EP1937429B1 - Verfahren und vorrichtung zum stranggiessen - Google Patents

Verfahren und vorrichtung zum stranggiessen Download PDF

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Publication number
EP1937429B1
EP1937429B1 EP06841185A EP06841185A EP1937429B1 EP 1937429 B1 EP1937429 B1 EP 1937429B1 EP 06841185 A EP06841185 A EP 06841185A EP 06841185 A EP06841185 A EP 06841185A EP 1937429 B1 EP1937429 B1 EP 1937429B1
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EP
European Patent Office
Prior art keywords
cooling
metal strip
section
continuous casting
strip
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.)
Active
Application number
EP06841185A
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German (de)
English (en)
French (fr)
Other versions
EP1937429A1 (de
Inventor
Uwe Plociennik
Jens Kempken
Peter Jonen
Ingo Schuster
Tilmann BÖCHER
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SMS Group GmbH
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SMS Demag AG
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Publication date
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Application filed by SMS Demag AG filed Critical SMS Demag AG
Priority to PL06841185T priority Critical patent/PL1937429T3/pl
Publication of EP1937429A1 publication Critical patent/EP1937429A1/de
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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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • 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
    • B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
    • 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
    • B22D11/141—Plants for continuous casting for vertical casting

Definitions

  • the invention relates to a method for the continuous casting of slab, Dünnbrammen-, Vorblock-, Vorprofil-, Rundprofil-, Rohrprofil- or billet strands and the like of liquid metal in a continuous casting, in which metal emerges from a mold vertically downwards, wherein the metal strip then vertically downwardly guided along a vertical strand guide and thereby cooled, wherein the metal strip is then bent from the vertical direction in the horizontal direction and wherein in the end region of the bend in the horizontal direction or after the bend in the horizontal direction, a mechanical deformation of the metal strip he follows. Furthermore, the invention relates to a continuous casting plant, in particular for carrying out this method.
  • a generic method for continuous casting is for example from the EP 1 108 485 A1 or from the WO 2004/048016 A2 known.
  • liquid metal in particular steel
  • a mold wherein it solidifies and forms a metal band which is gradually diverted or bent from the vertical direction into the horizontal direction.
  • a vertical strand guide which initially leads the still very hot metal strip vertically below.
  • the metal strip is gradually bent by appropriate rollers or rollers in the horizontal.
  • the EP 1 108 485 A1 proposes for this purpose a device for cooling the cast strand in a cooling zone, in which the strand by means of pairs of rollers which are arranged transversely to the strand axis along the strand withdrawal direction one above the other, supported, wherein the application of coolant further cools the strand.
  • the proposed device comprises a coolant-conveying coolant element arranged between two rollers lying one on top of the other, which extends along the longitudinal axis of the rollers and is designed such that gaps are created between the respective cooling element and the roller and the cooling element and the strand. wherein the respective cooling element is provided with at least one coolant-conveying, opening into a gap channel.
  • the WO 2004/048016 A2 provides for optimal temperature control of the cast metal strip, which is determined by the outlet temperature, which is determined by controlling the surface temperature at the end of the metallurgical strand length of the cast strand, a dynamic spray system in the form of water volume distribution and pressure distribution or impulse distribution over the strand width and strand length functional to a is controlled for the strand length and the strand width calculated temperature profile curve.
  • the invention is therefore based on the object niezuentwickein a method of the type mentioned above and a corresponding device such that it is possible, in addition to optimal cooling of the metal strip also to achieve that the scaling of the strip surface is minimized.
  • the solution of this problem by the invention according to the method is achieved in that in the conveying direction of the metal strip behind the mold and before the mechanical deformation of the metal strip in a first section, a cooling of the metal strip with a heat transfer coefficient between 3,000 and 10,000 W / (m 2 K) , In the conveying direction after cooling in a second section by heat balance in the metal strip with or without reduced cooling of the surface of the metal strip, the surface of the metal strip is heated to a temperature Ac3 or Ar3, after which the mechanical deformation takes place in a third section.
  • the surfaces of the metal strip are cleaned before being exposed to the cooling medium for cooling, the effect of subsequent cooling can be further improved.
  • the cleaning can be done by descaling, for example, by the fact that in strand or metal strip extraction direction opposite each other, first reached by the metal strip / strand and thus foremost or topmost coolant (nozzles, nozzle bar od. Like.)
  • the cooling medium under high pressure Apply so that a descaling results.
  • the mechanical deformation in the third section can be a straightening process of the metal strip or include such a process. Alternatively or additionally, it may be provided that the mechanical deformation in the third section is a rolling process of the metal strip or comprises such a process.
  • the cooling in the first section can be limited to the region of the vertical strand guide, designed as intensive cooling.
  • the term of the vertical strand guide should also include that the metal strip is guided largely vertically.
