EP0157708B1 - Entfettungsverfahren für kaltgewalztes Stahlband - Google Patents

Entfettungsverfahren für kaltgewalztes Stahlband Download PDF

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Publication number
EP0157708B1
EP0157708B1 EP85400669A EP85400669A EP0157708B1 EP 0157708 B1 EP0157708 B1 EP 0157708B1 EP 85400669 A EP85400669 A EP 85400669A EP 85400669 A EP85400669 A EP 85400669A EP 0157708 B1 EP0157708 B1 EP 0157708B1
Authority
EP
European Patent Office
Prior art keywords
degreasing
atmosphere
hydrogen
injected
steam
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 - Lifetime
Application number
EP85400669A
Other languages
English (en)
French (fr)
Other versions
EP0157708A2 (de
EP0157708A3 (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
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
Priority claimed from FR8405366A external-priority patent/FR2562563B1/fr
Priority claimed from FR8414950A external-priority patent/FR2571064B2/fr
Application filed by Stein Heurtey SA filed Critical Stein Heurtey SA
Priority to AT85400669T priority Critical patent/ATE57396T1/de
Publication of EP0157708A2 publication Critical patent/EP0157708A2/de
Publication of EP0157708A3 publication Critical patent/EP0157708A3/fr
Application granted granted Critical
Publication of EP0157708B1 publication Critical patent/EP0157708B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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 a method for degreasing a cold-rolled metal strip, and more particularly a continuously treated strip, preferably a ferrous strip, or a copper strip.
  • the atmosphere used is constituted by a mixture of N 2 , H 2 , H 2 0, C0 2 , and CO, and it results from a sub-stoichiometric combustion of a fossil fuel (gas or fuel ).
  • Total degreasing of the metal strip is therefore obtained by heating and cracking the oils, by chemical action of the gases in the atmosphere of the fumes from the combustion of this fossil fuel.
  • the atmosphere having the composition specified in the prior patent therefore comprises reducing gases (H 2 and CO), and also oxidizing gases (H 2 0 and C0 2 ).
  • N Z -H 2 -H 2 0 mixture comprising a single reducing gas and a single oxidizing gas, of a particular composition, gives the same effects as a mixture with two components of each kind.
  • the present invention 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 at high temperature of an atmosphere of suitable composition, on the oil layer present on the strip, in an enclosure provided with means for supplying heat by radiation, in which the heating and degreasing actions are carried out separately and independently, characterized in that said atmosphere consists essentially of a mixture of nitrogen and hydrogen enriched in water vapor injected into said degreasing section in which the hydrogen content is between 2 and 30% and the water vapor content is between 5 and 30% of the gas mixture filling the enclosure.
  • the metal strip can be brought, by the radiant heating means, to a temperature between 350 and 700 ° C., necessary for carrying out degreasing by chemical effect of the atmosphere.
  • the injected gas mixture can be preheated to a temperature of the order of 700 ° C, by any suitable means.
  • the water vapor from the atmosphere can be injected into a stream N 2 , H 2 (mixture of nitrogen and hydrogen) already preheated .
  • the atmosphere is produced by injecting air in an amount such that the combination of the oxygen contained in the air with the hydrogen present in said atmosphere gives the same final composition of atmospheric gases which if a mixture of nitrogen, hydrogen and water vapor was injected directly, as described above.
  • the injected air supplies the nitrogen of the final composition of the atmosphere, and the water vapor necessary for this final atmosphere results from the combustion of part of the hydrogen of l atmosphere in the presence of oxygen from the air.
  • the degreasing atmosphere is obtained by an injection of air, as specified above, combined with an injection of fumes from the combustion of a gaseous fuel, this combustion being able to be carried out either inside or outside the enclosure where degreasing takes place.
  • the combustion of the gaseous fuel is preferably a sub-stoichiometric combustion, in premix or not, with a rate of unburnt of between 0.5 and 10%.
  • This variant provides a simplification of implementation compared to the process described above, while allowing the same oxidation potential with respect to the strip, since the final composition of the degreasing atmosphere remains the even.
  • an N 2 + H 2 mixture flow rate of 150 Nm 3 / h is injected in the vicinity of the metallization bath. This flow passes through the cooling and annealing sections, and reaches the degreasing section.
  • the atmosphere is produced by injecting oxidizing fumes in an amount such that the excess oxygen contained in the fumes combines with the hydrogen present in the atmosphere to produce water vapor which is added to the water vapor already present in the injected fumes.
  • the degreasing atmosphere thus produced contains hydrogen, water vapor, and a small amount of C0 2 introduced with the fumes.

