EP2188399B1 - Controlled method and device for oxidation/reduction of the surface of a steel strip running continuously through a radiant tube oven for galvanisation thereof - Google Patents
Controlled method and device for oxidation/reduction of the surface of a steel strip running continuously through a radiant tube oven for galvanisation thereof Download PDFInfo
- Publication number
- EP2188399B1 EP2188399B1 EP08829848.4A EP08829848A EP2188399B1 EP 2188399 B1 EP2188399 B1 EP 2188399B1 EP 08829848 A EP08829848 A EP 08829848A EP 2188399 B1 EP2188399 B1 EP 2188399B1
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- EP
- European Patent Office
- Prior art keywords
- shaped
- tube
- medium
- oxidation
- oxidising
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims description 35
- 239000010959 steel Substances 0.000 title claims description 35
- 238000007254 oxidation reaction Methods 0.000 title claims description 32
- 230000003647 oxidation Effects 0.000 title claims description 31
- 238000000034 method Methods 0.000 title claims description 12
- 230000009467 reduction Effects 0.000 title description 8
- 239000000203 mixture Substances 0.000 claims description 27
- 238000000137 annealing Methods 0.000 claims description 17
- 238000005246 galvanizing Methods 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 13
- 239000001301 oxygen Substances 0.000 claims description 13
- 229910052760 oxygen Inorganic materials 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 10
- 239000000446 fuel Substances 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 239000000567 combustion gas Substances 0.000 claims 3
- 229910000851 Alloy steel Inorganic materials 0.000 claims 1
- 239000004411 aluminium Substances 0.000 claims 1
- 230000001590 oxidative effect Effects 0.000 description 20
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 13
- 239000011701 zinc Substances 0.000 description 13
- 229910052725 zinc Inorganic materials 0.000 description 13
- 239000003546 flue gas Substances 0.000 description 8
- 238000005275 alloying Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 235000021183 entrée Nutrition 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 208000036765 Squamous cell carcinoma of the esophagus Diseases 0.000 description 1
- 241001080024 Telles Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004320 controlled atmosphere Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 208000007276 esophageal squamous cell carcinoma Diseases 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
Images
Classifications
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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
- C21D1/74—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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
-
- 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
- C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
-
- 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
- F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
- F27B9/068—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated heated by radiant tubes, the tube being heated by a hot medium, e.g. hot gases
-
- 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 the continuous galvanizing of steel strips including AHSS high levels of silicon, manganese, aluminum and, in particular, facilities comprising a radiant tube furnace without direct flame heating zone.
- the patent JP 02-285057 describes an oxidation phase between 400 and 700 ° C in a slightly oxidizing atmosphere and then a reduction phase between 600 and 800 ° C in a reducing atmosphere, it indicates ranges of temperature and the composition of the gases (contents of O 2 , N 2 and H 2 ).
- the patent EP 1 285 972 describes the same principle. These two patents, however, remain very general and do not clearly reveal the practical means of controlling reactions.
- the patent EP 1 457 580 describes an installation for performing the oxidation phase in a specific chamber where the strip is heated by induction or combustion of a gas, in an oxidizing atmosphere, between 100 and 400 ° C.
- the patent US 3,936,543 describes an annealing furnace duct not aimed at the specific coating of AHSS steels but making it possible to avoid the use of cleaning flux during galvanization by the oxidation followed by the superficial reduction of carbon steel strips.
- the oven Annealing prior to the galvanizing bath is a conventional furnace having a direct flame heating zone (FDF) and a radiant tube temperature holding zone (RTF).
- FDF direct flame heating zone
- RTF radiant tube temperature holding zone
- the surface oxidation is obtained in the DFF zone by controlling the combustion under super-stoichiometric conditions so that the flue gases have a controlled excess of oxygen.
- the reduction is obtained in the RTF zone which comprises at least 5% hydrogen, the remainder being nitrogen.
- the principle laid down by this patent can be implemented for the controlled oxidation / reduction of AHSS steels. It has the advantage of not requiring any additional oxidation installations and of using the mixed galvanization furnaces DFF / RTF without major modifications.
- the patent WO 2005/017214 proposes two possibilities to solve the problem. The first is to use a direct flame combustion chamber separate from the RTF annealing furnace from which the flue gas has been collected for injection into the furnace. The second is to install a direct flame burner in an area of the oven enclosure. In both cases, the flue gases provide the necessary oxidizing atmosphere under conditions of composition obviously dependent on the temperature of the strip and that of the gases. The reduction is then conventionally obtained by passing through a mixture of nitrogen and hydrogen.