  • the cooling in the first section can also take place intermittently, wherein the metal strip / strand is alternately intensively and weakly cooled, for example by changing thedemediumbeaufschlagungsêt [I: min: m 2 ] and / or setting different distances of the coolant to the metal strip.
  • the proposed continuous casting for continuous casting of slabs, Dünnbrammen-, Vorblock-, Vorprofil-, Rundprofil-, Rohrprofil- or billet strands and the like of liquid metal, with a mold, from which the metal exits vertically downwards, a below the mold arranged vertical Strand guide and means for bending the metal strip from the vertical direction in the horizontal direction, wherein mechanical Umformkar for the metal strip are arranged in the end region of the bend in the horizontal direction or after the bend in the horizontal direction, according to the invention is characterized in that the vertical Strand guide has a number in the conveying direction of the metal strip disposed on both sides of the metal strip rollers, wherein in the region of the rollers first cooling means are arranged, with which a cooling fluid can be applied to the surface of the metal strip, wherein the cooling means in vertical and / or horizontal R ichtung are arranged displaceably and wherein additional second Coolant are arranged stationary in the vertical strand guide
  • the coolant can advantageously be designed to be oscillatable.
  • the first and / or the second coolant may have a housing, from which the cooling fluid is applied by means of at least one nozzle.
  • the cooling fluid can be applied from the housing by means of two nozzles or rows of nozzles.
  • a cooling with a defined intensity which is chosen so that on the one hand a high-quality metal strip can be produced, which has the desired microstructure and microstructure composition, but on the other hand also the degree of scaling of the strip surface minimal can be held.
  • the proposal also reduces the accumulation of undesirable side effects on the strip surface.
  • the proposed method reduces the risk of excretions or so-called "hot shortness", so that advantages are also achieved in this regard. Due to the lowering of the surface temperature required for the thermal shock - this should not be lower than the martensite start temperature - the austenite in the metal strip is converted into ferrite with a grain refining. In the subsequent reheating due to the large temperature gradient between the strand surface and the core of the metal strip, a re-conversion of the fine ferrite into austenite with small grains takes place. In these conversions, the aluminum nitrides (AIN) or other precipitates are overgrown, and on the grain boundaries are percent less aluminum nitrides than the large austenite grain before conversion. The finer structure is therefore less susceptible to cracking if excreta should be present.
  • the area for intensive cooling is provided so that the reheating can take place as early as possible.
  • the ferrite transformation and the subsequent transformation into austenite should take place before the mechanical loading of the strand surface, for example in the bending drivers.
  • said (intensive) cooling comprises about one-quarter to one-third of the (arc) path from the mold to the mechanical forming, followed by about three quarters or two-thirds of this path, on which no more or only reduced cooling is.
  • the proposed inventive intensive cooling can be arranged between the strand guide rollers and extend over a longer region of the strand guide depending on the desired cooling effect. It can also be advantageous, as stated, to apply the intensive cooling intermittently in order not to overcool the surface, especially in the case of materials susceptible to cracking.
  • the hot brittleness ie the cracking of the slab surface
  • the hot brittleness can be reduced, which can be caused in particular by a high copper content in the material. This is especially with scrap as starting material relevant, which sometimes has a correspondingly high copper content.
  • Fig. 1 schematically a continuous casting 2 is shown.
  • Liquid metallic material emerges vertically downwards as a strand 1 from a mold 3 in the conveying direction F and is gradually redirected from the vertical V to the horizontal H along a casting arc section.
  • a vertical strand guide 4 having a number of rollers 10 which guide the metal strip 1.
  • a number of rollers 9 act as a means for bending the metal strip 1 from the vertical V to the horizontal H.
  • this is a straightening driver which subjects the metal strip 1 to mechanical straightening by means of mechanical deformation and can also be provided with a rolling process, which is usually followed.
  • the area of the metal strip from the exit from the mold 3 to the mechanical deformation is subdivided into three sections: in a first section 6
  • a second section 7 virtually no more cooling is made, and located in the metal strip 1 heat warms the cooled surface of the metal strip 1 again.
  • the mechanical deformation takes place.
  • the exemplary embodiment shows that the first section 6 is again subdivided into subsections. This allows in a simple manner an intermittent cooling in the first section 6, namely an intensive cooling in a first section and a weaker or reduced or even no cooling in the at least one further follower section, which in turn can then be followed by an intensive cooling section and so on.
  • the cooling of the metal strip 1 is carried out with first coolants 11 and second coolants 12, as is best in Fig. 2 can be seen.
  • the first cooling means 11 work so intensively that a large cooling capacity is present.
  • the second coolant 12 is conventional and per se known coolant, which are used in previously known continuous casting.
  • the design of the coolant 11 is carried out so that the cooling of the metal strip 1 in the first section 6, in particular in the immediately following part of the mold 3, its in the extension direction F uppermost or frontmost coolant for descaling and thus cleaning the surfaces of the metal strip 1
  • High pressure switchable with a heat transfer coefficient between 3,000 and 10,000 W / (m 2 K) takes place. In this case, the majority of the cooling goes back to the first coolant 11.
  • the heat transfer coefficient (symbol ⁇ ), also called heat transfer coefficient or heat transfer coefficient, is a proportionality factor which determines the intensity of the heat transfer at a surface.