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  • 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)

Claims (8)

1. Entfettungsverfahren für ein kaltgewalztes Band, bei dem die Entfettung gleichzeitig mit dem Erhitzen des Bandes durchgeführt wird, mittels chemischer Einwirkung bei hoher Temperatur einer Atmosphäre geeigneter Zusammensetzung auf eine auf dem Band befindliche Ölschicht in einem mit Mitteln zum Zuführen von Hitze mittels Bestrahlung ausgestatten Raum, in dem die Erhitzungs- und Entfettungsvorgänge getrennt und unabhängig voneinander durchgeführt werden, dadurch gekennzeichnet, daß die Atmosphäre im wesentlichen aus einem in diesen Entfettungsabschnitt injizierten, mit Wasserdampf angereicherten Gemisch aus Stickstoff und Wasserstoff besteht, wobei der Wasserstoffgehalt des den Raum füllenden Gasgemisches 2 bis 30% und der Wasserdampfgehalt 5 bis 30% beträgt.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Band durch das Erhitzen mittels Bestrahlung auf eine Temperatur von 350 bis 700°C gebracht wird.
3. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß das in den Entfettungsabschnitt des Raumes injizierte Gasgemisch auf eine Temperatur in der Größenordnung von 700°C vorerhitzt wird.
4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der für die Entfettungsatmosphäre erforderliche Wasserdampf in einen Strom des bereits vorerhitzten Gasgemisches aus Stickstoff und Wasserstoff injiziert wird.
5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Entfettungsatmosphäre dadurch erhalten wird, daß Luft in einer solchen Menge injiziert wird, daß die Kombination aus dem in der Luft enthaltenen Sauerstoff mit dem in der Atmosphäre vorhandenen Wasserstoff dieselbe Endzusammensetzung des Gases der Atmosphäre ergibt, wie wenn ein Gemisch aus Stickstoff, Wasserstoff und Wasserdampf direkt injiziert würde.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß man in die Entfettungsatmosphäre außerdem Rauchgase injiziert, die von einer entweder im Inneren des Entfettungsraumes oder außerhalb davon durchgeführten Verbrennung eines gasförmigen Brennstoffs stammen.
7. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß man eine unter-stöchiometrische Verbrennung, vorgemischt oder nicht, mit einem Gehalt an Unverbranntem von 0,5 bis 10% durchführt.
8. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Entfettungsatmosphäre dadurch erhalten wird, daß oxydierende Rauchgase in einer solchen Menge injiziert werden, daß sich der in den Rauchgasen vorhandene überschüssige Sauerstoff mit dem in dieser Atmosphäre vorhandenen Wasserstoff vereinigt, unter Bildung von Wasserdampf, der dem bereits in diesen injizierten Rauchgasen vorhandenen Wasserdampf hinzugefügt wird, so daß die so hergestellte Entfettungsatmosphäre Wasserstoff, Wasserdampf, Stickstoff und eine zusammen mit den Rauchgasen zugeführte, geringe Menge an CO2 enthält.
EP85400669A 1984-04-05 1985-04-03 Entfettungsverfahren für kaltgewalztes Stahlband Expired - Lifetime EP0157708B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85400669T ATE57396T1 (de) 1984-04-05 1985-04-03 Entfettungsverfahren fuer kaltgewalztes stahlband.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8405366A FR2562563B1 (fr) 1984-04-05 1984-04-05 Procede de degraissage d'une bande metallique laminee a froid
FR8414950 1984-09-28
FR8414950A FR2571064B2 (fr) 1984-09-28 1984-09-28 Procede de degraissage d'une bande metallique laminee a froid
FR8405366 1985-04-05

