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EP2389260B1 - Method and device for annealing and descaling strips of stainless steel - Google Patents

Method and device for annealing and descaling strips of stainless steel Download PDF

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Publication number
EP2389260B1
EP2389260B1 EP09837223.8A EP09837223A EP2389260B1 EP 2389260 B1 EP2389260 B1 EP 2389260B1 EP 09837223 A EP09837223 A EP 09837223A EP 2389260 B1 EP2389260 B1 EP 2389260B1
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EP
European Patent Office
Prior art keywords
descaling
strip
plasma
annealing
steel strip
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.)
Not-in-force
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EP09837223.8A
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German (de)
French (fr)
Other versions
EP2389260A2 (en
Inventor
Holger Behrens
Klaus Frommann
Hans-Georg Hartung
Matthias Kretschmer
Lutz Kümmel
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SMS Group GmbH
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SMS Group GmbH
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Publication of EP2389260A2 publication Critical patent/EP2389260A2/en
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Publication of EP2389260B1 publication Critical patent/EP2389260B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/06—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing of strip material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless steel

Definitions

  • the invention relates to a method for annealing and descaling hot-rolled or cold-rolled strip of stainless steel.
  • the steel strip For further processing of both hot rolled and cold rolled stainless steel strip, e.g. B. by cold rolling in the hot strip and for the production of the final products in the cold strip, the steel strip must be annealed and have a scale-free surface. Therefore, the scale formed during hot rolling or annealing must be completely removed.
  • the annealing and descaling of stainless steel strip except ferritic hot strip is done in the known methods in-line in combined annealing and pickling lines.
  • the annealing of hot strip or austenitic stainless steel cold strip and ferritic stainless steel cold strip is carried out in a horizontal continuous furnace followed by a cooling zone to cool the strip to temperatures below 100 ° C
  • Hot-rolled strip of ferritic stainless steel is subject to metallurgical reasons outside the annealing and pickling line as a bundle of long-term bonnet annealing with subsequent air cooling by the federal government.
  • the descaling of this material is usually carried out in the above-mentioned combined annealing and pickling lines, whereby only the descaling is required because of the already performed annealing, or in special pickling lines without annealing furnace.
  • the strip is first mechanically descaled by blasting with steel grain and brushing, whereby a large part of the scale is removed. Thereafter, it is pickled electrolytically and then chemically by means of various acids at elevated temperatures, the remaining scale being completely removed becomes.
  • a mechanical descaling is not necessary because of the much thinner scale layer, and thus the roughness is increased too much.
  • the z. Z. used methods are very complicated because the scale layer is relatively thick in the hot strip and the chromium-rich iron oxides are difficult to dissolve and therefore difficult to remove. In addition, a great deal of effort is required for the disposal of used acids, wastewater and toxic gases produced during pickling.
  • a new environmentally friendly process for the descaling of stainless steel strip is the plasma technology, It is exemplified on the EP 1 814 678 B1 , on the WO 00/056949 A1 and on the RU 2 145 912 C1 pointed.
  • the steel strip to be descaled passes between special electrodes located in a vacuum chamber. The descaling is carried out by the plasma located between the electrodes and the steel strip, and after completion of the descaling process a metallically clean strip surface is present.
  • the steel strip is cooled in a vacuum by means of cooling rollers, in order to reduce the band heating arising during plasma descaling to a maximum temperature of 100 ° C. before exiting the vacuum chamber.
  • the object of the invention is to improve this plasma descaling for use with stainless steel strip.
  • the plasma technology represents, in particular for stainless steel strip, an environmentally friendly, qualitatively perfect and economic descaling technology.
  • the cooled hot-rolled strip can be used in a combined annealing and descaling line or cold rolled stainless steel strip alone with the plasma technology completely descaled.
  • a variant for austenitic and ferritic stainless steel strip is the combination of pre-descaling by blasting with steel grain followed by plasma descaling, which greatly reduces the process time required for plasma descaling.
  • a device for annealing and descaling of stainless steel strip is shown schematically.
  • the steel strip 1 is unwound from a discharge reel 11. With the welding machine 12, the band ends of the following bundles are welded together. Thereafter, the tape passes through a tape storage 13, from there via an S-roll stand 14 for generating the strip tension, of this by the horizontal annealing furnace 2, in which it is briefly annealed at temperatures up to 1200'C. After annealing, the steel strip 1 passes through the cooling zone 3, where it is cooled with air or air and water spray to temperatures below 100 ° C. Thereafter, the steel strip 1 runs in the transport direction R about the guide roller 15 and over the S-roller stand 16 by the stretch bending device 4 for producing a flat strip. From there it passes through the steel grain blasting device 5. This can be used to pre-descaling hot rolled stainless steel strip 1. The Stahlkom-blasting device 5 is not required with correspondingly more powerful design of the following plasma descaling system 6.
  • the steel hand 1 then passes through a further S-roll stand 17, which is required to produce the strip tension, through a multi-stage vacuum lock 7 into the process chamber 8 of the plasma descaling unit 6, in which the plasma descaling takes place.
  • electrodes 9 for generating the plasma are arranged over the entire bandwidth at a predetermined distance from the band.
  • the plasma descaling system 6 shown schematically here has 2 Process chambers 8. Depending on the performance of the system, the number and length of the process chambers 8 may be different. Between the process chambers, a cooling zone is arranged with adjustable cooling rollers 10 for belt cooling, which are also in a vacuum.
  • the steel strip is preferably cooled with the cooling rollers 10 to a temperature below 100 ° C and then passes through the second process chamber 8, in which also above and below the steel strip 1 electrodes for generating the plasma are arranged. In this process chamber, the complete removal of the remaining scale on both sides of the steel strip takes place. Thereafter, the descaled steel strip passes through the second cooling zone with 3 cooling rollers 10, in which it is cooled to a temperature below 100 ° C. From there it runs through the multi-stage vacuum lock 7 and then enters the air atmosphere.
  • the steel belt 1 runs to the take-up reel 20, where it is wound up into the finished collar 21.
  • the described method and apparatus for annealing and descaling stainless steel strip provides an economically and environmentally very advantageous technology for producing high quality stainless steel strip which meets the requirements of the market.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Cleaning In General (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Glühen und Entzundern von warmgewalzten oder kaltgewalzten Band aus nichtrostendem Stahl.The invention relates to a method for annealing and descaling hot-rolled or cold-rolled strip of stainless steel.

