EP0789095B1 - System for the treatment of stainless steel strips - Google Patents
System for the treatment of stainless steel strips Download PDFInfo
- Publication number
- EP0789095B1 EP0789095B1 EP97250011A EP97250011A EP0789095B1 EP 0789095 B1 EP0789095 B1 EP 0789095B1 EP 97250011 A EP97250011 A EP 97250011A EP 97250011 A EP97250011 A EP 97250011A EP 0789095 B1 EP0789095 B1 EP 0789095B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- descaling
- electrolytic
- steel strips
- treatment plant
- 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.)
- Expired - Lifetime
Links
- 229910001220 stainless steel Inorganic materials 0.000 title description 7
- 239000010935 stainless steel Substances 0.000 title description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- 238000002604 ultrasonography Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 abstract description 12
- 238000005554 pickling Methods 0.000 abstract description 5
- 230000009977 dual effect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000004506 ultrasonic cleaning Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 8
- 238000004140 cleaning Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000002253 acid Substances 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 235000021110 pickles Nutrition 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
- B08B3/123—Cleaning travelling work, e.g. webs, articles on a conveyor
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
- C25F1/06—Iron or steel
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
Definitions
- the invention relates to a system for descaling the surface of Stainless steel strips in an electrolytic strip treatment plant for production of pickled hot strip and cold strip, with several immediately one after the other arranged alternately anodically connected with cathodic band polarization and connected with a corresponding anodic band polarization Electrodes
- Tinder layers of the type described have usually been used in the past Blasting devices removed abrasively or with chemical pickling treatment processes. The combination of the two devices with one another has also been proposed.
- the dual descaling system uses e.g. B. sodium sulfate, ammonium sulfate, Sulfuric acid or similar media as electrolytes and connects the electrolytic process with a known ultrasonic cleaning.
- the effect of the electrolytic pickling part on descaling is based on one Volume enlargement of the scale through oxidation and a chipping effect the resulting gas bubbles.
- these processes do not make it to produce flawless metallic pure material surface, because a large part of the Tinder remains due to adhesive energy on the base material of the belt.
- annealed Cold strip is the most effective cleaning effect of an electrolytic pickle at 80 % to 100%, depending on the material quality. With hot strip, however, this effect drops to 20 % to 50%, because the higher roughness of the belt surface increases the adhesion of the Tinder causes.
- electrolytic pickling is combined with a Ultrasonic cleaning, such as, for example, US-A-5 409 594, WO-A-95/03439 or propose and use JP-A-50 075 530 for treating wire Ultrasound generating devices, such as, for example, in GB-A-998 575 are described, so can be invented with the invented system Solve task and total descaling of the surface of the stainless steel strips of any kind of tinder.
- a Ultrasonic cleaning such as, for example, US-A-5 409 594, WO-A-95/03439 or propose and use JP-A-50 075 530 for treating wire Ultrasound generating devices, such as, for example, in GB-A-998 575 are described, so can be invented with the invented system Solve task and total descaling of the surface of the stainless steel strips of any kind of tinder.
- the power is to be changed of the electrodes and / or the ultrasound generating device depending on the To change the belt throughput speed.
- the ultrasound generating device By arranging the ultrasound generating device above and below the Band, a further optimization of the proposed method is achieved. It has proven to be favorable if the ultrasound generating device Ultrasound waves at an angle adapted to the speed of the tape point against the tape running direction. In this way, the chipping effect of the adhering scale particles reinforced by the belt surface. A good effect leaves can also be achieved if, according to a further feature of the invention Ultrasonic waves can be introduced axially to the tape.
- An additional area of application of the technology according to the invention is the removal of scale from hot-rolled normal steel. So far, the tinder has been and will be treated with acids such as B. H 2 SO 4 or HCl removed. Despite the use of regeneration processes to recover the acids, these processes also result in environmental pollution, namely immissions in air and water.
- FIG 1 is roughly schematically a plant for performing the invention Procedure illustrated.
- 5 is the treatment tank of the belt treatment plant referred to, which the band 4 to be treated passes in the horizontal direction.
- the tape 4 is guided and supported by the rollers 3.
- the so-called working electrodes Above and below the band are generally designated 1, they are in Belt running direction (arrow) alternately connected cathodically or anodically.
- Ultrasound generating devices 2 are located between the working electrodes 1. and arranged below the band, which are symbolized by triangles. This Ultrasonic generation devices serve to support the detachment process of the surface scale.
