EP1414603B1 - Method and installation for producing flat and elongated products - Google Patents
Method and installation for producing flat and elongated products Download PDFInfo
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- EP1414603B1 EP1414603B1 EP02794548A EP02794548A EP1414603B1 EP 1414603 B1 EP1414603 B1 EP 1414603B1 EP 02794548 A EP02794548 A EP 02794548A EP 02794548 A EP02794548 A EP 02794548A EP 1414603 B1 EP1414603 B1 EP 1414603B1
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- strand
- cooling line
- cutting device
- furnace
- cooling
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- 238000000034 method Methods 0.000 title claims description 23
- 238000009434 installation Methods 0.000 title abstract 3
- 238000001816 cooling Methods 0.000 claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 238000009749 continuous casting Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 7
- 239000002344 surface layer Substances 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000000265 homogenisation Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 14
- 239000010959 steel Substances 0.000 abstract description 14
- 238000000926 separation method Methods 0.000 abstract description 5
- 238000010791 quenching Methods 0.000 description 7
- 230000000171 quenching effect Effects 0.000 description 7
- 238000005266 casting Methods 0.000 description 6
- 229910001566 austenite Inorganic materials 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005496 tempering Methods 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 230000009931 harmful effect Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- -1 Aluminum nitrides Chemical class 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000029142 excretion Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 125000000018 nitroso group Chemical group N(=O)* 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
Images
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 process for the production of flat and long products in a production plant, for example from thin slabs, thick slabs, from billets, Blooms, Stroms, Stromervorprofilen or the like with a Continuous casting plant, comprising a mold, a strand guide with an extractor and leveler, a cooling section and a separator for the Strand, as well as a downstream equalization furnace, with the positioning the cooling section downstream behind the separator, preferably in the immediate Near the equalizing or preheating furnace.
- the invention also relates to a device for carrying out the method.
- the precipitation of aluminum nitride is one of the reasons for these problems rapid heating in direct hot-batching and rolling process.
- Aluminum nitrides are found in most aluminum-tempered steels. These are formed and precipitated at the austenitic grain boundaries, when the steel is the transformation phase from austenite to austenite plus ferrite passes. When the cast strand is then in a stove for reheating the rolling is introduced, the precipitates remain on the austenitic Grain limits, even if the steel is a phase change back to complete austenite.
- the excretion of aluminum nitride calls further problems with other precipitates such as copper, vanadium, among others, resulting in an extremely fragile microstructure.
- a surface temperature between 400 and 900 ° C after the "natural tempering", i. a reheating by contained in the block Residual heat desired is also immediate after the extraction and straightening machine and before the separator intended.
- the document DE 44 16 752 A1 describes a method and a production plant for the production of hot rolled strip.
- the corresponding production plant consists of a continuous caster for thin slabs between 40 and 70 mm, a compensation furnace and a rolling mill, wherein the exit temperature the thin slab from the continuous casting machine above 950 ° C is. Between the continuous casting machine and the equalization furnace is the Lowered the surface temperature of the slab to a sufficient depth, that a structural transformation of austenite into ferrite / pearlite occurs.
- the used cooling section is designed as a water cooling section and consists of several switchable and disconnectable chilled beams.
- the previously known method provides that by selecting the cooling intensity the temperature of the thin slab to a depth of at least 2 mm below the surface is lowered to below 600 ° C.
- the middle Surface temperature should be the Martensitschwelle the respective material quality do not fall short.
- the cooling time is chosen so that at least 70% Austenite can be converted into ferrite / perlite.
- WO 97/05971 A discloses as the closest prior art a process and a plant for the production of flat products, wherein the cooling section after the separator and immediately before the Ausgleirhsofen is arranged.
- the document DE 199 53 252 A1 discloses a method for surface treatment a continuously cast steel product and equipment for this purpose.
- a removal of surface defects and impurities to achieve is the surface processing step one Cooling at least a part of at least one surface of the metallic Products precede the defined temperature reduction to working surface.
- the document JP 11254115 A discloses a continuous casting process in which poured liquid steel from a funnel into a mold and from this one solidified strand is pulled out. After a bend in the horizontal position the strand is stretched and split between pinch rollers. The sections are immersed in a cooling water boiler to increase the surface texture The temperature of the cooling water is constantly monitored. Also the quality of the surface structure is observed and in a following Preheating oven corrected.