- the invention consists in injecting an oxidizing medium into a section of a radiant tube furnace, particularly in a nitrogen / hydrogen atmosphere, using one or more tubes, in particular specially modified and capable of being installed in place of any of the existing tubes.
- this injection can be carried out in any section of the furnace, preferably in the preheating section.
- the medium must have, depending on the temperature of the band and the chemical composition of the latter, a dew point such that the alloying elements such as silicon, manganese, aluminum, chromium are deeply oxidized. and no longer have the ability to migrate to the surface. As a general rule, this dew point is above -20 ° C.
- the injected medium may be water vapor or air or a mixture rich in oxygen. It can also be the product resulting from the combustion of an over-stoichiometric mixture of air or oxygen-rich air or oxygen / fuel in a burner.
- the control of this selective oxidation preferably makes use of the measurement of the dew point in the zone (s) of installation of the (or) tube (s) modified (s).
- This measurement can be carried out by dew point transmitters installed in a fixed position and operating in a closed loop with the medium flow control members. oxidant injected by the injectors of oxidizing medium and / or, adjustment of the burners.
- the invention also relates to a device according to claim 5 ensuring the organization, in a preheating section and / or a maintenance section of a continuous galvanizing annealing furnace of steel strips equipped only with radiant tubes.
- at least one oxidation zone for preventing the selective oxidation of the alloying elements of the steel, by injecting an oxidizing medium in the oxidation zone characterized in that it comprises at least a tube comprising at least one branch provided with calibrated holes allowing the oxidizing medium to pass through the oxidation zone.
- the means for introducing the oxidizing medium may be either an injector ensuring the supply of the tube in a hot oxidizing medium such as water vapor, air or a gas rich in oxygen, or a burner feeding the tube into a product resulting from the combustion of an over-stoichiometric air / fuel mixture, a stoichiometric air / oxygen / fuel mixture or a stoichiometric air / oxygen fuel mixture within the non-explosive limit.
- a hot oxidizing medium such as water vapor, air or a gas rich in oxygen
- the modified tube (s) intended to provide the oxidizing medium necessary for the oxidation of the strip is (are), for example, a U-shaped tube whose inlet branch is equipped at its end with a device for injecting steam or air preheated or not, oxygenated or not oxygen or oxygen and whose branch opposite the inlet branch is closed at its end, at least one of the branches preferably the opposite branch to the input branch, is pierced with calibrated holes allowing said medium to pass.
- the U-tube can be replaced by any conventional tube shape such as, for example, a P-shape, a double-P shape, a W shape or a thermowell shape.
- the radiant tube intended to supply the oxidizing medium is a P-tube having an inlet branch equipped at its end with a burner and at least one of the branches, preferably the opposite branch.
- the input branch is pierced with calibrated holes allowing flue gases to pass through the furnace enclosure.
- the branch opposite to the input branch comprising the burner may allow some of the flue gases to escape outside the furnace through a calibrated orifice or comprise a heat exchanger device for preheating the air of combustion with flue gases.
- the P-tube can be replaced by any conventional tube shape such as, for example, a U-shape, a W-shape, a P-shape or a thermowell.
- the burner (s) are supplied with an over-stoichiometric air / fuel mixture or with a stoichiometric mixture of oxygen-enriched air / fuel or with a stoichiometric mixture of oxygenated air / fuel within the non-explosive limits.
- the tubes equipped with burner or injector, whatever their type, are directly interchangeable with existing ones. They can be installed on demand depending on the temperature chosen for the oxidation or be installed permanently at different points of the oven. In this case, they are activated according to the choice of the temperature at which it is desired to oxidize the strip, therefore the position of the tube in the oven.
- Another advantage of the method is to locate the injection of oxidizing medium exactly where it is needed, that is to say very close to the two faces of the steel strip and to be able to take advantage of the local effect of turbulence in contact with the band which favors the reactions between the medium and the band.
- the figure 2 describes the arrangement of the different sections of a radiant tube annealing furnace and, superimposed, the evolution of the temperature of the band B as it travels through the furnace (curve T).
- Said strip B enters the furnace 6 by a preheating section 61 followed by a temperature holding section 62, a cooling section 63 with slow cooling means 631 and fasting 632, an aging section 64 and a heating section 65 required for immersion in the zinc bath 7.
- the heating in particular in the preheating sections 61 and holding 62 of the furnace 6 is obtained by means of radiant tubes.
- a P-shaped radiant tube 2 is installed in the enclosure 1 of a galvanic annealing furnace, for example a preheating or holding section. It is assembled by a support 5 and a plate 4.
- a burner 3 fueled and combustion air is disposed at the end of the inlet branch 2a of the tube 2 and delivers in the tube of the flue gas at high temperature.
