EP0841995A1 - High-speed thin-slabbing plant - Google Patents

High-speed thin-slabbing plant

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Publication number
EP0841995A1
EP0841995A1 EP96928327A EP96928327A EP0841995A1 EP 0841995 A1 EP0841995 A1 EP 0841995A1 EP 96928327 A EP96928327 A EP 96928327A EP 96928327 A EP96928327 A EP 96928327A EP 0841995 A1 EP0841995 A1 EP 0841995A1
Authority
EP
European Patent Office
Prior art keywords
strip
plant
casting
continuous casting
continuous
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
EP96928327A
Other languages
German (de)
French (fr)
Other versions
EP0841995B1 (en
Inventor
Fritz-Peter Pleschiutschnigg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
Mannesmann AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of EP0841995A1 publication Critical patent/EP0841995A1/en
Application granted granted Critical
Publication of EP0841995B1 publication Critical patent/EP0841995B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B21B1/466—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 non-continuous process, i.e. the cast being cut before rolling
    • 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
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B1/30—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 plates, strips, bands or sheets of indefinite length in a non-continuous process
    • B21B1/32—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 plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B21B1/34—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 plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by hot-rolling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/51—Plural diverse manufacturing apparatus including means for metal shaping or assembling
    • Y10T29/5184—Casting and working

Definitions

  • the invention relates to a plant for the production of hot-rolled steel strip from strip-shaped continuously cast starting material in successive working steps, in which the solidified pre-material is divided into preliminary strip lengths by means of a strand subsystem and after descaling the surface, in one
  • Compensating furnace brought to homogeneous rolling temperature, pre-rolled in at least two passes in a first rolling mill used as a roughing mill and, after being temporarily stored in winding and unwinding stations arranged in front of the finishing mill, is fed to the finishing mill for rolling out to finished strip thickness after upstream descaling.
  • the object of the present invention is to find a generic system, consisting of the continuous casting stage and the rolling stage, which has a minimal investment at max. Productivity and minimal conversion costs while at the same time ensuring strip thicknesses of up to 1 mm, or which is in a first approximation in a capacity balance to the Kontifertigstrasse.
  • a cooling or insulating section provided between the continuous casting plant and the compensating furnace for the strip-shaped primary material and a transverse transport furnace of approx. 45 m length and approx. 5 to 20 m width arranged downstream of the strand part arrangement and upstream of the preliminary mill.
  • the invention enables by combining the features of the main claim with only one continuous caster - while ensuring a min. Rolling effort and a min. Hot strip thickness from 1.0 to 0.8 mm - to fully utilize the rolling mill equipment with a capacity of 2 - 2.5 million tpa.
  • This solution is further characterized in that the slabs can be introduced into the compensating furnace (transverse transport furnace) with sufficient heat content.
  • the furnace then only has the task of equalizing the temperature of the slab and, if necessary, making it possible to buffer the slabs between the continuous casting stage and the rolling mill stage.
  • Buffering (dwell time) of the slabs in the furnace may be necessary for reasons of production disruption or for technical reasons and / or affect the internal structure (e.g. grain formation).
  • the furnace is therefore operated in an energy-neutral manner, the only energy to be supplied to the furnace is that it loses due to its radiation losses (e.g. 0.5 KW / m2).
  • This energy can be supplied both by burners and by a higher slab heat content, as is required for the rolling, in the latter case e.g. the oven also works as a type of cooling unit.
  • the heat content of the slab can be influenced by spray cooling and / or a controlled coverable roller table or an intermediate buffer.
  • the concave shape of the broad sides of the mold and / or the strand guide and / or by means of elements which guide and center the slab laterally over its narrow sides in the strand guide ensures that the strand runs in a straight line, which ensures casting reliability, particularly in the area of the mold, at a high level Casting speed from 4 to 8 m / min. guaranteed.
  • the described invention brings the advantage of a thicker Schiackenfilm section between the strand shell and the mold wall, which also makes the casting of crack-sensitive steel grades easier.
  • Fig. 2 in a table the residence times of the slabs of different thicknesses between the continuous caster and the furnace inlet.
  • the required annual capacity of 2 - 2.5 million tpa is represented with just one continuous caster.
  • This continuous caster is characterized by a
  • Continuous casting mold 1 with a thickness of 140 - 90 mm and a concavity per broadside between 30 and 3 mm, a pliers segment 2 for reducing the strand thickness to min. 90mm and / or a strand guide and centering with the help of concave roller profiles in the strand guide and / or lateral elements, a solidification thickness of 90 -125 mm.
