EP1414603A1 - Method and installation for producing flat and elongated products - Google Patents

Method and installation for producing flat and elongated products

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Publication number
EP1414603A1
EP1414603A1 EP02794548A EP02794548A EP1414603A1 EP 1414603 A1 EP1414603 A1 EP 1414603A1 EP 02794548 A EP02794548 A EP 02794548A EP 02794548 A EP02794548 A EP 02794548A EP 1414603 A1 EP1414603 A1 EP 1414603A1
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EP
European Patent Office
Prior art keywords
strand
cooling section
furnace
separating device
plant
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
EP02794548A
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German (de)
French (fr)
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EP1414603B1 (en
Inventor
Thomas Fest
Dirk Letzel
Adolf Zajber
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SMS Siemag AG
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SMS Demag AG
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Publication of EP1414603A1 publication Critical patent/EP1414603A1/en
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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
    • B22D11/12—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
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting

Definitions

  • the invention relates to a method for the production of flat and long products in a production plant, for example from thin slabs, thick slabs, billets, blooms, carrier pre-profiles or the like with a continuous casting installation, comprising a mold, a strand guide with a pulling and straightening machine, one Cooling section and a separating device for the strand, as well as a downstream compensation furnace.
  • the invention also relates to an apparatus for performing the method.
  • the precipitation of aluminum nitride is one reason for these problems due to the rapid heating in direct hot charging and in the rolling process.
  • Aluminum nitrides can be found in most aluminum-tempered steels. These are formed and precipitated at the austenitic grain boundaries when the steel goes through the transformation phase from austenite to austenite plus ferrite. If the cast strand is then placed in a furnace for reheating before rolling, the precipitates remain at the austenitic grain boundaries even if the steel changes phase back to full austenite.
  • the precipitation of aluminum nitride creates further problems with other deposits such as copper, vanadium, etc., with the result of an extremely break-sensitive microstructure. According to a teaching of document EP 0 650 790 A1, the following is proposed to solve the aforementioned problems:
  • a surface temperature between 400 and 900 ° C after "natural tempering", i.e. a reheating by residual heat contained in the block is sought.
  • the positioning of a quenching box is also provided immediately after the pulling and straightening machine and before the separating device.
  • the document DE 44 16 752 A1 describes a method and a production plant for the production of hot wide strip.
  • the corresponding production plant consists of a continuous casting plant for thin slabs between 40 and 70 mm, a compensating furnace and a rolling mill, the exit temperature of the thin slab from the continuous casting machine being above 950 ° C. Between the continuous casting machine and the leveling furnace, the surface temperature of the slab is lowered to such an extent that a structural change from austenite to ferrite / pearlite occurs.
  • the cooling section used is designed as a water cooling section and consists of several chilled beams that can be switched on and off.
  • the previously known method preferably provides that the temperature of the thin slab is lowered to below 600 ° C. to a depth of at least 2 mm below the surface by choosing the cooling intensity.
  • the average surface temperature should not fall below the martensite threshold of the respective material quality.
  • the cooling time is chosen so that at least 70% austenite is converted into ferrite / pearlite.
  • the document EP 0 587 150 A1 describes a method for the heat treatment of continuously cast slabs or steel blocks, whereby surface brittleness can be effectively avoided. In particular, the occurrence of surface cracks can be effectively suppressed in the case of aluminum-calmed steels, even if the steels contain a proportion of 0.0080 to 0.0300 percent by weight of nitrogen and / or 0.03 to 0.25 percent by weight of lead.
  • the process comprises the steps:
  • the invention has for its object to provide a method for improving the surface of steel strands for all continuous casting formats, which offers independence from the casting speed and avoids "natural tempering" with core heat of the casting strand.
  • the invention proposes in a method according to the preamble of claim 1 that the positioning of the cooling section is carried out downstream behind the separating device, preferably in the immediate vicinity of the compensating furnace or preheating furnace.
  • the amount of water and the pressure gives the possibility of regulating the strand transport speed.
  • Another embodiment of the method provides that for the intensive removal of heat from the cooling section, this is enclosed with a covering and from it steam and residues of undevaporated cooling water are forcibly drawn off.
  • the invention advantageously provides that the water quantity and water pressure are controlled or regulated according to the current strand transport speed.
  • the positioning of the cooling section downstream behind the separating device the dependence of the cooling section on the speed of the casting process is eliminated.
  • a further embodiment of the method according to the invention provides that the distance between the pulling-out and straightening machine and the separating device is used for homogenizing the temperature of different strand areas, for example on edges or surfaces.
