EP0686209B1 - Verfahren und vorrichtung zur kontinuierlichen behandlung eines verzinkten stahlbandes - Google Patents

Verfahren und vorrichtung zur kontinuierlichen behandlung eines verzinkten stahlbandes Download PDF

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Publication number
EP0686209B1
EP0686209B1 EP95902008A EP95902008A EP0686209B1 EP 0686209 B1 EP0686209 B1 EP 0686209B1 EP 95902008 A EP95902008 A EP 95902008A EP 95902008 A EP95902008 A EP 95902008A EP 0686209 B1 EP0686209 B1 EP 0686209B1
Authority
EP
European Patent Office
Prior art keywords
strip
temperature
rapidly
heating
cooling
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
EP95902008A
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English (en)
French (fr)
Other versions
EP0686209A1 (de
Inventor
Stéphan Wilmotte
Michel Dubois
Erik Van Perlstein
Simon Vandenbruaene
Michel Beguin
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.)
Sidmar SA
Centre de Recherches Metallurgiques CRM ASBL
ArcelorMittal Liege Upstream SA
Tata Steel Ijmuiden BV
Original Assignee
Sidmar SA
Cockerill Sambre SA
Centre de Recherches Metallurgiques CRM ASBL
Hoogovens Staal BV
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Publication date
Application filed by Sidmar SA, Cockerill Sambre SA, Centre de Recherches Metallurgiques CRM ASBL, Hoogovens Staal BV filed Critical Sidmar SA
Publication of EP0686209A1 publication Critical patent/EP0686209A1/de
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Publication of EP0686209B1 publication Critical patent/EP0686209B1/de
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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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C23C2/29—Cooling or quenching