Für die Weiterverarbeitung sowohl von warmgewalzten als auch von kaltgewalzten Band aus nichtrostendem Stahl, z. B. durch Kaltwalzen beim Warmband und für die Herstellung der Endprodukte beim Kaltband, muss das Stahlband geglüht werden und eine zunderfreie Oberfläche haben. Daher muss der beim Warmwalzen bzw. beim Glühen entstandene Zunder vollständig entfernt werden. Das Glühen und Entzundem von nichtrostendem Stahlband außer ferritischen Warmband erfolgt bei den bekannten Verfahren in-line in kombinierten Glüh- und Beizlinien. Das Glühen von Warmband oder Kaltband aus austenitischen nichtrostenden Stahl sowie von Kaltband aus ferritischen nichtrostenden Stahl erfolgt in einem horizontalen Durchlaufofen mit anschließender Kühlzone zur Abkühlung des Bandes auf Temperaturen unter 100 °CFor further processing of both hot rolled and cold rolled stainless steel strip, e.g. B. by cold rolling in the hot strip and for the production of the final products in the cold strip, the steel strip must be annealed and have a scale-free surface. Therefore, the scale formed during hot rolling or annealing must be completely removed. The annealing and descaling of stainless steel strip except ferritic hot strip is done in the known methods in-line in combined annealing and pickling lines. The annealing of hot strip or austenitic stainless steel cold strip and ferritic stainless steel cold strip is carried out in a horizontal continuous furnace followed by a cooling zone to cool the strip to temperatures below 100 ° C