  • a further embodiment of the method according to the invention provides that the cooling section is arranged in an area of the strand guide with the highest possible temperature of the strand between the separating device and the compensating furnace.
  • a system for the production of flat or long products in a production system for example from thin slabs, thick slabs, billets, blooms, carrier pre-profiles or the like with a continuous casting system, comprising a mold, a strand guide with a pulling and straightening machine, a cooling section and a separating device
  • the equalizing furnace be arranged as close as possible behind the cooling section and that these be arranged as close as possible behind the separating device.
  • a mold 11 can be seen, which is designed for the continuous casting of a cast strand 6. Below this are segments 12 to 14 of a strand guide 1 with a large number of guide rollers.
  • the pulling and straightening machine 2 ensures that the strand 6 is pulled out and transported evenly. Behind it is the separating device in the transport direction. device 3 provided. It can be a pair of scissors or an oxy-fuel cutting machine. This is arranged at a comparatively close distance behind the pulling and straightening machine 2.
  • a suction device 10 with a powerful exhaust port is connected to the housing 9, which sucks off the steam generated during quenching and the unused water spray particles and forcibly withdraws it from the cooling section 4.
  • the compensating furnace or preheating furnace 5 is arranged at a close distance behind it, wherein recrystallization of the structure in the direction of pearlite / ferrite is initiated by external heat supply.
  • the "natural quenching" which is disadvantageous for the surface quality of the cast strand is avoided in this way.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Metal Rolling (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

The invention relates to a method for producing flat and/or elongated products, from for example, thin slabs, thick slabs, billets, blooms, preliminary support sections, or similar, in a production system, by means of a continuous casting installation. Said installation comprises a mould (11), a strand guide (1) with a drawing and straightening machine (2), a cooling section (4) and a separation device (3) for the strand (6), in addition to a compensating furnace or pre-heating furnace (5) that is located downstream. To improve the surface of steel strands, the cooling section (4) is positioned downstream behind the separation device (3), preferably in the immediate vicinity of the compensating furnace or pre-heating furnace (5). The invention also relates to the correspondingly configured production system.

Description

Verfahren und Anlage zur Produktion von Flach- und LangproduktenProcess and plant for the production of flat and long products
Die Erfindung betrifft ein Verfahren zur Produktion von Flach- und Langproduk- ten in einer Produktionsanlage, beispielsweise aus Dünnbrammen, Dickbrammen, aus Knüppeln, Blooms, Trägervorprofilen oder dergleichen mit einer Stranggießanlage, umfassend eine Kokille, eine Strangführung mit einer Auszieh- und Richtmaschine, eine Kühlstrecke und eine Trenneinrichtung für den Strang, sowie einen nachgeordneten Ausgleichsofen. Die Erfindung betrifft auch eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for the production of flat and long products in a production plant, for example from thin slabs, thick slabs, billets, blooms, carrier pre-profiles or the like with a continuous casting installation, comprising a mold, a strand guide with a pulling and straightening machine, one Cooling section and a separating device for the strand, as well as a downstream compensation furnace. The invention also relates to an apparatus for performing the method.
Verfahren der vorgenannten Art zur Oberflächenverbesserung von Stahlsträngen sind seit längerem bekannt. Hierüber berichtet u.a. eine Veröffentlichung in der Zeitschrift "FEATURE", August 1999, Seite 39, unter dem Titel: "Quenching for Improved Direct Hot Charging Quality". Darin ist beispielsweise ausgeführt, daß viele Stahlhersteller im Zusammenhang mit direkter Heiß-Chargierung bei aluminium-beruhigtem Stahl sowie bei Stahl-Legierungen Brüchigkeits- Probleme haben, und daß diese durch eine Präzisionskühlung der äußeren Schale des Stahlstrangs unmittelbar im Anschluß an den Gießprozeß gelöst werden können.Methods of the aforementioned type for improving the surface of steel strands have long been known. Reports on this include a publication in the magazine "FEATURE", August 1999, page 39, under the title: "Quenching for Improved Direct Hot Charging Quality". It states, for example, that many steel manufacturers have problems with brittleness in connection with direct hot charging for aluminum-soaked steel and for steel alloys, and that these can be solved by precision cooling of the outer shell of the steel strand immediately after the casting process ,