- the effect of the ultrasound on the belt surface is on the cavitation generated in the liquid is attributed to the scale, which is practical mechanically removed from the surface of the belt.
- FIG. 2 shows two containers 5 and 6 arranged one behind the other.
- the Band 4 first passes through the container 6 with the working electrodes 1 in the direction of the arrow, which are alternately connected cathodically or anodically. Subsequently the belt 4 passes through the container 5, in which several are grouped together Ultrasonic generating devices 2 are arranged above and below the Generate the band's ultrasound waves and loosen the scale by cavitation. At In this version, both descaling mechanisms can be used without mutual interference being controlled. While in the first container 6 the scale layer loosened by gas bubbles and oxidized in the anodic area can in subsequent second container 5 of this "loose" scale recognized with the help of ultrasound become.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
Die Erfindung betrifft ein System zur Entzunderung der Oberfläche von Edelstahlbändern in einer elektrolytischen Bandbehandlungsanlage zur Herstellung von gebeiztem Warmband und Kaltband, mit mehreren unmittelbar hintereinander angeordneten abwechselnd bei kathodischer Bandpolarisation anodisch geschalteten und bei entsprechender anodischen Bandpolarisation kathodisch geschalteten ElektrodenThe invention relates to a system for descaling the surface of Stainless steel strips in an electrolytic strip treatment plant for production of pickled hot strip and cold strip, with several immediately one after the other arranged alternately anodically connected with cathodic band polarization and connected with a corresponding anodic band polarization Electrodes
Für herzustellendes gebeiztes Warmband sowie für die Herstellung von Kaltband in
Edelstahlqualität ist der entstandene Zunder von der Bandoberfläche zu entfernen,
wobei drei Arten von Zunder zu unterscheiden sind, nämlich
Der unterschiedliche Aufbau der Zunderschichten ist vielfach in der Literatur beschrieben und der Fachwelt bekannt. Die Unterschiede im Zunderaufbau haben zu Entzunderungskonzepten geführt, die vor allem im Bereich des bei der Erzeugung von Warmband entstehenden Warmbandzunders und dem beim Glühen von Warmband auf dem Warmband entstehenden Glühzunders große Kompromisse bezogen auf die Materialqualität eingehen mußten. Darüber hinaus sind die Konzepte nur mit hohen Investitionskosten und auch Umweltproblemen zu verwirklichen. The different structure of the scale layers is often in the literature described and known to the experts. The differences in the scale structure have too Descaling concepts, which are mainly in the area of the generation of Hot strip scale and hot strip formed during annealing glow scale arising on the hot strip makes great compromises with regard to the Material quality had to go down. In addition, the concepts are only high Realize investment costs and environmental problems.
Zunderschichten der beschriebenen Art wurden in der Vergangenheit gewöhnlich mit Strahleinrichtungen abrasiv oder mit chemischen Beizbehandlungsverfahren entfernt. Auch die Kombination beider Einrichtungen miteinander ist vorgeschlagen worden.Tinder layers of the type described have usually been used in the past Blasting devices removed abrasively or with chemical pickling treatment processes. The combination of the two devices with one another has also been proposed.
Die bekannten Verfahren haben Nachteile. So erhöht die abrasive Entfernung des Zunders mit Strahleinrichtungen ungewünscht die Rauhigkeit der Materialoberfläche von 1 bis 1,5 µm RA auf 4 bis 6 µm RA. Gleichzeitig tritt bei der Strahlbehandlung eine starke Staubbelastung der Umgebung auf, die zu erheblicher Belästigung führt.The known methods have disadvantages. So the abrasive removal of the Tinder with blasting devices undesired the roughness of the material surface from 1 to 1.5 µm RA to 4 to 6 µm RA. At the same time there is a radiation treatment heavy dust pollution in the environment, which leads to considerable annoyance.
Die Behandlung der Bandoberflächen mit chemischen Beizmitteln führt zu hoher Umweltbelastung durch die verwendeten Säuren (HF, HNO3, H2, SO4) mit der späteren Einleitung von Fluor, Nitrat und Sulfat in die Flüsse.The treatment of the strip surfaces with chemical mordants leads to high environmental pollution due to the acids used (HF, HNO 3 , H 2 , SO 4 ) with the later introduction of fluorine, nitrate and sulfate into the rivers.