  • the heat transfer coefficient here describes the ability of a gas or a liquid to dissipate energy from the surface of a substance or to deliver it to the surface. It depends, among other things, on the specific heat, the density and the thermal conductivity coefficient of the heat-dissipating and the heat-delivering medium. The calculation of the coefficient for heat conduction usually takes place via the temperature difference of the media involved.
  • the factors mentioned immediately show that the design of the intensity of the cooling has direct effects on the heat transfer coefficient.
  • the cooling capacity can be influenced for example by changing the horizontal distance between the cooling means 11 and 12 and the metal strip 1; it becomes lower, the greater the distance.
  • the mentioned coolant 11 are not needed for every application. Therefore, they are - how it looks Fig. 2 emerges - arranged displaceably in the vertical direction, with corresponding means of movement are not shown. Shown are the coolant 11 in solid lines in its active position, wherein the ejected jet cooling water takes the outlined course.
  • the coolant 11 can be moved vertically in the position shown in dashed lines, so that a classic, lower, d. H. less intensive cooling by the coolant 12 is accomplished.
  • the cooling means 11 have a housing 13, on whose side facing the metal strip 1, two nozzles 14 and 15 or rows of nozzles extending perpendicularly to the plane of the drawing over the metal strip 1 are arranged.
  • the housing 13 has in its interior according to two chambers 16, 17 which are each fluidly connected to a water supply line.
  • the nozzles 14 and 15 are designed differently, so that different amounts of water currents can be directed to the metal strip 1 - depending on the technological need to achieve a scale-free as possible and thus cleaned surface of Metallbandes1.
  • the nozzles may also be designed as nozzle bars, d. H. as a beam which extends across the width of the metal strip 1 and passes cooling water from a number of nozzle openings on the strip surface.
  • the proposed device for intensive cooling thus has a housing which can be pushed with a small distance between the continuous casting guide rollers 10 and thus forms a cooling channel.
  • the housing 13 can be protected from destruction by a fender (not shown) in the event of a breakthrough, so that it can be reused in this case.
  • a fender not shown
  • the cooling effect can be influenced. Further influence on the cooling effect can be achieved by the construction of the housing and the nozzles 14, 15.
  • a subcooling of the edge region of the metal strip can also be avoided by switching on and off of nozzle groups.
  • spray nozzles can also be used. These should be distributed close to each other across the width of the metal strip to achieve the necessary cooling and cooling and grain refining and descaling effect associated therewith. By switching these groups on and off, subcooling of the edges can also be avoided.
  • the nozzles can be deactivated, swung away, moved away or the flow of cooling medium (water) can be lowered to ensure standard cooling.
  • additional cooling consisting of several provided with spray nozzles spray bar are used with a separate water supply.
  • the additional spray bars are only switched on when needed.
  • subcooling of the edges can also be avoided here by switching on and off of nozzle groups.
  • Such nozzles are not used for the present invention because of their excessive cooling effect and the associated low surface temperature of the surface of the metal strip or they are not useful here.
  • the core idea according to the invention can therefore be seen in the fact that intensive cooling takes place in the area of secondary cooling, in particular in thin slab plants, in order to achieve a cleaning of the surface of the slab in which the intensive cooling begins shortly after the mold, viewed in the conveying direction.
  • the cooling ends so early that reheating can take place above the temperature Ac3 or Ar3 before mechanical stresses occur, as is the case, for example, with the bending driver.
  • the aim is to have no or only a small excretion on the grain boundaries.
  • the proposed device for intensive cooling has a significantly higher cooling effect than is otherwise the case with the secondary cooling of a continuous casting plant.
  • the usual heat transfer coefficients are between 500 W / (m 2 K) and 2,500 W / (m 2 K).
  • descaling plants are known in which a cooling device is used which realizes heat transfer numbers of more than 20,000 W / (m 2 K).
  • the heat transfer rates required here are - as already indicated above - material-dependent and also dependent on the casting speed. They result from the maximum cooling rate at which no martensite or interstitial structure is yet produced.
  • the cooling rate is about 2,500 ° C / min, which corresponds to a heat transfer coefficient of about 5,500 W / (m 2 K) at a casting speed of 5.0 m / min.
  • the intensity of the cooling can be varied by the number of nozzles arranged side by side. Furthermore, it is also possible to use additional nozzle bars to conventional spray cooling devices.
  • the length of the intensive cooling - viewed in the conveying direction F - is determined by the solidification structure to 2 mm below the surface of the metal strip. In the case of dendritic solidification, the intensive cooling length is lengthened by about a factor of 2 to 3 compared with the length in the case of globulitic solidification.
  • the heat transfer coefficient also results from the design of the coolant, in this case in particular the first coolant 11.
  • the number is selected specifically in the claimed range, since the conditions for intensive cooling of the finished metal strip 1 are optimal and at the same time a largely scaling belt surface can be achieved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Metal Rolling (AREA)
  • Casting Devices For Molds (AREA)
EP06841185A 2006-01-11 2006-12-28 Verfahren und vorrichtung zum stranggiessen Active EP1937429B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06841185T PL1937429T3 (pl) 2006-01-11 2006-12-28 Sposób i urządzenie do odlewania ciągłego

