EP1352099A1 - Procede pour eviter l'entrainement de particules de zinc sur une tole galvanisee - Google Patents
Procede pour eviter l'entrainement de particules de zinc sur une tole galvaniseeInfo
- Publication number
- EP1352099A1 EP1352099A1 EP02711660A EP02711660A EP1352099A1 EP 1352099 A1 EP1352099 A1 EP 1352099A1 EP 02711660 A EP02711660 A EP 02711660A EP 02711660 A EP02711660 A EP 02711660A EP 1352099 A1 EP1352099 A1 EP 1352099A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chute
- bath
- zinc
- plates
- carbon
- 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.)
- Granted
Links
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 13
- 229910052725 zinc Inorganic materials 0.000 title claims description 32
- 239000011701 zinc Substances 0.000 title claims description 32
- 239000002245 particle Substances 0.000 title claims description 21
- 229910052751 metal Inorganic materials 0.000 title claims description 10
- 239000002184 metal Substances 0.000 title claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 238000009736 wetting Methods 0.000 claims abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910001338 liquidmetal Inorganic materials 0.000 claims abstract description 15
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 17
- 229910052799 carbon Inorganic materials 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 14
- 239000000919 ceramic Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 9
- 230000001590 oxidative effect Effects 0.000 claims description 9
- 238000007667 floating Methods 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 5
- 230000001154 acute effect Effects 0.000 claims description 4
- 238000007598 dipping method Methods 0.000 claims description 4
- 229910001080 W alloy Inorganic materials 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- MGRWKWACZDFZJT-UHFFFAOYSA-N molybdenum tungsten Chemical compound [Mo].[W] MGRWKWACZDFZJT-UHFFFAOYSA-N 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims description 2
- 230000035515 penetration Effects 0.000 claims description 2
- 238000003618 dip coating Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 8
- 238000005246 galvanizing Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 150000004673 fluoride salts Chemical class 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- -1 impregnated or not Chemical compound 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
-
- 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
- C23C2/00348—Fixed work supports or guides
Definitions
- the present invention relates to a new method for avoiding or controlling the entrainment of solid compounds containing zinc, in the form of oxides and / or clods, floating on the surface of the liquid, during coating hot of a steel sheet by soaking in a galvanizing bath.
- the invention also relates to the device for implementing the method.
- Document JP-A-63 086852 proposes a method aimed at eliminating the generation of vapor and the formation of a uniform film on the surface of the bath of liquid metal.
- said surface floating solid bodies of calcium silicate, of round or spherical shape, chemically inert and not very wettable It is thus possible to isolate the liquid metal bath from the atmosphere of the continuous annealing furnace.
- This solution is however not satisfactory since, by construction, these floating bodies of the ceramic ball type are always in direct contact with the sheet, which can generate defects as well as premature wear of said balls.
- the document EP-A-0 060 225 describes a process and an installation for the coating of hot-dipped wires in vertical strand.
- the installation successively includes a pretreatment unit (cleaning, pickling, drying), a preheating unit, the coating unit proper including a vertical chute containing the molten metal and finally a cooling unit for the coated wire.
- the interior of the chute is covered with a refractory material which cannot be wetted by liquid metal.
- the lower opening for the entry of the wire into the chute is equipped with a tubular connector covered with an internal refractory sleeve which extends to the wetting line and which consists of a material which cannot be wetted by liquid metal, for example alumina.
- the object of this invention is to wrap the wire with a protective gas at the inlet and at the outlet of the chute.
- the wire to be coated in terms of product geometry, the wire to be coated, by nature one-dimensional over its length and isotropic on its section, cannot be compared to a flat product such as a two-dimensional strip (thickness ratio / width typically from 5 to 1000). Indeed, in this case, problems of flatness of the non-rigid strip arise and the cross section of passage in a chute must be perfectly controlled.
- the present invention aims to provide a chute, which by construction prevents zinc particles from accumulating at the wetting line.
- a complementary object of the invention is to provide a solution compatible with existing chutes or requiring only minor modifications thereof.
- a further complementary object of the invention is to provide a simple and inexpensive solution.
- the present invention relates to a chute, of essentially rectangular and elongated section, for the entry in the downward direction of a steel sheet previously annealed in a bath of liquid metal preferably containing zinc, in the part of a coating process by hot dipping, the entry of the bath preferably being under a reducing atmosphere, or mentally non-oxidizing for iron, said atmosphere being brought to a temperature situated in the interval defined by the temperature average of said bath ⁇ 50 ° C, characterized in that said chute is covered or protected, in whole or in part, at the level of the wetting line of the liquid metal, by means rendering its internal surface non-wettable with respect to said bath and arranged at least at each of the sides of greatest length of the chute, on either side of said sheet steel.
- said chute has a substantially rectangular section and said non-wettable means are arranged only at the side of the longer, longer length of the chute, located on the side of the steel sheet where the internal surface of said chute forms an essentially acute angle with the wetting surface.