- burnt gases are essentially diffused in the chamber 1 by means of calibrated holes 6 formed in the branch 2b of the tube, opposite to the inlet branch 2a.
- This branch 2b is closed at its end so that partly the burnt gases recirculate in the tube.
- the branch 2b of the tube 2 in P opposite the burner 3 is equipped with a calibrated or adjustable device 7 to evacuate to the outside of the furnace part of the burnt gases.
- the branch 2b of the P-tube opposite the burner 3 is equipped with a heating device 8, 9 of the combustion air by the flue gases.
- the radiant tube may be of the double P type as shown in FIG. figure 6 .
- the burner 3 is disposed in the open end of the central input branch 2a of the tube 2.
- the holes 6 are then preferably formed in each of the opposite branches 2b located on either side of the central branch 2a.
- a U-tube 2 is installed in the enclosure 1 of a galvanizing annealing furnace. It is assembled by a support 5 and a plate 4.
- An injector 10 supplied with oxidizing gas under pressure such as water vapor, air or a mixture rich in oxygen delivers in the tube 2 a mixture of oxidizing gases. and mixing HNx at high temperature present in the oven enclosure.
- This mixture is diffused in the chamber 1 by means of calibrated holes 6 formed in the branch 2b opposite to the input branch 2a.
- the end of the branch 2b opposite to the input branch 2a comprising the injector is closed by a plug 11.
- the radiant tube 2 may be of the double-P type similar to that described in FIG. figure 6 , the burner being replaced by an injector 10.
- the injectors are static devices that do not require any other energy than that of the fluid, which are moreover always available in the metallurgical sites, the water vapor at pressures of 8 to 10 bars.
- the relaxation energy in the furnace enclosure leads to an effect of brewing and circulation that avoids the use of fans. The energy cost of the process is therefore very limited.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Coating With Molten Metal (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
L'invention se rapporte à la galvanisation en continu de bandes d'acier notamment AHSS à fortes teneurs en silicium, manganèse, aluminium et, en particulier, aux installations comportant un four à tubes radiants sans zone de chauffage à flamme directe.The invention relates to the continuous galvanizing of steel strips including AHSS high levels of silicon, manganese, aluminum and, in particular, facilities comprising a radiant tube furnace without direct flame heating zone.
L'évolution des matériaux employés dans la construction automobile a successivement conduit à la galvanisation des bandes d'acier préalablement à leur mise en oeuvre par les constructeurs automobiles afin d'améliorer la résistance à la corrosion des éléments de châssis et de carrosserie en acier. Puis, afin d'alléger les structures tout en améliorant la résistance à l'effondrement par choc (crash) des véhicules, ont été développés de nouvelles nuances d'aciers à très haute limite d'élasticité présentant une grande capacité d'allongement. De tels matériaux, nommés AHSS (Advanced High Strength Steels) font appel à des compositions chimiques et des procédures de mise en oeuvre spécifiques qui singularisent certaines familles d'acier tels que les aciers « DP » ou Dual Phase, les aciers « TRIP » ou TRansformation Induced Plasticity... Ces aciers sont, en particulier, décrits dans le «Advanced High Strength Steel (AHSS) application guidelines » préparé par le « Committee on Automotive Applications » de l'International Iron & Steel Institute.The evolution of the materials used in the automotive industry has successively led to the galvanization of the steel strips prior to their implementation by the car manufacturers to improve the corrosion resistance of the frame and steel body components. Then, in order to lighten the structures while improving the resistance to crash collapse (crash) of vehicles, new grades of very high yield strength steels with a high elongation capacity have been developed. Such materials, named AHSS (Advanced High Strength Steels) use specific chemical compositions and implementation procedures that singularize certain families of steel such as "DP" or Dual Phase steels, "TRIP" steels or TRansformation Induced Plasticity ... These steels are, in particular, described in the "Advanced High Strength Steel (AHSS) application guidelines" prepared by the "Committee on Automotive Applications" of the International Iron & Steel Institute.