Warmband aus ferritischen nichtrostenden Stahl wird dagegen aus metallurgischen Gründen außerhalb der Glüh- und Beizlinie als Bund einer Langzeit-Haubenglühung mit nachfolgender Luftabkühlung des Bundes unterzogen. Die Entzunderung dieses Materials erfolgt üblicherweise in den oben genannten kombinierten Glüh- und Beizlinien, wobei wegen der bereits erfolgten Haubenglühung nur die Entzunderung erforderlich ist, oder in speziellen Beizlinien ohne Glühofen.Hot-rolled strip of ferritic stainless steel, on the other hand, is subject to metallurgical reasons outside the annealing and pickling line as a bundle of long-term bonnet annealing with subsequent air cooling by the federal government. The descaling of this material is usually carried out in the above-mentioned combined annealing and pickling lines, whereby only the descaling is required because of the already performed annealing, or in special pickling lines without annealing furnace.

Besonders die Entzunderung von warmgewalztem nichtrostenden austenitischen und ferritischen Stahlband ist sehr aufwändig, wozu bei den bekannten Verfahren mehrere Stufen erforderlich sind. Dabei wird das Band zunächst durch Strahlen mit Stahlkorn und durch Bürsten mechanisch vorentzundert, womit ein großer Teil des Zunders entfernt wird. Danach wird es elektrolytisch und anschließend chemisch mittels verschiedener Säuren bei erhöhten Temperaturen gebeizt, wobei der noch vorhandene Zunder vollständig entfernt wird. Bei kaltgewalzten Band aus austenitischen und ferritischen nichtrostenden Stahl ist eine mechanische Vorentzunderung wegen der wesentlich dünneren Zunderschicht nicht erforderlich, außerdem wird damit die Rauheit zu stark erhöht.Especially the descaling of hot-rolled stainless austenitic and ferritic steel strip is very complicated, for which several steps are required in the known methods. In this case, the strip is first mechanically descaled by blasting with steel grain and brushing, whereby a large part of the scale is removed. Thereafter, it is pickled electrolytically and then chemically by means of various acids at elevated temperatures, the remaining scale being completely removed becomes. For cold-rolled strip of austenitic and ferritic stainless steel, a mechanical descaling is not necessary because of the much thinner scale layer, and thus the roughness is increased too much.

Die z. Z. benutzten Verfahren sind sehr aufwändig, weil die Zunderschicht beim Warmband relativ dick ist und die chromreichen Eisenoxide schwer löslich und deshalb schwer zu entfernen sind. Außerdem ist ein großer Aufwand für die Entsorgung der gebrauchten Säuren, der Abwässer und der beim Beizen entstehenden giftigen Abgase erforderlich.The z. Z. used methods are very complicated because the scale layer is relatively thick in the hot strip and the chromium-rich iron oxides are difficult to dissolve and therefore difficult to remove. In addition, a great deal of effort is required for the disposal of used acids, wastewater and toxic gases produced during pickling.

Die Entzunderung von nichtrostendem Stahlband ist nach wie vor mit Umweltbelastungen verbunden, deren Minimierung mit hohen Kosten verbunden ist.The descaling of stainless steel strip is still associated with environmental pollution, the minimization of which is associated with high costs.

Ein neues umweltfreundliches Verfahren zur Entzunderung von Band aus nichtrostendem Stahl ist die Plasma-Technologie, Es wird exemplarisch auf die EP 1 814 678 B1 , auf die WO 00/056949 A1 und auf die RU 2 145 912 C1 hingewiesen.
Bei der dort offenbarten Plasma-Entzunderungstechnologie läuft das zu entzundernde Stahlband zwischen speziellen Elektroden, die sich in einer Vakuumkammer befinden. Die Entzunderung erfolgt durch das zwischen Elektroden und Stahlband befindliche Plasma, wobei nach Beendigung des Entzunderungsprozesses eine metallisch saubere Bandoberfläche vorhanden ist.
Nach der Plasmaentzunderung wird das Stahlband im Vakuum mittels Kühlrollen gekühlt, um die bei der Plasmaentzunderung entstehende Banderwärmung vor dem Austritt aus der Vakuumkammer auf eine Temperatur von maximal 100 °C zu reduzieren.A new environmentally friendly process for the descaling of stainless steel strip is the plasma technology, It is exemplified on the EP 1 814 678 B1 , on the WO 00/056949 A1 and on the RU 2 145 912 C1 pointed.
In the plasma descaling technology disclosed therein, the steel strip to be descaled passes between special electrodes located in a vacuum chamber. The descaling is carried out by the plasma located between the electrodes and the steel strip, and after completion of the descaling process a metallically clean strip surface is present.
After plasma descaling, the steel strip is cooled in a vacuum by means of cooling rollers, in order to reduce the band heating arising during plasma descaling to a maximum temperature of 100 ° C. before exiting the vacuum chamber.

