EP2176438B1 - Kombinierte glüh- und galvanisierungsleitung sowie verfahren zur umwandlung einer durchgehenden glühleitung in eine solche kombinierte leitung - Google Patents

Kombinierte glüh- und galvanisierungsleitung sowie verfahren zur umwandlung einer durchgehenden glühleitung in eine solche kombinierte leitung Download PDF

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Publication number
EP2176438B1
EP2176438B1 EP08831213A EP08831213A EP2176438B1 EP 2176438 B1 EP2176438 B1 EP 2176438B1 EP 08831213 A EP08831213 A EP 08831213A EP 08831213 A EP08831213 A EP 08831213A EP 2176438 B1 EP2176438 B1 EP 2176438B1
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EP
European Patent Office
Prior art keywords
section
annealing
line
galvanisation
bath
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EP08831213A
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English (en)
French (fr)
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EP2176438A1 (de
Inventor
Pierre-Jérôme BORREL
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Clecim SAS
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Siemens VAI Metals Technologies SAS
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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
    • 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
    • C21D9/562—Details
    • 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
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
    • 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
    • C23C2/003—Apparatus
    • C23C2/0035—Means for continuously moving substrate through, into or out of the 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
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C23C2/004—Snouts
    • 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
    • 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
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips

Definitions

  • the invention relates to a combined annealing and galvanizing line of a metal strip and also covers a method of converting an existing annealing line into such a combined line.
  • the cold rolling of a steel strip causes hardening, by hardening, of the metal which causes a fragility making it more difficult and may even prohibit the subsequent use of the rolled strips.
  • the entire annealing installation forms a furnace generally placed under a controlled atmosphere in a closed enclosure, and wherein the strip travels along a zig-zag path defined by a plurality of deflection rollers and which successively provides the heating of the band in section 21, its maintenance at the annealing temperature in section 22, a first cooling in section 23, fast enough to avoid oxidation, a complement of overaging treatment, in English "overaging" in the section 24, which usually comprises several successive units and a slow cooling in the section 25 which ends, usually, by quenching the strip in a final cooling liquid bath to room temperature.
  • the annealing installation 2 successively performs the metallurgical annealing and correct temperature-setting functions of the strip before it enters the metal bath 41. It therefore comprises a preheating section 21, a retention section 22 at the annealing temperature, a rapid cooling section 23 and a section 26 of galvanizing temperature in which can also be carried out an activation of the surface to be galvanized by surface chemical migrations.
  • Complete annealing lines of the type shown on the figure 1 are therefore normally provided for steel grades which justify a large tonnage and are equipped with all the equipment necessary to adapt to a new grade after modification of the adjustment parameters, in particular temperatures and the duration of the heat treatments.
  • the tonnages required in each grade are relatively small and require rapid changes in setting parameters, sometimes without stopping scrolling, the tail of a coil at the end of unwinding can be welded to the head of a next coil, of different quality and requiring other treatments.
  • the document EP-A-0254633 for example, describes such a combined line comprising successively, between a reel and a winder, a horizontal annealing furnace, a temperature control section and a conventional type of galvanizing installation. There is also a coating coating installation. According to the invention, to allow a passage from one treatment to another, without increasing the complexity and the cost of such an installation, the treated metal flow must be at most 7 tons / hour, at a speed of passage at most equal to 12 meters per minute. The production capacity of such an installation, designed some twenty years ago, would have been very limited.
  • the object of the invention is to solve such problems by means of a particular arrangement of the different equipment necessary, on the one hand for annealing and on the other hand for galvanization, making it possible to produce a combined line capable of performing either annealing alone, or an annealing followed by galvanization, without unduly increasing the congestion in length of the line.
  • this particular arrangement of the equipment makes it possible, according to the invention, to quite simply convert an existing continuous annealing installation to add galvanizing means without excessive modification of the existing installation and remaining in the floor area of the floor. it.
  • the invention makes it possible to continue a profitable exploitation of certain existing continuous annealing installations that are no longer adapted to the requirements of the market, by transforming them into a combined line capable of handling a very wide variety of products.
