WO2024256062A1 - Procédé de production d'une bande d'acier revêtue - Google Patents

Procédé de production d'une bande d'acier revêtue Download PDF

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Publication number
WO2024256062A1
WO2024256062A1 PCT/EP2024/060165 EP2024060165W WO2024256062A1 WO 2024256062 A1 WO2024256062 A1 WO 2024256062A1 EP 2024060165 W EP2024060165 W EP 2024060165W WO 2024256062 A1 WO2024256062 A1 WO 2024256062A1
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WO
WIPO (PCT)
Prior art keywords
steel strip
temperature
steps
coating
heated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2024/060165
Other languages
German (de)
English (en)
Inventor
Jenny Rudnizki
Joachim Ohlert
Lutz Kümmel
Holger Behrens
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Group GmbH
Original Assignee
SMS Group GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE102023208949.1A external-priority patent/DE102023208949A1/de
Application filed by SMS Group GmbH filed Critical SMS Group GmbH
Priority to EP24720090.0A priority Critical patent/EP4724619A1/fr
Publication of WO2024256062A1 publication Critical patent/WO2024256062A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • 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
    • 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
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • 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
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments
    • 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
    • C23C2/04—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
    • C23C2/12—Aluminium 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
    • C23C2/26—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
    • C23C2/34—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 method for producing a coated steel strip according to the preamble of claim 1.
  • strip material is usually made from cast slabs that are hot rolled and cooled in coils.
  • hot rolling not only is the thickness reduced, but the cast structure is converted into a rolled structure.
  • the structure, or rather its composition and grain size are adjusted.
  • Hot rolling can be followed by a pickling process, which is usually followed by a cold rolling process. After cold rolling, a recrystallization annealing process usually takes place, which relieves the strain hardening caused by the forming.
  • a coating process can also be carried out.
  • WO 2020/079200 A1 discloses a method for producing a hot-formable flat steel product, comprising: a production step for producing a cold-rolled tempering steel flat product; a heating step for heating the tempering steel flat product; and a coating step for coating the heated tempering steel flat product using a hot-dip process.
  • the tempering steel flat product is heated in the heating step to a maximum temperature that is greater than or equal to a temperature of a melt bath used in the hot-dip process and less than an austenitizing temperature of the cold-rolled tempering steel flat product.
  • the tempering steel flat product heated in the heating step is fed to the coating step without an intermediate step or after carrying out an adjustment of the temperature of the tempering steel flat product to a coating temperature.
  • WO 2020/079200 A1 is based on the finding that the recrystallization of the heated quenched and tempered steel flat product fed to the coating step and the associated adjustment of the mechanical properties of the quenched and tempered steel flat product are unnecessary for hot forming, since the properties of the finished quenched and tempered steel flat product are adjusted at the end of hot forming. Accordingly, when producing cold-rolled (for example manganese-boron alloyed) quenched and tempered steel flat products, any recrystallizing annealing at a temperature greater than or equal to the austenitizing temperature of the cold-rolled quenched and tempered steel flat product (i.e. T > Ac3) can be dispensed with.
  • T > Ac3 the austenitizing temperature of the cold-rolled quenched and tempered steel flat product
  • the aim is generally to dispense with the cold rolling step.
  • the material properties in particular the strength values such as yield strength and tensile strength, are maintained.
  • the above-mentioned method according to WO 2020/079200 A1 does not take into account the increase in strength that occurs as part of the work hardening during cold rolling and thus deviates from the material properties set by hot rolling.
  • the end product produced with it does not have the anticipated material properties.
  • the material strength achieved after the production of the coated strip is not set sufficiently precisely, since the forming influences are not taken into account or eliminated by cold rolling and any necessary toughness is not present.
  • a method for producing a galvanized steel sheet for hot stamping comprises heat treating a hot-rolled pickled steel sheet or cold-rolled steel sheet in a reducing atmosphere, and then galvanizing the steel sheet.
  • the heat treatment of the steel sheet is carried out at a temperature of 500 °C to 700 °C for a duration of 30 to 270 seconds, with the warm-up rate being invariably 8 °C/second.
  • the invention is based on the object of achieving an improvement in the material properties of a coated steel strip in a simple and inexpensive manner.
  • a method according to the present invention is for producing a coated steel strip and comprises the steps:
  • step (d) hot-dip coating the steel strip, wherein in step (c) the steel strip is heated to a target temperature which is below the recrystallization temperature and above the melt bath temperature of step (d), and wherein in step (c) the steel strip is heated at a heating rate of at least 10 K/second.
