EP0869853B1 - Method for continuous thin slab metal casting - Google Patents

Method for continuous thin slab metal casting Download PDF

Info

Publication number
EP0869853B1
EP0869853B1 EP96946181A EP96946181A EP0869853B1 EP 0869853 B1 EP0869853 B1 EP 0869853B1 EP 96946181 A EP96946181 A EP 96946181A EP 96946181 A EP96946181 A EP 96946181A EP 0869853 B1 EP0869853 B1 EP 0869853B1
Authority
EP
European Patent Office
Prior art keywords
gap
mold
ratio
cross
submerged nozzle
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.)
Expired - Lifetime
Application number
EP96946181A
Other languages
German (de)
French (fr)
Other versions
EP0869853A2 (en
Inventor
Fritz-Peter Pleschiutschnigg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Demag AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP0869853A2 publication Critical patent/EP0869853A2/en
Application granted granted Critical
Publication of EP0869853B1 publication Critical patent/EP0869853B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0406Moulds with special profile

Definitions

  • the invention relates to a method for the continuous casting of thin slabs of metal according to the preamble of claim 1.
  • From DE-A-2015033 is a continuous casting mold for casting thin slabs known, with an elongated inner cross-sectional area, with cooled mold walls and a melt feed via at least one immersed in the melt Diving spout.
  • the US-PS 50 82 746 discloses specially dimensioned profile strands in which specified cross-sectional parameters must not be exceeded and the one have predetermined homogeneous crystal structure to then with a Minimum rolling effort to get the desired cross-sectional profile.
  • profile strands can be made with one or more dipping spouts be poured for melt feed. It has been shown that only the Limitation of the cross-sectional parameters and the specification of a desired one Crystal structure is not sufficient to close the profile strands without cracks and with a homogeneous crystal structure over the entire cross-section. Is too it is not sufficient in the case of an extruded profile with molded ends Flanks to choose the web width equal to the flank width, as in US Pat. No.
  • the cast strands should have a homogeneous crystal structure have the entire cross-section.
  • the invention provides that at least at the level of the pouring level and at least over part of the immersion depth of the immersion nozzle for the ratio of the gap widths S TI in the area of the immediate vicinity of the immersion nozzle and S II / 2 in the areas in which the inner surfaces the mold walls are directly opposite one another, and the following applies to the ratio of the cooling powers L TI and L II of the corresponding areas of the mold wall (1, 2): [P TI / (P II / 2)] / [L TI / L II ]> 1.
  • S TI is the gap width of the gap formed by the outer surface of the respective immersion spout and by the inner surface of the mold wall located directly adjacent.
  • S II / 2 is half the gap width of the gap formed by the inner surfaces, specifically in the areas in which the inner surfaces of the mold walls are directly adjacent to one another, in which no immersion nozzle is therefore arranged between the inner surfaces.
  • L TI and L II are the cooling capacities of the mold wall in the corresponding areas.
  • the continuous casting mold with such an internal cross-section enables it, mold powder lying on the mold level even at high Casting speeds melt evenly and together with the Slag to be removed evenly, resulting in the formation of a molten Slag-casting powder layer of the same height over the entire Internal cross-sectional area leads.
  • a layer of slag and pourable powder of the same height advantageously causes the formation of a during continuous casting even slag-casting powder layer between the mold wall and Strand surface. This allows the strand shell to slide very well on the adjust the entire mold wall and the heat of the melt or strand dissipate very evenly over the mold walls during pouring, thereby a strand shell with a very homogeneous crystal structure and without tension and forms cracks.
  • [S TI / (S II / 2)] / [L TI / L II ] over the entire immersion depth of the immersion nozzle is between 1.05 and 1.30, which means in particular the influence of the immersion nozzle wall on the heat conditions in the mold during the Casting is taken into account.
  • the dimensioning of the required internal cross section of the continuous casting mold can be simplified to the effect that [S TI / (S II / 2)]> 1, preferably [S TI / (S II / 2)] is between 1.05 and 1.30, which in turn takes into account in particular the influence of the immersion spout on the heat conditions in the mold during casting.
  • the immersion nozzle has an elongated cross section having.
  • the areas of the Broad sides are shaped relatively little to the outside.
  • the invention proposes, in particular for generating a Cross section with thickened ends (dog bone), two immersion spouts each To arrange the area of the narrow sides.
  • the immersion spouts for example, a have a substantially triangular cross section.
  • Cooling elements for example cooling tubes, are used to cool the mold walls are distributed over the mold walls per unit area so that in the corresponding range provided cooling performance is achieved.