  • the invention therefore relates to a combined annealing and galvanizing line of a metal strip comprising means for controlling the movement of the strip in a continuous line, between an input device and an output device of the line, successively in a annealing apparatus and a galvanizing plant, the annealing apparatus having a section for heating and holding the band at an annealing temperature, a first annealing section after annealing, an overaging section and a second cooling section up to ambient temperature, and the galvanizing plant having an inlet section of the strip in a galvanizing metal bath, an outlet section of the metal bath of the strip covered on both sides with a layer coating, a cooling section of the coating and a final coolant bath.
  • the galvanizing plant is incorporated inside the annealing plant, between the overaging section and the second cooling section, and at the outlet of the overaging section, the band is directed by selective guiding means, either to the galvanizing plant and then, at the outlet of the final cooling bath, directly to the output device of the line, or directly to the second cooling section and then to the output device of the line.
  • the overfill section and the second cooling section of the annealing plant are each placed in a sealed enclosure filled with a protective gas and the inlet section in the galvanizing metal bath is placed in a sealed duct having an inlet connected to the outlet of the overflow section and two outlets, respectively a first outlet immersed in the metal bath and a second outlet on which is releasably connected a leaktight trough with the second section cooling and annealing installation, said second outlet being provided with removable sealing means.
  • the combined line according to the invention comprises a plurality of deflection rollers defining two paths of the strip at the exit of the overaging section, respectively a first galvanization path comprising an inlet section in the metal bath. passing through the first outlet of the sealed conduit, an outlet section of the metal bath, a cooling section of the coating prior to entry into the final cooling bath, and an exit section of said cooling bath passing above or below the enclosure in which is placed the second cooling section, so as to connect directly to the output device of the line, and a second annealing path alone, passing through the removable connection channel between the second outlet of the sealed conduit and the enclosure of the second cooling section.
  • the combined line comprises two liquid final cooling baths of the strip, respectively a first bath placed at the outlet of the galvanizing installation, and a second bath placed at the outlet of the second cooling section, the strip being directed towards the outlet device of the line after final cooling carried out, either in the first bath after galvanization, or in the second bath after an annealing treatment alone, without galvanizing.
  • the first cooling bath is placed above the metal bath and offset to the inlet side thereof to reduce the bulk of the galvanizing plant.
  • the over-age section has a reduced length compared to the length usually required in a continuous annealing line. and the running speed of the web is adapted to this reduced length in order to obtain the necessary processing time.
  • the invention also covers a process for converting into a combined annealing and galvanizing line, an existing continuous annealing line of a metal strip comprising successively, in a running direction of the product, an input device in the line, a preheating section, an annealing section, a first rapid cooling section after annealing, a supercooling section, a slow cooling section under a protective atmosphere and a line output device.
  • part of the overaging section is removed leaving the other sections in place and a galvanizing installation is placed inside the annealing line, in the space thus released between the remaining part of the overfill section and the second slow cooling section, and connected to the scroll control means so as to achieve a combined annealing and galvanizing line without increasing the overall length of the annealing line.
  • the running speed of the web between the input device and the output device of the line is adapted either to the annealing process alone or to the galvanizing process.
  • the installation of The galvanization replaces only a part of the overaging section and the running speed of the band is adjusted, if necessary, so as to carry out a survival treatment in the remaining part of the corresponding section.
  • the temperature in the annealing section is maintained at the desired level for annealing, taking into account the nature of the strip and the speed of travel and, between the exit of the overaging section and the inlet in the galvanizing bath, the installation comprises combined means of heating and cooling, for adjusting the temperature of the strip to a level suitable for the galvanizing process.
  • the galvanizing installation comprises means for controlling the running of the strip between a galvanizing metal bath and a quenching bath, along a continuous scrolling path passing over a plurality of deflection rollers. and having at least four portions, respectively a first connection portion between the quench section and the inlet to the metal bath, a second exit portion of the metal bath with coating thickness control, a third cooling portion coating before entering the quench bath and a fourth quenching bath outlet portion, connecting directly to the exit section of the annealing line, without passing through the slow cooling section.