  • This continuous caster can with no significant casting disruption
  • the strand S emerging from the casting plant can, after setting the required heat content for the later necessary rolling process, in the
  • Temperature compensation furnace 6 run in, which can also serve as a buffer. This temperature compensation furnace 6 is dimensioned in its length (max. 45 m) so that a spec. Coil weight of max. 25 kg / mm can be generated. After the temperature has been equalized, the slab B either enters the tandem roughing mill 8.9 with strand thicknesses ⁇ 90 mm or with another "layout"
  • Reversing stand 16 for strand thicknesses ⁇ 125 mm. In both cases the slab B is rolled to an intermediate thickness of 15 mm. This intermediate thickness is achieved either with the tandem roughing mill 8.9 in 2 passes or with the 1-stand reversing stand 16 in 3 passes.
  • the intermediate band Z produced for example 15 mm, is interwound and fed to the 4-5-stand finishing mill 13 with an upstream descaling 12.
  • a retraction speed of, for example, 0.8 m / see. into the 1st scaffolding of the finishing train 13, which prevents new scaling, and leaves the 5th scaffolding the finishing train 13 with a thickness of 1 mm and an exit speed of 12 m / see.
  • the Auslaufroligang 14 is characterized by a particularly small rolling and thus roller spacing in order to guide the thin strips well and to avoid lifting the strip.
  • a reel just behind the last finishing stand (5-15mm) with upstream belt cooling is possible
  • the thin hot strips produced in this way can replace a large part of the cold rolled strips on the market and thus also enable a great cost and energy advantage over the normal production lines.
  • Fig. 2 shows in table form the dwell times of the slabs B of different thicknesses between the continuous caster 1, 2 and the inlet into the equalizing furnace 6, which are necessary for the slab B to have the required heat content for the rolling stage when entering the equalizing furnace 6 via radiation having.
  • This max. Residence time can also be shortened by water cooling 5 or by a roller table cover 5a, e.g. in the case of low continuous casting speeds of 4m / min. be extended.
  • Mold thickness solidification thickness or B 75 mm strand thickness in the mold
  • Mold thickness solidification thickness or C 50 mm strand thickness in the mold
  • plants A and B are up for discussion. In case A, one plant is sufficient for the utilization of a finishing train with 25 approx. 2.5 million tpa, in case B two plants are required for the utilization of the finishing train.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Artificial Fish Reefs (AREA)
  • Glass Compositions (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Laminated Bodies (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Continuous Casting (AREA)

Abstract

The invention pertains to a plant to produce hot-rolled steel strip from a band of continuous cast input stock in a sequence of process steps, characterized by a continuous casting plant with a continuous casting and rolling unit with a casting speed of 4-8 m/min and a solidification thickness of 90-125 mm, using an oscillating continuous casting die with concavity between cast level and die outlet and/or a casting guide with concavity and/or with centering and guide elements in the continuous casting stand in the region of their narrow sides for purposes of guiding and centering the slab. A cooling and insulating section is provided between continuous casting plant and soaking furnace for the input stock strip and a crossover furnace of about 45 m in length and about 5 to 20 m in width, downstream of the continuous casting plant and upstream of the blooming mill.

Description

Hochgeschwindigkeits-DünnbrammenanlageHigh-speed thin slab plant
Beschreibungdescription
Die Erfindung betrifft eine Anlage zur Herstellung von warmgewalztem Stahlband aus bandförmig stranggegossenem Vormaterial in aufeinanderfolgenden Arbeitsschritten, in der das erstarrte Vormateriai mittels einer Strangteilanlage in Vorbandlängen aufgeteilt und nach dem Entzundern der Oberfläche, in einemThe invention relates to a plant for the production of hot-rolled steel strip from strip-shaped continuously cast starting material in successive working steps, in which the solidified pre-material is divided into preliminary strip lengths by means of a strand subsystem and after descaling the surface, in one
Ausgleichsofen auf homogene Walztemperatur gebracht, in einem ersten als Vorstraße eingesetzten Walzwerk in mindestens zwei Walzstichen vorgewalzt und nach Zwischenspeicherung in vor der Fertigstraße angeordneten Auf- und Abwickelstationen nach vorgeschalteter Entzunderung der Fertigstraße zum Auswalzen auf Fertigbanddicke zugeführt wird.Compensating furnace brought to homogeneous rolling temperature, pre-rolled in at least two passes in a first rolling mill used as a roughing mill and, after being temporarily stored in winding and unwinding stations arranged in front of the finishing mill, is fed to the finishing mill for rolling out to finished strip thickness after upstream descaling.
Eine solche Anlage ist in der nicht vorveröffentlichten DE 195 12 953.9 beschrieben.Such a system is described in the unpublished DE 195 12 953.9.
