EP0069009B1 - Process for degreasing cold rolled metal strip - Google Patents

Process for degreasing cold rolled metal strip Download PDF

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Publication number
EP0069009B1
EP0069009B1 EP82401144A EP82401144A EP0069009B1 EP 0069009 B1 EP0069009 B1 EP 0069009B1 EP 82401144 A EP82401144 A EP 82401144A EP 82401144 A EP82401144 A EP 82401144A EP 0069009 B1 EP0069009 B1 EP 0069009B1
Authority
EP
European Patent Office
Prior art keywords
heating
degreasing
band
enclosure
carried out
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
Application number
EP82401144A
Other languages
German (de)
French (fr)
Other versions
EP0069009A1 (en
Inventor
Robert Wang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fives Stein SA
Original Assignee
Stein Heurtey SA
Fives Stein SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stein Heurtey SA, Fives Stein SA filed Critical Stein Heurtey SA
Priority to AT82401144T priority Critical patent/ATE23369T1/en
Publication of EP0069009A1 publication Critical patent/EP0069009A1/en
Application granted granted Critical
Publication of EP0069009B1 publication Critical patent/EP0069009B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0269—Cleaning
    • B21B45/0275—Cleaning devices
    • B21B45/0278—Cleaning devices removing liquids
    • B21B45/0284—Cleaning devices removing liquids removing lubricants

Definitions

  • the present invention relates to the degreasing of a cold rolled metal strip.
  • degreasing is carried out during the annealing operation.
  • An example of implementation of this technique is described in FR-A-2 308 436, which relates to a process for removing residual traces of lubricant on the internal wall of copper tubes, by decomposition of said lubricant during the operation of annealing, the tubes being simultaneously heated to an appropriate temperature to develop a vapor pressure sufficient for the lubricant, and traversed by a gaseous fluid ensuring the sweeping of the lubricant vapors during heating.
  • the degreasing is carried out at the same time as the heating of the strip, by a chemical effect of the fumes at high temperature and resulting from a sub-stoichiometric combustion, on the oil layer of the strip.
  • This chemical effect results in a rapid evaporation of the oil layer covering the strip and its decomposition in the gas phase, into simple hydro-carbides, therefore comparable to those contained in the fuels used for heating the strip.
  • This decomposition is facilitated by the presence of water vapor in the fumes.
  • the final balance of the fumes is very close to that which normally results from combustion without the presence of oil on the strip.
  • the present invention proposes to provide such a method.
  • the invention therefore relates to a method of degreasing a cold-rolled strip, according to which the degreasing is carried out at the same time as the heating of the strip, by chemical effect of the fumes at high temperature on the oil layer.
  • the heating and degreasing actions are separate: the heating being carried out in an enclosure provided with means for supplying heat by radiation, and the degreasing being obtained by chemical effect in the heating enclosure, of a gas resulting from a substoichiometric combustion of a fuel.
  • the strip to be degreased is brought to the temperature generally necessary for carrying out degreasing by smoke effect, that is to say from 450 to 600 ° C.
  • the atmosphere of the enclosure heating consists of fumes from the combustion of a gaseous fuel, carried out outside or inside the enclosure, but whose essential purpose is not to participate in the heating of the strip.
  • the sub-stoichiometric combustion is carried out with a rate of unburnt substances of between 0.5 and 10%.
  • the gas thus produced has, for an oven or an enclosure of medium industrial size, a flow rate between 100 and 500 Nm 3 / hour, which represents approximately 5% of the flow rates practiced in gas-heated ovens.
  • Such a flow makes it possible both to renew the gas responsible for eliminating the evaporated oil, and to maintain the pressure of the furnace at a value greater than the ambient pressure.
  • a flow rate makes it possible to maintain the oven at a certain temperature during its periods of shutdown.
  • the temperature of the heating enclosure does not exceed 1000 ° C., a temperature which, combined with that of the strip, makes it possible to ensure rapid evaporation of the oil without causing an undesirable band oxidation effect, an effect which, in a gas-heated oven, occurs in a temperature range between 1000 and 1200 ° C.
  • the fumes discharged from the heating enclosure can undergo a treatment in order to burn the unburnt products resulting from the sub-stoichiometric combustion and from the evaporation of the oil.
  • the fumes thus treated can, after burning, be used again to preheat air, which will subsequently be used during combustion, to produce the atmospheric gas of the heating and degreasing enclosure.
  • the heating enclosure can be produced so as to obtain a small distance between the heating elements (or the walls of the enclosure) and the strip to be degreased.
  • the purpose of this short distance is to eliminate both the absorption of the radiation by the fumes constituting the atmosphere of the furnace, and which include water vapor and carbon dioxide, and to promote the renewal of this gas d the atmosphere at the level of the band by a convective effect resulting from a rapid flow.
  • the oil heating and evaporation enclosure is preferably constituted in the form of a narrow chamber ensuring passage and rapid renewal of the atmospheric gas at the level of the strip.
  • the method according to the invention applies particularly to all types of annealing ovens in which the electro-chemical degreasing of the strip can be replaced by a degreasing by flame, for example: annealing oven before galvanization, before tinning, annealing continuous black sheets, etc.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

