EP0681036A1 - Method for producing a steel strip coated with zinc by hot dipping - Google Patents
Method for producing a steel strip coated with zinc by hot dipping Download PDFInfo
- Publication number
- EP0681036A1 EP0681036A1 EP95870043A EP95870043A EP0681036A1 EP 0681036 A1 EP0681036 A1 EP 0681036A1 EP 95870043 A EP95870043 A EP 95870043A EP 95870043 A EP95870043 A EP 95870043A EP 0681036 A1 EP0681036 A1 EP 0681036A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- zinc
- coated
- magnetic
- steel strip
- 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
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
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/24—Removing excess of molten coatings; Controlling or regulating the coating thickness using magnetic or electric fields
Definitions
- the present invention relates to a method of manufacturing a steel strip coated with zinc by immersion.
- This well-known technique is interesting in particular because it acts without mechanical contact and therefore does not risk damaging the zinc coating.
- it is very sensitive to a lack of symmetry in the position or the pressure of the air knives, or to a defect in the flatness of the strip.
- it produces a fairly significant noise due to the jets of pressurized air.
- This method consists in subjecting the coated strip leaving the zinc bath, to a high frequency magnetic field, which generates in the steel strip and in the zinc coating, induced currents of phase opposite to that of the inducing currents.
- the well-known interaction between these induced currents and the inducing magnetic field creates, in the coated strip, a volume force which on the one hand stabilizes the strip and on the other hand opposes its movement of movement. This force thus has the effect of obstructing the entrainment of a part of the zinc which is still liquid and therefore of effecting the desired spinning of the strip.
- the object of the present invention is to propose a method of manufacturing a steel strip coated with zinc by immersion, which does not have the above-mentioned drawback while allowing correct magnetic spinning of the coated steel strip.
- a method of manufacturing a steel strip coated with zinc by immersion in which the coated steel strip is subjected to a magnetic wringing operation on leaving the zinc bath. in that identical induced but opposite phase induced electric currents are created in the two faces of the strip during said spinning operation, and in that the temperature of the coated strip is adjusted by varying the frequency of said induced currents.
- the frequency of the induced currents is adjusted to a value between 2 kHz and 20 kHz, depending on the thickness of the strip.
- the inducing fields penetrate deeply into the thickness of the strip and the induced currents compensate to a large extent over the thickness of the strip. This results in a strong limitation of the heating of the strip and therefore a lack of interaction between the steel strip and the zinc coating.
- the temperature of the strip generally remains lower or at most equal to the temperature of the zinc bath, for example 460 ° C.
- a relatively low frequency of the inducing currents associated with an increase in the intensity of these currents while maintaining them in phase opposition, therefore makes it possible to avoid any undesirable heating of the strip while guaranteeing a correct spinning of the zinc coating.
- This implementation is particularly advantageous for dip galvanizing, where it is advisable not to heat the zinc coating formed on the strip.
- the frequency of the induced currents is adjusted to a value greater than 20 kHz, for example between 50 kHz and 1 MHz, depending on the thickness of the strip.
- the inducing fields do not penetrate deep into the band and the induced currents are located in the surface area of the two faces of the band.
- the heart of it does not heat up.
- the two faces of the strip undergo an increase in temperature which depends on the frequency of the inducing fields.
- the use of high frequency inductive magnetic fields therefore makes it possible to operate a selective heating of the surface area of the two faces of the strip without substantially reaching the core thereof.
- This implementation is very suitable for carrying out the galvannealing operation.
- the surface heating of the strip, and therefore the degree of migration of the iron atoms can thus be adjusted without difficulty at a temperature between 460 ° C and 600 ° C, simply by varying the frequency of the inductive magnetic fields. It is thus possible to control the reaction for the formation of intermetallic compounds FeZn, which in turn conditions the iron content in the coating.
- the intensity of the inducing currents should be reduced so as not to unnecessarily increase the spin density.
- magnetic circuits are provided near the strip intended to reduce the reluctance of the path of the magnetic flux and thus improve the efficiency of the spin and possible reheating of the strip, magnetic circuits otherwise well known in the art.