Ces aciers ont ouvert de nouvelles perspectives dans la conception des automobiles mais posent un certain nombre de problèmes aux producteurs d'acier. En effet, certains de leurs éléments d'alliage tels que le manganèse, le silicium, l'aluminium, le chrome... forment à la surface des bandes d'acier une mince couche d'oxydes pendant l'opération de recuit précédant l'immersion dans le bain de galvanisation. Cette oxydation sélective nuit à la « mouillabilité » du zinc et donc à la qualité du revêtement. Ces phénomènes sont dus à des processus de diffusion des éléments d'alliage hautement oxydables vers la surface de la bande où ils peuvent s'oxyder même dans les zones à tubes radiants des fours où l'atmosphère est pourtant réductrice pour les oxydes de fer.These steels have opened new perspectives in the design of automobiles but pose a number of problems for steel producers. Indeed, some of their alloying elements such as manganese, silicon, aluminum, chromium ... form on the surface of steel strips a thin layer of oxides during the annealing operation preceding the immersion in the galvanizing bath. This selective oxidation damages the "wettability" of zinc and therefore the quality of the coating. These phenomena are due to diffusion processes of highly oxidizable alloying elements towards the surface of the strip where they can oxidize even in the zones with radiant tubes of the furnaces where the atmosphere is nevertheless reducing for the iron oxides.
De très nombreuses études ont été menées afin de comprendre la cinétique de ces phénomènes d'oxydation et d'apporter des solutions aux problèmes posés lors de la galvanisation. Le document de synthèse «
Parmi les solutions proposées afin d'assurer une galvanisation de qualité figurent des prétraitements superficiels des bandes d'acier avant leur mise en oeuvre dans les installations de galvanisation en continu (traitements chimiques, électrodéposition ou revêtement en phase vapeur par un très fin film de fer, nickel, cuivre...), des opérations d'enlèvement mécanique ou chimique des oxydes après recuit et avant l'entrée dans le bain de zinc.Among the solutions proposed for ensuring quality galvanization are surface pretreatments of the steel strips before their use in continuous galvanizing plants (chemical treatments, electrodeposition or vapor phase coating by a very thin iron film , nickel, copper ...), operations of mechanical or chemical removal of the oxides after annealing and before entering the zinc bath.
Une autre voie a été particulièrement étudiée qui consiste à soumettre, dans le four de recuit, la surface des bandes à des conditions de températures et d'atmosphère propres à oxyder rapidement et en profondeur les éléments d'alliage et éviter ainsi leur migration ultérieure en surface. Durant cette opération se forme une couche d'oxydes qui sera ultérieurement éliminée dans les zones suivantes du four de recuit sous atmosphère réductrice. De telles techniques d'oxydation / réduction contrôlées ont fait l'objet de nombreuses études et expérimentations. Le document « Enhancing the wettability of High Strength Steels during Hot-Dip galvanizing » présenté dans le cadre de la conférence « Galvatech 2004 » décrit les principes physiques qui régissent la formation contrôlée puis la réduction de cette couche d'oxydes. Le brevet
Le brevet
Le brevet
Toutefois, les fours de galvanisation ne comportent pas tous la zone DFF nécessaire pour pratiquer facilement l'oxydation et nombreux sont ceux qui mettent uniquement en oeuvre des tubes radiants. Or ces fours, malgré leur atmosphère contrôlée, n'évitent pas l'oxydation sélective des éléments d'alliage. Le brevet
Le procédé et le dispositif pour sa mise en oeuvre objets de la présente invention apportent la solution à ces deux problèmes.The method and the device for its implementation objects of the present invention provide the solution to these two problems.
De manière générale l'invention consiste à injecter un medium oxydant dans une section d'un four à tubes radiants, notamment à atmosphère azote / hydrogène, grâce à un ou plusieurs tubes, en particulier spécialement modifiés et capables d'être installés en lieu et place de n'importe lequel des tubes existants. En fonction de la plage de températures choisie pour l'oxydation, cette injection peut être réalisée dans n'importe quelle section du four, préférentiellement dans la section de préchauffage.In general, the invention consists in injecting an oxidizing medium into a section of a radiant tube furnace, particularly in a nitrogen / hydrogen atmosphere, using one or more tubes, in particular specially modified and capable of being installed in place of any of the existing tubes. Depending on the temperature range chosen for the oxidation, this injection can be carried out in any section of the furnace, preferably in the preheating section.
Le medium doit présenter, en fonction de la température de la bande et de la composition chimique de cette dernière, un point de rosée tel que les éléments d'alliage comme le silicium, le manganèse, l'aluminium, le chrome sont oxydés en profondeur et n'ont plus la possibilité de migrer en surface. En règle générale, ce point de rosée est supérieur à -20°C.The medium must have, depending on the temperature of the band and the chemical composition of the latter, a dew point such that the alloying elements such as silicon, manganese, aluminum, chromium are deeply oxidized. and no longer have the ability to migrate to the surface. As a general rule, this dew point is above -20 ° C.
