EP0605379A1 - Method of casting a pasty metal - Google Patents
Method of casting a pasty metal Download PDFInfo
- Publication number
- EP0605379A1 EP0605379A1 EP93870235A EP93870235A EP0605379A1 EP 0605379 A1 EP0605379 A1 EP 0605379A1 EP 93870235 A EP93870235 A EP 93870235A EP 93870235 A EP93870235 A EP 93870235A EP 0605379 A1 EP0605379 A1 EP 0605379A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal
- injected
- finely divided
- cast
- casting
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/112—Treating the molten metal by accelerated cooling
Definitions
- the present invention relates to a method for casting a metal, in particular steel, in the pasty phase in a continuous casting ingot mold.
- the casting of a metal in the pasty phase consists in casting this metal, for example steel, at a temperature included in its solidification interval, that is to say between its liquidus and solidus temperatures.
- This casting technique has well-known advantages such as, in the case of steel, obtaining fine and homogeneous structures which reduce segregation in the cast products.
- This casting method is also called low overheating casting, as opposed to conventional casting in which the metal has a clear overheating compared to its liquidus.
- this overheating is usually of the order of 25 ° C to 35 ° C.
- argon is blown inside the hollow jet, usually with a flow rate of 5 to 25 l / min, to prevent oxidation of the metal; the lowering of the overheating is ensured by an external cooling of the intermediate nozzle.
- the object of the present invention is to propose a method making it possible to better control the residual overheating of the cast metal and to further improve the homogeneity of this metal in the ingot mold.
- a method of casting a metal in the pasty phase in which said metal is poured into a cooled hollow jet. externally between a pouring container and an ingot mold, is characterized in that a finely divided metallic material is injected into the internal volume of said hollow jet.
- This finely divided material is preferably injected in suspension in a jet of non-oxidizing gas such as a jet of argon.
- the finely divided material is advantageously very poor in oxygen, and preferably does not contain oxygen.
- a finely divided material is injected consisting of a powder of the same metal as the cast metal, for example a steel powder inside a hollow jet of steel, it results in a refinement and an increased homogenization of the steel structure, which can lead to a disappearance of the axial segregation and to obtaining very homogeneous mechanical properties.
- the quantity of finely divided metal thus injected does not exceed 1% of the weight of the cast metal.
- the injected material is a powder of a metal other than the cast metal, and capable of forming therewith a predetermined alloy.
- This variant makes it possible to manufacture metal alloys having a particularly homogeneous structure and therefore more regular mechanical properties.
- the quantity of alloy metal injected is preferably between 0.5 and 10% of the weight of the cast metal.
- the particle size of the finely divided material is less than 1000 ⁇ m depending on the nature of this material and the desired effect, with a preferred value of approximately 200 ⁇ m if it is steel powder injected. in a stream of steel.
- the pressure of the gas transporting the finely divided materials in suspension will be slightly higher than atmospheric pressure, in order to avoid any entry of air by possible interstices of the casting device.
- This pressure will however be at most equal, and preferably lower than the ferrostatic pressure which prevails at the place of arrival of the metal in the ingot mold, so as to prevent any bubbling of the gas in the metal and the risk of entry of air through the ingot mold.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
La présente invention concerne un procédé de coulée d'un métal, en particulier de l'acier, en phase pâteuse dans une lingotière de coulée continue.The present invention relates to a method for casting a metal, in particular steel, in the pasty phase in a continuous casting ingot mold.
La coulée d'un métal en phase pâteuse consiste à couler ce métal, par exemple l'acier, à une température comprise dans son intervalle de solidification, c'est-à-dire entre ses températures de liquidus et de solidus. Cette technique de coulée présente des avantages bien connus tels que, dans le cas de l'acier, l'obtention de structures fines et homogènes qui réduisent les ségrégations dans les produits coulés.The casting of a metal in the pasty phase consists in casting this metal, for example steel, at a temperature included in its solidification interval, that is to say between its liquidus and solidus temperatures. This casting technique has well-known advantages such as, in the case of steel, obtaining fine and homogeneous structures which reduce segregation in the cast products.
Cette méthode de coulée est également appelée coulée à faible surchauffe, par opposition à la coulée conventionnelle dans laquelle le métal présente une nette surchauffe par rapport à son liquidus. Pour la coulée conventionnelle de l'acier, cette surchauffe est usuellement de l'ordre de 25°C à 35°C.This casting method is also called low overheating casting, as opposed to conventional casting in which the metal has a clear overheating compared to its liquidus. For conventional steel casting, this overheating is usually of the order of 25 ° C to 35 ° C.
On connaît déjà des dispositifs de coulée d'un métal en phase pâteuse, en particulier par le brevet EP-A-0269180 relatif à la coulée en jet creux dans une busette disposée entre le panier répartiteur et la lingotière de coulée continue.Devices for casting a metal in the pasty phase are already known, in particular from patent EP-A-0269180 relating to hollow jet casting in a nozzle disposed between the distributor basket and the continuous casting mold.
