EP1144705B1 - Method and device for producing coated metal strands, especially steel strips - Google Patents

Method and device for producing coated metal strands, especially steel strips Download PDF

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Publication number
EP1144705B1
EP1144705B1 EP00901068A EP00901068A EP1144705B1 EP 1144705 B1 EP1144705 B1 EP 1144705B1 EP 00901068 A EP00901068 A EP 00901068A EP 00901068 A EP00901068 A EP 00901068A EP 1144705 B1 EP1144705 B1 EP 1144705B1
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EP
European Patent Office
Prior art keywords
thickness
metal strand
strand
stripping
melt
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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.)
Expired - Lifetime
Application number
EP00901068A
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German (de)
French (fr)
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EP1144705A3 (en
EP1144705A2 (en
Inventor
Fritz-Peter Pleschiutschnigg
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SMS Siemag AG
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SMS Schloemann Siemag AG
Schloemann Siemag AG
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Publication of EP1144705A3 publication Critical patent/EP1144705A3/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/008Continuous casting of metals, i.e. casting in indefinite lengths of clad ingots, i.e. the molten metal being cast against a continuous strip forming part of the cast product
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003Apparatus
    • C23C2/0035Means for continuously moving substrate through, into or out of the bath
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003Apparatus
    • C23C2/0036Crucibles
    • C23C2/00361Crucibles characterised by structures including means for immersing or extracting the substrate through confining wall area
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/50Controlling or regulating the coating processes

Definitions

  • the invention relates to a method and an apparatus for generating coated strands of metal, especially steel strips, in which a Metal strand through the bottom of a vessel filled with melt of the same or different composition as the metal strand is performed, the Dwell time of the metal strand depending on the melt pool height, the Casting speed, the metal strand thickness and the preheating temperature of the metal strand is chosen so that the deposited melt on the metal strand desired thickness of several times the initial thickness of the metal strand assumes and the metal strand with crystallized layer after emerging from the Melting bath experiences a smoothing stitch, which is carried out when the Surface temperature of the crystallized strand is lower than the solidus temperature of the melt pool and thus at least the surface of the crystallized Layer has solidified
  • the belt then experiences when it passes through the pair of smoothing rollers a strong hypothermia, with which the tendency to crack both longitudinally and occurs across the tape direction. This risk increases with higher casting and Rolling speeds.
  • the smoothing stitch is therefore carried out there if the surface temperature of the crystallized strand is lower than the solidus temperature of the melt pool and thus at least the surface of the crystallized layer has solidified. Nevertheless, it cannot be ruled out that the Thickness of the crystallized layer fluctuates.
  • the invention is therefore based on the object of a method and a device to create a smoothing of the tape with a tape thickness tolerance of maximum 2% without cracking in both the surface and inside of the belt Ensure simultaneous thickness control of the crystallization.
  • the main features for creating flawless, flat-coated tapes for example with a width / thickness ratio greater than 60 and a total thickness of a maximum of 12 mm, preferably 2 to 6 mm, of one material or of Composites of different metal grades such as carbon steel as a mono material or carbon steel with a stainless steel coating of at least 5% of the total strip thickness as a composite material and a thickness deviation of maximum 2% between the edge (40 mm from the edge) and the middle of the tape, are of the same thickness with respect to the desired goal of the crystallized Layer in particular characterized in that between the weld pool and a stripping of the crystallization at the beginning of the solidification on the strip surface with a desired thickness to a smaller thickness. In the end it will only stripped or carried as much material as is necessary to make the same To achieve the thickness of the crystallized layer over the length of the strand. It will thus the excess of the crystallized layer stripped.
  • Figures 1 and 2 give the overall view of the method and the device for smoothing coated strands, preferably strips of steel 1 using a Smoothing roller pair 2 again.
  • the mother tape 1.1 is filled in the crystallizer 3 Melt 3.3, which is introduced via a melt inlet 3.1, through the nozzles a bottom inlet device 3.2 with a casting and rolling speed 7.1 of 0.05 to 10 m / s by means of a pair of drive rollers 1.5 below the crystal illuminator promoted.
  • the mother tape 1.1 with a temperature of either 20 to 80 ° C before entering the crystallizer 3 begins at the nozzle outlet 3.2 above the steel meniscus 3.5 the crystallization 3.6 of the melt in point 3.6.1 and removes the melt 3.3 Overheating and crystallization energy with simultaneous heating.
  • This Energy flow 4 from the melt into the mother tape takes place when passing through the Mother band through the melt pool 3.3 between the meniscus 3.5 and the Bath surface 3.4 over the melt pool height 3.3.1 instead.
  • the coated tape 1 At the exit 5 of the coated tape 1 from the bath surface 3.4 of the weld pool with a Surface roughness 1.3 it has a certain thickness 1.2, which in essentially from the strip temperature when entering the crystallizer, from the Melt temperature and the contact time of the strip with the melt determined with which the strip 1 enters the roll gap 2.1 of the pair of smoothing rollers 2.
  • the tape 1 coated in this way is at the outlet 5 from the bath 3.4 on the surface "doughy" (two phases: melt and crystal) and has a surface roughness 1.3 of greater than 2% that meet the flatness criteria of a tape with a Width / thickness ratio greater than 60 does not do it justice.
  • the crystallization 3.6 in the bath 3.3 has a temperature 8 on its surface 4.1 (T-x), which is greater than the solidus temperature and less than the liquidus temperature (T-li> T-x> T-sol) is and has a two-phase state consisting of melt and crystal, on.
  • T-x temperature 8 on its surface 4.1
  • T-li> T-x> T-sol liquidus temperature
  • T-sol liquidus temperature
  • the melt with the reversal of the energy flow 6 begins Solidification of the residual melt in the crystallized layer consisting of the Phases melt and crystal, from the surface of the tape 1 perpendicular in Towards the middle of the belt and in the surface itself towards the pair of smoothing rollers 2 parallel to the casting and rolling direction 7, i.e. the surface temperature of the belt decreases, starting from the bath surface 3.4 at point 5 in the direction of Smoothing roller pair 2, continuously, passes through the solidus temperature in point 9.3 Inlet 2.1.1 of the coated tape 1 in the pair of smoothing rollers 2, where they then Assumes a value below T-Solidus.
  • This stripping 20 or control of the coating thickness can alternatively both with a mechanical scraper 22 (knife) made of metal and / or ceramic exists and can also be cooled, as well as with a pneumatic scraper that is operated with an oxygen-free gas jet 23 exist.
  • both types of wipers 22 and 23 can be used sequentially reach.
  • both wipers are in their position, i.e. with their distance to Belt surface 1.3, to the bath surface 3.4 and to each other freely selectable.
  • FIG. 3 shows the area of the pair of smoothing rollers 2 in somewhat more detail Coated strip 1 with its crystallization 3.6 runs in the roll gap 2.1.1 a surface temperature, T-2.1.1 less than T-Solidus (T-2.1.1 ⁇ T-sol) and occurs with a controlled reduced temperature T-2.1.2 less than T-2.1.1 (T-2.1.2 ⁇ T-2.1.1 ⁇ T-sol) out of the roll gap 2.1 at its outlet 2.1.2.
  • the Temperature loss in the roll gap should be checked and kept small.
  • This can according to the invention by an appropriately controlled heat transfer Smoothing roller pair 2 with internal cooling 2.5 and heat-controlling layer 2.6 or Layers can be achieved.
  • rollers 2 you Layer structure 2.6 and the choice of different roller materials such as Steel, metals, metal ceramics and / or ceramics can be coordinated.
  • the entire space 11 above the bath surface 3.4 is in its temperature and Atmosphere (nitrogen and / or argon) controlled so that those described above Conditions are ensured and an oxidation of the bath surface is avoided.
  • the strip coated in this way is directly or indirectly a further rolling mill 12 and Rolling process for the production of finished hot strip and / or cold strip both as Mono material as well as composite material with or without pre-switched stain fed.
  • control and / or regulate the temperature field in the coated Band 1 and on the band surface 1.3 between the melt pool surface 3.4 and the exit of the coated and smoothed belt 1.4.1 from the pair of smoothing rollers 2 are measuring devices for temperature detection 2.8 on the inside of the heat-controlled wall elements 6.2 attached.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Wire Processing (AREA)
  • Ropes Or Cables (AREA)
  • Coating With Molten Metal (AREA)
  • Metal Rolling (AREA)