Aufgabe der Erfindung ist es, diese Plamaentzunderung für den Einsatz bei Band aus nichtrostendem Stahl zu verbessern.The object of the invention is to improve this plasma descaling for use with stainless steel strip.

Gelöst wird diese Aufgabe erfindungsgemäß mit den Merkmalen der Patentansprüche 1, 2 und 4 sowie mit einer Vorrichtung zur Durchführung der Verfahren nach Anspruch 8.This object is achieved according to the invention with the features of claims 1, 2 and 4 and with a device for carrying out the method according to claim 8.

Weitere Ausgestaltungen ergeben sich aus den Unteransprüchen.Further embodiments emerge from the subclaims.

Die Plasma-Technologie stellt insbesondere für Band aus nichtrostendem Stahl eine umweltfreundliche, qualitativ einwandfreie und wirtschaftliche Technologie der Entzunderung dar. In einer kombinierten Glüh- und Entzunderungslinie kann das gekühlte warmgewalzte oder kaltgewalzte Band aus nicht rostendem Stahl allein mit der Plasma-Technologie vollständig entzundert werden. Eine Variante für warmgewalztes Band aus austenitischen und ferritischen nichtrostendem Stahl ist die Kombination der Vorentzunderung durch Strahlen mit Stahlkorn mit nachfolgender Plasmaentzunderung, womit die für die Plasmaentzunderung erforderliche Prozesszeit stark reduziert werden kann.The plasma technology represents, in particular for stainless steel strip, an environmentally friendly, qualitatively perfect and economic descaling technology. In a combined annealing and descaling line, the cooled hot-rolled strip can be used in a combined annealing and descaling line or cold rolled stainless steel strip alone with the plasma technology completely descaled. A variant for austenitic and ferritic stainless steel strip is the combination of pre-descaling by blasting with steel grain followed by plasma descaling, which greatly reduces the process time required for plasma descaling.

Für kaltgewalztes Band aus nichtrostendem Stahl kommt eine mechanische Vorentzunderung nicht in Frage, weil die Zunderschicht wesentlich dünner ist als bei warmgewalzten Band.For cold-rolled strip of stainless steel, a mechanical descaling is out of the question, because the scale layer is much thinner than hot-rolled strip.

Die Erfindung soll nachfolgend mit Bezug auf die Zeichnung erläutert werden.The invention will be explained below with reference to the drawing.

In Fig. 1 ist eine Vorrichtung zum Glühen und Entzundern von nichtrostendem Stahlband schematisch dargestellt.In Fig. 1, a device for annealing and descaling of stainless steel strip is shown schematically.

