EP3686534B1 - Procédé et four pour le traitement thermique d'une bande d acier de haute résistance comprenant une chambre d homogénéisation en température - Google Patents

Procédé et four pour le traitement thermique d'une bande d acier de haute résistance comprenant une chambre d homogénéisation en température Download PDF

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Publication number
EP3686534B1
EP3686534B1 EP19218200.4A EP19218200A EP3686534B1 EP 3686534 B1 EP3686534 B1 EP 3686534B1 EP 19218200 A EP19218200 A EP 19218200A EP 3686534 B1 EP3686534 B1 EP 3686534B1
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Prior art keywords
strip
temperature
chamber
oxidation
radiant heating
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EP19218200.4A
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German (de)
English (en)
French (fr)
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EP3686534A1 (fr
Inventor
Jean-Pierre Crutzen
Lutz Kümmel
Frank Maschler
Michel Renard
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Drever International SA
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Drever International SA
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • 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
    • 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
    • C21D1/26—Methods of annealing
    • 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
    • C21D1/34—Methods of heating
    • 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
    • C21D1/34—Methods of heating
    • C21D1/52—Methods of heating with flames
    • 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
    • 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
    • C21D1/76—Adjusting the composition of the atmosphere
    • 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
    • C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
    • 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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • 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
    • C21D9/563—Rolls; Drums; Roll arrangements
    • 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
    • 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