Die Ausscheidung von Aluminium-Nitrid ist ein Grund dieser Probleme wegen der schnellen Erhitzung bei direkter Heiß-Chargierung und beim Walzprozeß. Aluminium-Nitride finden sich in den meisten aluminium-beruhigten Stählen. Diese werden geformt und ausgeschieden an den austenitischen Korngrenzen, wenn der Stahl die Umwandlungsphase von Austenit zu Austenit plus Ferrit durchläuft. Wenn der Gußstrang dann in einen Ofen zur Wiedererhitzung vor dem Walzen eingebracht wird, verbleiben die Ausscheidungen an den austenitischen Korngrenzen, auch wenn der Stahl einen Phasenwechsel zurück zu vollständigem Austenit vollzieht. Die Ausscheidung von Aluminium-Nitrid ruft weitere Probleme mit anderen Ausscheidungen hervor wie Kupfer, Vanadium, u.a., mit dem Ergebnis einer extrem bruchempfindlichen MikroStruktur. Zur Lösung der vorgenannten Probleme wird nach einer Lehre des Dokumentes EP 0 650 790 A1 , folgendes vorgeschlagen:The precipitation of aluminum nitride is one reason for these problems due to the rapid heating in direct hot charging and in the rolling process. Aluminum nitrides can be found in most aluminum-tempered steels. These are formed and precipitated at the austenitic grain boundaries when the steel goes through the transformation phase from austenite to austenite plus ferrite. If the cast strand is then placed in a furnace for reheating before rolling, the precipitates remain at the austenitic grain boundaries even if the steel changes phase back to full austenite. The precipitation of aluminum nitride creates further problems with other deposits such as copper, vanadium, etc., with the result of an extremely break-sensitive microstructure. According to a teaching of document EP 0 650 790 A1, the following is proposed to solve the aforementioned problems:
Es wird eine thermische Behandlung von Stahl mit Erzielung einer feinkörnigen Oberfläche zur Vermeidung des schädlichen Einflusses von Verbindungen der Elemente AI; V; Nb (sog. Minimierung des "Hot Shortness" Effektes) vorgesehen. Für eine Minimierung von Oberflächenfehlern sollen Oberflächenspannungen abgebaut werden.It is a thermal treatment of steel with a fine-grained surface to avoid the harmful influence of compounds of the elements AI; V; Nb (so-called minimization of the "hot shortness" effect) is provided. Surface tensions should be reduced to minimize surface defects.
Weiterhin wird eine Oberflächentemperatur zwischen 400 und 900 °C nach dem "natural tempering", d.h. eine Wiedererwärmung durch im Block enthaltene Restwärme angestrebt. Auch wird die Positionierung einer Quenchingbox unmittelbar nach der Auszieh- und Richtmaschine und vor der Trenneinrichtung vorgesehen.Furthermore, a surface temperature between 400 and 900 ° C after "natural tempering", i.e. a reheating by residual heat contained in the block is sought. The positioning of a quenching box is also provided immediately after the pulling and straightening machine and before the separating device.
Das Dokument DE 44 16 752 A1 beschreibt ein Verfahren und eine Produktionsanlage zur Erzeugung von Warmbreitband. Die entsprechende Produktionsanlage besteht aus einer Stranggießanlage für Dünnbrammen zwischen 40 und 70 mm, einem Ausgleichsofen und einem Walzwerk, wobei die Austrittstemperatur der Dünnbramme aus der Stranggießmaschine oberhalb von 950 °C liegt. Zwischen der Stranggießmaschine und dem Ausgleichsofen wird die Oberflächentemperatur der Bramme in ausreichender Tiefe so weit abgesenkt, daß sich eine Gefügeumwandlung von Austenit in Ferrit/Perlit einstellt. Die eingesetzte Kühlstrecke ist als Wasserkühlstrecke ausgeführt und besteht aus mehreren zu- und abschaltbaren Kühlbalken.The document DE 44 16 752 A1 describes a method and a production plant for the production of hot wide strip. The corresponding production plant consists of a continuous casting plant for thin slabs between 40 and 70 mm, a compensating furnace and a rolling mill, the exit temperature of the thin slab from the continuous casting machine being above 950 ° C. Between the continuous casting machine and the leveling furnace, the surface temperature of the slab is lowered to such an extent that a structural change from austenite to ferrite / pearlite occurs. The cooling section used is designed as a water cooling section and consists of several chilled beams that can be switched on and off.
