EP2025432A1 - Method for creating steel long products through strand casting and rolling - Google Patents

Method for creating steel long products through strand casting and rolling Download PDF

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Publication number
EP2025432A1
EP2025432A1 EP07014841A EP07014841A EP2025432A1 EP 2025432 A1 EP2025432 A1 EP 2025432A1 EP 07014841 A EP07014841 A EP 07014841A EP 07014841 A EP07014841 A EP 07014841A EP 2025432 A1 EP2025432 A1 EP 2025432A1
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EP
European Patent Office
Prior art keywords
mold
strand
casting
steel
strands
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Granted
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EP07014841A
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German (de)
French (fr)
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EP2025432B2 (en
EP2025432B1 (en
Inventor
Franz Dr. Kawa
Adalbert Roehrig
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SMS Concast AG
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Concast AG
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Application filed by Concast AG filed Critical Concast AG
Priority to EP07014841.6A priority Critical patent/EP2025432B2/en
Priority to BRPI0814203A priority patent/BRPI0814203A8/en
Priority to JP2010517302A priority patent/JP2011504141A/en
Priority to PCT/EP2008/005864 priority patent/WO2009015782A2/en
Priority to US12/670,445 priority patent/US20100276111A1/en
Priority to CN200880100820.0A priority patent/CN102105244B/en
Priority to KR1020107000773A priority patent/KR20100038195A/en
Priority to CA2694755A priority patent/CA2694755C/en
Priority to RU2010107172/02A priority patent/RU2484921C2/en
Publication of EP2025432A1 publication Critical patent/EP2025432A1/en
Priority to ZA2010/00216A priority patent/ZA201000216B/en
Priority to JP2013166381A priority patent/JP5632942B2/en
Publication of EP2025432B1 publication Critical patent/EP2025432B1/en
Application granted granted Critical
Publication of EP2025432B2 publication Critical patent/EP2025432B2/en
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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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0406—Moulds with special profile
    • 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
    • B21B1/463—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 in a continuous process, i.e. the cast not being cut before rolling

