EP1457580A1 - Procédé d'oxydation controlée de bandes avant galvanisation en continu et ligne de galvanisation - Google Patents
Procédé d'oxydation controlée de bandes avant galvanisation en continu et ligne de galvanisation Download PDFInfo
- Publication number
- EP1457580A1 EP1457580A1 EP04290508A EP04290508A EP1457580A1 EP 1457580 A1 EP1457580 A1 EP 1457580A1 EP 04290508 A EP04290508 A EP 04290508A EP 04290508 A EP04290508 A EP 04290508A EP 1457580 A1 EP1457580 A1 EP 1457580A1
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- EP
- European Patent Office
- Prior art keywords
- strip
- galvanizing
- temperature
- furnace
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000005246 galvanizing Methods 0.000 title claims abstract description 47
- 230000003647 oxidation Effects 0.000 title claims abstract description 33
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000001301 oxygen Substances 0.000 claims abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 11
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 7
- 230000007423 decrease Effects 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 5
- 230000007547 defect Effects 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 238000010791 quenching Methods 0.000 claims 2
- 230000000171 quenching effect Effects 0.000 claims 2
- 238000006073 displacement reaction Methods 0.000 claims 1
- 238000007598 dipping method Methods 0.000 abstract description 3
- 238000002791 soaking Methods 0.000 abstract description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 9
- 229910052725 zinc Inorganic materials 0.000 description 9
- 239000011701 zinc Substances 0.000 description 9
- 229910052804 chromium Inorganic materials 0.000 description 6
- 229910052748 manganese Inorganic materials 0.000 description 6
- 229910052750 molybdenum Inorganic materials 0.000 description 6
- 230000001590 oxidative effect Effects 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 235000013980 iron oxide Nutrition 0.000 description 4
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000003570 air Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001052 transient effect Effects 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
- C23C2/0034—Details related to elements immersed in bath
- C23C2/00342—Moving elements, e.g. pumps or mixers
- C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
- C23C2/0035—Means for continuously moving substrate through, into or out of the 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
- C23C2/003—Apparatus
- C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0224—Two or more thermal pretreatments
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
- F24H9/0042—Cleaning arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
Definitions
- the invention relates to a galvanizing process continuously hot by dipping a steel strip having oxidizable additives in one proportion to improve properties steel mechanics.
- Hot dip galvanizing ovens typically comprise several sections equipped to carry out different phases heat treatment which are generally: heating, holding, cooling.
- the oven heat treatment is conditioned by an atmosphere neutral or reducing, generally consisting of mixture of nitrogen and hydrogen to reduce iron oxides present on the surface of the front plates their galvanization.
- the object of the proposed invention is to provide a device and method for hot-dip galvanizing continuously tempered which allow to process correctly bands containing elements of oxidizable addition the content of which is sufficient for improve the mechanical properties of steel.
- the invention relates to a galvanizing line in continuous hot with the dip of a steel strip having oxidizable additives in one proportion to improve properties steel mechanics, according to which the strip travels in a galvanizing furnace under an atmosphere reducing, with soaking in a galvanizing bath, this line being characterized in that it comprises upstream of the galvanizing furnace a heating means tape at an appropriate temperature followed by area to expose the strip to an oxidizing atmosphere whose oxygen content is such that, taking into account the strip temperature and the duration of the treatment, the oxidizable addition elements of the steel strip be oxidized on the surface and immediately below the surface of the strip before they could not migrate to said surface to form a layer of oxides capable of causing defects in galvanizing.
- the iron oxides produced during this operation will be reduced during the passage of the tape in the oven.
- the strip is brought to a temperature between 150 ° C and 400 ° C, preferably between 150 ° C and 300 ° C approximately, for the oxidation treatment.
- the control of the oxidation of its surface, for an oxidizing atmosphere given will be made by the choice of the couple strip temperature / residence time in the oxidizing atmosphere.
- Control of this temperature / residence time couple will be carried out continuously and will take into account the operation of the line, in particular the instant tape speed.
- the control of the tape oxidation treatment can be carried out by regulating the heating power located upstream of the oven (action on the temperature of the band) or by acting on the distance between the element heater located upstream of the oven and the oven inlet (action on the oxidation time).
