EP0972854A2 - Process for pickling stainless steel - Google Patents

Process for pickling stainless steel Download PDF

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Publication number
EP0972854A2
EP0972854A2 EP99111754A EP99111754A EP0972854A2 EP 0972854 A2 EP0972854 A2 EP 0972854A2 EP 99111754 A EP99111754 A EP 99111754A EP 99111754 A EP99111754 A EP 99111754A EP 0972854 A2 EP0972854 A2 EP 0972854A2
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EP
European Patent Office
Prior art keywords
pickling
chlorine
hydrochloric acid
oxidizing agent
addition
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EP99111754A
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German (de)
French (fr)
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EP0972854A3 (en
EP0972854B1 (en
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Brigitta Wasserbauer
Edgar Braun
Gerald Dipl.-Ing.Dr. Maresch
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Andritz AG
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Andritz Patentverwaltungs GmbH
Andritz AG
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel

Definitions

  • the invention relates to a method for pickling stainless steel, wherein under Stainless steel qualities AlSl 200, 300 and 400 according to the US standards be understood.
  • This concentration must be at least according to the present invention a third, but preferably half, of those solved by the pickling attack Metals amount to a corresponding effect in relation to To achieve pickling time.
  • the invention is therefore characterized in that the stainless steel is treated in an aqueous solution of hydrochloric acid at temperatures of at least 40 ° C.
  • a favorable embodiment of the invention is characterized in that the stainless steel is treated in an aqueous solution of hydrochloric acid at temperatures up to a maximum of the boiling point of an azeotropic hydrochloric acid.
  • An advantageous development of the invention is characterized in that an oxidizing agent is added to the aqueous hydrochloric acid.
  • a favorable further development of the invention is characterized in that one or more substances from the following compounds nitric acid, chlorine, hydrogen peroxide, chlorine-oxygen compounds, other chlorine-containing acids such as perchloric acid, chromium oxygen compounds such as CrO 3 and ferric chloride are used as the oxidizing agent.
  • An advantageous embodiment of the invention is characterized in that the addition takes place in such a way that at least one third, preferably half, of the metals dissolved in the pickling attack is in the form of ferric chloride.
  • An advantageous development of the invention is characterized in that the content of ferrichloride in the pickling solution is determined by measuring the density, conductivity, redox potential or photometrically and a combination of these measurement methods, the content of ferrichloride being able to be set or regulated on the basis of the measured value .
  • the first belt was moved through the pickling tanks at 30 m / min (pickling time 120 sec.) And was almost unpickled after pickling. The same band was pulled through the pickling tanks again and was after only about 50% descaled. Only after another transport through the pickling tub, this time at a speed of 15 m / min the tape is scale-free. The total pickling time was therefore 480 sec.

Abstract

A special steel pickling process, employing a hot aqueous hydrochloric acid solution, is new. A special steel pickling process uses an aqueous hydrochloric acid solution at ≥ 40 degrees C. Preferred Features: The solution contains one or more oxidizing agents selected from nitric acid, chlorine, hydrogen peroxide, chlorine-oxygen compounds, other chlorine-containing acids (e.g. perchloric acid), chromium-oxygen compounds (e.g. CrO3) and ferric chloride, in amount such that at least half of the dissolved metal is in the form of ferric chloride.

Description

Die Erfindung betrifft ein Verfahren zum Beizen von Edelstahl, wobei unter Edelstahl die Qualitäten AlSl 200, 300 und 400 nach den US Normen verstanden werden.The invention relates to a method for pickling stainless steel, wherein under Stainless steel qualities AlSl 200, 300 and 400 according to the US standards be understood.

