EP0731853B1 - Dispositif de refroidissement accelere d'un substrat continu en defilement rapide dans un plan vertical - Google Patents
Dispositif de refroidissement accelere d'un substrat continu en defilement rapide dans un plan vertical Download PDFInfo
- Publication number
- EP0731853B1 EP0731853B1 EP95932579A EP95932579A EP0731853B1 EP 0731853 B1 EP0731853 B1 EP 0731853B1 EP 95932579 A EP95932579 A EP 95932579A EP 95932579 A EP95932579 A EP 95932579A EP 0731853 B1 EP0731853 B1 EP 0731853B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- substrate
- cooling
- cooling fluid
- enclosure
- tubes
- 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.)
- Expired - Lifetime
Links
- 238000001816 cooling Methods 0.000 title claims description 30
- 239000000758 substrate Substances 0.000 title claims description 23
- 239000003595 mist Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000012809 cooling fluid Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000002826 coolant Substances 0.000 description 8
- 238000005244 galvannealing Methods 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 6
- 229910052725 zinc Inorganic materials 0.000 description 6
- 239000011701 zinc Substances 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910001297 Zn alloy Inorganic materials 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000005246 galvanizing Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000017260 vegetative to reproductive phase transition of meristem Effects 0.000 description 1
Images
Classifications
-
- 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
Definitions
- the present invention relates to an accelerated cooling device continuous substrate moving rapidly in a vertical plane, plus particularly a coated metal strip, for example a sheet hot dip galvanized.
- the cooling device object of the present invention, will intentionally described and to facilitate understanding in as part of its use during cooling, after treatment of galvannealing, of a strip of galvanized steel, but this description in no way prejudges that the device of the invention cannot apply in other circumstances requiring conditions similar cooling.
- the heat treatment called "galvannealing” consists in subjecting a hot-dip galvanized steel sheet after heating, temperature maintenance then cooling.
- This treatment aims to ensure the diffusion of iron from the sheet through the coating layer, usually zinc or zinc alloy, so to obtain iron contents between 7% and 13% in the layer of the aforementioned coating.
- This heat treatment operation has for effect of obtaining a coating having better stampability and weldability.
- the classic galvannealing operation is carried out in an installation where the sheet describes at least two vertical passes namely a pass upward and downward pass.
- the sheet leaves the bath vertically galvanizing to start its upward phase and enter, directly after the wringing device consisting of air knives, in a heating oven which brings the sheet to a temperature between 460 ° C and 600 ° C; the sheet then circulates in a holding oven at temperature. Above this oven is located at least one device for cooling intended to solidify the coating of the sheet metal, so as not to damage this coating on the rollers return ending the ascending phase and guiding the sheet towards the phase descending.
- the quality of the coating obtained, after the operation of galvannealing is directly related to the diffusion of iron in the layer of zinc or zinc alloy and that this is favorably influenced by a sufficiently long temperature holding time, for example greater than 10 seconds.
- the applicant has developed a process in which the heating power as cooling flows to limit the space necessary for these two operations and thereby preserve a sufficient length to obtain a passage time in the furnace of keeping as high a temperature as possible in order to obtain optimal conditions for iron diffusion in the coating layer; the cycle thus produced approaches the ideal cycle called "square".
- US-A-3,428,023 also describes a device for depositing a coating of zinc on a moving steel strip, and to cool and solidify this coating by means of water spray jets.
- the present invention relates to an accelerated cooling device of low length, particularly suitable for being used for cooling rapid by means of water / air mist nozzles of a coated substrate after leaving it last out of a temperature maintenance oven and before passing over rollers referral, particularly in the context of galvannealing treatment.
- said angle is between 35 ° and 40 °.
- the means for forming one or more fog curtains comprise fog projection ramps, and said projection ramps consist of two tubes whose longitudinal axes are parallel to the plane of said substrate, one of the two tubes encompassing the other and one of the tubes being supplied with water while the other is supplied with air, as well as by sprinklers supplied with water and in air by the two aforementioned tubes so as to form said mist curtains.
- object of the invention comprises suction and evacuation means coolant outside the closed enclosure of said device cooling and preferably said means are located near of the upper end of the aforementioned device.
- the aforementioned evacuation means include fume extractor hoods used as cooling fluid.
- the previous modality provides a very effective solution to the problems techniques posed respectively, on the one hand by the waterfall in the bath of molten zinc and secondly by entrainment of fluid cooling outside the enclosure and bringing it into contact with the upper idler rollers.
- FIG. 1 shows that the substrate 1 passes through the bath 2 of zinc or zinc alloy contained in the galvanizing tank 3, leaves this last vertically after return around roller 4, goes through a roller guide system 5, spins at device level wringing 6, consisting of air knives intended to adjust the thickness of the coating layer on the substrate. This last then begins a vertical upward trajectory until the second deflection roller 7, follows a horizontal path up to third deflection roller 8, then descends in a trajectory vertical to a later operation.
- the substrate goes through a short rapid heater 9 and then a short temperature equalization device 10, a device much longer 11 holding temperature and finally in a short rapid cooling device 12 equipped with fog ramps water / air.
- FIG. 2 illustrates a preferred embodiment of the device 12 for rapidly cooling a coated substrate.
- the closed enclosure 13 including the rapid cooling device, the substrate to be cooled 1, the inlet 14 with compressed air barriers 141 preventing the coolant go down to the galvanizing bath, outlet 15 with air dams 151 preventing coolant from escaping towards the upper deflection rollers, the projection ramps 16 water / air mist, as well as devices 161, such as deflectors, intended to promote contact between the substrate and the fog and finally the hoods 17 for extracting the fog out of the enclosure defining the cooling device.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
Description
- la figure 1
- illustre le principe du traitement thermique de galvannealing;
- la figure 2
- représente une vue globale du dispositif de refroidissement de l'invention.