Definitions

  • the invention relates to a process for the heat treatment of a high strength steel strip.
  • the invention relates to a furnace for the heat treatment of a high resistance steel strip.
  • High strength steels include alloying elements, for example manganese, silicon, chromium and / or aluminum.
  • alloying elements for example manganese, silicon, chromium and / or aluminum.
  • the alloying elements present in high strength steel can diffuse towards the surface of the steel and oxidize rapidly because of their high affinity for oxygen, even in areas with radiant tubes where the atmosphere is nevertheless reducing for iron oxides.
  • This selective oxidation creates surface defects which make it difficult to adhere the zinc coating (or other metal or alloy) applied when galvanizing the surface. This problem of wettability is a limiting aspect of galvanizing which cannot be carried out correctly.
  • a particularly studied method consists in subjecting, in the annealing furnace, the surface of the strips to temperature and atmospheric conditions suitable for rapidly and deeply oxidizing the alloying elements and thus preventing their surface migration. During this operation, an iron oxide layer is formed which will subsequently be removed in subsequent zones of the annealing furnace under a reducing atmosphere.
  • the documents US 2017/137906 A1 and KR 20160085830 A describe an oxidation of a metal strip as it passes through a direct flame heating section with an excess of oxygen in the combustion atmosphere.
  • the documents US 2010/173072 A1 and KR 20160085830 A describe the oxidation of a metal strip with injection of an oxidant during its passage through a radiant tube heating section.
  • a problem generally encountered during the heat treatment of metal products with oxidation and reduction of the surface is to obtain a non-homogeneous surface state before the galvanizing step.
  • one of the aims of the present invention is to provide a method of heat treatment of a high resistance steel strip making it possible to obtain on its surface an oxide formation with a more homogeneous and more controlled thickness. .
  • the method of the invention allows during the heat treatment, thanks to the temperature homogenization step, the oxidation of the strip presenting a more homogeneous surface in temperature. This allows growth of an oxide layer having a more homogeneous thickness over the entire strip surface. A more homogeneous oxide thickness at the surface of the strip makes it possible to have a subsequent reduction of said oxide layer better controlled. Indeed, variations in the thickness of the oxide layer formed during the oxidation step require an adaptation of the reduction time during the reduction step in order to reduce the oxide over the entire surface. strip surface. Such an adaptation of the reduction time is based on the greatest oxide thicknesses. The method of the invention allows better control of the time of the reduction step because it guarantees a more homogeneous oxide thickness on the strip surface.
  • the method of the invention is particularly advantageous because it makes it possible to compensate for the temperature inhomogeneity of the strip, in particular of the surface of the strip during step a) of heating the strip by direct flame.
  • a direct flame heating zone allows a rapid rise in temperature of the strip to the detriment of the temperature homogeneity of the metal product.
  • the oxidation chamber is positioned directly after the direct flame heating zone, so that the oxidation is carried out on a strip whose temperature homogeneity is not well controlled.
  • step a) An oxidation carried out during heating by direct flame (step a)) makes an adjustment of the thickness of the FeO layer formed very difficult to control. Indeed, in EP 2 010 690 A1 , it was found that for the same oxidizing conditions in the atmosphere during heating by direct flame, a high scroll speed shows a thinner FeO layer compared to lower scroll speeds, demonstrating the high sensitivity from the iron oxide formation process to the various parameters involved.
  • An advantage of the process of the invention over processes where the oxidation is carried out at the same time as the heating of the strip in a direct flame heating zone is that the process of the invention makes it possible to dissociate the heating of the strip. the strip, temperature homogenization and its oxidation with separate stages and furnace chambers. This allows better control of the iron oxide formation parameters at the surface of the strip while allowing strip heating by direct flame.
  • the invention makes it possible to overcome the drawbacks of heating by direct flame by introducing a temperature homogenization chamber. Thanks to the invention, it is therefore possible to have an oven exhibiting a very good quality of heat treatment, as well as a better surface condition of the strip before it is galvanized, and this for reasonable operating costs.
  • oxygen concentration (volume) should be understood to mean an O 2 (volume) concentration.
  • the steps of the process of the invention are to be carried out in the following order: step a), step b), step c), and step d).
  • the reduction zone has a reducing atmosphere having a hydrogen volume concentration greater than 3% and of preferably greater than 5%, and even more preferably greater than 8%.
  • An advantage associated with such volume hydrogen concentrations in the reduction zone for these preferred embodiments is to increase the assurance that reduction will take place.
  • the remainder of the composition of the atmosphere of the reduction zone comprises nitrogen.
  • the process of the invention is particularly effective for high strength steel strips, for example having a Cr composition by weight of less than 5%, preferably less than 3% and even more preferably less. at 1%.
  • high strength steel is understood to mean a steel comprising alloying elements such as manganese, silicon, chromium and / or aluminum.
  • the strip has a thickness between 0.3 mm and 3.2 mm.
  • the homogenization chamber comprising at least one radiant heating tube is intended to allow standardization / homogenization of the temperature of the strip when the latter is present in the homogenization chamber.
