WO2002057504A1 - Procede de galvanisation de l'acier - Google Patents
Procede de galvanisation de l'acier Download PDFInfo
- Publication number
- WO2002057504A1 WO2002057504A1 PCT/BE2001/000199 BE0100199W WO02057504A1 WO 2002057504 A1 WO2002057504 A1 WO 2002057504A1 BE 0100199 W BE0100199 W BE 0100199W WO 02057504 A1 WO02057504 A1 WO 02057504A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- zone
- oxidizing
- atmosphere
- sheet
- liquid metal
- 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.)
- Ceased
Links
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
Definitions
- the present invention relates to a new process for hot coating a steel sheet by dipping in a bath of liquid metal, in particular containing molten zinc.
- the invention relates to the control of the Oxidoreduction of the atmosphere of the entry tube into the bath of liquid zinc, with respect to iron and liquid zinc, more specifically in the vicinity of the line mooring.
- US-A-4,557,953 proposes a process in which an atmosphere of inert gases is maintained in the proboscis, containing 1-8% hydrogen by volume in combination with 300 to 4500 ppm of vapor water.
- the H 2 / H 2 0 ratio must be at least equal to 4.
- the oxidation-reduction potential recommended in the state of the art with a view to oxidizing the surface of liquid zinc does not prevent oxidation, of the alloying elements contained in the steel such as manganese, chromium, silicon, etc. These are commonly used in the production of so-called high yield strength (HLE) hard steels.
- the Oxidoreduction potential recommended also causes excessive oxidation of the surface at the level of the wetting line inside the proboscis. This results in the formation of large clusters of zinc oxide (ZnO) which always come off, usually unpredictably.
- the present invention aims to provide a solution to the problems posed in the state of the art and in particular linked to the zinc oxidation process which is recommended therein.
- the present invention has as a particular object to reduce to the strict minimum the area in which the oxidation of liquid zinc and sheet metal alloying elements, with the exception of iron, is carried out, therefore the time of corresponding oxidation, before the strip enters the zinc bath.
- the present invention relates to a new process for hot coating a steel sheet by dipping in a bath of liquid metal, preferably containing zinc at more than 10%, using an inlet pump at the less in part under a controlled oxidizing atmosphere, characterized in that it comprises the following successive stages: - the sheet passes through the trunk at the level of a first zone, the atmosphere of which, comprising at least hydrogen and steam of water, is virtually non-oxidizing with respect to iron; this atmosphere can possibly be weakly oxidizing with respect to the liquid metal and the alloying elements of the steel constituting the sheet; the sheet passes into the trunk at a second zone, the atmosphere of which, comprising at least hydrogen and water vapor, is much more oxidizing than the atmosphere of the first zone, vis the liquid metal and the alloying elements of the steel constituting said sheet, while not being vis-à-vis the iron.
- said first zone has a partial pressure of water vapor P (H 2 0) ⁇ 264 ppm and a partial pressure ratio P (H 2 ) / P (H 2 0)> 70.
- said second zone has an H 2 content of less than 1% by volume.
- This gas contains for example a mixture of H 2 0 and H 2 , and / or of H 2 0 and N 2 , and / or of C0 2 / CO, H 2 0, H 2 and / or 0 2 .
- the oxidizing power of said gas is equivalent to the partial pressure of oxygen corresponding to a value of P (H 2 ) / P (H 2 0) or P (H 2 + CO) / P (H 2 0 + C0 2 ) between 1 and 70.
- the difference in oxidizing power, expressed in P (H 2 ) / P (H 2 0) equivalent, between said first non-oxidizing zone and said second oxidizing zone is at least a factor of 8, that is to say
- said first zone is reducing with respect to iron.
- the invention preferably relates to a process ' of hot coating of a steel sheet by dipping in a bath of liquid metal, preferably containing zinc, using an inlet tube at least partly in an atmosphere controlled oxidant, characterized in that said sheet passes through a zone under a non-oxidizing atmosphere located between a zone under a directly oxidizing atmosphere for the liquid metal, downstream, and a reduction zone of the annealing and surface preparation furnace, upstream .