1. A method of degreasing a cold rolled band wherein the degreasing and the heating of the band are carried out simultaneously, through a chemical effect of the fumes at a high temperature on the oil layer present on the band, characterized in that the heating and degreasing actions are separated, the heating being carried out in an enclosure provided with radiant heating means, and the degreasing being obtained through a chemical effect, in the heating enclosure, of a gas resulting from a sub-stoichiometric combustion.

Description

La présénte invention concerne le dégraissage d'une bande métallique laminée à froid.The present invention relates to the degreasing of a cold rolled metal strip.

On sait que les bandes métalliques laminées à froid sont recouvertes d'une couche résiduelle d'huile de laminage. Cette huile doit être enlevée avant ou au cours des opérations de recuit en continu, ou de recuit suivi de métallisation. En général, on réalise le dégraissage avant le recuit, en mettant en oeuvre un processus chimique ou électro-chimique qui comporte des étapes de dégraissage proprement dit, de brossage, de rinçage et de séchage de la bande.It is known that the cold-rolled metal strips are covered with a residual layer of rolling oil. This oil must be removed before or during continuous annealing operations, or annealing followed by metallization. In general, degreasing is carried out before annealing, by implementing a chemical or electro-chemical process which comprises stages of actual degreasing, brushing, rinsing and drying of the strip.

Dans certains cas, on effectue le dégraissage pendant l'opération de recuit. Un exemple de mise en oeuvre de cette technique est décrit dans FR-A- 2 308 436, qui vise un procédé d'élimination des traces résiduelles de lubrifiant sur la paroi interne de tubes de cuivre, par décomposition dudit lubrifiant pendant l'opération de recuit, les tubes étant simultanément chauffés à une température appropriée pour développer une tension de vapeur suffisant au lubrifiant, et parcourus par un fluide gazeux assurant le balayage des vapeurs de lubrifiant pendant le chauffage.In some cases, degreasing is carried out during the annealing operation. An example of implementation of this technique is described in FR-A-2 308 436, which relates to a process for removing residual traces of lubricant on the internal wall of copper tubes, by decomposition of said lubricant during the operation of annealing, the tubes being simultaneously heated to an appropriate temperature to develop a vapor pressure sufficient for the lubricant, and traversed by a gaseous fluid ensuring the sweeping of the lubricant vapors during heating.

Dans d'autres cas, le dégraissage est effectué en même temps que le chauffage de la bande, par un effet chimique des fumées à haute température et résultant d'une combustion sous-stoechiométrique, sur la couche d'huile de la bande. Cet effet chimique se traduit par une évaporation rapide de la couche d'huile recouvrant la bande et sa décomposition en phase gazeuse, en hydro-carbures simples, donc assimilables à ceux que contiennent les combustibles utiliés pour le chauffage de la bande. Cette décomposition est facilitée par la présence de vapeur d'eau dans les fumées. L'équilibre final des fumées est très proche de celui qui résulte normalement de la combustion sans présence d'huile sur la bande.In other cases, the degreasing is carried out at the same time as the heating of the strip, by a chemical effect of the fumes at high temperature and resulting from a sub-stoichiometric combustion, on the oil layer of the strip. This chemical effect results in a rapid evaporation of the oil layer covering the strip and its decomposition in the gas phase, into simple hydro-carbides, therefore comparable to those contained in the fuels used for heating the strip. This decomposition is facilitated by the presence of water vapor in the fumes. The final balance of the fumes is very close to that which normally results from combustion without the presence of oil on the strip.

