EP2044234B1 - Verfahren zum flexiblen walzen von beschichteten stahlbändern - Google Patents

Verfahren zum flexiblen walzen von beschichteten stahlbändern Download PDF

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Publication number
EP2044234B1
EP2044234B1 EP08707473.8A EP08707473A EP2044234B1 EP 2044234 B1 EP2044234 B1 EP 2044234B1 EP 08707473 A EP08707473 A EP 08707473A EP 2044234 B1 EP2044234 B1 EP 2044234B1
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EP
European Patent Office
Prior art keywords
hot
coating
strip
thickness
cold
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Active
Application number
EP08707473.8A
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German (de)
English (en)
French (fr)
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EP2044234A2 (de
Inventor
Josef Faderl
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Voestalpine Stahl GmbH
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Voestalpine Stahl GmbH
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    • 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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/20—Strips; Plates
    • 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
    • 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
    • B21B37/24—Automatic variation of thickness according to a predetermined programme
    • B21B37/26—Automatic variation of thickness according to a predetermined programme for obtaining one strip having successive lengths of different constant thickness
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching

Definitions

  • the invention relates to a method for flexible rolling of coated steel strips.
  • a method and apparatus for refining flexibly rolled strip material is known.
  • the material thickness of this strip is changed periodically to produce in a continuous process, the starting material for single boards, which has adapted material thicknesses according to the requirements of the sheet metal parts to be produced therefrom in the tape longitudinal direction.
  • the strip material is first wound on a coil. A heat treatment usually takes place on the wound coil. The strip is then unwound from the coil, subjected to a surface treatment and wound up again on a coil. Only then, in a further process, the separation of individual boards and the further processing to individual sheet metal components.
  • the task of DE 10 2004 023 886 A1 to propose an improved method and a device adapted thereto with which the finishing of the flexibly rolled strip material can be simplified and improved.
  • the task is to be achieved in that the tape is produced as a flexible rolled strip material, is wound and then unwound from the coil and heat treated in a single continuous pass through a treatment line of annealing, quenching, preheating unit and zinc bath and hot dip galvanized.
  • a continuous furnace with an annealing section and a quenching section, a preheating and a zinc bath is provided and a final Abblasdüse.
  • the galvanizing takes place at 470 ° to 500 ° C, with part of the energy used for the previous heat treatment for the galvanizing process to be exploited.
  • excess adhesive zinc be blown off the strip material to achieve a precisely set layer thickness, which also determines the strip thickness and should serve to control the nozzle spacing.
  • From the DE 10 2005 031 461 A1 is a method for producing a microalloyed cold strip with a matched to the thickness profile property profile known, wherein a hot strip of steel is rolled with a substantially homogeneous thickness and strength to a cold strip having a substantially constant strip thickness with Abwalzgraden in the range between 5 and 60% , an annealing of the cold strip at a temperature between 500 ° and 600 ° C is performed and a second rolling of the cold strip is performed, wherein the rolling is performed flexibly such that predefined thickness profiles are set with a region of higher thickness and a region of lesser thickness and then a second annealing treatment is performed.
  • Rolling process performed by a nip formed between two work rolls and the roll gap is selectively moved during the rolling process to achieve over the length of the metal strip different thicknesses.
  • This flexible rolling should be characterized in that during the rolling process, the nip is selectively moved, whereby different lengths of tape sections are rolled with different tape thicknesses that can be connected to each other via different slopes.
  • the aim of flexible rolling is to produce rolled products with load and weight optimized cross-sectional shapes.
  • the EP 1 074 317 B1 proposes improved process control for flexible rolling to achieve a metal strip with improved flatness even with wide belts.
  • EP1861517 B1 discloses a process for hot dip steel strip hot dip coating in which a hot strip is hot dip coated and the finished thickness and thickness tolerance of the hot dip coated steel strip is achieved by controlled thickness reduction in a process line mill scale wherein at least one thickness gauge in the outlet of the mill stand is reached the finished thickness is controlled and deviations from this up or down as a control signal to the employment of the rolling stand are returned to increase or reduce the thickness reduction accordingly.