- Another important aspect of the present invention relates to a device of the proboscis type under controlled atmosphere for an installation for coating a steel sheet by dipping in a bath of liquid metal, characterized in that it comprises means for perform the physical separation of the sheet metal entry zone, in the liquid metal bath, into a first non-oxidizing or reducing zone with respect to iron and in a second oxidizing zone with respect to the liquid metal but not iron.
- Figure 1 schematically shows a sectional view of an installation of the type of galvanized steel tube, according to the prior art.
- Figure 2 schematically shows a sectional view of an installation of the steel galvanizing horn type, according to the present invention.
- FIG. 1 A very schematic description of a conventional steel galvanizing tube is presented in FIG. 1.
- the steel strip 1 enters the bath zinc melt 5 at a trunk 2 and changes direction in order to go out again from the bath, at 'a bottom cylinder 3.
- the atmosphere 7 in the trunk 2 above the bath molten zinc 5 is oxidizing at least vis-à-vis zinc, but not iron.
- Clusters of zinc oxide 4 form at the level of the wetting line 6 on the interior surface of the proboscis 2.
- Figure 2 shows the schematic galvanizing installation adapted to the characteristics of the present invention.
- the present invention relates to a device for producing a bell or horn 2 in two separate sections by means of a separation zone 8, the atmospheres 9,10 corresponding respectively to the two sections, called zone 1 and zone 2, being kind different.
- the area 1 corresponds to an atmosphere "non-oxidative and 9 'zone 2 corresponds to an oxidizing atmosphere 10 vis-à-vis the liquid zinc.
- the zone 2 has an injector 12 of oxidizing gas with typically an H 2 / H 2 0 ratio, or equivalent
- zone 2 is as short as possible.
- Zone 2 has a length typically between 10 and 2000 mm and advantageously between 100 and 300 mm, in order to optimize the distribution of oxidizing gas over the width of the zone and simultaneously minimize the oxidation time of the sheet.
- the oxidation time of the substrate is thus typically 0.1 to 0.2 seconds.
- the present invention therefore makes it possible to obtain the oxidation of liquid zinc in zone 2 and at the same time to limit the time of oxidation available for the sheet before it enters the zinc bath, by the presence ' of a non-oxidizing zone 1.
- the invention consists in reducing to the strict minimum the zone in which the intentional oxidation of zinc is carried out in order to reduce the undesirable available oxidation time for the alloying elements contained in the sheet metal. steel.
- it will be possible to prevent the formation of oxide clusters at the level of the proboscis at the wetting line by protecting the internal part of the proboscis at this location by means of a reducing material, such as carbon by example.
- this reducing material makes it possible to limit as much as possible the adhesion of the boundary layer of the liquid metal to the trunk, at the level of the wetting zone, by locally preventing the oxidation of the zinc therein.
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 (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP01273287A EP1358360B1 (fr) | 2001-01-17 | 2001-11-16 | Procede de galvanisation de l'acier |
| DE60127456T DE60127456T2 (de) | 2001-01-17 | 2001-11-16 | Verfahren zum verzinken von stahl |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP01870009A EP1225244A1 (fr) | 2001-01-17 | 2001-01-17 | Procédé de galvanisation de l'acier |
| EP01870009.6 | 2001-01-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2002057504A1 true WO2002057504A1 (fr) | 2002-07-25 |
Family
