EP1144705A2 - Procede et dispositif pour produire des bandes de metal, notamment des feuillards d'acier, munies d'un revetement - Google Patents

Procede et dispositif pour produire des bandes de metal, notamment des feuillards d'acier, munies d'un revetement

Info

Publication number
EP1144705A2
EP1144705A2 EP00901068A EP00901068A EP1144705A2 EP 1144705 A2 EP1144705 A2 EP 1144705A2 EP 00901068 A EP00901068 A EP 00901068A EP 00901068 A EP00901068 A EP 00901068A EP 1144705 A2 EP1144705 A2 EP 1144705A2
Authority
EP
European Patent Office
Prior art keywords
thickness
metal strand
stripping
bath
melt
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
EP00901068A
Other languages
German (de)
English (en)
Other versions
EP1144705B1 (fr
EP1144705A3 (fr
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
SMS Schloemann Siemag AG
Schloemann Siemag 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 SMS Schloemann Siemag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Publication of EP1144705A2 publication Critical patent/EP1144705A2/fr
Application granted granted Critical
Publication of EP1144705B1 publication Critical patent/EP1144705B1/fr
Publication of EP1144705A3 publication Critical patent/EP1144705A3/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/008—Continuous 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0035—Means for continuously moving substrate through, into or out of the bath
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0036—Crucibles
    • C23C2/00361—Crucibles characterised by structures including means for immersing or extracting the substrate through confining wall area
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/50—Controlling or regulating the coating processes