  • the temperature uniformization of the strip takes place gradually during its passage through the homogenization chamber in order to obtain a temperature that is as uniform as possible at the outlet of the homogenization chamber.
  • the homogenization chamber is not primarily intended to vary the average temperature of the strip but rather is intended to make the temperature of the strip uniform.
  • the homogenization chamber may be present radiant and / or heating elements which have a power that can be changed quickly, which makes it possible to adjust the temperature quickly so as to maintain an optimum temperature at the entrance to the chamber. oxidation and ensure regular oxidation of the surface of the steel strip.
  • the temperature homogenization chamber comprises two, three, or four radiant heating tubes.
  • the temperature of the strip is included in the present application as being a temperature measured at the surface of the strip and representing the temperature over the entire thickness of the strip.
  • a temperature of the strip at a point of the strip at its surface is representative of the temperature throughout the thickness of the strip. This is particularly true when the strip is in a chamber that is substantially homogeneous in temperature.
  • a homogeneity or an inhomogeneity of temperature can be characterized by measurements of the surface temperature of the strip at very distinct places.
  • a temperature inhomogeneity is observed on a strip section when there is a temperature difference greater than 5%, preferably greater than 2% and even more preferably greater than 1% between a point located at the center of the strip. and a point on the edge of the strip.
  • the strip temperature is for example an average strip temperature taken on a section of strip at several different points, for example the strip temperature is the average of the temperatures measured at the level of the two edges as well as at its center.
  • a target band temperature is reached when the average band temperature and the target band temperature are equal or in any case have a deviation of less than 2%, preferably less than 1%.
  • the strip temperature remains essentially the same but it is surface homogenized.
  • the oxidizing atmosphere in the oxidation chamber has a volume oxygen concentration of between 1.5% and 5% and even more preferably between 2% and 5%.
  • the oxidation chamber of the invention does not include a radiant heating tube inside thereof.
  • the oxidation chamber is confined, for example insulated within a radiant heating furnace section so that it is indirectly heated by the radiant heating tubes of the radiant heating furnace section.
  • Direct flame heating is used to clean high strength steel strip (eg degreasing).
  • the cleaning makes it possible in particular to remove organic residues present on the surface of the steel strip.
  • the oxidation step is carried out at a strip temperature of between 650 ° C and 750 ° C.
  • a strip temperature of between 650 ° C and 750 ° C allows good control of the oxidation kinetics of the strip surface during its passage in an oxidation chamber in which the volume oxygen concentration is greater than 1% .
  • the volume concentration of oxygen in the oxidation chamber is between 1.5% and 5% and even more preferably between 2% and 5%. Control of the homogeneity of the oxidation kinetics is ensured by passing the strip through the homogenization chamber.
  • volume oxygen concentration values in the oxidation chamber of between 1.5% and 5% and even more preferably between 2% and 5% allow an oxidation step which is not. or little influenced by any gas leaks, without generating an excessively thick layer of iron oxide.
  • the duration of exposure of said steel strip in the oxidation chamber is between 2 and 8 seconds, preferably ranging from 2 to 4 seconds.
  • the oxidation step is carried out in a confined or relatively confined manner in the oxidation chamber.
  • RTF Radiant Tubes Furnaces
  • the oxidation step is homogeneous in that it allows homogeneous oxidation at the surface of said steel strip.
  • the oxidation step is carried out by propelling an oxidizing gas by means of a carrier gas, preferably nitrogen.
  • a carrier gas preferably nitrogen.
  • the method according to the invention comprises the application of a pressure inside said oxidation chamber and in the rest of the furnace, said pressures being substantially equal.
  • the process according to the invention makes it possible to maintain an easily controllable oxidation which avoids the disturbances caused by the atmosphere which surrounds the oxidation chamber.
  • the heating step a), the temperature homogenization step b) as well as the reduction step d) are carried out with a reducing atmosphere having a volume concentration of hydrogen greater than 3%.
  • the reducing atmosphere in the reduction zone has an atmosphere having a hydrogen concentration of between 3% and 5%.
  • the reduction zone has a composition comprising a hydrogen concentration of between 3% and 5%, the remainder of the composition comprising nitrogen.
  • the temperature homogenization step is carried out at a strip temperature of between 650 ° C and 750 ° C.
  • such a temperature range allows good control of the kinetics of oxide formation in the oxidation chamber, that is to say in the presence of a volume concentration of oxygen generally between 1% and 5. %.
  • it is particularly advantageous to homogenize the strip temperature at a target temperature. Homogenization at a target temperature means that there is a supply of heat at the strip strictly equal to the heat lost by the strip.
  • the homogenization is carried out with an essentially zero heat input / loss balance so as to prevent the introduction of other temperature inhomogeneities to the strip.
  • step a) of heating is carried out so as to obtain a strip temperature of between 650 ° C and 750 ° C.
  • step a) is carried out under reducing condition in the presence of carbon monoxide and hydrogen.
  • Such conditions are generated by using a non-stoichiometric fuel / oxidizer mixture which is particularly poor in oxygen.
  • the temperature homogenization step is carried out with an atmosphere having an oxygen volume concentration of less than 0.01% by volume, preferably with an oxygen-free atmosphere.