- the oxidizing atmosphere in which takes place the controlled oxidation operation of the surface of the tape can be ambient air or any other atmosphere confined in an enclosure installed upstream of the oven and whose oxygen content will be checked.
- FIG. 1 of the drawings we can see, schematically shown, a galvanizing line continuously hot by dipping a steel strip 1 in a zinc galvanizing bath in fusion 2.
- the line includes a galvanizing oven produced according to state of the art 3 for the treatment of strip 1 before its soaking in the bath 2.
- the oven includes several sections equipped to carry out successively the different phases of the treatment which are generally heating, maintaining then cooling to a temperature suitable for the deposition of zinc on the surface of the strip.
- the atmosphere of the oven 3 is reducing, produced by a mixture of gases traditionally nitrogen with hydrogen with a dew point kept as low as possible.
- the steel strip 1 contains addition elements oxidizable such as Si, Cr, Mn, Mo in proportions sufficient to improve its characteristics mechanical.
- addition elements oxidizable such as Si, Cr, Mn, Mo in proportions sufficient to improve its characteristics mechanical.
- this type of line of galvanizing did not allow galvanizing properly continuous, hot, dip, steel containing such oxidizable elements according to such proportions because, as already explained, during the heating and holding treatment at high temperature, a very thin layer of oxide of these addition elements formed on the surface and kept it in the molten zinc which caused defects in the coating.
- the strip 1 in zone 8 to an oxidation treatment under atmospheric, temperature and residence times such as addition items oxidizable including Si, Cr, Mn or Mo, are oxidized under the surface of the tape before they could migrate to this surface to form a layer oxide capable of causing defects in galvanizing.
- iron oxides are formed on the surface of the strip. These iron oxides are reduced in the oven enclosure 3 so that the strip 1, when it enters the molten zinc bath 2 has a surface with an oxide layer of reduced addition elements which allows good galvanizing.
- Zone 8 includes a heating means for carrying the strip 1 at the desired temperature, typically between 150 ° C and 400 ° C.
- a means of control 7 consisting of a calculator or a computer is provided to adjust the heating of the strip from sensors such as 4 band speed sensors, of temperature 5 and emissivity 6 of the surface of the bandaged.
- the control of the oxidation kinetics results, in function of a given oxidizing atmosphere, the control of the final temperature of strip 1 in output of the heating means 8 and the residence time of strip 1 in zone 8 and between zone 8 and the inlet of the oven 3.
- the combination of these parameters is optimized according to the grade of steel to process, line speed and thickness and of the width of the strip.
- the heating means 8 is chosen to have a low thermal inertia and high reactivity so maintain control of surface oxidation of the band during the transient phases caused by line speed variations or tape format variations 1.
- This heating medium 8 could be constituted by a gas oven, fire type naked or indirect heating, preferably this means of heating will consist of an induction furnace electromagnetic.
- the induction oven has at minus an inductor which can be close together or away from the galvanizing furnace to modulate the heating kinetics produced.
- Band 1 oxidation treatment in zone 8 and between zone 8 and the inlet of oven 3 will be preferably performed in air.
- Oxidation control of the tape will be achieved then by controlling two parameters: the temperature of the strip at the outlet of 8 and the residence time of the air strip between its entry into zone 8 and entry into oven 3. The temperature should be increased when the speed of the line will increase to compensate for the decrease in high temperature strip residence time in the air.
- Fig. 2 shows the temperature variation of a point of band 1 plotted on the ordinate as a function of the position of this point on the line carried in abscissa.
- the strip temperature is low, for example lower than 100 ° C and corresponds to segment 9.
- the temperature of strip 1 since its exit of the heating means 8 until it enters the oven 3 remains substantially constant as shown by segment 11, the oxidation treatment is continues during this phase. In the oven 3 enclosure, the heating of strip 1 will continue according to a cycle adapted to its metallurgy and symbolized by 12.
- Tape oxidation control can be performed by action on one or more of parameters presented in Fig. 2. It is possible act on the temperature of the strip by varying the average slope of segment 10 to obtain a level variable of the level of segment 11. It is possible also to vary the duration of step 11 or modify the efficiency of the band oxidation during the level 11, for example by varying the oxygen concentration of the oxidizing atmosphere at which is exposed the tape during this level of treatment.
- Fig. 3 shows a variant of FIG. 1 in which the heating zone 8 is so connected watertight at the inlet of the oven 3 through the enclosure 13.