  • the quenching bath is placed above the metal bath and shifted towards the inlet side of the the line, so that in the third cooling part, the strip returns to the rear and, in the fourth quenching bath outlet portion, passes over the metal bath and then above or below the slow cooling section to connect directly to the output device of the line.
  • the figure 1 represents, schematically, the conventional arrangement of a continuous annealing line comprising, between an input device 1 and an output device 3, an oven 2 in which the strip travels along a zig-zag path, between two series baffle rollers, respectively upper and lower, and consisting of successive sections respectively heating the band M in section 21, maintaining it at the annealing temperature in section 22, rapid cooling in section 23, a complement of so-called over-aging or "over” treatment aging "in section 24 with several successive units and slow cooling to a moderate temperature, in section 25.
  • the figure 3 is a diagram showing two examples of continuous annealing cycles shown, respectively, by curve 5 for a direct flame furnace and by the 5 'curve for heating without direct flame, for example by reverberation.
  • the heating has no particular metallurgical impact up to 600 ° C and the rate of rise in temperature (51, 51 ') can be more or less rapid depending on the heating technology used. Beyond 600 ° C and up to the maximum temperature, heating is continued at a lower speed (52, 52 ') in order to improve the control of the temperature.
  • the annealing temperature (53, 53 ') depends on the metallurgical quality targeted. It is generally between 650 and 700 ° C for tinplate and 700 to 850 ° C for a thin strip for galvanizing.
  • the holding time (53, 53 ') generally close to 15 to 30 seconds, makes it possible to stabilize the annealed structure.
  • This holding phase (53, 53 ') is followed by a controlled cooling (54, 54') at a slow speed, generally below 10 ° C./s up to a temperature of 600 to 700 ° C. to ensure the precipitation of Fe 3 C carbides.
  • a cooling is carried out to a temperature of about 350 to 450 ° C., which is rapidly conducted (55, 55 '), the cooling rate being greater than 100 ° C./s and up to 200 ° C / s to maintain carbon in solution.
  • the treatment then continues, in section 24, by maintaining the temperature for a period of one to several minutes (56, 56 '), in order to produce the precipitation of the interstitial carbon in a so-called overaging phase. .
  • the cycle ends with cooling (57, 57) to a moderate temperature, for example about 60.degree. possibly up to room temperature.
  • the figure 4 is a diagram showing a typical cycle of annealing in a galvanizing line of the type shown in FIG. figure 2 .
  • the curve 5a which shows the evolution of the temperature as a function of time is analogous to the curves 5, 5 'described previously and therefore comprises the same portions (51a, 52a) of temperature rise, (53a) of maintenance at the temperature of annealing, (54a) controlled cooling at low speed, then (55a) rapid cooling.
  • the galvanizing line of the type shown on the figure 2 also comprises a thermal control section 26 for performing, first of all over-aging (56a) and then, by cooling (57a) or possibly heating, to bring the strip to the temperature (58a) desirable for the entering the galvanizing bath.
  • the thermal cycle 5a in the galvanizing line is therefore similar to the cycle 5 in an annealing line of the type shown in FIG. figure 1 , the differences coming essentially from the speed of movement imposed by the galvanizing process which must not exceed, normally, 200 m / min in order to be able to control the thickness of the coating deposited at the exit of the metal bath whereas the usual speeds of Continuous annealing lines for thin sheets are in the range of 300 to 500 m / min.
  • the invention is based on the idea that, even for conventional and relatively complex annealing treatments, it should be possible to reduce the length of the overaging section, as compared to the usual length, and that the removal of certain chambers of overaging would provide a space in which a galvanizing plant could be incorporated, without increasing the overall size of the annealing line, to achieve a combined line to perform either an annealing treatment alone or a treatment of galvanization preceded by annealing.