Pour atteindre cet objectif, le médium injecté peut être de la vapeur d'eau ou de l'air ou un mélange riche en oxygène. Ce peut également être le produit résultant de la combustion d'un mélange sur-stoechiométrique air ou air suroxygéné ou oxygène / carburant dans un brûleur.To achieve this objective, the injected medium may be water vapor or air or a mixture rich in oxygen. It can also be the product resulting from the combustion of an over-stoichiometric mixture of air or oxygen-rich air or oxygen / fuel in a burner.
Ainsi, l'invention définie selon la revendication no.1 concerne en particulier un procédé assurant, dans un four de recuit de galvanisation en continu de bandes d'acier comprenant une section de préchauffage et une section de maintien et équipé uniquement de tubes radiants, l'oxydation de la bande visant à prévenir l'oxydation sélective des éléments d'alliage de l'acier, caractérisé en ce qu'il comprend les étapes suivantes:
- l'installation dans au moins un endroit de la section de chauffage du four et/ou dans au moins un endroit de la section de maintien du four, d'au moins un tube modifié capable d'injecter un médium oxydant ; et
- l'injection du médium oxydant par l'intermédiaire du (ou des) tube(s) modifiés(s) ;
- le médium oxydant ayant une composition telle que, dans les conditions de température du médium oxydant et de la bande d'acier, et en fonction de la composition chimique de la bande, il possède un point de rosée assurant l'oxydation en profondeur des éléments d'alliage de la bande d'acier.
- installing in at least one location of the heating section of the oven and / or in at least one location of the holding section of the oven, at least one modified tube capable of injecting an oxidizing medium; and
- injecting the oxidizing medium via the modified tube (s);
- the oxidizing medium having a composition such that, under the temperature conditions of the oxidizing medium and the steel strip, and depending on the chemical composition of the strip, it has a dew point ensuring the deep oxidation of the elements alloy of the steel strip.
Le contrôle de cette oxydation sélective fait de préférence appel à la mesure du point de rosée dans la ou les zone(s) d'installation du (ou des) tube(s) modifiés(s). Cette mesure peut être réalisée par des transmetteurs de point de rosée installés en poste fixe et fonctionnant en boucle fermée avec les organes de réglage du débit du médium oxydant injecté par les injecteurs de medium oxydant et/ou, de réglage des brûleurs.The control of this selective oxidation preferably makes use of the measurement of the dew point in the zone (s) of installation of the (or) tube (s) modified (s). This measurement can be carried out by dew point transmitters installed in a fixed position and operating in a closed loop with the medium flow control members. oxidant injected by the injectors of oxidizing medium and / or, adjustment of the burners.
L'invention concerne également un dispositif selon la revendication no.5 assurant l'organisation, dans une section de préchauffage et/ou une section de maintien d'un four de recuit de galvanisation en continu de bandes d'acier équipé uniquement de tubes radiants, d'au moins une zone d'oxydation visant à prévenir l'oxydation sélective des éléments d'alliages de l'acier, par injection d'un médium oxydant dans la zone d'oxydation, caractérisé en ce qu'il comprend au moins un tube comportant au moins une branche pourvue de trous calibrés laissant passer le médium oxydant dans la zone d'oxydation.The invention also relates to a device according to
Le moyen d'introduction du médium oxydant peut être soit un injecteur assurant l'alimentation du tube en un médium oxydant chaud tel que de la vapeur d'eau, de l'air ou un gaz riche en oxygène, soit un brûleur alimentant le tube en un produit résultant de la combustion d'un mélange sur-stoechimétrique air/combustible, d'un mélange stoechiométrique air suroxygéné/combustible ou d'un mélange stoéchiométrique air/combustible oxygéné dans la limite de non explosivité.The means for introducing the oxidizing medium may be either an injector ensuring the supply of the tube in a hot oxidizing medium such as water vapor, air or a gas rich in oxygen, or a burner feeding the tube into a product resulting from the combustion of an over-stoichiometric air / fuel mixture, a stoichiometric air / oxygen / fuel mixture or a stoichiometric air / oxygen fuel mixture within the non-explosive limit.
Le ou les tube(s) modifié(s) destinés à fournir le médium oxydant nécessaire à l'oxydation de la bande est (sont), par exemple, un tube en U dont une branche d'entrée est équipée à son extrémité d'un dispositif d'injection de vapeur d'eau ou d'air préchauffé ou non, suroxygéné ou non ou d'oxygène et dont la branche opposée à la branche d'entrée est obturée à son extrémité, au moins une des branches de préférence la branche opposée à la branche d'entrée, est percée de trous calibrés laissant passer ledit médium. Le tube en U peut être remplacé par n'importe quelle forme de tube classique comme, par exemple une forme en P, en double P, en W ou en doigt de gant.The modified tube (s) intended to provide the oxidizing medium necessary for the oxidation of the strip is (are), for example, a U-shaped tube whose inlet branch is equipped at its end with a device for injecting steam or air preheated or not, oxygenated or not oxygen or oxygen and whose branch opposite the inlet branch is closed at its end, at least one of the branches preferably the opposite branch to the input branch, is pierced with calibrated holes allowing said medium to pass. The U-tube can be replaced by any conventional tube shape such as, for example, a P-shape, a double-P shape, a W shape or a thermowell shape.