Ausgehend von den beschriebenen Problemen und Nachteilen des Standes der Technik ist es die Aufgabe der vorliegenden Erfindung, ein System zur Entzunderung der Oberfläche von Edelstahlbändern zu schaffen, daß bei guter Umweltverträglichkeit eine vollständige Reinigung der Oberfläche von Edelstahlbändern von jeglicher Art Zunder ermöglicht.Based on the described problems and disadvantages of the state of the Technology is the object of the present invention, a system for descaling the surface of stainless steel strips to create that with good environmental compatibility a complete cleaning of the surface of stainless steel strips of any kind Tinder enables.
Zur Lösung der Aufgabe wird ein duales System zu Entzunderung der Oberfläche von Edelstahlbändern in einer elektrolytischen Bandbehandlungsanlage vorgeschlagen, das erfindungsgemäß dadurch gekennzeichnet ist, daß mindestens zwischen einzelnen benachbarten Anoden-(+) und/oder Kathodenbänken (-) Ultraschallerzeugungseinrichtungen angeordnet sind.To solve the problem, a dual system for descaling the surface of Stainless steel strips proposed in an electrolytic strip treatment plant, which is characterized according to the invention in that at least between individual adjacent anode (+) and / or cathode banks (-) Ultrasound generating devices are arranged.
Das duale Entzunderungssystem verwendet z. B. Natriumsulfat, Amoniumsulfat, Schwefelsäure oder ähnliche Medien als Elektrolyten und verbindet den elektrolytischen Prozeß mit einer bekannten Ultraschallreinigung.The dual descaling system uses e.g. B. sodium sulfate, ammonium sulfate, Sulfuric acid or similar media as electrolytes and connects the electrolytic process with a known ultrasonic cleaning.
Die Wirkung des elektrolytischen Beizteils auf die Entzunderung basiert auf einer Volumenvergrößerung des Zunders durch Oxidation und einen Absprengeffekt durch die entstehenden Gasblasen. Diese Vorgänge schaffen es jedoch nicht, eine einwandfreie metallisch reine Materialoberfläche zu erzeugen, da ein großer Teil des Zunders durch Haftenergie am Grundmaterial des Bandes verbleibt. Bei geglühtem Kaltband ist die Reinigungswirkung einer elektrolytischen Beize am effektivsten mit 80 % bis 100 %, je nach Materialqualität. Bei Warmband sinkt dieser Effekt jedoch auf 20 % bis 50 %, weil die höhere Rauhigkeit der Bandoberfläche eine höhere Haftung des Zunders bewirkt. Man hat zwar schon zur Entfernung des anhaftenden Zunders von Bändern nach der elektrolytischen Beize mechanische Hilfsmittel wie rotierende Bürsten eingesetzt, dies jedoch nicht mit dem gewünschten Erfolg, da die Bürsten nicht in der Lage sind, eine porentiefe Reinigung zu gewährleisten. Außerdem ist der Reinigungseffekt um so geringer, je höher die Oberflächenrauhigkeit der Bandoberfläche ist.The effect of the electrolytic pickling part on descaling is based on one Volume enlargement of the scale through oxidation and a chipping effect the resulting gas bubbles. However, these processes do not make it to produce flawless metallic pure material surface, because a large part of the Tinder remains due to adhesive energy on the base material of the belt. With annealed Cold strip is the most effective cleaning effect of an electrolytic pickle at 80 % to 100%, depending on the material quality. With hot strip, however, this effect drops to 20 % to 50%, because the higher roughness of the belt surface increases the adhesion of the Tinder causes. One has to remove the adhering scale from Belts after electrolytic pickling mechanical aids such as rotating ones Brushes are used, but not with the desired success because of the brushes are unable to guarantee deep cleaning. In addition, the The higher the surface roughness, the lower the cleaning effect Belt surface is.
Kombiniert man aber erfindungsgemäß das elektrolytische Beizen mit einer Ultraschallreinigung, wie es zum Beispiel die US-A-5 409 594, die WO-A-95/03439 oder die JP-A-50 075 530 zum Behandeln von Draht vorschlagen und verwendet man Ultraschallerzeugungseinrichtungen, wie sie beispielsweise in der GB-A-998 575 beschrieben sind, so läßt sich mit dem erfundenen System die erfindungsgemäße Aufgabe lösen und eine totale Entzunderung der Oberfläche der Edelstahlbändern von jeder Art Zunder erzielen.However, according to the invention, electrolytic pickling is combined with a Ultrasonic cleaning, such as, for example, US-A-5 409 594, WO-A-95/03439 or propose and use JP-A-50 075 530 for treating wire Ultrasound generating devices, such as, for example, in GB-A-998 575 are described, so can be invented with the invented system Solve task and total descaling of the surface of the stainless steel strips of any kind of tinder.
