EP1051272A1 - Device for continuous casting in vertical charge of a melting metal - Google Patents
Device for continuous casting in vertical charge of a melting metalInfo
- Publication number
- EP1051272A1 EP1051272A1 EP99973265A EP99973265A EP1051272A1 EP 1051272 A1 EP1051272 A1 EP 1051272A1 EP 99973265 A EP99973265 A EP 99973265A EP 99973265 A EP99973265 A EP 99973265A EP 1051272 A1 EP1051272 A1 EP 1051272A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bar
- bars
- continuous casting
- ingot mould
- extension
- 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
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/0401—Moulds provided with a feed head
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/053—Means for oscillating the moulds
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/059—Mould materials or platings
Definitions
- the present invention relates to a device for the continuous casting of a molten metal, in particular in the context of continuous casting under vertical load of flat steel products.
- Continuous casting is a widely used technique which allows steel to be poured directly from a casting container into a bottomless ingot mold, from which it is extracted in the form of a continuous, partially solidified strand.
- the pouring container is usually a ladle or a distribution basket; for simplicity, we will refer here, in a generic way, to a distribution basket.
- the bottom of the distribution basket is pierced with a hole with which a shutter member of known type cooperates.
- a pouring nozzle Under the bottom of the basket and coaxially to the pouring hole is fixed a pouring nozzle, which plunges freely into the upper part of the mold itself.
- This ingot mold is made of copper and is cooled with water.
- the mold is usually driven in an oscillating movement in its longitudinal direction, of an amplitude of a few millimeters, intended to prevent the sticking of the steel to its walls.
- the liquid metal flowing from the distributor basket into the ingot mold via a refractory nozzle, submerged or not under the level of liquid steel or meniscus, located in the upper part of the ingot mold creates turbulence at the surface free of steel in the form of recirculation loops or meniscus waves.
- the association of the preceding phenomenon with the fact that the solidification of the steel is initiated at the level of the meniscus, that is to say in contact with the wall of the copper ingot mold results in the appearance of defects of surface on cast products.
- This problem of surface quality is particularly acute in continuous casting of flat products, for example such as slabs, because a good number of products cast in these formats are intended for so-called "noble” applications such as sheets for bodywork or for boxes. and require a basic cast product free from surface defects.
- the steel therefore remains in the liquid state in contact with the refractory components of the riser and begins to solidify only when it comes into contact with the metal ingot mold formed of copper located below the riser.
- This last method of continuous casting of steel with a refractory riser placed above the copper ingot mold is called continuous casting under load.
- the majority of research / development work is directly inspired by the continuous casting technique with horizontal load and has the characteristic that the internal dimensions of the refractory riser are smaller than the internal dimensions of the ingot mold above which they are positioned, with the result that the walls of the extension cannot be arranged in the extension of the walls of the mold.
- the above-mentioned technique of continuous casting under vertical load, with an extension having the same internal dimensions as those of the continuous casting ingot mold, can be defined by the following elements: an extension which is constructed so that its internal walls are in alignment perfect with the internal walls of the mold; - Said refractory riser is positioned above the continuous casting ingot mold and acts as a "liquid steel tank", the riser in question having to meet mainly criteria of resistance to thermal shock; the presence of a refractory element, called a "junction" element, placed between said riser and the continuous casting mold, said junction element being positioned just above said mold and having to satisfy certain criteria of conductivity and thermal diffusivity, resistance to thermal shock, resistance to mechanical wear (contact with solidified steel) and chemical (contact with liquid steel) and machinability acceptable for its shaping; said refractory being generally in one piece and necessarily prestressed by hot shrinking in a metal frame in order to increase its resistance to cracking during its rise in thermal regime at the start of casting; Argon is injected between the continuous copper
- the ingot molds for slabs are, in contrast to the ingot molds for billets, characterized by large dimensions, for example 200 x 2400 mm2, by rectangular sections whose ratio of the long side to the short side is greater than 2, and by an assembly into 4 plates which are mechanically pressed into contact with each other, the 2 small faces being sandwiched between the two large faces.