Publications (3)

Publication Number Publication Date
EP0157708A2 EP0157708A2 (de) 1985-10-09
EP0157708A3 EP0157708A3 (en) 1987-05-20
EP0157708B1 true EP0157708B1 (de) 1990-10-10

Family

ID=26223904

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85400669A Expired - Lifetime EP0157708B1 (de) 1984-04-05 1985-04-03 Entfettungsverfahren für kaltgewalztes Stahlband

Country Status (3)

Country Link
US (1) US4840680A (de)
EP (1) EP0157708B1 (de)
DE (1) DE3580055D1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3639657A1 (de) * 1986-11-20 1988-06-01 Philips Patentverwaltung Verfahren zum reinigen von metallbauteilen fuer kathodenstrahlroehren
CA1314451C (en) * 1987-06-05 1993-03-16 James E. Heath Cleaning unit
GB8827933D0 (en) * 1988-11-30 1989-01-05 Plessey Co Plc Improvements relating to soldering processes
EP0506175B1 (de) * 1991-03-26 1996-12-04 Koninklijke Philips Electronics N.V. Flüssigkristallbildwiedergabeanordnung mit Orientierungsschicht
GB2274286B (en) * 1993-01-13 1996-11-06 Singapore Asahi Chemical & Solder Ind Pte Ltd Method of and apparatus for preparing an electric circuit board for a flow or wave soldering process
US5578147A (en) * 1995-05-12 1996-11-26 The Boc Group, Inc. Controlled process for the heat treating of delubed material
DE19840778A1 (de) * 1998-09-07 2000-03-09 Messer Griesheim Gmbh Verfahren und Vorrichtung zur Reinigung von Metalloberflächen
JP6367402B1 (ja) * 2017-02-28 2018-08-01 モリテックスチール株式会社 過熱水蒸気による油分除去システム及び過熱水蒸気発生装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2189836A (en) * 1936-08-12 1940-02-13 Crown Cork & Seal Co Method of strip annealing aluminum foil
US2506364A (en) * 1948-03-03 1950-05-02 Gen Electric Heat-treating aluminum foil
US2625495A (en) * 1948-06-04 1953-01-13 Surface Combustion Corp High-temperature cleaning of ferrous metal
US3061485A (en) * 1960-12-12 1962-10-30 Reynolds Metals Co Residual lubricant removal from aluminum foil
FR1568732A (de) * 1966-05-16 1969-05-30
US3627289A (en) * 1970-06-22 1971-12-14 Walter Erman Apparatus and method for removing oil from metal turnings
JPS51112413A (en) * 1975-03-29 1976-10-04 Sumitomo Metal Ind Ltd Method of continuous annealing steel strip
FR2415147A1 (fr) * 1978-01-19 1979-08-17 Valjim Corp Traitement electrothermique a courant continu de toles continues en atmosphere protectrice
CA1152870A (en) * 1979-12-24 1983-08-30 Hiromitsu Naito Process for continuously annealing of a cold rolled steel strip
FR2508064B1 (fr) * 1981-06-23 1987-07-10 Stein Heurtey Procede de degraissage d'une bande laminee a froid
FR2562562B1 (fr) * 1984-04-04 1986-08-08 Stein Heurtey Procede et dispositif de nettoyage en continu d'une bande metallique

Also Published As

Publication number Publication date
EP0157708A2 (de) 1985-10-09
US4840680A (en) 1989-06-20
DE3580055D1 (de) 1990-11-15
EP0157708A3 (en) 1987-05-20

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