Das Beizen von Normalstahl mit Salzsäure hat sich in den letzten Jahren weltweit durchgesetzt und wird praktisch in allen Ländern und Stahlwerken benutzt. Beim Beizen von Edelstahl gab es bisher jedoch das technischen Vorurteil, daß dies wegen der unterschiedlichen Zunderausbildung nicht möglich ist. Es hat sich jedoch als überraschender Effekt gezeigt, daß sehr wohl auch mit Salzsäure ein Beizeffekt erzielbar ist. Die notwendigen Beizzeiten zum Erzielen einer zunderfreien Oberfläche sind jedoch im Verhältnis zum Normalstahl extrem lang. So wird ein Stahlband der Qualität St 12 in maximal 30 sec. bei 80 °C gebeizt, ein vergleichbares Band der Qualität AlSl 409 benötigt bei 90 °C bis zu 10 Minuten. Diese extrem langen Beizzeiten sind für den praktischen Betrieb unbrauchbar, da die notwendigen Beizanlagen zu lange werden würden.The pickling of normal steel with hydrochloric acid has changed in recent years enforced worldwide and is practically in all countries and steelworks used. Until now, this was the case with pickling stainless steel technical prejudice that this is because of the different scale formation not possible. However, it has a surprising effect shown that a pickling effect can very well be achieved with hydrochloric acid. The are necessary pickling times to achieve a scale-free surface however, extremely long compared to normal steel. This is how a steel belt is made quality St 12 stained at 80 ° C in a maximum of 30 seconds, a comparable one AlSl 409 quality tape takes up to 10 minutes at 90 ° C. This extremely long pickling times are unusable for practical operation, because the necessary pickling lines would be too long.

Als überraschender Effekt hat sich gezeigt, daß bei Zugabe eines Oxidationsmittels zur verwendeten Salzsäure beim Beizen diese Beizzeit auf 50 % der vorhergehenden Zeit verkürzt werden kann. Als Oxidationsmittel können dabei alle üblichen Oxidationsmittel wie z. B. Salpetersäure, Chlor, Wasserstoffperoxid, Chlor - Sauerstoffverbindungen, sauerstoffhaltige Gase, andere chlorhaltige Säuren wie Perchlorsäure, Chromsauerstoffverbindungen wie CrO3 und Ferrichlorid verwendet werden. Als Maß für die Zugabe wird dabei die Oxidation des in der Beizsäure vorhandenen und durch den Beizangriff gelösten Eisens zu Ferrichlorid verwendet. It has been shown as a surprising effect that when an oxidizing agent is added to the hydrochloric acid used during pickling, this pickling time can be shortened to 50% of the previous time. All the usual oxidizing agents such as, for. B. nitric acid, chlorine, hydrogen peroxide, chlorine-oxygen compounds, oxygen-containing gases, other chlorine-containing acids such as perchloric acid, chromium oxygen compounds such as CrO 3 and ferrichloride can be used. The oxidation of the iron present in the pickling acid and dissolved by the pickling attack to ferrichloride is used as a measure of the addition.

Diese Konzentration muß nach der vorliegenden Erfindung mindestens ein Drittel, vorzugsweise aber die Hälfte der durch den Beizangriff gelösten Metalle betragen um einen entsprechenden Effekt in Bezug auf Beizzeit zu erzielen.This concentration must be at least according to the present invention a third, but preferably half, of those solved by the pickling attack Metals amount to a corresponding effect in relation to To achieve pickling time.

Die Erfindung ist daher dadurch gekennzeichnet, daß der Edelstahl in einer wäßrigen Lösung von Salzsäure bei Temperaturen von mindestens 40 °C behandelt wird.
Eine günstige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß der Edelstahl in einer wäßrigen Lösung von Salzsäure bei Temperaturen bis zu maximal dem Siedepunkt einer azeotropen Salzsäure behandelt wird.
Eine vorteilhafte Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß ein Oxidationsmittels der wäßrigen Salzsäure zugesetzt wird.
Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß als Oxidationsmittel eine oder mehrere Substanzen aus folgenden Verbindungen Salpetersäure, Chlor, Wasserstoffperoxid, Chlor - Sauerstoffverbindungen, andere chlorhaltige Säuren wie Perchlorsäure, Chromsauerstoffverbindungen wie CrO3 und Ferrichlorid verwendet wird.
Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß die Zugabe so erfolgt, daß mindestens ein Drittel, vorzugsweise die Hälfte der beim Beizangriff gelösten Metalle in Form von Ferrichlorid vorliegt.
Eine vorteilhafte Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß der Gehalt an Ferrichlorid in der Beizlösung durch Messung der Dichte, Leitfähigkeit, Redoxpotential oder photometrisch sowie einer Kombination dieser Meßmethoden bestimmt wird, wobei der Gehalt an Ferrichlorid auf Basis des Meßwertes eingestellt bzw. geregelt werden kann.The invention is therefore characterized in that the stainless steel is treated in an aqueous solution of hydrochloric acid at temperatures of at least 40 ° C.
A favorable embodiment of the invention is characterized in that the stainless steel is treated in an aqueous solution of hydrochloric acid at temperatures up to a maximum of the boiling point of an azeotropic hydrochloric acid.
An advantageous development of the invention is characterized in that an oxidizing agent is added to the aqueous hydrochloric acid.
A favorable further development of the invention is characterized in that one or more substances from the following compounds nitric acid, chlorine, hydrogen peroxide, chlorine-oxygen compounds, other chlorine-containing acids such as perchloric acid, chromium oxygen compounds such as CrO 3 and ferric chloride are used as the oxidizing agent.
An advantageous embodiment of the invention is characterized in that the addition takes place in such a way that at least one third, preferably half, of the metals dissolved in the pickling attack is in the form of ferric chloride.
An advantageous development of the invention is characterized in that the content of ferrichloride in the pickling solution is determined by measuring the density, conductivity, redox potential or photometrically and a combination of these measurement methods, the content of ferrichloride being able to be set or regulated on the basis of the measured value .