Abstract

A method for producing coated strands of metal includes guiding a metal strand through the bottom of a vessel filled with a molten mass of the same or different composition as the metal strip, wherein the residence time of the metal strand is selected as a function of at least one of the molten bath level, the casting speed, the metal strand thickness, and the preheating temperature of the metal strand such that the deposited molten mass on the metal strand has a desired thickness of several times the initial thickness of the metal strand. After exiting from the molten bath, the metal strand with a layer crystallized thereon is subjected to a smoothing path carried out when the surface temperature of the strand crystallized thereon is smaller than the solidus temperature of the molten bath, so that at least the surface of the layer crystallized thereon is solidified. The crystallized layer is applied with a thickness which exceeds the desired final thickness of the coated strand. Between the molten bath and the beginning of the solidification while still in the doughy state of crystallization, stripping of the crystallized layer is carried out to a controlled uniform smaller thickness over the length of the strand.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Erzeugung von beschichteten Strängen aus Metall, insbesondere von Bändern aus Stahl, bei dem ein Metallstrang durch den Boden eines Gefäßes, gefüllt mit Schmelze gleicher oder unterschiedlicher Zusammensetzung wie der Metallstrang, geführt wird, wobei die Verweilzeit des Metallstranges in Abhängigkeit von der Schmelzbadhöhe, der Gießgeschwindigkeit, der Metallstrangdicke und der Vorwärmtemperatur des Metallstranges so gewählt wird, daß die abgelagerte Schmelze auf dem Metallstrang eine gewünschte Dicke von dem Mehrfachen der Ausgangsdicke des Metallstranges annimmt und der Metallstrang mit ankristallisierter Schicht nach Austritt aus dem Schmelzebad einen Glättstich erfährt, der dann vorgenommen wird, wenn die Oberflächentemperatur des ankristallisierten Stranges kleiner als die Solidus-Temperatur des Schmelzbades ist und damit zumindest die Oberfläche der ankristallisierten Schicht erstarrt istThe invention relates to a method and an apparatus for generating coated strands of metal, especially steel strips, in which a Metal strand through the bottom of a vessel filled with melt of the same or different composition as the metal strand is performed, the Dwell time of the metal strand depending on the melt pool height, the Casting speed, the metal strand thickness and the preheating temperature of the metal strand is chosen so that the deposited melt on the metal strand desired thickness of several times the initial thickness of the metal strand assumes and the metal strand with crystallized layer after emerging from the Melting bath experiences a smoothing stitch, which is carried out when the Surface temperature of the crystallized strand is lower than the solidus temperature of the melt pool and thus at least the surface of the crystallized Layer has solidified

Bei einem aus der EP 0 832 990 A2 bekanntgewordenen Verfahren und Vorrichtung wird ein Nachteil bei der Erzeugung von beschichteten Metallsträngen, vorzugsweise Bänder aus einer Stahlgüte oder unterschiedlichen Stahlgüten, wie z.B. Monomaterial oder Verbundmaterial und hier im besonderen auch Verbundmaterial aus Kohlenstoff-Stahl, dünnbeschichtet mit Rostfrei-Stählen behoben. Als nachteilig hat sich bei derartigen Inversionsgießeinrichtungen bei einer ankristallisierten Schicht mit einer "teigigen Oberfläche und teigigem Kem" gezeigt, daß die am Mutterband anhaftende Schicht einerseits zwar schon relativ weit erstarrt ist, aber andererseits in ihrer Außenzone noch ausreichende Anteile an flüssiger Phase beim Eintritt in das Glättrollenpaar aufweist. Das Band erfährt dann beim Durchlaufen des Glättrollenpaares eine starke Unterkühlung, womit die Neigung der Rißbildung sowohl längs und quer zur Bandrichtung auftritt. Diese Gefahr erhöht sich noch bei höheren Gieß- und Walzgeschwindigkeiten. Es wird dort deshalb der Glättstich dann vorgenommen, wenn die Oberflächentemperatur des ankristallisierten Stranges kleiner als die Solidus-Temperatur des Schmelzbades ist und damit zumindest die Oberfläche der ankristallisierten Schicht erstarrt ist. Gleichwohl ist nicht auszuschließen, daß die Dicke der ankristallisierten Schicht schwankt.In a method and device which has become known from EP 0 832 990 A2 becomes a disadvantage in the production of coated metal strands, preferably Strips of a steel grade or different steel grades, e.g. mono material or composite material and here in particular also composite material Fixed carbon steel, thinly coated with rustproof steels. As a disadvantage with such an inversion casting device with a crystallized layer a "pasty surface and pasty core" showed that the on the mother tape adhering layer is already relatively solidified on the one hand, but on the other hand in their outer zone still sufficient portions of liquid phase when entering the Has a pair of smoothing rollers. The belt then experiences when it passes through the pair of smoothing rollers a strong hypothermia, with which the tendency to crack both longitudinally and occurs across the tape direction. This risk increases with higher casting and Rolling speeds. The smoothing stitch is therefore carried out there if the surface temperature of the crystallized strand is lower than the solidus temperature of the melt pool and thus at least the surface of the crystallized layer has solidified. Nevertheless, it cannot be ruled out that the Thickness of the crystallized layer fluctuates.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zu schaffen, die eine Glättung des Bandes mit einer Banddickentoleranz von maximal 2% ohne Rißbildung sowohl in der Oberfläche als auch im Inneren des Bandes bei gleichzeitiger Dickenkontrolle der Ankristallisation sicherstellen.The invention is therefore based on the object of a method and a device to create a smoothing of the tape with a tape thickness tolerance of maximum 2% without cracking in both the surface and inside of the belt Ensure simultaneous thickness control of the crystallization.