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102006001464 2006-01-11
DE102006056683A DE102006056683A1 (de) 2006-01-11 2006-11-30 Verfahren und Vorrichtung zum Stranggießen
PCT/EP2006/012560 WO2007087893A1 (de) 2006-01-11 2006-12-28 Verfahren und vorrichtung zum stranggiessen

Publications (2)

Publication Number Publication Date
EP1937429A1 EP1937429A1 (de) 2008-07-02
EP1937429B1 true EP1937429B1 (de) 2009-03-18

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ID=37909512

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Application Number Title Priority Date Filing Date
EP06841185A Active EP1937429B1 (de) 2006-01-11 2006-12-28 Verfahren und vorrichtung zum stranggiessen

Country Status (16)

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US (2) US8596335B2 (enExample)
EP (1) EP1937429B1 (enExample)
JP (1) JP5039712B2 (enExample)
KR (1) KR101037078B1 (enExample)
AT (1) ATE425827T1 (enExample)
AU (1) AU2006337470B2 (enExample)
BR (1) BRPI0620971B1 (enExample)
CA (1) CA2635128C (enExample)
DE (2) DE102006056683A1 (enExample)
EG (1) EG24892A (enExample)
ES (1) ES2321234T3 (enExample)
MY (1) MY143585A (enExample)
PL (1) PL1937429T3 (enExample)
RU (1) RU2377096C1 (enExample)
TW (1) TWI382888B (enExample)
WO (1) WO2007087893A1 (enExample)

Cited By (3)

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DE102014214374A1 (de) 2014-07-23 2016-01-28 Sms Group Gmbh Verfahren zur Herstellung eines metallischen Produkts
DE102017213842A1 (de) 2017-08-08 2019-02-14 Sms Group Gmbh Verfahren und Anlage zum Stranggießen eines metallischen Produkts
DE102023211833A1 (de) * 2023-11-28 2025-05-28 Sms Group Gmbh Vorrichtung und Verfahren zum Kühlen eines Gießstrangs in einer Stranggießanlage