  • Fig. 1 shows a cross section through a continuous casting mold with an elongated Internal cross-sectional area at the level of the mold level that arises during operation for casting strands.
  • the broad side mold walls 1,1 and Narrow side mold walls 2,2 are opposite each other (1-1; 2-2) arranged to form a casting room, preferably consist of copper and are provided with cooling tubes 3 to dissipate the heat.
  • the cooling pipes 3 provide thereby for a uniform heat dissipation through the mold walls 1,2 by pro Surface unit a corresponding number of cooling tubes 3 in the mold wall 1,2 is provided.
  • Fig. 1 shows that in the immediate vicinity of the immersion nozzle 4, the broad side mold walls 1, 1 are each curved outwards, in such a way that the gap 7 formed by the broad side mold walls 1, 1 and the immersion nozzle 4 has a substantially constant gap width S TI over the entire immersion depth.
  • this is achieved in that the outer surfaces 6 of the immersion spout 4 have a contour similar to that of the directly opposite inner surfaces 5 of the wide mold side walls 1. Due to the elongated shape of the immersion spout 4, the regions of the broad sides 1 opposite the immersion spout 4 have to be shaped relatively little to the outside.
  • FIG. 2 A further variant of a continuous casting mold with an internal cross-sectional area dimensioned according to the invention is shown in FIG. 2.
  • the continuous casting mold shown in FIG. also known as dog bone cross-section).
  • the outer cross section of the immersion spout 4 can be of almost any shape; in the exemplary embodiment according to FIG. 2, the immersion spout 4 has an essentially triangular outer cross section.
  • the gap 7 formed by the outer surface 6 of the immersion spout 4 and the directly opposite inner surface 5 of the mold wall is dimensioned over the entire immersion depth such that the gap width S TI is essentially constant.
  • an essentially constant gap width means that in smaller, areas, d. H. for example at the corners of the triangular Cross-section of the immersion spout 4, deviations from the required constancy the gap width can occur; the constancy of the gap width must be in this Areas should therefore only be approximately met, but should double the value do not exceed.
  • the flanks - as in the left half of FIG. 1 it can be seen that something is formed on the outside.
  • the gap width can be reduced or enlarged in both exemplary embodiments if the cooling capacity of the mold wide side wall 1 is smaller or larger in the corresponding areas in the area of the gap 7. It is crucial that the ratio of gap width (S TI or S II / 2) and cooling capacity (L TI or L II ) of the corresponding area of the mold wall 1 is constant at every point of the continuous casting mold and preferably in the range between 1.05 and 1 , 30 lies. In the exemplary embodiments, this value is 1.05.
  • the or the Submersible spouts 4 When operating the continuous casting mold according to FIG. 1 or FIG. 2, the or the Submersible spouts 4 continuously poured molten steel into the mold and the cast one Profile strand pulled off at a constant speed. While pouring with constant take-off speed is always exactly as much steel melt fed, as is withdrawn at the mold exit, reducing the amount of the setting pouring level is constant with constant renewal of itself in this Melting steel area, which additionally melts the supplied and on the mold level mold powder. Doing so the essentially constant gap width in the exemplary embodiments according to FIG. 1 and Fig. 2 for a uniform upward heat flow in all Cross-sectional areas of the continuous casting mold, so that in the area of the casting level uniform melting of the mold powder takes place, i.e.
  • Per Casting surface unit and time unit is constantly the same amount Melted casting powder. It also turns out to be constant Pull-off speed of the cast profile strand the slag-casting powder layer that forms in the casting area due to the invention
  • the internal cross-sectional shape is the same at every point on the internal cross-sectional area Height. Associated with this is a self-adjusting slag casting powder film constant thickness between the mold wall 1,2 and the melt or strand shell at all points on the strand surface.
  • the total thermal resistance results from the sum of the individual Partial thermal resistances in which the specific thermal conductivities of the successive layers (mold wall - slag / casting powder - Strand shell - melt - immersion pouring wall) with their reciprocal value.
  • the specific thermal conductivity of the slag casting powder film is approx. 1 W / Km and thus determining heat dissipation and thus cooling the strand, as experimental studies have shown.
  • constant thickness of the slag casting powder film which is formed Horizontal heat transfer into the mold over the entire length of the mold Direction evened out. Temperature differences in the border area Strand shell / mold wall are greatly reduced in this way, so that only there are low tensions in the strand shell of the cast strand, which greatly reduces the risk of cracking.
  • the walls of the continuous casting mold also become uniformly lubricated exposed to reduced wear, so that their service life is also clearly elevated.