Claims (3)
- Dispositif de refroidissement accéléré d'un substrat continu en défilement rapide dans un plan vertical, formé par une enceinte close comportant un orifice inférieur d'entrée et un orifice supérieur de sortie pour le passage dudit substrat, dans lequel ladite enceinte comprend une zone de refroidissement, dite principale, dotée de moyens d'introduction du fluide de refroidissement sous la forme de rideaux de brouillard eau-air de part et d'autre dudit substrat, une zone de refroidissement, dite secondaire, dotée de moyens favorisant le contact entre le fluide de refroidissement et le substrat, et une zone d'extraction du fluide de refroidissement, et dans lequel lesdits orifices d'entrée et de sortie sont dotés de moyens de retenue du fluide de refroidissement à l'intérieur de l'enceinte, caractérisé en ce que lesdits rideaux de brouillard sont disposés dans l'espace en formant un angle compris entre 30° et 60° par rapport au sens de mouvement dudit substrat, et en ce que lesdits moyens de retenue du fluide de refroidissement sont constitués par des jets d'air comprimé disposés de part et d'autre dudit substrat et dirigés vers celui-ci, pour empêcher toute sortie de fluide de refroidissement hors de ladite enceinte.
- Dispositif de refroidissement suivant la revendication 1, caractérisé en ce que ledit angle est compris entre 35° et 40°.
- Dispositif de refroidissement suivant la revendication 1 ou 2, caractérisé en ce que les moyens pour former un ou plusieurs rideaux de brouillard comprennent des rampes de projection de brouillard et en ce que lesdites rampes de projection sont constituées par deux tubes dont les axes longitudinaux sont parallèles au plan dudit substrat, l'un des deux tubes englobant l'autre et l'un des tubes étant alimenté en eau tandis que l'autre est alimenté en air, ainsi que par des gicleurs alimentés en eau et en air par les deux tubes précités de manière à former lesdits rideaux de brouillard.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE9400973 | 1994-10-26 | ||
| BE9400973A BE1008792A6 (fr) | 1994-10-26 | 1994-10-26 | Dispositif de refroidissement accelere d'un substrat continu en defilement rapide dans un plan vertical. |
| PCT/BE1995/000089 WO1996013619A1 (fr) | 1994-10-26 | 1995-09-27 | Dispositif de refroidissement accelere d'un substrat continu en defilement rapide dans un plan vertical |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0731853A1 EP0731853A1 (fr) | 1996-09-18 |
| EP0731853B1 true EP0731853B1 (fr) | 1999-08-11 |
Family
ID=3888439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95932579A Expired - Lifetime EP0731853B1 (fr) | 1994-10-26 | 1995-09-27 | Dispositif de refroidissement accelere d'un substrat continu en defilement rapide dans un plan vertical |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5843367A (fr) |
| EP (1) | EP0731853B1 (fr) |
| JP (1) | JPH09507533A (fr) |
| BE (1) | BE1008792A6 (fr) |
| DE (1) | DE69511372T2 (fr) |
| WO (1) | WO1996013619A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100266783A1 (en) * | 2009-04-15 | 2010-10-21 | Hot Dip Solutions, Llc | Method of coating a substrate |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3428023A (en) * | 1964-07-02 | 1969-02-18 | Dominion Foundries & Steel | Quenching zinc metal coatings with atomised water spray |
| US3782326A (en) * | 1971-03-16 | 1974-01-01 | Australian Wire Ind Pty | Primary water quench |
| US3853306A (en) * | 1971-12-28 | 1974-12-10 | Bethlehem Steel Corp | Apparatus for quenching molten coatings |
| JPS5856029B2 (ja) * | 1979-12-11 | 1983-12-13 | 新日本製鐵株式会社 | ストリツプの冷却装置 |
| US4367597A (en) * | 1979-12-13 | 1983-01-11 | Nippon Steel Corporation | Gas-liquid cooling apparatus |
| US4407487A (en) * | 1980-01-15 | 1983-10-04 | Heurtey Metallurgie | Device for cooling metal articles |
| US4361448A (en) * | 1981-05-27 | 1982-11-30 | Ra-Shipping Ltd. Oy | Method for producing dual-phase and zinc-aluminum coated steels from plain low carbon steels |
| JPS5967323A (ja) * | 1982-10-07 | 1984-04-17 | Nippon Steel Corp | 鋼帯の冷却装置 |
| CA1328166C (fr) * | 1988-09-29 | 1994-04-05 | Hidekazu Kawano | Dispositif d'injection a double jet et appareil de fabrication de tole d'acier revetue |
-
1994
- 1994-10-26 BE BE9400973A patent/BE1008792A6/fr not_active IP Right Cessation
-
1995
- 1995-09-27 WO PCT/BE1995/000089 patent/WO1996013619A1/fr not_active Ceased
- 1995-09-27 US US08/666,408 patent/US5843367A/en not_active Expired - Lifetime
- 1995-09-27 JP JP8514196A patent/JPH09507533A/ja active Pending
- 1995-09-27 DE DE69511372T patent/DE69511372T2/de not_active Expired - Lifetime
- 1995-09-27 EP EP95932579A patent/EP0731853B1/fr not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09507533A (ja) | 1997-07-29 |
| BE1008792A6 (fr) | 1996-08-06 |
| WO1996013619A1 (fr) | 1996-05-09 |
| EP0731853A1 (fr) | 1996-09-18 |
| DE69511372T2 (de) | 2000-05-11 |
| DE69511372D1 (de) | 1999-09-16 |
| US5843367A (en) | 1998-12-01 |
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