Die überraschende Lösung wird hinsichtlich des Verfahrens durch die in den Ansprüchen 1 bis 3 angegebenen kennzeichnenden Merkmale und bezüglich der Vorrichtung durch die in den Ansprüchen 4 bis 7 enthaltenen Merkmale erreicht.The surprising solution is in terms of the method by the in the Claims 1 to 3 specified characteristic features and with respect to Device achieved by the features contained in claims 4 to 7.

Die Hauptmerkmale zur Erzeugung von fehlerfreien, planbeschichteten Bändem, beispielsweise mit einem Breite-/Dicke-Verhältnis größer 60 und einer Gesamtdicke von maximal 12 mm, vorzugsweise 2 bis 6 mm, aus einem Werkstoff oder aus Verbundwerkstoffen unterschiedlicher Metallgüten wie Kohlenstoff-Stahl als Monowerkstoff oder Kohlenstoff-Stahl mit einer Rostfrei-Stahl-Beschichtung von mindestens 5% der Gesamtbanddicke als Verbundwerkstoff und einer Dickenabweichung von maximal 2% zwischen dem Rand (40 mm von der Kante) und der Mitte des Bandes, sind hinsichtlich des angestrebten Ziels einer gleichen Dicke der ankristallisierten Schicht insbesondere dadurch gekennzeichnet, daß zwischen dem Schmelzbad und dem Beginn der Erstarrung auf der Bandoberfläche eine Abstreifung der Ankristallisation mit einer gewünschten Dicke auf eine kleinere Dicke erfolgt. Im Endeffekt wird nur so viel Material abgestreift bzw. -getragen, wie erforderlich ist, um eine gleiche Dicke der ankristallisierten Schicht über die Länge des Stranges zu erreichen. Es wird somit das Übermaß der ankristallisierten Schicht abgestreift.The main features for creating flawless, flat-coated tapes, for example with a width / thickness ratio greater than 60 and a total thickness of a maximum of 12 mm, preferably 2 to 6 mm, of one material or of Composites of different metal grades such as carbon steel as a mono material or carbon steel with a stainless steel coating of at least 5% of the total strip thickness as a composite material and a thickness deviation of maximum 2% between the edge (40 mm from the edge) and the middle of the tape, are of the same thickness with respect to the desired goal of the crystallized Layer in particular characterized in that between the weld pool and a stripping of the crystallization at the beginning of the solidification on the strip surface with a desired thickness to a smaller thickness. In the end it will only stripped or carried as much material as is necessary to make the same To achieve the thickness of the crystallized layer over the length of the strand. It will thus the excess of the crystallized layer stripped.

Die Abstreifung der Ankristallisation mit einer gewünschten Dicke auf eine kleinere Dicke wird vorrichtungsmäßig vorteilhaft zwischen dem Schmelzbad und dem Beginn der Erstarrung auf der Bandoberfläche vorgenommen, wobei die Wände des das Glättrollenpaar aufnehmenden Raumes sowie das Glättrollenpaar selbst wärmekontrolliert ausgebildet sind. Zur Abstreifung eignen sich vorteilhaft mechanische Abstreifvorrichtungen in Form von vorzugsweise Messern, alternativ läßt sich eine pneumatische Abstreifvorrichtung einsetzen.The stripping of the crystallization with a desired thickness to a smaller one In terms of device, thickness becomes advantageous between the molten bath and the beginning of solidification on the surface of the strip, the walls of the Smoothing roller pair receiving space and the smoothing roller pair itself heat-controlled are trained. Mechanical ones are advantageously suitable for stripping Scraper devices in the form of preferably knives, alternatively one Use pneumatic scraper.

In den Figuren 1 bis 3 ist die Erfindung sowohl hinsichtlich des Verfahrens als auch der Vorrichtung dargestellt. Es zeigen:

Figur 1
eine Gesamtansicht des Verfahrens und seiner Vorrichtung zur Glättung von beschichteten Strängen aus Metall vorzugsweise von Bändern aus Stahl;
Figur 2
ein Temperaturfeld des Stranges zwischen dem Bandeintritt in den Kristallisator und dem Glättrollenpaar während des Gießens;
Figur 3
ein beschichtetes Band zwischen der Schmelzbadoberfläche im Kristallisator und dem Glättrollenpaar, Detail aus Fig. 1.
In Figures 1 to 3, the invention is shown both in terms of the method and the device. Show it:
Figure 1
an overall view of the method and its device for smoothing coated strands of metal, preferably of steel strips;
Figure 2
a temperature field of the strand between the strip entry into the crystallizer and the pair of smoothing rollers during casting;
Figure 3
a coated tape between the melt pool surface in the crystallizer and the pair of smoothing rollers, detail from FIG. 1.

Die Figuren 1 und 2 geben die Gesamtansicht des Verfahrens und die Vorrichtung zur Glättung beschichteter Stränge vorzugsweise Bänder aus Stahl 1 mittels eines Glättrollenpaares 2 wieder. Das Mutterband 1.1 wird in den Kristallisator 3, gefüllt mit Schmelze 3.3, die über einen Schmelzenzulauf 3.1 eingeleitet wird, duch die Düsen einer Bodeneinlaßvorrichtung 3.2 mit einer Gieß- und Walzgeschwindigkeit 7.1 von 0,05 bis 10 m/s mittels eines Antriebsrollenpaares 1.5 unterhalb des Kristalllisators gefördert. Figures 1 and 2 give the overall view of the method and the device for smoothing coated strands, preferably strips of steel 1 using a Smoothing roller pair 2 again. The mother tape 1.1 is filled in the crystallizer 3 Melt 3.3, which is introduced via a melt inlet 3.1, through the nozzles a bottom inlet device 3.2 with a casting and rolling speed 7.1 of 0.05 to 10 m / s by means of a pair of drive rollers 1.5 below the crystal illuminator promoted.