- Document JP 2000246411 A discloses a method for avoiding Cracking of a casting by targeted cooling. Austenitic crystal grain on the surface layer of the strand is before cooling Recrystallized by a forced cooling device and then provided in Length sections parts. Before further mechanical processing the strand is sprayed with high-pressure jets of a liquid coolant and then subjected to machining by rolling or hammering.
- the invention has the object underlying, a process for surface improvement of steel strands for all continuous casting formats, the independence from the casting speed offers and the "natural-tempering" with core heat of the cast strand avoids.
- the object of the invention is also a corresponding device provide.
- Another method embodiment provides that for intensive dissipation of heat from the cooling section this enclosed with a sheath and steam and residues of unvaporised cooling water forcibly subtracted from.
- the invention provides with advantage that the amount of water and water pressure controlled or regulated according to the current strand transport speed become. Due to the positioning of the cooling section downstream of the Separator is the dependence of the cooling distance on the speed lifted the casting process.
- This provides a further embodiment of the method according to the invention before that the distance between the puller and straightening machine and the Separating device for homogenizing the temperature different Strand areas, e.g. on edges or surfaces, is used.
- another embodiment of the method according to the invention provides before that the cooling section in a region of the strand guide with possible high temperature of the strand between the separator and the Equalization furnace is arranged.
- a plant for the production of flat or long products in a production plant for example, from thin slabs, thick slabs, from Knüppein, Blooms, Reliefvorprofilen or the like with a continuous caster, comprising a mold, a strand guide with a pull-out and straightening machine, a cooling section and a separation device for the cast strand and one of these downstream compensation furnace or Voricarmofen, in as possible small distance behind the cooling section and this in the least possible Distance is arranged behind the separator.
- the cooling section with equipped with a variety of high pressure water spray nozzles that the Casting strand surrounded on all sides.
- a mold 11 can be seen, which for continuous casting a cast strand 6 is formed.
- segments 12 to 14 of a strand guide 1 with a plurality of guide rollers are also possible.
- the pull-out and straightening machine 2 ensures a uniform separation and Transport of the strand 6. Behind it is in the transport direction, the separator 3 provided. It can be a pair of scissors or an autogenous cutting machine act. This is in relatively close distance arranged behind the pull-out and straightening machine 2.
- the invention with water spray nozzles 7 is equipped and enclosed by a housing 9.
- a suction device 10 with a powerful Exhaustor connected which is the resulting during quenching steam and the unused Wassersprühteilchen sucks and from the cooling section 4 forcibly deducted.
- a cooling of the surface layer 8 is achieved, the example. at least 2 mm.
- the compensation furnace or preheating furnace 5 is arranged at a close distance, wherein by external heat supply recrystallization of the microstructure in Direction perlite / ferrite is initiated. That for the surface quality of the cast strand Detrimental "natural quenching" is avoided in this way.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Metal Rolling (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Produktion von Flach- und 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 Trenneinrichtung für den Strang, sowie einen nachgeordneten Ausgleichsofen, wobei die Positionierung der Kühlstrecke stromabwärts hinter der Trenneinrichtung, bevorzugt in unmittelbarer Nähe des Ausgleichsofens oder Vorwärmofen, vorgenommen wird. Die Erfindung betrifft auch eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a process for the production of flat and long products in a production plant, for example from thin slabs, thick slabs, from billets, Blooms, Trägerervorprofilen or the like with a Continuous casting plant, comprising a mold, a strand guide with an extractor and leveler, a cooling section and a separator for the Strand, as well as a downstream equalization furnace, with the positioning the cooling section downstream behind the separator, preferably in the immediate Near the equalizing or preheating furnace. The The invention also relates to a device for carrying out 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.Method of the aforementioned type for improving the surface of steel strands have been known for some time reported here u.a. a publication in the magazine "FEATURE", August 1999, page 39, under the title: "Quenching for Improved Direct Hot Charging Quality ". that many steelmakers associated with direct hot-batching aluminum-tempered steel and, in the case of steel alloys, brittleness problems have, and that these by a precision cooling of the outer Shell of the steel strand dissolved immediately after the casting process can be.
