EP2824216B1 - Verfahren zur Herstellung eines durch Schmelztauchbeschichten mit einer metallischen Schutzschicht versehenen Stahlflachprodukts und Durchlaufofen für eine Schmelztauchbeschichtungsanlage - Google Patents

Verfahren zur Herstellung eines durch Schmelztauchbeschichten mit einer metallischen Schutzschicht versehenen Stahlflachprodukts und Durchlaufofen für eine Schmelztauchbeschichtungsanlage Download PDF

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Publication number
EP2824216B1
EP2824216B1 EP14162799.2A EP14162799A EP2824216B1 EP 2824216 B1 EP2824216 B1 EP 2824216B1 EP 14162799 A EP14162799 A EP 14162799A EP 2824216 B1 EP2824216 B1 EP 2824216B1
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EP
European Patent Office
Prior art keywords
flat steel
steel product
burners
flameless
oxygen
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EP14162799.2A
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German (de)
English (en)
French (fr)
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EP2824216A1 (de
Inventor
Michael Peters
Friedhelm Macherey
Manuela Ruthenberg
Andreas WESTERFELD
Oliver Brehm
Werner Högner
Marc Blumenau
Martin Norden
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel Europe AG
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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
    • C23C2/34—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
    • 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
    • C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
    • C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • C—CHEMISTRY; METALLURGY
    • 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
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
    • C23C28/321—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer with at least one metal alloy layer
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
    • 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
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising
    • C23C8/16—Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide
    • C23C8/18—Oxidising of ferrous surfaces
    • 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
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/80—After-treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/28—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity for treating continuous lengths of work
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/36—Arrangements of heating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • 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

Definitions

  • the invention relates to a process for producing a flat steel product provided by hot dip coating with a metallic protective layer, in particular a high-strength steel flat product having a tensile strength of at least 500 MPa or a high-strength steel flat product having a tensile strength of at least 1000 MPa.
  • the invention further relates to a DFF-type continuous furnace for a hot-dip coating apparatus having a pre-oxidation section in which a flat steel product to be coated is exposed to an oxidizing atmosphere to form a covering FeO layer on the surface of the flat steel product, with burners arranged in the pre-oxidation section are operated with excess oxygen, and wherein at least one of the burner is associated with the top of the flat steel product and at least one of the other burner of the underside of the flat steel product.
  • High-strength and high-strength flat steel products are in demand due to their advantageous combination of strength and formability in increasing quantities. This applies in particular to sheet metal applications in automotive body construction.
  • the outstanding mechanical properties of such flat steel products are based on a multiphase microstructure of the material, possibly supported by induced plasticity of austenitic phase components (TRIP, TWIP or SIP effect).
  • TRIP austenitic phase components
  • the flat steel products in question usually have appreciable contents of certain alloying elements, typically manganese (Mn), aluminum (Al), silicon (Si). or chromium (Cr) count.
  • Mn manganese
  • Al aluminum
  • Si silicon
  • Cr chromium
  • Various methods of applying a metallic protective layer are known. These include electrolytic deposition and hot dip coating. In addition to an electrolytically produced processing, the hot dipping refinement has established itself as an economically and ecologically particularly favorable process. In hot-dip coating, the flat steel product to be coated is immersed in a molten metal bath.
  • Hot dip refinement proves to be particularly cost-effective if a flat-rolled steel semi-finished product delivered in the hard-rolled state is subjected to the process steps of purification, recrystallization annealing, hot dip coating, cooling, optional thermal, mechanical or chemical aftertreatment and coiling.
  • the annealing treatment can be used to activate the steel surface.
  • an N 2 -H 2 -Glühgasatmosphotre typically with unavoidable traces of H 2 O and O 2 is usually maintained in the continuous flow in the annealing furnace.
  • the presence of oxygen in the annealing atmosphere has the disadvantage that the oxygen-affine alloying elements (for example Mn, Al, Si, Cr,...) Contained in the particular steel flat product to be treated form selectively passive, non-wettable oxides on the steel surface, thereby improving the coating quality or adhesion on the steel substrate can be sustainably worsened. Therefore, various attempts have been made to carry out the annealing of high and high strength steels of the type in question so that the selective oxidation of the steel surface is largely suppressed.