Es besteht aber auch die Möglichkeit, in einer anderen Version der Erfindung in einer Modularanordnung einer die Elektroden aufnehmenden elektrolytischen Zelle eine die Ultraschallerzeugungseinrichtung aufnehmende Zelle folge zu lassen. Weitere Kombinationen sind denkbar.But there is also the possibility in another version of the invention in one Modular arrangement of an electrolytic cell receiving the electrodes To let the ultrasound generating device receiving cell follow. Further Combinations are possible.
Durch die Anordnung der Ultraschallerzeugungseinrichtungen zwischen oder hinter den Elektroden wird der gelöste Zunder einwandfrei von der Oberfläche des zu reinigenden Bandes entfernt, so daß ein total entzundertes Band die Anlage verläßt.By arranging the ultrasound generating devices between or behind The dissolved scale is perfectly removed from the surface of the electrodes cleaning tape removed so that a totally descaled tape leaves the system.
Um die Wirksamkeit der elektrolytischen Behandlung und der Ultraschallbehandlung zu verändern ist nach einem weiteren Merkmal der Erfindung vorgesehen, die Leistung der Elektroden und/oder der Ultraschallerzeugungseinrichtung in Abhängigkeit von der Banddurchlaufgeschwindigkeit zu verändern. Durch diese Maßnahme läßt sich die Behandlung gezielter einsetzen und der Prozeß kann dadurch hinsichtlich der Leistungsfähigkeit und der erforderlichen Behandlungsdauer optimiert werden.To the effectiveness of electrolytic treatment and ultrasound treatment According to a further feature of the invention, the power is to be changed of the electrodes and / or the ultrasound generating device depending on the To change the belt throughput speed. This measure allows the Use treatment in a more targeted manner and the process can therefore be used with regard to Performance and the required treatment time can be optimized.
Durch Anordnung der Ultraschallerzeugungseinrichtung oberhalb und unterhalb des Bandes wird eine weitere Optimierung des vorgeschlagenen Verfahrens erreicht. Es hat sich als günstig herausgestellt, wenn die Ultraschallerzeugungseinrichtung die Ultraschallwellen in einem der Banddurchlaufgeschwindigkeit angepaßten Winkel gegen die Bandlaufrichtug richten. Auf diese Weise wird der Absprengeffekt der anhaftenden Zunderpartikel von der Bandoberfläche verstärkt. Eine gute Wirkung läßt sich auch dann erzielen, wenn nach einem weiteren Merkmal der Erfindung die Ultraschallwellen axial zum Band einleitbar sind. By arranging the ultrasound generating device above and below the Band, a further optimization of the proposed method is achieved. It has proven to be favorable if the ultrasound generating device Ultrasound waves at an angle adapted to the speed of the tape point against the tape running direction. In this way, the chipping effect of the adhering scale particles reinforced by the belt surface. A good effect leaves can also be achieved if, according to a further feature of the invention Ultrasonic waves can be introduced axially to the tape.
Ein zusätzliches Anwendungsgebiet der erfindungsgemäßen Technologie ist die Zunderentfernung von warmgewalztem Normalstahl. Hier wurde bisher und wird der Zunder mit Säuren wie z. B. H2SO4 oder HCI entfernt. Auch diese Verfahren haben trotz Einsatz von Regenerationsverfahren zur Rückgewinnung der Säuren Umweltbelastungen zur Folge, und zwar Immission in Luft und Wasser.An additional area of application of the technology according to the invention is the removal of scale from hot-rolled normal steel. So far, the tinder has been and will be treated with acids such as B. H 2 SO 4 or HCl removed. Despite the use of regeneration processes to recover the acids, these processes also result in environmental pollution, namely immissions in air and water.
Eine Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend beschrieben. Es zeigt:
Figur 1- einen grob schematischen Querschnitt durch eine elektrolytische Bandbehandlungsanlage mit dem erfindungsgemäßen System und
Figur 2- eine eben solche Anlage mit Modularanordnung von Elektroden und Ultraschallerzeugungseinrichtung.
- Figure 1
- a roughly schematic cross section through an electrolytic belt treatment plant with the system according to the invention and
- Figure 2
- such a system with a modular arrangement of electrodes and ultrasound generating device.