  • the temperature homogenization step is carried out in a chamber adjacent to the oxidation chamber, the atmosphere in the homogenization chamber can be kept poor, or even very poor, in oxygen. This can be made possible according to a preferred embodiment, by the presence of confinement means positioned between the oxidation chamber and the homogenization chamber, for example by using an airlock.
  • Such containment means may be particularly desired because large or poorly controlled gas passages between the oxidation chamber and the reduction zone and / or the temperature homogenization chamber, can cause harmful gas exchanges between the different oven chambers.
  • oxygen escapes from the oxidation chamber to a chamber under a reducing atmosphere, the water vapor content increases in this zone. Then, the increase in the water vapor content influences the dew point and can give rise to unwanted oxidation phenomena, such as for example the oxidation of alloy compounds on the surface of the steel.
  • these alloying compounds have a high affinity for oxygen, and their selective oxidation has a deleterious influence on the adhesion of the coating obtained after galvanization.
  • the volume concentration of oxygen in the oxidation chamber can represent a volume concentration which is particularly sensitive to unwanted gas exchanges. with adjacent rooms.
  • Step a) of heating is carried out with an atmosphere having an oxygen volume concentration of less than 0.01% by volume, preferably with an oxygen-free atmosphere.
  • the temperature homogenization step is carried out by the movement of the strip near said at least one radiant heating tube.
  • the advantage of running the strip near a radiant heating tube is that it allows a well-controlled amount of heat to be supplied to the strip over the entire width of the strip.
  • the movement of the strip near the radiant heating tube allows heat exchange between the strip and the radiant heating tube.
  • This makes it possible to maintain the strip at a temperature, for example at the target temperature, while allowing homogenization of the temperature of the strip.
  • the invention thus makes it possible to benefit from the advantages of heating by direct flame while compensating for the drawbacks associated with heating by direct flame (inhomogeneity of strip temperature).
  • the strip runs at a distance from a radiant heating tube of between 0.1 m and 0.2 m.
  • said homogenization section comprises at least two radiant heating tubes.
  • the metal product passes between said two radiant heating tubes.
  • the movement of the steel strip in front of two radiant heating tubes allows an improvement in the temperature uniformity of the steel strip by allowing more time for the steel strip to equilibrate in temperature while receiving a amount of heat from the radiant heating tubes to maintain a target band temperature.
  • the target band temperature is generally between 650 ° C and 750 ° C and corresponds to a temperature at which the oxidation of the band in the oxidation chamber is well controlled. The same reasoning can be applied for three, four, six radiant heating tubes.
  • the heating of the strip in step a) is carried out until a target strip temperature of between 650 ° C and 750 ° C is reached, and the temperature homogenization of the strip in step b) is reached. is produced so as to homogenize the temperature of the strip according to said temperature target.
  • the homogenization step of step b) makes it possible to maintain the strip at the target temperature.
  • the heat communicated by the radiant heating tube (s) to the strip has the sole purpose of maintaining the temperature of the strip according to the target temperature as well as of homogenizing the temperature of the strip. this.
  • the radiant heating tubes during the temperature homogenization step radiate uniformly towards the strip, allowing good temperature homogenization of the strip, at the surface as well as according to the thickness of the strip.
  • the temperature homogenization chamber is positioned between the direct flame heating zone and the oxidation chamber.
  • a radiant heated furnace section is an RTF.
  • the homogenization chamber is located in the radiant heating furnace section, as is the oxidation chamber.
  • said homogenization chamber comprises at least two radiant heating tubes and even more preferably at least three radiant heating tubes.
  • the number of radiant heating tubes in the homogenization chamber makes it possible to define its length, along which the strip can equilibrate in temperature while remaining at the target strip temperature.
  • the number of radiant heating tubes and the length of the temperature homogenization chamber depend on the direct flame heating zone and the temperature inhomogeneity of the strip which emerges from it as well as the desired temperature homogeneity of the strip in the oxidation chamber.
  • the number of radiant tubes and the length of the homogenization chamber can also depend on the target temperature at the outlet of the homogenization chamber.
  • the metallic product is positioned scrolling between at least two radiant heating tubes.
  • Such an embodiment allows better homogenization of the temperature of the strip as described for the process according to the first aspect of the invention.
  • the furnace further comprises a first and a second rollers for guiding the moving web, the first roll being positioned downstream of the direct flame heating zone and the second roll being positioned downstream of the oxidation chamber.
  • the strip is preferably kept under tension in the homogenization chamber so that when moving, said strip describes an essentially rectilinear path as it passes through the homogenization chamber and into the reduction zone.
  • the first and second rollers are positioned so that said metal strip is stretched in a substantially vertical orientation between said rollers.
  • An essentially vertical strip orientation corresponds to a strip orientation with respect to a flat ground describing an angle with the normal to the flat ground between 0 ° and 15 °.