Bien entendu, le dégraissage par effet chimique des fumées à haute température n'est applicable dans son intégralité que dans des fours chauffés au gaz ou à l'aide d'un combustible liquide léger, tel que le kérosène ou le mazout domestique.Of course, degreasing by chemical effect of smoke at high temperature is only fully applicable in ovens heated with gas or using a light liquid fuel, such as kerosene or heating oil.

Dans certains cas, il est préférable de pouvoir réaliser un dégraissage par effet chimique d'un gaz ambiant au cours d'un chauffage électrique, et il est alors nécessaire de concevoir un procédé différent de celui décrit ci-dessus.In certain cases, it is preferable to be able to carry out a degreasing by chemical effect of an ambient gas during an electric heating, and it is then necessary to design a process different from that described above.

La présente invention se propose d'apporter un tel procédé.The present invention proposes to provide such a method.

L'invention vise, en conséquence, un procédé de dégraissage d'une bande laminée à froid, selon lequel le dégraissage est effectué en même temps que le chauffage de la bande, par effet chimique des fumées à haute température sur la couche d'huile présente sur la bande, caractérisé en ce que les actions chauffage et dégraissage sont séparées: le chauffage étant effectué dans une enceinte pourvue de moyens d'apport de chaleur par rayonnement, et le dégraissage étant obtenu par effet chimique dans l'enceinte de chauffage, d'un gaz resultant d'une combustion sous-stoechiométrique d'un combustible.The invention therefore relates to a method of degreasing a cold-rolled strip, according to which the degreasing is carried out at the same time as the heating of the strip, by chemical effect of the fumes at high temperature on the oil layer. present on the strip, characterized in that the heating and degreasing actions are separate: the heating being carried out in an enclosure provided with means for supplying heat by radiation, and the degreasing being obtained by chemical effect in the heating enclosure, of a gas resulting from a substoichiometric combustion of a fuel.

Lors de l'étape de chauffage, la bande à dégraisser est portée à la température généralement nécessaire à la réalisation du dégraissage par effet de fumée, c'est-à-dire de 450 à 600°C, L'atmosphère de l'enceinte de chauffage est constituée par des fumées issues de la combustion d'un combustible gazeux, réalisée à l'extérieur ou à l'intérieur de l'enceinte, mais dont le but essentiel n'est pas de participer au chauffage de la bande.During the heating stage, the strip to be degreased is brought to the temperature generally necessary for carrying out degreasing by smoke effect, that is to say from 450 to 600 ° C., The atmosphere of the enclosure heating consists of fumes from the combustion of a gaseous fuel, carried out outside or inside the enclosure, but whose essential purpose is not to participate in the heating of the strip.

Selon une caractéristique de cette invention, la combustion sous-stoechiométrique, en pré-mélange ou non, est réalisée avec un taux d'imbrûlés compris entre 0,5 et 10 %. Le gaz ainsi produit présente, pour un four ou une enceinte de taille industrielle moyenne, un débit comnpris entre 100 et 500 Nm3/heure, ce qui représente environ 5 % des débits pratiqués dans les fours chauffés au gaz. Un tel débit permet à la fois de renouveler le gaz chargé d'éliminer l'huile évaporée, et de maintenir la pression du four à une valeur supérieure à la pression ambiante. Par ailleurs, un tel débit permet de maintenir le four à une certaine température lors de ses périodes d'arrêt.According to a characteristic of this invention, the sub-stoichiometric combustion, whether premixed or not, is carried out with a rate of unburnt substances of between 0.5 and 10%. The gas thus produced has, for an oven or an enclosure of medium industrial size, a flow rate between 100 and 500 Nm 3 / hour, which represents approximately 5% of the flow rates practiced in gas-heated ovens. Such a flow makes it possible both to renew the gas responsible for eliminating the evaporated oil, and to maintain the pressure of the furnace at a value greater than the ambient pressure. Furthermore, such a flow rate makes it possible to maintain the oven at a certain temperature during its periods of shutdown.