In Figur 1 ist grob schematisch eine Anlage zur Durchführung des erfindungsgemäßen
Verfahrens dargestellt. Mit 5 ist der Behandlungsbehälter der Bandbehandlungsanlage
bezeichnet, den das zu behandelnde Band 4 in horizontaler Richtung durchläuft. Dabei
wird das Band 4 von den Rollen 3 geführt und gestützt. Die sogenannten Arbeitselektroden
oberhalb und unterhalb des Bandes sind allgemein mit 1 bezeichnet, sie sind in
Bandlaufrichtung (Pfeil) alternierend kathodisch bzw. anodisch geschaltet. Neben bzw.
zwischen den Arbeitselektroden 1 sind Ultraschallerzeugungseinrichtungen 2 ober-
und unterhalb des Bandes angeordnet, die durch Dreiecke symbolisiert sind. Diese
Ultraschallerzeugungseinrichtungen dienen der Unterstützung des Ablöseprozesses
des Oberflächenzunders. Die Wirkung des Ultraschalls auf die Bandoberfläche ist auf
die erzeugte Kavitation in der Flüssigkeit zurückzuführen, welche den Zunder praktisch
mechanisch von der Oberfläche des Bandes entfernt.In Figure 1 is roughly schematically a plant for performing the invention
Procedure illustrated. With 5 is the treatment tank of the belt treatment plant
referred to, which the band 4 to be treated passes in the horizontal direction. Here
the tape 4 is guided and supported by the
In Figur 2 sind zwei hintereinander angeordnete Behälter 5 und 6 dargestellt. Das
Band 4 durchläuft in Pfeilrichtung zunächst den Behälter 6 mit den Arbeitselektroden 1,
die auch hier abwechselnd kathodisch bzw. anodisch geschaltet sind. Anschließend
durchläuft das Band 4 den Behälter 5, in dem in Gruppen zusammengefaßt mehrere
Ultraschallerzeugungseinrichtungen 2 angeordnet sind, die oberhalb und unterhalb des
Bandes Ultraschallwellen erzeugen und durch die Kavitation den Zunder lösen. Bei
dieser Ausführung können beide Entzunderungsmechanismen ohne gegenseitige Beeinflussung
gesteuert werden. Während in dem ersten Behälter 6 die Zunderschicht
durch Gasblasen aufgelockert und im anodischen Bereich aufoxidiert wird, kann im
darauffolgenden zweiten Behälter 5 dieser "lose" Zunder mit Hilfe des Ultraschalls erkannt
werden.FIG. 2 shows two
Claims (6)
- A system for descaling the surface of high-grade steel strips in an electrolytic strip treatment plant for producing pickled hot strip and cold strip, having a plurality of electrodes arranged directly one behind the other which are alternately anodically connected for cathodic strip polarisation and cathodically connected for corresponding anodic strip polarisation, characterised in that ultrasound generating means (2) are arranged at least between individual adjacent anode banks (+) and/or cathode banks (-).
- A system for descaling the surface of high-grade steel strips in an electrolytic strip treatment plant having a plurality of electrodes arranged directly one behind the other which are alternately anodically connected for cathodic strip polarisation and cathodically connected for corresponding anodic strip polarisation, characterised in that in a modular arrangement an electrolytic cell (6) holding the electrodes (1) is followed by a cell (5) holding the ultrasound generating means (2).
- A system for descaling the surface of high-grade steel strips in an electrolytic strip treatment plant according to Claims 1 and 2, characterised in that the output of the electrodes (1) and/or of the ultrasound generating means (2) can be changed depending on the speed of passage of the strip.
- A system for descaling the surface of high-grade steel strips in an electrolytic strip treatment plant according to Claims 1 to 3, characterised in that the ultrasound generating means (2) are arranged above and below the strip (4).
- A system for descaling the surface of high-grade steel strips in an electrolytic strip treatment plant according to Claims 2 to 4, characterised in that the ultrasound generating means (2) direct the ultrasonic waves at an angle counter to the direction of travel of the strip (4) which is adapted to the speed of passage of the strip.
