EP1013362A1 - Procédé et installation de coulée en continu de brames - Google Patents

Procédé et installation de coulée en continu de brames Download PDF

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Publication number
EP1013362A1
EP1013362A1 EP99124440A EP99124440A EP1013362A1 EP 1013362 A1 EP1013362 A1 EP 1013362A1 EP 99124440 A EP99124440 A EP 99124440A EP 99124440 A EP99124440 A EP 99124440A EP 1013362 A1 EP1013362 A1 EP 1013362A1
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EP
European Patent Office
Prior art keywords
mold
slab
cooling zone
strand
secondary cooling
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
EP99124440A
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German (de)
English (en)
Other versions
EP1013362B1 (fr
Inventor
Fritz-Peter Prof. Dr. Pleschiutschnigg
Joachim Schwellenbach
Michael Dr. Vonderbank
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
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Filing date
Publication date
Priority claimed from DE19916190A external-priority patent/DE19916190C2/de
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1013362A1 publication Critical patent/EP1013362A1/fr
Application granted granted Critical
Publication of EP1013362B1 publication Critical patent/EP1013362B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Definitions

  • the invention relates to a method and an apparatus for the continuous casting of Slabs, especially of steel, with molten material over a Pouring tube is poured into a mold as the primary cooling zone and then one Extracted strand from the mold and over a roller strand as a secondary cooling zone is guided, the means for applying a coolant to the strand surface having.
  • the slab formats are for standard slabs approx. 3,500 - 600 x 150 - 400 mm and and for thin slabs approx. 3,500 - 600 x 30 - 150 mm.
  • the casting speeds move with standard slabs between 0.3 - 2.5 m / min and for thin slabs up to max. 10 m / min.
  • Significant for Casting free of surface defects is uniform heat dissipation, in particular in the mold. The result of uneven heat dissipation are, for example Longitudinal cracks on the two broad sides of a slab in the mold immediately under the water level.
  • a conventional continuous casting machine ( Figure 2) is essentially composed from the mold 1 with the mold length 4.1, which is used for primary cooling 1.1 of the strand is required, and from the roller strand guide 4.2, which after the State of the art is equipped with a symmetrical spray cooling 5.1 is necessary for the secondary cooling of the strand.
  • Symmetrical spray cooling means that the spray nozzles for applying the cooling water are symmetrical Center axis across the strand width with the same pressure and the same amount of cooling water work. It should be noted that about 20 - 30% of the energy in the mold is released, which is removed until the slab solidifies at the end of the machine must become. This 20 - 30% of the energy is transferred to the copper plates Chilled water released.
  • the remaining energy is released in the secondary cooling area, that of a roller cage, the roller strand guide on the loose and fixed side and the spray cooling, which the strand surface and the strand shell with splash water symmetrical to the central axis across the width as a rule cools down to the end of the machine.
  • the solidification time of a standard slab with a thickness of, for example, 200 mm is approx. 16 min
  • a thin slab with a solidification thickness of, for example, 50 mm takes approx. 1 min for its solidification.
  • the system lengths for casting the standard slab are therefore 16 m in comparison to those of the thin slab with the same casting performance and a casting speed of 1 m / min in the case of the 200 mm thick standard slab or 4 m in the case of the 50 mm thick thin slab.
  • This example shows that the specific energy density in the case of the thin slab per m 2 of strand guidance is 4 times greater than that of the standard slab.
  • thermocouples placed in the mold plate are evenly distributed, discrete temperatures and heat flows to eat. However, these are discrete measurements that are only possible with high Allow effort to allow for integral measurement values differentiated across the mold width.
  • Another, relatively simple measuring system is the measurement of the heat flows or the temperature increases at the outlet openings between the mold plate and the water tank (DE 197 22 877), shown schematically in Figure 2.
  • the temperature increases are measured with water temperature sensors 9.1 individually measured over the broad sides 1.2 of the mold 1 and with the help of the respective partial amount of water 10.1 the partial heat flows 11.1 determined.
  • the sum of these measured values 10.1 and 11.1 is equal to the total values at the mold entrance and output can be measured.
  • the object of the invention based on a method and a device for the continuous casting of slabs propose with which it is possible to achieve a symmetrical final solidification or symmetrical slab geometry and a center symmetry across the width Ensure energy and temperature distribution.