- the heating zone 8 is so connected watertight at the inlet of the oven 3 through the enclosure 13.
- enclosure 13 it is possible to control the oxygen concentration so that adapt the oxidation of the strip to the specific type steel, belt speed or whatever parameter necessary for controlling the kinematics band oxidation.
- Oxygen rate control of enclosure 13 as well as the seals of this enclosure vis-à-vis the outside or the enclosure of the oven 3 will be made according to the means of the state of art.
- Control of the duration of the oxidation treatment in function of line operating parameters can be advantageously carried out by the modification of the length of strip 1 between the outlet of the means of heating 8 and the oven inlet 3. This variation of length can be carried out in various ways.
- a first possibility consists in moving the means heating 8 in the direction of the strip 1 as illustrated schematically in FIG. 4 by the arrow in dashes 14. For a given tape speed, when the heating means 8 is brought closer to the oven 3, the duration of processing decreases while when the means of heater 8 is away from oven 3, the duration of treatment increases.
- FIG. 5 A second possibility is illustrated in FIG. 5.
- the heating means 8 are fixed. Between the means heating 8 and the oven 3, the strip 1 passes over a fixed roller 15 and on a mobile roller 16 which can be moved parallel to the direction of the tape as shown schematically by arrow 17.
- the moving roller 16 When the moving roller 16 is moved towards the right the strip length between the means of heating 8 and the oven 3 increases which increases the duration of the oxidation treatment. Conversely, when the moving roller 16 is moved to the left of the Fig. 5, the strip length decreases which reduces the duration of treatment.
- This arrangement with a roller mobile 16 and two horizontal strands of tape can be repeated several times with multiple rollers and several strands of variable length in order to increase the strip length between 8 and 3 and increase the possibility of variation of this length.
- Fig. 6 shows a variant of FIG. 5 for which the heating means 8 are fixed and the strip 1 passes over two fixed rollers 20 and 21 and over a movable roller 19 which can be moved perpendicular to the main direction of the strip as shown schematically by arrow 18.
- the moving roller 19 is moved upwards, the strip length between the heating means 8 and the oven 3 increases which increases the duration of the oxidation treatment.
- the roller mobile 19 is moved down in FIG. 6, the strip length decreases which reduces the duration of the treatment.
- This arrangement with a roller 19 and two vertical strands of tape can be repeated several times to increase the tape length between 8 and 3 and increase the possibility of variation of this length.
- rollers 15 and 17 of FIG. 5 or the rollers 19, 20 and 21 of FIG. 6 in an enclosure such as 13 in which the oxygen concentration can be controlled and adjusted to the treatment to be obtained.
- the band 1 arrives in the molten zinc bath 2 with a surface on which the formation of oxides has been limited, including for elemental oxides of addition, so that the adhesion of zinc on this surface can be done at best.
- the galvanizing line according to the invention constitutes a flexible production tool allowing economically galvanize various steel grades whatever the nature of their flawless additives of deposition of zinc on their surface.
- the necessary devices the implementation of the control process the oxidation of the bands comprising additives such as If, Cr, Mn, Mo ... can be easily added to a existing facility to expand its range of production or, on a facility where they are installed, they can be easily disabled to the production of steel grades not including these additives.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Coating With Molten Metal (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
Description
- Fig. 1 est un schéma d'une ligne de galvanisation en continu à chaud au trempé mettant en oeuvre le procédé de l'invention,
- Fig. 2 est un diagramme représentant la variation de la température d'un point de la bande, portée en ordonnée, en fonction de la position du point sur la ligne présenté en abscisse,
- Fig. 3 est un schéma d'une variante de la ligne de galvanisation,
- Fig. 4 à 6 sont des autres variantes de réalisation.
