EP0789095A1 - Process and system for the treatment of stainless-steel strips - Google Patents
Process and system for the treatment of stainless-steel strips Download PDFInfo
- Publication number
- EP0789095A1 EP0789095A1 EP97250011A EP97250011A EP0789095A1 EP 0789095 A1 EP0789095 A1 EP 0789095A1 EP 97250011 A EP97250011 A EP 97250011A EP 97250011 A EP97250011 A EP 97250011A EP 0789095 A1 EP0789095 A1 EP 0789095A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- descaling
- stainless steel
- steel strips
- electrolytic
- belt
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 21
- 229910001220 stainless steel Inorganic materials 0.000 title claims description 13
- 239000010935 stainless steel Substances 0.000 title claims description 13
- 238000005554 pickling Methods 0.000 claims abstract description 7
- 238000004506 ultrasonic cleaning Methods 0.000 claims abstract description 5
- 230000009977 dual effect Effects 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000002604 ultrasonography Methods 0.000 claims description 20
- 230000010287 polarization Effects 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 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
- 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
- 238000005270 abrasive blasting Methods 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
- 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 method and a system for descaling the surface of stainless steel strips in an electrolytic strip treatment system with a plurality of electrodes arranged immediately one behind the other, alternately anodically connected in the case of cathodic band polarization and cathodically connected in the case of corresponding anodic band polarization.
- the known methods have disadvantages.
- the abrasive removal of the scale with blasting devices undesirably increases the roughness of the material surface from 1 to 1.5 ⁇ m RA to 4 to 6 ⁇ m RA.
- the dual descaling process uses e.g. B. sodium sulfate, ammonium sulfate, sulfuric acid or similar media as electrolytes and combines the electrolytic process with an ultrasonic cleaning.
- the effect of the electrolytic pickling part on the descaling is based on an increase in the volume of the scaling due to oxidation and a blasting effect due to the gas bubbles that are formed.
- these processes fail to produce a perfect, metallically pure material surface, since a large part of the scale remains on the base material of the strip due to adhesive energy.
- the cleaning effect of an electrolytic pickle is most effective with 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 strip surface leads to a higher adhesion of the scale.
- a system for descaling the surface of stainless steel strips in an electrolytic strip treatment system is characterized in accordance with the invention in that ultrasound generating devices are arranged at least between individual adjacent anode and / or cathode banks.
- ultrasound generating devices are arranged at least between individual adjacent anode and / or cathode banks.
- cell receiving the ultrasound generating device follow in a modular arrangement of an electrolytic cell receiving the electrodes.
- Other combinations are possible.
- the dissolved scale is removed from the surface of the strip to be cleaned, so that a completely descaled strip leaves the system.
- the treatment can be used in a more targeted manner and the process can thereby be optimized with regard to the performance and the required treatment duration.
- a further optimization of the proposed method is achieved by arranging the ultrasound generating device above and below the belt. It has been found to be advantageous if the ultrasound generating device directs the ultrasound waves against the tape running direction at an angle adapted to the tape throughput speed. In this way, the detaching effect of the adhering scale particles from the strip surface is increased. A good effect can also be achieved if, according to a further feature of the invention, the ultrasonic waves can be introduced axially to the band.
- 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 A plant for carrying out the method according to the invention is shown roughly schematically in FIG.
- the treatment container of the belt treatment system is designated by 5, through which the belt 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 strip are generally designated 1, they are alternately connected cathodically or anodically in the direction of strip travel (arrow).
- ultrasound generating devices 2 are arranged above and below the band, which are symbolized by triangles. These ultrasound generating devices serve to support the detachment process. of the surface scale.
- the effect of the ultrasound on the belt surface is due to the cavitation generated in the liquid, which practically mechanically removes the scale from the surface of the belt.
- FIG. 2 shows two containers 5 and 6 arranged one behind the other.
- the band 4 first passes in the direction of the arrow through the container 6 with the working electrodes 1, which are alternately connected cathodically or anodically here. Subsequently, the band 4 passes through the container 5, in which several ultrasound generating devices 2 are arranged in groups, which generate ultrasound waves above and below the band and loosen the scale through the cavitation. In this version, both descaling mechanisms can be used without mutual interference being controlled. While in the first container 6 the scale layer is loosened by gas bubbles and oxidized in the anodic area, this "loose" scale can be detected in the second container 5 that follows with the aid of ultrasound.