Selon une autre caractéristique de l'invention, le tube radiant destiné à fournir le médium oxydant est un tube en P ayant une branche d'entrée équipée à son extrémité d'un brûleur et dont au moins une des branches, de préférence la branche opposée à la branche d'entrée, est percée de trous calibrés laissant passer des gaz brûlés dans l'enceinte du four. La branche opposée à la branche d'entrée comportant le brûleur peut laisser s'évacuer une partie des gaz brûlés à l'extérieur du four à travers un orifice calibré ou comporter un dispositif échangeur de chaleur permettant de préchauffer l'air de combustion avec les gaz brûlés. Le tube en P peut être remplacé par n'importe quelle forme de tube classique comme, par exemple une forme en U, en W, endouble P ou en doigt de gant. Le ou les brûleurs sont alimentés en mélange sur-stoechiométrique air / combustible ou en mélange stoechiométrique air suroxygéné / combustible ou en mélange stoechiométrique air / combustible oxygéné dans les limites de non explosivité.According to another characteristic of the invention, the radiant tube intended to supply the oxidizing medium is a P-tube having an inlet branch equipped at its end with a burner and at least one of the branches, preferably the opposite branch. the input branch is pierced with calibrated holes allowing flue gases to pass through the furnace enclosure. The branch opposite to the input branch comprising the burner may allow some of the flue gases to escape outside the furnace through a calibrated orifice or comprise a heat exchanger device for preheating the air of combustion with flue gases. The P-tube can be replaced by any conventional tube shape such as, for example, a U-shape, a W-shape, a P-shape or a thermowell. The burner (s) are supplied with an over-stoichiometric air / fuel mixture or with a stoichiometric mixture of oxygen-enriched air / fuel or with a stoichiometric mixture of oxygenated air / fuel within the non-explosive limits.
Les tubes équipés de brûleur ou d'injecteur, quelque soit leur type, sont directement interchangeables avec ceux existants. Ils peuvent être installés à la demande en fonction de la température choisie pour l'oxydation ou être installés à demeure en différents points du four. Dans ce cas, ils sont activés en fonction du choix de la température à laquelle on souhaite oxyder la bande, donc de la position du tube dans le four.The tubes equipped with burner or injector, whatever their type, are directly interchangeable with existing ones. They can be installed on demand depending on the temperature chosen for the oxidation or be installed permanently at different points of the oven. In this case, they are activated according to the choice of the temperature at which it is desired to oxidize the strip, therefore the position of the tube in the oven.
Un autre avantage du procédé est de localiser l'injection de medium oxydant exactement là où on en a besoin, c'est-à-dire très près des deux faces de la bande d'acier et de pouvoir profiter de l'effet local de turbulence au contact de la bande qui favorise les réactions entre le médium et la bande.Another advantage of the method is to locate the injection of oxidizing medium exactly where it is needed, that is to say very close to the two faces of the steel strip and to be able to take advantage of the local effect of turbulence in contact with the band which favors the reactions between the medium and the band.
La suite de la description se réfère aux figures annexées qui représentent, respectivement:
-
Figure 1 , une ligne de galvanisation équipée d'un four à tubes radiants, -
Figure 2 , le cheminement de la bande d'acier depuis son entrée dans le four jusqu'à sa sortie du bain de zinc ainsi que la variation de sa température, -
Figures 3 à 6 , des tubes radiants selon l'invention équipés de brûleurs, -
Figures 7 , des tubes radiants selon l'invention équipés d'injecteurs.et 8
-
Figure 1 , a galvanizing line equipped with a radiant tube furnace, -
Figure 2 the path of the steel strip from its entry into the oven to its exit from the zinc bath and the variation of its temperature, -
Figures 3 to 6 , radiant tubes according to the invention equipped with burners, -
Figures 7 and 8 , radiant tubes according to the invention equipped with injectors.