Das Mutterband 1.1, mit einer Temperatur von wahlweise 20 bis 80°C vor Eintritt in den Kristallisator 3, beginnt oberhalb des Stahlmeniskus 3.5 am Düsenaustritt 3.2 mit der Ankristallisation 3.6 von Schmelze in Punkt 3.6.1 und entzieht der Schmelze 3.3 Überhitzungs- und Kristallisationsenergie unter gleichzeitiger Erwärmung. Dieser Energiestrom 4 aus der Schmelze in das Mutterband findet beim Durchlaufen des Mutterbandes durch das Schmelzbad 3.3 zwischen dem Meniskus 3.5 und der Badoberfläche 3.4 über die Schmelzbadhöhe 3.3.1 statt. Beim Austritt 5 des beschichteten Bandes 1 aus der Badoberfläche 3.4 des Schmelzbades mit einer Oberflächenrauhigkeit 1.3 hat es eine bestimmte Dicke 1.2 erreicht, die im wesentlichen von der Bandtemperatur beim Einlauf in den Kristallisator, von der Schmelzentemperatur und der Kontaktzeit des Bandes mit der Schmelze bestimmt wird, mit der das Band 1 in den Walzspalt 2.1 des Glättrollenpaares 2 einläuft.The mother tape 1.1, with a temperature of either 20 to 80 ° C before entering the crystallizer 3 begins at the nozzle outlet 3.2 above the steel meniscus 3.5 the crystallization 3.6 of the melt in point 3.6.1 and removes the melt 3.3 Overheating and crystallization energy with simultaneous heating. This Energy flow 4 from the melt into the mother tape takes place when passing through the Mother band through the melt pool 3.3 between the meniscus 3.5 and the Bath surface 3.4 over the melt pool height 3.3.1 instead. At the exit 5 of the coated tape 1 from the bath surface 3.4 of the weld pool with a Surface roughness 1.3 it has a certain thickness 1.2, which in essentially from the strip temperature when entering the crystallizer, from the Melt temperature and the contact time of the strip with the melt determined with which the strip 1 enters the roll gap 2.1 of the pair of smoothing rollers 2.

Das so beschichtete Band 1 ist am Austritt 5 aus dem Bad 3.4 an der Oberfläche "teigig" (zwei Phasen: Schmelze und Kristall) und weist eine Oberflächenrauhigkeit 1.3 von größer 2% auf, die den Planheitskriterien eines Bandes mit einem Breite-/Dicke-Verhältnis von größer als 60 nicht gerecht wird.The tape 1 coated in this way is at the outlet 5 from the bath 3.4 on the surface "doughy" (two phases: melt and crystal) and has a surface roughness 1.3 of greater than 2% that meet the flatness criteria of a tape with a Width / thickness ratio greater than 60 does not do it justice.

Beim Verlassen des beschichteten Bandes 1 aus dem Bad 3.4 mit der Enddicke 5.1 verläuft die Erstarrung vom Austritt 5 bis zum Glättrollenpaar 2 und darüber hinaus in der ankristallisierten Schicht, die aus Schmelze und Kristal besteht, von außen nach innen, d.h. der Energiestrom 6 kehrt sich im Vergleich zu dem Wärmestrom 4 in der Schmelze 3.3 um und verläuft von innen (Bandmitte) nach außen in die Wände 6.1 mit wärmekontrollierten Durchgang. Dieser kontrollierte Wärmestrom kann durch Wandelemente 6.2 in entsprechend für die Temperaturführung des Bandes 1 notwendige Zonen in Gieß- und Walzrichtung 7 aufgeteilt werden. Diese Vorrichtungsmerkmale erlauben es, den Wärmestrom 6 vom Band zu den wärmedurchgangskontrollierten Wänden 6.1 und 6.2 zu beherrschen, d.h. zu steuern oder in Abhängigkeit von der Stahlgüte, der Gießgeschwindigkeit 7.1 und der Position 2.4 des Glättrollenpaares 2 zu regeln. When leaving the coated tape 1 from the bath 3.4 with the final thickness 5.1 the solidification runs from outlet 5 to smoothing roller pair 2 and beyond in the crystallized layer, which consists of melt and crystal, from the outside inside, i.e. the energy flow 6 reverses in comparison to the heat flow 4 in the Melt 3.3 and runs from the inside (strip center) to the outside into the walls 6.1 heat-controlled passage. This controlled heat flow can be through wall elements 6.2 in necessary for the temperature control of the belt 1 Zones in the casting and rolling direction 7 can be divided. These device features allow the heat flow 6 from the belt to the heat transfer controlled Master walls 6.1 and 6.2, i.e. to control or depending on the Steel grade, the casting speed 7.1 and the position 2.4 of the smoothing roller pair 2 to regulate.

Zur Beschreibung und zum Verständnis der unerwarteten Lösung, die die Erfindung ausmacht, ist es auch notwendig, die Temperaturfelder und damit die Phasenzustände des beschichteten Bandes 1 im Wechselspiel mit den Wärmeströmen 4.6 und 2.7 von der Schmelze 3.3 in das Mutterband 1.1, vom beschichteten Band 1 in die Wände mit einem wärmekontrollierten Durchgang 6.1 zwischen der Badoberfläche 3.4 und dem Glättrollenpaar 2 sowie darüber hinaus vom beschichteten Band 1 im Walzspalt 2.1 des Glättrollenpaares 2 über den Walzenkörper in die Innenkühlung 2.5 des Glättrollenpaares zu kontrollieren.To describe and understand the unexpected solution to the invention it is also necessary to determine the temperature fields and thus the Phase states of the coated tape 1 in interaction with the Heat flows 4.6 and 2.7 from the melt 3.3 into the mother tape 1.1, from coated tape 1 in the walls with a heat controlled passage 6.1 between the bath surface 3.4 and the pair of smoothing rollers 2 and beyond from coated band 1 in the roll gap 2.1 of the pair of smoothing rollers 2 over the Check the roller body into the internal cooling 2.5 of the pair of smoothing rollers.

Die Ankristallisation 3.6 im Bad 3.3 besitzt auf ihrer Oberfläche 4.1 eine Temperatur 8 (T-x), die größer als die Solidus-Temperatur und kleiner als die Liquidus-Temperatur (T-li > T-x > T-sol) ist und weist einen Zwei-Phasenzustand, bestehend aus Schmelze und Kristall, auf. Diese Ankristallisation nimmt in ihrer Temperatur von der Oberfläche senkrecht zum Mutterband 1.1 stetig ab. Funktional zum Oberflächenprofil 4.1 der Ankristallisation 3.6 verläuft die Liquidus-Isotherme 10 im Schmelzbad bis an die Badoberfläche 3.4.The crystallization 3.6 in the bath 3.3 has a temperature 8 on its surface 4.1 (T-x), which is greater than the solidus temperature and less than the liquidus temperature (T-li> T-x> T-sol) is and has a two-phase state consisting of melt and crystal, on. The temperature of this crystallization decreases from the surface perpendicular to the mother tape 1.1. Functional to the surface profile 4.1 of the Crystallization 3.6 runs the liquidus isotherm 10 in the melt pool up to the Bath surface 3.4.