Abstract

PCT No. PCT/DE96/02375 Sec. 371 Date Aug. 18, 1998 Sec. 102(e) Date Aug. 18, 1998 PCT Filed Dec. 3, 1996 PCT Pub. No. WO97/24196 PCT Pub. Date Jul. 10, 1997The invention relates to a process and a continuous-casting mold for casting thin slabs. The mold has an oblong inner cross-sectional area and cooled mold walls. The melt is poured in through at least one delivery nozzle which dips into the melt. To ensure that, during casting, markedly lower stresses and, as a consequence thereof, fewer cracks appear in the strand shell, at least at the casting level being established and at least over a part of the depth of immersion of the delivery nozzle, the ratio of the gap widths STI and SII/2 and the ratio of the cooling capacities LTI and LII of the mold wall are related by the equation: [STI/(SII/2)]/[LTI/LII]>1. STI is the width of the gap formed in the zone immediately surrounding the particular immersed delivery nozzle by the outer surface of the delivery nozzle and by the inner surface of the directly opposite mold wall, and SII/2 is half the width of the gap formed by the inner surfaces in the zones in which the inner surfaces of the mold walls are directly opposite each other. LTI and LII are the cooling capacities of the zones of the mold wall which form the respective gap or gap section.

Description

Die Erfindung betrifft ein Verfahren zum Stranggießen von Dünnbrammen aus Metall gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for the continuous casting of thin slabs of metal according to the preamble of claim 1.

Es ist bekannt, beim Stranggießen von Strängen mit länglichem Querschnitt die Innenquerschnittsfläche der Stranggießkokille so auszubilden, daß ein möglichst endabmessungsnaher Profilstrang durch die Stranggießkokille erzeugt wird. Dabei tritt insbesondere bei Profilträgem mit H-förmigem Querschnitt als auch bei solchen mit einem Querschnitt, bei dem die Querschnittsenden Verdickungen aufweisen ("dog bone" shaped cross-section), regelmäßig das Problem auf, daß die gegenüber der Stegbreite erweiterten und/oder verdickten Enden des Profilträgers beim endabmessungsnahen Gießen häufig Risse und Spannungen und/oder unerwünschte Kristallstrukturen aufweisen. Bei nicht endabmessungsnah gegossenen Profilsträngen sind dagegen nach dem Gießen technisch aufwendige und kostenintensive Walzprozesse zur Erzielung der gewünschten Endabmessungen erforderlich.It is known that the continuous casting of strands with an elongated cross section Form the inner cross-sectional area of the continuous casting mold so that one as possible Profile strand close to the final dimension is produced by the continuous casting mold. This occurs especially in the case of profile supports with an H-shaped cross section and also with such a cross section in which the cross section ends have thickened portions ("dog bone "shaped cross-section), regularly the problem that the opposite of the Web width extended and / or thickened ends of the profile beam at Casting close to the final dimension often involves cracks and tensions and / or have undesirable crystal structures. If not close to final dimensions cast profile strands, on the other hand, are technically complex after casting and cost-intensive rolling processes to achieve the desired final dimensions required.

