EP0069009B1 - Verfahren zum Entfetten von kaltgewalzten Metallbändern - Google Patents

Verfahren zum Entfetten von kaltgewalzten Metallbändern 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
English (en)
French (fr)
Other versions
EP0069009A1 (de
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/de
Publication of EP0069009A1 publication Critical patent/EP0069009A1/de
Application granted granted Critical
Publication of EP0069009B1 publication Critical patent/EP0069009B1/de
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)

Claims (6)

1. Verfahren zum Entfetten von kaltgewalzten Metallbändern bei dem das Entfetten gleichzeitig mit dem Aufheizen des Bandes auf chemischem Wege mittels stark erhitzter Dämpfe ausgeführt wird, welche auf die auf dem Band vorhandene Ölschicht einwirken, dadurch gekennzeichnet, daß das Aufheizen und das Entfetten des Bandes räumlich getrennt voneinander ausgeführt werden, wobei das Aufheizen des Bandes in einem Raum der Wärmezufuhreinrichtung mittels Wärmestrahlung ausgeführt wird, und wobei das Entfetten des Bandes auf chemischem Wege im Heizungsraum mittels eines bei der Verbrennung eines Brennstoffes in einem Stochiometrischen Unterschuß entstehenden Gases erreicht wird.
2. Verfahren nach. Anspruch 1, dadurch gekennzeichnet, daß das Band während des Aufheizvorganges auf der für die Durchführung der Dampfentfettung notwendigen Temperatur, vor allem auf einer Temperatur zwischen 450 und 600 °C gehalten wird.
3. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Atmosphäre des Heizraumes aus von der Verbrennung eines gasförmigen Brennstoffes herrührenden Dämpfen aufgebaut wird, wobei die Verbrennung entweder innerhalb oder außerhalb des Heizraumes durchgeführt wird.
4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die im stöchiometrischen Sinne nicht vollständige Verbrennung mit einem Rückstandsanteil zwischen 0,5 und 10 %, gegebenenfalls unter Vormischung durchgeführt wird.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die vom Heizraum abgezogenen Dämpfe zur Verbrennung der bei der unvollständigen Verbrennung anfallenden Rückstände ebenso aufbereitet werden wie zur Verdampfung des Öls und zur Vorwärmung der Luft, die nachfolgend in der die Gasatmosphäre erzeugenden Verbrennung benötigt wird.
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Heizraum unter Gewährleistung eines geringen Abstandes zwischen den Heizelementen oder den Raumwänden und dem Band als schmale Kammer ausgebildet ist, und damit auf dem Niveau des zu entfettenden Bandes einen großen Durchsatz sowie einen raschen Austausch der Gasatmosphäre erlaubt.
EP82401144A 1981-06-23 1982-06-22 Verfahren zum Entfetten von kaltgewalzten Metallbändern Expired EP0069009B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82401144T ATE23369T1 (de) 1981-06-23 1982-06-22 Verfahren zum entfetten von kaltgewalzten metallbaendern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8112289A FR2508064B1 (fr) 1981-06-23 1981-06-23 Procede de degraissage d'une bande laminee a froid
FR8112289 1981-06-23

Publications (2)

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

Family

ID=9259773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401144A Expired EP0069009B1 (de) 1981-06-23 1982-06-22 Verfahren zum Entfetten von kaltgewalzten Metallbändern

Country Status (5)

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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2562562B1 (fr) * 1984-04-04 1986-08-08 Stein Heurtey Procede et dispositif de nettoyage en continu d'une bande metallique
FR2571064B2 (fr) * 1984-09-28 1988-11-25 Stein Heurtey Procede de degraissage d'une bande metallique laminee a froid
EP0157708B1 (de) * 1984-04-05 1990-10-10 Stein Heurtey Entfettungsverfahren für kaltgewalztes Stahlband
FR2562563B1 (fr) * 1984-04-05 1988-09-23 Stein Heurtey Procede de degraissage d'une bande metallique laminee a froid
JPH09170091A (ja) * 1995-12-19 1997-06-30 Kanto Yakin Kogyo Kk 金属加工品の油分の蒸発除去方法

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 (de) * 1965-11-06 1970-03-19 Vacuumschmelze Gmbh Durchlaufentfettung durch Widerstandserwaermung
FR1568732A (de) * 1966-05-16 1969-05-30
FR2308436A1 (fr) * 1975-04-25 1976-11-19 Cit Alcatel Traitement des tubes en cuivre et alliages en vue de l'elimination des produits carbones subsistant a leur surface
DE2928084C2 (de) * 1979-07-12 1987-01-02 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover Verfahren zum Behandeln von Kupferrohren

Also Published As

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

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