Beim Auftauchen des beschichteten Bandes 1 aus dem Bad 3.4 an der Stelle 5 ist die aufgeschmolzene Schicht 9.2 des Mutterbandes 1.1 am größten, die im Schmelzbad 3.3 an der Stelle 9.1 mit Erreichen der Solidustemperatur begann. Mit Beginn dieser Aufschmelzung des Mutterbandes setzt die Verschweißung zwischen dem Mutterband 1.1 und der aufkristallisierten Schicht 3.6 ein.When the coated tape 1 emerges from the bath 3.4 at the point 5, the melted layer 9.2 of the mother tape 1.1 largest, that in the weld pool 3.3 began at point 9.1 when the solidus temperature was reached. With the beginning of this Melting of the mother tape sets the weld between the mother tape 1.1 and the crystallized layer 3.6.

Oberhalb der Schmelze mit Umkehrung des Energiestromes 6 beginnt nun die Erstarrung der Restschmelze in der aufkristallisierten Schicht, bestehend aus den Phasen Schmelze und Kristall, von der Oberfläche des Bandes 1 senkrecht in Richtung Bandmitte sowie in der Oberfläche selber in Richtung Glättrollenpaar 2 parallel zur Gieß- und Walzrichtung 7, d.h. die Oberflächentemperatur des Bandes sinkt, ausgehend von der Badoberfläche 3.4 an der Stelle 5 in Richtung des Glättrollenpaares 2, stetig ab, durchläuft die Solidustemperatur im Punkt 9.3 vor Einlauf 2.1.1 des beschichteten Bandes 1 in das Glättrollenpaar 2, wo sie dann einen Wert annimmt, der unterhalb von T-Solidus liegt.Above the melt with the reversal of the energy flow 6 begins Solidification of the residual melt in the crystallized layer consisting of the Phases melt and crystal, from the surface of the tape 1 perpendicular in Towards the middle of the belt and in the surface itself towards the pair of smoothing rollers 2 parallel to the casting and rolling direction 7, i.e. the surface temperature of the belt decreases, starting from the bath surface 3.4 at point 5 in the direction of Smoothing roller pair 2, continuously, passes through the solidus temperature in point 9.3 Inlet 2.1.1 of the coated tape 1 in the pair of smoothing rollers 2, where they then Assumes a value below T-Solidus.

Außerdem wird die Dicke 1.2 des beschichteten Bandes zwischen der Bandoberfläche 3.4 und dem Beginn der Erstarrung 9.3, also noch im "teigigen" (zwei Phasen: Schmelze und Kristall) Bandoberflächenbereich 24, durch eine Abstreifung 20 auf eine kleinere Dicke 21 reduziert. Diese Reduktion muß vor der Durcherstanung 9.3 erfolgen, um eine saubere und plane Bandoberfläche zu erhalten.In addition, the thickness 1.2 of the coated tape between the tape surface 3.4 and the beginning of solidification 9.3, so still in the "pastry" (two phases: Melt and crystal) band surface area 24, by stripping 20 on a smaller thickness 21 reduced. This reduction must be 9.3 be done to get a clean and flat belt surface.

Diese Abstreifung 20 oder Kontrolle der Beschichtungsdicke kann alternativ sowohl mit einem mechanischen Abstreifer 22 (Messer), der aus Metall und/oder Keramik besteht und auch gekühlt sein kann, als auch mit einem pneumatischen Abstreifer, der mit einem sauerstofffreien Gasstrahl 23 betrieben wird, bestehen.This stripping 20 or control of the coating thickness can alternatively both with a mechanical scraper 22 (knife) made of metal and / or ceramic exists and can also be cooled, as well as with a pneumatic scraper that is operated with an oxygen-free gas jet 23 exist.

Außerdem können beide Arten der Abstreifer 22 und 23 nacheinander zum Einsatz gelangen. Zudem sind beide Abstreifer in ihrer Position, d.h. mit ihrem Abstand zur Bandoberfläche 1.3, zur Badoberfläche 3.4 sowie zueinander frei wählbar.In addition, both types of wipers 22 and 23 can be used sequentially reach. In addition, both wipers are in their position, i.e. with their distance to Belt surface 1.3, to the bath surface 3.4 and to each other freely selectable.

Zur Kontrolle einer gewünschten Temperaturführung des beschichteten Bandes 1 sind die Position 2.4 des Glättrollenpaares 2, der Energiestrom 6 in die Wände mit wärmekontrolliertem Durchgang 6.1 und 6.2 und die Gieß- und Walzgeschwindigkeit 7.1 im Sinne der Erfindung so zu regeln, daß die Oberflächentemperatur des beschichteten Banes 1 vor Eintritt in das Glättrollenpaar 2 sich unterhalb der Solidus-Temperatur befindet und damit das beschichtete Band zumindest in seiner Oberfläche erstarrt ist.To control a desired temperature control of the coated tape 1 are the position 2.4 of the pair of smoothing rollers 2, the energy flow 6 into the walls heat-controlled pass 6.1 and 6.2 and the casting and rolling speed 7.1 to regulate in the sense of the invention so that the surface temperature of the coated banes 1 before entering the smoothing roller pair 2 below the Solidus temperature and thus the coated tape at least in its Surface has solidified.