Ausführungsbeispiele:Examples: Beispiel 1example 1

An einer Beizanlage, bestehend aus 3 Beizbottichen mit je 20 m Länge wurden mit einem Edelstahlband der Qualität AlSl 409 Beizversuche durchgeführt. Die Betriebsbedingungen für die Anlage waren:

  • 1. Beizbottich 216 g Summe HCl, 85 g Eisen gelöst, davon 84 g als Fe 2+ und ca. 1 g Fe 3+ , 9 g Cr 3+ /l
  • 2. Beizbottich 200 g Summe HCl, 60 g Eisen gelöst, davon 60 g als Fe 2+, 7 g Cr3+ /l
  • 3. Beizbottich 195 g Summe HCl, 35 g Eisen gelöst, davon 33 g als Fe 2+, 2 g als Fe3+, 4 g Cr 3+ /l
    • Temperatur in allen Beizbottichen 80 °C ± 2 °C. Die Beizsäuren wurden dabei mit einer Menge von 150 m3/h aus den Beizbottichen zugeordneten Zirkulationstanks in den Beizbottich gepumpt und diese Menge lief über die Abläufe wieder in den Zirkulationstank zurück.On a pickling line consisting of 3 pickling tanks, each 20 m long, a stainless steel band of quality AlSl 409 pickling tests were carried out. The operating conditions for the plant were:
  • 1. Pickling tub 216 g total HCl, 85 g iron dissolved, of which 84 g as Fe 2+ and approx. 1 g Fe 3+ , 9 g Cr 3+ / l
  • 2. Pickling tub 200 g total HCl, 60 g iron dissolved, of which 60 g as Fe 2+ , 7 g Cr 3+ / l
  • 3rd pickling tank 195 g total HCl, 35 g iron dissolved, of which 33 g as Fe 2+ , 2 g as Fe 3+ , 4 g Cr 3+ / l
    • Temperature in all pickling tanks 80 ° C ± 2 ° C. The pickling acids were pumped with a quantity of 150 m 3 / h from the circulation tanks assigned to the pickling tanks into the pickling tank and this amount ran back into the circulation tank via the processes.

    Das erste Band wurde mit 30 m/min durch die Beizbottiche bewegt ( Beizzeit 120 sec. ) und war nach der Beize nahezu ungebeizt. Das gleiche Band wurde ein weiteres Mal durch die Beizbottiche gezogen und war danach erst zu ca. 50 % entzundert. Erst nach einem weiteren Transport durch die Beizbottiche, diesmal mit einer Geschwindigkeit von 15 m/min war das Band zunderfrei. Die gesamte Beizzeit betrug daher 480 sec.The first belt was moved through the pickling tanks at 30 m / min (pickling time 120 sec.) And was almost unpickled after pickling. The same band was pulled through the pickling tanks again and was after only about 50% descaled. Only after another transport through the pickling tub, this time at a speed of 15 m / min the tape is scale-free. The total pickling time was therefore 480 sec.