  • the output of the overaging section opens into a selective guiding device 80 for directing the band M, either directly to the slow cooling section 25, for an annealing treatment alone, or to the input T1 of the In this case, at the outlet of the final cooling bath 45, the strip is directed directly towards the outlet device 3 of the line, by short-circuiting the cooling section 25.
  • the space left by the removal of a portion of the overaging section must have a relatively small length, less than the normal footprint of a conventional galvanizing plant.
  • one of the ideas of the invention consists in modifying the usual architecture of the continuous galvanizing lines by organizing in a new way the unwinding of the strip at the outlet of the zinc bath, as shown schematically on the figure 5 and more in detail on the figure 6 .
  • the strip has been brought to the desired temperature for galvanizing, as shown in the diagram of FIG. figure 4 .
  • the band leaving the section 26 passes over a deflector roll D1 which directs it to the galvanizing metal bath 41 formed in a tank and in which is immersed a deflection roll D2.
  • the band M therefore follows a downward path T1 between the output roller D1 and the immersed roll D2 on which it bears by its upper face A.
  • the strip M then comes out of the bath 41 in an upward path T2 to an upper roll D3, passing in front of a wiper device 42 of known type for controlling the thickness of the coating.
  • the band M bears on the upper roll D3 by the same side A passing on the immersed roll D2 and, therefore, instead of being directed towards the outside of the tank containing the metal bath 41, the band M returns back to the entrance side in the tray, that is to say the left side on the figures 5 and 6 .
  • the strip returns to an upper roll D'3 and descends, by a downward path T3, to a deflector roll D4 immersed in the quenching bath 45.
  • the strip then exits from this bath 45 along a rising path T4 to a pair of upper deflector rollers D5, 5 spaced apart from each other, so as to pass over the entire installation.
  • galvanizing 41 and the slow cooling section 25, then descends, by a downward path T5, to a lower roller D6 to be directed to the accumulator 31 of the output device 3.
  • the quenching bath 45 can be placed above the tank containing the galvanizing metal bath 41.
  • the footprint of the galvanizing plant 4 is reduced by compared to the classic layout of the figure 2 since it covers substantially the same length as the galvanizing bath 41.
  • this arrangement requires the construction, above the metal bath 41, of a floor to support the quench tank 45 but this increase in height of the installation does not constitute a real disadvantage, particularly for the transformation of an existing installation.
  • the return towards the rear of the strip from the upper roller D3 makes it possible to incorporate the entire galvanizing installation into the existing reduced space between the remaining part of the overaging section. and the slow cooling section 25.
  • Such an arrangement is also particularly compact since, at each change of direction, the band passes on a single roll returning, as before, to the rear.
  • This arrangement also makes it possible to distribute cooling means 44, 44 'not only along the upward path T2 but also along the downward path T3 so as to provide sufficient cooling of the coating.
  • the face A 'of the strip opposite the face A passing on the immersed roll D2 comes into contact with the lower roll D6 after the upward path T2 and the descending path T3 and, thus, not likely to be deteriorated before curing the coating.
  • Such an arrangement is particularly advantageous in applications where an outer face of the sheet, called “exposed face” must have excellent surface quality, for example for the automobile body.
  • the cooling cells and, where appropriate, the alloying furnace 43 may advantageously be staggered on the ascending strand T2 and the descending arm T3 which, in the case of the figure 6 , are separated only by a single deflection roll D3, which further reduces the footprint of the assembly.
  • the outlet section 26 of the oven 2 allows, by adjusting the speed of travel at a moderate level, for example 200 m / min, to perform a survival treatment adapted to the nature of the metal, then to ensure the implementation at the appropriate temperature of the strip before entering the zinc bath 41.
  • the figure 7 shows a complete annealing cycle for a "TRIP" type steel which requires, after annealing, isothermal retention in the bainitic transformation zone, that is to say around 290 ° C.
  • the outlet section 26 of the furnace must raise the temperature of the strip to a level compatible with the temperature of the zinc bath, for example 470 ° C.
  • the figure 8 corresponds to the case of a common steel requiring overaging, for example at 560 ° C. In this case, the temperature must be lowered to the temperature of the zinc bath.