Aus der DE-A-2015033 ist eine Stranggießkokille zum Gießen von Dünnbrammen bekannt, mit länglicher Innenquerschnittsfläche, mit gekühlten Kokillenwänden und einer Schmelzenzuführung über zumindest einen in die Schmleze eintauchenden Tauchausguß.From DE-A-2015033 is a continuous casting mold for casting thin slabs known, with an elongated inner cross-sectional area, with cooled mold walls and a melt feed via at least one immersed in the melt Diving spout.

Aus der DE 20 34 762 A1 ist ein Verfahren und eine Vorrichtung zum Herstellen eines dünnen Bandes bekannt, bei dem das Band in seiner Längsrichtung verlaufend eine Verdickung aufweist, die noch einen flüssigen Kern besitzt. Diese Verdickung wird dann unterhalb der Kokille durch Druckrollen zurückgedrückt. DE 20 34 762 A1 describes a method and an apparatus for producing a known thin band, in which the band running in its longitudinal direction Has thickening that still has a liquid core. This thickening will then pressed back under the mold by pressure rollers.

Die US-PS 50 82 746 offenbart speziell dimensionierte Pofilstränge, bei denen vorgegebene Querschnittsparameter nicht überschritten werden dürfen und die eine vorgegebene homogene Kristallstruktur aufweisen, um anschließend mit einem Minimum an Walzaufwand das gewünschte Querschnittsprofil zu erhalten. Derartige Profilstränge können erfahrungsgemäß mit einem oder mehreren Tauchausgüssen zur Schmelzenzuführung gegossen werden. Dabei hat sich gezeigt, daß allein die Beschränkung der Querschnittsparameter und die Vorgabe einer gewünschten Kristallstruktur nicht ausreicht, um endabmessungsnahe Profilstränge ohne Risse und mit homogener Kristallstruktur über den gesamten Querschnitt herzustellen. Auch ist es nicht ausreichend, im Falle eines Strangprofils mit an den Enden angeformten Flanken, die Stegbreite gleich der Flankenbreite zu wählen, wie in der US-PS 50 82 746 explizit vorgeschlagen; unter speziell diesen Vorgaben hergestellte Profilstränge weisen nämlich regelmäßig Risse und insbesondere im Bereich der Flanken eine ungünstigere Kristallstruktur als der Steg auf, was darauf hindeutet, daß gleichmäßige Gießbedingungen in jedem Querschnittsbereich beim Gießen mit Tauchausgüssen nicht einfach durch Einhaltung der Grenzwerte der vorgenannten Querschnittsparameter erzielbar sind.The US-PS 50 82 746 discloses specially dimensioned profile strands in which specified cross-sectional parameters must not be exceeded and the one have predetermined homogeneous crystal structure to then with a Minimum rolling effort to get the desired cross-sectional profile. Such Experience has shown that profile strands can be made with one or more dipping spouts be poured for melt feed. It has been shown that only the Limitation of the cross-sectional parameters and the specification of a desired one Crystal structure is not sufficient to close the profile strands without cracks and with a homogeneous crystal structure over the entire cross-section. Is too it is not sufficient in the case of an extruded profile with molded ends Flanks to choose the web width equal to the flank width, as in US Pat. No. 50,82 746 explicitly suggested; Profile strands specially manufactured under these specifications namely have cracks regularly and especially in the area of the flanks less favorable crystal structure than the web, suggesting that uniform Pouring conditions in every cross-sectional area when pouring with immersion nozzles not simply by adhering to the limit values of the above-mentioned cross-sectional parameters are achievable.