Definitions

  • the invention relates to a process for the production of steel long products according to the preamble of claim 1 and a continuous casting mold for the process.
  • the minimum intake speed at the inlet of the rolling train should under no circumstances be less than 4.2 m / min in order not to thermally overload the rollers due to the long contact time with the rolling stock.
  • the billet at the inlet of the mill train should have a suitable temperature for rolling both at the surface and in the core (1150-1250 ° C).
  • the surface temperature should be distributed as homogeneously as possible.
  • the present invention has for its object to propose a method that allows a simpler plant configuration and a more cost-effective operation.
  • the billet and Vorblockstrlinde generated by rapid continuous casting can be fed directly to a rolling mill without additional heating.
  • the mold cavity of this Stranggiesskokillen has at the inlet end of the mold along a circumferential line of its cross section at least two peripheral portions which each limit a cross-sectional enlargement of the mold cavity relative to the corresponding peripheral portions of the mold cavity cross-section at the strand outlet end of the mold in the form of protrusions.
  • the arc heights of the bulges are reduced in strand running direction such that deforms during molding in the mold cavity strand shell during passage through the mold, and thereby a uniform cooling and shell growth or a homogeneous temperature distribution along the strand circumference is ensured, creating a direct introduction in the rolling mill permitting high continuous casting speed is possible.
  • the temperature conditions in G fauxstrang at the outlet of the casting plant for the introduction into the rolling mill suitable, if necessary, a temperature regulation can be provided, but no heating is necessary.
  • the circumferential line of an approximately circular mold cavity cross section on the pouring side is subdivided into at least three substantially equal circumferential sections and each of these peripheral sections exhibits on the pouring side the cross sectional enlargement of the mold cavity as a bulge.
  • the arc heights of the bulges are reduced on all peripheral sections in the strand direction at least along a partial length of the mold cavity.
  • the circumferential line of a polygonal, preferably quadrangular cavity section on the pouring side between all corners on peripheral portions with cross-sectional enlargements of the mold cavity in the form of protrusions and the heights of the bulges decrease in size on all peripheral portions in strand direction at least along a partial length of the mold cavity.
  • the inventive method for producing long-steel products in which the billets and Vorblockstrlinde generated in the continuous casting mold directly - fed without additional heating - a rolling train and there rolled into long products, allows a simple system configuration and a cost-effective operation.
  • Fig.1 schematically shows the structure of a known continuous casting 10 with a ladle 1, an intermediate vessel 2 (Tundish), cooled with water mold 3, and a Strandumlenk noticed 6 for the strand 5, which pulled by means of rollers 6 'and bent into the horizontal. Thereafter, the strand 5 according to the invention is fed directly to a rolling train 20, which has a plurality of rolling units 21 with rolling rolls 22, which is not shown in detail since such rolling trains 20 or rolling mills are known.
  • a mold cavity 3 'of this mold 3 has at the inlet end of the mold along a circumferential line of its cross section at least two peripheral portions, each having a cross-sectional enlargement of the mold cavity 3' relative to the corresponding peripheral portions of Form cavity gap at the strand outlet end of the mold 3 in the form of bulges limit, which is not illustrated in detail.
  • the continuous casting speed of the strand 5 is advantageously at least 4.2 m / min in order not to exceed the permissible contact time between the strand and the rolls at the inlet of the rolling train and thereby not to shorten their durability unreasonable.
  • the temperature conditions at the outlet of the continuous casting plant 10 for the introduction into the rolling train are precisely adapted so that the rolling of the strand can be carried out in an optimal manner. At most, however, a passive temperature compensation, without external energy supply can be made.
  • the mold cavity cross section of the continuous casting mold is essentially formed as a four-round format.
  • This four-round format is based on a square or rectangle, but it is provided in the corners with relatively large radii. Strand exit side, these radii in the corner regions are advantageously approximately 20 to 40 mm at a length or width of the mold cavity cross-section of 120 to 180 mm.
  • an edge rounding of about 25 mm and the continuous casting speed of at least 5.2 m / min and correspondingly in a four-round format of 180 mm an edge rounding of about 40 mm and casting speed of at least 4.2 m / min could be provided.
  • a sliding closure 15 is provided for the purpose of accurate inflow control of the molten steel to be poured into the mold.
  • a regulation of the fill level of the melt in the mold 3 is carried out as a function of the inlet speed in the first stand (so-called master-slave operation), for a control device 13 and a level gauge 14 are provided in the mold 3. This regulation is intended to achieve an approximately constant filling level in the mold.
  • a refractory dip tube attached to the inflow control element and protruding into the mold is advantageous, so that the bath surface in the mold is as smooth as possible.
  • the cast billet strands form essentially a four-round format and their fillet is selected according to the format such that, at a sufficiently high casting speed, a strand is produced having a temperature distribution required for rolling, which can be directly rolled without any active reheating, i. the cast strands are fed endlessly to the rolling train without being cut into pieces.

Abstract

The process for producing steel long products by continuous casting of high-grade steel to form billet and bloom strands (5) and subsequent rolling of the strands to form long products e.g. steel bar or wire, comprises casting a liquid steel in a continuous-casting permanent mold (3), and feeding the cast billet and bloom strands without subsequent heating directly to a roll train (20). The fed billet strands form a four-round format. The roundness is selected according to the format in such a manner that a strand is produced with temperature distribution for rolling in large casting speed. The process for producing steel long products by continuous casting of high-grade steel to form billet and bloom strands (5) and subsequent rolling of the strands to form long products e.g. steel bar or wire, comprises casting a liquid steel in a continuous-casting permanent mold (3), and feeding the cast billet and bloom strands without subsequent heating directly to a roll train (20). The fed billet strands form a four-round format. The roundness is selected according to the format in such a manner that a strand is produced with temperature distribution for rolling in large casting speed, and is directly rolled without active reheating. The fed billet strands are circularly formed. The continuous-casting mold forms a mold cavity that is open at both ends. The mold cavity at the mold end of the continuous-casting permanent mold has two peripheral sections along a peripheral line of its cross-section. The peripheral sections limit a cross-section increasing of the mold cavity with respect to the corresponding extent sections of the mold cavity-section at the strand end of the mold in the form of projections. The curve height of the projections is reduced in strand direction of travel smaller in such a manner that during the casting process, a casting outer shell formed in the mold cavity is deformed by the mold so that a fast and uniform cooling and/or a homogeneous temperature distribution is ensured along the strand extent. The strand casting speed is 4.2 m/min. A sliding gate (15) for exact regulation of the steel melt is present in the mold during draining of the upper intermediate vessel (2) formed in the mold, where a regulation of the level height of the melt takes place in the mold in dependence of the intake speed into the first roll stand of the roll train and is regulated by the regulating device. An independent claim is included for strand casting mold for producing steel long products by continuous casting of high-grade steel.