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 Komgrenzen, 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 of the reasons for these problems rapid heating in direct hot-batching and rolling process. Aluminum nitrides are found in most aluminum-tempered steels. These are formed and precipitated at the austenitic grain boundaries, when the steel is the transformation phase from austenite to austenite plus ferrite passes. When the cast strand is then in a stove for reheating the rolling is introduced, the precipitates remain on the austenitic Grain limits, even if the steel is a phase change back to complete austenite. The excretion of aluminum nitride calls further problems with other precipitates such as copper, vanadium, among others, resulting in an extremely fragile microstructure. To solve the above problems, according to a teaching of the document EP 0 650 790 A1, proposes the following:
Es wird eine thermische Behandlung von Stahl mit Erzielung einer feinkörnigen Oberfläche zur Vermeidung des schädlichen Einflusses von Verbindungen der Elemente Al; V; Nb (sog. Minimierung des "Hot Shortness" Effektes) vorgesehen. Für eine Minimierung von Oberflächenfehlem sollen Oberflächenspannungen abgebaut werden.It will be a thermal treatment of steel with the achievement of a fine-grained Surface to avoid the harmful influence of compounds of Elements Al; V; Nb (so-called minimization of the "hot shortness" effect). To minimize surface defects, surface tensions should be used be reduced.
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 the "natural tempering", i. a reheating by contained in the block Residual heat desired The positioning of a quenching box is also immediate after the extraction and straightening machine and before the separator intended.
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 rolled strip. The corresponding production plant consists of a continuous caster for thin slabs between 40 and 70 mm, a compensation furnace and a rolling mill, wherein the exit temperature the thin slab from the continuous casting machine above 950 ° C is. Between the continuous casting machine and the equalization furnace is the Lowered the surface temperature of the slab to a sufficient depth, that a structural transformation of austenite into ferrite / pearlite occurs. The used cooling section is designed as a water cooling section and consists of several switchable and disconnectable chilled beams.
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.Preferably, the previously known method provides that by selecting the cooling intensity the temperature of the thin slab to a depth of at least 2 mm below the surface is lowered to below 600 ° C. The middle Surface temperature should be the Martensitschwelle the respective material quality do not fall short. The cooling time is chosen so that at least 70% Austenite can be converted into ferrite / perlite.
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 aluminium-beruhigten
Stählen das Auftreten von Oberflächenrissen effektiv unterdrückt
werden, selbst wenn die Stähle einen Anteil von 0,0080 bis 0,0300 Gewichtsprozent
von Nitrosen, und/oder von 0,03 bis 0,25 Gewichtsprozent Blei enthalten.
Das Verfahren umfasst die Schritte:
Das Dokument WO 97/05971 A offenbart als nächstliegenden Stand der Technik ein Verfahren sowie eine Anlage zur Produktion von Flachprodukten, wobei die Kühlstrecke nach der Trennvorrichtung und unmittelbar vor dem Ausgleirhsofen angeordnet ist.The document WO 97/05971 A discloses as the closest prior art a process and a plant for the production of flat products, wherein the cooling section after the separator and immediately before the Ausgleirhsofen is arranged.
Das Dokument DE 199 53 252 A1 offenbart ein Verfahren zur Oberflächenbearbeitung eines kontinuierlich gegossenen Stahlproduktes und Einrichtung hierzu. Um im warmen Zustand eine Beseitigung von Oberflächenfehlem und -verunreinigungen zu erreichen, soll dem Schritt der Oberflächenbearbeitung eine Kühlung mindestens eines Teils von mindestens einer Oberfläche des metallischen Produkts vorausgehen zur definierten Temperaturemiedrigung der zu bearbeitenden Fläche. The document DE 199 53 252 A1 discloses a method for surface treatment a continuously cast steel product and equipment for this purpose. In the warm state, a removal of surface defects and impurities to achieve, is the surface processing step one Cooling at least a part of at least one surface of the metallic Products precede the defined temperature reduction to working surface.
