EP2188399B2 - Gesteuertes verfahren und vorrichtung zur oxidation/oberflächenreduktion eines kontinuierlich durch einen strahlungsrohr-galvanisierungsofen laufenden stahlstreifens - Google Patents

Gesteuertes verfahren und vorrichtung zur oxidation/oberflächenreduktion eines kontinuierlich durch einen strahlungsrohr-galvanisierungsofen laufenden stahlstreifens Download PDF

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Publication number
EP2188399B2
EP2188399B2 EP08829848.4A EP08829848A EP2188399B2 EP 2188399 B2 EP2188399 B2 EP 2188399B2 EP 08829848 A EP08829848 A EP 08829848A EP 2188399 B2 EP2188399 B2 EP 2188399B2
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Prior art keywords
oxidation
strip
medium
oxidizing medium
furnace
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EP08829848.4A
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English (en)
French (fr)
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EP2188399B1 (de
EP2188399A1 (de
Inventor
Pierre-Jérôme BORREL
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Primetals Technologies USA LLC
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Primetals Technologies USA LLC
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
    • F27B9/068—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated heated by radiant tubes, the tube being heated by a hot medium, e.g. hot gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/28—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity for treating continuous lengths of work

Definitions

  • the invention relates to the continuous galvanizing of steel strips, in particular AHSS, with high silicon, manganese and aluminum contents and, in particular, to installations comprising a radiant tube furnace without a direct flame heating zone.
  • the patent JP 02-285057 describes an oxidation phase between 400 and 700°C in a slightly oxidizing atmosphere then a reduction phase between 600 and 800°C in a reducing atmosphere, it indicates temperature ranges and the composition of the gases (contents of O2, N2 and H2 ).
  • the patent EP 1 285 972 describes the same principle. These two patents, however, remain very general and do not clearly reveal the practical means of controlling the reactions.
  • the patent EP 1 457 580 describes an installation making it possible to carry out the oxidation phase in a specific enclosure where the strip is heated by induction or combustion of a gas, in an oxidizing atmosphere, between 100 and 400°C.
  • the patent US 3,936,543 describes an annealing furnace operation aimed not at the specific coating of AHSS steels but making it possible to avoid the use of cleaning fluxes during galvanizing thanks to the oxidation then the surface reduction of carbon steel strips.
  • the annealing furnace preceding the galvanizing bath is a conventional furnace comprising a direct flame heating zone (DFF) and a radiant tube temperature holding zone (RTF).
  • DFF direct flame heating zone
  • RTF radiant tube temperature holding zone
  • the reduction is obtained in the RTF zone which comprises at least 5% hydrogen, the remainder being nitrogen.
  • the patent WO 2005/017214 offers two options for solving the problem. The first consists in using a direct flame combustion chamber separated from the RTF annealing furnace and from which the burnt gases are collected in order to inject them into the furnace. The second is to install a direct flame burner in an area of the oven enclosure. In both cases, the burnt gases provide the necessary oxidizing atmosphere under composition conditions that obviously depend on the temperature of the strip and that of the gases. The reduction is then conventionally obtained by passage through a mixture of nitrogen and hydrogen.
  • the invention consists in injecting an oxidizing medium into a section of a furnace with radiant tubes, in particular with a nitrogen/hydrogen atmosphere, using one or more tubes, in particular specially modified and capable of being installed in place and place of any of the existing tubes.
  • this injection can be carried out in any section of the furnace, preferably in the preheating section.
  • the medium must present, depending on the temperature of the strip and the chemical composition of the latter, a dew point such that the alloying elements such as silicon, manganese, aluminum, chromium are oxidized in depth and no longer have the possibility of migrating to the surface.
  • this dew point is above -20°C.
  • the injected medium can be water vapor or air or a mixture rich in oxygen. It can also be the product resulting from the combustion of an over-stoichiometric air or super-oxygenated air or oxygen/fuel mixture in a burner.
  • Control of this selective oxidation preferably involves measuring the dew point in the zone(s) in which the modified tube(s) are installed. This measurement can be carried out by dew point transmitters installed in a fixed position and operating in a closed loop with the members for adjusting the flow rate of the oxidizing medium injected by the oxidizing medium injectors and/or adjusting the burners.
  • the invention also presents an associated device for its implementation of said method and ensuring the organization, in a preheating section and/or a holding section of a continuous galvanizing annealing furnace for steel strips equipped only radiant tubes, with at least one oxidation zone aimed at preventing the selective oxidation of steel alloy elements, by injecting an oxidizing medium into the oxidation zone, characterized in that it comprises at least one tube comprising at least one branch provided with calibrated holes allowing the oxidizing medium to pass into the oxidation zone.