Compte tenu des conditions précisées ci-dessus, propres à la présente invention, la température de l'enceinte de chauffage ne dépasse pas 1000°C, température qui, comninée à celle de la bande, permet d'assurer une évaporation rapide de l'huile sans provoquer d'effet indésirable d'oxydation de la bande, effet qui, dans un four chauffé au gaz, se présente dans une gamme de températures située entre 1000 et 1200° C.Taking into account the conditions specified above, specific to the present invention, the temperature of the heating enclosure does not exceed 1000 ° C., a temperature which, combined with that of the strip, makes it possible to ensure rapid evaporation of the oil without causing an undesirable band oxidation effect, an effect which, in a gas-heated oven, occurs in a temperature range between 1000 and 1200 ° C.

Selon une autre caractéristique de cette invention, les fumées évacuées de l'enceinte de chauffage peuvent subir un traitement en vue de brûler les imbrûlés résultant de la combustion sous-stoechiométrique et de l'évaporation de l'huile. Les fumées ainsi traitées peuvent, après brûlage, être utilisées à nouveau pour préchauffer de l'air, qui sera ultérieurement employé lors de la combustion, pour produire le gaz d'atmosphère de l'enceinte de chauffage et de dégraissage.According to another characteristic of this invention, the fumes discharged from the heating enclosure can undergo a treatment in order to burn the unburnt products resulting from the sub-stoichiometric combustion and from the evaporation of the oil. The fumes thus treated can, after burning, be used again to preheat air, which will subsequently be used during combustion, to produce the atmospheric gas of the heating and degreasing enclosure.

Selon cette invention, l'enceinte de chauffage peut être réalisée de façon à obtenir une faible distance entre les éléments chauffants (ou les parois de l'enceinte) et la bande à dégraisser. Cette faible distance a pour but d'éliminer à la fois l'absorption du rayonnement par les fumées constituant l'atmosphère du four, et qui comprennent de la vapeur d'eau et du gaz carbonique, et de favoriser le renouvellement de ce gaz d'atmosphère au niveau de la bande par un effet convectif résultant d'un écoulement rapide. Par ailleurs, toujours selon l'invention, l'enceinte de chauffage et d'évaporation de l'huile est constituée, de préférence, sous la forme d'une chambre étroite assurant un passage et un renouvellement rapides du gaz d'atmosphère au niveau de la bande.According to this invention, the heating enclosure can be produced so as to obtain a small distance between the heating elements (or the walls of the enclosure) and the strip to be degreased. The purpose of this short distance is to eliminate both the absorption of the radiation by the fumes constituting the atmosphere of the furnace, and which include water vapor and carbon dioxide, and to promote the renewal of this gas d the atmosphere at the level of the band by a convective effect resulting from a rapid flow. Furthermore, still according to the invention, the oil heating and evaporation enclosure is preferably constituted in the form of a narrow chamber ensuring passage and rapid renewal of the atmospheric gas at the level of the strip.

Le procédé selon l'invention s'applique particulièrement à tous les types de fours de recuit dans lesquels le dégraissage électro-chimique de la bande peut être remplacé par un dégraissage par flamme, par exemple: four de recuit avant galvanisation, avant étamage, recuit continu de tôles noires, etc.The method according to the invention applies particularly to all types of annealing ovens in which the electro-chemical degreasing of the strip can be replaced by a degreasing by flame, for example: annealing oven before galvanization, before tinning, annealing continuous black sheets, etc.