  • the object of the invention is to provide flexibly rolled and provided with a corrosion protection sheets for the press hardening process available, which are considerably cheaper than previously produced and uniform despite the flexible rolling in their remaining properties.
  • the flexible rolling is carried out with different rolling pressures in order to produce different thicknesses of the steel strip. So far, no galvanized or otherwise coated sheets have been used for this, since the flexible rolling also affects the coating thickness of the coating.
  • the possible coatings with which the flexible rolls to be rolled can be coated according to the invention are hot-dip coatings and electrolytic coatings.
  • Possible hot-dip coatings are z. As hot-dip galvanized layers or mecanicaluminATOR layers but also mixed forms thereof, ie alloys of zinc and aluminum but also of zinc and other metals or aluminum and other metals.
  • electrolytic coatings are, for example, electrolytically applied zinc layers, but of course other electrolytically applied metal layers are also possible.
  • inventively recognized problems that the different sheet thicknesses give different heating curves over the tape length and that different zinc layer thicknesses arise as a result of the flexible rolling process are inventively achieved in that a hot strip is hot dip galvanized before flexible rolling and / or the emissivity or the degree of absorption is influenced by mechanical or chemical treatment of the zinc surface.
  • a different heat absorption capacity over the strip length can be achieved.
  • the degree of absorption in a region in which the tape and / or the coating is particularly thin is set poorly, while being particularly well adjusted in the region in which the tape and / or the coating is particularly thick. Of course, appropriate intermediate levels are met.
  • the zinc layer thickness is preset by means of variable adjustment of the stripping pressure or additional electromagnetic fields during hot-dip galvanizing of the hot strip , Areas that are then very flexible very flexible Thus, after being hot-dip galvanized, they have a thicker layer of zinc, while areas that remain thicker have a thinner layer of zinc.
  • the corresponding different intermediate areas are also set here or are readily adjustable.
  • the procedure according to the invention makes it possible to achieve a significantly more cost-efficient production of flexible rolled sheet metal automotive parts, since the transport costs of the coils for the post-galvanizing and the bell annealing usual in the prior art are eliminated.
  • Wuppermann method Wuppermann method
  • Fig. 2 Wuppermann method
  • hitherto uncoated hot strip was usually calibrated from ordinary automotive steels, then flexibly rolled and then subjected to recrystallization annealing to reverse the microstructural changes produced by rolling.
  • This recrystallization annealing usually takes place in a crucible annealing furnace, wherein the strip is previously unwound into a so-called coil and annealed as a whole coil. Subsequently, these annealed coils are transported to a galvanizing plant and there galvanized and then transported back again, cut boards and shaped components, which then yield the final product.
  • a hot strip or cold strip is fed to a hot-dip galvanizing plant in which the strip is unwound from the coil, welded to the preceding strip and then passed through the galvanizing plant.
  • a heating of the strip and then the known per se implementation by the galvanizing takes place.
  • the stripping device produces a zinc layer with a thickness that can be applied flexibly.
  • the stripping device can also be a system which acts on the zinc layer by stripping off an electromagnetic field.
  • hot-dip galvanizing process can, of course, be used equally well in other hot-dip galvanizing applications, for example, fire aluminizing or hot-dip coatings of aluminum-based alloys or zinc-based alloys and alloys of other metals or more metals than zinc and aluminum.
  • the layer thickness to be applied is controlled by the strength of the electrolytically active stream and / or the strip speed in the electrolytic coating bath, the control system basically also being used as the control with which the positionally accurate deviation of the different sheet thicknesses during flexible rolling is also carried out.
  • the flexible rollers can follow, with the flexible rollers, as already stated, different thicknesses can be achieved exactly positioned with respect to the tape length. From the flexible rolled sheet blanks are then cut in a conventional manner, which accordingly also the predetermined Have thickness over the length or width. These boards with different thickness profiles are then used according to the invention for a press hardening.
  • the press hardening can be realized by two different methods.
  • the cut boards are austenitized, d. H. subjected to a heat treatment in which austenite conversion takes place depending on the steel.
  • the hot board is inserted into a hot forming tool, formed in the hot forming tool to the component and cooled at the same time.