  • the means for introducing the oxidizing medium can be either an injector supplying the tube with a hot oxidizing medium such as steam, air or an oxygen-rich gas, or a burner supplying the tube into a product resulting from the combustion of an over-stoichimetric air/fuel mixture, a stoichiometric super-oxygenated air/fuel mixture or a stoichiometric air/oxygenated fuel mixture within the non-explosive limit.
  • a hot oxidizing medium such as steam, air or an oxygen-rich gas
  • the modified tube(s) intended to supply the oxidizing medium necessary for the oxidation of the strip is (are), for example, a U-shaped tube, one inlet branch of which is equipped at its end with a device for injecting water vapor or air, preheated or not, super-oxygenated or not, or oxygen and whose branch opposite the inlet branch is closed at its end, at least one of the branches preferably the branch opposite to the input branch, is pierced with calibrated holes allowing said medium to pass.
  • the U-tube can be replaced by any conventional tube shape such as, for example, a P-shape, double-P shape, W-shape or thimble shape.
  • the radiant tube intended to supply the oxidizing medium is a P-shaped tube having an inlet branch equipped at its end with a burner and of which at least one of the branches, preferably the opposite branch at the inlet branch, is pierced with calibrated holes allowing the burnt gases to pass into the enclosure of the furnace.
  • the branch opposite the inlet branch comprising the burner can allow part of the burnt gases to evacuate outside the furnace through a calibrated orifice or comprise a heat exchanger device making it possible to preheat the combustion air with the burnt gases.
  • the P-tube can be replaced by any conventional tube shape such as, for example, a U-shape, W-shape, double-P shape or glove finger shape.
  • the burner(s) are supplied with an over-stoichiometric air/fuel mixture or a stoichiometric super-oxygenated air/fuel mixture or a stoichiometric air/oxygenated fuel mixture within the non-explosive limits.
  • Tubes equipped with burner or injector, whatever their type, are directly interchangeable with existing ones. They can be installed on demand depending on the temperature chosen for oxidation or be permanently installed at different points in the furnace. In this case, they are activated according to the choice of the temperature at which it is desired to oxidize the strip, therefore the position of the tube in the oven.
  • Another advantage of the process is to locate the injection of oxidizing medium exactly where it is needed, that is to say very close to the two sides of the steel strip and to be able to take advantage of the local effect of turbulence in contact with the band which favors the reactions between the medium and the band.
  • the heating in particular in the preheating 61 and holding 62 sections of the oven 6 is obtained by means of radiant tubes.
  • a radiant tube 2, in P is installed in the enclosure 1 of a galvanizing annealing furnace, for example a preheating or holding section. It is assembled by a support 5 and a plate 4.
  • a burner 3 supplied with fuel and combustion air is arranged at the end of the inlet branch 2a of the tube 2 and delivers high temperature burnt gases into the tube. .
  • burnt gases are essentially diffused in the enclosure 1 using calibrated holes 6 made in the branch 2b of the tube, opposite the inlet branch 2a. This branch 2b is closed off at its end so that some of the burnt gases recirculate in the tube.
  • the branch 2b of the tube 2 in P opposite the burner 3 is equipped with a calibrated or adjustable device 7 making it possible to evacuate part of the burnt gases to the outside of the furnace.
  • the branch 2b of the P-tube opposite the burner 3 is equipped with a heating device 8, 9 of the combustion air by the burnt gases.
  • the radiant tube can be of the double P type as shown in figure 6 .
  • the burner 3 is arranged in the open end of the central inlet branch 2a of the tube 2.
  • the holes 6 are then preferably made in each of the opposite branches 2b located on either side of the central branch 2a.
  • a U-tube 2 is installed in the enclosure 1 of a galvanizing annealing furnace. It is assembled by a support 5 and a plate 4.
  • An injector 10 supplied with oxidizing gas under pressure such as steam, air or a mixture rich in oxygen delivers into the tube 2 a mixture of oxidizing gases and high temperature HNx mixture present in the furnace enclosure. This mixture is diffused in the enclosure 1 using calibrated holes 6 provided in the branch 2b opposite the inlet branch 2a. The end of branch 2b opposite to inlet branch 2a comprising the injector is closed off by a plug 11.
  • the radiant tube 2 can be of the double P type similar to that described in figure 6 , the burner being replaced by an injector 10.
  • the injectors are static devices requiring no other energy than that of the fluid which are moreover always available in metallurgical sites, water vapor under pressures of 8 to 10 bars.
  • the expansion energy in the enclosure of the oven leads to a stirring and circulation effect which avoids the use of fans. The energy cost of the process is therefore very limited.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (4)