- the aforementioned dimensional characteristics of the molds for continuous casting under vertical load of slabs no longer allow the technology defined in the case of continuous casting under vertical load to be used for the preparation of the junction element. billet format. Given the configuration of the components, it is no longer possible to heat shrink in a metal frame to secure one-piece refractories, a technique which makes it possible to increase the resistance to cracking of said junction element during its rise in thermal regime at the start. of casting.
- the device of the present invention has the advantage that its implementation in the context of continuous casting under vertical load of slabs makes it possible: to avoid cracking of the refractory component of the junction element during impact thermal start of casting; ensuring proper alignment of said junction element on the walls of the mold; to ensure that said junction element is kept in good position throughout the casting; - Use a minimum of material in order to limit the cost of developing said joining element.
- the device explained below ensures the aforementioned advantages and therefore provides a solution to continuous casting under vertical load of slabs with an extension of the same internal dimensions as the copper ingot mold.
- a device for the continuous casting under vertical load of a molten metal in the form of slabs, using a copper ingot mold which is extended by an extension made of a refractory material, said extension being positioned. above said ingot mold so that the level of liquid steel, or meniscus, is located during the continuous casting operation in the above-mentioned refractory riser and no longer in the copper ingot mold proper, is characterized in that it comprises a refractory junction element disposed between said copper ingot mold and the above refractory brace, in that said junction element consists of at least four elongated elements, hereinafter called bars, said elements being positioned so that their assembly defines a junction element with an interior shape identical to that of the ingot and whose inner faces are the extension of the corresponding inner faces of the mold and in that the product of the width of the cube bar multiplied by the height of said bar and divided by the cube length of said bar is less than or equal to 0.025 mm, that is to say (
- the bars have the envelope surface of a parallelepiped shape and the section of a bar has a ratio of the height to the width of between 0.3 and 2.0.
- a section of each bar is preferably chosen so that it has a height to width ratio close to 0 , 5 and this in order to optimize the ability to withstand thermal shock.
- the height on the one hand must not be too low so that the solidified skin of the slab which "rises" relative to the ingot mold during the oscillation cycle, does not damage the upper refractory part of the riser which is mechanically less resistant than the joining element, and on the other hand, said height must not be too high so as not to represent an exaggerated cost in refractory material consumed for the production of said joining element.
- each bar is pressed against a rear stop which has the function of positioning it in perfect alignment, apart from the mechanical assembly clearances, with the face of the mold of which it is the extension and to prevent the bar from being pushed back by the slab.
- each bar is machined, for example provided with a hooking groove, to receive a retaining clamp, the latter ensuring the dual function of, on the one hand, vertically press the bar so that it remains in contact with the upper edge of the mold during the latter's oscillating movement, and secondly, to prevent the bar from deviating from the alignment of the face of the mold which it extends by moving towards the center of the slab, possibly does not fall into the steel during the start of the continuous casting operation.
- Another non-negligible aspect is linked to the working conditions of said junction element.
- the upper face of the copper ingot mold on which comes s' is coated with a thin film of boron nitride (BN) support the connecting element formed by bars.
- BN boron nitride
- a thin layer of graphite paper is interposed between the retaining clam and the upper face of the bar on which the clam acts.
- an alumina with a SiAION binder is used as material for making a bar. fine-grained ( ⁇ 0.1 mm).
- FIG. 1 is a schematic representation, without particular scale, in which only the elements necessary for the understanding of the invention have been reproduced.
- FIG. 1 is a schematic representation, without particular scale, in which only the elements necessary for the understanding of the invention have been reproduced.
- we deliberately omitted to draw certain elements we deliberately omitted to draw certain elements, and on the other hand, we represented the joining element by dissociating certain bars.
- Figure 1 is a perspective view schematically showing a junction element formed of bars disposed between a mold (1) for continuous casting of slabs and a riser (2) in the context of the continuous casting process with risers so that the level liquid steel or meniscus (S) is located in the riser (2), both said mold (1) and the riser (2) being simply sketched in broken lines in order to indicate their relative positions relative to the element junction, without complicating and overloading Figure 1.