Es ist Aufgabe der vorliegenden Erfindung, eine Verfahren zum Stranggießen von Dünnbrammen mit länglicher Innenquerschnittsfläche, z.B. von Profilsträngen mit H-förmigem Querschnitt und vorgegebebener Stegbreite, und einer Schmelzenzuführung über zumindest einen in die Schmelze eintauchenden Tauchausguß anzugeben, bei dem während des Gießens deutlich geringere Spannungen und als Folge davon weniger Risse in der Strangschale auftreten. Darüberhinaus sollen die gegossenen Stränge eine homogene Kristallstruktur über den gesamten Querschnitt aufweisen.It is an object of the present invention to provide a method for the continuous casting of Thin slabs with an elongated inner cross-sectional area, e.g. of profile strands with H-shaped Cross section and predetermined web width, and one Melt feed via at least one immersed in the melt Specify the diving spout, which is significantly lower during casting Stresses and, as a result, fewer cracks occur in the strand shell. In addition, the cast strands should have a homogeneous crystal structure have the entire cross-section.

Die Lösung dieser Aufgabe ist erfindungsgemäß gekennzeichnet durch die im Patentanspruch 1 angegebenen Merkmale. Durch die kennzeichnenden Merkmale der Unteransprüche 2 bis 8 ist das Verfahren in vorteilhafter Weise weiter ausgestaltbar. The solution to this problem is characterized by the im Claim 1 specified features. Due to the characteristic features of subclaims 2 to 8, the method is advantageously further configurable.

Die Erfindung sieht vor, daß mindestens auf Höhe des sich einstellenden Gießspiegels und mindestens über einen Teil der Eintauchtiefe des Tauchausgusses für das Verhältnis der Spaltbreiten STI im Bereich der unmittelbaren Umgebung des Tauchausgusses und SII/2 in den Bereichen, in denen sich die Innenflächen der Kokillenwände einander unmittelbar benachbart gegenüberliegen, und für das Verhältnis der Kühlleistungen LTI und LII der entsprechenden Bereiche der Kokillenwand (1,2) gilt: [STI/(SII/2)]/[LTI/LII]>1. The invention provides that at least at the level of the pouring level and at least over part of the immersion depth of the immersion nozzle for the ratio of the gap widths S TI in the area of the immediate vicinity of the immersion nozzle and S II / 2 in the areas in which the inner surfaces the mold walls are directly opposite one another, and the following applies to the ratio of the cooling powers L TI and L II of the corresponding areas of the mold wall (1, 2): [P TI / (P II / 2)] / [L TI / L II ]> 1.

Dabei ist STI die Spaltbreite des von der Außenfläche des jeweiligen Tauchausgusses und von der Innenfläche der unmittelbar benachbart gegenüberliegenden Kokillenwand gebildeten Spalts. SII/2 ist die halbe Spaltbreite des von den Innenflächen gebildeten Spalts, und zwar in den Bereichen, in denen sich die Innenflächen der Kokillenwände einander unmittelbar benachbart gegenüberliegen, in denen also kein Tauchausguß zwischen den Innenflächen angeordnet ist. LTI und LII sind die Kühlleistungen der Kokillenwand in den entsprechenden Bereichen.S TI is the gap width of the gap formed by the outer surface of the respective immersion spout and by the inner surface of the mold wall located directly adjacent. S II / 2 is half the gap width of the gap formed by the inner surfaces, specifically in the areas in which the inner surfaces of the mold walls are directly adjacent to one another, in which no immersion nozzle is therefore arranged between the inner surfaces. L TI and L II are the cooling capacities of the mold wall in the corresponding areas.