  • the temperature control section 26 will therefore be equipped with heating means, preferably by induction and cooling, preferably by neutral gas jet.
  • the galvanizing installation 4 placed, according to the invention, between the outlet section 26 of the oven 2 and the slow cooling section 25, is provided, at its output, with a quenching bath 45 at the output of which the strip is at a temperature close to ambient. Therefore, it is not necessary to pass the strip in the slow cooling section 25, the quenching bath 45 being connected directly to the output accumulator 31.
  • a combined line has thus been realized to ensure, as the case may be, the continuous annealing line functions in the oven 2 and the final cooling section 25 and galvanizing continuous line in the furnace 2 and the galvanizing plant 4 which ends with the quench bath 45.
  • the figure 9 schematically shows the layout of an installation to easily switch from one mode of operation to another.
  • the annealing to be carried out in a controlled atmosphere the entire annealing furnace 2, with the overaging section 26, is placed in a closed enclosure 8 provided at its base with a conduit 80 which forms a branch with two outlets , respectively a first outlet 81 which plunges inside the metal bath 41 to ensure sealing, and a second outlet 82 which can be removably closed by a door 83.
  • the slow cooling section 25 also placed under a controlled atmosphere, is disposed in a sealed enclosure 8 'whose inlet 81' can be connected to the second outlet 82 of the duct 80 via a connecting chute 84 which can be moved, for example by pivoting, between the position shown on the figure 9 for which the chute 84 is tightly connected to the second outlet 82 of the duct 80 and a spaced apart position allowing the passage of the strip M along the path T2, at the outlet of the metal bath 41.
  • This mobile chute 84 thus forms a bypass tunnel allowing, when it is put in place and the door 83 open, to ensure the passage of the band M between the deflector roll D1 placed at the outlet of the oven and the section cooling 25, sealing between the two closed enclosures 8 and 8 'in which is formed a neutral atmosphere, for example a mixture of nitrogen and hydrogen.
  • the figure 10 is a schematic diagram of the operation of such a combined line.
  • the band M successively passes through the various sections of the annealing furnace 2 and, after being put into temperature in the outlet section 26, passes through the first outlet 81 of the duct 80 to open into the zinc bath 41.
  • the strip M guided by the deflecting rollers D5, D5, D7 passes below or, optionally, above the slow cooling section 25 to be directed directly to the 3 output device of the line.
  • the connecting trough 84 is put in place and the door 83 is opened. From the deflector roll D1, the band M passes into the connecting chute 84, then into the slow cooling section 25 which preferably terminates in a quenching tank 27 and is then directed by the drive rollers D8 to the output device 3 of the line.
  • the installation is equipped, on the other hand, with means not represented on the figure 9 , making it possible to cut the strip, either at a point 85, at the inlet into the connecting chute 84, or at a point 86, at the outlet of the cooling zone 25, upstream of the driving rollers D8.
  • the strip is cut at these two points 85 and 86, the mobile tunnel 84 is raised vertically and held against the front wall of the enclosure 8 'containing the cooling section 25. A band portion remains engaged in the tunnel 84 and section 25. It will serve as a "pull tape” to put the line in annealing configuration in another campaign.
  • the strip is cut at two points, respectively 87 at the exit of the zinc bath 41 and 88 after the exit of the quenching bath 45.
  • the hanging strands of the strip are attached to the frame members carrying the galvanizing plant 4 '. A portion of band remains engaged in this area and will serve as a draw tape to put the line in galvanizing configuration, in another campaign.
  • the invention thus makes it possible to carry out either an annealing alone or a galvanization after annealing in a combined line of the type shown in FIG. figure 5 , the overall overall length of which is of the same order as that of a conventional continuous annealing line, insofar as the galvanizing installation, in particular if it is carried out in the particularly compact manner described above, can incorporated within the annealing line, between the overaging section and the slow cooling section.
  • the invention will find a particularly interesting application for the transformation of existing continuous annealing lines whose profitability is no longer assured due to the variety of qualities of sheet required and the resulting tonnage decline.