  • the strip is under tension in the oven so that it is stretched as it passes through the homogenization chamber and then into the oxidation chamber.
  • the furnace is configured such that the metal strip is stretched in a substantially horizontal orientation.
  • the oxidation chamber is further delimited by two locks which are each formed by at least two lock rollers.
  • two locks which are each formed by at least two lock rollers.
  • the oxidation chamber is confined from the homogenization chamber and from the reduction zone by two confinement means allowing the strip to travel through said oxidation chamber, for example the two confinement means are two locks.
  • the oxidation chamber is provided with vents in order to balance the incoming and outgoing volumes to balance the pressure inside the chamber and also to reduce the possible transfers of gas by leaks.
  • the figure 1 shows a schematic illustration of the oven 1 according to the second aspect of the invention making it possible to implement the method according to the first aspect of the invention.
  • the furnace 1 comprises in the direction of travel of the strip 5, a direct flame heating zone 10, a temperature homogenization chamber 20, an oxidation chamber 30 and a reduction zone 40 for the reduction of the temperature. oxide and heat treatment of the tape.
  • the furnace 1 comprises a direct heating furnace section 2 comprising the direct flame heating zone 10 and a radiant heating furnace section 3 comprising the temperature homogenization chamber 20, the oxidation chamber 30 and the heating zone. reduction 40.
  • the method according to the invention comprises the implementation of step a) of heating the strip 5 by direct flame in the direct flame heating zone 10.
  • the method then comprises the implementation of step b) , that is to say the movement of the strip 5 near at least one radiant heating tube 25 so, for example, to allow time for the strip 5 preheated to a target temperature, to homogenize in temperature while maintaining said target temperature.
  • the strip 5 can be heated in the homogenization chamber 20 so as to have an outlet (homogenized) temperature higher than the inlet temperature.
  • the method then comprises the implementation of the oxidation step c), that is to say the movement of the strip 5 in the oxidation chamber 30 comprising a volume concentration of oxygen greater than 1% and preferably between 1.5% and 5%.
  • step c) an oxide layer forms on the surface of the strip 5.
  • the oxide formed is essentially iron II, II-III or III oxide in general.
  • the method of heat treatment of a steel strip 5 comprises after step c), step d) during which, the steel strip 5 oxidized in step c) undergoes a heat treatment at a temperature of band up to 800 ° C and preferably up to 850 ° C.
  • the strip 5 is subjected to a reducing atmosphere preferably comprising a volume concentration of hydrogen greater than 3%, and more preferably between 3% and 5%.
  • the remaining volume fraction being nitrogen in general.
  • the temperature of the heat treatment in the reduction zone during step d) can be changed relatively easily without, however, steps a), b) and c) being changed significantly.
  • the figure 2 shows an overall view of a furnace 1 according to the second aspect of the invention, with a schematic representation of the path of the strip 5 through the direct flame heating zone 10, the homogenization chamber 20, the chamber of oxidation 30 and the reduction zone 40 included in the furnace 1.
  • the strip 5 describes a succession of vertical passes during which it passes through the direct heating furnace section 2 then the radiant heating furnace section 3 After having passed through the direct flame heating zone 10, the strip 5 enters the radiant heating furnace section 3 through the homogenization chamber 20.
  • the direct flame heating zone 10 comprises two pass lines. Then the strip 5 is directed towards the temperature homogenization chamber 20.
  • the pass line comprising the temperature homogenization chamber 20 and the oxidation chamber 30 is located in the RTF section (radiant heating furnace section) of furnace 1.
  • the oxidation chamber 30 is at a similar temperature. of the RTF section which surrounds it while being preferably isolated in terms of the oxygen and hydrogen content.
  • the reduction zone 40 comprises a series of vertical passes surrounded by radiant heating tubes 25 allowing adjustment of the temperature of the strip 5 in order to achieve the desired heat treatment of the high strength steel strip 5.
  • the figure 3 shows a schematic view of the feed of the strip 5 to the temperature homogenization chamber 20, then to the oxidation chamber 30 and the path of the strip 5 to the reduction zone 40.
  • the figure 3 shows a particular embodiment of the chamber temperature homogenization 20 which exemplarily illustrates three radiant heating tubes 25 arranged so that the strip 5 passes close by as it travels through the temperature homogenization chamber 20.
  • the temperature homogenization chamber 20 illustrated allows good homogenization of the temperature of the strip 5 at a target temperature, the target temperature being defined as a function of the composition of the steel. Thus a precisely defined and homogeneous oxide thickness over the entire surface of the strip 5 can be obtained.
  • a strip of steel is fed into a direct flame heating zone 10 and is heated under a reducing condition in the presence of carbon monoxide and hydrogen, preferably so as to reach a strip temperature. between 650 to 750 ° C.
  • the steel strip is then fed to the oxidation chamber 30 which is confined in the section of the radiant heating furnace (RTF), where the oxidation takes place with an oxygen content greater than 1%.
  • RTF radiant heating furnace
  • This oxidation step allows the formation at the surface of a layer of iron oxide, for example.
  • the oxide layer is removed during the heat treatment step in a reducing atmosphere in order to proceed with the galvanizing step according to a method well known to those skilled in the art.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
EP19218200.4A 2019-01-23 2019-12-19 Procédé et four pour le traitement thermique d'une bande d acier de haute résistance comprenant une chambre d homogénéisation en température Active EP3686534B1 (fr)