Claims (6)

1. A method of degreasing a cold rolled band wherein the degreasing and the heating of the . band are carried out simultaneously, through a chemical effect of the fumes at a high temperature on the oil layer present on the band, characterized in that the heating and degreasing actions are separated, the heating being carried out in an enclosure provided with radiant heating means, and the degreasing being obtained through a chemical effect, in the heating enclosure, of a gas resulting from a sub-stoichiometric combustion.
2. A method according to claim 1, characterized in that the band is brought, during said heating step, at the temperature necessary for providing the degreasing through a fume effect, i.e. between 450 and 600° C.
3. A method according to one of the preceding claims, characterized in that the heating enclosure atmosphere is formed by fumes arising from the combustion of a gaseous fuel, carried out either inside or outside the enclosure.
4. A method according to claim 3, characterized in that said sub-stoichiometric combustion is carried out in a pre-mixture or not, with a rate of unburnt residues between 0.5 and 10 %.
5. A method according to claim 4, characterized in that the fumes evacuated from the heating enclosure are treated to burn unburnt residues resulting from the sub-stoichiometric combustion and the evaporation of the oil, thereby preheating the air used thereafter in the combustion producing the atmosphere gas.
6. A method according to any one of the preceding claims, characterized in that the heating enclosure is realized in the form of a narrow chamber, designed so as to obtain a small distance between the heating elements or the emclosure walls and the band, and allowing a quick passage and renewal of the atmospheric gas at the level of the band to be degreased.
EP82401144A 1981-06-23 1982-06-22 Process for degreasing cold rolled metal strip Expired EP0069009B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82401144T ATE23369T1 (en) 1981-06-23 1982-06-22 PROCESS FOR DEGREASING COLD ROLLED METAL STRIPS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8112289 1981-06-23
FR8112289A FR2508064B1 (en) 1981-06-23 1981-06-23 PROCESS FOR DEGREASING A COLD ROLLED BELT

Publications (2)

Publication Number Publication Date
EP0069009A1 EP0069009A1 (en) 1983-01-05
EP0069009B1 true EP0069009B1 (en) 1986-11-05

Family

ID=9259773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401144A Expired EP0069009B1 (en) 1981-06-23 1982-06-22 Process for degreasing cold rolled metal strip

Country Status (5)

Country Link
EP (1) EP0069009B1 (en)
AT (1) ATE23369T1 (en)
CA (1) CA1191434A (en)
DE (1) DE3274121D1 (en)
FR (1) FR2508064B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2562562B1 (en) * 1984-04-04 1986-08-08 Stein Heurtey METHOD AND DEVICE FOR CONTINUOUS CLEANING OF A METAL STRIP
FR2562563B1 (en) * 1984-04-05 1988-09-23 Stein Heurtey PROCESS FOR DEGREASING A COLD-ROLLED METAL STRIP
DE3580055D1 (en) * 1984-04-05 1990-11-15 Stein Heurtey DEGREASING METHOD FOR COLD ROLLED STEEL TAPE.
FR2571064B2 (en) * 1984-09-28 1988-11-25 Stein Heurtey PROCESS FOR DEGREASING A COLD-ROLLED METAL STRIP
JPH09170091A (en) * 1995-12-19 1997-06-30 Kanto Yakin Kogyo Kk Method for removing vapor of oil-component of metal worked article

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2288980A (en) * 1941-10-30 1942-07-07 Gen Properties Company Inc Method of cleaning metals
DE1546215A1 (en) * 1965-11-06 1970-03-19 Vacuumschmelze Gmbh Continuous degreasing through resistance heating
FR1568732A (en) * 1966-05-16 1969-05-30
FR2308436A1 (en) * 1975-04-25 1976-11-19 Cit Alcatel Avoiding carbon deposits during annealing, from lubricants - in the bore of drawn copper tubes, by sweeping with nitrogen
DE2928084C2 (en) * 1979-07-12 1987-01-02 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover Process for treating copper pipes

Also Published As

Publication number Publication date
EP0069009A1 (en) 1983-01-05
FR2508064A1 (en) 1982-12-24
FR2508064B1 (en) 1987-07-10
DE3274121D1 (en) 1986-12-11
ATE23369T1 (en) 1986-11-15
CA1191434A (en) 1985-08-06

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