Die bisher auf dem Markt bekannten Anlagen zur Erzeugung von Warmband aus dünnen Bramme müssen bzw. müßten mindestens 2 Stranggießanlagen aufweisen, um eine Gleichgewichts-Kapazität zum Konti-Warmwalzwerk von ca. 2 - 2, 5 mio. tpa und damit eine Maximierung der Produktivität realisieren zu können.The systems known to date for the production of hot strip from thin slabs must or should have at least 2 continuous casting systems in order to have an equilibrium capacity for the continuous hot rolling mill of approximately 2-2.5 million. tpa and thus maximizing productivity.
Diese Stranggießanlagen werden mit einer Gießgeschwindigkeit von 5 bis 6 m/min mit hoher Betriebssicherheit betrieben und weisen bei einer Dicke im Gießspiegel von 50 - 80 mm eine Erstarrungsdicke von 60 bis 43 mm auf. Andererseits werden klassische Stranggießanlagen der beispielhaften Abmessung von 1600 x 200 mm mit max. 2 m/min. gegossen. Hierbei zeichnet sich aber in der betrieblichen Praxis eine Durchschnittsgießgeschwindigkeit von 1 ,6 bis 1 ,8 m/min ab, da bei höherer Gießgeschwindigkeit die Gießsicherheit wegen der Durchbruchgefahr gefährdet ist.These continuous casting plants are operated at a casting speed of 5 to 6 m / min with a high level of operational safety and have a solidification thickness of 60 to 43 mm with a thickness in the casting level of 50 - 80 mm. On the other hand, classic continuous casting plants of the exemplary dimensions of 1600 x 200 mm with max. 2 m / min. poured. Here, however, an average casting speed of 1.6 to 1.8 m / min is apparent in operational practice, since at higher casting speeds the casting safety is endangered because of the risk of breakthrough.
Aufgabe der vorliegenden Erfindung ist es, eine gattungsgemäße Anlage, bestehend aus der Stranggießstufe und Walzstufe, zu finden, die einen minimalem Investitionsaufwand bei max. Produktivität und minimalen Umwandlungskosten bei gleichzeitiger Sicherstellung Banddicken bis 1 mm erzielt, bzw. die in erster Näherung in einem Kapazitätsgleichgewicht zur Kontifertigstraße steht.The object of the present invention is to find a generic system, consisting of the continuous casting stage and the rolling stage, which has a minimal investment at max. Productivity and minimal conversion costs while at the same time ensuring strip thicknesses of up to 1 mm, or which is in a first approximation in a capacity balance to the Kontifertigstrasse.
Dies wird erreicht durch einen minimalen Walzaufwand bei Sicherstellung eines Prozesses, der keine Zufuhr von fühlbarer Wärme von außen erfordert und nur eine minimale Investition benötigt. Eine solche Lösung konnte überraschenderweise durch die Zusammenführung folgender Anlagenmerkmale gefunden werden:This is achieved through a minimal rolling effort while ensuring a process that does not require the supply of sensible heat from the outside and requires only a minimal investment. Such a solution was surprisingly found by combining the following system features:
Eine Stranggießanlage mit einer Gießwalzeinrichtung zum Herstellen des bandförmigen Vormaterials mit einer Gießgeschwindigkeit von 4-8 m/min und einer Erstarrungsdicke von 90-125 mm unter Verwendung einer oszillierenden, hydraulisch angetriebenen Stranggießkokille mit Konkavität zwischen Gießspiegel und Kokillenaustritt und/oder einer Strangführung mit Konkavität und/oder mit Zentrierungs- und Führungselementen im Strangführungsgerüst imA continuous caster with a casting roller device for producing the strip-shaped primary material with a casting speed of 4-8 m / min and a solidification thickness of 90-125 mm using an oscillating, hydraulically driven continuous casting mold with concavity between the casting level and the mold outlet and / or a strand guide with concavity and / or with centering and guide elements in the strand guide frame in the
Bereich ihrer Schmalseiten zum Führen und Zentrieren der Bramme, eine zwischen Stranggießanlage und Ausgleichsofen vorgesehener Kühl- bzw. Isolierstrecke für das bandförmige Vormaterial und einen der Strangteilaniage nachgeordneten und der Vorstraße vorgeordneten Quertransportofen von ca. 45m Länge und ca. 5 bis 20m Breite.Area of their narrow sides for guiding and centering the slab, a cooling or insulating section provided between the continuous casting plant and the compensating furnace for the strip-shaped primary material and a transverse transport furnace of approx. 45 m length and approx. 5 to 20 m width arranged downstream of the strand part arrangement and upstream of the preliminary mill.