- said inductive magnetic fields can be created in the immediate vicinity of the zinc bath, or even partially in this bath, in order to effect said spinning, as well as any reheating, as soon as it leaves the bath and thus act directly on the zinc entrainment by the steel strip at the surface of the bath.
- said magnetic spin of the coated strip is combined, produced by means of induced currents according to the technique which has just been described, with a pneumatic spin, carried out by means of compressed gas jets according to the conventional technique.
- These two wringing operations are preferably carried out simultaneously and in the same place, namely at the outlet of the zinc bath, the inductors being able, for example, to be arranged in or in the immediate vicinity of the lips delivering the jets of compressed gas.
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- 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
La présente invention concerne un procédé de fabrication d'une bande d'acier revêtue de zinc par immersion.The present invention relates to a method of manufacturing a steel strip coated with zinc by immersion.
On sait qu'une bande d'acier revêtue de zinc subit généralement, à sa sortie du bain de zinc en fusion, une opération d'essorage qui consiste à éliminer l'excédent de zinc afin de ne conserver sur la bande qu'un revêtement de zinc ayant l'épaisseur désirée.It is known that a strip of steel coated with zinc generally undergoes, upon leaving the bath of molten zinc, a wringing operation which consists in removing the excess of zinc so as to keep only a coating on the strip zinc with the desired thickness.
Actuellement, cette opération d'essorage est réalisée au moyen de gaz comprimé insufflé sur les deux faces de la bande sous la forme de jets plats généralement appelés couteaux d'air.Currently, this wringing operation is carried out by means of compressed gas blown on both sides of the strip in the form of flat jets generally called air knives.
Cette technique bien connue est intéressante notamment parce qu'elle agit sans contact mécanique et qu'elle ne risque donc pas d'endommager le revêtement de zinc. Elle est cependant très sensible à un manque de symétrie dans la position ou la pression des couteaux d'air, ou encore à un défaut de planéité de la bande. De plus, elle produit un bruit assez important dû aux jets d'air sous pression.This well-known technique is interesting in particular because it acts without mechanical contact and therefore does not risk damaging the zinc coating. However, it is very sensitive to a lack of symmetry in the position or the pressure of the air knives, or to a defect in the flatness of the strip. In addition, it produces a fairly significant noise due to the jets of pressurized air.
Il a déjà été proposé de remédier à ces inconvénients en réalisant l'essorage par voie magnétique. Cette méthode consiste à soumettre la bande revêtue sortant du bain de zinc, à un champ magnétique à haute fréquence, qui engendre dans la bande d'acier et dans le revêtement de zinc, des courants induits de phase opposée à celle des courants inducteurs. L'interaction bien connue entre ces courants induits et le champ magnétique inducteur crée, dans la bande revêtue, une force volumique qui d'une part stabilise la bande et d'autre part s'oppose à son mouvement de défilement. Cette force a ainsi pour effet de faire obstacle à l'entraînement d'une partie du zinc encore liquide et d'opérer dès lors l'essorage désiré de la bande.It has already been proposed to remedy these drawbacks by carrying out the spinning by magnetic means. This method consists in subjecting the coated strip leaving the zinc bath, to a high frequency magnetic field, which generates in the steel strip and in the zinc coating, induced currents of phase opposite to that of the inducing currents. The well-known interaction between these induced currents and the inducing magnetic field creates, in the coated strip, a volume force which on the one hand stabilizes the strip and on the other hand opposes its movement of movement. This force thus has the effect of obstructing the entrainment of a part of the zinc which is still liquid and therefore of effecting the desired spinning of the strip.
En pratique, la mise en oeuvre de cette technique d'essorage par induction entraîne un inconvénient important. En effet, l'utilisation d'un champ magnétique à haute fréquence peut provoquer un échauffement indésirable de la bande d'acier revêtue de zinc.In practice, the implementation of this induction spinning technique involves a significant drawback. Indeed, the use of a high frequency magnetic field can cause undesirable heating of the zinc coated steel strip.
La présente invention a pour objet de proposer un procédé de fabrication d'une bande d'acier revêtue de zinc par immersion, qui ne présente pas l'inconvénient précité tout en permettant un essorage magnétique correct de la bande d'acier revêtue.The object of the present invention is to propose a method of manufacturing a steel strip coated with zinc by immersion, which does not have the above-mentioned drawback while allowing correct magnetic spinning of the coated steel strip.
