a high rate level.
  • FIG. 2B shows the state of the art.
  • the actual copper plate skin temperature 8 denoted T Cu-actual
  • increases with increasing casting rate 6 and deviates from the desired copper plate skin temperature 8 denoted the copper plate target temperature 8 . 1 (T Cu-target ), since the amount 4 of ingot mold coolant and the intake temperature 5 of the ingot mold coolant for cooling the continuous casting ingot mold 1 are held constant.
  • the actual copper plate skin temperature 8 (T Cu-actual ) is caused to coincide with the desired copper plate skin temperature 8 , i.e., the copper plate target temperature 8 . 1 (T Cu-target ) by a suitable quantitative correction of the amount 4 of ingot mold coolant, independently of the casting rate 6 , at constant intake temperature 5 of the ingot mold coolant.
  • the copper plate skin temperature 8 (T Cu-actual ) is caused to coincide with the copper plate target temperature 8 . 1 (T Cu-target ) by suitable quantitative adjustment of the amount 4 of ingot mold coolant and of the intake temperature 5 of the ingot mold coolant as a function of the profile 16 of the casting rate over casting time 18 .
  • both influencing variables such as the amount 4 of ingot mold coolant or its flow rate, which increases the heat transfer, and the intake temperature 5 of the ingot mold coolant, which increases the potential and thus the heat flow
  • the run-in rate windows 6 . 2 with respect to the casting rate 6 are greater for a desired, actual copper plate skin temperature 8 at a given copper plate thickness 9 than is the case when only one of the two influencing variables is varied.
  • the difference between the previously known method and the method of the invention is clearly shown in FIG. 3.
  • the ingot mold plate skin temperature 8 as a function of the rising casting rate 6 which is a maximum of 12 m/min, is used as the basis of this comparison.
  • a horizontal straight line of the recrystallization temperature 12 represents the end of the thermal load of the copper plate made of cold-rolled copper, at which the copper loses its strength and/or its cold-rolled structure and thus its properties which are important for the casting of molten steel.
  • the temperature behavior 14 in the state of the art is described by the curve 14 . 1 (water flow from bottom to top) and the curve 14 . 2 (water flow from top to bottom). Both curves 14 . 1 and 14 .
  • the principle of the invention can also be applied to strip-casting machines operated at casting rates of up to 100 m/min. In this case, all measures applied at the height of the continuous casting ingot mold 1 are applied at the circumference of the twin rolls.

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  • 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)
US10/491,035 2001-09-28 2002-09-07 Method and device for cooling the copper plates of a continuous casting ingot mould for liquid metals, especially liquid steel Abandoned US20040256078A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10148135 2001-09-28
DE10148135.7 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
DE10160739.3 2001-12-11
PCT/EP2002/010030 WO2003028921A2 (de) 2001-09-28 2002-09-07 Verfahren und einrichtung zum kühlen der kupferplatten einer stranggiesskokille für flüssige metalle, insbesondere für flüssigen stahl

Publications (1)

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US20040256078A1 true US20040256078A1 (en) 2004-12-23

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US10/491,035 Abandoned US20040256078A1 (en) 2001-09-28 2002-09-07 Method and device for cooling the copper plates of a continuous casting ingot mould for liquid metals, especially liquid steel

Country Status (13)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080283213A1 (en) * 2004-01-17 2008-11-20 Rongjun Xu Water-Cooling Mold For Metal Continuous Casting

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080283213A1 (en) * 2004-01-17 2008-11-20 Rongjun Xu Water-Cooling Mold For Metal Continuous Casting
US7891405B2 (en) * 2004-01-17 2011-02-22 Baoshan Iron And Steel Co., Ltd. Water-cooling mold for metal continuous casting

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Publication number Publication date
RU2004113105A (ru) 2005-05-20
WO2003028921A3 (de) 2003-10-23
DE50206693D1 (de) 2006-06-08
EP1432539B1 (de) 2006-05-03
BR0212935A (pt) 2004-10-13
ATE324953T1 (de) 2006-06-15
CN1561273A (zh) 2005-01-05
EP1432539A2 (de) 2004-06-30
JP2005503927A (ja) 2005-02-10
MXPA04002744A (es) 2004-07-29
WO2003028921A2 (de) 2003-04-10
CA2460897A1 (en) 2003-04-10
HUP0402138A2 (hu) 2005-02-28
PL367404A1 (en) 2005-02-21

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