  • the oxygen-affine alloying elements for example Mn, Al, Si, Cr,
  • a first method of this kind is from the DE 10 2006 039 307 B3 known.
  • the hot-dip coated steel flat product is bright annealed under particularly reductive atmosphere conditions (low H 2 O / H 2 ratio of the annealing atmosphere and high annealing temperature).
  • Another possibility of preparation of a hot-rolled flat steel product in the course of an annealing treatment is that preoxidations are carried out in a continuous annealing zone used for the annealing within a DFF type ("Direct Fired Furnace") preheating zone.
  • a DFF furnace flames emitted by gas burners act directly on the flat steel product to be treated.
  • the oxidation potential of the atmosphere surrounding the steel flat product is adjusted in such a way that a covering FeO layer forms on the surfaces of the flat steel product.
  • This FeO layer inhibits the selective oxidation of the oxygen-affine alloying elements of the flat steel product.
  • the FeO layer is completely reduced back to metallic iron back.
  • a method approach of this kind has long been from the DE 25 22 485 A1 known.
  • the advantage of preheating the flat steel product in a preheating furnace designed in DFF design consists in addition to the above-mentioned effects that can be achieved particularly high heating rates of the steel strip, which significantly reduces the duration of the annealing cycle and thus coupled with the output of a corresponding continuous furnace Can significantly increase hot dip coating plant.
  • the object of the invention was to provide a continuous furnace or a method of the type mentioned above, in a large-scale hot dip coating plant as uniform as possible pre-oxidation of steel strip, the significant alloying parts of oxygen-affine alloying elements (Mn , Al, Si, Cr, ...), can achieve over the bandwidth. As a result, an improvement of the wetting image and the coating adhesion over the entire width of the steel strip to be achieved.
  • the inventive method is characterized in that as a burner in the pre-oxidation of the preheating furnace flameless burner be used, by means of which fuel, preferably fuel gas, and oxygen-containing gas are introduced separately from each other at a flow rate of at least 60 m / s in the preheating furnace, wherein in addition to at least one of the top of the flat steel product associated flameless burner and at least one of the underside of the flat steel product associated flameless burner per at least one gas line for supplying at least one additional gas stream is provided, by means of which the fuel and the oxygen-containing gas are additionally mixed, and wherein the additional gas stream is directed obliquely to the plane of the flat steel product introduced into the preheating furnace.
  • a uniformly thick oxide layer is reliably produced on the steel strip by the method according to the invention, advantageously, relatively thin pre-oxidation layers of less than 1 ⁇ m, preferably less than 0.3 ⁇ m, in particular less than 0.2 ⁇ m, can be realized.
  • the quality of subsequent hot dip coating in the subsequent process can be significantly improved because of the intermediate reduction step, a clean, free of unwanted alloy oxides band surface is achieved, which has a very good wettability and thus avoids coating defects in the form of uncoated sites or at least significantly reduced.
  • An advantageous embodiment of the method according to the invention is characterized in that the flameless burners are operated with an oxygen excess of at least 1.1, preferably at least 1.2, more preferably at least 1.3.
  • the oxide layer with uniform layer thickness is very reliable, with the nitrogen oxide emissions decrease from a lambda value of about 1.05 with increasing oxygen excess.
  • a further advantageous embodiment of the method according to the invention is characterized in that at least two, preferably at least three flameless burners the top of the flat steel product and at least two, preferably at least three flameless burners are assigned to the bottom of the flat steel product, wherein the top of the flat steel product associated flameless burner in Passing direction of the flat steel product offset to be arranged on the underside of the flat steel product associated flameless burners.
  • This embodiment favors the setting of a homogeneous as possible oxidizing furnace atmosphere, in particular homogeneous temperature distribution.
  • This embodiment also favors the setting of a most homogeneous oxidizing furnace atmosphere.
  • a further advantageous embodiment of the method according to the invention is that the oxygen-containing gas is introduced preheated in the preheating furnace.
  • the oxygen-containing gas typically air
  • the oxygen-containing gas is preheated for this purpose, for example, by means of at least one heat exchanger, which is coupled to the annealing furnace, the cooling device following the annealing furnace and / or the molten bath vessel.
  • a further advantageous embodiment of the method according to the invention provides that the oxygen-containing gas and / or the fuel inert gas, for example, exhaust gas is added.