Description

Die Erfindung betrifft ein Verfahren zur Erzeugung von Stahl-Langprodukten gemäss dem Oberbegriff des Anspruches 1 sowie eine Stranggiesskokille für das Verfahren.The invention relates to a process for the production of steel long products according to the preamble of claim 1 and a continuous casting mold for the process.

Es ist bekannt, den beim Stranggiessen erzeugten Giessstrang zu einzelnen Knüppeln oder Vorblöcken zu schneiden, auf Raumtemperatur abzukühlen und dann in einem Walzwerk wiedererwärmt zu Stahlstab, Draht und anderen Stahl-Langprodukten zu verwalzen.It is known to cut the cast strand produced by continuous casting into individual billets or billets, to cool it to room temperature and then rewarmed in a rolling mill to steel rod, wire and other steel long products.

Bekannt ist auch die gegossenen Knüppeln heiss (ca. 600°C) in den Walzwerksofen zwecks Nacherwärmung vor dem anschliessenden Verwalzen einzusetzen.
Um Energie zu sparen und das Ausbringen zu erhöhen, wird seit langem nach Lösungen gesucht, wie man eine Stranggiessanlage und eine Walzstrasse, vorzugsweise eine Giessader und eine Walzader, direkt verbinden könnte.Also known is the cast billets hot (about 600 ° C) in the rolling mill furnace for the purpose of reheating before the subsequent rolling use.
In order to save energy and increase the output, solutions have long been sought, as one could directly connect a continuous casting and a rolling mill, preferably a casting ladder and a Walzader.

Dabei stellen die unterschiedlichen Durchsätze, Geschwindigkeiten und Temperaturen sowie Temperaturverteilungen (Strangguss-Oberfläche/Zentrum) am Auslauf der Giessanlage und am Einlauf der Walzstrasse die Hauptprobleme dar.The different flow rates, speeds and temperatures as well as temperature distributions (continuous casting surface / center) at the outlet of the casting plant and at the inlet of the rolling train represent the main problems.

Die minimale Einzugsgeschwindigkeit am Einlauf der Walzstrasse sollte keinesfalls unter 4.2 m/min liegen um die Walzen infolge der langen Kontaktzeit mit dem Walzgut nicht thermisch zu überlasten. Ausserdem soll der Knüppel am Einlauf der Walzstrasse eine für das Walzen geeignete Temperatur sowohl an der Oberfläche als auch im Kern (1150-1250°C) aufweisen. Insbesondere sollte die Oberflächentemperatur möglichst homogen verteilt sein.The minimum intake speed at the inlet of the rolling train should under no circumstances be less than 4.2 m / min in order not to thermally overload the rollers due to the long contact time with the rolling stock. In addition, the billet at the inlet of the mill train should have a suitable temperature for rolling both at the surface and in the core (1150-1250 ° C). In particular, the surface temperature should be distributed as homogeneously as possible.

Aus der EP-B1-0 761 327 ist ein Verfahren bekannt, bei dem der in einer Stranggiessmaschine erzeugte Giessstrang einer Temperaturhalte- und Vorerwärmungsvorrichtung zugeführt wird, wonach er in einer weiteren Temperaturausgleichs- und Schnellaufheizvorrichtung aufgeheizt wird, bevor er in die Walzstrasse eingeführt wird. Nachteilig dabei sind die relativ hohen Kosten für die Installation und für den Betrieb der Nacherwärmungseinrichtung.From the EP-B1-0 761 327 For example, a method is known in which the casting strand produced in a continuous casting machine is fed to a temperature-maintaining and preheating device, after which it is heated in a further temperature compensation and rapid-heating device before being introduced into the rolling train. Disadvantages are the relatively high costs for the installation and for the operation of the reheating device.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren vorzuschlagen, das eine einfachere Anlagekonfiguration und einen kostengünstigeren Betrieb ermöglicht.The present invention has for its object to propose a method that allows a simpler plant configuration and a more cost-effective operation.

Diese Aufgabe wird erfindungsgemäss durch ein Verfahren mit den Merkmalen des Anspruches 1 gelöst.This object is achieved according to the invention by a method having the features of claim 1.

Bevorzugte Weitergestaltungen des erfindungsgemässen Verfahrens sowie bevorzugte Stranggiesskokillen für das Verfahren bilden den Gegenstand der abhängigen Ansprüche.Preferred further developments of the method according to the invention as well as preferred continuous casting molds for the method form the subject matter of the dependent claims.