Günstige Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben. Die Erfindung ermöglicht durch die Zusammenführung der Merkmale des Hauptanspruches mit nur einer Stranggießanlage -bei gleichzeitiger Sicherstellung eines min. Walzaufwands und einer min. Warmbandenddicke von 1 ,0 bis 0,8 mm- die Walzwerkseinrichtung mit einer Kapazität von 2 - 2,5 mio tpa völlig auszulasten.Favorable embodiments of the invention are specified in the subclaims. The invention enables by combining the features of the main claim with only one continuous caster - while ensuring a min. Rolling effort and a min. Hot strip thickness from 1.0 to 0.8 mm - to fully utilize the rolling mill equipment with a capacity of 2 - 2.5 million tpa.
Weiterhin zeichnet sich diese Lösung dadurch aus, daß die Brammen mit einem ausreichender Wärmeinhalt in den Ausgleichsofen (Quertransportofen) eingebracht werden können. Der Ofen hat dann nur die Aufgabe, die Temperatur der Bramme auszugleichen und wenn notwendig eine Pufferung der Brammen zwischen Stranggießstufe und Walzwerkstufe möglich zumachen.This solution is further characterized in that the slabs can be introduced into the compensating furnace (transverse transport furnace) with sufficient heat content. The furnace then only has the task of equalizing the temperature of the slab and, if necessary, making it possible to buffer the slabs between the continuous casting stage and the rolling mill stage.
Eine Pufferung (Verweilzeit) der Brammen im Ofen kann aus Gründen der Produktionsstörung oder aus werkstomechnischer Gründen notwendig werden und/oder die Innenstruktur (z.B. Kornausbildung) beeinflussen.Buffering (dwell time) of the slabs in the furnace may be necessary for reasons of production disruption or for technical reasons and / or affect the internal structure (e.g. grain formation).
Der Ofen wird demnach energieneutral betrieben, dem Ofen ist lediglich die Energie zuzuführen, die er über seine Strahlungsverluste (z.B. 0,5 KW/m2) verliert. Diese Energie kann sowohl durch Brenner als auch durch einer höheren Brammen-Wärmeinhalt, wie er für die Walzung benötigt wird, zugeführt werden, im letzteren Fall z.B. arbeitet der Ofen auch als eine Art von Kühlaggregat.The furnace is therefore operated in an energy-neutral manner, the only energy to be supplied to the furnace is that it loses due to its radiation losses (e.g. 0.5 KW / m2). This energy can be supplied both by burners and by a higher slab heat content, as is required for the rolling, in the latter case e.g. the oven also works as a type of cooling unit.
Um die Bramme mit dem gewünschten Energieinhalt in den Ofen einlaufen zu lassen, so daß der Ofen nur als Ausgieichsofen arbeitet, sollte zwischen Stranggießanlage und Ofeneintritt eine Kühlmöglichkeit bzw.In order to allow the slab to enter the furnace with the desired energy content, so that the furnace only works as a compensating furnace, there should be a cooling option between the continuous caster and the furnace inlet.
Isolationsmöglichkeit vorgesehen sein. Die Beeinflussung des Wärmeinhalts der Bramme kann durch eine Spritzkühlung und/oder einem kontrolliert abdeckbaren Rollgang oder einem Zwischenpuffer realisiert werden.Insulation possibility may be provided. The heat content of the slab can be influenced by spray cooling and / or a controlled coverable roller table or an intermediate buffer.
Nach Austritt der Bramme aus dem Ofen wird sie in einer Tandem-Vorstraße mitAfter the slab has left the furnace, it is transported in a tandem roughing mill
2 Stichen oder einer eingerüstigen Reversier-Vorstraße in 3 Stichen, auf 25-10 mm gewalzt, um nach einer Zwischenwicklung in einer 4 oder 5 gerüstigen Fertigstraße bis zu minimal 0,8 -1 ,0 mm Warmband fertiggewalzt zu werden. Diese Lösung weist eine hohe Betriebssicherheit auf, da der Strang in Relation zur Dünnbramme mit einer Dicke in der Kokille von z.B. 50mm eine 2 - 6 fach höhere Schlackenverfügbarkeit aufweist, die zu einem entsprechend geringeren Wärmedurchgang und geringerer Thermobelastung sowohl der Strangschale als auch der Kokillenplatten führt.2 stitches or a single-stand reversing roughing mill in 3 stitches, rolled to 25-10 mm in order to be rolled to a minimum of 0.8-1.0 mm hot strip after an intermediate winding in a 4 or 5-stand finishing train. This solution has a high level of operational reliability, since the strand has a 2 - 6 times higher slag availability in relation to the thin slab with a thickness in the mold of, for example, 50 mm, which leads to a correspondingly lower heat transfer and lower thermal load on both the strand shell and the mold plates .