Vorzugsweise sieht das vorbekannte Verfahren vor, daß durch Wahl der Kühlintensität die Temperatur der Dünnbramme bis auf eine Tiefe von mindestens 2 mm unterhalb der Oberfläche auf unter 600 °C abgesenkt wird. Die mittlere Oberflächentemperatur soll die Martensitschwelle der jeweiligen Materialgüte nicht unterschreiten. Die Abkühlzeit ist so gewählt, daß mindestens 70 % Austenit in Ferrit/Perlit umgewandelt werden. Das Dokument EP 0 587 150 A1 beschreibt ein Verfahren zur Wärmebehandlung stranggegossener Brammen oder Stahlblöcke, wodurch Oberflächen- Brüchigkeit effektiv vermieden werden kann. Insbesondere kann bei aluminiumberuhigten Stählen das Auftreten von Oberflächenrissen effektiv unterdrückt werden, selbst wenn die Stähle einen Anteil von 0,0080 bis 0,0300 Gewichts- prozent von Nitrogen, und/oder von 0,03 bis 0,25 Gewichtsprozent Blei enthalten. Das Verfahren umfaßt die Schritte:The previously known method preferably provides that the temperature of the thin slab is lowered to below 600 ° C. to a depth of at least 2 mm below the surface by choosing the cooling intensity. The average surface temperature should not fall below the martensite threshold of the respective material quality. The cooling time is chosen so that at least 70% austenite is converted into ferrite / pearlite. The document EP 0 587 150 A1 describes a method for the heat treatment of continuously cast slabs or steel blocks, whereby surface brittleness can be effectively avoided. In particular, the occurrence of surface cracks can be effectively suppressed in the case of aluminum-calmed steels, even if the steels contain a proportion of 0.0080 to 0.0300 percent by weight of nitrogen and / or 0.03 to 0.25 percent by weight of lead. The process comprises the steps:
Kühlen einer Stranggußbramme oder eines in einer Gießform erzeugten Stahlblocks, um die Oberflächen-Temperatur 50 bis 150 °C höher als dessen Ar3- Umwandlungspunkt zu bringen, ferner die Bramme bzw. den Block derart zu kühlen, daß dessen Kern Rothitze besitzt, während die Oberfläche zu einer Bainit-Struktur umgewandelt wird, anschließend wird die Bramme bzw. der Block, Knüppel oder Vorprofil in einem Ofen erhitzt, gefolgt von einer Heiß- Formung.Cooling a continuous cast slab or steel block made in a mold to bring the surface temperature 50 to 150 ° C higher than its Ar3 transformation point, and further cooling the slab or block so that its core has red heat while the surface is converted to a bainite structure, then the slab or block, billet or pre-profile is heated in an oven, followed by hot forming.
Ausgehend vom vorgenannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein Verfahren zur Oberflächenverbesserung von Stahlsträngen für alle Stranggießformate anzugeben, das Unabhängigkeit von der Gießgeschwindigkeit bietet und das "natural-tempering" mit Kernwärme des Gießstranges vermeidet.Starting from the aforementioned prior art, the invention has for its object to provide a method for improving the surface of steel strands for all continuous casting formats, which offers independence from the casting speed and avoids "natural tempering" with core heat of the casting strand.
Zur Lösung der Aufgabe wird mit der Erfindung bei einem Verfahren gemäß dem Oberbegriff vom Anspruch 1 vorgeschlagen, daß die Positionierung der Kühlstrecke stromabwärts hinter der Trenneinrichtung, bevorzugt in unmittelbarer Nähe des Ausgleichsofens oder Vorwärmofens, vorgenommen wird.To achieve the object, the invention proposes in a method according to the preamble of claim 1 that the positioning of the cooling section is carried out downstream behind the separating device, preferably in the immediate vicinity of the compensating furnace or preheating furnace.
Mit der Erfindung ergeben sich u.a. folgende Vorteile:With the invention, inter alia, following advantages:
die Möglichkeit einer Minimierung der schädlichen Cu-Einflüsse bei Einsatz minderwertigen, preiswerteren Schrottes, wobei auch die schädlichen Effekte der vorgenannten Elemente AI, V, Nb und Pb weitgehend unterdrückt werden, - infolge der Positionierung hinter der Trenneinrichtung in unmittelbarer Nähe zum Vorwärmofen des Walzwerkes wird eine Wiedererwärmung der Oberfläche der Dünnbramme durch eigenen Wärmeinhalt (natural tempe- ring) vermieden; bei der vorgeschlagenen Position der Quenchingeinrichtung kann durch Abschirmen des Stranges vor dem Quenchen ein gewisser Temperaturausgleich im Strang erzielt werden; der Weg von der Streckrichtmaschine bis zur Schere kann zur Temperaturhomogenisierung genutzt werden; ein wesentlicher Vorteil im Quenchen nach dem Trennen besteht in der Unabhängkeit von der Gießgeschwindigkeit. Zusätzlich zur Steuerung derthe possibility of minimizing the harmful Cu influences when using inferior, less expensive scrap, the harmful effects of the aforementioned elements AI, V, Nb and Pb being largely suppressed, - As a result of the positioning behind the separating device in the immediate vicinity of the preheating furnace of the rolling mill, re-heating of the surface of the thin slab is avoided by its own heat content (natural temperature); in the proposed position of the quenching device, a certain temperature compensation in the strand can be achieved by shielding the strand before quenching; the path from the stretch leveler to the shears can be used for temperature homogenization; A major advantage of quenching after separation is that it is independent of the casting speed. In addition to controlling the
Wassermenge und des Druckes ergibt sich hier die Möglichkeit einer Regelung der Strangtransportgeschwindigkeit.The amount of water and the pressure gives the possibility of regulating the strand transport speed.