Conformément à la présente invention, un procédé de fabrication d'une bande d'acier revêtue de zinc par immersion, dans lequel on soumet la bande d'acier revêtue à une opération d'essorage magnétique à sa sortie du bain de zinc, est caractérisé en ce que l'on crée des courants électriques induits identiques mais de phase opposée dans les deux faces de la bande au cours de ladite opération d'essorage, et en ce que l'on règle la température de la bande revêtue en faisant varier la fréquence desdits courants induits.In accordance with the present invention, a method of manufacturing a steel strip coated with zinc by immersion, in which the coated steel strip is subjected to a magnetic wringing operation on leaving the zinc bath. in that identical induced but opposite phase induced electric currents are created in the two faces of the strip during said spinning operation, and in that the temperature of the coated strip is adjusted by varying the frequency of said induced currents.
Il est en effet apparu que des courants induits de phase opposée, créés par des champs magnétiques inducteurs agissant de part et d'autre de la bande, se compensent mutuellement au sein de la bande, en fonction de leur profondeur de pénétration respective. Dans des conditions de symétrie parfaite, ces courants s'annulent mutuellement dans le plan moyen de la bande. On sait par ailleurs que la profondeur de pénétration du champ magnétique inducteur dépend de la fréquence et de l'intensité de ce champ magnétique.It has indeed appeared that induced currents of opposite phase, created by inductive magnetic fields acting on either side of the strip, compensate each other within the strip, according to their respective penetration depth. Under conditions of perfect symmetry, these currents cancel each other out in the mean plane of the strip. We also know that the penetration depth of the inductive magnetic field depends on the frequency and intensity of this magnetic field.
Suivant une mise en oeuvre particulière du procédé de l'invention, on règle la fréquence des courants induits à une valeur comprise entre 2 kHz et 20 kHz, selon l'épaisseur de la bande.According to a particular implementation of the method of the invention, the frequency of the induced currents is adjusted to a value between 2 kHz and 20 kHz, depending on the thickness of the strip.
Dans cette gamme de fréquences, les champs inducteurs pénètrent profondément dans l'épaisseur de la bande et les courants induits se compensent dans une large mesure sur l'épaisseur de la bande. Il en résulte une forte limitation de l'échauffement de la bande et par conséquent une absence d'interaction entre la bande d'acier et le revêtement de zinc.In this frequency range, the inducing fields penetrate deeply into the thickness of the strip and the induced currents compensate to a large extent over the thickness of the strip. This results in a strong limitation of the heating of the strip and therefore a lack of interaction between the steel strip and the zinc coating.
Pour ces fréquences, la température de la bande reste en général inférieure ou au maximum égale à la température du bain de zinc, par exemple 460°C.For these frequencies, the temperature of the strip generally remains lower or at most equal to the temperature of the zinc bath, for example 460 ° C.
De telles fréquences relativement faibles peuvent cependant conduire à des valeurs trop basses de la force volumique nécessaire pour opérer l'essorage désiré.Such relatively low frequencies can however lead to too low values of the volume force necessary to operate the desired spin.
On propose alors d'augmenter de façon correspondante l'intensité des courants inducteurs.It is then proposed to correspondingly increase the intensity of the inducing currents.
Une fréquence relativement basse des courants inducteurs, associée à une augmentation de l'intensité de ces courants tout en les maintenant en opposition de phase, permet donc d'éviter tout échauffement indésirable de la bande tout en garantissant un essorage correct du revêtement de zinc.A relatively low frequency of the inducing currents, associated with an increase in the intensity of these currents while maintaining them in phase opposition, therefore makes it possible to avoid any undesirable heating of the strip while guaranteeing a correct spinning of the zinc coating.
Cette mise en oeuvre s'avère particulièrement intéressante pour la galvanisation au trempé, où il convient de ne pas réchauffer le revêtement de zinc formé sur la bande.This implementation is particularly advantageous for dip galvanizing, where it is advisable not to heat the zinc coating formed on the strip.