Das Dokument JP 11254115 A offenbart einen Stranggießprozess, bei dem flüssiger Stahl aus einem Trichter in eine Kokille gegossen und aus dieser ein erstarrter Strang ausgezogen wird. Nach einer Biegung in die horizontale Position wird der Strang zwischen Klemmrollen gestreckt und zerteilt. Die Abschnitte werden in einen Kühlwasser-Kessel getaucht, um die Oberflächenstruktur zu verfeinem, wobei die Temperatur des Kühlwassers laufend überwacht wird.. Ebenfalls wird die Güte der Oberflächenstruktur beobachtet und in einem folgenden Vorwärmofen korrigiert.The document JP 11254115 A discloses a continuous casting process in which poured liquid steel from a funnel into a mold and from this one solidified strand is pulled out. After a bend in the horizontal position the strand is stretched and split between pinch rollers. The sections are immersed in a cooling water boiler to increase the surface texture The temperature of the cooling water is constantly monitored. Also the quality of the surface structure is observed and in a following Preheating oven corrected.
Das Dokument JP 2000246411 A offenbart ein Verfahren zur Vermeidung von Rissbildung an einem Gussstrang durch gezielte Kühlung. Austenitisches Kristallkorn an der Oberflächenschicht des Stranges wird vor einer Abkühlung durch eine Vorrichtung zur Zwangskühlung rekristallisiert und dann in vorgesehene Längenabschnitte zerteilt. Vor der weiteren mechanischen Bearbeitung wird der Strang mit Hochdruckstrahlen eines flüssigen Kühlmittels besprüht und sodann einer Bearbeitung durch Walzen oder Hämmern unterworfen.Document JP 2000246411 A discloses a method for avoiding Cracking of a casting by targeted cooling. Austenitic crystal grain on the surface layer of the strand is before cooling Recrystallized by a forced cooling device and then provided in Length sections parts. Before further mechanical processing the strand is sprayed with high-pressure jets of a liquid coolant and then subjected to machining by rolling or hammering.
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. Aufgabe der Erfindung ist auch, eine entsprechende Vorrichtung bereitzustellen.Based on the aforementioned prior art, the invention has the object underlying, a process for surface improvement of steel strands for all continuous casting formats, the independence from the casting speed offers and the "natural-tempering" with core heat of the cast strand avoids. The object of the invention is also a corresponding device provide.
Zur Lösung der Aufgabe wird mit der Erfindung ein Verfahren gemäß dem Oberbegriff vom Anspruch 1 vorgeschlagen, welches dem Kennzeichnungsteil von Anspruch 1 entspricht.To solve the problem with the invention, a method according to the Preamble proposed by claim 1, which the identification part of claim 1 corresponds.
Mit der Erfindung ergeben sich u.a. folgende Vorteile:
- die Möglichkeit einer Minimierung der schädlichen Cu-Einflüsse bei Einsatz minderwertigen, preiswerteren Schrottes, wobei auch die schädlichen Effekte der vorgenannten Elemente Al, 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 tempering) 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 der Wassermenge und des Druckes ergibt sich hier die Möglichkeit einer Regelung der Strangtransportgeschwindigkeit.
- the possibility of minimizing the harmful effects of Cu when using inferior, cheaper scrap, whereby the harmful effects of the aforementioned elements Al, V, Nb and Pb are largely suppressed,
- due to the positioning behind the separator in the immediate vicinity of the preheating furnace of the rolling mill re-heating of the surface of the thin slab by own heat content (natural tempering) is avoided;
- in the proposed position of the quenching device can be achieved by shielding the strand before quenching a certain temperature compensation in the strand;
- the path from the leveling machine to the scissors can be used for temperature homogenization;
- a significant advantage in quenching after separation is the independence of the casting speed. In addition to controlling the amount of water and the pressure here is the possibility of regulating the strand transport speed.
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 method embodiment provides that for intensive dissipation of heat from the cooling section this enclosed with a sheath and steam and residues of unvaporised cooling water forcibly subtracted from.
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 Geschwindigkeit des Gießprozesses aufgehoben.Next, the invention provides with advantage that the amount of water and water pressure controlled or regulated according to the current strand transport speed become. Due to the positioning of the cooling section downstream of the Separator is the dependence of the cooling distance on the speed lifted the casting process.
Dabei sieht eine weitere Ausgestaltung des erfindungsgemäßen 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. This provides a further embodiment of the method according to the invention before that the distance between the puller and straightening machine and the Separating device for homogenizing the temperature different Strand areas, e.g. on edges or surfaces, is used.
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, another embodiment of the method according to the invention provides before that the cooling section in a region of the strand guide with possible high temperature of the strand between the separator and the Equalization furnace is arranged.