Es wurde überraschenderweise festgestellt, dass bei Verwendung von Stranggiesskokillen, wie sie aus der EP-B2-0 498 296 bekannt sind, die durch Schnell-Stranggiessen erzeugten Knüppel- und Vorblockstränge ohne zusätzliches Aufheizen direkt einer Walzstrasse zugeführt werden können. Der Formhohlraum dieser Stranggiesskokillen weist am eingiessseitigen Ende der Kokille entlang einer Umfangslinie seines Querschnittes mindestens zwei Umfangsabschnitte auf, die je eine Querschnittsvergrösserung des Formhohlraumes gegenüber den entsprechenden Umfangsabschnitten des Formhohlraumquerschnittes am strangaustrittseitigen Ende der Kokille in der Form von Ausbuchtungen begrenzen. Die Bogenhöhen der Ausbuchtungen verkleinern sich in Stranglaufrichtung derart, dass sich während des Giessbetriebes eine in Formhohlraum bildende Strangschale beim Durchlauf durch die Kokille verformt, und dadurch eine gleichmässige Kühlung und Schalenwachstum bzw. eine homogene Temperaturverteilung entlang des Strangumfanges gewährleistet wird, wodurch eine die direkte Einführung in die Walzstrasse erlaubende hohe Stranggiessgeschwindigkeit möglich ist. Auch sind die Temperaturverhältnisse im Giesstrang am Auslauf der Giessanlage für die Einführung in die Walzstrasse geeignet, allenfalls kann eine Temperaturregulierung vorgesehen sein, jedoch ist keine Aufheizung notwendig.It has surprisingly been found that when using continuous casting molds, as is known from the EP-B2-0 498 296 are known, the billet and Vorblockstränge generated by rapid continuous casting can be fed directly to a rolling mill without additional heating. The mold cavity of this Stranggiesskokillen has at the inlet end of the mold along a circumferential line of its cross section at least two peripheral portions which each limit a cross-sectional enlargement of the mold cavity relative to the corresponding peripheral portions of the mold cavity cross-section at the strand outlet end of the mold in the form of protrusions. The arc heights of the bulges are reduced in strand running direction such that deforms during molding in the mold cavity strand shell during passage through the mold, and thereby a uniform cooling and shell growth or a homogeneous temperature distribution along the strand circumference is ensured, creating a direct introduction in the rolling mill permitting high continuous casting speed is possible. Also, the temperature conditions in Gießstrang at the outlet of the casting plant for the introduction into the rolling mill suitable, if necessary, a temperature regulation can be provided, but no heating is necessary.

Es ist heute praktisch möglich, im Querschnitt vierkantige Stränge im Formatbereich 120-130 mm mit einer Geschwindigkeit von ca. 6m/min zu Giessen. Bei Kokillen-Querschnittsformen nach der EP-B2-0 498 296 ergibt sich ein Strang mit homogener Temperaturverteilung an der Oberfläche, ohne kalte Kanten, welche sonst induktiv oder mittels Gasbrenner vor der Walzstrasse hätten erwärmt werden müssen. Gleichzeitig werden bei diesem Format die giesstechnischen Vorteile eines Quadrat-Querschnitts gegenüber einem Rundquerschnitt (günstigeres Verhältnis Oberfläche/Volumen bei gleichem Metergewicht) weitgehend beibehalten.It is practically possible today to cast square-edged strands in the format range 120-130 mm at a speed of approximately 6 m / min. In mold cross-sectional shapes after the EP-B2-0 498 296 results in a strand with a homogeneous temperature distribution at the surface, without cold edges, which otherwise would have to be heated inductively or by means of gas burners in front of the rolling train. At the same time, the casting advantages of a square cross-section compared to a round cross-section (more favorable surface / volume ratio with the same weight per meter) are largely retained in this format.

Bei einer besonders bevorzugten Ausführungsform einer Stranggiesskokille für das erfindungsgemässe Verfahren ist die Umfangslinie eines etwa runden Formhohlraumquerschnittes auf der Eingiessseite in mindestens drei im wesentlichen gleich grosse Umfangsabschnitte unterteilt und jeder dieser Umfangsabschnitte weist auf der Eingiessseite die Querschnittsvergrösserung des Formhohlraumes als Ausbuchtung auf. Die Bogenhöhen der Ausbuchtungen verkleinern sich auf allen Umfangsabschnitten in Stranglaufrichtung mindestens entlang einer Teillänge des Formhohlraumes.In a particularly preferred embodiment of a continuous casting mold for the process according to the invention, the circumferential line of an approximately circular mold cavity cross section on the pouring side is subdivided into at least three substantially equal circumferential sections and each of these peripheral sections exhibits on the pouring side the cross sectional enlargement of the mold cavity as a bulge. The arc heights of the bulges are reduced on all peripheral sections in the strand direction at least along a partial length of the mold cavity.