  • the dimensions of the combustion cloud and in particular the combustion temperature can be influenced in a targeted manner.
  • inert gas and / or exhaust gas preferably preheated inert gas and / or heated exhaust gas for the additional gas flow is used, by means of which the fuel and the oxygen-containing gas are additionally mixed.
  • a further advantageous embodiment of the method according to the invention is characterized in that the dew point of the annealing atmosphere over the entire path of the steel flat product through the annealing furnace between -40 ° C and + 25 ° C is maintained by losses or irregularities by supplying moisture by means of at least one moistening device the distribution of the humidity of the atmosphere can be compensated.
  • the dew point is on the one hand -40 ° C or more to minimize the driving force of the external oxidation of the alloying elements (eg Mn, Al, Si, Cr).
  • the dew point of a maximum of + 25 ° C a unwanted oxidation of iron avoided.
  • the continuous furnace according to the invention is characterized in that at least some of the burners in the pre-oxidation section are designed as flameless burners, by means of which fuel, preferably fuel gas, and oxygen-containing gas can be introduced separately into the preheating furnace at a flow rate of at least 60 m / s at least one flameless burner associated with the upper side of the flat steel product and at least one gas line for supplying at least one additional gas stream are provided adjacent to at least one underside of the flat steel product, the end of the respective gas line being oriented in such a way that the additional emerging therefrom Gas flow crosses or tangent to the emerging from the flameless burner fuel flow and / or oxygen-containing gas stream.
  • the continuous furnace according to the invention offers the advantages already mentioned above in connection with the method according to the invention.
  • hot dip coating plant A has in the conveying direction F of present as steel strip to be coated flat steel product S in direct connection consecutively one for preheating the Stahlflach exercisings S provided DFI booster 1, connected to its input 2 to the DFI booster preheating furnace 3, in which a pre-oxidation section 4 is formed, an annealing furnace 6, which is connected to a transition region 7 to the output 8 of the preheating furnace 3, connected to the output 9 of the annealing furnace 6 cooling zone 10, connected to the cooling zone 10 proboscis 11, to the output 12 of the cooling zone 10 is connected and immersed with its free end in a melt bath 13, a arranged in the melt bath 13 first deflecting means 14, a means 15 for adjusting the thickness of the on the Flat steel product S in the molten bath 13 applied metallic coating and a second deflecting 16 on.
  • the preheating furnace 3 is of the DFF type (Direct Fired Furnace). In it, distributed over the conveyor line of the flat steel product S or at least in the pre-oxidation section 4 a plurality of flameless burners 17 are arranged. In these burners, the fuel (B), preferably fuel gas, and oxygen-containing gas (L), typically air is introduced unmixed or largely unmixed at high flow rate in the preheating furnace 3 (see. Fig. 3 ).
  • the inflow rate of the fuel B and the oxygen-containing gas L is at least 60 m / s, preferably at least 120 m / s.
  • the essential difference to conventional burners in flame operation is the intensive internal recirculation of the exhaust gases AG in the furnace chamber and their mixing with the combustion air or the oxygen-containing gas L (see. Fig. 3 ).
  • the fuel B oxidizes in the entire furnace chamber volume.
  • a very homogeneous temperature distribution arises over the entire width of the flat steel product S.
  • the flameless burners 17 are operated in a superstoichiometric range, i. with a lambda value greater than 1, creating an oxidizing furnace atmosphere.
  • a lambda value of at least 1.05, particularly preferably at least 1.1, in particular at least 1.2 or at least 1.3 is set.
  • FIG Fig. 2 The structure of a flameless burner 17 for use in a continuous furnace (preheating furnace) 3 of the DFF type for a hot-dip coating machine is shown in FIG Fig. 2 shown.
  • the burner 17 has a pipe section 17.1 with an elongated gas nozzle 17.2.
  • the pipe section 17.1 is provided with a connecting flange 17.3 and connected via a fuel gas line, not shown, to a fuel gas supply, also not shown.
  • the burner 17 has a hollow chamber 17.4 for supplying oxygen-containing gas, preferably air, which surrounds a longitudinal section of the pipe section 17.1 with the fuel gas nozzle 17.2.
  • the hollow chamber 17.4 is provided with a connecting flange 17.5 and connected via a supply line, not shown, to a likewise not shown oxygen or air supply.