Bei einer Anlage zur Produktion von Flach- oder Langprodukten in einer Produktionsanlage, beispielsweise aus Dünnbrammen, Dickbrammen, aus Knüppein, 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, der in möglichst geringem Abstand hinter der Kühlstrecke und diese in möglichst geringem Abstand hinter der Trennvorrichtung angeordnet ist. Zur Durchführung des zuvor beschriebenen Verfahrens wird vorgeschlagen, dass die Kühlstrecke mit einer Vielzahl von Hochdruck-Wassersprühdüsen ausgestattet ist, die den Gussstrang allseitig umgeben.In a plant for the production of flat or long products in a production plant, for example, from thin slabs, thick slabs, from Knüppein, Blooms, Trägervorprofilen or the like with a continuous caster, comprising a mold, a strand guide with a pull-out and straightening machine, a cooling section and a separation device for the cast strand and one of these downstream compensation furnace or Vorwärmofen, in as possible small distance behind the cooling section and this in the least possible Distance is arranged behind the separator. To carry out the previously described method is proposed that the cooling section with equipped with a variety of high pressure water spray nozzles that the Casting strand surrounded on all sides.
Ausgestaltungen der Anlage ergeben sich aus den Unteransprüchen.Embodiments of the system will become apparent from the dependent claims.
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 will become apparent from the following Explanation of an embodiment shown purely schematically in Figure 1 clarified.
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 embodiment, a
Die Auszieh- und Richtmaschine 2 sorgt für einen gleichmäßigen Auszug und
Transport des Stranges 6. Dahinter ist in Transportrichtung die Trenneinrichtung
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 pull-out and straightening
In dichtem Abstand hinter der Trennvorrichtung 3 ist als besonderes Kennzeichen
der Erfindung eine Kühlstrecke 4 angeordnet, die mit Wassersprühdüsen
7 ausgestattet ist und von einem Gehäuse 9 umschlossen ist.At a close distance behind the
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 Kühlmittel.
Dadurch wird eine Kühlung der Oberflächenschicht 8 erreicht, die bspw.
mindestens 2 mm beträgt.On the housing 9 is a
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. Behind it, the compensation furnace or preheating
- 11
- Strangführungstrand guide
- 22
- Auszieh- und RichtmaschineExtracting and straightening machine
- 33
- Trennvorrichtungseparating device
- 44
- Kühlstreckecooling section
- 55
- Ausgleichsofen / VorwärmofenEqualization furnace / preheating furnace
- 66
- Strangstrand
- 77
- Wassersprühstrahlenwater spray
- 88th
- Oberflächenschicht des StrangesSurface layer of the strand
- 99
- Gehäusecasing
- 1010
- Exhaustorexhauster
- 1111
- Kokillemold
- 1212
- StrangführungssegmentStrand guide segment
- 1313
- StrangführungssegmentStrand guide segment
- 1414
- StrangführungssegmentStrand guide segment
Claims (8)
- A method for the production of flat and/or elongated products in a production facility, from thin slabs, thick slabs, billets, blooms, girder pre-profiles, or the like, using a continuous casting facility comprising a mold (11), a strand guide (1) having a drawing and aligning machine (2), a cooling line (4), and a cutting device (3) for the strand (6), as well as a downstream equalization furnace or pre-heating furnace (5), the cooling line (4) being positioned downstream after the cutting device (3), preferably in direct proximity to the equalization furnace or pre-heating furnace (5),
characterized in that the surface layer (8) of the strand (6) is quenched in the cooling line (4) using high-energy, high-pressure water spray jets (7) and restarting of this surface layer (8) via core heat of the strand (6) is preferably prevented by continued comparatively slight cooling. - The method according to Claim 1,
characterized in that, to intensively dissipate heat from the cooling line (4), it is enclosed by a jacket (9), and steam and residual unevaporated cooling water is positively withdrawn therefrom. - The method according to Claim 1 or 2,
characterized in that the quantity and pressure of the water is controlled and/or regulated in accordance with the current strand transport speed. - The method according to one or more of Claims 1 through 3,
characterized in that the line between the drawing and aligning machine (2) and the cutting device (3) is used for homogenization of the temperatures of different strand regions, e.g., on edges or surfaces. - The method according to one or more of Claims 1 through 4,