Definitions

  • the invention relates to a method and a device for producing coated strands of metal, in particular steel strips, in which a metal strand is passed through the bottom of a vessel filled with melt of the same or different composition as the metal strand, the residence time of the Metal strand depending on the molten pool height, the casting speed, the metal strand thickness and the preheating temperature of the metal strand is selected so that the deposited melt on the metal strand assumes a desired thickness of several times the initial thickness of the metal strand and the metal strand with crystallized layer after exiting the Melt 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 is solidified.
  • the belt then experiences severe hypothermia as it passes through the pair of smoothing rollers, which causes the tendency to crack both along and across the belt direction. This danger increases with higher casting and rolling speeds.
  • the smoothing stitch is therefore carried out there 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. Nevertheless, it cannot be ruled out that the thickness of the crystallized layer fluctuates.
  • the invention is therefore based on the object of providing a method and a device which ensure smoothing of the strip with a strip thickness tolerance of at most 2% without cracking both in the surface and in the interior of the strip while controlling the thickness of the crystallization.
  • the main features for producing defect-free, flat-coated strips for example with a width / thickness ratio greater than 60 and a total thickness of at most 12 mm, preferably 2 to 6 mm, from one material or from composite materials of different metal qualities such as carbon steel as 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 maximum thickness deviation of 2% between the edge (40 mm from the edge) and the center of the strip are the same with regard to the desired goal Thickness of the crystallized layer in particular characterized in that between the molten bath and the start of solidification on the strip surface, the crystallization is stripped to a smaller thickness with a desired thickness. In the end, only as much material is stripped or carried as is necessary to make the same To achieve the thickness of the crystallized layer over the length of the strand. The excess of the crystallized layer is thus stripped off.
  • the stripping of the crystallization with a desired thickness to a smaller thickness is advantageously carried out in the device between the molten bath and the start of solidification on the strip surface, the walls of the space accommodating the pair of smoothing rollers and the pair of smoothing rollers themselves being designed to be heat-controlled.
  • Mechanical stripping devices in the form of preferably knives are advantageously suitable for stripping, alternatively a pneumatic stripping device can be used.
  • Figure 1 is an overall view of the method and its device for smoothing coated strands of metal, preferably steel strips;
  • FIG. 2 shows a temperature field of the strand between the strip entry into the crystallizer and the pair of smoothing rollers during casting
  • FIG. 3 shows a coated strip between the melt pool surface in the crystallizer and the pair of smoothing rollers, detail from FIG. 1.
  • FIGS. 1 and 2 show the overall view of the method and the device for smoothing coated strands, preferably strips of steel 1, using a pair of smoothing rollers 2.
  • the mother tape 1.1 is in the crystallizer 3, filled with melt 3.3, which is introduced via a melt inlet 3.1, through the nozzles of 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 Promoted crystal lisators.
  • the mother tape 1.1 With a temperature of either 20 to 80 ° C before entering the crystallizer 3, begins above the steel meniscus 3.5 at the nozzle outlet 3.2 with the crystallization 3.6 of melt in point 3.6.1 and removes the melt 3.3 from superheating and crystallization energy simultaneous warming.
  • This energy flow 4 from the melt into the mother tape takes place when the mother tape passes 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.
  • the coated strip 1 At the exit 5 of the coated strip 1 from the bath surface 3.4 of the melt pool with a surface roughness 1.3, it has reached a certain thickness 1.2, which is essentially determined by the strip temperature when it enters the crystallizer, the melt temperature and the contact time of the strip with the melt , with which the strip 1 enters the roll gap 2.1 of the pair of smoothing rollers 2.
  • the strip 1 coated in this way is "doughy" at the exit 5 from the bath 3.4 on the surface (two phases: melt and crystal) and has a surface roughness 1.3 of greater than 2%, which meets the flatness criteria of a strip with a width / thickness Ratio greater than 60 does not do it justice.
  • the solidification runs from the exit 5 to the pair of smoothing rollers 2 and beyond in the crystallized layer, which consists of melt and crystal, from the outside in, ie the energy flow 6 reverses compared to the heat flow 4 in the melt 3.3 um and runs from the inside (middle of the strip) to the outside into the walls 6.1 with a heat-controlled passage.
  • This controlled heat flow can be divided by wall elements 6.2 into zones corresponding to the temperature control of the strip 1 in the casting and rolling direction 7.
  • the crystallization 3.6 in the bath 3.3 has on its surface 4.1 a temperature 8 (Tx) which is greater than the solidus temperature and lower than the liquidus temperature (T-Ii> Tx> T-sol) and has a two-phase state , consisting of melt and crystal. This crystallization steadily decreases in temperature from the surface perpendicular to the mother tape 1.1. Functional to the surface profile 4.1 of the crystallization 3.6, the liquidus isotherm 10 runs in the molten bath up to the bath surface 3.4.
  • Tx temperature 8
  • T-Ii> Tx> T-sol liquidus temperature
  • the coated strip 1 emerges from the bath 3.4 at point 5
  • the melted layer 9.2 of the mother strip 1.1 is largest, which began in the melt bath 3.3 at point 9.1 when the solidus temperature was reached.
  • the welding between the mother tape 1.1 and the crystallized layer 3.6 begins.
  • the solidification of the residual melt in the crystallized layer begins from the surface of the strip 1 perpendicular to the strip center and in the surface itself in the direction of the pair of smoothing rollers 2 parallel to the casting and rolling direction 7, ie the surface temperature of the strip decreases steadily from the bath surface 3.4 at point 5 in the direction of the pair of smoothing rollers 2, the solidus temperature passes through in point 9.3 Inlet 2.1.1 of the coated belt 1 into the pair of smoothing rolls 2, where it then assumes a value which is below T-Solidus.
  • the thickness 1.2 of the coated strip between the strip surface 3.4 and the start of solidification 9.3, that is to say still in the "pasty" (two phases: melt and crystal) strip surface area 24, is reduced to a smaller thickness 21 by a stripping 20. This reduction must take place before solidification 9.3 in order to obtain a clean and flat belt surface.
  • This stripping 20 or control of the coating thickness can alternatively exist both with a mechanical stripper 22 (knife), which is made of metal and / or ceramic and can also be cooled, as well as with a pneumatic stripper, which is operated with an oxygen-free gas jet 23 .
  • both types of wipers 22 and 23 can be used in succession.
  • both wipers are in their position, i.e. with their distance to the belt surface 1.3, to the bath surface 3.4 and to each other freely selectable.
  • the position 2.4 of the pair of smoothing rollers 2 the energy flow 6 into the walls with heat-controlled passageways 6.1 and 6.2 and the pouring and rolling speed 7.1 in the sense of the invention are to be controlled in such a way that the surface temperature of the coated strip 1 before entering the pair of smoothing rollers 2 is below the solidus temperature and thus the coated strip is at least solidified in its surface.
  • These conditions of the coated belt 1 in the pair of smoothing rollers can, at a given 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 the smoothing roller pair 2 with internal cooling 2.5 adjustable in relation to the distance from the casting level 2.4.1 , can be set.
  • the strip 1 with its rough surface 1.3 can now be rolled or smoothed 1.4 with a decrease in thickness of up to 20% by adjusting the pair of smoothing rollers 2 in the thickness direction 2.3, without surface cracks or internal cracks occurring in the crystallized layer while at the same time ensuring good welding between the mother tape 1.1 and the crystallized layer 3.6.
  • the thus 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 resulting profile of the band 1.4.1 can be a tolerance of max. 2% of the thickness can be set in the transverse and longitudinal directions.
  • FIG. 3 shows the area of the pair of smoothing rollers 2 in somewhat more detail.
  • the 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 controlled and kept small. According to the invention, this can be achieved by means of a correspondingly heat-controlled, controlled pair of smoothing rollers 2 with internal cooling 2.5 and heat-controlling layer 2.6 or layers.
  • the cooling, the materials and the thickness of the rollers 2, their 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 controlled in its temperature and atmosphere (nitrogen and / or argon), so that the conditions described above are ensured and oxidation of the bath surface is avoided.
  • the strip coated in this way is fed directly or indirectly to a further rolling mill 12 and rolling process for producing finished hot strip and / or cold strip both as a mono material and as a composite material with or without an upstream pickling line.