  • the method according to the invention is based on the essential finding that, thanks to the heating rate, which assumes a value of at least 10 K per second during the heat treatment of the steel strip in step (c), the yield point and the tensile strength of the steel strip are increased.
  • What is important for the present invention is that such an increase in the yield point and tensile strength of the steel strip can be achieved without the addition of alloying components, which are usually expensive.
  • this increase in the yield point and tensile strength according to the present invention is based, among other things, on the fact that precipitations of microalloying elements, such as vanadium (V) and/or niobium (Nb), are not formed during the heat treatment of the steel strip in step (c). are fully implemented and thus there is a percentage increase in the content of these microalloying elements in the structure of the steel strip. It should also be noted that the influence on the breaking strength of the steel strip is variable.
  • step (d) in which a hot-dip coating of the steel strip is carried out.
  • step (a) of the method according to the invention no cold rolling of the steel strip takes place in step (a) of the method according to the invention.
  • step (c) the heating rate for the steel strip is between 10 and 40 K/second.
  • the heating rate for the steel strip can expediently be between 15 and 35 K/second.
  • the target temperature to which the steel strip is heated is between 400°C and 650°C.
  • this target temperature can be between 520°C and 620°C.
  • this predetermined holding time can be between 3 and 30 seconds, or between 5 and 20 seconds.
  • the heat treatment of the steel strip according to step (c) takes place entirely under a protective atmosphere.
  • the heat treatment zone is expediently When the steel strip enters this area, where the protective atmosphere prevails, it is sealed against air by a lock passage.
  • a lock passage can be equipped with contact brushes for the purpose of sealing against air.
  • the heat treatment takes place entirely under a protective atmosphere.
  • the heat treatment zone is sealed against air by a lock passage (with contact brushes) as the strip enters the area.
  • a protective atmosphere which is present when carrying out step (c) contains at least nitrogen.
  • the above-mentioned protective atmosphere can be provided to have a hydrogen content of between 10 and 50% and a dew point which is between -50°C and -10°C.
  • the heat treatment of the steel strip according to step (c) takes place under a protective atmosphere and a slight overpressure is set for this purpose.
  • a slight overpressure can expediently assume the value of 2 mbar in comparison to the ambient pressure.
  • step (c) With regard to all of the above-mentioned developments of the method according to the invention in which a protective atmosphere is provided for carrying out step (c), it should be pointed out separately at this point that in the course of the heat treatment after this step (c) at least the cooling of the steel strip to the bath temperature also takes place. In other words, in step (c) at least the cooling of the steel strip to the bath temperature takes place under a protective atmosphere.
  • the bath temperature is in the range of 440 to 460 °C when coating with zinc, in the range of 360 to 460 °C when coating with zinc-magnesium or 580 °C when coating with Galvalum.
  • step (b) the surface cleaning of the steel strip takes place at a temperature which is below 100°C.
  • step (a) the steel strip is produced by hot rolling, wherein following step (a) the steel strip is cooled to a temperature which is above the ambient temperature before carrying out steps (b) and (c).
  • step (c) when step (c) is carried out, at least one parameter is set to a predetermined value, this parameter being selected from a group consisting of the throughput speed of the steel strip, the target temperature of the steel strip according to step (c) and/or the holding time of the steel strip.
  • the at least one parameter is set in a controlled manner using a control loop or is kept at a predetermined value.
  • step (a) in which the steel strip is produced, no cold rolling of the steel strip is carried out.
  • the present invention relates to the production of rolled steel strips, whereby a reduction in thickness by cold rolling is eliminated and the final thickness of the steel strip is already set during hot rolling.
  • a fine calibration of the final thickness can be carried out in the subsequent coating process in the reduction range of up to 15% (preferably up to 10%).
  • the material properties of a hot-rolled steel strip can be further improved after hot rolling, in particular thanks to the rapid heating rate of at least 10 K/s; additional rolling steps with a thickness reduction are not required for this.
  • Fig. 1 is a flow chart of an embodiment of a method according to the invention.
  • Fig. 2 is a flow chart of a further embodiment of the method according to the invention.
  • a method according to an embodiment of the present invention comprises several steps which are carried out one after the other in order to produce a coated steel strip.
  • this method comprises the following steps:
  • step (a) of the above-mentioned process according to the invention it is pointed out that the production of a hot-rolled strip or
  • steel strip can be produced by continuous casting and subsequent hot rolling of the continuous cast product.
  • step (a) according to the method according to the invention can also provide for a targeted cooling of the steel strip for the purpose of setting a defined microstructure.
