EP3097218B1 - Procédé et installation de revêtement au trempé à chaud de feuillard d'acier laminé à chaud - Google Patents

Procédé et installation de revêtement au trempé à chaud de feuillard d'acier laminé à chaud Download PDF

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Publication number
EP3097218B1
EP3097218B1 EP15702989.3A EP15702989A EP3097218B1 EP 3097218 B1 EP3097218 B1 EP 3097218B1 EP 15702989 A EP15702989 A EP 15702989A EP 3097218 B1 EP3097218 B1 EP 3097218B1
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EP
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Prior art keywords
strip
cold
thickness
hot
galvanising
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German (de)
English (en)
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EP3097218A1 (fr
Inventor
Andreas Gramer
Werner Haupt
Hartmut Sulenski
Anja Maria Eder
Peter Jollet
Hans Georg Klöckner
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SMS Group GmbH
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SMS Group GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/227—Surface roughening or texturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0242—Flattening; Dressing; Flexing
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
    • C21D8/0284—Application of a separating or insulating coating
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0436—Cold rolling
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0442—Flattening; Dressing; Flexing
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0478—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing involving a particular surface treatment
    • C21D8/0484—Application of a separating or insulating coating
    • 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
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • 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
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/228—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length skin pass rolling or temper rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/14—Reduction rate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/021—Rolls for sheets or strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product