Le revêtement des bandes d'acier par du zinc ou des alliages à base de zinc est réalisé sur des lignes continues de galvanisation telles que schématisée en
- Une section d'entrée avec une ou deux dérouleuses de bande 1
une cisaille guillotine 2 une soudeuse de raboutage 3 permettant de raccorder la queue d'une bande issue d'une des dérouleuses à la tête de la prochaine bande issue de l'autre dérouleuse et assurant ainsi un fonctionnement continu de la ligne, un accumulateur de bande 4 qui restitue à son aval de la bande préalablement accumulée lorsqu'on stoppe le déroulement en amont de l'accumulateur pour réaliser la soudure de raboutage. Une section 5 de dégraissage des bandes laminées à froid ou de décapage acide des bandes laminées à chaud.- Un four de recuit 6 assurant le chauffage, le maintien à la température de recuit, le refroidissement, le vieillissement lorsque nécessaire et la mise à température contrôlée de la bande avant son entrée dans le bain de zinc en fusion.
- Une section de galvanisation proprement dite avec le bain de
zinc 7 dans lequel est immergée la bande, un dispositif d'essorage duzinc liquide 8 éventuellement un four de galvanealing à induction 9,un refroidissement 10 et un bac de trempe 11. - Une section de sortie avec un ensemble de Skin-
Pass 12 une section de passivation 13 un accumulateur de sortie 14une cisaille 15 et une ou deux enrouleuses 16 travaillant alternativement.
- An entrance section with one or two belt unrollers 1 a
guillotine shear 2 asplice welder 3 allowing to connect the tail of a strip from one of the unrollers to the head of the next band from the other unroller and thus ensuring continuous operation of the line, atape accumulator 4 which restores on its downstream band previously accumulated when stopping the flow upstream of the accumulator to perform the solder splice. - A
section 5 for degreasing cold-rolled strip or acid pickling of hot-rolled strip. - An
annealing furnace 6 providing heating, maintaining the annealing temperature, cooling, aging when necessary and the controlled temperature setting of the strip before entering the molten zinc bath. - A galvanizing section proper with the
zinc bath 7 in which the strip is immersed, aliquid zinc spinner 8 possibly an induction galvanizing furnace 9, a cooling 10 and aquenching tank 11. - An output section with a set of Skin-Pass 12 a
passivation section 13 an output accumulator 14 ashear 15 and one or twowinders 16 working alternately.
La
Comme cela est connu en soi, le chauffage notamment dans les sections de préchauffage 61 et de maintien 62 du four 6 est obtenu au moyen de tubes radiants.As is known per se, the heating in particular in the preheating
Selon un premier mode de réalisation de l'invention représentée à la
En variante, comme représenté en
Dans une autre variante représentée en
Enfin, le tube radiant peut être du type en double P comme montré en
Selon un second mode de réalisation de l'invention représenté à la
En variante décrite en
Les injecteurs sont des dispositifs statiques ne nécessitant pas d'autre énergie que celle du fluide qui sont par ailleurs toujours disponibles dans les sites métallurgiques, la vapeur d'eau sous des pressions de 8 à 10 bars. D'autre part, l'énergie de détente dans l'enceinte du four entraine un effet de brassage et de circulation qui évite l'emploi de ventilateurs. Le coût énergétique du procédé est donc très limité.The injectors are static devices that do not require any other energy than that of the fluid, which are moreover always available in the metallurgical sites, the water vapor at pressures of 8 to 10 bars. On the other hand, the relaxation energy in the furnace enclosure leads to an effect of brewing and circulation that avoids the use of fans. The energy cost of the process is therefore very limited.
Claims (10)
- In a continuous galvanising annealing furnace for steel strips including a pre-heating section and a holding section and equipped with radiant tubes without a direct flame zone, method for oxidising the strip intended to prevent selective oxidation of steel alloy elements, characterised in that it includes the following steps:installation of at least one modified tube capable of injecting an oxidising medium in at least one place in the furnace pre-heating section and/or in at least one place in the furnace holding section; and injection of the oxidising medium by means of one or more modified tube(s) in that it includes at least one tube including at least one leg provided with calibrated holes allowing the oxidising medium to pass into an oxidation zone and replacing at least one existing radiant heating tube;the oxidising medium having a composition such that, in the temperature conditions of the oxidising medium and of the steel strip, and depending on the chemical composition of the strip, it has a dew point ensuring deep oxidation of the alloy elements of the steel strip, such as silicon, manganese, aluminium, chromium, in that the composition of the medium is such that, in the temperature conditions of the medium and of the strip, and depending on the chemical composition of said strip, the dew point of the medium is above -20°C.
- Method according to claim 1, characterised in that the oxidising medium is water vapour, air, or an oxygen-rich gas injected by means of an injector.
- Method according to claim 1 or 2, characterised in that the medium injected results from the combustion, thanks to a burner, of an over-stoichiometric air/fuel mixture, a stoichiometric oxygen-enriched air/fuel mixture or a stoichiometric air/fuel mixture oxygenated within the limits of non-explosibility.