  • step (b) of the above-mentioned method according to the invention it is pointed out that the surface cleaning of the steel strip provided for in this case can preferably be carried out by pickling. Alternatively, other methods for cleaning the steel strip are also possible. In any case, the Surface temperature of the steel strip during surface cleaning according to step (b) below 100 °C.
  • step (c) the steel strip is heated to a target temperature which is below the recrystallization temperature and has at least the value of the melt bath temperature from step (d).
  • the target temperature to which the steel strip is heated in step (c) is above the melt bath temperature from step (d).
  • step (c) the steel strip is heated at a heating rate of at least 10 K/second.
  • the heating rate depends on the alloy and the pre-settings. This heating rate can be in the range of 10 to 50 K/second, preferably in the range of 10 to 40 K/second, particularly preferably in the range of 15 to 35 K/second. And/or:
  • the temperature window (i.e. the target temperature to which the steel strip is heated) is in the range between 400°C and 650°C, preferably in the range between 520°C and 620°C. And/or:
  • the target temperature to which the steel strip is heated (also referred to as “holding time” in the context of the present invention) is between 3 and 30 seconds, preferably between 5 and 20 seconds. And/or:
  • the steel strip After heating to the target temperature and a predetermined holding time has elapsed, the steel strip can be cooled, in particular moderately, to a bath temperature, for example to a temperature of up to about 460 °C. And/or: After the steel strip has reached such a bath temperature, step (d) is then carried out to coat the steel strip. And/or:
  • the steel strip is heated again in a targeted and, in particular, moderate manner up to a maximum of 600 °C.
  • a radiant heater can be used, which is applied to at least part of the Route along which the steel strip undergoes heat treatment is provided or installed.
  • the cooling of the steel strip to the bath temperature can take place within a period of between 10 and 100 seconds. It is expedient for the steel strip to be cooled to the bath temperature to take place within a period of between 20 and 60 seconds. And/or:
  • At least the cooling of the steel strip to the bath temperature can be done under a protective atmosphere.
  • the heat treatment of the steel strip according to step (c) can take place entirely under a protective atmosphere.
  • a protective atmosphere In order to avoid repetition, reference may be made to the aspects of the protective atmosphere that have already been explained elsewhere above. And/or:
  • the bath temperature is in the range of 440 to 460 °C when coating with zinc, in the range of 360 to 460 °C when coating with zinc-magnesium, or 580 °C when coating with Galvalum.
  • the method according to the invention can be designed such that the above-mentioned steps (c) and (d) are combined to form an endless process. In the sense of the present invention, this means that when combining these steps (c) and (d), any type of transformation between the Belt cleaning and warming up are omitted.
  • An optimal throughput speed of the two continuous steps (c) and (d) is between 30 and 180 m/min.
  • the dwell time in a zone in which steps (c) and (d) are carried out is between 1 and 100 seconds, preferably between 1 and 60 seconds.
  • the method according to the invention can be designed so that the above-mentioned steps (b), (c) and (d) are combined to form a continuous process.
  • the preferred distance from the end of the heating zone in which step (c) is carried out to the entry of the steel strip into the melting pot or melting bath for carrying out step (d) is between 10 and 50 m. If the steel strip is also reduced in step (c), the distance is slightly different depending on the protective atmosphere and its setting.
  • the throughput speed for the steel strip is set such that it is between 30 and 180 m/min. This is due to the continuous process through which the steel strip goes.
  • Fig. 2 shows a flow chart for a further preferred embodiment of the method according to the invention.
  • a further step (e) is carried out after step (d), in which the steel strip is skin-passed and/or stretch-straightened.
  • this can be done close to the surface, for example in the range of 0.2 and 10%.
  • step (e) the degree of skin-passing can be ⁇ 10%.
  • the degree of skin-passing can also assume a value of ⁇ 5%.
  • step (e) the deformation of the steel strip is > 3%, then the temperature of the steel strip is ⁇ 60°C.
  • the inlet temperature of the steel strip into the stand should generally not be > 60°C
  • Steps (b), (c), (d) and (e) can be combined to form a continuous process.
  • a skin-pass and/or stretch-straightening process advantageously improves the flatness of the steel strip and/or eliminates pronounced yield points.
  • step (e) In connection with a skin-pass and/or stretch-leveling process according to step (e), there is a possibility that such a forming process will lead to an increase in the temperature of the steel strip. In view of this, it is advantageous if the temperature at the coater is ⁇ 45° C. This can also be achieved by additional cooling steps, for example by using cooling rollers.
  • the method according to the invention can be designed to incorporate the hot rolling of the steel strip into one of the aforementioned endless processes in which steps (c) and (d), or steps (b), (c) and (d), or steps (b), (c), (d) and (e) are suitably combined with one another as explained.
  • the steel strip is cooled to a level higher than the ambient temperature using the residual temperature of the hot strip in order to keep the heating processes before surface cleaning in step (b) and for heating in step (c) as energy-efficient as possible.
  • coupling with a strip casting plant is particularly suitable for this purpose, namely because of similar process speeds.