Durch die konkave Form der Kokiilenbreitseiten und/oder der Strangführung und/oder durch Elemente, die die Bramme seitlich über ihre Schmalseiten in der Strangführung führen und zentrieren, ist ein Geradelauf des Stranges sichergestellt, der die Gießsicherheit, besonders im Bereich der Kokille, bei hoher Gießgeschwindigkeit von 4 bis 8 m/min. gewährleistet.The concave shape of the broad sides of the mold and / or the strand guide and / or by means of elements which guide and center the slab laterally over its narrow sides in the strand guide ensures that the strand runs in a straight line, which ensures casting reliability, particularly in the area of the mold, at a high level Casting speed from 4 to 8 m / min. guaranteed.
Weiterhin bringt die beschriebene Erfindung den Vorteil einer dickeren Schiackenfilmausbildung zwischen der Strangschale und der Kokillenwand, die auch das Gießen von rißempfindlichen Stahlgüten leichter möglich macht.Furthermore, the described invention brings the advantage of a thicker Schiackenfilmausbildung between the strand shell and the mold wall, which also makes the casting of crack-sensitive steel grades easier.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung schematisch dargestellt und wird nachfolgend beschrieben. Es zeigt:An embodiment of the invention is shown schematically in the drawing and is described below. It shows:
Fig. 1 eine erfindungsgemäße Prozesslinie und1 shows a process line according to the invention and
Fig. 2 in einer Tabelle die Verweilzeiten der Brammen unterschiedlicher Dicken zwischen der Stranggießanlage und dem Ofeneinlauf.Fig. 2 in a table the residence times of the slabs of different thicknesses between the continuous caster and the furnace inlet.
In der Figur 1 sind folgende Anlagenteile wie folgt bezeichnet:In Figure 1, the following parts of the system are designated as follows:
1 Stranggießkokille1 continuous casting mold
2 Zangengerüste2 tongs
3 Sumpfspitze des erstarrenden Stranges3 swamp tip of the solidifying strand
4 Querteileinrichtung4 cross-section device
5 Kühlstrecke5 cooling section
5a Rollgangsabdeckung5a roller table cover
6 Ausgleichsofen6 equalizing furnace
7 Entzunderung7 descaling
8 Duovorgerüst8 Duo front stand
9 Quartovorgerüst9 four-high roughing stand
10 Aufwickelstation 11 Abwickelstation10 take-up station 11 unwinding station
12 Entzunderung12 descaling
13 Fertigstraße13 finishing train
14 Auslaufroligang14 outlet runway
15 Aufwickelhaspel15 take-up reel
16 Reversierwalzgerüst16 reversing roll stand
17 Entzunderung17 descaling
Mit nur einer Stranggießanlage wird die benötigte Jahreskapazität von 2 - 2,5 mio tpa dargestellt. Diese Stranggießanlage zeichnet sich aus durch eineThe required annual capacity of 2 - 2.5 million tpa is represented with just one continuous caster. This continuous caster is characterized by a
Stranggießkokille 1 mit einer Dicke von 140 - 90 mm und einer Konkavität je Breitseite zwischen 30 und 3 mm, einem Zangensegmenten 2 für das Reduzieren der Strangdicke auf min. 90mm und/oder einer Strangführung und Zentrierung mit Hilfe von konkaven Rollenprofilen in der Strangführung und/oder seitlichen Elementen, einer Erstarrungsdicke von 90 -125 mm.Continuous casting mold 1 with a thickness of 140 - 90 mm and a concavity per broadside between 30 and 3 mm, a pliers segment 2 for reducing the strand thickness to min. 90mm and / or a strand guide and centering with the help of concave roller profiles in the strand guide and / or lateral elements, a solidification thickness of 90 -125 mm.
Diese Stranggießanlage kann ohne nennenswerte Gießstörungen mit einerThis continuous caster can with no significant casting disruption
Gießgeschwindigkeit zwischen 4 - 8 m/min. betrieben werdenCasting speed between 4 - 8 m / min. operate
Der aus der Gießanlage tretende Strang S kann nach Einstellung des benötigten Wärmeinhalts für den später notwendigen Walzprozess in denThe strand S emerging from the casting plant can, after setting the required heat content for the later necessary rolling process, in the
Temperaturausgleichsofen 6 einlaufen, der auch als Puffer dienen kann. Dieser Temperaturausgleichsofen 6 ist in seiner Länge (max. 45 m) so bemessen, daß ein spez. Bundgewicht von max. 25 kg/mm erzeugt werden kann. Nach Ausgleich der Temperatur tritt die Bramme B entweder in die Tandem- Vorstraße 8,9 bei Strangdicken < 90 mm oder bei anderem "Layout" in dasTemperature compensation furnace 6 run in, which can also serve as a buffer. This temperature compensation furnace 6 is dimensioned in its length (max. 45 m) so that a spec. Coil weight of max. 25 kg / mm can be generated. After the temperature has been equalized, the slab B either enters the tandem roughing mill 8.9 with strand thicknesses <90 mm or with another "layout"
Reversiergerüst 16 bei Strangdicken < 125 mm. In beiden Fällen wird die Bramme B auf 15 mm Zwischendicke gewalzt. Diese Zwischendicke wird entweder mit der Tandem-Vorstraße 8,9 in 2 Stichen oder mit dem 1 -gerüstigen Reversiergerüst 16 in 3 Stichen erreicht.Reversing stand 16 for strand thicknesses <125 mm. In both cases the slab B is rolled to an intermediate thickness of 15 mm. This intermediate thickness is achieved either with the tandem roughing mill 8.9 in 2 passes or with the 1-stand reversing stand 16 in 3 passes.