- the joining element is formed by bars (3), (4), (5), (6), (7) and (8) which are arranged above the mold (5). Said bars are held in place respectively by clamps (9), (10), (1 1) which are supported in the grooves (R) machined in the various bars, the other clamps not having been shown for the purpose of simplification and better understanding of the drawing.
- clamps (9), (10), (1 1) which are supported in the grooves (R) machined in the various bars, the other clamps not having been shown for the purpose of simplification and better understanding of the drawing.
- the implementation device of the invention therefore makes it possible to obtain, by a continuous casting operation under vertical load, steel slabs which have excellent surface condition and very good internal health, thus meeting the criteria necessary for noble applications such as body sheets and beverage cans.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE9800881 | 1998-12-08 | ||
BE9800881A BE1012325A3 (en) | 1998-12-08 | 1998-12-08 | Device for continuous casting in vertical load of metal fusion. |
PCT/BE1999/000148 WO2000033991A1 (en) | 1998-12-08 | 1999-11-16 | Device for continuous casting in vertical charge of a melting metal |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1051272A1 true EP1051272A1 (en) | 2000-11-15 |
EP1051272B1 EP1051272B1 (en) | 2003-06-25 |
Family
ID=3891559
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99973265A Expired - Lifetime EP1051272B1 (en) | 1998-12-08 | 1999-11-16 | Device for continuous casting in vertical charge of a melting metal |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1051272B1 (en) |
JP (1) | JP2002531273A (en) |
KR (1) | KR20010040757A (en) |
BE (1) | BE1012325A3 (en) |
DE (1) | DE69909052T2 (en) |
WO (1) | WO2000033991A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI114540B (en) | 2001-12-28 | 2004-11-15 | Outokumpu Oy | Device for continuous casting of metal strips |
BE1014604A3 (en) * | 2002-02-05 | 2004-01-13 | Ct Rech Metallurgiques Asbl | IMPROVED DEVICE FOR MANUFACTURING FLAT PRODUCTS BY CONTINUOUS CASTING IN VERTICAL LOAD OF A FUSED METAL. |
DE102007043386B4 (en) | 2007-09-12 | 2014-02-13 | Gautschi Engineering Gmbh | Mold for continuous casting of metal and method for producing such a mold |
CN104588606B (en) * | 2014-12-31 | 2016-09-07 | 青海大学 | A kind of large aluminum alloy slab ingot casts preventing mean and the method for longitudinal cracking continuously |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO115409B (en) * | 1963-06-07 | 1968-09-30 | Aluminum Co Of America | |
FR2690099B1 (en) * | 1992-04-16 | 1997-05-23 | Pechiney Aluminium | PROCESS FOR CASTING IN LOAD TO AVOID CRACKING OF THE BOOSTER. |
FR2747060B1 (en) * | 1996-04-05 | 1998-06-12 | Ugine Savoie Sa | CONTINUOUS CASTING PROCESS FOR METALS AND CASTING PLANT FOR IMPLEMENTING SAME |
FR2747061B1 (en) * | 1996-04-05 | 1998-04-30 | Ugine Savoie Sa | BI-MATERIAL LINGOTIERE FOR CONTINUOUS CASTING IN VERTICAL METAL LOAD |
-
1998
- 1998-12-08 BE BE9800881A patent/BE1012325A3/en not_active IP Right Cessation
-
1999
- 1999-11-16 WO PCT/BE1999/000148 patent/WO2000033991A1/en not_active Application Discontinuation
- 1999-11-16 EP EP99973265A patent/EP1051272B1/en not_active Expired - Lifetime
- 1999-11-16 KR KR1020007008645A patent/KR20010040757A/en not_active Application Discontinuation
- 1999-11-16 JP JP2000586472A patent/JP2002531273A/en active Pending
- 1999-11-16 DE DE69909052T patent/DE69909052T2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0033991A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE69909052D1 (en) | 2003-07-31 |
WO2000033991A1 (en) | 2000-06-15 |
KR20010040757A (en) | 2001-05-15 |
BE1012325A3 (en) | 2000-09-05 |
EP1051272B1 (en) | 2003-06-25 |
JP2002531273A (en) | 2002-09-24 |
DE69909052T2 (en) | 2004-04-29 |
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