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

Abstract

L'invention concerne un procédé de production d'une bande d'acier revêtue comprenant les étapes consistant à : (a) produire une bande d'acier, (b) nettoyer une surface de la bande d'acier, (c) traiter thermiquement la bande d'acier pour préparer son revêtement, (d) réaliser un revêtement par immersion à chaud sur la bande d'acier, dans l'étape (c) la bande d'acier étant chauffée à une température cible qui est inférieure à la température de recristallisation et supérieure à la température de bain de fusion de l'étape (d), caractérisé en ce que, à l'étape (c), la bande d'acier est chauffée à une vitesse de chauffage d'au moins 10 K/seconde.
PCT/EP2024/060165 2023-06-12 2024-04-15 Procédé de production d'une bande d'acier revêtue Ceased WO2024256062A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP24720090.0A EP4724619A1 (fr) 2023-06-12 2024-04-15 Procédé de production d'une bande d'acier revêtue

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102023205416.7 2023-06-12
DE102023205416 2023-06-12
DE102023208949.1 2023-09-14
DE102023208949.1A DE102023208949A1 (de) 2023-06-12 2023-09-14 Verfahren zum Herstellen eines beschichteten Stahlbands

Publications (1)

Publication Number Publication Date
WO2024256062A1 true WO2024256062A1 (fr) 2024-12-19

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0480122A2 (fr) * 1990-10-09 1992-04-15 Nippon Steel Corporation Procédé de revêtement d'une tôle d'acier par immersion à chaud en déposant une couche préliminaire de nickel
CN105908079A (zh) * 2016-06-20 2016-08-31 首钢总公司 一种高强度钢的处理方法
EP3406748A1 (fr) * 2016-01-22 2018-11-28 JFE Steel Corporation Tôle d'acier à haute résistance et son procédé de fabrication
EP2832884B1 (fr) * 2012-03-30 2019-08-14 voestalpine Stahl GmbH Feuille d'acier galvanisé par immersion à chaud pour un formage par pressage, ayant d'excellentes aptitude au façonnage à froid, trempabilité dans un moule et propriétés de surface, et son procédé de fabrication
EP2843077B1 (fr) 2012-04-23 2020-01-08 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Procédé de production d'une tôle d'acier galvanisée, destinée à l'estampage à chaud, tôle d'acier allié galvanisée par immersion à chaud et la utilisation
EP2740813B1 (fr) * 2011-08-05 2020-04-22 JFE Steel Corporation Tôle d'acier galvanisée par immersion à chaud et son procédé de fabrication
WO2020079200A1 (fr) 2018-10-18 2020-04-23 Sms Group Gmbh Procédé de fabrication d'un produit en acier plat thermofaçonné
WO2022029033A1 (fr) * 2020-08-04 2022-02-10 Muhr Und Bender Kg Procédé de production d'une bande d'acier revêtue, et procédé de production d'un produit d'acier trempé à partir de celle-ci

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0480122A2 (fr) * 1990-10-09 1992-04-15 Nippon Steel Corporation Procédé de revêtement d'une tôle d'acier par immersion à chaud en déposant une couche préliminaire de nickel
EP2740813B1 (fr) * 2011-08-05 2020-04-22 JFE Steel Corporation Tôle d'acier galvanisée par immersion à chaud et son procédé de fabrication
EP2832884B1 (fr) * 2012-03-30 2019-08-14 voestalpine Stahl GmbH Feuille d'acier galvanisé par immersion à chaud pour un formage par pressage, ayant d'excellentes aptitude au façonnage à froid, trempabilité dans un moule et propriétés de surface, et son procédé de fabrication
EP2843077B1 (fr) 2012-04-23 2020-01-08 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Procédé de production d'une tôle d'acier galvanisée, destinée à l'estampage à chaud, tôle d'acier allié galvanisée par immersion à chaud et la utilisation
EP3406748A1 (fr) * 2016-01-22 2018-11-28 JFE Steel Corporation Tôle d'acier à haute résistance et son procédé de fabrication
CN105908079A (zh) * 2016-06-20 2016-08-31 首钢总公司 一种高强度钢的处理方法
WO2020079200A1 (fr) 2018-10-18 2020-04-23 Sms Group Gmbh Procédé de fabrication d'un produit en acier plat thermofaçonné
WO2022029033A1 (fr) * 2020-08-04 2022-02-10 Muhr Und Bender Kg Procédé de production d'une bande d'acier revêtue, et procédé de production d'un produit d'acier trempé à partir de celle-ci

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