Weitere Ausgestaltungen des Verfahrens nach der Erfindung ergeben sich da- durch, daß in der Kühlstrecke die Oberflächenschicht des Stranges mittels energiereicher Hochdruck-Wassersprühstrahlen schockartig gekühlt und ein Wiederanlassen dieser Oberflächenschicht mittels Kernwärme des Stranges vorzugsweise durch fortgesetzt vergleichsweise geringe Kühlung verhindert wird.Further refinements of the method according to the invention result from the fact that in the cooling section the surface layer of the strand is cooled in a shock-like manner by means of high-pressure high-pressure water spray jets and that this surface layer is prevented from restarting by means of core heat of the strand, preferably by continued comparatively low cooling.
Eine weitere Verfahrens-Ausgestaltung sieht vor, daß zur intensiven Abfuhr von Wärmemengen aus der Kühlstrecke diese mit einer Umhüllung umschlossen und daraus Dampf sowie Reste unverdampften Kühlwassers zwangsweise abgezogen werden.Another embodiment of the method provides that for the intensive removal of heat from the cooling section, this is enclosed with a covering and from it steam and residues of undevaporated cooling water are forcibly drawn off.
Weiter sieht die Erfindung mit Vorteil vor, daß Wassermenge und Wasserdruck nach der aktuellen Strangtransportgeschwindigkeit gesteuert bzw. geregelt werden. Infolge der Positionierung der Kühlstrecke stromabwärts hinter der Trennvorrichtung wird die Abhängigkeit der Kühlstrecke von der Geschwindig- keit des Gießprozesses aufgehoben. Dabei sieht eine weitere Ausgestaltung des er indungsgemäßen Verfahrens vor, daß die Strecke zwischen der Auszieh- und Richtmaschine und der Trennvorrichtung zur Homogenisierung der Temperatur unterschiedlicher Strangbereiche, z.B. an Kanten oder Flächen, genutzt wird.Furthermore, the invention advantageously provides that the water quantity and water pressure are controlled or regulated according to the current strand transport speed. As a result of the positioning of the cooling section downstream behind the separating device, the dependence of the cooling section on the speed of the casting process is eliminated. A further embodiment of the method according to the invention provides that the distance between the pulling-out and straightening machine and the separating device is used for homogenizing the temperature of different strand areas, for example on edges or surfaces.
Und schließlich sieht eine weitere Ausgestaltung des Verfahrens nach der Erfindung vor, daß die Kühlstrecke in einem Bereich der Strangführung mit möglichst hoher Temperatur des Stranges zwischen der Trennvorrichtung und dem Ausgleichsofen angeordnet wird.And finally, a further embodiment of the method according to the invention provides that the cooling section is arranged in an area of the strand guide with the highest possible temperature of the strand between the separating device and the compensating furnace.
Bei einer Anlage zur Produktion von Flach- oder Langprodukten in einer Produktionsanlage, beispielsweise aus Dünnbrammen, Dickbrammen, aus Knüppeln, Blooms, Trägervorprofilen oder dergleichen mit einer Stranggießanlage, umfassend eine Kokille, eine Strangführung mit einer Auszieh- und Richtmaschine, eine Kühlstrecke und eine Trennvorrichtung für den Gußstrang sowie einen dieser nachgeordneten Ausgleichsofen oder Vorwärmofen, zur Durchführung des zuvor beschriebenen Verfahrens wird vorgeschlagen, daß der Ausgleichsofen in möglichst geringem Abstand hinter der Kühlstrecke und diese in möglichst geringem Abstand hinter der Trennvorrichtung angeordnet sind.In a system for the production of flat or long products in a production system, for example from thin slabs, thick slabs, billets, blooms, carrier pre-profiles or the like with a continuous casting system, comprising a mold, a strand guide with a pulling and straightening machine, a cooling section and a separating device For the cast strand and one of these subordinate equalizing furnaces or preheating furnaces, to carry out the method described above, it is proposed that the equalizing furnace be arranged as close as possible behind the cooling section and that these be arranged as close as possible behind the separating device.