Das Stahlband 1 wird dabei von einem Ablaufhaspel 11 abgewickelt. Mit der Schweißmaschine 12 werden die Bandenden der jeweils folgenden Bunde aneinander geschweißt. Danach läuft das Band durch einen Bandspeicher 13, von dort über einen S-Rollenstand 14 zur Erzeugung des Bandzuges, von diesem durch den horizontalen Glühofen 2, in welchem es kurzeitig bei Temperaturen bis zu maximal 1200'C geglüht wird. Nach dem Glühen läuft das Stahlband 1 durch die Kühlzone 3, in der es mit Luft oder Luft und Wassersprühnebel auf Temperaturen unter 100 °C abgekühlt wird. Danach läuft das Stahlband 1 in der Transportrichtung R um die Umlenkrolle 15 und über den S-Rollenstand 16 durch die Streckbiegerichtvorrichtung 4 zur Erzeugung eines planen Bandes. Von dort läuft es durch die Stahlkorn-Strahlvorrichtung 5. Mit dieser kann warmgewalztes nichtrostendes Stahlband 1 vorentzundert werden. Die Stahlkom-Strahlvorrichtung 5 ist bei entsprechend leistungsstärkerer Auslegung der nachfolgendem Plasmaentzunderungsanlage 6 nicht erforderlich.The steel strip 1 is unwound from a discharge reel 11. With the welding machine 12, the band ends of the following bundles are welded together. Thereafter, the tape passes through a tape storage 13, from there via an S-roll stand 14 for generating the strip tension, of this by the horizontal annealing furnace 2, in which it is briefly annealed at temperatures up to 1200'C. After annealing, the steel strip 1 passes through the cooling zone 3, where it is cooled with air or air and water spray to temperatures below 100 ° C. Thereafter, the steel strip 1 runs in the transport direction R about the guide roller 15 and over the S-roller stand 16 by the stretch bending device 4 for producing a flat strip. From there it passes through the steel grain blasting device 5. This can be used to pre-descaling hot rolled stainless steel strip 1. The Stahlkom-blasting device 5 is not required with correspondingly more powerful design of the following plasma descaling system 6.

Das Stahlhand 1 läuft dann über einen weiteren S-Rollenstand 17, der zur Erzeugung des Bandzuges erforderlich ist, durch eine mehrstufige Vakuumschleuse 7 in die Prozesskammer 8 der Plasmaentzunderungsanlage 6 ein, in der die Plasmaentzunderung stattfindet. Oberhalb und unterhalb des Bandes 1 sind über die gesamte Bandbreite in einem vorgegebenen Abstand zum Band Elektroden 9 zur Erzeugung des Plasmas angeordnet. Die hier schematisch gezeigte Plasmaentzunderungsanlage 6 hat 2 Prozesskammern 8. Je nach Leistung der Anlage kann die Anzahl und Länge der Prozesskammern 8 unterschiedlich sein. Zwischen den Prozesskammern ist eine Kühlzone mit anstellbaren Kühlrollen 10 zur Bandkühlung angeordnet, die sich ebenfalls im Vakuum befinden. Das Stahlband wird mit den Kühlrollen 10 vorzugsweise auf eine Temperatur unter 100 °C gekühlt und läuft danach durch die zweite Prozesskammer 8, in der ebenfalls oberhalb und unterhalb des Stahlbandes 1 Elektroden zur Erzeugung des Plasmas angeordnet sind. In dieser Prozesskammer erfolgt die vollständige Entfernung des noch vorhandenen Zunders auf beiden Seiten des Stahlbandes. Danach läuft das entzunderte Stahlband durch die zweite Kühlzone mit 3 Kühlrollen 10, in der es auf eine Temperatur unter 100 °C abgekühlt wird. Von dort läuft es durch die mehrstufige Vakuumschleuse 7 und tritt danach in die Luftatmosphäre ein.The steel hand 1 then passes through a further S-roll stand 17, which is required to produce the strip tension, through a multi-stage vacuum lock 7 into the process chamber 8 of the plasma descaling unit 6, in which the plasma descaling takes place. Above and below the band 1, electrodes 9 for generating the plasma are arranged over the entire bandwidth at a predetermined distance from the band. The plasma descaling system 6 shown schematically here has 2 Process chambers 8. Depending on the performance of the system, the number and length of the process chambers 8 may be different. Between the process chambers, a cooling zone is arranged with adjustable cooling rollers 10 for belt cooling, which are also in a vacuum. The steel strip is preferably cooled with the cooling rollers 10 to a temperature below 100 ° C and then passes through the second process chamber 8, in which also above and below the steel strip 1 electrodes for generating the plasma are arranged. In this process chamber, the complete removal of the remaining scale on both sides of the steel strip takes place. Thereafter, the descaled steel strip passes through the second cooling zone with 3 cooling rollers 10, in which it is cooled to a temperature below 100 ° C. From there it runs through the multi-stage vacuum lock 7 and then enters the air atmosphere.