  1. Verfahren, welches in einem Glühofen zur kontinuierlichen Verzinkung von Stahlbändern, der eine Vorwärmzone und eine Haltezone umfasst und mit Strahlrohren ohne Zone mit direkter Flamme ausgestattet ist, die Oxidation des Bandes gewährleistet, mit dem Ziel, die selektive Oxidation der Legierungselemente des Stahls zu verhindern, dadurch gekennzeichnet, dass es die folgenden Schritte umfasst:
    Montage, an mindestens einer Stelle der Vorwärmzone des Ofens und/oder an mindestens einer Stelle der Haltezone des Ofens,
    mindestens eines modifizierten Rohres, das in der Lage ist,
    ein oxidierendes Medium einzuspritzen; und
    Einspritzung des oxidierenden Mediums über das (oder die) modifizierte(n) Rohr(e); dadurch, dass es mindestens ein Rohr umfasst, das mindestens einen Schenkel aufweist, der mit kalibrierten Löchern versehen ist, die das oxidierende Medium in die Oxidationszone durchströmen lassen, und das mindestens ein existierendes Heizstrahlrohr ersetzt;
    wobei das oxidierende Medium eine solche Zusammensetzung aufweist, dass es, unter den Temperaturbedingungen des oxidierenden Mediums und des Stahlbandes und in Abhängigkeit von der chemischen Zusammensetzung des Bandes, einen Taupunkt besitzt, der die Tiefenoxidation der Legierungselemente, wie Silizium, Mangan, Aluminium, Chrom, des Stahlbandes gewährleistet; dadurch, dass die Zusammensetzung des Mediums so beschaffen ist, dass, unter den Temperaturbedingungen des Mediums und des Bandes und in Abhängigkeit von der chemischen Zusammensetzung des Bandes, der Taupunkt des Mediums höher als -20 °C ist.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das oxidierende Medium Wasserdampf, Luft oder ein an Sauerstoff reiches Gas ist, das mittels eines Injektors eingespritzt wird.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das eingespritzte Medium aus der Verbrennung, mittels eines Brenners, eines überstöchiometrischen Luft-Brennstoff-Gemisches, eines stöchiometrischen Gemisches von mit Sauerstoff angereicherter Luft und Brennstoff oder eines stöchiometrischen Gemisches von Luft und mit Sauerstoff angereichertem Brennstoff innerhalb der Grenzen der Nichtexplosivität resultiert.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass es einen Schritt der Messung des Taupunktes des oxidierenden Mediums in den Zonen des Ofens, wo die modifizierten Rohre eingebaut sind, und einen Schritt der Regelung der Durchflussmenge des oxidierenden Mediums in diesen Rohren im geschlossenen Regelkreis mit der Taupunktmessung umfasst.
EP08829848.4A 2007-09-03 2008-07-04 Gesteuertes verfahren und vorrichtung zur oxidation/oberflächenreduktion eines kontinuierlich durch einen strahlungsrohr-galvanisierungsofen laufenden stahlstreifens Active EP2188399B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0757331A FR2920439B1 (fr) 2007-09-03 2007-09-03 Procede et dispositif d'oxydation/reduction controlee de la surface d'une bande d'acier en defilement continu dans un four a tubes radiants en vue de sa galvanisation
PCT/FR2008/000981 WO2009030823A1 (fr) 2007-09-03 2008-07-04 Procede et dispositif d'oxydation/reduction controlee de la surface d'une bande d'acier en defilement continu dans un four a tubes radiants en vue de sa galvanisation