Landscapes
- 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 Verfahren und ein System zum Entzundern der Oberfläche von Edelstahlbändern in einer elektrolytischen Bandbehandlungsanlage mit mehreren unmittelbar hintereinander angeordneten, abwechselnd bei kathodischer Bandpolarisation anodisch geschalteten und bei entsprechender anodischer Bandpolarisation kathodisch geschalteten Elektroden.The invention relates to a method and a system for descaling the surface of stainless steel strips in an electrolytic strip treatment system with a plurality of electrodes arranged immediately one behind the other, alternately anodically connected in the case of cathodic band polarization and cathodically connected in the case of corresponding anodic band polarization.
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
- 1. Zunder, der bei der Erzeugung von Warmband entsteht,
- 2. Zunder, der beim Glühen von Warmband entsteht und
- 3. Zunder der beim Glühen von Kaltband entsteht.
- 1. Tinder that is produced when hot strip is produced
- 2. Tinder that is formed when hot strip is annealed and
- 3. Tinder that occurs when cold strip is annealed.
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 described in the literature and known to the experts. The differences in the scale structure have led to descaling concepts, which had to make great compromises in terms of material quality, especially in the area of hot strip scale produced during the production of hot strip and the hot scale formed during the hot strip annealing on the hot strip. In addition, the concepts can only be realized with high 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.In the past, scale layers of the type described have usually been removed using abrasive blasting devices or 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. The abrasive removal of the scale with blasting devices undesirably increases 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 high level of dust pollution in the environment during radiation treatment, 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 Verfahren und 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 prior art, it is the object of the present invention to provide a method and a system for descaling the surface of stainless steel strips that, with good environmental compatibility, enables the surface of stainless steel strips to be completely cleaned of any type of scale.
Zur Lösung der Aufgabe wird vorgeschlagen, ein bekanntes elektrolytisches Beizverfahren mit einer bekannten Ultraschallreinigung der Bandoberfläche in einem dualen Entzunderungsprozeß zu kombinieren.To achieve the object, it is proposed to combine a known electrolytic pickling process with a known ultrasonic cleaning of the strip surface in a dual descaling process.
Der duale Entzunderungsprozeß verwendet z. B. Natriumsulfat, Amoniumsulfat, Schwefelsäure oder ähnliche Medien als Elektrolyten und verbindet den elektrolytischen Prozeß mit einer Ultraschallreinigung. 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.The dual descaling process uses e.g. B. sodium sulfate, ammonium sulfate, sulfuric acid or similar media as electrolytes and combines the electrolytic process with an ultrasonic cleaning. The effect of the electrolytic pickling part on the descaling is based on an increase in the volume of the scaling due to oxidation and a blasting effect due to the gas bubbles that are formed. However, these processes fail to produce a perfect, metallically pure material surface, since a large part of the scale remains on the base material of the strip due to adhesive energy. With an annealed cold strip, the cleaning effect of an electrolytic pickle is most effective with 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 strip surface leads to a higher adhesion of the scale.
Zur Entfernung des anhaftenden Zunders nach der elektrolytischen Beize wurden zwar vorgeschlagen mechanische Hilfsmittel wie rotierende Bürsten einzusetzen, dies jedoch nicht mit dem gewünschten Erfolg, da die Bürsten nicht in der Lage sind, eine porentiefe Reinigung zu gewährleisten. Außerdem ist der Reinigugseffekt um so geringer, je höher die Oberflächenrauhigkeit der Bandoberfläche ist. Kombiniert man aber nach dem Gedanken der Erfindung das elektrolytische Beizen mit einer Ultraschallreinigung, so läßt sich eine totale Reinigung jeder Art von Band von jeder Art Zunder erzielen.To remove the adhering scale after the electrolytic pickling, mechanical aids such as rotating brushes have been proposed, but not with the desired success, since the brushes are not able to to ensure pore-deep cleaning. In addition, the higher the surface roughness of the belt surface, the lower the cleaning effect. However, if electrolytic pickling is combined with ultrasonic cleaning in accordance with the concept of the invention, total cleaning of any type of strip from any type of scale can be achieved.