Nach Verlassen der Vorstraße 16/8,9 wird das erzeugte Zwischenband Z von z.B. 15mm zwischengewickelt und der 4 - 5 gerüstigen Fertigstraße 13 mit einer vorgeschalteten Entzunderung 12 zugeführt. Hier tritt es mit einer Einzugsgeschwindigkeit von z.B. 0,8 m / see. in das 1. Gerüst der Fertigstraße 13, womit eine Neuverzunderung ausgeschlossen ist, und verläßt das 5. Gerüst der Fertigstraße 13 mit 1 mm Dicke und einer Austrittsgeschwindigkeit von 12 m /see. Auf dem sich ausschließenden Auslaufroligang 14 mit Rolienabständen von min. 100 mm durchläuft es ggf. eine Bandkühlung und wird mit ca. 650°C vom Aufwickelhaspel 15 aufgewickelt.After leaving the roughing mill 16 / 8.9, the intermediate band Z produced, for example 15 mm, is interwound and fed to the 4-5-stand finishing mill 13 with an upstream descaling 12. Here it occurs with a retraction speed of, for example, 0.8 m / see. into the 1st scaffolding of the finishing train 13, which prevents new scaling, and leaves the 5th scaffolding the finishing train 13 with a thickness of 1 mm and an exit speed of 12 m / see. On the exclusive Auslaufroligang 14 with min. If necessary, it runs through a belt cooling 100 mm and is wound up by the take-up reel 15 at approx. 650 ° C.
Der Auslaufroligang 14 zeichnet sich durch besonderes kleinem Rollen und damit Rollenabständen aus, um die dünnen Bänder gut zu führen und ein Abheben des Bandes zu vermeiden. Auch ist ein Haspel kurz hinter dem letzten Fertiggerüst (5-15mm) mit vorgeschalteter Bandkühlung alternativ möglichThe Auslaufroligang 14 is characterized by a particularly small rolling and thus roller spacing in order to guide the thin strips well and to avoid lifting the strip. Alternatively, a reel just behind the last finishing stand (5-15mm) with upstream belt cooling is possible
Diese so erzeugten dünnen Warmbänder können einen großen Teil der Kaltwalzbänder auf dem Markt ersetzen und ermöglichen somit auch einen großen Kosten- und Energievorteil gegenüber den normalen Produktionslinien.The thin hot strips produced in this way can replace a large part of the cold rolled strips on the market and thus also enable a great cost and energy advantage over the normal production lines.
Fig. 2 stellt tabellarisch die Verweilzeiten der Brammen B unterschiedlicher Dicken zwischen der Stranggießanlage 1 ,2 und dem Einlauf in den Ausgleichofen 6 dar, die dazu notwendig sind, daß die Bramme B über Strahlung den benötigten Wärmeinhalt für die Walzstufe beim Einlauf in den Ausgleichsofen 6 aufweist.Fig. 2 shows in table form the dwell times of the slabs B of different thicknesses between the continuous caster 1, 2 and the inlet into the equalizing furnace 6, which are necessary for the slab B to have the required heat content for the rolling stage when entering the equalizing furnace 6 via radiation having.
Diese max. Verweilzeit kann auch durch eine Wasserkühlung 5 verkürzt oder durch eine Rollgangsabdeckung 5a, z.B. im Falle von geringen Stranggießgeschwindigkeiten von 4m/min. verlängert werden.This max. Residence time can also be shortened by water cooling 5 or by a roller table cover 5a, e.g. in the case of low continuous casting speeds of 4m / min. be extended.