Diese Bedingung ist für eine rißfreie Oberfläche zwingend notwendig, da die erstarrte Phase besonders unmittelbar unterhalb der Erstarrung ein ausgeprägtes Dehnungsverhalten ohne Rißbildung aufweist. Im Gegensatz zu diesem guten Dehnungsvermögen des Werkstoffes "Stahl" unmittelbar unterhalb des Erstarrungspunktes, T-Solidus, ist es bekannt, daß die Deformationsgrenze im "teigigen" Bereich, im Zwei-Phasengebiet Schmelze/Kristall und damit die Vermeidung von Rissen sehr klein ist und je nach Stahlgüte zwischen 0,1 bis 0,3% liegtThis condition is imperative for a crack-free surface because the solidified Phase, particularly immediately below the solidification, a pronounced elongation behavior without cracking. In contrast to this good elasticity of the material "steel" immediately below the solidification point, T-Solidus, it is known that the deformation limit in the "pasty" area, in the two-phase area Melt / crystal and thus the avoidance of cracks is very small and depending Steel grade is between 0.1 and 0.3%

Bei sogenannten innenrißempfindlichen Stahlgüten also Stählen, die im "teigigen" Bereich bei geringsten Deformationen, d.h. Dehnungsbeanspruchungen zur Rißbildung neigen, ist es für das erfindungsgemäße Verfahren bedeutsam, daß das Erstarrungsprofil 9 an der Phasengrenze fest/flüssig so gesteuert wird, daß die Erstarrung 9.4 des beschichteten Stranges 1 bis spätestens zum Ausgang 2.1.2 und 9A des Walzspaltes bzw. bis spätestens zum Eingang 2.1.1 und 9B in den Walzspalt des Glättrollenpaares 2 beendet ist.In the case of so-called inner-crack-sensitive steel grades, steels that are "pasty" Area with the smallest deformations, i.e. Elongation stresses for crack formation tend, it is important for the inventive method that the Solidification profile 9 at the solid / liquid phase boundary is controlled so that the Solidification 9.4 of the coated strand 1 up to the exit 2.1.2 and 9A of the roll gap or up to the entrance 2.1.1 and 9B at the latest into the roll gap of the pair of smoothing rollers 2 has ended.

Diese Bedingungen des beschichteten Bandes 1 im Glättrollenpaar können, bei vorgegebener Gießgeschwindigkeit 7.1 mit Hilfe der Regelung der Wärmestöme 6 und 2.7 mittels der Wandelemente 6.1 und 6.2 und/oder dem in der Position, zum Abstand vom Gießspiegel 2.4.1 verstellbaren Glättrollenpaar 2 mit Innenkühlung 2.5, eingestellt werden.These conditions of the coated belt 1 in the pair of smoothing rollers can, at predetermined casting speed 7.1 with the help of the regulation of the heat flows 6 and 2.7 by means of the wall elements 6.1 and 6.2 and / or in the position to the distance adjustable leveling roller pair 2 with internal cooling 2.5, set by the mold level 2.4.1 become.

Bei der Sicherstellung eines mindestens im Oberflächenbereich erstarrten Bandes 9.5 im Walzspalt 2.1 mit der gedrückten Länge 2.2 kann nun mit Dickenabnahmen von bis zu 20% durch Anstellung des Glättrollenpaares 2 in Dickenrichtung 2.3 das Band 1 mit seiner rauhen Oberfläche 1.3 gewalzt bzw. geglättet 1.4 werden, ohne daß Oberflächenrisse bzw. Innenrisse in der aufkristallisierten Schicht bei gleichzeitiger Sicherstellung einer guten Verschweißung zwischen Mutterband 1.1 und der aufkristallisierten Schicht 3.6 auftreten. Das so geglättete und plane Band 1.4.1 ist rißfrei in seiner Oberfläche 1.4 und im Inneren seiner erstarrten aufkristallisierten Schicht 3.6. Die Planheit bzw. das entstehende Profil des Bandes 1.4.1 kann unter den oben beschriebenen erfinderischen Merkmalen mit einer Toleranz von max. 2% der Dicke in Quer- und Längsrichtung eingestellt werden.When securing a belt that has solidified at least in the surface area 9.5 in the roll gap 2.1 with the pressed length 2.2 can now with decreases in thickness from to 20% of the belt 1 with the smoothing roller pair 2 in the thickness direction 2.3 its rough surface 1.3 are rolled or smoothed 1.4 without Surface cracks or internal cracks in the crystallized layer with simultaneous Ensuring good welding between the mother tape 1.1 and the Crystallized layer 3.6 occur. The smoothed and flat band 1.4.1 is crack-free in its surface 1.4 and in the interior of its solidified crystallized Layer 3.6. The flatness or the emerging profile of volume 1.4.1 can be found under the inventive features described above with a tolerance of max. 2% the thickness can be set in the transverse and longitudinal directions.

Die Figur 3 stellt den Bereich des Glättrollenpaares 2 etwas mehr im Detail dar. Das beschichtete Band 1 mit seiner Ankristallisation 3.6 läuft in den Walzspalt 2.1.1 mit einer Oberflächentemperatur, T-2.1.1 kleiner als T-Solidus ein (T-2.1.1 < T-sol) und tritt mit einer kontrolliert abgesenkten Temperatur T-2.1.2 kleiner T-2.1.1 (T-2.1.2 < T-2.1.1 < T-sol) aus dem Walzspalt 2.1 an seinem Austritt 2.1.2 heraus. Der Temperaturverlust im Walzspalt sollte kontrolliert und klein gehalten werden. Dies kann erfindungsgemäß durch ein entsprechend wärmedurchgangskontrolliertes Glättrollenpaar 2 mit Innenkühlung 2.5 und wärmekontrollierender Schicht 2.6 oder Schichten erzielt werden.FIG. 3 shows the area of the pair of smoothing rollers 2 in somewhat more detail Coated strip 1 with its crystallization 3.6 runs in the roll gap 2.1.1 a surface temperature, T-2.1.1 less than T-Solidus (T-2.1.1 <T-sol) and occurs with a controlled reduced temperature T-2.1.2 less than T-2.1.1 (T-2.1.2 < T-2.1.1 <T-sol) out of the roll gap 2.1 at its outlet 2.1.2. The Temperature loss in the roll gap should be checked and kept small. This can according to the invention by an appropriately controlled heat transfer Smoothing roller pair 2 with internal cooling 2.5 and heat-controlling layer 2.6 or Layers can be achieved.

Hierzu müssen die Kühlung, die Werkstoffe und die Dicke der Rollen 2, ihr Schichtenaufbau 2.6 und die Wahl der unterschiedlichen Rollen-Werkstoffe wie z.B. Stahl, Metalle, Metallkeramik und/oder Keramik aufeinander abgestimmt werden.For this, the cooling, the materials and the thickness of the rollers 2, you Layer structure 2.6 and the choice of different roller materials such as Steel, metals, metal ceramics and / or ceramics can be coordinated.

Der gesamte Raum 11 oberhalb der Badoberfläche 3.4 ist in seiner Temperatur und Atmosphäre (Stickstoff und/oder Argon) kontrolliert, so daß die oben beschriebenen Bedingungen sichergestellt werden sowie eine Oxidation der Badoberfläche vermieden wird.The entire space 11 above the bath surface 3.4 is in its temperature and Atmosphere (nitrogen and / or argon) controlled so that those described above Conditions are ensured and an oxidation of the bath surface is avoided.