Definitions

  • the invention relates to a process for hot-dip coating of hot-rolled steel strip in a continuous strip plant in which the hot strip is subjected to a pretreatment for descaling, is galvanized, is reduced by cold working in its thickness and undergoes a post-treatment. Furthermore, the invention relates to a plant for producing hot-dip coated, hot rolled steel strip.
  • the liberation of the hot strip from the scale (pretreatment) as a prerequisite for cold forming and galvanizing is preferably carried out by pickling, rinsing and drying.
  • a straightening and / or a chemical treatment can be provided for the aftertreatment.
  • the finished product thus prepared is in a z. B. a tape storage and a trimming scissors having outlet part to tape coils wound with a desired diameter.
  • EP 0 613 736 A1 and EP 2 816 132 B1 For example, methods for hot-dip coating a hot-rolled metal strip are known, wherein the hot-rolled strip is subjected to a thickness reduction before the coating process.
  • EP 1 681 363 A1 shows a generic method according to the preamble of claim 1, and a corresponding plant according to the preamble of claim 3.
  • the invention is therefore an object of the invention to provide a method and a system of the type mentioned, with which can reach high quality, galvanized bands and strip surfaces without the disadvantages mentioned.
  • the thickness of the cold-formed strip is measured before galvanizing and a deviation from a nominal thickness as a controlled variable for the reduction in thickness of the cold forming is attributed, a controlled reduction in thickness can be achieved.
  • the galvanizing the size of the cold forming preferably the reduction in thickness
  • the size of the cold forming which also includes a determined from the difference in belt speeds in the inlet and delivery of the cold rolling mill, a controlled thickness control is unnecessary when using hot strip with correspondingly narrow hot strip thickness tolerances.
  • constant cold working improved constant material properties eg. As yield strength, tensile strength and elongation at break, which can not be achieved with controlled thickness decrease so.
  • further cold forming the strip thickness is reduced by 4 to 10% by cold rolling, wherein at least after this further strip forming the strip thickness measured and deviations are fed from a target strip thickness as a controlled variable of the cold forming.
  • a control can be provided for a constant reduction in thickness.
  • the size of the cold forming after galvanizing to reduce the strip thickness can be controlled and controlled to a desired value, which makes the use of hot strip with correspondingly narrow hot strip thickness tolerances a controlled thickness control superfluous.
  • the inventive method thus provides the prerequisites for adjusting the strip roughness to a required value before galvanizing by cold forming and / or reducing the thickness tolerance before galvanizing by cold rolling and / or reducing the strip thickness to a desired level by cold rolling prior to galvanizing, with individual ones the aforementioned parameters tape roughness, tape thickness tolerance and tape thickness in coordination with the upstream cold forming can be adjusted or supplemented by a further cold forming after galvanizing.
  • the hot strip galvanizing can be carried out with at least one controlled thickness control either before or after galvanizing or without controlled reduction in thickness by controlling the size of the cold forming or the degree of temper rolling.
  • the galvanizing previous process steps such as strip pretreatment and / or cold forming are performed in a galvanizing line separate, outsourced treatment lines, wherein in the galvanizing line next the application of the zinc layer can also be cold-formed after galvanizing and after-treatment of the strip.
  • the descaling process may be carried out in a severed pickling line or the cold rolling process may be performed in a severed cold rolling mill before the strip then reaches the galvanizing line with subsequent subsequent treatments such as straightening, passivating, and the like.
  • the inventive plant for carrying out the above-described method of producing hot dip coated hot rolled steel strip is defined in claim 3.
  • This is characterized in that the hot strip passes through a strip pre-treatment device for removing the scale, then by cold forming the strip thickness is reduced by 0.5 to 10%, and then this passes through the strip galvanizing, in which the band passes through a molten bath ,
  • the strip galvanizing device is followed by another thickness reduction device.
  • work rolls each come in cold forming for impressing the strip surface structure of the finished product used, which have a surface texture with a mean roughness Ra of 0.2 to 3 microns.
  • the thickness reduction device is designed as a cold rolling stand, which is associated with at least one measuring device in the outlet with feedback of thickness control signals to the cold rolling stand.
  • the cold forming is performed to reduce the thickness with a cold rolling mill, in which in a turn preferred embodiment, at least one meter is arranged in the outlet of the cold rolling mill and either deviations from a desired thickness as a control signal to the thickness control of the cold rolling mill are returned or which is regulated by a control to a constant amount of thickness reduction.
  • the strip galvanizing device be followed by a further thickness reduction device designed as a cold rolling stand, in which the strip thickness is reduced by less than 0.5 to 10%, at least this further cold rolling stand being at least a measuring device in the outlet with feedback of measurement signals for thickness control is assigned.
  • a cold working is a "cold rolling”
  • the thickness reducing means are designed as “cold rolling stands”.
  • hot-dip coating equipment 1 working in continuous operation hot-dip coating equipment 1 is a treated, hot-rolled steel strip 2 from a z. B. with not shown straightening units and a tape storage equipped inlet part ET initially supplied to a belt pretreatment device 3, which has a scale breaker 4 or the like and a pickling 5 and a sink 6 for removing the scale from the steel strip or band 2.
  • the band pretreatment device 3 is followed by the dashed bordered or highlighted core of the hot dip coating installation 1, namely a strip galvanizing device 7 upstream thickness reduction device 8, designed as a cold rolling KWW as a preferred form of cold forming before the steel or hot strip 2 in the Strip galvanizing 7 for applying the coating passes through a molten bath 9.
  • At least one thickness measuring device 10 with feedback of the measuring signals to the cold rolling mill is arranged by way of example for deviations measured from a nominal thickness.
  • a measuring method can be used at the KWW that does not measure the thickness but the size of the cold forming or a skin pass rate and outputs it as a control signal.
  • cold working in the thickness reducer 8 cold working is performed by reducing the sheet thickness by 0.5 to 10%.
  • a surface structure is impressed on the strip, for which purpose the work rolls having a surface structure with a mean roughness Ra of 0.2 to 3 ⁇ m are formed.
  • FIG. 1 shows further that the strip galvanizing 7 optionally a further thickness reduction device 11, in a preferred embodiment also as a cold rolling mill KWW, can be followed.
  • the work rolls of this further thickness reduction device 11 can then be designed so that they imprint the surface texture of the finished product with a mean roughness Ra of 0.2 to 3 ⁇ m, during cold forming of the strip.
  • a measuring device 12 arranged in the outlet of the further thickness reduction device 11 returns the deviation from a nominal strip thickness as a controlled variable of the cold forming of the thickness reduction device 11.
  • the thickness reduction device 11 for cold forming in the preferred form of a cold rolling mill can also carry out the process of temper rolling with 0.5 to 2%, temper rolling degree behind the strip galvanizing device 7 instead of a controlled thickness control. Furthermore, the KWW can perform the cold forming with less than 30%, preferably 0.5 to 10%, even with a constant setpoint of the cold forming.
  • the hot strip 2 cold-formed in this way with a surface structure then passes through a strip aftertreatment device 13 which, in the plant example, has a draft straightener STR and a chemical treatment part ChBT, eg.
  • a strip aftertreatment device 13 which, in the plant example, has a draft straightener STR and a chemical treatment part ChBT, eg.
  • passivation may include, from which the hot strip 2 as a finished product in the example, with a trimming shear and a tape storage (not shown) equipped outlet part AT arrives.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Coating With Molten Metal (AREA)