  • the invention has further advantages and is not limited to the details of the embodiments which have been described as mere examples.
  • the band could pass over the cooling section 25 for descend directly into the quench bath 27 placed at the outlet thereof.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
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  • Crystallography & Structural Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (12)

  1. Kombinierte Glüh- und Galvanisierungsstrecke für ein Metallband (1) mit Mitteln zum Steuern des kontinuierlichen Ablaufens des Bandes zwischen einer Eingangsvorrichtung (1) und einer Ausgangsvorrichtung (3) der Strecke erst in eine Glühanlage (2) und dann in eine Galvanisierungsanlage (4), wobei die Glühanlage (2) einen Erwärmungsabschnitt (21), einen Abschnitt (22) zum Halten des Bandes (M) auf Glühtemperatur, einen ersten Abschnitt (23) zum schnellen Kühlen nach dem Glühen, einen Überalterungsabschnitt (24) und einen zweiten Abschnitt (25) zum langsamen Kühlen umfasst und die Galvanisierungsanlage (4) einen Eingangsabschnitt (T1) zum Einführen des Bandes in ein Galvanisierungsmetallbad (41), einen Ausgangsabschnitt (T2) zum Herausführen des auf beiden Seiten mit einer Beschichtung versehenen Bandes aus dem Metallbad, einen Abschnitt (T3) zum Kühlen der Beschichtung und ein flüssiges Bad (45) zum abschließenden Kühlen umfasst, dadurch gekennzeichnet, dass die Galvanisierungsanlage (4) zwischen dem Überalterungsabschnitt (24, 26) und dem zweiten Kühlabschnitt (25) in die Glühanlage integriert ist und dass das Band am Ausgang des Überalterungsabschnitts (24, 26) von Mitteln zum selektiven Führen (80) entweder zur Galvanisierungsanlage (4) und dann, am Ausgang des Bades zum abschließenden Kühlen (45) direkt zur Ausgangsvorrichtung (3) der Strecke oder direkt zum zweiten Kühlabschnitt (25) und zur Ausgangsvorrichtung (3) der Strecke geführt wird.
  2. Kombinierte Strecke nach Anspruch 1, dadurch gekennzeichnet, dass der Überalterungsabschnitt (26) und der zweite Kühlabschnitt (25) der Glühanlage (2) jeweils in einer dichten Kammer (8, 8') angeordnet sind, die mit einem Schutzgas gefüllt ist, und dass der Eingangsabschnitt zum Galvanisierungsmetallbad (41) in einem dichten Kanal (80) angeordnet ist, der eine Gabelung mit einem Eingang, der mit dem Ausgang der Kammer (6) des Überalterungsabschnitts (26) verbunden ist, und mit zwei Ausgängen bildet, und zwar einem ersten Ausgang (81), der in das Metallbad (41) eintaucht, und einem zweiten Ausgang (82), mit dem auf abnehmbare Weise eine Rinne (84) zur dichten Verbindung mit der Kammer (81) des zweiten Kühlabschnitts (25) der Glühanlage verbunden ist, wobei dieser zweite Ausgang (82) mit abnehmbaren Mitteln (83) zum dichten Verschließen versehen ist.
  3. Kombinierte Strecke nach Anspruch 2, dadurch gekennzeichnet, dass sie eine Vielzahl von Umlenkwalzen umfasst, die am Ausgang des Überalterungsabschnitts (16) zwei Bahnen des Bandes definieren, und zwar eine erste Galvanisierungsbahn mit einem Eingangsabschnitt (T1) zum Einführen in das Metallbad, der durch den ersten Ausgang (81) des dichten Kanals (80), durch einen Ausgangsabschnitt (T2) des Metallbads (41), durch einen Abschnitt (T3) zum Kühlen der Beschichtung vor dem Einführen in das Bad zum abschließenden Kühlen (45) und durch einen Ausgangsabschnitt (T4, T5) zum Herausführen aus dem Kühlbad (45), der oberhalb oder unterhalb der Kammer (8') liegt, in der der zweite Kühlabschnitt (25) angeordnet ist, so dass er direkt an die Ausgangsvorrichtung (3) der Strecke anschließt, verläuft, und eine zweite Bahn zum reinen Glühen, die in der abnehmbaren Verbindungsrinne (84) zwischen dem zweiten Ausgang (82) des dichten Kanals (80) und der Kammer (81) des zweiten Kühlabschnitts (25) verläuft.