characterized in that the cooling line (4) is positioned in a region of the strand guide (1) having the highest possible temperature of the strand (6) between the cutting device (3) and the equalization furnace or pre-heating furnace (5). - A facility for the production of flat or elongated products in a production facility, from thin slabs, thick slabs, billets, blooms, girder pre-profiles, or the like, for example, having a continuous casting facility, comprising a mold (11), a strand guide (1) having a drawing and aligning machine (2), a cooling line (4), and a cutting device (3) for the cast strand (6), as well as a downstream equalization furnace or pre-heating furnace (5), which is positioned as close as possible after the cooling line (4), which in turn is positioned as close as possible after the cutting device (3),
characterized in that the cooling line (4) is equipped with multiple high-pressure water spray nozzles (7), which enclose the cast strand (6) on all sides. - The facility according to Claim 6,
characterized in that the cooling line (4) is enclosed by a housing (9), which is connected to a suction device (10), e.g., an exhauster. - The facility according to one of Claims 6 or 7,
characterized in that the drawing and aligning machine (2), the cutting device (3), and the cooling line (4) are positioned together inside an undivided insulating hood.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10138794A DE10138794A1 (en) | 2001-08-07 | 2001-08-07 | Process and plant for the production of flat and long products |
| DE10138794 | 2001-08-07 | ||
| PCT/EP2002/008711 WO2003013763A1 (en) | 2001-08-07 | 2002-08-05 | Method and installation for producing flat and elongated products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1414603A1 EP1414603A1 (en) | 2004-05-06 |
| EP1414603B1 true EP1414603B1 (en) | 2005-01-12 |
Family
ID=7694701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02794548A Expired - Lifetime EP1414603B1 (en) | 2001-08-07 | 2002-08-05 | Method and installation for producing flat and elongated products |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1414603B1 (en) |
| AT (1) | ATE286792T1 (en) |
| DE (2) | DE10138794A1 (en) |
| WO (1) | WO2003013763A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009048567A1 (en) | 2008-10-23 | 2010-05-12 | Sms Siemag Ag | Method for cooling a cast strand in a continuous casting plant having a secondary cooling device and a control unit for regulating temperature in the secondary cooling device, by cooling the cast strand in a strong cooling device |
| DE102009049897A1 (en) | 2009-10-20 | 2011-04-28 | Sms Siemag Ag | Method for continuous casting of a metal strip, which emerges from a mold and is subjected to processing operation, comprises adjusting a spraying element in related to the quantity to be discharged on cooling medium per time |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| UA89895C2 (en) * | 2006-01-11 | 2010-03-10 | Смс Зімаг Акцієнгезелльшафт | method and device for continuous casting |
| 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 |
| 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 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2001
- 2001-08-07 DE DE10138794A patent/DE10138794A1/en not_active Withdrawn
-
2002
- 2002-08-05 DE DE50202008T patent/DE50202008D1/en not_active Expired - Lifetime
- 2002-08-05 AT AT02794548T patent/ATE286792T1/en active
- 2002-08-05 WO PCT/EP2002/008711 patent/WO2003013763A1/en not_active Application Discontinuation
- 2002-08-05 EP EP02794548A patent/EP1414603B1/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009048567A1 (en) | 2008-10-23 | 2010-05-12 | Sms Siemag Ag | Method for cooling a cast strand in a continuous casting plant having a secondary cooling device and a control unit for regulating temperature in the secondary cooling device, by cooling the cast strand in a strong cooling device |
| DE102009048567B4 (en) | 2008-10-23 | 2022-07-21 | Sms Group Gmbh | Method and arrangement for cooling a cast strand in a continuous casting plant |
| DE102009049897A1 (en) | 2009-10-20 | 2011-04-28 | Sms Siemag Ag | Method for continuous casting of a metal strip, which emerges from a mold and is subjected to processing operation, comprises adjusting a spraying element in related to the quantity to be discharged on cooling medium per time |
| DE102009049897B4 (en) | 2009-10-20 | 2023-09-14 | Sms Group Gmbh | Method and device for continuously casting a metal strand |
Also Published As
| Publication number | Publication date |
|---|---|
| DE50202008D1 (en) | 2005-02-17 |
| WO2003013763A1 (en) | 2003-02-20 |
| DE10138794A1 (en) | 2003-02-27 |
| ATE286792T1 (en) | 2005-01-15 |
| EP1414603A1 (en) | 2004-05-06 |
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