Ein System zu Entzunderung der Oberfläche von Edelstahlbändern in einer elektrolytischen Bandbehandlungsanlage ist erfindungsgemäß dadurch gekennzeichnet, daß mindestens zwischen einzelnen benachbarten Anoden- und/oder Kathodenbänken Ultraschallerzeugungseinrichtungen angeordnet sind. 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.A system for descaling the surface of stainless steel strips in an electrolytic strip treatment system is characterized in accordance with the invention in that ultrasound generating devices are arranged at least between individual adjacent anode and / or cathode banks. However, there is also the possibility, in another version of the invention, of having a cell receiving the ultrasound generating device follow in a modular arrangement of an electrolytic cell receiving the electrodes. Other 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 disposing the ultrasound generating devices between or behind the electrodes, the dissolved scale is removed from the surface of the strip to be cleaned, so that a completely descaled strip leaves the system.
Um die Wrksamkeit 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.In order to change the effectiveness of the electrolytic treatment and the ultrasound treatment, it is provided according to a further feature of the invention to change the power of the electrodes and / or the ultrasound generating device as a function of the belt throughput speed. With this measure, the treatment can be used in a more targeted manner and the process can thereby be optimized with regard to the performance and the required treatment duration.
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 Wnkel 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.A further optimization of the proposed method is achieved by arranging the ultrasound generating device above and below the belt. It has been found to be advantageous if the ultrasound generating device directs the ultrasound waves against the tape running direction at an angle adapted to the tape throughput speed. In this way, the detaching effect of the adhering scale particles from the strip surface is increased. A good effect can also be achieved if, according to a further feature of the invention, the ultrasonic waves can be introduced axially to the band.
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 HCl 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.A plant for carrying out the method according to the invention is shown roughly schematically in FIG. The treatment container of the belt treatment system is designated by 5, through which 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 (7)
gekennzeichnet durch die Kombination eines bekannten elektrolytischen Beizverfahrens mit einer Ultraschallreinigung der Bandoberfläche in einem dualen Entzunderungsprozeß.Process for descaling the surface of stainless steel strips in plants for the production of pickled hot and cold strips,
characterized by the combination of a known electrolytic pickling process with an ultrasonic cleaning of the strip surface in a dual descaling process.
dadurch gekennzeichnet,
daß mindestens zwischen einzelnen benachbarten Anoden-(+) und/oder Kathodenbänken (-) Ultraschallerzeugungseinrichtungen (2) angeordnet sind.System for descaling the surface of stainless steel strips in an electrolytic strip treatment plant with several electrodes arranged one behind the other alternately anodically with cathodic band polarization and cathodically connected with corresponding anodic band polarization,
characterized,
that at least between individual adjacent anode (+) and / or cathode banks (-) ultrasound generating devices (2) are arranged.
dadurch gekennzeichnet,
daß in einer Modularanordnung einer die Elektroden (1) aufnehmenden elektrolytischen Zelle (6) eine die Ultraschallerzeugungseinrichtung (2) aufnehmende Zelle (5) folgt.System for descaling the surface of stainless steel strips in an electrolytic strip treatment plant with several electrodes arranged one behind the other alternately anodically with cathodic band polarization and cathodically connected with corresponding anodic band polarization,
characterized,
that in a modular arrangement an electrolytic cell (6) receiving the electrodes (1) is followed by a cell (5) receiving the ultrasound generating device (2).
dadurch gekennzeichnet,
daß die Leistung der Elektroden (1) und/oder der Ultraschallerzeugungseinrichtung (2) in Abhängigkeit von der Banddurchlaufgeschwindigkeit veränderbar ist.System for descaling the surface of stainless steel strips in an electrolytic strip treatment plant according to claims 2 and 3,
characterized,
that the power of the electrodes (1) and / or the ultrasound generating device (2) can be changed as a function of the belt throughput speed.
dadurch gekennzeichnet,
daß die Ultraschallerzeugungseinrichtungen (2) oberhalb und unterhalb des Bandes (4) angeordnet sind.System for descaling the surface of stainless steel strips in an electrolytic strip treatment plant according to claims 2 to 4,
characterized,
that the ultrasound generating devices (2) are arranged above and below the belt (4).
dadurch gekennzeichnet,
daß die Ultraschallerzeugungseinrichtungen (2) die Ultraschallwellen in einem der Banddurchlaufgeschwindigkeit angepaßten Winkel gegen die Laufrichtung des Band (4) richteten.System for descaling the surface of stainless steel strips in an electrolytic strip treatment system according to claims 2 to 5,
characterized,
that the ultrasound generating devices (2) directed the ultrasound waves at an angle adapted to the belt travel speed against the running direction of the belt (4).