Claims (12)
- Procédé de galvanisation en continu à chaud au trempé d'une bande d'acier (1) comportant des éléments d'addition oxydables en une proportion permettant d'améliorer les propriétés mécaniques de l'acier, selon lequel la bande chemine dans un four de galvanisation (3) sous une atmosphère réductrice, ce four étant constitué de sections de traitement thermique, de chauffage, de maintien, de refroidissement et de trempé dans un bain de galvanisation (2),la bande ayant été soumise à un traitement d'oxydation dans des conditions de température, de durée et de teneur en oxygène d'un gaz dans lequel baigne la bande, telles que les éléments d'addition oxydables soient oxydés essentiellement à l'intérieur de la bande, avant qu'ils n'aient pu migrer vers la surface pour y former une couche d'oxydes de nature à créer des défauts de galvanisation,
caractérisé en ce que la bande est soumise au traitement d'oxydation en amont de la section d'entrée du four, que le gaz dans lequel baigne la bande pour le traitement d'oxydation est l'air, que cette bande est portée à une température comprise entre 150°C et 400°C environ pour le traitement d'oxydation, et que le contrôle de l'oxydation à la surface et immédiatement sous la surface de la bande est effectué par contrôle du couple température/temps de telle sorte que la température de la bande d'acier (1) est augmentée lorsque la vitesse de ligne augmente et que le temps de traitement diminue, et inversement. - Procédé selon la revendication 1, caractérisé en ce que la bande d'acier est portée à une température comprise entre 150°C et 300°C environ pour le traitement d'oxydation.
- Procédé selon la revendication 1 ou 2, caractérisé en ce que le contrôle de la température est effectué à partir de la puissance d'un moyen de chauffage (8) de la bande en amont du four de galvanisation.
- Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le contrôle de la durée du traitement d'oxydation est effectué par modification de la longueur de bande (1) entre la sortie d'un moyen de chauffage (8) situé en amont du four et l'entrée du four de galvanisation (3).
- Procédé selon la revendication 4, caractérisé en ce que la modification de la longueur de bande entre la sortie du moyen de chauffage (8) et l'entrée du four de galvanisation (3) est assurée par déplacement du moyen de chauffage (8) suivant la direction de la bande.
- Procédé selon la revendication 5, caractérisé en ce que la modification de la longueur de bande entre la sortie du moyen de chauffage (8) et l'entrée du four de galvanisation (3) est assurée par réglage de la longueur d'au moins un brin vertical ou horizontal de la bande, ou une combinaison des deux.
- Ligne de galvanisation en continu à chaud au trempé d'une bande d'acier (1) comportant des éléments d'addition oxydables en une proportion permettant d'améliorer les propriétés mécaniques de l'acier, selon laquelle la bande chemine dans un four de galvanisation (3) sous une atmosphère réductrice, avec trempé dans un bain de galvanisation (2), caractérisée en ce qu'elle comprend en amont du four de galvanisation un moyen de chauffage (8) de la bande à une température comprise entre 150°C et 400°C environ, et une zone pour exposer la bande à un gaz d'oxydation dont la teneur en oxygène est telle que, compte tenu de la température et de la durée de traitement, les éléments d'addition oxydables de la bande d'acier soient oxydés à l'intérieur de cette bande avant qu'ils n'aient pu migrer vers la surface pour y former une couche d'oxyde.
- Ligne de galvanisation selon la revendication 9, caractérisée en ce que le moyen de chauffage (8) est constitué par un four à induction qui constitue également la zone pour exposer la bande à un gaz d'oxydation.
- Ligne de galvanisation selon la revendication 7 ou 8, caractérisée en ce que la zone de chauffage (8) est reliée de façon étanche à l'entrée du four (3) par une enceinte (13) dans laquelle la concentration en oxygène peut être contrôlée et ajustée au traitement à obtenir.
- Ligne de galvanisation selon la revendication 8, caractérisée en ce que le four à induction comporte au moins une bobine inductrice qui peut être rapprochée ou éloignée du four de galvanisation pour moduler la cinétique d'échauffement produite.
- Ligne de galvanisation selon la revendication 7, caractérisée en ce que le moyen de chauffage est constitué par un four à gaz.