    Beispiel 2Example 2

    Vor dem nächsten Bund wurde durch Einleiten von gasförmigem Chlor in die Zirkulationstanks bzw. in die Beizbottiche die Konzentration an Ferrichlorid in den Beizbottichen auf folgende Werte eingestellt:

  • 1. Beizbottich 216 g Summe HCl, 85 g Eisen gelöst, davon 54 g als Fe 2+ und ca. 31 g Fe 3+ ,9 g Cr3+ /l
  • 2. Beizbottich 200 g Summe HCl, 60 g Eisen gelöst, davon 38 g als Fe 2+, 22 g Fe 3+, 7 g Cr 3+ /l
  • 3. Beizbottich 195 g Summe HCl, 35 g Eisen gelöst, davon 22 g als Fe 2+, 13 g als Fe 3+, 4 g Cr 3+ /l
    • Temperatur in allen Beizbottichen 80 °C ± 2 °C
    Auch bei der reduzierten Geschwindigkeit von 15 m/min mußte das Band zwei Mal durch die Beizbottiche transportiert werden, um eine vollständig zunderfreie Oberfläche zu erzielen. Die gesamte Beizzeit betrug daher unverändert 480 sec.Before the next bundle, gaseous chlorine was introduced into the circulation tanks or pickling tanks to adjust the concentration of ferrichloride in the pickling tanks to the following values:
  • 1. Pickling tub 216 g total HCl, 85 g iron dissolved, 54 g as Fe 2+ and approx. 31 g Fe 3+ , 9 g Cr 3+ / l
  • 2. Pickling tub 200 g total HCl, 60 g iron dissolved, of which 38 g as Fe 2+ , 22 g Fe 3+ , 7 g Cr 3+ / l
  • 3rd pickling tank 195 g total HCl, 35 g iron dissolved, of which 22 g as Fe 2+ , 13 g as Fe 3+ , 4 g Cr 3+ / l
    • Temperature in all pickling tanks 80 ° C ± 2 ° C
    Even at the reduced speed of 15 m / min, the belt had to be transported twice through the pickling tanks to achieve a completely scale-free surface. The total pickling time was therefore unchanged at 480 sec.

    Beispiel 3Example 3

    Die Konzentration an Ferrichlorid wurde daher vor dem nächsten Bund durch Zugabe von Wasserstoffperoxid in die Saugleitungen der Kreislaufpumpen weiter erhöht und auf folgende Werte eingestellt :

  • 1. Beizbottich 216 g Summe HCl, 85 g Eisen gelöst, davon 38 g als Fe 2+ und ca. 47 g Fe 3+, 9 g Cr 3+ /l
  • 2. Beizbottich 200 g Summe HCl, 60 g Eisen gelöst, davon 26 g als Fe 2+, 34 g Fe 3+, 7 g Cr3+ /l
  • 3. Beizbottich 195 g Summe HCl, 35 g Eisen gelöst, davon 15 g als Fe 2+, 20 g als Fe 3+, 4 g Cr3+ /l
    • Temperatur in allen Beizbottichen 80 °C ± 2 °C
    Bereits nach dem ersten Durchlauf durch die Beizbottiche war das Band bei einer Geschwindigkeit von 15 m/min. zunderfrei. Die gesamte Beizzeit betrug bei diesem Versuch nur 240 sec. Durch weitere Zugabe von Oxidationsmitteln, so daß alles Eisen in Form von Ferrichlorid vorlag, konnte die Beizzeit nicht mehr wesentlich verkürzen. ( Beispiel 4 ) Das Diagramm in Fig. 1 zeigt die Ergebnisse dieser Versuche mit der entsprechenden Beizzeitverkürzung gemäß den Beispielen 1, 2, 3 und 4.
    Durch eine Erhöhung der Beiztemperatur auf 90 °C konnte die Geschwindigkeit auf 18 m/min. bei den oben angegebenen Konzentrationen gesteigert werden, so daß die gesamte Beizzeit im Beispiel 3 nur mehr 200 sec. betrug. Die Versuche wurden mit den Beizsäuren wie in den Beispielen 1, 2, 3 und 4 angegeben gemacht, wobei die Temperatur auf 90 °C erhöht wurde. (Fig. 2)
    Weitere Versuche mit Zugabe von anderen Oxidationsmitteln zeigten, daß mindestens 50 % der gelösten Metalle als Ferrichlorid vorliegen müssen, um eine entsprechende Reduktion der Beizzeit zu erzielen. So ergab zum Beispiel der Zusatz von Perchlorsäure zu den Beizbottichen in jeweils 10 Vol. % der vorhandenen Menge eine Reduktion der Beizzeiten gemäß Fig. 3.
    Als besonders vorteilhaft hat es sich auch bei den Versuchen herausgestellt, die Konzentrationen laufend zu überwachen, um sicherzustellen, daß stets ausreichend Oxidationsmittel dem Beizbad zugegeben wird.The concentration of ferrichloride was therefore further increased before the next bunch by adding hydrogen peroxide to the suction lines of the circulation pumps and adjusted to the following values:
  • 1. Pickling tub 216 g total HCl, 85 g iron dissolved, of which 38 g as Fe 2+ and approx. 47 g Fe 3+ , 9 g Cr 3+ / l
  • 2. Pickling tub 200 g total HCl, 60 g iron dissolved, of which 26 g as Fe 2+ , 34 g Fe 3+ , 7 g Cr 3+ / l
  • 3rd pickling tank 195 g total HCl, 35 g iron dissolved, 15 g as Fe 2+ , 20 g as Fe 3+ , 4 g Cr 3+ / l
    • Temperature in all pickling tanks 80 ° C ± 2 ° C
    After the first pass through the pickling tubs, the belt was at a speed of 15 m / min. scale-free. The total pickling time in this experiment was only 240 seconds. The addition of oxidizing agents so that all of the iron was in the form of ferric chloride could not significantly shorten the pickling time. (Example 4) The diagram in FIG. 1 shows the results of these tests with the corresponding reduction in pickling time according to Examples 1, 2, 3 and 4.
    By increasing the pickling temperature to 90 ° C, the speed could be increased to 18 m / min. at the concentrations given above, so that the total pickling time in Example 3 was only 200 seconds. The experiments were carried out with the pickling acids as indicated in Examples 1, 2, 3 and 4, the temperature being raised to 90 ° C. (Fig. 2)
    Further tests with the addition of other oxidizing agents showed that at least 50% of the dissolved metals must be present as ferrichloride in order to achieve a corresponding reduction in the pickling time. For example, the addition of perchloric acid to the pickling tanks in each case 10% by volume of the amount present resulted in a reduction in the pickling times according to FIG. 3.
    It has also proven to be particularly advantageous in the experiments to continuously monitor the concentrations in order to ensure that sufficient oxidizing agent is always added to the pickling bath.