dadurch gekennzeichnet,
daß die Ultraschallwellen axial zum Band (4) einleitbar sind.System for descaling the surface of stainless steel strips in an electrolytic strip treatment system according to claims 2 to 5,
characterized,
that the ultrasonic waves can be introduced axially to the belt (4).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19604971 | 1996-02-02 | ||
| DE19604971A DE19604971A1 (en) | 1996-02-02 | 1996-02-02 | Method and system for treating stainless steel strips |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0789095A1 true EP0789095A1 (en) | 1997-08-13 |
| EP0789095B1 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) |
Cited By (3)
| 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 |
| WO2020095198A1 (en) * | 2018-11-06 | 2020-05-14 | Arcelormittal | Us degreasing management |
| RU2764255C1 (en) * | 2018-11-06 | 2022-01-14 | Арселормиттал | Ultrasonic strip degreasing |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6562228B2 (en) | 2000-03-08 | 2003-05-13 | Nippon Steel Corporation | Ultrasonic pickling method and pickling device |
| EP1545329B1 (en) * | 2002-10-04 | 2012-07-11 | Tyco Healthcare Group 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 |
| 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 |
Citations (5)
| 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 | ||
| EP0518850A1 (en) * | 1991-06-10 | 1992-12-16 | Andritz-Patentverwaltungs-Gesellschaft m.b.H. | Process and device for electrolytic pickling of continuously moving electrically conducting articles |
| WO1995003439A1 (en) * | 1993-07-21 | 1995-02-02 | Dynamotive Corporation | A method for removal of certain oxide films from metal surfaces |
| US5409594A (en) * | 1993-11-23 | 1995-04-25 | Dynamotive Corporation | Ultrasonic agitator |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4046592A (en) * | 1976-01-12 | 1977-09-06 | Westinghouse Electric Corporation | Wire cleaning system |
| US5407544A (en) * | 1993-07-21 | 1995-04-18 | Dynamotive Corporation | Method for removal of certain oxide films from metal surfaces |
| TW296988B (en) * | 1993-09-17 | 1997-02-01 | Hitachi Ltd | |
| 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 DE DE59700638T patent/DE59700638D1/en not_active Expired - Fee Related
- 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 AT AT97250011T patent/ATE186338T1/en not_active IP Right Cessation
- 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
Patent Citations (5)
| 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 | ||
| EP0518850A1 (en) * | 1991-06-10 | 1992-12-16 | Andritz-Patentverwaltungs-Gesellschaft m.b.H. | Process and device for electrolytic pickling of continuously moving electrically conducting articles |
| WO1995003439A1 (en) * | 1993-07-21 | 1995-02-02 | Dynamotive Corporation | A method for removal of certain oxide films from metal surfaces |
| US5409594A (en) * | 1993-11-23 | 1995-04-25 | Dynamotive Corporation | Ultrasonic agitator |
Non-Patent Citations (1)
| Title |
|---|
| DATABASE WPI Section Ch Week 7644, Derwent World Patents Index; Class M11, AN 76-81747X, XP002029248 * |
Cited By (5)
| 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 |
| WO2020095198A1 (en) * | 2018-11-06 | 2020-05-14 | Arcelormittal | Us degreasing management |
| WO2020095090A1 (en) * | 2018-11-06 | 2020-05-14 | Arcelormittal | Cleaning method by ultrasound |
| RU2759938C1 (en) * | 2018-11-06 | 2021-11-18 | Арселормиттал | Management of ultrasonic degreasing |
| RU2764255C1 (en) * | 2018-11-06 | 2022-01-14 | Арселормиттал | Ultrasonic strip degreasing |
Also Published As
| Publication number | Publication date |
|---|---|
| US5897764A (en) | 1999-04-27 |
| ATE186338T1 (en) | 1999-11-15 |
| JPH101800A (en) | 1998-01-06 |
| DE59700638D1 (en) | 1999-12-09 |
| EP0789095B1 (en) | 1999-11-03 |
| DE19604971A1 (en) | 1997-08-07 |
| ES2137756T3 (en) | 1999-12-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100934303B1 (en) | Descaling, pickling and finishing / passivating methods and plants of stainless steel strips, and strips produced thereby | |
| EP1632589B1 (en) | Method for removing surface areas of a component | |
| EP0789095B1 (en) | System for the treatment of stainless steel strips | |
| EP0770707A1 (en) | Process for producing cold-rolled strip continuously | |
| AT399167B (en) | METHOD AND DEVICE FOR ELECTROLYTICALLY STICKING CONTINUOUSLY CONTINUOUS ELECTRICALLY CONDUCTIVE GOODS | |