Suivant une autre mise en oeuvre du procédé de l'invention, on règle la fréquence des courants induits à une valeur supérieure à 20 kHz, comprise par exemple entre 50 kHz et 1 MHz, selon l'épaisseur de la bande.According to another implementation of the method of the invention, the frequency of the induced currents is adjusted to a value greater than 20 kHz, for example between 50 kHz and 1 MHz, depending on the thickness of the strip.
A ces niveaux de fréquences, les champs inducteurs ne pénètrent pas profondément dans la bande et les courants induits sont localisés dans la zone superficielle des deux faces de la bande. Le coeur de celle-ci ne s'échauffe pas. Par contre, les deux faces de la bande subissent une augmentation de température qui dépend de la fréquence des champs inducteurs. L'utilisation de champs magnétiques inducteurs à haute fréquence permet donc d'opérer un chauffage sélectif de la zone superficielle des deux faces de la bande sans atteindre sensiblement le coeur de celle-ci.At these frequency levels, the inducing fields do not penetrate deep into the band and the induced currents are located in the surface area of the two faces of the band. The heart of it does not heat up. On the other hand, the two faces of the strip undergo an increase in temperature which depends on the frequency of the inducing fields. The use of high frequency inductive magnetic fields therefore makes it possible to operate a selective heating of the surface area of the two faces of the strip without substantially reaching the core thereof.
Cette mise en oeuvre convient très bien à la réalisation de l'opération de galvannealing. Le chauffage superficiel de la bande, et dès lors le degré de migration des atomes de fer, peut ainsi être réglé sans difficulté à une température comprise entre 460°C et 600°C, simplement en faisant varier la fréquence des champs magnétiques inducteurs. Il est ainsi possible de contrôler la réaction de formation de composés intermétalliques FeZn, qui à son tour conditionne la teneur en fer dans le revêtement. En revanche, il convient de diminuer l'intensité des courants inducteurs afin de ne pas accroître inutilement la force volumique d'essorage.This implementation is very suitable for carrying out the galvannealing operation. The surface heating of the strip, and therefore the degree of migration of the iron atoms, can thus be adjusted without difficulty at a temperature between 460 ° C and 600 ° C, simply by varying the frequency of the inductive magnetic fields. It is thus possible to control the reaction for the formation of intermetallic compounds FeZn, which in turn conditions the iron content in the coating. On the other hand, the intensity of the inducing currents should be reduced so as not to unnecessarily increase the spin density.
En pratique, il existe plusieurs façons de produire des champs inducteurs donnant naissance à des courants induits de phase opposée dans les deux faces de la bande. La façon la plus simple consiste à disposer de part et d'autre de la bande, en position symétrique par rapport à celle-ci, deux conducteurs identiques parcourus par des courants égaux de phase opposée. Cette disposition peut cependant être plus complexe, suivant la technique des courants induits, sans sortir du cadre de la présente invention qui requiert la création de courants induits de phase opposée.In practice, there are several ways of producing inducing fields giving rise to induced currents of opposite phase in the two faces of the strip. The simplest way is to have on either side of the strip, in a position symmetrical with respect thereto, two identical conductors traversed by equal currents of opposite phase. This arrangement can however be more complex, according to the technique of induced currents, without departing from the scope of the present invention which requires the creation of induced currents of opposite phase.
Suivant une caractéristique supplémentaire on dispose, à proximité de la bande, des circuits magnétiques destinés à réduire la reluctance du parcours du flux magnétique et à améliorer ainsi l'efficacité de l'essorage et du réchauffage éventuel de la bande, circuits magnétiques par ailleurs bien connus dans la technique.According to an additional characteristic, magnetic circuits are provided near the strip intended to reduce the reluctance of the path of the magnetic flux and thus improve the efficiency of the spin and possible reheating of the strip, magnetic circuits otherwise well known in the art.
Enfin, lesdits champs magnétiques inducteurs peuvent être créés à proximité immédiate du bain de zinc, ou même partiellement dans ce bain, afin d'effectuer ledit essorage, ainsi que le réchauffage éventuel, dès la sortie du bain et d'agir ainsi directement sur l'entraînement de zinc par la bande d'acier au niveau de la surface du bain.Finally, said inductive magnetic fields can be created in the immediate vicinity of the zinc bath, or even partially in this bath, in order to effect said spinning, as well as any reheating, as soon as it leaves the bath and thus act directly on the zinc entrainment by the steel strip at the surface of the bath.