ID=8184913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/BE2001/000199 Ceased WO2002057504A1 (fr) | 2001-01-17 | 2001-11-16 | Procede de galvanisation de l'acier |
Country Status (5)
| Country | Link |
|---|---|
| EP (2) | EP1225244A1 (fr) |
| AT (1) | ATE357541T1 (fr) |
| DE (1) | DE60127456T2 (fr) |
| ES (1) | ES2283377T3 (fr) |
| WO (1) | WO2002057504A1 (fr) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0172681A1 (fr) * | 1984-07-30 | 1986-02-26 | Armco Inc. | Procédé pour contrôler la vapeur de zinc dans le tube d'introduction lors d'un procédé de galvanisation de bandes d'acier |
| DE3933244C1 (en) * | 1989-10-05 | 1990-06-13 | Hoesch Stahl Ag, 4600 Dortmund, De | Continuous zinc coating appts. for coating metal strip - comprises melt alloy bath covered with hood having hydrogen, steam and inert gas atmos. and control system |
| JPH0649610A (ja) * | 1992-07-29 | 1994-02-22 | Kawasaki Steel Corp | 溶融金属の連続めっき方法および装置 |
| JPH06330271A (ja) * | 1993-05-26 | 1994-11-29 | Nippon Steel Corp | 溶融亜鉛めっき鋼板の製造方法 |
| JPH07145465A (ja) * | 1993-11-24 | 1995-06-06 | Nippon Steel Corp | 溶融金属めっき方法及び装置 |
| JPH10158797A (ja) * | 1996-11-27 | 1998-06-16 | Nippon Steel Corp | 溶融めっきにおけるスナウト内生成異物の鋼板付着防止装置 |
| EP0979879A1 (fr) * | 1998-08-13 | 2000-02-16 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Procédé de galvanisation d'une bande métallique |
| JP2000290761A (ja) * | 1999-04-06 | 2000-10-17 | Nkk Corp | 連続溶融金属めっき設備及びその使用方法 |
-
2001
- 2001-01-17 EP EP01870009A patent/EP1225244A1/fr not_active Withdrawn
- 2001-11-16 WO PCT/BE2001/000199 patent/WO2002057504A1/fr not_active Ceased
- 2001-11-16 AT AT01273287T patent/ATE357541T1/de active
- 2001-11-16 DE DE60127456T patent/DE60127456T2/de not_active Expired - Lifetime
- 2001-11-16 ES ES01273287T patent/ES2283377T3/es not_active Expired - Lifetime
- 2001-11-16 EP EP01273287A patent/EP1358360B1/fr not_active Expired - Lifetime
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0172681A1 (fr) * | 1984-07-30 | 1986-02-26 | Armco Inc. | Procédé pour contrôler la vapeur de zinc dans le tube d'introduction lors d'un procédé de galvanisation de bandes d'acier |
| DE3933244C1 (en) * | 1989-10-05 | 1990-06-13 | Hoesch Stahl Ag, 4600 Dortmund, De | Continuous zinc coating appts. for coating metal strip - comprises melt alloy bath covered with hood having hydrogen, steam and inert gas atmos. and control system |
| JPH0649610A (ja) * | 1992-07-29 | 1994-02-22 | Kawasaki Steel Corp | 溶融金属の連続めっき方法および装置 |
| JPH06330271A (ja) * | 1993-05-26 | 1994-11-29 | Nippon Steel Corp | 溶融亜鉛めっき鋼板の製造方法 |
| JPH07145465A (ja) * | 1993-11-24 | 1995-06-06 | Nippon Steel Corp | 溶融金属めっき方法及び装置 |
| JPH10158797A (ja) * | 1996-11-27 | 1998-06-16 | Nippon Steel Corp | 溶融めっきにおけるスナウト内生成異物の鋼板付着防止装置 |
| EP0979879A1 (fr) * | 1998-08-13 | 2000-02-16 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Procédé de galvanisation d'une bande métallique |
| JP2000290761A (ja) * | 1999-04-06 | 2000-10-17 | Nkk Corp | 連続溶融金属めっき設備及びその使用方法 |
Non-Patent Citations (5)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 018, no. 285 (C - 1206) 31 May 1994 (1994-05-31) * |
| PATENT ABSTRACTS OF JAPAN vol. 1995, no. 02 31 March 1995 (1995-03-31) * |
| PATENT ABSTRACTS OF JAPAN vol. 1995, no. 09 31 October 1995 (1995-10-31) * |
| PATENT ABSTRACTS OF JAPAN vol. 1998, no. 11 30 September 1998 (1998-09-30) * |
| PATENT ABSTRACTS OF JAPAN vol. 2000, no. 13 5 February 2001 (2001-02-05) * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE60127456T2 (de) | 2007-12-06 |
| EP1225244A1 (fr) | 2002-07-24 |
| EP1358360B1 (fr) | 2007-03-21 |
| DE60127456D1 (de) | 2007-05-03 |
| EP1358360A1 (fr) | 2003-11-05 |
| ES2283377T3 (es) | 2007-11-01 |
| ATE357541T1 (de) | 2007-04-15 |
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