Bei einer weiteren vorteilhaften Ausführungsform einer Stranggiesskokille für das erfindungsgemässe Verfahren weist die Umfangslinie eines polygonalen, vorzugsweise viereckigen Formhohlraumquerschnittes auf der Eingiessseite zwischen allen Ecken Umfangsabschnitte mit Querschnittsvergrösserungen des Formhohlraumes in der Form von Ausbuchtungen auf und die Bogenhöhen der Ausbuchtungen verkleinern sich auf allen Umfangsabschnitten in Stranglaufrichtung mindestens entlang einer Teillänge des Formhohlraumes.In a further advantageous embodiment of a continuous casting mold for the method according to the invention, the circumferential line of a polygonal, preferably quadrangular cavity section on the pouring side between all corners on peripheral portions with cross-sectional enlargements of the mold cavity in the form of protrusions and the heights of the bulges decrease in size on all peripheral portions in strand direction at least along a partial length of the mold cavity.

Das erfindungsgemässe Verfahren zur Erzeugung von Stahl-Langprodukten, bei welchem die in der Stranggiesskokille erzeugten Knüppel- und Vorblockstränge unmittelbar - ohne zusätzliches Aufheizen - einer Walzstrasse zugeführt und dort zu Langprodukten gewalzt werden, ermöglicht eine einfache Anlagekonfiguration sowie einen kostengünstigen Betrieb.The inventive method for producing long-steel products, in which the billets and Vorblockstränge generated in the continuous casting mold directly - fed without additional heating - a rolling train and there rolled into long products, allows a simple system configuration and a cost-effective operation.

Die Erfindung wird nachfolgend anhand der Zeichnung näher erläutert. Es zeigt rein schematisch:

Fig. 1
eine schematische Darstellung einer nach dem erfindungsgemässen Verfahren arbeitende Stranggiessanlage mit einer Walzstrasse.
The invention will be explained in more detail with reference to the drawing. It shows purely schematically:
Fig. 1
a schematic representation of a working according to the inventive continuous casting plant with a rolling train.

Fig.1 zeigt schematisch den Aufbau einer an sich bekannten Stranggiessanlage 10 mit einer Giesspfanne 1, einem Zwischengefäss 2 (Tundish), einer mit Wasser gekühlten Kokille 3, sowie einer Strangumlenkeinrichtung 6 für den Strang 5, der mittels Rollen 6' ausgezogen und in die Horizontale gebogen. Danach wird der Strang 5 erfindungsgemäss direkt einer Walzstrasse 20 zugeführt, welche mehrere Walzeinheiten 21 mit Walzrollen 22 aufweist, was nicht weiter im Detail dargetan ist, da solche Walzstrassen 20 bzw. Walzwerke bekannt sind. Fig.1 schematically shows the structure of a known continuous casting 10 with a ladle 1, an intermediate vessel 2 (Tundish), cooled with water mold 3, and a Strandumlenkeinrichtung 6 for the strand 5, which pulled by means of rollers 6 'and bent into the horizontal. Thereafter, the strand 5 according to the invention is fed directly to a rolling train 20, which has a plurality of rolling units 21 with rolling rolls 22, which is not shown in detail since such rolling trains 20 or rolling mills are known.

Ein Formhohlraum 3' dieser Kokille 3 weist am eingiessseitigen Ende der Kokille entlang einer Umfangslinie seines Querschnittes mindestens zwei Umfangsabschnitte auf, die je eine Querschnittsvergrösserung des Formhohlraumes 3' gegenüber den entsprechenden Umfangsabschnitten des Formhohlraumquerschnittes am strangaustrittseitigen Ende der Kokille 3 in der Form von Ausbuchtungen begrenzen, was nicht näher veranschaulicht ist.A mold cavity 3 'of this mold 3 has at the inlet end of the mold along a circumferential line of its cross section at least two peripheral portions, each having a cross-sectional enlargement of the mold cavity 3' relative to the corresponding peripheral portions of Form cavity gap at the strand outlet end of the mold 3 in the form of bulges limit, which is not illustrated in detail.