  • the causes of the errors such as the asymmetrical Final solidification process, i.e. an asymmetrical swamp tip position, and the deflection of the slab from the central axis (Z), which is also an asymmetrical Geometry of the slab in the form of a wedge formation, already looking for asymmetrical heat dissipation across the width of the mold are.
  • These perturbations when pouring slabs are on the non-uniform Heat dissipation across the mold width, expressed as' hot spots' or 'cold spots' due, for example, to irregular slag formation and / or melt turbulence in the mold and in the mold level especially in the area of the diving spout.
  • Figure 1 shows schematically a continuous casting mold 1 with the mold length 4.1, the corresponds to the primary cooling zone 4.1, and a roller strand guide 4.2 as a secondary cooling zone.
  • the continuous casting mold 1 consists of two broad sides 1.2 and two narrow sides 1.3, in the liquid steel with the help of an immersion spout 2 using Casting powder 3 is introduced. With 1.1. are a water supply and drainage for the Primary cooling, 1.4 of the mold level. The mold exit is 1.5 featured.
  • the secondary cooling is regulated depending on this value across the width and length of the roller strand guide by individual Control of the spray nozzles in terms of quantity and distribution. So can the uneven heat flow distribution through dynamic spray cooling 5.2, which can work variably across the width, in the area of the roller strand guide 4.2 are dismantled again. This will both the slab energy as well the slab surface temperature symmetrically across the slab width Slab center axis (Z), with which a deflection of the slab 7.1 is less or is suppressed and the strand runs coaxially to the central axis of the strand guide. At the same time, the slab has a symmetrical geometry 8.1 without one disruptive wedge with symmetrical strand guidance.
  • the secondary cooling zone of the roller strand guide 4.2 is working independently Injection zones 5.2.1 divided, which are along the longitudinal axis of the roller strand guide extend. In areas of hot spots in the mold plate of the primary cooling zone there is hypothermia in the line, these areas are in the secondary cooling zone less chilled. Due to the regulated cooling in the secondary cooling zone there is a slab with a symmetrical solidification process 6.2.
  • the following devices are necessary to carry out the method: Heat flow measurement or temperature measurement over the mold width over time at the mold exit, independent spray zones across the mold width 5.2.1 in the Roller strand guide 4.2 or secondary cooling zone, a measuring device 14, preferably at the end of the secondary cooling zone, to determine the strand deflection 7.1 from the strand guide center axis in the X direction and / or for determination the strand geometry 8.1 (wedge / crowning) and / or a measuring device 14 for determining the slab temperature 14.1 over the slab width.
  • a Deflection of the slab course (7.1) is preferably by means of an optical System or determined using a line scan camera.
  • the slab geometry 8.1, such as wedge and crowning, is preferably determined using a system, that works on the principle of electromagnetic waves. To accommodate the Slab geometry, mechanical systems are also conceivable.
  • the temperature distribution 14.1 is also by means of optical systems or a line scan camera determined.
  • the energy or temperature distribution in the width direction (X) at the mold outlet 1.5 over time is preferably measured discretely by means of thermocouples, which are uniformly distributed in the copper plates of the narrow and broad sides 1.2 and 1.3 of the mold 1, and via a online "data processing determined.
  • the roller guide 4.2 Measuring devices for determining the strand surface temperature above the String width arranged.
  • FIG. 2 shows a mold 1 with a roller strand guide 4.2 and a spray cooling 5.1 spraying symmetrically over the slab width (X) According to the state of the art.
  • Corresponding components of Figure 2 are with the the same reference numerals of Figure 1. Because of the symmetrical Spray cooling results in an asymmetrical final solidification process 6.1.
  • the slab geometry is asymmetrical.
  • Figure 3 shows the integral measured in the production operation over the mold length 4.1 and partial heat flow distribution depending on the mold width (Y) of the casting time for both the fixed side ( Figure 3 a) and for the Losseite ( Figure 3 b).
  • These three-dimensional heat flow images of the lot and Fixed page that shows the partial heat flows 11.1 as 'online' pictures of the casting time (t) show that the heat flow density of a mold plate not uniformly over the mold width (Y) and at the same time not continuously over the casting time (t) behaves, but constantly changes over time and place.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP99124440A 1998-12-22 1999-12-08 Procédé et installation de coulée en continu de brames Expired - Lifetime EP1013362B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19859346 1998-12-22
DE19859346 1998-12-22
DE19916190A DE19916190C2 (de) 1998-12-22 1999-04-10 Verfahren und Vorrichtung zum Stranggießen von Brammen
DE19916190 1999-04-10

Publications (2)