    Versuche mit anderen Edelstahlbändern der Qualitäten AlSl 304, 316 sowie
    AlSl 430 ergaben ähnliche Reduzierungen der Beizzeiten unter den oben angeführten Bedingungen. Die Ergebnisse sind in den Diagrammen in Fig. 4 und Fig. 5 zusammengefasst.     Tests with other stainless steel strips of qualities AlSl 304, 316 and
    AlSl 430 showed similar reductions in pickling times under the conditions listed above. The results are summarized in the diagrams in FIGS. 4 and 5.

    In einer weiteren Serie von Versuchen wurden zwischen den einzelnen Beizbottichen Bürsten installiert, die die Oberfläche des Bandes vom lose anhaftenden Zunder befreiten. Dadurch konnte generell bei allen Versuchen eine weitere Reduktion der Beizzeit von 5 - 10 % erreicht werden. Als besonders vorteilhaft haben sich dabei Bürsten erwiesen, die in ihren Borsten abrasive Partikel wie Siliziumcarbid oder Aluminiumoxid eingebettet hatten.In a further series of experiments between the individual Pickling tanks brushes installed that loosen the surface of the belt free adhering tinder. This meant that in all experiments a further reduction in the pickling time of 5 - 10% can be achieved. Brushes that have proven to be particularly advantageous in their Bristle abrasive particles such as silicon carbide or aluminum oxide are embedded had.

    Claims (12)