Selon ce brevet, on insuffle de l'argon à l'intérieur du jet creux, usuellement avec un débit de 5 à 25 l/min, pour éviter l'oxydation du métal; l'abaissement de la surchauffe est assuré par un refroidissement externe de la busette intermédiaire.According to this patent, argon is blown inside the hollow jet, usually with a flow rate of 5 to 25 l / min, to prevent oxidation of the metal; the lowering of the overheating is ensured by an external cooling of the intermediate nozzle.
La présente invention a pour objet de proposer un procédé permettant de mieux maîtriser la surchauffe résiduelle du métal coulé et d'améliorer encore l'homogénéité de ce métal dans la lingotière.The object of the present invention is to propose a method making it possible to better control the residual overheating of the cast metal and to further improve the homogeneity of this metal in the ingot mold.
Conformément à la présente invention, un procédé de coulée d'un métal en phase pâteuse, dans lequel on coule ledit métal en un jet creux refroidi extérieurement entre un récipient de coulée et une lingotière, est caractérisé en ce que l'on injecte une matière métallique finement divisée dans le volume intérieur dudit jet creux.According to the present invention, a method of casting a metal in the pasty phase, in which said metal is poured into a cooled hollow jet. externally between a pouring container and an ingot mold, is characterized in that a finely divided metallic material is injected into the internal volume of said hollow jet.
Cette matière finement divisée est de préférence injectée en suspension dans un jet de gaz non oxydant tel qu'un jet d'argon.This finely divided material is preferably injected in suspension in a jet of non-oxidizing gas such as a jet of argon.
Pour réduire les risques d'oxydation du métal coulé, la matière finement divisée est avantageusement très pauvre en oxygène, et ne contient de préférence pas d'oxygène.To reduce the risks of oxidation of the cast metal, the finely divided material is advantageously very poor in oxygen, and preferably does not contain oxygen.
Lorsque, dans le procédé de l'invention, on injecte une matière finement divisée constituée par une poudre du même métal que le métal coulé, par exemple une poudre d'acier à l'intérieur d'un jet creux d'acier, il en résulte un affinement et une homogénéisation accrus de la structure de l'acier, qui peuvent conduire à une disparition de la ségrégation axiale et à l'obtention de propriétés mécaniques très homogènes.When, in the process of the invention, a finely divided material is injected consisting of a powder of the same metal as the cast metal, for example a steel powder inside a hollow jet of steel, it results in a refinement and an increased homogenization of the steel structure, which can lead to a disappearance of the axial segregation and to obtaining very homogeneous mechanical properties.
De préférence, la quantité de métal finement divisé ainsi injecté ne dépasse pas 1 % du poids du métal coulé.Preferably, the quantity of finely divided metal thus injected does not exceed 1% of the weight of the cast metal.
Toutefois, suivant une mise en oeuvre particulièrement intéressante, la matière injectée est une poudre d'un autre métal que le métal coulé, et susceptible de former avec celui-ci un alliage prédéterminé.However, according to a particularly advantageous implementation, the injected material is a powder of a metal other than the cast metal, and capable of forming therewith a predetermined alloy.
Cette variante permet de fabriquer des alliages métalliques présentant une structure particulièrement homogène et par conséquent des propriétés mécaniques plus régulières.This variant makes it possible to manufacture metal alloys having a particularly homogeneous structure and therefore more regular mechanical properties.
Dans ce cas, la quantité de métal d'alliage injecté est de préférence comprise entre 0,5 et 10 % du poids du métal coulé.In this case, the quantity of alloy metal injected is preferably between 0.5 and 10% of the weight of the cast metal.
Selon l'invention, la granulométrie de la matière finement divisée est inférieure à 1000 µm selon la nature de cette matière et l'effet recherché, avec une valeur préférée d'environ 200 µm s'il s'agit de poudre d'acier injectée dans un jet d'acier.According to the invention, the particle size of the finely divided material is less than 1000 μm depending on the nature of this material and the desired effect, with a preferred value of approximately 200 μm if it is steel powder injected. in a stream of steel.
D'une manière générale, la pression du gaz transportant les matières finement divisées en suspension sera légèrement supérieure à la pression atmosphérique, afin d'éviter toute entrée d'air par d'éventuels interstices du dispositif de coulée. Cette pression sera cependant au maximum égale, et de préférence inférieure à la pression ferrostatique qui règne à l'endroit d'arrivée du métal dans la lingotière, de façon à prévenir tout barbotage du gaz dans le métal et le risque d'entrée d'air par la lingotière.In general, the pressure of the gas transporting the finely divided materials in suspension will be slightly higher than atmospheric pressure, in order to avoid any entry of air by possible interstices of the casting device. This pressure will however be at most equal, and preferably lower than the ferrostatic pressure which prevails at the place of arrival of the metal in the ingot mold, so as to prevent any bubbling of the gas in the metal and the risk of entry of air through the ingot mold.