  4. Kombinierte Strecke nach einem der Ansprüche 1, 2, 3, dadurch gekennzeichnet, dass sie zwei flüssige Bäder zum abschließenden Kühlen des Bandes umfasst, und zwar ein erstes Bad (45), das am Ausgang der Galvanisierungsanlage (4) angeordnet ist, und ein zweites Bad (27), das am Ausgang des zweiten Kühlabschnitts (25) angeordnet ist, wobei das Band (M) nach dem abschließenden Kühlen, das entweder nach dem Galvanisieren in dem ersten Bad (45) oder nach einer reinen Glühbehandlung ohne Galvanisierung in dem zweiten Bad (27) erfolgt, zur Ausgangsvorrichtung (3) der Strecke geführt wird.
  5. Kombinierte Strecke nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Bad zum abschließenden Kühlen (45) der Galvanisierungsanlage (4) oberhalb des Metallbades (41) und zu dessen Eingangsseite hin versetzt angeordnet ist, um den Platzbedarf der Galvanisierungsanlage (4) zu verringern.
  6. Kombinierte Strecke nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Überalterungsabschnitt (26) im Vergleich zu der in einer kontinuierlichen Glühanlage üblicherweise erforderlichen Länge eine geringere Länge aufweist und dass die Bandlaufgeschwindigkeit an diese geringere Länge angepasst ist, um die erforderliche Wärmebehandlungszeit zu erhalten.
  7. Verfahren zur Umwandlung einer kontinuierlichen Strecke zum Glühen eines Metallbandes in eine kombinierte Glüh- und Galvanisierungsstrecke, wobei die Glühstrecke (2) Mittel zum Steuern des kontinuierlichen Ablaufens des Bandes erst in eine Eingangsvorrichtung (1) und dann in einen Vorwärmabschnitt (21), einen Glühabschnitt (22) mit Temperaturhaltung auf der je nach Art des Bandes gewünschten Höhe, einen ersten Abschnitt (23) zum schnellen Kühlen nach dem Glühen, einen Überalterungsabschnitt (24), einen zweiten Abschnitt (25) zum langsamen Kühlen unter Schutzatmosphäre und eine Ausgangsvorrichtung (3) umfasst, dadurch gekennzeichnet, dass ein Teil des Überalterungsabschnitts (24) entfällt, während die übrigen Abschnitte beibehalten werden, und dass eine Galvanisierungsanlage (4) innerhalb der Glühanlage (2) an dem so frei gewordenen Platz zwischen dem verbleibenden Teil (26) des Überalterungsabschnitts (24) und dem zweiten Abschnitt (25) zum langsamen Kühlen angeordnet wird und mit den Mitteln zum Steuern des Ablaufens so verbunden wird, dass eine kombinierte Glüh- und Galvanisierungsstrecke ohne Zunahme der Gesamtlänge der Glühstrecke (2) realisiert wird.
  8. Verfahren zur Umwandlung einer Glühstrecke in eine kombinierte Glüh- und Galvanisierungsstrecke nach Anspruch 7, dadurch gekennzeichnet, dass die Bandlaufgeschwindigkeit zwischen der Eingangsvorrichtung (1) und der Ausgangsvorrichtung (3) zum Herausführen des Bandes an den Galvanisierungsvorgang angepasst wird.
  9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass die Galvanisierungsanlage (4) nur einen Teil (26) des Überalterungsabschnitts (24) ersetzt und dass die Laufgeschwindigkeit des Bandes (M) bei Bedarf so geregelt wird, dass im verbleibenden Teil (26) des entsprechenden Abschnitts (24) eine Überalterungsbehandlung erfolgt.