    Verfahren zum Beizen von Edelstahl, dadurch gekennzeichnet, daß der Edelstahl in einer wäßrigen Lösung von Salzsäure bei Temperaturen von mindestens 40 °C behandelt wird.Process for pickling stainless steel, characterized in that the stainless steel in an aqueous solution of hydrochloric acid Temperatures of at least 40 ° C is treated. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Edelstahl in einer wäßrigen Lösung von Salzsäure bei Temperaturen bis zu maximal dem Siedepunkt einer azeotropen Salzsäure behandelt wird.A method according to claim 1, characterized in that the stainless steel in an aqueous solution of hydrochloric acid at temperatures up to treated to a maximum of the boiling point of an azeotropic hydrochloric acid becomes. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß ein Oxidationsmittels der wäßrigen Salzsäure zugesetzt wird.A method according to claim 1 or 2, characterized in that an oxidizing agent is added to the aqueous hydrochloric acid. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß als Oxidationsmittel eine oder mehrere Substanzen aus folgenden Verbindungen Salpetersäure, Chlor, Wasserstoffperoxid, Chlor - Sauerstoffverbindungen, andere chlorhaltige Säuren wie Perchlorsäure, Chromsauerstofftverbindungen wie CrO3 und Ferrichlorid verwendet wird.A method according to claim 3, characterized in that one or more substances from the following compounds nitric acid, chlorine, hydrogen peroxide, chlorine-oxygen compounds, other chlorine-containing acids such as perchloric acid, chromium oxygen compounds such as CrO 3 and ferric chloride are used as the oxidizing agent. Verfahren nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß die Zugabe so erfolgt, daß mindestens ein Drittel, vorzugsweise die Hälfte der beim Beizangriff gelösten Metalle in Form von Ferrichlorid vorliegt.A method according to claim 1 to 3, characterized in that the The addition is such that at least one third, preferably the Half of the metals dissolved in the pickling attack in the form of ferrichloride is present. Verfahren nach einem der obigen Ansprüche, dadurch gekennzeichnet, daß der Gehalt an Ferrichlorid in der Beizlösung durch Messung der Dichte, Leitfähigkeit, Redoxpotential oder photometrisch sowie einer Kombination dieser Meßmethoden bestimmt wird. Method according to one of the above claims, characterized characterized in that the content of ferrichloride in the pickling solution by measuring the density, conductivity, redox potential or photometrically and a combination of these measurement methods is determined. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß der Gehalt an Ferrichlorid auf Basis des Meßwertes eingestellt bzw. geregelt wird.A method according to claim 6, characterized in that the Ferrichloride content adjusted based on the measured value or is regulated. Verfahren nach einem der Ansprüche 3 bis 7, dadurch gekennzeichnet, daß die Zugabe des Oxidationsmittels proportional der durchgesetzten Bandoberfläche erfolgt.Method according to one of claims 3 to 7, characterized characterized in that the addition of the oxidizing agent is proportional the enforced belt surface takes place. Verfahren nach einem der Ansprüche 3 bis 7, dadurch gekennzeichnet, daß die Zugabe des Oxidationsmittels proportional den durch die Beizanlage durchgesetzten Tonnen erfolgt.Method according to one of claims 3 to 7, characterized characterized in that the addition of the oxidizing agent is proportional the tons passed through the pickling plant. Verfahren nach einem der Ansprüche 3 bis 9, dadurch gekennzeichnet, daß die Zugabe des Oxidationsmittels in die Saugleitung der Umwälzpumpe jedes einzelnen Beizbottichs erfolgt.Method according to one of claims 3 to 9, characterized in that that the addition of the oxidant to the suction line the circulation pump of each individual pickling tub. Verfahren nach einem der Ansprüche 3 bis 9, dadurch gekennzeichnet, daß die Zugabe des Oxidationsmittels in den jeden Beizbottich zugeordneten Zirkulationstank erfolgt.Method according to one of claims 3 to 9, characterized in that that the addition of the oxidizing agent in each pickling tub assigned circulation tank. Verfahren nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß zwischen den einzelnen Beizbottichen Bürsten installiert sind, die die Oberfläche des Bandes mechanisch reinigen.Method according to one of claims 1 to 11, characterized in that that brushes between the individual pickling tanks installed that mechanically clean the surface of the belt.
    EP99111754A 1998-07-15 1999-06-18 Process for pickling stainless steel Expired - Lifetime EP0972854B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    AT121798 1998-07-15
    AT0121798A AT407755B (en) 1998-07-15 1998-07-15 METHOD FOR STAINLESSING STAINLESS STEEL

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    EP0972854A2 true EP0972854A2 (en) 2000-01-19
    EP0972854A3 EP0972854A3 (en) 2000-07-19
    EP0972854B1 EP0972854B1 (en) 2005-05-04

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    US (1) US6250314B1 (en)
    EP (1) EP0972854B1 (en)
    KR (1) KR100592567B1 (en)
    AT (1) AT407755B (en)
    DE (1) DE59912005D1 (en)
    ES (1) ES2242330T3 (en)
    TW (1) TW475008B (en)

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    CN103695940A (en) * 2013-11-29 2014-04-02 明光市留香泵业有限公司 Water-soluble antioxidant derusting antirust liquid and preparation method thereof
    CN103695925A (en) * 2013-11-29 2014-04-02 明光市留香泵业有限公司 Water-soluble conversion-type antirust liquid and preparation method thereof

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