Publications (3)

Publication Number Publication Date
EP2188399A1 EP2188399A1 (de) 2010-05-26
EP2188399B1 EP2188399B1 (de) 2013-08-28
EP2188399B2 true EP2188399B2 (de) 2023-05-03

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EP08829848.4A Active EP2188399B2 (de) 2007-09-03 2008-07-04 Gesteuertes verfahren und vorrichtung zur oxidation/oberflächenreduktion eines kontinuierlich durch einen strahlungsrohr-galvanisierungsofen laufenden stahlstreifens

Country Status (6)

Country Link
US (1) US8609192B2 (de)
EP (1) EP2188399B2 (de)
JP (1) JP2010538163A (de)
CN (1) CN101796203B (de)
FR (1) FR2920439B1 (de)
WO (1) WO2009030823A1 (de)

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BR112012014451B1 (pt) * 2009-12-15 2018-04-24 Primetals Technologies France SAS Instalação e processo de pré-aquecimento de uma tira de aço em movimento contínuo
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DE102011056823A1 (de) 2011-12-21 2013-06-27 Thyssen Krupp Steel Europe AG Düseneinrichtung für einen Ofen zum Wärmebehandeln eines Stahlflachprodukts und mit einer solchen Düseneinrichtung ausgestatteter Ofen
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EP2687611A1 (de) * 2012-07-17 2014-01-22 Linde Aktiengesellschaft Verfahren und Vorrichtung zur Steuerung der Oberflächenporosität von Metallmaterialien
DE102013105378B3 (de) * 2013-05-24 2014-08-28 Thyssenkrupp Steel Europe Ag Verfahren zur Herstellung eines durch Schmelztauchbeschichten mit einer metallischen Schutzschicht versehenen Stahlflachprodukts und Durchlaufofen für eine Schmelztauchbeschichtungsanlage
EP2821520B1 (de) 2013-07-03 2020-11-11 ThyssenKrupp Steel Europe AG Verfahren zum beschichten von stahlflachprodukten mit einer metallischen schutzschicht
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US11193196B2 (en) 2015-05-07 2021-12-07 Cockerill Maintenance & Ingénierie S.A. Method and device for reaction control
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CN106282903B (zh) * 2016-09-12 2018-11-30 西北师范大学 火焰法制备块状纳米氧化铁涂层的工艺
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CN107354424B (zh) * 2017-08-08 2019-10-11 常州大学 一种抑制高强钢钢板表面选择性氧化的蒸镀锌预处理工艺
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FR2920439A1 (fr) 2009-03-06
WO2009030823A1 (fr) 2009-03-12
EP2188399B1 (de) 2013-08-28
US20100173072A1 (en) 2010-07-08
EP2188399A1 (de) 2010-05-26
CN101796203A (zh) 2010-08-04
CN101796203B (zh) 2011-12-14
US8609192B2 (en) 2013-12-17
FR2920439B1 (fr) 2009-11-13
JP2010538163A (ja) 2010-12-09

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