Priority Applications (1)

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SI201930065T SI3686534T1 (sl) 2019-01-23 2019-12-19 Postopek in peč za toplotno obdelavo visoko odpornega jeklenega traku, vključno s temperaturno komoro za homogenizacijo

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BE20195038A BE1026986B1 (fr) 2019-01-23 2019-01-23 Procédé et four pour le traitement thermique d’une bande d’acier de haute résistance comprenant une chambre d’homogénéisation en température

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EP (1) EP3686534B1 (zh)
KR (1) KR20200092253A (zh)
CN (1) CN111471847B (zh)
BE (1) BE1026986B1 (zh)
BR (1) BR102020001356A2 (zh)
ES (1) ES2874752T3 (zh)
MX (1) MX2019015493A (zh)
RU (1) RU2766264C2 (zh)
SI (1) SI3686534T1 (zh)

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EP4303516A1 (en) 2022-07-05 2024-01-10 John Cockerill S.A. Device for improving preoxidation in an annealing furnace

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US20240102124A1 (en) 2024-03-28
RU2766264C2 (ru) 2022-02-10
BE1026986A1 (fr) 2020-08-17
EP3686534A1 (fr) 2020-07-29
BR102020001356A2 (pt) 2020-08-04
RU2019142708A (ru) 2021-06-21
RU2019142708A3 (zh) 2021-12-09
ES2874752T3 (es) 2021-11-05
CN111471847B (zh) 2023-10-31
MX2019015493A (es) 2020-07-28
CN111471847A (zh) 2020-07-31
US20200232063A1 (en) 2020-07-23
BE1026986B1 (fr) 2020-08-25
SI3686534T1 (sl) 2021-07-30
KR20200092253A (ko) 2020-08-03

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