Weitere Ausgestaltungen der Anlage ergeben sich aus den Unteransprüchen.Further designs of the system result from the subclaims.
Einzelheiten, Merkmale und Vorteile der Erfindung werden mit der nachstehenden Erläuterung eines in der Figur 1 rein schematisch dargestellten Ausführungsbeispieles verdeutlicht.Details, features and advantages of the invention are clarified with the following explanation of an embodiment shown purely schematically in FIG.
In dem Ausführungsbeispiel ist eine Kokille 11 zu sehen, welche zum Stranggießen eines Gußstranges 6 ausgebildet ist. Darunter befinden sich Segmente 12 bis 14 einer Strangführung 1 mit einer Vielzahl von Führungsrollen.In the exemplary embodiment, a mold 11 can be seen, which is designed for the continuous casting of a cast strand 6. Below this are segments 12 to 14 of a strand guide 1 with a large number of guide rollers.
Die Auszieh- und Richtmaschine 2 sorgt für einen gleichmäßigen Auszug und Transport des Stranges 6. Dahinter ist in Transportrichtung die Trenneinrich- tung 3 vorgesehen. Es kann sich dabei um eine Schere oder um eine Autogen- Trennschneidmaschine handeln. Diese ist in vergleichsweise dichtem Abstand hinter der Auszieh- und Richtmaschine 2 angeordnet.The pulling and straightening machine 2 ensures that the strand 6 is pulled out and transported evenly. Behind it is the separating device in the transport direction. device 3 provided. It can be a pair of scissors or an oxy-fuel cutting machine. This is arranged at a comparatively close distance behind the pulling and straightening machine 2.
In dichtem Abstand hinter der Trennvorrichtung 3 ist als besonderes Kennzei- chen der Erfindung eine Kühlstrecke 4 angeordnet, die mit Wassersprühdüsen 7 ausgestattet ist und von einem Gehäuse 9 umschlossen ist.A cooling section 4, which is equipped with water spray nozzles 7 and is enclosed by a housing 9, is arranged at a close distance behind the separating device 3 as a special feature of the invention.
An dem Gehäuse 9 ist eine Absaugeinrichtung 10 mit einem leistungsfähigen Exhaustor angeschlossen, welcher den beim Quenching entstehenden Dampf und die unverbrauchten Wassersprühteilchen absaugt und aus der Kühlstrecke 4 zwangsweise abzieht. Infolge der dichten Anordnung der Wassersprühdüsen 7 und ihres Betriebes mit Hochdruck-Wassersprühstrahlen, sowie unter dem Einfluß der Absaugvorrichtung 10 ergibt sich ein extrem hoher Wärmeaustausch zwischen dem durchlaufenden Strang 6 und dem angewendeten Kühl- mittel. Dadurch wird eine Kühlung der Oberflächenschicht 8 erreicht, die bspw. mindestens 2 mm beträgt.A suction device 10 with a powerful exhaust port is connected to the housing 9, which sucks off the steam generated during quenching and the unused water spray particles and forcibly withdraws it from the cooling section 4. As a result of the dense arrangement of the water spray nozzles 7 and their operation with high-pressure water spray jets, and under the influence of the suction device 10, there is an extremely high heat exchange between the continuous strand 6 and the coolant used. This achieves cooling of the surface layer 8, which is, for example, at least 2 mm.
Dahinter ist in dichtem Abstand der Ausgleichsofen bzw. Vorwärmofen 5 angeordnet, worin durch externe Wärmezufuhr eine Rekristallisation des Gefüges in Richtung Perlit/Ferrit initiiert wird. Das für die Oberflächengüte des Gußstranges nachteilige "natural quenching" wird auf diese Weise vermieden. The compensating furnace or preheating furnace 5 is arranged at a close distance behind it, wherein recrystallization of the structure in the direction of pearlite / ferrite is initiated by external heat supply. The "natural quenching" which is disadvantageous for the surface quality of the cast strand is avoided in this way.