En faisant varier la quantité de matière injectée dans les limites indiquées, il est possible d'agir sur le refroidissement du métal et ainsi de régler l'abaissement de la surchauffe, compte tenu de la surchauffe initiale dans le récipient de coulée. Il est aisément possible de supprimer ainsi toute surchauffe résiduelle, et même de créer une "surchauffe négative" c'est-à-dire d'atteindre, en certains points du métal, des températures inférieures au liquidus. Il apparaît alors dans le métal des particules solidifiées, qui constituent des germes de solidification lorsque le métal se trouve dans la lingotière.By varying the quantity of material injected within the indicated limits, it is possible to act on the cooling of the metal and thus to regulate the lowering of the superheat, taking into account the initial superheat in the pouring vessel. It is therefore easily possible to suppress any residual overheating in this way, and even to create a "negative overheating", that is to say reaching, at certain points in the metal, temperatures below the liquidus. Solidified particles then appear in the metal, which constitute solidification seeds when the metal is in the mold.
Claims (6)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE9201158A BE1006567A6 (en) | 1992-12-28 | 1992-12-28 | Casting process of metal phase pasty. |
| BE9201158 | 1992-12-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0605379A1 true EP0605379A1 (en) | 1994-07-06 |
| EP0605379B1 EP0605379B1 (en) | 1997-07-09 |
Family
ID=3886617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93870235A Expired - Lifetime EP0605379B1 (en) | 1992-12-28 | 1993-12-16 | Method of casting a pasty metal |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0605379B1 (en) |
| BE (1) | BE1006567A6 (en) |
| DE (1) | DE69312037T2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1014063A3 (en) * | 2001-03-22 | 2003-03-04 | Ct De Rech S Metallurg Ass San | Continuous casting of steel with uniformly distributed fine oxides involves injecting a finely divided metallic material into the steel as it passes from the distributor into the casting mold |
| BE1017392A3 (en) * | 2006-12-12 | 2008-08-05 | Ct Rech Metallurgiques Asbl | HOLLOW JET BUSHET FOR CONTINUOUS STEEL CASTING. |
| US9004150B2 (en) | 2005-03-16 | 2015-04-14 | Centre de Recherches Metallurgiques ASBL—Centrum Voor Research in de Metallurgie VZW | Method for continuous casting of a metal with improved mechanical strength and product obtained by said method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1016550A3 (en) * | 2005-03-16 | 2007-01-09 | Ct Rech Metallurgiques Asbl | Process for casting continuous metal mechanical resistance and improved product obtained by the process. |
| PL2830793T3 (en) | 2012-03-28 | 2020-07-13 | Arcelormittal | Continuous casting equipment |
| IN2014DN08195A (en) | 2012-03-28 | 2015-05-01 | Arcelormittal Investigacion Y Desarrollo Sl |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2150591A1 (en) * | 1971-08-27 | 1973-04-13 | Air Liquide | Cooling of molten metal - by addition of particles of the same metal(s) at a considerably lower temp |
| DE2816803A1 (en) * | 1977-04-18 | 1978-10-19 | Centro Speriment Metallurg | PROCESS FOR COOLING AND ALLOYING MOLTEN STEEL DURING CONTINUOUS CASTING |
| EP0269180A2 (en) * | 1986-11-26 | 1988-06-01 | CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif | Device for casting pasty metals |
-
1992
- 1992-12-28 BE BE9201158A patent/BE1006567A6/en not_active IP Right Cessation
-
1993
- 1993-12-16 DE DE1993612037 patent/DE69312037T2/en not_active Expired - Lifetime
- 1993-12-16 EP EP93870235A patent/EP0605379B1/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2150591A1 (en) * | 1971-08-27 | 1973-04-13 | Air Liquide | Cooling of molten metal - by addition of particles of the same metal(s) at a considerably lower temp |
| DE2816803A1 (en) * | 1977-04-18 | 1978-10-19 | Centro Speriment Metallurg | PROCESS FOR COOLING AND ALLOYING MOLTEN STEEL DURING CONTINUOUS CASTING |
| EP0269180A2 (en) * | 1986-11-26 | 1988-06-01 | CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif | Device for casting pasty metals |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1014063A3 (en) * | 2001-03-22 | 2003-03-04 | Ct De Rech S Metallurg Ass San | Continuous casting of steel with uniformly distributed fine oxides involves injecting a finely divided metallic material into the steel as it passes from the distributor into the casting mold |
| US9004150B2 (en) | 2005-03-16 | 2015-04-14 | Centre de Recherches Metallurgiques ASBL—Centrum Voor Research in de Metallurgie VZW | Method for continuous casting of a metal with improved mechanical strength and product obtained by said method |
| BE1017392A3 (en) * | 2006-12-12 | 2008-08-05 | Ct Rech Metallurgiques Asbl | HOLLOW JET BUSHET FOR CONTINUOUS STEEL CASTING. |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69312037D1 (en) | 1997-08-14 |
| BE1006567A6 (en) | 1994-10-18 |
| DE69312037T2 (en) | 1998-02-12 |
| EP0605379B1 (en) | 1997-07-09 |
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