| EP0927076B1 (en) | Method for renewed activation of honeycomb-shaped catalyst elements for denitrating flue gases | |
| DE2555175B2 (en) | Method and device for purifying waste water | |
| WO1995002706A1 (en) | Method and plant for the manufacture of special steel blanks | |
| EP0706840A2 (en) | Method and device for manufacturing cold rolled stainless steel from hot rolled strip | |
| DE4425854C1 (en) | Electrolytic surface treatment process and plant for carrying out the process | |
| AT413707B (en) | METHOD AND DEVICE FOR METALING | |
| DE60207225T2 (en) | HYDROGEN PEROXIDE SURFACES OF SILICONE-CONTAINING ELECTRIC RADIANT QUALITIES | |
| DE4110595C1 (en) | Wet-chemical removal of hard coatings from workpiece surfaces - comprises using hydrogen peroxide soln. stabilised by complex former e.g. potassium-sodium tartrate-tetra:hydrate | |
| DE4200849A1 (en) | Conditioning of rinse water from chemical and/or electrolytic surface treatment - includes passing rinse water from 1st tank of multistage rinse to electrodialysis unit and concentrate to treatment bath via selective ion exchanger and/or evaporator | |
| EP0359736A1 (en) | Method of electrolytically pickling special steel | |
| EP0445516B1 (en) | Process and apparatus for the production of silver nitrate | |
| DE2931229A1 (en) | METHOD FOR DESCALING HOT-ROLLED STRIP STEEL | |
| DE19721135A1 (en) | Process for the surface treatment of treated material made of stainless steel | |
| AT402737B (en) | Method for discontinuous pickling of metallic plates, in particular made of stainless steel | |
| DE3825857A1 (en) | STAINLESS ACID FOR STAINLESS STEEL AND METHOD FOR RECONSTRUCTING USED STAINLESS ACID | |
| WO2000006797A1 (en) | Stripper for special steel | |
| EP0814180A1 (en) | Process for treating stainless steel surfaces | |
| DE2627999A1 (en) | Wire coil pickling plant with vibrator - mounted on coil carrier to promote rust removal | |
| AT320375B (en) | Process and device for the hydrochloric acid pickling of strips and regeneration of the pickling liquor | |
| DE3911190A1 (en) | METHOD FOR THE ELECTROLYTIC MACHINING OF ENDLESS STEEL STRINGS |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE DE ES FI FR IT SE |
|
| 17P | Request for examination filed |
Effective date: 19971113 |
|
| 17Q | First examination report despatched |
Effective date: 19980918 |
|
| GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
| GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE DE ES FI FR IT SE |
|
| REF | Corresponds to: |
Ref document number: 186338 Country of ref document: AT Date of ref document: 19991115 Kind code of ref document: T |
|
| REF | Corresponds to: |
Ref document number: 59700638 Country of ref document: DE Date of ref document: 19991209 |
|
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2137756 Country of ref document: ES Kind code of ref document: T3 |
|
| ITF | It: translation for a ep patent filed |
Owner name: GUZZI E RAVIZZA S.R.L. |
|
| ET | Fr: translation filed | ||
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20050111 Year of fee payment: 9 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060131 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20060131 Year of fee payment: 10 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20060929 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20070110 Year of fee payment: 11 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20070111 Year of fee payment: 11 Ref country code: AT Payment date: 20070111 Year of fee payment: 11 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FI Payment date: 20070112 Year of fee payment: 11 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20070130 Year of fee payment: 11 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20070223 Year of fee payment: 11 |
|
| BERE | Be: lapsed |
Owner name: *MANNESMANN A.G. Effective date: 20080131 |
|
| EUG | Se: european patent has lapsed | ||
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080124 Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080801 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080124 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080125 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080131 |
|
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20080125 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080125 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070124 |