La valeur des fréquences à utiliser dans les différentes mises en oeuvre précitées sera, dans chaque cas, déterminée expérimentalement à l'aide d'une bande de référence, en tenant compte notamment de l'épaisseur et de la nature de la bande et du type de traitement à réaliser.The value of the frequencies to be used in the various abovementioned implementations will, in each case, be determined experimentally using a reference band, taking into account in particular the thickness and the nature of the band and the type of treatment to be carried out.
Suivant encore une autre caractéristique intéressante du présent procédé, on combine ledit essorage magnétique de la bande revêtue, réalisé au moyen de courants induits selon la technique qui vient d'être décrite, avec un essorage pneumatique, réalisé au moyen de jets de gaz comprimé suivant la technique conventionnelle. Ces deux opérations d'essorage sont de préférence effectuées simultanément et au même endroit, à savoir à la sortie du bain de zinc, les inducteurs pouvant par exemple être disposés dans ou à proximité immédiate des lèvres délivrant les jets de gaz comprimé.According to yet another advantageous characteristic of the present process, said magnetic spin of the coated strip is combined, produced by means of induced currents according to the technique which has just been described, with a pneumatic spin, carried out by means of compressed gas jets according to the conventional technique. These two wringing operations are preferably carried out simultaneously and in the same place, namely at the outlet of the zinc bath, the inductors being able, for example, to be arranged in or in the immediate vicinity of the lips delivering the jets of compressed gas.
Claims (8)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE9400445 | 1994-05-02 | ||
| BE9400445A BE1008252A6 (en) | 1994-05-02 | 1994-05-02 | PROCESS FOR THE MANUFACTURE OF A ZINC COATED STEEL STRIP BY IMMERSION. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0681036A1 true EP0681036A1 (en) | 1995-11-08 |
| EP0681036B1 EP0681036B1 (en) | 1998-12-09 |
Family
ID=3888132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95870043A Expired - Lifetime EP0681036B1 (en) | 1994-05-02 | 1995-04-27 | Method for producing a steel strip coated with zinc by hot dipping |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0681036B1 (en) |
| AT (1) | ATE174387T1 (en) |
| BE (1) | BE1008252A6 (en) |
| DE (1) | DE69506473D1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2754545A1 (en) * | 1996-10-10 | 1998-04-17 | Maubeuge Fer | Method and device for drying a coated metal strip |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2018482A1 (en) * | 1968-09-20 | 1970-05-29 | Asea Ab | |
| JPH0280545A (en) * | 1988-09-17 | 1990-03-20 | Sumitomo Metal Ind Ltd | Method for preventing splash of hot dipping bath |
| EP0525387A1 (en) * | 1991-06-25 | 1993-02-03 | Nkk Corporation | Method for controlling the coating weight on a hot-dip coated steel strip |
-
1994
- 1994-05-02 BE BE9400445A patent/BE1008252A6/en not_active IP Right Cessation
-
1995
- 1995-04-27 AT AT95870043T patent/ATE174387T1/en active
- 1995-04-27 DE DE69506473T patent/DE69506473D1/en not_active Expired - Lifetime
- 1995-04-27 EP EP95870043A patent/EP0681036B1/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2018482A1 (en) * | 1968-09-20 | 1970-05-29 | Asea Ab | |
| JPH0280545A (en) * | 1988-09-17 | 1990-03-20 | Sumitomo Metal Ind Ltd | Method for preventing splash of hot dipping bath |
| EP0525387A1 (en) * | 1991-06-25 | 1993-02-03 | Nkk Corporation | Method for controlling the coating weight on a hot-dip coated steel strip |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 14, no. 270 (C - 0727) 12 June 1990 (1990-06-12) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2754545A1 (en) * | 1996-10-10 | 1998-04-17 | Maubeuge Fer | Method and device for drying a coated metal strip |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE174387T1 (en) | 1998-12-15 |
| BE1008252A6 (en) | 1996-02-27 |
| EP0681036B1 (en) | 1998-12-09 |
| DE69506473D1 (en) | 1999-01-21 |
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