Die Stranggießkokille mit einem derart dimensionierten Innenquerschnitt ermöglicht es, auf dem Gießspiegel aufliegendes Gießpulver auch bei hohen Gießgeschwindigkeiten gleichmäßig aufzuschmelzen und zusammen mit der Schlacke gleichmäßig abzuziehen, was zur Ausbildung einer geschmolzenen Schlacken-Gießpulver-Schicht gleicher Höhe über die gesamte Innenquerschnittsfläche führt. Eine Schlacken-Gießpulver-Schicht gleicher Höhe bewirkt vorteilhafterweise während des Stranggießens die Ausbildung einer gleichmäßigen Schlacken-Gießpulver-Schicht zwischen Kokillenwand und Strangoberfläche. Damit läßt sich ein sehr gutes Gleiten der Strangschale an der gesamten Kokillenwand einstellen und die Wärme der Schmelze bzw. des Stranges während des Gießens sehr gleichmäßig über die Kokillenwände abführen, wodurch sich eine Strangschale mit sehr homogener Kristallstruktur und ohne Spannungen und Risse ausbildet.The continuous casting mold with such an internal cross-section enables it, mold powder lying on the mold level even at high Casting speeds melt evenly and together with the Slag to be removed evenly, resulting in the formation of a molten Slag-casting powder layer of the same height over the entire Internal cross-sectional area leads. A layer of slag and pourable powder of the same height advantageously causes the formation of a during continuous casting even slag-casting powder layer between the mold wall and Strand surface. This allows the strand shell to slide very well on the adjust the entire mold wall and the heat of the melt or strand dissipate very evenly over the mold walls during pouring, thereby a strand shell with a very homogeneous crystal structure and without tension and forms cracks.

Vorteilhafterweise liegt [STI / (SII/2)] / [LTI / LII] über die gesamte Eintauchtiefe des Tauchausgusses zwischen 1,05 und 1,30, wodurch insbesondere der Einfluß der Tauchausgußwand auf die Wärmeverhältnisse in der Kokille während des Gießens berücksichtigt wird.Advantageously, [S TI / (S II / 2)] / [L TI / L II ] over the entire immersion depth of the immersion nozzle is between 1.05 and 1.30, which means in particular the influence of the immersion nozzle wall on the heat conditions in the mold during the Casting is taken into account.

Bei gleichmäßiger Kühlung der Kokillenwände läßt sich die Dimensionierung des erforderlichen Innenquerschnitts der Stranggießkokille dahingehend vereinfachen , daß [STI/(SII/2)] > 1 gilt, vorzugsweise liegt [STI/(SII/2)] zwischen 1,05 und 1,30, wodurch wiederum insbesondere der Einfluß der Tauchausgußwand auf die Wärmeverhältnisse in der Kokille während des Gießens berücksichtigt wird.With uniform cooling of the mold walls, the dimensioning of the required internal cross section of the continuous casting mold can be simplified to the effect that [S TI / (S II / 2)]> 1, preferably [S TI / (S II / 2)] is between 1.05 and 1.30, which in turn takes into account in particular the influence of the immersion spout on the heat conditions in the mold during casting.

Bei Anordnung des Tauchausgusses insbesondere im Stegbereich, wird mit der Erfindung vorgeschlagen, daß der Tauchausguß einen länglichen Querschnitt aufweist. Dadurch müssen die dem Tauchausguß gegenüberliegenden Bereiche der Breitseiten nur relativ wenig nach außen ausgeformt werden.When arranging the immersion spout, especially in the dock area, use the Invention proposed that the immersion nozzle has an elongated cross section having. As a result, the areas of the Broad sides are shaped relatively little to the outside.

Ferner wird mit der Erfindung vorgeschlagen, insbesondere zur Erzeugung eines Querschnitts mit verdickten Enden (dog bone), jeweils zwei Tauchausgüsse im Bereich der Schmalseiten anzuordnen. Von Vorteil ist es in diesem Falle hinsichtlich der Endabmessungen, wenn dabei die Tauchausgüsse beispielsweise einen im wesentlichen dreieckigen Querschnitt aufweisen.Furthermore, the invention proposes, in particular for generating a Cross section with thickened ends (dog bone), two immersion spouts each To arrange the area of the narrow sides. In this case, it is advantageous in terms of the final dimensions, if the immersion spouts, for example, a have a substantially triangular cross section.