Vorteile der Erfindung zur Erzeugung von Warmband sind:Advantages of the invention for producing hot strip are:
• minimales Investitionsvolumen durch nur eine einzige Hochgeschwindigkeits- Stranggießanlage, deren Kapazität mit der des• Minimum investment volume thanks to a single high-speed continuous caster, the capacity of which is equal to that of the
• Walzwerkes in Gleichgewicht steht wodurch sich • minimalste Umwandlungskosten und• Rolling mill is in balance which means • minimal conversion costs and
• dünnste Banddicken, die gleichzeitig Teile des Kaltband-Produktbereiches bedingt durch einen geringeren Energieverbrauch und Gesamtumwandlungs- kosten substituieren, einstellen. Außerdem macht die Konzeption der Stranggießanlage es möglich, peritektische Stähle (0,08 bis 0,15 % Gew.C) rißfrei auch bei hohen Gießgeschwindigkeiten gießen zu können. Man kann aufgrund von Untersuchungen beispielsweise ι davon ausgehen, daß bei einem maximalen Wärmedurchgang von 1 ,9 MW/m2 • Set the thinnest strip thicknesses, which at the same time replace parts of the cold strip product range due to lower energy consumption and overall conversion costs. In addition, the design of the continuous caster makes it possible to cast peritectic steels (0.08 to 0.15% by weight C) without cracks, even at high casting speeds. On the basis of studies, it can be assumed, for example, that with a maximum heat transfer of 1.9 MW / m 2
5 keine Längsrisse in der Kokille entstehen. Legt man dies zugrunde, so würden bei folgenden Anlageπkriterien keine Längsrisse in der Kokille entstehen.5 there are no longitudinal cracks in the mold. If this is taken as a basis, no longitudinal cracks would occur in the mold with the following investment criteria.
A 100 mm Strangdicke in der KokilleA 100 mm strand thickness in the mold
6 m/min maximale Gießgeschwindigkeit 10 ca. 300 t/h bzw. 2,1 Mio tpa6 m / min maximum casting speed 10 approx. 300 t / h or 2.1 million tpa
Kokillendicke = Erstarrungsdicke oder B 75 mm Strangdicke in der KokilleMold thickness = solidification thickness or B 75 mm strand thickness in the mold
4,5 m/min maximale Gießgeschwindigkeit 15 ca. 150 t/h bzw. 1 ,05 Mio tpa4.5 m / min maximum casting speed 15 approx. 150 t / h or 1.05 million tpa
Kokillendicke = Erstarrungsdicke oder C 50 mm Strangdicke in der KokilleMold thickness = solidification thickness or C 50 mm strand thickness in the mold
2,7 m/min maximale Gießgeschwindigkeit 20 ca. 50 t/h bzw. 0,35 Mio tpa2.7 m / min maximum casting speed 20 approx. 50 t / h or 0.35 million tpa
Kokille = Erstarrungsdicke.Mold = solidification thickness.
Bedingt durch die Gießleistung stehen somit die Anlagen A und B zur Diskussion. Im Fall A reicht eine Anlage für die Auslastung einer Fertigstraße mit 25 ca. 2,5 Mio tpa, im Fall B sind zwei Anlagen für die Auslastung der Fertigstraße notwendig.Due to the casting performance, plants A and B are up for discussion. In case A, one plant is sufficient for the utilization of a finishing train with 25 approx. 2.5 million tpa, in case B two plants are required for the utilization of the finishing train.
Wird der oben angegebene Wärmedurchgang von 1 ,9 MW/m2 nicht überschritten, so ist eine mittlere Hauttemperatur der Kupferplatte in der Kokille , 30 von 550° K oder 277° C und eine maximale Haltbarkeit von ca. 770 Schmelzen bzw. Stunden zu erwarten.If the heat transfer of 1.9 MW / m 2 specified above is not exceeded, an average skin temperature of the copper plate in the mold, 30 of 550 ° K or 277 ° C and a maximum shelf life of approx. 770 melts or hours can be expected .
Faßt man die aufgezeigten Möglichkeiten unterschiedlicher Anlagenkonzepte zusammen und geht davon aus, daß unterhalb des Wärmedurchgangs von 35 19 MW/m2 ein rißfreies Gießen peritekischer Stähle möglich ist, so würde eine Dünnbrammendicke zwischen 100 und 75 mm das längsrißfreie Gießen von Dünnenbrammen peritektischer Stahlgüten mit Gießgeschwindigkeiten bis zu 6 bzw. 4,5 m/min möglich machen. If one summarizes the possibilities of different plant concepts and assumes that below the heat transfer of 35 19 MW / m 2 a crack-free casting of peritekic steels is possible, one would Thin slab thicknesses between 100 and 75 mm make it possible to cast thin slabs of peritectic steel grades free of longitudinal cracks at casting speeds of up to 6 or 4.5 m / min.