- Method according to any one of claims 1 to 3, characterised in that it includes a step to measure the dew point of the oxidising medium in the furnace sections where the modified tubes are installed and a step to regulate the flow rate of the oxidising medium in said tubes in a closed loop with dew point measurement.
- Device for implementing the method according to one of the preceding claims providing for the organisation, in a pre-heating section and/or a holding section of a continuous galvanising annealing furnace for steel strips equipped with radiant tubes without a direct flame zone, of at least one oxidation zone intended to prevent selective oxidation of alloy elements of the steel through injection of an oxidising medium into the oxidation zone, characterised in that it includes at least one tube including at least one leg provided with calibrated holes allowing the oxidising medium to pass into the oxidation zone and replacing at least one existing radiant heating tube.
- Device according to claim 5, characterised in that the tube is a U-shaped or W-shaped or P-shaped or double P-shaped or glove-finger-shaped tube comprising an input leg provided with a burner the combustion gases of which constitute the oxidising medium and a leg opposite the input leg provided with the burner.
- Device according to claim 6, characterised in that the opposite leg of the U-shaped or W-shaped or P-shaped or double P-shaped tube is sealed at its end.
- Device according to claim 6, characterised in that the opposite leg of the U-shaped or W-shaped or P-shaped or double P-shaped tube comprises, at its end, a calibrated orifice to evacuate a part of the combustion gases.
- Device according to claim 6, characterised in that the opposite leg of the U-shaped or W-shaped or P-shaped or double P-shaped tube comprises a heat exchanger device to pre-heat a gas supplying the burner by means of the combustion gases.
- Device according to claim 5, characterised in that the tube is a U-shaped or W-shaped or P-shaped or double P-shaped or glove-finger-shaped tube, having an input leg provided with an injector intended to introduce the oxidising medium and a leg opposite the input leg comprising the injector, the end of which is sealed.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR0757331A FR2920439B1 (en) | 2007-09-03 | 2007-09-03 | METHOD AND DEVICE FOR THE CONTROLLED OXIDATION / REDUCTION OF THE SURFACE OF A CONTINUOUSLY STRAY STEEL BAND IN A RADIANT TUBE OVEN FOR ITS GALVANIZATION |
PCT/FR2008/000981 WO2009030823A1 (en) | 2007-09-03 | 2008-07-04 | Controlled method and device for oxidation/reduction of the surface of a steel strip running continuously through a radiant tube oven for galvanisation thereof |
Publications (3)
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EP2188399A1 EP2188399A1 (en) | 2010-05-26 |
EP2188399B1 true EP2188399B1 (en) | 2013-08-28 |
EP2188399B2 EP2188399B2 (en) | 2023-05-03 |
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EP08829848.4A Active EP2188399B2 (en) | 2007-09-03 | 2008-07-04 | Controlled method and device for oxidation/reduction of the surface of a steel strip running continuously through a radiant tube oven for galvanisation thereof |
Country Status (6)
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US (1) | US8609192B2 (en) |
EP (1) | EP2188399B2 (en) |
JP (1) | JP2010538163A (en) |
CN (1) | CN101796203B (en) |
FR (1) | FR2920439B1 (en) |
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2007
- 2007-09-03 FR FR0757331A patent/FR2920439B1/en not_active Expired - Fee Related
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2008
- 2008-07-04 JP JP2010523552A patent/JP2010538163A/en active Pending
- 2008-07-04 WO PCT/FR2008/000981 patent/WO2009030823A1/en active Application Filing
- 2008-07-04 EP EP08829848.4A patent/EP2188399B2/en active Active
- 2008-07-04 CN CN200880105309XA patent/CN101796203B/en active Active
- 2008-07-04 US US12/676,167 patent/US8609192B2/en active Active
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DE102013105378B3 (en) * | 2013-05-24 | 2014-08-28 | Thyssenkrupp Steel Europe Ag | Process for the preparation of a hot-dip coated flat steel product and continuous furnace for a hot-dip coating machine |
Also Published As
Publication number | Publication date |
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WO2009030823A1 (en) | 2009-03-12 |
CN101796203A (en) | 2010-08-04 |
EP2188399B2 (en) | 2023-05-03 |
CN101796203B (en) | 2011-12-14 |
US8609192B2 (en) | 2013-12-17 |
JP2010538163A (en) | 2010-12-09 |
FR2920439A1 (en) | 2009-03-06 |
US20100173072A1 (en) | 2010-07-08 |
FR2920439B1 (en) | 2009-11-13 |
EP2188399A1 (en) | 2010-05-26 |
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