Zur Kühlung der Kokillenwände dienen Kühlelemente, beispielsweise Kühlrohre, die über die Kokillenwände pro Flächeneinheit so verteilt angeordnet sind, daß die in dem entsprechenden Bereich vorgesehene Kühlleistung erzielt wird.Cooling elements, for example cooling tubes, are used to cool the mold walls are distributed over the mold walls per unit area so that in the corresponding range provided cooling performance is achieved.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend näher beschrieben. Es zeigen:

Fig. 1
einen Querschnitt einer Stranggießkokille bei Betrieb mit einem zentralen Tauchausguß und
Fig. 2
einen Querschnitt einer Stranggießkokille bei Betrieb mit zwei an den Schmalseiten angeordneten Tauchausgüssen mit jeweils dreieckigem Querschnitt.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it:
Fig. 1
a cross section of a continuous casting mold when operating with a central immersion nozzle and
Fig. 2
a cross section of a continuous casting mold in operation with two immersion spouts arranged on the narrow sides, each with a triangular cross section.

Fig. 1 zeigt einen Querschnitt durch eine Stranggießkokille mit länglicher Innenquerschnittsfläche auf Höhe des sich bei Betrieb einstellenden Gießspiegels zum Gießen von Strängen. Die Breitseitenkokillenwände 1,1 und die Schmalseitenkokillenwände 2,2 sind jeweils einander gegenüberliegend (1-1;2-2) unter Bildung eines Gießraums angeordnet, bestehen vorzugsweise aus Kupfer und sind mit Kühlrohren 3 zur Abführung der Wärme versehen. Die Kühlrohre 3 sorgen dabei für eine gleichmäßige Wärmeabführung über die Kokillenwände 1,2, indem pro Flächeneinheit eine entsprechende Anzahl Kühlrohre 3 in der Kokillenwand 1,2 vorgesehen ist. Bei Betrieb der in Fig. 1 dargestellten Kokille ist zur Schmelzenzuführung ein in die Schmelze eintauchender Tauchausguß 4 mit vorzugsweise länglichem Querschnitt zentral angeordnet.Fig. 1 shows a cross section through a continuous casting mold with an elongated Internal cross-sectional area at the level of the mold level that arises during operation for casting strands. The broad side mold walls 1,1 and Narrow side mold walls 2,2 are opposite each other (1-1; 2-2) arranged to form a casting room, preferably consist of copper and are provided with cooling tubes 3 to dissipate the heat. The cooling pipes 3 provide thereby for a uniform heat dissipation through the mold walls 1,2 by pro Surface unit a corresponding number of cooling tubes 3 in the mold wall 1,2 is provided. When operating the mold shown in Fig. 1 is for Melt feed with an immersion spout 4 immersed in the melt preferably elongated cross-section arranged centrally.

Fig. 1 läßt erkennen, daß im Bereich der unmittelbaren Umgebung des Tauchausgusses 4 die Breitseitenkokillenwände 1,1 jeweils nach außen gewölbt sind, und zwar so, daß der von den Breitseitenkokillenwänden 1,1 und dem Tauchausguß 4 gebildete Spalt 7 eine im wesentlichen konstante Spaltbreite STI über die gesamte Eintauchtiefe aufweist. Diese wird in dem in Fig. 1 dargestellten Ausführungsbeispiel dadurch erzielt, daß die Außenflächen 6 des Tauchausgusses 4 eine ähnliche Kontur wie die unmittelbar gegenüberliegenden Innenflächen 5 der Kokillenbreitseitenwände 1 aufweisen. Durch die längliche Form des Tauchausgusses 4 müssen die dem Tauchausguß 4 gegenüberliegenden Bereiche der Breitseiten 1 relativ wenig nach außen ausgeformt werden.Fig. 1 shows that in the immediate vicinity of the immersion nozzle 4, the broad side mold walls 1, 1 are each curved outwards, in such a way that the gap 7 formed by the broad side mold walls 1, 1 and the immersion nozzle 4 has a substantially constant gap width S TI over the entire immersion depth. In the exemplary embodiment shown in FIG. 1, this is achieved in that the outer surfaces 6 of the immersion spout 4 have a contour similar to that of the directly opposite inner surfaces 5 of the wide mold side walls 1. Due to the elongated shape of the immersion spout 4, the regions of the broad sides 1 opposite the immersion spout 4 have to be shaped relatively little to the outside.