Die Stranggiessgeschwindigkeit des Stranges 5 beträgt vorteilhaft mindestens 4.2 m/min, um die zulässige Kontaktzeit zwischen Strang und der Walzen am Einlauf der Walzstrasse nicht zu überschreiten und dadurch deren Haltbarkeit nicht unzumutbar zu verkürzen.The continuous casting speed of the strand 5 is advantageously at least 4.2 m / min in order not to exceed the permissible contact time between the strand and the rolls at the inlet of the rolling train and thereby not to shorten their durability unreasonable.

Die Temperaturverhältnisse am Auslauf der Stranggiessanlage 10 für die Einführung in die Walzstrasse sind genau angepasst, damit das Walzen des Stranges in optimaler Weise erfolgen kann. Allenfalls kann jedoch ein passiver Temperaturausgleich, ohne Fremdenergiezufuhr vorgenommen werden.The temperature conditions at the outlet of the continuous casting plant 10 for the introduction into the rolling train are precisely adapted so that the rolling of the strand can be carried out in an optimal manner. At most, however, a passive temperature compensation, without external energy supply can be made.

Der Formhohlraumquerschnitt der Stranggiesskokille ist im Wesentlichen als Vierrundformat gebildet. Dieses Vierrundformat basiert auf einem Quadrat oder Rechteck, wobei es in den Eckbereichen jedoch mit relativ grossen Radien versehen ist. Strangaustrittseitig betragen diese Radien in den Eckbereichen vorteilhaft annähernd 20 bis 40 mm bei einer Länge bzw. Breite des Formhohlraumquerschnittes von 120 bis 180 mm.The mold cavity cross section of the continuous casting mold is essentially formed as a four-round format. This four-round format is based on a square or rectangle, but it is provided in the corners with relatively large radii. Strand exit side, these radii in the corner regions are advantageously approximately 20 to 40 mm at a length or width of the mold cavity cross-section of 120 to 180 mm.

Zum Beispiel könnte bei einem Vierrundformat 120 mm eine Kantenverrundung von ca. 25 mm sowie die Stranggiessgeschwindigkeit mind. 5.2 m/min und entsprechend bei einem Vierrundformat 180 mm eine Kantenverrundung von ca. 40 mm sowie Giessgeschwindigkeit von mindestens 4.2 m/min vorgesehen sein.For example, in the case of a four-round format 120 mm, an edge rounding of about 25 mm and the continuous casting speed of at least 5.2 m / min and correspondingly in a four-round format of 180 mm an edge rounding of about 40 mm and casting speed of at least 4.2 m / min could be provided.

Beim Ausguss 11 des oberhalb der Kokille 3 befindlichen Zwischengefässes 2 ist ein an sich herkömmliches Regelorgan, vorzugsweise ein Schiebeverschluss 15 zwecks genauer Zuflussregelung der abzugiessenden Stahlschmelze in die Kokille vorgesehen. Eine Regelung der Füllstandshöhe der Schmelze in der Kokille 3 erfolgt in Abhängigkeit der Einlaufgeschwindigkeit im ersten Walzgerüst (sog. Master-Slave Betrieb), dafür eine Regeleinrichtung 13 und ein Füllstandsmessgerät 14 bei der Kokille 3 vorgesehen sind. Mit dieser Regelung soll eine annähernd konstante Füllhöhe in der Kokille erzielt werden. Vorteilhaft ist zudem ein am Zuflussregelorgan befestigtes und in die Kokille ragendes feuerfestes Tauchrohr vorhanden, damit sich eine möglichst ruhige Badoberfläche in der Kokille ergibt.When spout 11 located above the mold 3 intermediate vessel 2 is a conventional control device itself, preferably a sliding closure 15 is provided for the purpose of accurate inflow control of the molten steel to be poured into the mold. A regulation of the fill level of the melt in the mold 3 is carried out as a function of the inlet speed in the first stand (so-called master-slave operation), for a control device 13 and a level gauge 14 are provided in the mold 3. This regulation is intended to achieve an approximately constant filling level in the mold. In addition, a refractory dip tube attached to the inflow control element and protruding into the mold is advantageous, so that the bath surface in the mold is as smooth as possible.

Die gegossenen Knüppelstränge bilden im Wesentlichen ein Vierrund-Format und deren Verrundung entsprechend dem Format so gewählt wird, dass bei ausreichend grosser Giessgeschwindigkeit ein Strang mit für das Walzen erforderlicher Temperaturverteilung produziert wird, welches ohne jeglicher aktiver Nacherwärmung direkt verwalzt werden kann, d.h. die gegossenen Stränge werden endlos, ohne in Stücke geteilt zu werden, der Walzstrasse zugeführt.The cast billet strands form essentially a four-round format and their fillet is selected according to the format such that, at a sufficiently high casting speed, a strand is produced having a temperature distribution required for rolling, which can be directly rolled without any active reheating, i. the cast strands are fed endlessly to the rolling train without being cut into pieces.