Liste der BezugszeichenList of reference numbers
1 Strangführung1 strand guide
2 Auszieh- und Richtmaschine2 pulling and straightening machine
3 Trennvorrichtung 4 Kühlstrecke3 separator 4 cooling section
5 Ausgleichsofen / Vorwärmofen5 Equalization furnace / preheating furnace
6 Strang6 strands
7 Wassersprühstrahlen7 water sprays
8 Oberflächenschicht des Stranges 9 Gehäuse8 surface layer of the strand 9 housing
10 Exhaustor10 Exhaust gate
11 Kokille11 mold
12 Strangführungssegment12 strand guide segment
13 Strangführungssegment 14 Strangführungssegment 13 strand guide segment 14 strand guide segment

Claims

Patentansprüche claims
1. Verfahren zur Produktion von Flach- und/oder Langprodukten in einer Produktionsanlage, beispielsweise aus Dünnbrammen, Dickbrammen, aus Knüppeln, Blooms, Trägervorprofilen oder dergleichen mit einer Stranggießanlage, umfassend eine Kokille (11), eine Strangführung (1) mit einer Auszieh- und Richtmaschine (2), eine Kühlstrecke (4) und eine Trenneinrichtung (3) für den Strang (6), sowie einen nachgeordneten Ausgleichsofen oder Vorwärmofens (5), dad urch geken nzeich net, daß die Positionierung der Kühlstrecke (4) stromabwärts hinter der1. Process for the production of flat and / or long products in a production plant, for example from thin slabs, thick slabs, billets, blooms, carrier pre-profiles or the like with a continuous casting installation, comprising a mold (11), a strand guide (1) with a pull-out and straightening machine (2), a cooling section (4) and a separating device (3) for the strand (6), and a downstream compensating furnace or preheating furnace (5), characterized by the fact that the positioning of the cooling section (4) downstream behind the
Trenneinrichtung (3), bevorzugt in unmittelbarer Nähe des Ausgleichsofens oder Vorwärmofen (5), vorgenommen wird.Separating device (3), preferably in the immediate vicinity of the compensating furnace or preheating furnace (5).
2. Verfahren nach Anspruch 1, dad urch geken nzeic h net, daß in der Kühlstrecke (4) die Oberflächenschicht (8) des Stranges (6) mittels energiereicher Hochdruck-Wassersprühstrahlen (7) schockartig gekühlt und ein Wiederanlassen dieser Oberflächenschicht (8) mittels Kernwärme des Stranges (6) vorzugsweise durch fortgesetzt vergleichs- weise geringe Kühlung verhindert wird.2. The method according to claim 1, characterized by the fact that the surface layer (8) of the strand (6) is cooled in a shock-like manner by means of high-pressure high-pressure water spray jets (7) in the cooling section (4) and a restart of this surface layer (8) is carried out by means of Core heat of the strand (6) is preferably prevented by continued comparatively low cooling.
3. Verfahren nach Anspruch 1 oder 2, dad urc h gekennzei ch net, daß zur intensiven Abfuhr von Wärmemengen aus der Kühlstrecke (4) diese mit einer Umhüllung (9) umschlossen und daraus Dampf sowie3. The method according to claim 1 or 2, dad urc h gekennzei ch net that for the intensive dissipation of heat from the cooling section (4) enclosed this with an envelope (9) and from it steam and
Reste unverdampften Kühlwassers zwangsweise abgezogen werden.Residues of undevaporated cooling water are forcibly removed.
4. Verfahren nach einem oder mehreren der Ansprüche 1 bis 3, dad u rch gekennzei c h net, daß Wassermenge und -druck nach der aktuellen Strangtransportgeschwindigkeit gesteuert bzw. geregelt werden. 4. The method according to one or more of claims 1 to 3, dad u rch gekennzei c h net that water quantity and pressure are controlled or regulated according to the current strand transport speed.
Verfahren nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Strecke zwischen der Auszieh- und Richtmaschine (2) und der Trennvorrichtung (3) zur Homogenisierung der Temperatur unterschiedlicher Strangbereiche, z.B. an Kanten oder Flächen, genutzt wird. Method according to one or more of claims 1 to 4, characterized in that the distance between the pulling and straightening machine (2) and the separating device (3) is used to homogenize the temperature of different strand areas, for example on edges or surfaces.
6. Verfahren nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Kühlstrecke (4) in einem Bereich der Strangführung (1) mit möglichst hoher Temperatur des Stranges (6) zwischen der Trennvorrichtung (3) und dem Ausgleichsofen oder Vorwärmofen(δ) angeordnet wird.6. The method according to one or more of claims 1 to 5, characterized in that the cooling section (4) in a region of the strand guide (1) with the highest possible temperature of the strand (6) between the separating device (3) and the compensating furnace or preheating furnace (δ) is arranged.