Landscapes

  • 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

L'invention concerne un procédé permettant de produire des joncs de métal munis d'un revêtement, notamment des feuillards (1) d'acier. Selon ce procédé, un jonc de métal (1.1) est guidé à travers le fond d'une cuve (3) remplie de matière fondue (3.3) de composition identique ou différente à(de) celle du jonc de métal (1.1). Le temps de séjour du jonc de métal (1.1) est choisi en fonction du niveau du bain de matière fondue (3.3.1), de la vitesse de coulée, de l'épaisseur du jonc de métal et de la température de préchauffage du jonc de métal, de manière que la matière fondue déposée sur le jonc de métal adopte une épaisseur voulue du multiple de l'épaisseur initiale dudit jonc de métal et qu'à sa sortie du bain de matière fondue (3.3), ledit jonc de métal (1.1) muni de la couche (3.6) cristallisée dessus soit soumis à une coulée lisse (2) qui intervient lorsque la température en surface du jonc (3.6) munie de la couche cristallisée dessus, est inférieure à la température dite </= Solidus >/= du bain de matière fondue (3.3). Au moins la surface (1.3) de la couche (3.6) déposée par cristallisation se solidifie. On obtient une épaisseur contrôlée de la couche déposée par cristallisation si entre le bain de matière fondue (3.4) et le début de la solidification (9.3) sur la surface de la bande (1.3) d'une épaisseur (1.2), on procède à une diminution de la couche déposée par cristallisation (3.6), pour parvenir à une épaisseur (21) moindre.
EP00901068A 1999-01-20 2000-01-07 Procede et dispositif pour produire des bandes de metal, notamment des feuillards d'acier, munies d'un revetement Expired - Lifetime EP1144705B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19902066A DE19902066A1 (de) 1999-01-20 1999-01-20 Verfahren und Vorrichtung zur Erzeugung von beschichteten Strängen aus Metall, insbesondere von Bändern aus Stahl
DE19902066 1999-01-20
PCT/EP2000/000060 WO2000043563A2 (fr) 1999-01-20 2000-01-07 Procede et dispositif pour produire des joncs de metal munis d'un revetement, notamment des feuillards d'acier

Publications (3)

Publication Number Publication Date
EP1144705A2 true EP1144705A2 (fr) 2001-10-17
EP1144705B1 EP1144705B1 (fr) 2002-06-12
EP1144705A3 EP1144705A3 (fr) 2002-11-13

Family

ID=7894810

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00901068A Expired - Lifetime EP1144705B1 (fr) 1999-01-20 2000-01-07 Procede et dispositif pour produire des bandes de metal, notamment des feuillards d'acier, munies d'un revetement

Country Status (6)

Country Link
US (1) US6565925B1 (fr)
EP (1) EP1144705B1 (fr)
AT (1) ATE219160T1 (fr)
AU (1) AU2106200A (fr)
DE (2) DE19902066A1 (fr)
WO (1) WO2000043563A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005030766A1 (de) * 2005-07-01 2007-01-04 Sms Demag Ag Vorrichtung zur Schmelztauchbeschichtung eines Metallstranges

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1621339A1 (de) * 1967-04-29 1971-06-03 Siemens Ag Verfahren zum Herstellen von mit Zinn oder einer ueberwiegend zinnhaltigen Legierung ueberzogenem Kupferdraht,insbesondere Kupferschaltdraht,durch Feuermetallisieren
US4339480A (en) * 1980-04-11 1982-07-13 Bethlehem Steel Corporation Gas wiping apparatus and method of using
DE3600548A1 (de) 1986-01-10 1987-07-16 Alfred Haderlapp Vorrichtung zum verzinnen von stabfoermigen gegenstaenden
DE4319569C1 (de) * 1993-06-08 1994-06-16 Mannesmann Ag Verfahren und Vorrichtung zur Erzeugung von Halbzeug
DE19509681C1 (de) 1995-03-07 1996-05-02 Mannesmann Ag Verfahren und Anlage zur kontinuierlichen Erzeugung bandförmiger Bleche
DE19638905C1 (de) * 1996-09-23 1998-01-02 Schloemann Siemag Ag Verfahren zur Erzeugung von beschichteten Metallsträngen, insbesondere Metallbändern und Beschichtungsanlage
DE19638906C1 (de) * 1996-09-23 1998-01-02 Schloemann Siemag Ag Verfahren und Vorrichtung zur Erzeugung von beschichteten Strängen aus Metall, insbesondere von Bändern aus Stahl
CA2225537C (fr) * 1996-12-27 2001-05-15 Mitsubishi Heavy Industries, Ltd. Dispositif et methode de revetement metallique a chaud
US6037011A (en) * 1997-11-04 2000-03-14 Inland Steel Company Hot dip coating employing a plug of chilled coating metal

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0043563A2 *

Also Published As

Publication number Publication date
WO2000043563A3 (fr) 2002-09-26
US6565925B1 (en) 2003-05-20
DE50000212D1 (de) 2002-07-18
ATE219160T1 (de) 2002-06-15
AU2106200A (en) 2000-08-07
DE19902066A1 (de) 2000-08-03
EP1144705B1 (fr) 2002-06-12
WO2000043563A2 (fr) 2000-07-27
EP1144705A3 (fr) 2002-11-13

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