Definitions

  • the present invention relates to a method for the continuous treatment of a galvanized steel strip, in particular by galvannealing. She wears also on an installation.
  • the galvannealing operation is performed in an instalation where the strip describes at least two vertical passes, namely a ascending pass and descending pass.
  • this installation can also be used to manufacture a galvanized strip conventional.
  • a heating and maintaining temperature above the galvanizing bath immediately after the wringing device consisting of air knives.
  • This oven is generally retractable, because it is not not used in the production of conventional galvanized strips.
  • a first cooling device usually a group of supply air fans, so that do not damage the coating on the deflection rollers. All of the oven and the cooling device determine the height of the ascending pass, which generally does not exceed 50 meters due to the vibrations produced in the air knives.
  • a second device cooling system for example a second group of fans, is usually placed at the start of the following downward pass.
  • the coated strip leaves the zinc bath at a temperature of about 450 ° C to 480 ° C then, after spinning with the knives of air, it undergoes the galvannealing operation by heating and keeping in the above-mentioned oven at a temperature between 460 ° C. and 600 ° C depending on the steel grade considered. It is then cooled first by a first group of fans at the end of the pass rising, then at the start of the falling pass, to a temperature suitable for further processing of the coated strip.
  • said means for heating the strip include a direct fire oven or an induction oven.
  • These means of heaters are capable of increasing from 50 ° C to 100 ° C the temperature of the strip, with a speed which is however moderate and for example, for a strip 0.7 mm thick, 6 ° C / s in a oven equipped with burners and 30 ° C / s in a frequency induction oven 10 kHz.
  • heating by gas burners has a yield low energy, around 30%, while with conventional induction with multispire coils, with longitudinal flow or transverse, we may have to correct the transverse distribution irregular temperatures.
  • the means for maintaining the temperature are generally consisting of an insulated tunnel, possibly equipped with means of heating, for example with electricity or gas; they occupy approximately a quarter of the height of the ascending vertical strand. All ovens heating and holding should be long enough to ensure residence time greater than 10 seconds, and preferably greater at 15 seconds, at a temperature above 450 ° C.
  • the present invention aims to remedy this situation by offering a thermal cycle which ensures excellent conditions of execution of the galvannealing treatment: instead of the cycles that one currently practiced, the method of the invention performs a "square" cycle with a long holding time at a temperature which can be relatively low given the long duration of treatment.
  • the process of continuous treatment of a steel strip galvanized with hardened, object of the present invention is characterized in that, after the strip wringing operation at the outlet of the zinc bath, we quickly warms up the strip to a temperature between 460 ° C and 600 ° C with a heating power density greater than 180 kW / m2 per side of product, keeping the strip at substantially constant temperature for a period between 10 seconds and 30 seconds, in that we then quickly cool the tape up to a temperature below 420 ° C with a density of cooling power greater than 100 kW / m2 per product side.
  • the temperature at which the strip is worn depends on the shade of treated steel, like what happens in the galvannealing operation traditional; in practice, however, it can be a little lower and be for example between 460 and 560 ° C.
  • the heating power density - respectively cooling - which is expressed in kW / m2 is a concept well known to practitioners, and in particular practitioners of heat treatment of steel sheets. We can easily convert power density to rate of change temperature, depending on the thickness of the product.
  • a heating power density of 180 kW / m2 per side of product means a heating rate of 100 ° C / s for a sheet of 0.7 mm thick, and 60 ° C / s for a sheet 1.25 mm thick.
  • a cooling power density of 100 kW / m2 per product side means a cooling rate of 54 ° C / s for a thickness of 0.7 mm and 30 ° C / s for a sheet of 1.25 mm.
  • the rapid heating of the strip by means of a very high induction furnace frequency, for example between 100 kHz and 500 kHz; this modality achieves very high power densities and therefore to achieve very high heating rates, for example already 150 ° C / s for a 0.7 mm thick strip in an oven at 100 kHz.
  • the temperature holding zone is constituted by an enclosure possibly provided with means of reheating such as gas burners to provide calories intended to compensate for local heat losses.
  • the strip on leaving the temperature-maintaining zone, the strip is cooled to a temperature below 350 ° C.
  • the operating parameters of the cooling system are adjusted to ensure a cooling density greater than 125 kW / m 2 per product face.
  • the cooling is provided rapid strip by means of water / air mist nozzles.
  • the rise in temperature by heating to induction allows, as we already know, better control of the operation of galvannealing treatment, provided that the distribution of temperatures in the strip be as homogeneous as possible at the outlet of the oven, which depends on the conditions after leaving the zinc bath.
  • a homogenization section of temperatures for example equipped with burners arranged across the band and provided with individual means for adjusting the feed.
  • FIG. 1 shows an installation of treatment of a galvanized steel strip, typical of the technique current.
  • the strip 1 is deflected by a first deflection roller 4, and it leaves the zinc bath 2 in vertical direction, guided by rollers 5.
  • the steel strip 1 successively describes a trajectory upward vertical to a second deflection roller 7, a trajectory horizontal to a third deflection roller 8, then a trajectory downward vertical towards a later operation.
  • an oven is placed comprising a heating section composed of zones 9 and 10 followed a temperature maintenance section 11.
  • This oven makes it possible to operate the heating the strip and keeping it at the temperature chosen for cause the migration of iron into zinc which characterizes the treatment of galvannealing. All or part of this oven is retractable in order to ability to produce conventionally galvanized steel strips, without galvannealing treatment; in particular, this oven can make room for other equipment, such as for example a minimum flowering, often used in conventional galvanization.
  • the strip temperature is around 450 ° C after spinning; by the galvannealing operation in the oven, it is raised up to 460 ° C at 600 ° C depending on the grade of steel treated.
  • the conventional installation includes a device 12 for cooling the galvanized steel strip, which usually consists of a group of supply air fans. These devices ensure the cooling of the galvanized strip, possibly after galvannealing, to a sufficiently low temperature to prevent it from sticking to the idler rollers 7.
  • This modality does not differ from the prior art as far as the actual galvanization of the strip, as well as the spin of the zinc layer.
  • the essential difference relates to the galvannealing oven which, according to the invention has a short heating section 10 rapid galvanized steel strip, followed by a short zone 13 temperature equalization and a long holding zone 11 at substantially constant temperature; at the outlet of the oven is arranged a rapid cooling section 14 fitted with mist nozzles water / air.
  • the length of the vertical path upward (4.7) cannot currently exceed fifty meters, in particular due to transverse vibrations of the strip and difficulty adjusting the thickness of the coating.
  • the facilities conventional as shown in Figure 1 given the presence of a long cooling device 12 before the first idler roller 7 and the length of the heating oven 10 space available for temperature maintenance zone 11 is limited.
  • the invention makes it possible to greatly lengthen the duration of temperature maintenance, which on the one hand facilitates adjustment temperatures and the conduct of treatment and secondly allows to apply a long hold at a lower temperature than in the conventional operation, which is favorable for the properties of the coating.
  • section AB represents the slight cooling which affects the strip at the outlet of the zinc bath at A and the section EF illustrates the temperature decrease following forced cooling before contact with deflection roller 7.
  • the strip cools slightly, passing from 460 ° C to 445 ° C at its entry into an induction furnace whose heating density is 190 kW / m 2 and which raises the temperature to 490 ° C; the strip is maintained at this temperature for 15.5 seconds, after which it is subjected to intense cooling in an enclosure 3 m in length, the first part of which is equipped with a battery of water / air jets, the cooling power of which is 180 kW / m 2 per product face; the temperature of the strip leaving the enclosure is 330 ° C.