Claims (12)

Verfahren zur Erzeugung von Stahl-Langprodukten durch Stranggiessen von Stahl zu Knüppelsträngen und anschliessendes Walzen dieser Knüppelstränge und Vorblockstränge zu den Langprodukten, wie Stabstahl oder Draht, wobei der Flüssigstahl in eine Stranggiesskokille gegossen wird, dadurch gekennzeichnet, dass
die gegossenen Knüppelstränge direkt einer Walzstrasse im Wesentlichen ohne Nacherwärmung zugeführt werden.Process for the production of steel long products by continuous casting of steel into billet strands and subsequent rolling of these billet strands and billet strands to the long products, such as bar steel or wire, wherein the liquid steel is poured into a continuous casting mold, characterized in that
the cast billet strands are fed directly to a rolling train substantially without reheating. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die gegossenen Knüppelstränge im Wesentlichen ein Vierrund-Format bilden.A method according to claim 1, characterized in that the cast billet strands form substantially a four-round format. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die Verrundung beim Vierrund-Format entsprechend dem Format so gewählt wird, dass bei ausreichend grosser Giessgeschwindigkeit ein Strang mit für das Walzen erforderlicher Temperaturverteilung produziert wird, welches ohne jegliche aktive Nacherwärmung direkt verwalzt werden kannA method according to claim 2, characterized in that the rounding in four-round format is selected according to the format so that at sufficiently high casting speed, a strand is produced with required for the rolling temperature distribution, which can be directly rolled without any active reheating Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die gegossenen Knüppelstränge im Wesentlichen kreisrund ausgebildet sind.A method according to claim 1, characterized in that the cast billet strands are formed substantially circular. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Stranggiesskokille einen beidseitig offenen Formhohlraum bildet, wobei der Formhohlraum am eingiessseitigen Ende der Stranggiesskokille entlang einer Umfangslinie seines Querschnittes mindestens zwei Umfangsabschnitte aufweist, die je eine Querschnittsvergrösserung des Formhohlraumes gegenüber den entsprechenden Umfangsabschnitten des Formhohlraumquerschnittes am strangaustrittseitigen Ende der Kokille in der Form von Ausbuchtungen begrenzen, und sich Bogenhöhen der Ausbuchtungen in Stranglaufrichtung derart verkleinern, dass sich während des Giessbetriebes eine in Formhohlraum bildende Strangschale beim Durchlauf durch die Kokille verformt und dadurch eine schnelle und gleichmässige Kühlung bzw. eine homogene Temperaturverteilung entlang des Strangumfanges gewährleistet wird.Method according to one of the preceding claims 1 to 4, characterized in that the continuous casting mold forms a mold cavity open on both sides, wherein the mold cavity at the inflow end of the continuous casting mold along a circumferential line of its cross section has at least two peripheral portions, each having a cross-sectional enlargement of the mold cavity relative to the corresponding peripheral portions of the mold cavity cross-section at the strand outlet end of the mold in the form of bulges limit, and reduce sheet heights of the bulges in strand direction so that deforms during casting process forming a mold cavity strand shell as it passes through the mold and thereby rapid and uniform cooling or a homogeneous temperature distribution along the circumference of the strand is ensured. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Stranggiessgeschwindigkeit mindestens 4.2 m/min beträgt.Method according to one of the preceding claims 1 to 5, characterized in that the continuous casting speed is at least 4.2 m / min. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 6, dadurch gekennzeichnet, dass beim Ausguss des oberhalb der Kokille befindlichen Zwischengefässes ein Regelorgan, vorzugsweise ein Schiebeverschluss, zwecks genauer Regelung der abzugiessenden Stahlschmelze in die Kokille vorhanden ist, wobei eine Regelung der Füllstandshöhe der Schmelze in der Kokille in Abhängigkeit der Einlaufgeschwindigkeit in das erste Walzgerüst der Walzstrasse erfolgt und das Regelorgan entsprechend geregelt wird.Method according to one of the preceding claims 1 to 6, characterized in that the spout located above the mold Intermediate vessel a control element, preferably a sliding closure, for the purpose of precise control of the molten steel to be poured into the mold is present, with a level control of the level of the melt in the mold depending on the feed rate in the first stand of the rolling mill and the control element is controlled accordingly. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 7, dadurch gekennzeichnet, dass Massen- bzw. Betonstähle verwendet werden.Method according to one of the preceding claims 1 to 7, characterized in that mass or reinforcing steels are used. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 7, dadurch gekennzeichnet, dass Qualitätsstahl verwendet wird.Method according to one of the preceding claims 1 to 7, characterized in that quality steel is used. Stranggiesskokille für das Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Umfangslinie eines polygonalen, vorzugsweise viereckigen Formhohlraumquerschnittes auf der Eingiessseite zwischen allen Ecken Umfangsabschnitte mit Querschnittsvergrösserungen des Formhohlraumes in der Form von Ausbuchtungen aufweist und die Bogenhöhen der Ausbuchtungen sich auf allen Umfangsabschnitten in Stranglaufrichtung mindestens entlang einer Teillänge des Formhohlraumes verkleinern.Continuous casting mold for the method according to one of claims 1 to 9, characterized in that the peripheral line of a polygonal, preferably quadrangular cavity section on the pouring side between all corners peripheral portions having cross-sectional enlargements of the mold cavity in the form of bulges and the arc heights of the bulges on all peripheral portions shrink in strand direction at least along a partial length of the mold cavity. Stranggiesskokille nach Anspruch 10, dadurch gekennzeichnet, dass der Formhohlraumquerschnitt der Stranggiesskokille im Wesentlichen ein Vierrundformat bildet, welches an sich quadratisch bzw. rechteckig ausgebildet ist, in den Eckbereichen jedoch mit Radien versehen ist.Continuous casting mold according to claim 10, characterized in that the mold cavity cross section of the continuous casting mold essentially forms a four-round format, which is square or rectangular in itself, but is provided with radii in the corner regions. Stranggiesskokille nach Anspruch 11, dadurch gekennzeichnet, dass bei der Stranggiesskokille strangaustrittseitig die Radien in den Eckbereichen annähernd 20 bis 40 mm bei einer Dicke bzw. Breite des Formhohlraumquerschnittes von 120 bis 180 mm betragen.Continuous casting mold according to claim 11, characterized in that in the continuous casting mold strand side on the radii in the corner regions approximately 20 to 40 mm with a thickness or width of the mold cavity cross-section of 120 to 180 mm.
EP07014841.6A 2007-07-27 2007-07-27 Method for creating steel long products through strand casting and rolling Active EP2025432B2 (en)