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CN109158561B (zh) * 2018-04-25 2024-03-22 西安麦特沃金液控技术有限公司 一种引锭杆处理装置及立式连续铸造系统
CN110369686A (zh) * 2019-07-03 2019-10-25 西安理工大学 一种铸铁水平连铸三次喷冷装置
KR20210051247A (ko) 2019-10-30 2021-05-10 이준수 연속 주조용 세그먼트 모니터링 방법
CN111495971A (zh) * 2020-05-06 2020-08-07 义乌聚龙自动化科技有限公司 一种铝合金板连铸连轧设备和方法
IT202000010909A1 (it) * 2020-05-13 2021-11-13 Danieli Off Mecc Apparato di raffreddamento secondario in una macchina per colata continua di prodotti metallici
BR112022022196A2 (pt) * 2020-07-22 2023-01-31 Novelis Inc Sistema de molde de fundição com resfriamento direto
DE102020211720A1 (de) 2020-09-18 2022-03-24 Sms Group Gmbh Verfahren und Sprüheinrichtung zur thermischen Oberflächenbehandlung eines metallischen Produkts
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JP3702807B2 (ja) * 2001-04-11 2005-10-05 住友金属工業株式会社 連続鋳造方法
BRPI0111910B1 (pt) * 2001-04-25 2016-07-26 Jfe Eng Corp método de produção para um produto de aço lingotado continuamente e equipamento para medir o estado de solidificação de um produto de aço lingotado continuamente
DE10138794A1 (de) * 2001-08-07 2003-02-27 Sms Demag Ag Verfahren und Anlage zur Produktion von Flach- und Langprodukten
DE50211289D1 (de) * 2002-02-28 2008-01-10 Lechler Gmbh Kühlanordnung für das Walzgerüst einer Stranggussanlage
JP2003275852A (ja) * 2002-03-18 2003-09-30 Jfe Steel Kk 鋼の連続鋳造方法および装置
ES2210203T3 (es) 2002-04-18 2004-07-01 Lechler Gmbh Boquilla rociadora binaria con una pieza de insercion intercambiable.
JP4042541B2 (ja) 2002-11-19 2008-02-06 Ｊｆｅスチール株式会社 連続鋳造鋳片の二次冷却装置および二次冷却方法
DE10255550B3 (de) 2002-11-28 2004-01-22 Sms Demag Ag Verfahren und Einrichtung zum Stranggießen von Brammen-, Dünnbrammen-, Vorblock-, Vorprofil-, Knüppelsträngen und dgl. aus flüssigem Metall, insbesondere aus Stahlwerkstoff
JP4321325B2 (ja) * 2004-03-29 2009-08-26 Ｊｆｅスチール株式会社 連続鋳造鋳片の二次冷却方法
AT503526B1 (de) 2006-04-25 2008-07-15 Voest Alpine Ind Anlagen Spritzdüsen-verstelleinrichtung

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014214374A1 (de) 2014-07-23 2016-01-28 Sms Group Gmbh Verfahren zur Herstellung eines metallischen Produkts
US10894994B2 (en) 2014-07-23 2021-01-19 Sms Group Gmbh Method for producing a metal product
DE102017213842A1 (de) 2017-08-08 2019-02-14 Sms Group Gmbh Verfahren und Anlage zum Stranggießen eines metallischen Produkts
DE102023211833A1 (de) * 2023-11-28 2025-05-28 Sms Group Gmbh Vorrichtung und Verfahren zum Kühlen eines Gießstrangs in einer Stranggießanlage
EP4563263A1 (de) 2023-11-28 2025-06-04 SMS Group GmbH Vorrichtung und verfahren zum kühlen eines giessstrangs in einer stranggiessanlage

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WO2007087893A1 (de) 2007-08-09
EP1937429A1 (de) 2008-07-02
TWI382888B (zh) 2013-01-21
US8522858B2 (en) 2013-09-03
US20120111527A1 (en) 2012-05-10
US20090095438A1 (en) 2009-04-16
AU2006337470B2 (en) 2010-02-04
KR101037078B1 (ko) 2011-05-26
ATE425827T1 (de) 2009-04-15
DE502006003212D1 (de) 2009-04-30
PL1937429T3 (pl) 2009-08-31
TW200732062A (en) 2007-09-01
BRPI0620971B1 (pt) 2015-07-21
MY143585A (en) 2011-05-31
US8596335B2 (en) 2013-12-03
JP2009522110A (ja) 2009-06-11
ES2321234T3 (es) 2009-06-03
CA2635128C (en) 2012-07-17
BRPI0620971A2 (pt) 2011-11-29
DE102006056683A1 (de) 2007-07-12
EG24892A (en) 2010-12-13
KR20080081173A (ko) 2008-09-08
AU2006337470A1 (en) 2007-08-09
CA2635128A1 (en) 2007-08-09
RU2377096C1 (ru) 2009-12-27

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