Claims (7)

  1. Procédé pour l'enduction par immersion à chaud d'une bande métallique laminée à chaud dans une installation de production de bande en continu, dans lequel
    - on soumet la bande laminée à chaud à un prétraitement à des fins de décalaminage ;
    - on réduit son épaisseur dans une étape opératoire précédant la galvanisation, par transformation à froid ;
    - on la soumet à une galvanisation ;
    - on réduit son épaisseur dans une étape opératoire faisant directement suite à la galvanisation, par transformation à froid ; et
    - on la soumet à un traitement ultérieur ;
    caractérisé en ce que la bande laminée à chaud, libérée de la calamine, est soumise à une transformation à froid dans l'étape opératoire qui précède la galvanisation, avec une réduction de son épaisseur de bande de l'ordre de 0,5 à 10 % ; et en ce que, lors des deux transformations à froid, c'est-à-dire aussi bien avant qu'après l'étape opératoire de la galvanisation, on imprime à la bande une structure superficielle via un procédé de laminage à froid dans une cage de laminoir à froid en utilisant des cylindres de travail possédant une structure superficielle avec une valeur de rugosité moyenne Ra de 0,2 à 3 µm.
  2. Procédé selon la revendication 1, caractérisé en ce que, dans la transformation ultérieure à froid, qui fait directement suite à la galvanisation, on réduit l'épaisseur de la bande par laminage à froid à concurrence de 4 à 10 % ; dans lequel, au moins après cette transformation ultérieure à froid, on mesure l'épaisseur de la bande et on alimente la transformation à froid avec des déviations par rapport à une épaisseur de bande de consigne faisant office de variable de réglage.
  3. Installation (1 ; 100) pour la fabrication d'une bande en acier (2) enduite par immersion à chaud, que l'on obtient par laminage à chaud, dans une ligne de traitement en continu, comprenant un mécanisme de prétraitement de la bande (3) qui inclut le décalaminage, un mécanisme de galvanisation de la bande (7), au moins un mécanisme de réduction de l'épaisseur (8 ; 11) par laminage à froid de la bande et un mécanisme de traitement ultérieur de la bande (13), pour la mise en oeuvre du procédé selon la revendication 1 ou 2 ; dans laquelle, fait directement suite, au mécanisme de prétraitement de la bande (3) pour la bande laminée à chaud, libérée de la calamine, d'abord le mécanisme de réduction de l'épaisseur (8), et faisant suite à ce dernier, le mécanisme de galvanisation de la bande (7) dans lequel la bande laminée à chaud passe à travers un bain de fusion (9) ; dans laquelle, au mécanisme de galvanisation de la bande (7), fait directement suite un mécanisme supplémentaire de réduction de l'épaisseur (11) réalisé sous la forme d'une cage de laminoir à froid (KWW) ; caractérisée en ce que, avec le mécanisme de réduction de l'épaisseur (8) qui est disposé avant le mécanisme de galvanisation de la bande (7), on peut réduire l'épaisseur de la bande à concurrence de 0,5 à 10 % ; en ce que, avec le mécanisme de réduction de l'épaisseur (11) qui est disposé après le mécanisme de galvanisation de la bande (7) et qui est réalisé sous la forme d'une cage de laminoir à froid (KWW), on peut réduire l'épaisseur de la bande à concurrence de 0,5 à 10 % ; et en ce que les mécanismes de réduction de l'épaisseur (8 ; 11) comprennent, lors des transformations à froid, à des fins d'impression de la structure superficielle de bande du produit fini, respectivement des cylindres de travail qui présentent une structure superficielle avec une valeur de rugosité moyenne Ra de 0,2 à 3 µm.
  4. Installation selon la revendication 3, caractérisée en ce que le mécanisme de réduction de l'épaisseur (8), qui est disposé avant le mécanisme de galvanisation de la bande (7), est réalisé sous la forme d'une cage de laminoir à froid (KWW) à laquelle est attribué, au moins à la sortie de la cage de laminoir à froid (KWW), un appareil de mesure (10) à des fins de rétroaction de signaux de mesure pour un réglage de l'épaisseur de la cage de laminoir à froid (KWW).
  5. Installation selon la revendication 3, caractérisée en ce que le mécanisme de réduction de l'épaisseur (8), qui est disposé avant le mécanisme de galvanisation de la bande (7), est réalisé sous la forme d'une cage de laminoir à froid (KWW) qui est réalisée avec un réglage à une valeur constante de la réduction de l'épaisseur.
  6. Installation selon l'une quelconque des revendications 3 à 5, caractérisée en ce que, en ce qui concerne le mécanisme de réduction de l'épaisseur (11) sous la forme de la cage de laminoir à froid (KWW) qui est disposée directement à la suite du mécanisme de galvanisation de la bande (7), est disposé, à la sortie avec rétroaction de signaux de réglage de l'épaisseur à la cage de laminoir à froid (KWW), au moins un appareil de mesure (12) à des fins de rétroaction de signaux de mesure pour un réglage de l'épaisseur de la cage de laminoir à froid (KWW).
  7. Installation selon l'une quelconque des revendications 3 à 6, caractérisée en ce que le mécanisme de réduction de l'épaisseur (11), sous la forme de la cage de laminoir à froid (KWW), qui est disposé directement à la suite du mécanisme de galvanisation de la bande (7), est réalisé avec un réglage à une valeur constante de la réduction de l'épaisseur.
EP15702989.3A 2014-01-22 2015-01-21 Procédé et installation de revêtement au trempé à chaud de feuillard d'acier laminé à chaud Active EP3097218B1 (fr)