  • the cooling takes place here with a temperature which is above the critical hardening temperature, so that the curing takes place simultaneously in the forming tool.
  • the hardened formed board leaves the press and can optionally be reworked or is already the final product.
  • mold hardening is performed instead of hot working.
  • the board is cold formed.
  • this cold transformation in all three spatial directions is already complete, as well as the trimming of the edges and the creation of a hole pattern.
  • the board is formed with an undersize of 0.5 to 2% in all three spatial directions and then austenitized.
  • the thermal expansion compensates for the under-forming by 0.5 to 2%, so that after complete heating, the formed blank has its final geometry.
  • This now final geometry or final contour corresponding board is inserted into a mold hardening tool, which also has exactly the contour or geometry of the desired end component.
  • the component is in the mold hardening tool at least in the field of particularly strongly shaped areas held positively, preferably held completely positive fit, cooled and cured by cooling.
  • the component is removed as an end product from the mold hardening tool.
  • austenitization of the boards takes place.
  • the board is heated to about 900 ° to 950 ° C in the preferably used hardenable steels type 22MnB5.
  • different heat profiles or heat treatment profiles also result in the sheet, which ultimately result in different temperatures over the length or width of the board. Since a complete hardening is desired, therefore, the areas with larger sheet thicknesses must at least have the austenitizing temperature. However, this leads to the fact that the thinner areas are virtually overheated.
  • different temperature or heat treatment profiles of the different sheet thickness ranges of the board over the entire treatment process different hardnesses or material properties can arise.
  • the surface of the strip is influenced after galvanizing and before the flexible rolling or after the flexible rolling and cutting in front of the sinker.
  • the surface treatment of the tape can be done in different ways.
  • the aim of the surface treatment is to influence the emissivity or the absorption of heat or heat radiation.
  • a different zinc layer thickness order before rolling can also be avoided and only by the surface treatment quasi-same properties were achieved during annealing.
  • this can be achieved by a matting treatment, a skin pass, d. H. a micro-contouring of the surface, or an additional coating done.
  • the areas which are later thicker after flexible rolling or even after flexible rolling can be given a matted, low-reflecting or dressed surface or be provided with a temporary dark protective lacquer or with a metal oxide surface which provides a particularly good absorption of Thermal radiation and thus a good heating of the thicker areas allows.
  • the same control as for the flexible rolling or the flexible galvanizing is basically used, so that the corresponding areas in their surface condition can be changed precisely and very correctly.
  • the advantage of the invention is that it is possible to flexibly roll hardenable steels, which have to be subjected to a heat treatment for the hardening, and nevertheless to form them with a corrosion protection layer, whereby products having a high homogeneity with respect to the material properties are obtained.
  • sheet metal components can be obtained in a considerably more favorable manner with this method.
  • the invention is not limited to hardenable steels, for example of the type 22MnB5.
  • the flexible galvanizing or galvanizing with flexible layer thicknesses is also applicable to steels that should not undergo further heat treatment, with success.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Metal Rolling (AREA)
  • Electroplating Methods And Accessories (AREA)
EP08707473.8A 2007-03-22 2008-01-31 Verfahren zum flexiblen walzen von beschichteten stahlbändern Active EP2044234B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007013739A DE102007013739B3 (de) 2007-03-22 2007-03-22 Verfahren zum flexiblen Walzen von beschichteten Stahlbändern
PCT/EP2008/000786 WO2008113426A2 (de) 2007-03-22 2008-01-31 Verfahren zum flexiblen walzen von beschichteten stahlbändern

Publications (2)

Publication Number Publication Date
EP2044234A2 EP2044234A2 (de) 2009-04-08
EP2044234B1 true EP2044234B1 (de) 2013-08-28

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EP08707473.8A Active EP2044234B1 (de) 2007-03-22 2008-01-31 Verfahren zum flexiblen walzen von beschichteten stahlbändern

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US (1) US8522586B2 (uk)
EP (1) EP2044234B1 (uk)
JP (1) JP5226017B2 (uk)
DE (1) DE102007013739B3 (uk)
ES (1) ES2431939T3 (uk)
WO (1) WO2008113426A2 (uk)

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JP2010521588A (ja) 2010-06-24
EP2044234A2 (de) 2009-04-08
WO2008113426A2 (de) 2008-09-25
US8522586B2 (en) 2013-09-03
ES2431939T3 (es) 2013-11-28
DE102007013739B3 (de) 2008-09-04
US20110132052A1 (en) 2011-06-09
WO2008113426A3 (de) 2009-03-19
JP5226017B2 (ja) 2013-07-03

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