- Ligne de galvanisation selon l'une des revendications 7 à 11, caractérisée en ce que qu'elle comprend un moyen de contrôle (7) propre à agir sur le moyen de chauffage (8) pour maintenir la bande à une température déterminée à la sortie du moyen de chauffage, en réponse à des informations fournies par des capteurs (4,5,6).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0303058 | 2003-03-12 | ||
FR0303058A FR2852330B1 (fr) | 2003-03-12 | 2003-03-12 | Procede d'oxydation controlee de bandes avant galvanisation en continu et ligne de galvanisation |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1457580A1 true EP1457580A1 (fr) | 2004-09-15 |
Family
ID=32749781
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04290508A Withdrawn EP1457580A1 (fr) | 2003-03-12 | 2004-02-25 | Procédé d'oxydation controlée de bandes avant galvanisation en continu et ligne de galvanisation |
Country Status (7)
Country | Link |
---|---|
US (1) | US20040177903A1 (fr) |
EP (1) | EP1457580A1 (fr) |
KR (1) | KR20040080377A (fr) |
CN (1) | CN100554489C (fr) |
DE (1) | DE04290508T1 (fr) |
ES (1) | ES2226608T1 (fr) |
FR (1) | FR2852330B1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008135445A1 (fr) * | 2007-05-02 | 2008-11-13 | Corus Staal B.V. | Procédé de galvanisation par immersion à chaud d'un matériau en bande ahss ou uhss, et un tel matériau |
FR2920439A1 (fr) * | 2007-09-03 | 2009-03-06 | Siemens Vai Metals Tech Sas | Procede et dispositif d'oxydation/reduction controlee de la surface d'une bande d'acier en defilement continu dans un four a tubes radiants en vue de sa galvanisation |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004059566B3 (de) * | 2004-12-09 | 2006-08-03 | Thyssenkrupp Steel Ag | Verfahren zum Schmelztauchbeschichten eines Bandes aus höherfestem Stahl |
WO2007124781A1 (fr) * | 2006-04-26 | 2007-11-08 | Thyssenkrupp Steel Ag | Procédé de revêtement par immersion en fusion d'un produit plat en acier hyperrésistant |
KR101794102B1 (ko) * | 2009-05-28 | 2017-11-06 | 블루스코프 스틸 리미티드 | 금속 코팅된 강철 스트립 |
DE102011102659A1 (de) * | 2011-05-27 | 2012-11-29 | ThermProTEC Asia UG (haftungsbeschränkt) | Verfahren und Vorrichtung zum Voroxidieren von Metallbändern |
JP6354069B2 (ja) * | 2015-06-11 | 2018-07-11 | Jfeスチール株式会社 | 溶融金属めっき鋼帯の製造方法および溶融金属めっき鋼帯の製造ライン |
WO2017115180A1 (fr) * | 2015-12-28 | 2017-07-06 | Sabic Global Technologies B.V. | Rouleau immergé synchronisé |
FR3046423B1 (fr) * | 2015-12-30 | 2018-04-13 | Fives Stein | Dispositif et procede pour realiser une oxydation controlee de bandes metalliques dans un four de traitement en continu |
CN112461393B (zh) * | 2020-12-04 | 2021-06-15 | 中国科学院力学研究所 | 同轴热电偶瞬态热流传感器氧化式绝缘层加工制作装置 |
CN113621908A (zh) * | 2021-07-06 | 2021-11-09 | 无锡苏盛金属制品有限公司 | 一种热镀金属钢带的制造工艺及方法 |
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US2197622A (en) * | 1937-04-22 | 1940-04-16 | American Rolling Mill Co | Process for galvanizing sheet metal |
US3925579A (en) * | 1974-05-24 | 1975-12-09 | Armco Steel Corp | Method of coating low alloy steels |
FR2385801A1 (fr) * | 1977-04-02 | 1978-10-27 | Aeg Elotherm Gmbh | Procede d'echauffement au passage d'une piece a traiter metallique allongee, en particulier pour l'echauffement au passage de tubes d'acier |
EP0107991A1 (fr) * | 1982-10-06 | 1984-05-09 | Fabrique De Fer De Maubeuge | Dispositif et procédé de réglage de la capacité de chauffe d'une installation thermique pour bande métallique défilant en continu |
US20020162612A1 (en) * | 2000-03-08 | 2002-11-07 | Stein Heurtey | Preheating of metal strip, especially in galvanizing or annealing lines |
EP1285972A1 (fr) * | 2001-08-21 | 2003-02-26 | Stein Heurtey | Procédé de galvanisation à chaud de bandes métalliques d'aciers à haute résistance |