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Coating Apparatus (AREA)

Claims (8)

  1. Verfahren zur kontinuierlichen Behandlung von feuerverzinktem Stahlband, dadurch gekennzeichnet, daß man das Band nach der Abstreifstufe am Austritt aus dem Zinkbad rasch mit einer Heizleistungsdichte von mehr als 180 kW/m2 Produktfläche wieder bis auf eine Temperatur zwischen 460°C und 600°C erhitzt, daß man das Band für einen Zeitraum zwischen 10 Sekunden und 30 Sekunden auf einer im wesentlichen konstanten Temperatur hält und daß man dann das Band rasch mit einer Kühlleistungsdichte von mehr als 100 kW/m2 Produktfläche auf eine Temperatur unter 420°C abkühlt.
  2. Behandlungsverfahren nach Anspruch 1, dadurch gekennzeichnet, daß man das rasche Erhitzen des Bandes mittels eines Induktionsofens mit einer Frequenz zwischen 100 kHz und 500 kHz bewirkt.
  3. Behandlungsverfahren nach Anspruch 2, dadurch gekennzeichnet, daß man das Erhitzen durch kombinierte Anwendung des Induktionsofens und einer beispielsweise aus Kupferfolie bestehenden, das Band umhüllenden Induktionsspule mit einer einzigen Windung bewirkt.
  4. Behandlungsverfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß man die Aufrechterhaltung der Temperatur in einer gegebenenfalls mit Wiedererhitzungsmitteln wie Gasbrennern versehenen Umgebung bewirkt.
  5. Behandlungsverfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß man das Band rasch bis auf eine Temperatur unter 350°C abkühlt.
  6. Behandlungsverfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß man das Band rasch mit einer Kühlleistungsdichte von mehr als 125 kW/m2 Produktfläche abkühlt.
  7. Behandlungsverfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß man die rasche Abkühlung des Bandes mittels einen Wasser/Luftnebel versprühender Düsen bewirkt.
  8. Vorrichtung zur kontinuierlichen Behandlung von verzinktem Stahlband mit einem ein Zinkbad enthaltenden Behälter, mit einen vertikal ansteigenden Weg für das Band definierenden Umlenkwalzen sowie mit nach dem Austritt des Bandes aus besagtem Behälter auf besagtem vertikal ansteigendem Weg angeordneten Abstreifern, dadurch gekennzeichnet, daß sie nacheinander Mittel zur raschen Erhitzung des Bandes, die aus einem Induktionsofen mit einer Frequenz zwischen 100 kHz und 500 kHz bestehen, Mittel zum Halten des Bandes auf einer im wesentlichen konstanten Temperatur und aus einen Wasser/Luftnebel versprühenden Düsen bestehende Mittel zur raschen Abkühlung umfaßt, wobei sämtliche Mittel entlang des vertikal ansteigenden Weges des Bandes angeordnet sind.
EP95902008A 1993-12-24 1994-12-13 Verfahren und vorrichtung zur kontinuierlichen behandlung eines verzinkten stahlbandes Expired - Lifetime EP0686209B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE9301453 1993-12-24
BE9301453A BE1007793A6 (fr) 1993-12-24 1993-12-24 Procede et installation de traitement continu d'une bande d'acier galvanisee.
PCT/BE1994/000094 WO1995018245A1 (fr) 1993-12-24 1994-12-13 Procede et installation de traitement continu d'une bande d'acier galvanisee

Publications (2)