- A system for descaling the surface of high-grade steel strips in an electrolytic strip treatment plant according to Claims 2 to 4, characterised in that the ultrasonic waves can be introduced axially to the strip (4).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19604971A DE19604971A1 (en) | 1996-02-02 | 1996-02-02 | Method and system for treating stainless steel strips |
| DE19604971 | 1996-02-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0789095A1 EP0789095A1 (en) | 1997-08-13 |
| EP0789095B1 true EP0789095B1 (en) | 1999-11-03 |
Family
ID=7785103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97250011A Expired - Lifetime EP0789095B1 (en) | 1996-02-02 | 1997-01-24 | System for the treatment of stainless steel strips |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5897764A (en) |
| EP (1) | EP0789095B1 (en) |
| JP (1) | JPH101800A (en) |
| AT (1) | ATE186338T1 (en) |
| DE (2) | DE19604971A1 (en) |
| ES (1) | ES2137756T3 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1093450C (en) * | 1999-01-28 | 2002-10-30 | 北京工业大学 | Tungsten-pole argon arc-welding metal-powder-core weld wire for aged martensite steel and production method thereof |
| WO2001066829A1 (en) | 2000-03-08 | 2001-09-13 | Nippon Steel Corporation | Ultrasonic pickling method and pickling device |
| EP2394586B1 (en) * | 2002-10-04 | 2013-07-31 | Covidien LP | Sharpoint needle |
| WO2006007639A1 (en) * | 2004-07-16 | 2006-01-26 | Soniclean Pty Ltd | An improved apparatus and method for cleaning using a combination of electrolysis and ultrasonics |
| TWI487816B (en) | 2012-10-24 | 2015-06-11 | Zen Material Technologies Inc | Alkaline electrolysis derusting method |
| CN103898525A (en) * | 2012-12-28 | 2014-07-02 | 周宜锦 | Method for removing scale of rolled steel |
| WO2020095091A1 (en) * | 2018-11-06 | 2020-05-14 | Arcelormittal | Equipment improving the ultrasound cleaning |
| WO2020095090A1 (en) * | 2018-11-06 | 2020-05-14 | Arcelormittal | Cleaning method by ultrasound |
| DE102020106353A1 (en) | 2020-03-09 | 2021-09-09 | Thyssenkrupp Steel Europe Ag | Method for descaling a steel strip and plant for descaling a steel strip |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB998575A (en) * | 1962-01-17 | 1965-07-14 | Noburo Sasaki | Process for cleaning metal surfaces and apparatus therefor |
| JPS5075530A (en) * | 1973-11-09 | 1975-06-20 | ||
| US4046592A (en) * | 1976-01-12 | 1977-09-06 | Westinghouse Electric Corporation | Wire cleaning system |
| AT399167B (en) * | 1991-06-10 | 1995-03-27 | Andritz Patentverwaltung | METHOD AND DEVICE FOR ELECTROLYTICALLY STICKING CONTINUOUSLY CONTINUOUS ELECTRICALLY CONDUCTIVE GOODS |
| US5407544A (en) * | 1993-07-21 | 1995-04-18 | Dynamotive Corporation | Method for removal of certain oxide films from metal surfaces |
| IL110297A0 (en) * | 1993-07-21 | 1994-10-21 | Dynamotive Corp | A method for removal of certain oxide films from metal surfaces |
| TW296988B (en) * | 1993-09-17 | 1997-02-01 | Hitachi Ltd | |
| US5409594A (en) * | 1993-11-23 | 1995-04-25 | Dynamotive Corporation | Ultrasonic agitator |
| US5795460A (en) * | 1996-04-10 | 1998-08-18 | Dynamotive Corporation | Method for removal of films from metal surfaces using electrolysis and cavitation action |
| US5653860A (en) * | 1996-05-02 | 1997-08-05 | Mitsubishi Semiconductor America, Inc. | System for ultrasonic removal of air bubbles from the surface of an electroplated article |
-
1996
- 1996-02-02 DE DE19604971A patent/DE19604971A1/en not_active Withdrawn
-
1997
- 1997-01-24 AT AT97250011T patent/ATE186338T1/en not_active IP Right Cessation
- 1997-01-24 ES ES97250011T patent/ES2137756T3/en not_active Expired - Lifetime
- 1997-01-24 EP EP97250011A patent/EP0789095B1/en not_active Expired - Lifetime
- 1997-01-24 DE DE59700638T patent/DE59700638D1/en not_active Expired - Fee Related
- 1997-01-27 JP JP9027159A patent/JPH101800A/en active Pending
- 1997-01-30 US US08/791,819 patent/US5897764A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US5897764A (en) | 1999-04-27 |
| EP0789095A1 (en) | 1997-08-13 |
| DE19604971A1 (en) | 1997-08-07 |
| ES2137756T3 (en) | 1999-12-16 |
| DE59700638D1 (en) | 1999-12-09 |
| JPH101800A (en) | 1998-01-06 |
| ATE186338T1 (en) | 1999-11-15 |
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