Claims

Patentansprüche claims
1. Anlage zur Herstellung von warmgewalztem Stahlband aus bandförmig stranggegossenem Vormaterial in aufeinanderfolgenden Arbeitsschritten, in der das erstarrte Vormaterial mittels einer Strangteilanlage in Vorbandlängen aufgeteilt und nach dem Entzundern der Oberfläche, in einem Ausgleichsofen auf Walztemperatur gebracht, in einem ersten als Vorstraße eingesetzten Walzwerk in mindestens zwei Walzstichen vorgewalzt und nach Zwischenspeicherung in vor der Fertigstraße angeordneten Auf- und Abwickelstationen nach vorgeschalteter Entzunderung der Fertigstraße zum1.System for the production of hot-rolled steel strip from strip-shaped, continuously cast primary material in successive work steps, in which the solidified primary material is divided into preliminary strip lengths by means of a continuous section plant and, after descaling the surface, brought to rolling temperature in a compensating furnace, in a first rolling mill used as a roughing train in at least two pre-rolled passes and after intermediate storage in winding and unwinding stations arranged in front of the finishing train after the descaling of the finishing train before
Auswalzen auf Fertigbanddicke zugeführt wird, gekennzeichnet durch eine Stranggießanlage mit einer Gießwalzeinrichtung (2) zum Herstellen des bandförmigen Vormaterials (S) mit einer Gießgeschwindigkeit von 4-8 m/min und einer Erstarrungsdicke von 90-125 mm unter Verwendung einer oszillierendenRolling out to finished strip thickness is characterized, characterized by a continuous caster with a casting roll device (2) for producing the strip-shaped primary material (S) with a casting speed of 4-8 m / min and a solidification thickness of 90-125 mm using an oscillating
Stranggießkokille (1) mit Konkavität zwischen Gießspiegel und Kokillenaustritt und/oder einer Strangführung mit Konkavität und/oder mit Zentrierungs- und Führungselementen im Strangführungsgerüst (2) im Bereich ihrer Schmalseiten zum Führen und Zentrieren der Bramme (B), eine zwischen Stranggießanlage (1 ,2) und Ausgleichsofen (6) vorgesehener Kühl- bzw. Isolierstrecke (5,5a) für das bandförmige Vormaterial (S) und einen der Strangteilanlage (4) nachgeordneten und der Vorstraße (8,9,16) vorgeordneten Ausgleichsofen (6) von ca. 45m Länge und ca. 5 bis 20m Breite.Continuous casting mold (1) with concavity between the casting level and mold outlet and / or a strand guide with concavity and / or with centering and guiding elements in the strand guide frame (2) in the area of its narrow sides for guiding and centering the slab (B), one between the continuous casting system (1, 2) and compensating furnace (6) provided cooling or insulating section (5,5a) for the strip - like primary material (S) and a compensating furnace (6) downstream of the strand subsystem (4) and upstream of the preliminary mill (8,9,16) of approx 45m long and about 5 to 20m wide.
2. Anlage zur Herstellung von warmgewalztem Stahlband aus bandförmig stranggegossenem Vormaterial nach Anspruch 1 , dadurch gekennzeichnet, daß die Stranggießkokille (1) einen Breitseitenabstand von 140 bis 90 mm und eine Konkavität je Breitseite zwischen Gießspiegel und Kokillenaustritt zwischen 30 und 3 mm aufweist und das Vormaterial (S) im letzten Zangensegment (2) auf min. 90mm reduzierbar ist. 2. Plant for the production of hot-rolled steel strip from strip-shaped continuous material according to claim 1, characterized in that the continuous casting mold (1) has a wide side spacing of 140 to 90 mm and a concavity per wide side between the mold level and the mold outlet between 30 and 3 mm and the starting material (S) in the last pliers segment (2) to min. Is 90mm reducible.
3. Anlage zur Herstellung von warmgewalztem Stahlband aus bandförmig stranggegossenem Vormaterial nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die Vorstraße bei Vorband- bzw, Brammendicken <90 mm als zweigerüstige Tandem-Vorstraße (8,9) ausgebildet ist.3. Plant for the production of hot-rolled steel strip from strip-shaped continuously cast material according to claim 1 and 2, characterized in that the roughing mill is designed as a two-stand tandem roughing mill (8,9) with pre-strip or slab thicknesses <90 mm.
4. Anlage zur Herstellung von warmgewalztem Stahlband aus bandförmig stranggegossenem Vormaterial nach Anspruch 1 bis 3, daß die Vorstraße bei Vorband- bzw, Brammendicken <125 mm als Reversierstraße (16) ausgebildet ist. 4. Plant for the production of hot-rolled steel strip from strip-shaped continuously cast starting material according to claim 1 to 3, that the roughing mill is designed as a reversing mill (16) for pre-strip or slab thicknesses <125 mm.
EP96928327A 1995-07-31 1996-07-19 High-speed thin-slabbing plant Expired - Lifetime EP0841995B1 (en)

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DE19529049A DE19529049C1 (en) 1995-07-31 1995-07-31 High-speed thin slab plant
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PCT/DE1996/001378 WO1997005971A1 (en) 1995-07-31 1996-07-19 High-speed thin-slabbing plant

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