EP0069009B1 - Verfahren zum Entfetten von kaltgewalzten Metallbändern - Google Patents
Verfahren zum Entfetten von kaltgewalzten Metallbändern Download PDFInfo
- 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
Links
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)
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)
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)
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 |
-
1981
- 1981-06-23 FR FR8112289A patent/FR2508064B1/fr not_active Expired
-
1982
- 1982-06-22 DE DE8282401144T patent/DE3274121D1/de not_active Expired
- 1982-06-22 AT AT82401144T patent/ATE23369T1/de not_active IP Right Cessation
- 1982-06-22 CA CA000405718A patent/CA1191434A/fr not_active Expired
- 1982-06-22 EP EP82401144A patent/EP0069009B1/de not_active Expired
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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