Das so beschichtete Band wird direkt oder indirekt einem weiteren Walzwerk 12 und Walzprozess zur Erzeugung von Fertigwarmband und/oder Kaltband sowohl als Mono-Material als auch als Verbundmaterial mit oder auch ohne vogeschalteter Beize zugeführt.The strip coated in this way is directly or indirectly a further rolling mill 12 and Rolling process for the production of finished hot strip and / or cold strip both as Mono material as well as composite material with or without pre-switched stain fed.

Zur Kontrolle, Steuerung und/oder Regelung des Temperaturfeldes im beschichteten Band 1 und auf der Bandoberfläche 1.3 zwischen der Schmelzbadoberfläche 3.4 und dem Austritt des beschichteten und geglätteten Bandes 1.4.1 aus dem Glättrollenpaar 2 werden Meßgeräte zur Temperaturerfassung 2.8 an der Innenseite der wärmekontrollierten Wandelemente 6.2 angebracht.To control, control and / or regulate the temperature field in the coated Band 1 and on the band surface 1.3 between the melt pool surface 3.4 and the exit of the coated and smoothed belt 1.4.1 from the pair of smoothing rollers 2 are measuring devices for temperature detection 2.8 on the inside of the heat-controlled wall elements 6.2 attached.

Bezugsverzeichnis:Reference list:

1.1.
Beschichtetes Band zwischen der Badoberfläche und dem Glättrollenpaar Coated tape between the bath surface and the pair of smoothing rollers
1.11.1
Mutterband, Ausgangs-MetallbandMother tape, exit metal tape
1.21.2
Dicke des beschichteten Bandes zwischen Badoberfläche und GlättrollenpaarThickness of the coated tape between the bath surface and the pair of smoothing rollers
1.31.3
rauhe, beschichtete Bandoberflächerough, coated belt surface
1.41.4
plane, geglättete Bandoberfächeflat, smoothed belt surface
1.4.11.4.1
beschichtetes und geglättetes Bandcoated and smoothed tape
1.51.5
Antriebsrollenpaar unterhalb des KristallisatorsDrive roller pair below the crystallizer
1.61.6
Detail, siehe Fig. 3For details, see Fig. 3
2.Second
Glättrollenpaarsmoothing roller pair
2.12.1
Walzspaltnip
2.1.12.1.1
Beginn des WalzspaltesBeginning of the roll gap
2.1.22.1.2
Ende des WalzspaltesEnd of the roll gap
2.22.2
gedrückte Länge im Walzspaltpressed length in the roll gap
2.32.3
Position des Glättrollenpaares in Dickenrichtung des Bandes, Walzenanstellung in DickenrichtungPosition of the smoothing roller pair in the thickness direction of the belt, roller adjustment in the thickness direction
2.42.4
Position des Glättrollenpaares in Gieß- und Walzrichtung des BandesPosition of the pair of smoothing rollers in the casting and rolling direction of the strip
2.4.12.4.1
Abstand des Glättrollenpaares zur BadoberflächeDistance of the pair of smoothing rollers to the bath surface
2.52.5
Innenkühlung des GlättrollenpaaresInternal cooling of the pair of smoothing rollers
2.62.6
Beschichtung des Glättrollenpaares zur Kontrolle des WärmeduchgangesCoating of the pair of smoothing rollers to control the heat transfer
2.72.7
Energiestrom in das innengekühlte GlättrollenpaarEnergy flow into the internally cooled pair of smoothing rollers
2.82.8
Meßgerät zur Bestimmung der BandoberflächentemperaturMeasuring device for determining the strip surface temperature
3.Third
KristallisatorCrystallizer
3.13.1
Schmelzenzulaufmelt inlet
3.23.2
Düse der BodeneinlaßvorrichtungNozzle of the floor inlet device
3.33.3
Schmelzbadmelting bath
3.3.13.3.1
Schmelzbadhöhemelting bath
3.43.4
Badoberflächebath surface
3.53.5
Meniskusmeniscus
3.63.6
Ankristallisation von SchmelzeCrystallization of the melt
3.6.13.6.1
Beginn der AnkristallisationStart of crystallization
4.4th
Energiestrom im Schmelzbad aus der Schmelze in das Mutterband Energy flow in the melt pool from the melt into the mother tape
4.14.1
Oberfläche und Profil der Ankristallisation im SchmelzbadSurface and profile of the crystallization in the melt pool
5.5th
Austritt des beschichteten Bandes aus dem BadThe coated tape emerges from the bath
5.15.1
Enddicke der ankristallisierten SchichtFinal thickness of the crystallized layer
6.6th
Energiestrom oberhalb der Badoberfläche nach außen zu den Wänden mit wärmekontrolliertem DurchgangEnergy flow above the bathroom surface to the outside with heat-controlled passage
6.16.1
Wände mit wärmekontrolliertem DrürchgangWalls with heat-controlled passage
6.26.2
wärmedurchgangskontrollierte Wandelemente, unabhängig voneinanderThermally controlled wall elements, independently of each other
7.7th
Gieß- und WalzrichtungCasting and rolling direction
7.17.1
Gieß- und WalzgeschwindigkeitCasting and rolling speed
8.8th.
Oberflächentemperatur, T-x der Ankristallisation im SchmelzbadSurface temperature, T-x of crystallization in the melt pool
9.9th
Isotherme der Solidus-Temperatur, ErstarrungsprofilIsotherm of the solidus temperature, solidification profile
9.19.1
Beginn der Bandoberflächenaufschmelzung und der Verschweißung von Mutterband und AnkristallisationBeginning of band surface melting and welding of Mother bond and crystallization
9.29.2
max. Aufschmelzzone in der Oberfläche des MutterbandesMax. Melting zone in the surface of the mother tape
9.39.3
Beginn der Erstarrung ausgehend von der Bandoberfläche in Richtung Bandmitte, Oberflächentemperatur gleich der Solidus-TemperaturStart of solidification starting from the strip surface in the direction Belt center, surface temperature equal to the solidus temperature
9.49.4
Ende der Erstarrung, DurcherstarrungEnd of solidification, solidification
9.59.5
erstarrte Bandoberflächesolidified belt surface
9.A9.A
Erstarrungsprofil, Isotherme der Solidus-Temperatur, Durcherstarrung bis spätestens zum Ende des WalzspaltesSolidification profile, isotherm of the solidus temperature, solidification up to at the latest at the end of the roll gap
9.B9.B
Erstarrungsprofil, Isotherme der Solidus-Temperatur, Durcherstarrung bis spätestens zum Eintritt in der WalzspaltSolidification profile, isotherm of the solidus temperature, solidification up to at the latest when they enter the roll gap
10.10th
Isotherme der Liquidus-TemperaturIsotherm of the liquidus temperature
11.11th
temperatur- und atmosphärenkontrollierter Raum oberhalb des SchmelzbadesTemperature and atmosphere controlled room above the melting bath
12.12th
direkt weiterverarbeitendes Walzwerkdirectly processing rolling mill
2020
Abstreifung der Ankristallisation (3.6) mit einer Dicke (1.2 auf eine kleinere Dicke (21)Stripping of the crystallization (3.6) with a thickness (1.2 to a smaller one Thick (21)
2121
kleinere Dicke der Ankristallisation (3.6) mit einer Dicke (1.2)smaller thickness of the crystallization (3.6) with a thickness (1.2)
2222
mechanische Abstreifung, beispielsweise mit einem Messermechanical stripping, for example with a knife
22.122.1
mechanische Abstreifvorrichtung, Messermechanical scraper, knife
22.222.2
pneumatische Abstreifvorrichtungpneumatic scraper
2323
pneumatische Abstreifung, beispielsweise mit einem sauerstoffreien Gasstrahl (23.1)pneumatic wiping, for example with an oxygen-free gas jet (23.1)
2424
"teigiger" Bandoberflächenbereich (zwei Phasen: Schmelze und Kristall) zwischen Badoberfläche (1.3) und dem Beginn der Erstarrung (9.3) in der Bandoberfläche (1.3)."doughy" band surface area (two phases: melt and crystal) between bath surface (1.3) and the beginning of solidification (9.3) in the Belt surface (1.3).