  • the gas nozzle 17.2 opens with a central opening 17.6 and a coaxial annular opening (ring nozzle) 17.7 in the preheating furnace 3. Further, in the furnace chamber facing end face of the burner 17, an annular nozzle or more arranged on a common pitch circle, preferably evenly spaced from each other Nozzles 17.8 provided for the supply of oxygen or air.
  • the oxygen or air nozzles 17.8 are designed so that the oxygen or air jets emerging therefrom cross the fuel gas stream leaving the gas nozzle.
  • the burner 17 On its front side, the burner 17 is also provided with a nozzle stone 17.9.
  • the nozzle block 17.9 has a channel 17.10, into which the nozzles 17.2, 17.6, 17.7, 17.8 open.
  • the nozzle block 17.9 is provided with a pilot burner 17.11, which is received in a smaller, branched off from the channel 17.10 transverse channel 17.12. 17.
  • the nozzle block 17.9 has a plurality of jet pipes (so-called jet pipes) 17.13 for the supply of oxygen-containing gas, which are connected to the hollow chamber 17.4 and whose longitudinal axes extend substantially parallel to the fuel inflow direction defined by the fuel gas nozzle 17.2.
  • each of the flameless burners 17 has three or more of these jet pipes 17, 13 equally spaced on a channel 17.10 surrounding pitch are arranged.
  • the nozzle block 17.9 is inserted in a form-fitting manner in a burner block 3.1 having a passage opening.
  • the burner block 3.1 is provided with a gas line 5 for supplying an additional gas flow ZG.
  • the end opening into the preheating furnace 3 (jet pipe) of the gas line 5 is oriented such that the additional gas flow ZG the fuel stream B emerging from the flameless burner 17 and oxygen-containing gas stream L crosses or tangent.
  • the burner air L required for the combustion or the oxygen supplied for the combustion is preferably preheated.
  • the respective flameless burner 17 may be preceded by a device (not shown here) for heating the oxygen-containing gas or the burner air L.
  • the fuel gas supply line can also be provided with a device (not shown here) for heating the fuel gas B.
  • the additional jet pipe 5 or the gas line connected thereto for supplying the at least one additional gas stream ZG can be preceded by a device (not shown here) for heating the additional gas stream.
  • an inert gas or exhaust pipe is connected to the connected to the respective connecting flange 17.3 or 17.5 supply line (feed), which is provided with a metering valve (control valve).
  • the flameless burners 17 are preferably integrated in at least one of the side walls 3.2, 3.3 of the preheating furnace 3, wherein at least two, preferably at least three flameless burners 17 the top of the flat steel product S and at least two, preferably at least three flameless burners 17 associated with the bottom of the flat steel product S. are.
  • the flameless burners 17 are preferably arranged offset from one another (cf. Fig. 1 ).
  • the flameless burners assigned to the upper side of the flat steel product S can be arranged offset in the direction of passage of the flat steel product S to the flameless burners associated with the underside of the flat steel product S.
  • jet pipes (jet pipes) 17.13 which are arranged with respect to the Brenngaseinströmstrahl and the channel 17.10 at a distance, and is injected via the additionally oxygen-containing gas L, preferably oxygen or air in the fuel gas stream B, already a homogenization the fuel gas distribution causes.
  • oxygen-containing gas L preferably oxygen or air in the fuel gas stream B
  • gas line 5 is preferably introduced inert gas and / or exhaust gas in the pre-oxidation.
  • This additional gas flow ZG crosses or touches the fuel flow.
  • FIGS. 3 and 4 shown schematically.
  • Fig. 4 is the above the flat steel product S arranged flameless burner 17, which is arranged in the side wall 3.2 of the preheating furnace 3, combined with a jet pipe 5.
  • This jet tube 5 is above or (not shown here) preferably laterally adjacent to the flameless one Burner 17 is arranged and in each case aligned so that the emerging therefrom additional gas flow ZG crossed by the flameless burner 17 introduced fuel flow B or tangent. Furthermore, the flameless burner 17 arranged below the flat steel product S, which is arranged in the side wall 3.3 of the preheating furnace, is also combined with a jet pipe 5. This jet pipe 5 is arranged below or (not shown here) preferably laterally next to the flameless burner 17 and in each case aligned so that the additional gas flow ZG emerging therefrom crosses or touches the fuel flow B introduced by means of the flameless burner 17. This combination of flameless burner 17 and jet pipe 5 delimits the transition to the flameless zone in the preheating furnace.