Über einen S-Rollenstand 18 und über einen Bandspeicher 19 läuft das Stahlband 1 zum Aufwickelhaspel 20, wo es zu dem fertigen Bund 21 aufgewickelt wird. Insgesamt ergibt sich mit dem beschriebenen Verfahren und der Anlage zum Glühen und Entzundern von Band aus nichtrostendem Stahl eine wirtschaftliche und ökologisch sehr vorteilhafte Technologie zur Herstellung von qualitativ hochwertigen nichtrostendem Stahlband, das die Anforderungen des Marktes erfüllt.Via an S-pulley stand 18 and via a belt store 19, the steel belt 1 runs to the take-up reel 20, where it is wound up into the finished collar 21. Overall, the described method and apparatus for annealing and descaling stainless steel strip provides an economically and environmentally very advantageous technology for producing high quality stainless steel strip which meets the requirements of the market.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

RR
Transportrichtungtransport direction
11
Stahlbandsteel strip
22
DurchlaufofenContinuous furnace
33
Kühlzonecooling zone
44
StreckrichtvorrichtungTension leveling device
55
Stahlkorn-StrahlvorrichtungSteel grain blowing means
66
Plasmaentzunderungsanlageplasma descaling
77
Vakuumschleusevacuum lock
88th
Prozesskammerprocess chamber
99
Plasmaelektrodenplasma electrodes
1010
Kühlrollencooling rolls
1111
Abhaspeluncoiler
1212
Schweißmaschinewelding machine
1313
EinlaufbandspeicherEntry looper
1414
BandzugstationBandzugstation
1515
Umlenkrolleidler pulley
1616
BandzugstationBandzugstation
1717
BandzugstationBandzugstation
1818
BandzugstationBandzugstation
1919
AuslaufbandspeicherDiscontinued tape storage
2020
Aufwickelhaspelrecoiler
2121
fertiges Stahlbundfinished steel collar

Claims (7)

  1. Method of annealing and descaling hot-rolled strip of austenitic stainless steel, characterised in that
    - the steel strip (1) is briefly annealed in a continuous line initially at a temperature of at most 1200° C in a continuous furnace (2),
    - thereafter cooled in a succeeding cooling path (3) to a temperature below 100° C,
    - thereafter straightened in a stretch-bend straightening device (4) and
    - subsequently descaled in a coupled plasma descaling installation (6), wherein the plasma descaling is carried out under vacuum in several stages and the steel strip between these stages and after the last stage is subjected to a regulated cooling by means of cooling rollers (10) so that the steel strip on exit from the plasma descaling installation has a temperature of below 100° C.
  2. Method of annealing and descaling hot-rolled strip of ferritic stainless steel, characterised in that
    - the steel strip initially as a coil in a hood annealing device is subjected to long-duration annealing with succeeding cooling of the coil to a temperature below 100° C and
    - the strip is subsequently descaled in a coupled plasma descaling installation (6),
    wherein the plasma descaling is carried out under vacuum in several stages and the steel strip between these stages and after the last stage is subjected to a regulated cooling by means of cooling rollers (10) so that the steel strip on exit from the plasma descaling installation has a temperature of below 100° C.
  3. Method according to claim 1 or 2, characterised in that prior to the plasma descaling a mechanical preliminary descaling is carried out by blasting with steel shot in a blasting device (5).
  4. Method according to any one of the preceding claims, characterised in that the production output of the plasma descaling installation is adaptable to the required strip speed in the annealing furnace and the requirements of different scale layers of different materials in that the overall length of the active plasma descaling path is so controlled by switching on and switching off plasma electrodes (9) that a highest possible production with faultless descaling of the two strip sides results.
  5. Method according to any one of claims 1 to 4, characterised in that after the plasma descaling a stretch-straightening and/or dressing of the descaled steel strip is carried out continuously in line.
  6. Method according to any one of claims 1 to 4, characterised in that the movement of the cathode focal spot over the two strip surfaces is controlled by means of moved electromagnetic fields during the plasma descaling.
  7. Device for carrying out the method according to any one of claims 1 to 6, characterised in that a preferably horizontal continuous furnace (2) with downstream cooling path (3), a device for stretch-bend straightening (4), a device for mechanical preliminary descaling (5) by blasting with steel shot and a plasma descaling installation (6) with devices for strip cooling (10) are arranged in the conveying direction (R) of the steel strip (1).
EP09837223.8A 2009-01-22 2009-12-22 Method and device for annealing and descaling strips of stainless steel Not-in-force EP2389260B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102009005797 2009-01-22
DE102009017701A DE102009017701A1 (en) 2009-01-22 2009-04-15 Method and apparatus for annealing and descaling stainless steel strip
PCT/DE2009/001832 WO2010083797A2 (en) 2009-01-22 2009-12-22 Method and device for annealing and descaling strips of stainless steel