Claims (7)

  1. Method of producing coated strands of metal, especially strips (1) of steel, in which a metal strand (1) is guided through the base of a vessel (3) filled with melt (3.3) of the same or different composition as the metal strand (1.1), wherein the dwell time of the metal strand (1.1) is so selected in dependence on the melt bath level (3.3.1), the casting speed, the metal strand temperature and the preheating temperature of the metal strand that the deposited melt on the metal strand adopts a desired thickness of a multiple of the starting thickness of the metal strand and the metal strand (1) with crystallised-on layer (3.6) undergoes a smoothing pass (2) after exit from the melt bath (3.3) and the smoothing pass is carried out when the surface temperature of the crystallised-on strand (3.6) is lower than the solidus temperature of the melt bath (3) and thus at least the surface (1.3) of the crystallised-on layer (3.6) has hardened, characterised in that a stripping down (20) of the crystallised-on layer (3.6) with a thickness (1.2) to a smaller thickness (21) takes place between the melt bath (3.4) and the beginning of the hardening (9.3).
  2. Method according to claim 1, characterised in that the stripping down (20) is carried out mechanically, for example by a knife (22.1).
  3. Method according to claim 1 and/or 2, characterised in that the stripping down (20) is carried out pneumatically (23), for example by an oxygen-free gas jet (23.1).
  4. Device for carrying out the method according to claim 1 to 3, comprising a melt vessel, a crystallisator (3), through the base of which a mother strip (1.1) enters by means of a drive roller pair with formation of a meniscus (3.5) in the region of the base inlet device (3.2), and a space (11) above the melt bath (3.3), in which a smoothing roller pair (2) with a roll gap (2.1) for guidance through of the metal strand (1) with crystallised-on layer (3.6) hardened at the surface thereof is arranged, wherein a stripping-down (20) (3.6) of the crystallised-on layer with a thickness (1.2) to a smaller thickness (21) is provided between the melt bath (3.4) and the beginning of the hardening (9.3) at the strip surface (1.3) and the smoothing roller pair (2) and the walls of the space (1) are each constructed to be heat-controlled.
  5. Device according to claim 4, characterised in that the stripping-down (20) is constructed as a mechanical stripping-down device (knife 22.1).
  6. Device according to claim 4 and/or 5, characterised in that the stripping-down (20) is constructed as a pneumatic stripping-down device (23.1).
  7. Device according to one of claims 4 to 6, characterised in that the stripping-down devices (22.1 and/or 23.1) are arranged to be variable in their position, i.e. their spacing from the bath (3.4) and the bath surface (1.3).
EP00901068A 1999-01-20 2000-01-07 Method and device for producing coated metal strands, especially steel strips Expired - Lifetime EP1144705B1 (en)

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DE19902066A DE19902066A1 (en) 1999-01-20 1999-01-20 Method and device for producing coated strands of metal, in particular steel strips
DE19902066 1999-01-20
PCT/EP2000/000060 WO2000043563A2 (en) 1999-01-20 2000-01-07 Method and device for producing coated metal strands, especially steel strips

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EP1144705B1 true EP1144705B1 (en) 2002-06-12
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EP (1) EP1144705B1 (en)
AT (1) ATE219160T1 (en)
AU (1) AU2106200A (en)
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DE102005030766A1 (en) * 2005-07-01 2007-01-04 Sms Demag Ag Device for the hot dip coating of a metal strand

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1621339A1 (en) * 1967-04-29 1971-06-03 Siemens Ag Process for the production of copper wire coated with tin or a predominantly tin-containing alloy, in particular copper jumper wire, by hot-dip metallization
US4339480A (en) * 1980-04-11 1982-07-13 Bethlehem Steel Corporation Gas wiping apparatus and method of using
DE3600548A1 (en) 1986-01-10 1987-07-16 Alfred Haderlapp Apparatus for the tin-plating of rod-shaped objects
DE4319569C1 (en) * 1993-06-08 1994-06-16 Mannesmann Ag Method and appts. for prodn. of a semi-finished prod. - with smooth-rolling of the deposited metal ensures a small thickness tolerance
DE19509681C1 (en) 1995-03-07 1996-05-02 Mannesmann Ag Continuous prodn. of metal strip by inversion casting
DE19638906C1 (en) * 1996-09-23 1998-01-02 Schloemann Siemag Ag Production of continuous coated metal products, in particular metal strips
DE19638905C1 (en) * 1996-09-23 1998-01-02 Schloemann Siemag Ag Production of continuous coated metal products, in particular, metal strips
CA2225537C (en) * 1996-12-27 2001-05-15 Mitsubishi Heavy Industries, Ltd. Hot dip coating apparatus and method
US6037011A (en) * 1997-11-04 2000-03-14 Inland Steel Company Hot dip coating employing a plug of chilled coating metal

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AU2106200A (en) 2000-08-07
DE19902066A1 (en) 2000-08-03
ATE219160T1 (en) 2002-06-15
DE50000212D1 (en) 2002-07-18
WO2000043563A3 (en) 2002-09-26
US6565925B1 (en) 2003-05-20
WO2000043563A2 (en) 2000-07-27
EP1144705A3 (en) 2002-11-13
EP1144705A2 (en) 2001-10-17

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