Publication Number Publication Date
EP0686209A1 EP0686209A1 (de) 1995-12-13
EP0686209B1 true EP0686209B1 (de) 1998-05-27

Family

ID=3887676

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95902008A Expired - Lifetime EP0686209B1 (de) 1993-12-24 1994-12-13 Verfahren und vorrichtung zur kontinuierlichen behandlung eines verzinkten stahlbandes

Country Status (8)

Country Link
US (1) US5628842A (de)
EP (1) EP0686209B1 (de)
JP (1) JPH08511064A (de)
AT (1) ATE166672T1 (de)
BE (1) BE1007793A6 (de)
DE (1) DE69410599T2 (de)
ES (1) ES2118536T3 (de)
WO (1) WO1995018245A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3077562B1 (de) 2013-12-06 2019-03-06 Fives Celes Kontinuierliche verarbeitungslinie zur bearbeitung eines nichtmagnetischen metallbandes mit einem galvanisierungsabschnitt sowie verfahren zur induktionserwärmung dieses bandes in diesem galvanisierungsabschnitt

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2754544B1 (fr) * 1996-10-10 1998-11-06 Lorraine Laminage Tole aluminiee a faible emissivite
US6177140B1 (en) 1998-01-29 2001-01-23 Ispat Inland, Inc. Method for galvanizing and galvannealing employing a bath of zinc and aluminum
DE19822156A1 (de) * 1998-05-16 1999-11-18 Schloemann Siemag Ag Verfahren und Vorrichtung zur Durchführung der Glühung eines Galvannealing-Prozesses
US8402909B2 (en) * 2006-10-13 2013-03-26 Nippon Steel & Sumitomo Metal Corporation Production facility and production process for hot dip galvannealed steel plate
US8025835B2 (en) * 2007-07-31 2011-09-27 ArcelorMittal Investigación y Desarrollo, S.L. Furnace configured for use in both the galvannealing and galvanizing of a metal strip

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS608289B2 (ja) * 1978-10-16 1985-03-01 日新製鋼株式会社 加工性のすぐれた溶融めつき鋼板の製造方法
JPS6048570B2 (ja) * 1978-12-25 1985-10-28 日新製鋼株式会社 連続溶融アルミニウムメツキ鋼板の連続過時効処理法
JPS61223174A (ja) * 1985-03-28 1986-10-03 Sumitomo Metal Ind Ltd 合金化溶融亜鉛めつき鋼板の製造方法
JPS62130268A (ja) * 1985-12-02 1987-06-12 Kawasaki Steel Corp 加工用合金化処理溶融亜鉛めつき軟鋼板の製造方法
EP0406619A1 (de) * 1989-06-21 1991-01-09 Nippon Steel Corporation Verfahren zur Herstellung von kaltgewalzten verzinkten nichtalternden Stahlblechen mit guter Formbarkeit in einer Durchlaufverzinkungslinie
JPH0379748A (ja) * 1989-08-23 1991-04-04 Sumitomo Metal Ind Ltd 合金化処理炉
JP2658580B2 (ja) * 1990-12-29 1997-09-30 日本鋼管株式会社 プレス成形性および耐パウダリング性の優れた合金化溶融亜鉛めっき鋼板の製造方法
JP2526320B2 (ja) * 1991-05-07 1996-08-21 新日本製鐵株式会社 高張力合金化溶融亜鉛めっき鋼板の製造方法
JPH05247619A (ja) * 1992-03-03 1993-09-24 Nippon Steel Corp 合金化亜鉛めっき鋼板製造用竪型合金化炉

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3077562B1 (de) 2013-12-06 2019-03-06 Fives Celes Kontinuierliche verarbeitungslinie zur bearbeitung eines nichtmagnetischen metallbandes mit einem galvanisierungsabschnitt sowie verfahren zur induktionserwärmung dieses bandes in diesem galvanisierungsabschnitt

Also Published As

Publication number Publication date
ATE166672T1 (de) 1998-06-15
US5628842A (en) 1997-05-13
JPH08511064A (ja) 1996-11-19
ES2118536T3 (es) 1998-09-16
BE1007793A6 (fr) 1995-10-24
WO1995018245A1 (fr) 1995-07-06
EP0686209A1 (de) 1995-12-13
DE69410599T2 (de) 1999-01-21
DE69410599D1 (de) 1998-07-02

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