- said means are plates based on carbon or ceramic.
- said means are plates made of a material covered with carbon, ceramic or a material not wettable by liquid zinc.
- said material not wettable by liquid zinc is a molybdenum-tungsten alloy.
- said carbon-based plates comprise graphite, sintered carbon, impregnated or not, or carbon reinforced with fibers.
- said plates are mechanically fixed to said chute directly by means of bolts.
- said plates are mechanically fixed to said chute by means of screwed or welded angles.
- said ceramic plates consist of a single piece machined in the mass or consist of several pieces assembled or fitted together.
- Another aspect of the present invention relates to a method for preventing the entrainment of particles preferably containing zinc on a steel sheet, previously annealed under a reducing atmosphere or virtually non-oxidizing for iron, in an installation coating steel by hot dipping, having an inlet chute according to the first aspect of the present invention, characterized in that it comprises a step of penetration in the downward direction of said sheet in a metal bath, preferably zinc, molten, in the presence of particles of salts or oxides of zinc or other metals, said particles floating at the wetting line during the course of the process but without adhesion either to said sheet or to the internal surface of said chute.
- Figure 1 schematically shows a sectional view of an installation of the steel galvanizing trough type, according to the state of the art.
- Figures 2. a and 2.b schematically represent the contact angle of a drop of a respectively wetting and non-wetting liquid with a horizontal flat surface.
- Figure 3. a schematically shows a sectional view of a first embodiment of steel galvanizing chute, according to the invention.
- Figure 3.b shows schematically a sectional view of a second embodiment of steel galvanizing chute, according to the invention.
- Figure 4 shows the detail of a first embodiment of the ceramic plates 1 according to the invention.
- Figure 5 shows the detail of a second embodiment of the ceramic plates 1 according to the invention.
- Figure 1 schematically shows the configuration of a conventional chute 2 for entry of a steel sheet 3 into a galvanizing bath 1.
- the internal part of the chute 5 above the wetting surface 6 is found in a generally reducing atmosphere for iron and composed for example of .hydrogen mixed with an inert gas such as nitrogen.
- the chute is always constructed of metal, for example stainless steel, for reasons of cost, implementation and assembly, as well as to guarantee the airtightness of the ambient air.
- the most commonly used material is therefore stainless steel, and in particular grade 316L, for its known resistance to attack by liquid zinc. This material, however, has the disadvantage, like any metal for that matter, of being wetted by liquid zinc.
- the chute is of elongated rectangular shape, with a length / width ratio at least greater than 2, and preferably greater than 5.
- the present invention consists in making modifications to the construction of the internal part of the chute, being located at the level of the mooring line.
- a wetting liquid is defined as being, a liquid whose contact angle ⁇ of a drop 10 with a given horizontal surface, wetted by this liquid, does not exceed 45 ° , under oxidizing and / or reducing quenching conditions for iron, even after several days of use ( Figure 2.a).
- the contact angle ⁇ is itself defined as being the angle formed, on the side of the drop 10, by the tangent T to the contact surface of the drop 10 with said wet horizontal surface (FIGS. 2. a and 2 .b).
- the microscopic particles the formation of which is inevitable due to the physico-chemistry of the process, are constantly entrained by their small size and cannot accumulate.
- the elements or plates 7 used in the invention are either based on ceramic material, that is to say a combination of oxides and / or carbides, or based on carbon compounds such as graphite and its many variants, such as sintered carbon, impregnated or not, fiber reinforced, etc.
- Carbon is a particularly advantageous material for a preferred embodiment of the invention, insofar as, in addition to being non-wettable for liquid zinc, it makes it possible to avoid oxidation -or still favor the reduction of the liquid metal at the mooring line 6. Besides the fact, possessing a reducing power well known to those skilled in the art, carbon is still anticorrosive with respect to liquid metals.
- the present invention is not limited to the examples of plates described but relates to any material not wettable by zinc that can be used (sulfides, fluorides, special alloys, etc.).
- molybdenum-tungsten alloys are not wettable by zinc.
- the atmosphere inside the chute is oxidizing for the liquid metal (while of course remaining non-oxidizing for the iron), for example in the form of an injected oxidizing gas such as wet nitrogen or hydrogen, possibly supplemented with oxygen and carbon dioxide, in order to avoid the formation of zinc vapors above the wetting line, which favor the appearance of the aforementioned defects on the sheet.
- an injected oxidizing gas such as wet nitrogen or hydrogen, possibly supplemented with oxygen and carbon dioxide
- Another characteristic of the invention is to use a mechanical fixing of said ceramic or carbon plates 7.
- This type of attachment thus allows the free expansion of the different materials relative to each other. More precisely, said attachment is for example of the screwed or welded angle type 8
- the ceramic plates can be made either in one piece with machining in the mass ( Figure 4), or in several pieces (Figure 5). These plates can be fixed against the chute or present a space with the chute, where the liquid zinc can circulate freely. They may also consist of several layers of different properties, such as for example a layer reflecting heat on one face of the plate.