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EP07014841.6A EP2025432B2 (en) 2007-07-27 2007-07-27 Method for creating steel long products through strand casting and rolling
KR1020107000773A KR20100038195A (en) 2007-07-27 2008-07-17 Process for producing steel long products by continuous casting and rolling
RU2010107172/02A RU2484921C2 (en) 2007-07-27 2008-07-17 Method of producing long-length rolled stock by continuous casting and rolling
PCT/EP2008/005864 WO2009015782A2 (en) 2007-07-27 2008-07-17 Process for producing steel long products by continuous casting and rolling
US12/670,445 US20100276111A1 (en) 2007-07-27 2008-07-17 Process for Producing Steel Long Products by Continuous Casting and Rolling
CN200880100820.0A CN102105244B (en) 2007-07-27 2008-07-17 By the method for continuous casting and rolling for the production of steel long products
BRPI0814203A BRPI0814203A8 (en) 2007-07-27 2008-07-17 process for producing long steel products through continuous casting and rolling
CA2694755A CA2694755C (en) 2007-07-27 2008-07-17 Process for producing steel long products by continuous casting and rolling
JP2010517302A JP2011504141A (en) 2007-07-27 2008-07-17 Method for producing long steel products by continuous casting and rolling
ZA2010/00216A ZA201000216B (en) 2007-07-27 2010-01-12 Process for producing steel long products by continuous casting and rolling
JP2013166381A JP5632942B2 (en) 2007-07-27 2013-08-09 Method for producing long steel products by continuous casting and rolling

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EP2025432B2 (en) 2017-08-30
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WO2009015782A3 (en) 2009-05-28
CN102105244B (en) 2015-09-09
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KR20100038195A (en) 2010-04-13
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CA2694755C (en) 2015-02-24
ZA201000216B (en) 2011-04-28
RU2010107172A (en) 2011-09-10
BRPI0814203A2 (en) 2015-01-27
US20100276111A1 (en) 2010-11-04
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JP2011504141A (en) 2011-02-03
CN102105244A (en) 2011-06-22

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