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US3518109A (en) * | 1968-01-15 | 1970-06-30 | Inland Steel Co | Apparatus and method for controlling thickness of molten metal coating by a moving magnetic field |
US4059494A (en) * | 1974-11-19 | 1977-11-22 | Sumitomo Aluminum Smelting Co., Ltd. | Process for continuous electrolytic coloring of aluminum or aluminum base alloy strip and wire |
DE4302698B4 (de) * | 1993-02-01 | 2007-09-27 | Sms Demag Ag | Verfahren und Vorrichtung zum Führen eines Stahlbandes während seines Durchlaufs durch eine kontinuierliche Behandlungsanlage |
AUPM654594A0 (en) * | 1994-06-29 | 1994-07-21 | Verson International (Aust) Pty Ltd | Method and apparatus to galvanise metal strip |
-
2003
- 2003-03-12 FR FR0303058A patent/FR2852330B1/fr not_active Expired - Lifetime
-
2004
- 2004-02-25 ES ES04290508T patent/ES2226608T1/es active Pending
- 2004-02-25 DE DE04290508T patent/DE04290508T1/de active Pending
- 2004-02-25 EP EP04290508A patent/EP1457580A1/fr not_active Withdrawn
- 2004-03-03 US US10/790,712 patent/US20040177903A1/en not_active Abandoned
- 2004-03-11 CN CNB2004100284264A patent/CN100554489C/zh not_active Expired - Fee Related
- 2004-03-11 KR KR1020040016501A patent/KR20040080377A/ko not_active Application Discontinuation
Patent Citations (6)
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US2197622A (en) * | 1937-04-22 | 1940-04-16 | American Rolling Mill Co | Process for galvanizing sheet metal |
US3925579A (en) * | 1974-05-24 | 1975-12-09 | Armco Steel Corp | Method of coating low alloy steels |
FR2385801A1 (fr) * | 1977-04-02 | 1978-10-27 | Aeg Elotherm Gmbh | Procede d'echauffement au passage d'une piece a traiter metallique allongee, en particulier pour l'echauffement au passage de tubes d'acier |
EP0107991A1 (fr) * | 1982-10-06 | 1984-05-09 | Fabrique De Fer De Maubeuge | Dispositif et procédé de réglage de la capacité de chauffe d'une installation thermique pour bande métallique défilant en continu |
US20020162612A1 (en) * | 2000-03-08 | 2002-11-07 | Stein Heurtey | Preheating of metal strip, especially in galvanizing or annealing lines |
EP1285972A1 (fr) * | 2001-08-21 | 2003-02-26 | Stein Heurtey | Procédé de galvanisation à chaud de bandes métalliques d'aciers à haute résistance |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008135445A1 (fr) * | 2007-05-02 | 2008-11-13 | Corus Staal B.V. | Procédé de galvanisation par immersion à chaud d'un matériau en bande ahss ou uhss, et un tel matériau |
US8465806B2 (en) | 2007-05-02 | 2013-06-18 | Tata Steel Ijmuiden B.V. | Method for hot dip galvanizing of AHSS or UHSS strip material, and such material |
FR2920439A1 (fr) * | 2007-09-03 | 2009-03-06 | Siemens Vai Metals Tech Sas | Procede et dispositif d'oxydation/reduction controlee de la surface d'une bande d'acier en defilement continu dans un four a tubes radiants en vue de sa galvanisation |
WO2009030823A1 (fr) * | 2007-09-03 | 2009-03-12 | Siemens Vai Metals Technologies Sas | Procede et dispositif d'oxydation/reduction controlee de la surface d'une bande d'acier en defilement continu dans un four a tubes radiants en vue de sa galvanisation |
CN101796203B (zh) * | 2007-09-03 | 2011-12-14 | 西门子Vai金属科技有限公司 | 连续行经辐射管炉用以镀锌的钢带的表面受控氧化-还原的方法和设备 |
US8609192B2 (en) | 2007-09-03 | 2013-12-17 | Siemens Vai Metals Technologies Sas | Method and device for controlling oxidizing-reducing of the surface of a steel strip running continuously through a radiant tubes furnace for its galvanizing |
Also Published As
Publication number | Publication date |
---|---|
KR20040080377A (ko) | 2004-09-18 |
CN1530458A (zh) | 2004-09-22 |
FR2852330B1 (fr) | 2007-05-11 |
FR2852330A1 (fr) | 2004-09-17 |
CN100554489C (zh) | 2009-10-28 |
US20040177903A1 (en) | 2004-09-16 |
DE04290508T1 (de) | 2005-03-31 |
ES2226608T1 (es) | 2005-04-01 |
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