  10. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die Temperatur im Glühabschnitt auf der unter Berücksichtigung der Art des Bandes und der Laufgeschwindigkeit zum Glühen gewünschten Höhe gehalten wird und dass der verbleibende Teil (26) des Überalterungsabschnitts (24) zwischen dem Ausgang des Abschnitts zum schnellen Kühlen (21) und dem Eingang zum Galvanisierungsbad (1) kombinierte Mittel zum Erwärmen und Kühlen zur Regelung der Temperatur des Bandes auf eine für den Galvanisierungsvorgang geeignete Höhe umfasst.
  11. Verfahren zur Umwandlung einer kontinuierlichen Glühstrecke (1, 2, 3) in eine kombinierte Glüh- und Galvanisierungsstrecke nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, dass die Galvanisierungsanlage (4) Mittel zum Steuern des Ablaufens des Bandes zwischen einem Galvanisierungsmetallbad (41) und einem Härtungsbad (45) entlang einer kontinuierlichen Ablaufbahn umfasst, die durch eine Vielzahl von Umlenkwalzen (D1 ... D6) definiert wird und mindestens vier Teile umfasst, und zwar einen ersten Verbindungsteil (T1) zwischen dem Abschnitt zum schnellen Kühlen (23) und dem Eingang zum Metallbad (41), einen zweiten Ausgangsteil (T2) des Metallbades (41) mit Kontrolle der Dicke der Beschichtung, einen dritten Teil (T3) zum Kühlen der Beschichtung vor dem Eingang zum Härtungsbad (45) und einen vierten Ausgangsteil (T4, T5) des Härtungsbades (45), der direkt an den Ausgangsabschnitt der Glühstrecke anschließt, ohne durch den Abschnitt zum langsamen Kühlen (25) zu verlaufen.
  12. Verfahren nach Anspruch 11, dadurch gekennzeichnet, dass zur Anpassung des Gesamtplatzbedarfs der Galvanisierungsanlage (4) an die Länge des frei gewordenen Platzes in der Glühstrecke (2) das Härtungsbad (45) oberhalb des Metallbades (41) und zur Eingangsseite der Strecke hin versetzt angeordnet wird, so dass das Band (M) im dritten Kühlteil (T3) wieder zurückläuft und im vierten Ausgangsteil (T4) des Härtungsbades (45) oberhalb oder unterhalb des Metallbades (41) und dann des Abschnitts zum langsamen Kühlen (25) verläuft, um direkt an die Ausgangsvorrichtung (3) der Strecke anzuschließen.
EP08831213A 2007-08-10 2008-07-03 Kombinierte glüh- und galvanisierungsleitung sowie verfahren zur umwandlung einer durchgehenden glühleitung in eine solche kombinierte leitung Active EP2176438B1 (de)

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Application Number Priority Date Filing Date Title
FR0757023A FR2919876B1 (fr) 2007-08-10 2007-08-10 Ligne combinee de recuit et de galvanisation et procede de transformation d'une ligne de recuit continu en une telle ligne combinee
PCT/FR2008/000968 WO2009034243A1 (fr) 2007-08-10 2008-07-03 Ligne combinée de recuit et de galvanisation et procédé de transformation d'une ligne de recuit continu en une telle ligne combinée

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WO2016001701A1 (en) * 2014-07-03 2016-01-07 Arcelormittal Polyvalent processing line for heat treating and hot dip coating a steel strip
FR3095452A1 (fr) * 2019-04-29 2020-10-30 Fives Stein Ligne de traitement en continu de bandes métalliques à double usage
CN110079658A (zh) * 2019-06-10 2019-08-02 苏州新凌电炉有限公司 一种环保型钢丝热处理生产线
CN112281079B (zh) * 2020-09-25 2021-11-19 河钢股份有限公司承德分公司 一种热基镀锌钢卷及其制备方法

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FR2919876B1 (fr) 2009-10-09
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DE602008004544D1 (de) 2011-02-24
WO2009034243A1 (fr) 2009-03-19

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