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)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02711660A EP1352099B1 (fr) | 2001-01-17 | 2002-01-16 | Procede pour eviter l'entrainement de particules de zinc sur une tole galvanisee |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01870010A EP1225245A1 (fr) | 2001-01-17 | 2001-01-17 | Procédé pour éviter l'entraínement de particules de zinc sur une tole galvanisée |
EP01870010 | 2001-01-17 | ||
PCT/BE2002/000006 WO2002057505A1 (fr) | 2001-01-17 | 2002-01-16 | Procede pour eviter l'entrainement de particules de zinc sur une tole galvanisee |
EP02711660A EP1352099B1 (fr) | 2001-01-17 | 2002-01-16 | Procede pour eviter l'entrainement de particules de zinc sur une tole galvanisee |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1352099A1 true EP1352099A1 (fr) | 2003-10-15 |
EP1352099B1 EP1352099B1 (fr) | 2007-11-14 |
Family
ID=8184914
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01870010A Withdrawn EP1225245A1 (fr) | 2001-01-17 | 2001-01-17 | Procédé pour éviter l'entraínement de particules de zinc sur une tole galvanisée |
EP02711660A Expired - Lifetime EP1352099B1 (fr) | 2001-01-17 | 2002-01-16 | Procede pour eviter l'entrainement de particules de zinc sur une tole galvanisee |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01870010A Withdrawn EP1225245A1 (fr) | 2001-01-17 | 2001-01-17 | Procédé pour éviter l'entraínement de particules de zinc sur une tole galvanisée |
Country Status (5)
Country | Link |
---|---|
EP (2) | EP1225245A1 (fr) |
AT (1) | ATE378437T1 (fr) |
DE (1) | DE60223492T2 (fr) |
ES (1) | ES2294119T3 (fr) |
WO (1) | WO2002057505A1 (fr) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6058787B2 (ja) * | 1981-03-10 | 1985-12-21 | 興国鋼線索株式会社 | 線状体の高速浸漬被覆方法およびその装置 |
JPS6386852A (ja) * | 1986-09-30 | 1988-04-18 | Sumitomo Metal Ind Ltd | 連続式溶融金属めつき装置 |
JPH01294851A (ja) * | 1988-05-23 | 1989-11-28 | Kobe Steel Ltd | スナウト内ドロスの発生防止方法 |
JPH0499852A (ja) * | 1990-08-15 | 1992-03-31 | Kawasaki Steel Corp | 溶融亜鉛めっき鋼板又は合金化溶融亜鉛めっき鋼板の製造方法 |
JPH0762512A (ja) * | 1993-08-19 | 1995-03-07 | Daido Steel Co Ltd | 亜鉛−アルミニウム合金メッキにおけるスナウト内部の亜鉛蒸気量の低減方法 |
JPH07145464A (ja) * | 1993-11-24 | 1995-06-06 | Nippon Steel Corp | 溶融金属めっき方法及び装置 |
JPH07145463A (ja) * | 1993-11-24 | 1995-06-06 | Nippon Steel Corp | 溶融金属めっき方法及び装置 |
JPH07252619A (ja) * | 1994-03-11 | 1995-10-03 | Nisshin Steel Co Ltd | 鋼帯の連続溶融合金めっき装置 |
JP3492759B2 (ja) * | 1994-03-22 | 2004-02-03 | 株式会社フジコー | 溶融金属めっき浴浸漬部材 |
JP3352541B2 (ja) * | 1994-09-12 | 2002-12-03 | 川崎製鉄株式会社 | 鋼板の連続溶融亜鉛めっき方法およびその装置 |
JPH11505885A (ja) * | 1995-05-29 | 1999-05-25 | エム3デー,ソシエテ アノニム | ストリップを形成する材料よりも低い融点または液相点を有する金属または合金で金属ストリップを被膜する方法及び装置 |
-
2001
- 2001-01-17 EP EP01870010A patent/EP1225245A1/fr not_active Withdrawn
-
2002
- 2002-01-16 ES ES02711660T patent/ES2294119T3/es not_active Expired - Lifetime
- 2002-01-16 WO PCT/BE2002/000006 patent/WO2002057505A1/fr active IP Right Grant
- 2002-01-16 DE DE60223492T patent/DE60223492T2/de not_active Expired - Lifetime
- 2002-01-16 AT AT02711660T patent/ATE378437T1/de active
- 2002-01-16 EP EP02711660A patent/EP1352099B1/fr not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO02057505A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE60223492D1 (de) | 2007-12-27 |
WO2002057505A1 (fr) | 2002-07-25 |
ATE378437T1 (de) | 2007-11-15 |
ES2294119T3 (es) | 2008-04-01 |
EP1225245A1 (fr) | 2002-07-24 |
EP1352099B1 (fr) | 2007-11-14 |
DE60223492T2 (de) | 2008-11-27 |
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