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DE102015200764.2A DE102015200764A1 (de) 2014-01-22 2015-01-20 Verfahren und Anlage zum Schmelztauchbeschichten von warmgewalztem Stahlband
PCT/EP2015/051175 WO2015110490A1 (fr) 2014-01-22 2015-01-21 Procédé et installation de revêtement au trempé à chaud de feuillard d'acier laminé à chaud

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CN108480417B (zh) * 2018-02-01 2021-04-13 日照宝华新材料有限公司 基于薄板坯连铸连轧热基原料及酸镀连续产线生产600g锌层无锌花热镀锌板的方法
CN108220855B (zh) * 2018-02-08 2020-04-24 鞍山发蓝股份公司 一种高强度包装用镀锌钢带的制备方法
CN108950382A (zh) * 2018-06-25 2018-12-07 日照钢铁控股集团有限公司 一种基于无头带钢生产线和酸镀连续产线生产热基无花镀锌板的方法
CN109280872A (zh) * 2018-11-06 2019-01-29 江苏国电新能源装备有限公司 一种循环镀锌生产线
DE102021129934A1 (de) * 2021-11-17 2023-05-17 Thyssenkrupp Steel Europe Ag Verfahren zum Herstellen eines schmelztauchbeschichteten Stahlblechs und schmelztauchbeschichtetes Stahlblech

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EP3097218A1 (fr) 2016-11-30
WO2015110490A1 (fr) 2015-07-30

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