7. Anlage zur Produktion von Flach- oder Langprodukten in einer Produktionsanlage, beispielsweise aus Dünnbrammen, Dickbrammen, aus Knüppeln, Blooms, Trägervorprofilen oder dergleichen mit einer Stranggieß- anläge, umfassend eine Kokille (11), eine Strangführung (1) mit einer7. Plant for the production of flat or long products in a production plant, for example from thin slabs, thick slabs, billets, blooms, carrier pre-profiles or the like with a continuous casting plant, comprising a mold (11), a strand guide (1) with a
Auszieh- und Richtmaschine (2), eine Kühlstrecke (4) und eine Trennvorrichtung (3) für den Gußstrang (6), sowie einen nachgeordneten Ausgleichsofen oder Vorwärmofen (5), insbesondere zur Durchführung des Verfahrens, dadurch gekennzeichnet, daß der Ausgleichsofen oder Vorwärmofen (5) in möglichst geringem Abstand hinter der Kühlstrecke (4), und diese in möglichst geringem Abstand hinter der Trennvorrichtung (3) angeordnet sind.Extracting and straightening machine (2), a cooling section (4) and a separating device (3) for the cast strand (6), as well as a downstream compensating furnace or preheating furnace (5), in particular for carrying out the method, characterized in that the compensating furnace or preheating furnace (5) at the smallest possible distance behind the cooling section (4), and these are arranged at the smallest possible distance behind the separating device (3).
8. Anlage nach Anspruch 7, dadurch gekennzeichnet, daß die Kühlstrecke (4) von einem Gehäuse (9) umschlossen ist, das mit einer Absaugvorrichtung (10), z.B. einem Exhaustor, in Verbindung steht.8. Plant according to claim 7, characterized in that the cooling section (4) is enclosed by a housing (9) which with a suction device (10), e.g. an Exhaustor.
9. Anlage nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß die Kühlstrecke (4) mit einer Vielzahl von Hochdruck-9. Plant according to claim 7 or 8, characterized in that the cooling section (4) with a variety of high pressure
Wassersprühdüsen (7) ausgestattet ist, die den Gußstrang (6) allseitig umgeben.Water spray nozzles (7) is equipped, which surround the cast strand (6) on all sides.
10. Anlage nach einem oder mehreren der Ansprüche 7 bis 9, dadurch gekennzeichnet, daß die Auszieh- und Richtmaschine (2), die Trennvorrichtung (3) und die Kühlstrecke (4) gemeinsam innerhalb einer ungeteilten Isolierhaube angeordnet sind. 10. Plant according to one or more of claims 7 to 9, characterized in that the pulling and straightening machine (2), the separating device (3) and the cooling section (4) are arranged together within an undivided insulating hood.
EP02794548A 2001-08-07 2002-08-05 Method and installation for producing flat and elongated products Expired - Lifetime EP1414603B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10138794 2001-08-07
DE10138794A DE10138794A1 (en) 2001-08-07 2001-08-07 Process and plant for the production of flat and long products
PCT/EP2002/008711 WO2003013763A1 (en) 2001-08-07 2002-08-05 Method and installation for producing flat and elongated products

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EP1414603A1 true EP1414603A1 (en) 2004-05-06
EP1414603B1 EP1414603B1 (en) 2005-01-12

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AT (1) ATE286792T1 (en)
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DE102006056683A1 (en) 2006-01-11 2007-07-12 Sms Demag Ag Continuous casting of metal profiles, first cools cast strip then permits thermal redistribution to re-heat surface before mechanical deformation
CN101351285B (en) * 2006-01-11 2011-12-28 Sms西马格股份公司 Method and apparatus for continuous casting
DE102009048567B4 (en) 2008-10-23 2022-07-21 Sms Group Gmbh Method and arrangement for cooling a cast strand in a continuous casting plant
DE102009049897B4 (en) 2009-10-20 2023-09-14 Sms Group Gmbh Method and device for continuously casting a metal strand
CN107866359A (en) * 2017-12-20 2018-04-03 南通亿思特机器人科技有限公司 One kind leaching modeling compensated chain production equipment

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DE19529049C1 (en) * 1995-07-31 1997-03-20 Mannesmann Ag High-speed thin slab plant
JP3952580B2 (en) * 1998-03-09 2007-08-01 大同特殊鋼株式会社 Online quality judgment method and equipment for surface quality of slabs and steel slabs in continuous casting and ingot rolling
JP2000246411A (en) * 1999-02-26 2000-09-12 Sanyo Special Steel Co Ltd Manufacture of continuously cast bloom
DE19953252A1 (en) * 1999-11-04 2001-05-10 Sms Demag Ag Process for the surface treatment of a continuously cast steel product and device therefor

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DE50202008D1 (en) 2005-02-17
DE10138794A1 (en) 2003-02-27
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ATE286792T1 (en) 2005-01-15
EP1414603B1 (en) 2005-01-12

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