Publications (2)

Publication Number Publication Date
EP2389260A2 EP2389260A2 (en) 2011-11-30
EP2389260B1 true EP2389260B1 (en) 2016-11-16

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EP09837223.8A Not-in-force EP2389260B1 (en) 2009-01-22 2009-12-22 Method and device for annealing and descaling strips of stainless steel

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US (1) US20110315280A1 (en)
EP (1) EP2389260B1 (en)
JP (1) JP2012515843A (en)
KR (1) KR20110103459A (en)
CN (1) CN102292172A (en)
AU (1) AU2009337991A1 (en)
BR (1) BRPI0924152A2 (en)
CA (1) CA2749962A1 (en)
DE (1) DE102009017701A1 (en)
MX (1) MX2011007710A (en)
RS (1) RS20110328A1 (en)
RU (1) RU2011134838A (en)
TW (1) TW201037084A (en)
WO (1) WO2010083797A2 (en)
ZA (1) ZA201105222B (en)

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CN104520473B (en) * 2012-07-31 2017-08-29 Posco公司 High speed acid washing method for manufacturing austenitic stainless steel cold-rolled steel sheet
CN103320589B (en) * 2013-06-11 2014-11-05 鞍钢股份有限公司 Method for preventing high-nickel steel billet from being oxidized in heating process
CN113846291A (en) * 2020-06-28 2021-12-28 宝山钢铁股份有限公司 Cleaning, coating and plating combined unit for galvanized steel sheet/coil and production method thereof
CN116287662A (en) * 2023-03-03 2023-06-23 中冶南方工程技术有限公司 A stainless steel bright annealing system and method
CN120094977B (en) * 2025-04-10 2025-10-03 宁波中顶新材料科技有限公司 Automatic production line and production method for stainless steel strip

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JPH06212382A (en) * 1993-01-14 1994-08-02 Nippon Steel Corp Method for hot metal plating of high-strength steel sheet
JPH07132316A (en) * 1993-11-10 1995-05-23 Kawasaki Steel Corp Continuous descaling method for metal strips
JPH07144212A (en) * 1993-11-25 1995-06-06 Nippon Steel Corp Metal surface treatment equipment row
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RU2145912C1 (en) 1998-09-08 2000-02-27 Сенокосов Евгений Степанович Method for working surface of metallic strip and apparatus for performing the same
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CN100415448C (en) * 2006-07-14 2008-09-03 山西太钢不锈钢股份有限公司 Method for removing iron scale on stainless steel surface

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BRPI0924152A2 (en) 2016-02-10
CA2749962A1 (en) 2010-07-29
WO2010083797A3 (en) 2010-12-09
RS20110328A1 (en) 2012-08-31
MX2011007710A (en) 2011-09-27
WO2010083797A2 (en) 2010-07-29
RU2011134838A (en) 2013-02-27
US20110315280A1 (en) 2011-12-29
TW201037084A (en) 2010-10-16
CN102292172A (en) 2011-12-21
AU2009337991A1 (en) 2011-08-18
ZA201105222B (en) 2012-03-28
EP2389260A2 (en) 2011-11-30
KR20110103459A (en) 2011-09-20
DE102009017701A1 (en) 2010-07-29
JP2012515843A (en) 2012-07-12

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