Publication Number Publication Date
EP1013362A1 true EP1013362A1 (fr) 2000-06-28
EP1013362B1 EP1013362B1 (fr) 2003-06-25

Family

ID=26050943

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99124440A Expired - Lifetime EP1013362B1 (fr) 1998-12-22 1999-12-08 Procédé et installation de coulée en continu de brames

Country Status (2)

Country Link
EP (1) EP1013362B1 (fr)
AT (1) ATE243589T1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102489680A (zh) * 2011-12-28 2012-06-13 东北大学 一种智能控制宽厚板坯矫直区内弧角部温度的系统及方法
CN102847904A (zh) * 2012-09-11 2013-01-02 首钢总公司 一种动态控制板坯连铸结晶器冷却的系统和方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2542290A1 (de) * 1974-09-26 1976-04-08 Centre Rech Metallurgique Verfahren zum steuern des stranggiessens von metallen
DE3041607A1 (de) * 1980-11-01 1982-06-09 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zur optimierung der durch kuehlung beeinflussbaren brammenpualitaet beim stranggiessen
DE3305660A1 (de) * 1982-02-19 1983-09-08 Hitachi, Ltd., Tokyo Verfahren und vorrichtung zum korrigieren der kontur eines strangs fuer eine stranggussanlage
DE3423475A1 (de) * 1984-06-26 1984-11-29 Mannesmann AG, 4000 Düsseldorf Verfahren und einrichtung zum stranggiessen von fluessigen metallen, insbesondere von fluessigem stahl
DE4117073A1 (de) * 1991-05-22 1992-11-26 Mannesmann Ag Temperaturmessung brammenkokille
DE19612420A1 (de) * 1996-03-28 1997-10-02 Siemens Ag Verfahren und Einrichtung zur Steuerung der Kühlung eines Stranges in einer Stranggießanlage
JPH10263778A (ja) * 1997-03-24 1998-10-06 Kawasaki Steel Corp 連続鋳造における鋳片の二次冷却方法
DE19722877A1 (de) * 1997-05-31 1998-12-03 Schloemann Siemag Ag Verfahren und Vorrichtung zum Messen und Regeln von Temperatur und Menge von Kühlwasser für wasserkühlbare Kokillenwände einer Stranggießkokille

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2542290A1 (de) * 1974-09-26 1976-04-08 Centre Rech Metallurgique Verfahren zum steuern des stranggiessens von metallen
DE3041607A1 (de) * 1980-11-01 1982-06-09 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zur optimierung der durch kuehlung beeinflussbaren brammenpualitaet beim stranggiessen
DE3305660A1 (de) * 1982-02-19 1983-09-08 Hitachi, Ltd., Tokyo Verfahren und vorrichtung zum korrigieren der kontur eines strangs fuer eine stranggussanlage
DE3423475A1 (de) * 1984-06-26 1984-11-29 Mannesmann AG, 4000 Düsseldorf Verfahren und einrichtung zum stranggiessen von fluessigen metallen, insbesondere von fluessigem stahl
DE4117073A1 (de) * 1991-05-22 1992-11-26 Mannesmann Ag Temperaturmessung brammenkokille
DE19612420A1 (de) * 1996-03-28 1997-10-02 Siemens Ag Verfahren und Einrichtung zur Steuerung der Kühlung eines Stranges in einer Stranggießanlage
JPH10263778A (ja) * 1997-03-24 1998-10-06 Kawasaki Steel Corp 連続鋳造における鋳片の二次冷却方法
DE19722877A1 (de) * 1997-05-31 1998-12-03 Schloemann Siemag Ag Verfahren und Vorrichtung zum Messen und Regeln von Temperatur und Menge von Kühlwasser für wasserkühlbare Kokillenwände einer Stranggießkokille

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 1 29 January 1999 (1999-01-29) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102489680A (zh) * 2011-12-28 2012-06-13 东北大学 一种智能控制宽厚板坯矫直区内弧角部温度的系统及方法
CN102489680B (zh) * 2011-12-28 2013-05-08 东北大学 一种智能控制宽厚板坯矫直区内弧角部温度的系统及方法
CN102847904A (zh) * 2012-09-11 2013-01-02 首钢总公司 一种动态控制板坯连铸结晶器冷却的系统和方法
CN102847904B (zh) * 2012-09-11 2014-05-28 首钢总公司 一种动态控制板坯连铸结晶器冷却的系统和方法

Also Published As

Publication number Publication date
EP1013362B1 (fr) 2003-06-25
ATE243589T1 (de) 2003-07-15

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