  • a device not shown in detail for the targeted feeding of oxygen or air is provided in the transition region 7.
  • the purpose of this feed is the setting of hydrogen, which possibly passes in the transition region 7 as a result of flowing in the annealing furnace 6 from the outlet 9 in the direction of its inlet gas flow G.
  • a suction device 24 is arranged in the region of the entrance of the annealing furnace 6, which sucks the reaching to the entrance of the annealing gas flow G.
  • two moistening devices 25, 26 Adjacent to the outlet 9 of the annealing furnace 6, two moistening devices 25, 26 are arranged, one of which is assigned to one of the upper side and the other of the underside of the flat steel product S to be coated.
  • the moistening devices 25, 26 are designed as slotted or perforated tubes oriented transversely to the conveying direction F of the flat steel product S and connected to a supply line 27, via which the moistening devices 25, 26 with steam or a moistened carrier gas, such as N 2 or N 2 /. H 2 , to be supplied.
  • the cooling zone 10 may be designed so that the cooled to the respective bath inlet temperature flat steel product S before its entry into the trunk 11 yet in the cooling zone 10 undergoes an overaging treatment at the bath inlet temperature.
  • the flat steel product S is deflected at the first deflection device 14 in the vertical direction and passes through the device 15 for adjusting the thickness of the metallic protective layer. Subsequently, the steel flat product S provided with the metallic protective layer is deflected again in the horizontal conveying direction F at the second deflection device 16 and, if appropriate, subjected to further treatment steps in plant parts not shown here.
  • a hot-dip coated flat steel product according to the invention is excellently suited for further processing by means of one-stage, two-stage or multi-stage cold or hot forming into a high-strength / high-strength sheet metal component.
  • a sheet metal component continues to be distinguished by its particular resistance to environmental influences.
  • the use of a hot-dip coated steel flat product according to the invention thus not only raises lightweight potential, but also prolongs the product life.
  • the method according to the invention achieves a very homogeneous pre-oxidation of a steel strip to be provided with a metallic protective layer by hot-dip coating, over the entire bandwidth in a large-scale DFF preheating furnace. This results in an improvement of the wetting pattern and the coating adhesion over the entire width of the flat steel product. Coating defects at the strip edges can thus be avoided even with relatively wide insert strips.
  • Another advantage lies in the optimized combustion, which differs significantly characterized by reduced pollutant emissions and reduced fuel consumption.

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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)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP14162799.2A 2013-05-24 2014-03-31 Verfahren zur Herstellung eines durch Schmelztauchbeschichten mit einer metallischen Schutzschicht versehenen Stahlflachprodukts und Durchlaufofen für eine Schmelztauchbeschichtungsanlage Active EP2824216B1 (de)

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KR101836714B1 (ko) * 2016-10-12 2018-03-09 현대자동차주식회사 고망간강
DE102018102624A1 (de) 2018-02-06 2019-08-08 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung eines Stahlbandes mit verbesserter Haftung metallischer Schmelztauchüberzüge
DE102019108459B4 (de) 2019-04-01 2021-02-18 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung eines Stahlbandes mit verbesserter Haftung metallischer Schmelztauchüberzüge
DE102019108457B4 (de) 2019-04-01 2021-02-04 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung eines Stahlbandes mit verbesserter Haftung metallischer Schmelztauchüberzüge
IT202000013285A1 (it) * 2020-06-04 2021-12-04 Danieli Off Mecc Procedimento e apparato per il riscaldo di prodotti siderurgici
CN111549307A (zh) * 2020-06-15 2020-08-18 华菱安赛乐米塔尔汽车板有限公司 一种热浸镀铝硅钢板的生产工艺
CN111780106B (zh) * 2020-06-30 2022-07-12 武汉钢铁有限公司 轧钢加热炉无焰燃烧器及其应用
WO2022064149A1 (fr) * 2020-09-23 2022-03-31 Fives Stein Section de prechauffage a flamme directe pour ligne continue de traitement de bandes metalliques
FR3114324B1 (fr) * 2020-09-23 2022-12-16 Fives Stein Section de prechauffage a flamme directe pour ligne continue de traitement de bandes metalliques

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