In den übrigen Bereichen links und rechts vom Tauchausguß 4 bilden die sich unmittelbar gegenüberliegenden Innenflächen 8 der Breitseitenkokillenwände 1, also ohne dazwischenangeordnetem Tauchausguß, einen Spalt 9, dessen halbe Spaltbreite SII/2 höchstens gleich STI ist, d. h. die Spaltbreite der unmittelbar gegenüberliegenden Innenflächen 8 ist höchstens doppelt so groß wie die Spaltbreite STI des Spaltes 7.In the remaining areas to the left and right of the immersion nozzle 4, the directly opposite inner surfaces 8 of the broadside mold walls 1, i.e. without an immersion nozzle arranged in between, form a gap 9, the half gap width S II / 2 of which is at most equal to S TI , that is to say the gap width of the immediately opposite inner surfaces 8 is at most twice as large as the gap width S TI of the gap 7.

Eine weitere Variante einer Stranggießkokille mit entsprechend der Erfindung dimensionierter Innenquerschnittsfläche zeigt Fig. 2. Dabei weist die in Fig. 2 dargestellte Stranggießkokille im Bereich der Kokillenschmalseitenwände 2 eine Vergrößerung des Konkilleninnenraums auf, in dem jeweils ein Tauchausguß 4 angeordnet ist (Querschnitt mit verdickten Enden, auch als dog bone cross-section bekannt). Der Außenquerschnitt des Tauchausgusses 4 kann dabei von nahezu beliebiger Form sein; im Ausführungsbeispiel gemäß Fig. 2 weist der Tauchausguß 4 einen im wesentlichen dreieckigen Außenquerschnitt auf. Dabei ist wiederum im Bereich des Tauchausgusses 4 der von der Außenfläche 6 des Tauchausgusses 4 und der unmittelbar gegenüberliegenden Innenfläche 5 der Kokillenwand gebildete Spalt 7 über die gesamte Eintauchtiefe so dimensioniert, daß die Spaltbreite STI im wesentlichen konstant ist.A further variant of a continuous casting mold with an internal cross-sectional area dimensioned according to the invention is shown in FIG. 2. The continuous casting mold shown in FIG. also known as dog bone cross-section). The outer cross section of the immersion spout 4 can be of almost any shape; in the exemplary embodiment according to FIG. 2, the immersion spout 4 has an essentially triangular outer cross section. Again, in the area of the immersion spout 4, the gap 7 formed by the outer surface 6 of the immersion spout 4 and the directly opposite inner surface 5 of the mold wall is dimensioned over the entire immersion depth such that the gap width S TI is essentially constant.

Im mittleren Bereich der Stranggießkokille, in dem sich die Innenfläche der Kokillenbreitseitenwände einen Spalt 9 bildend unmittelbar gegenüberstehen, ist die halbe Breite SII/2 des Spaltes 9 etwas kleiner als STI; der Spalt 9 selbst ist also wiederum höchstens doppelt so groß wie die Breite STI der Spalte 7 im Bereich der Profilenden.In the central region of the continuous casting mold, in which the inner surface of the mold broad side walls directly form a gap 9, half the width S II / 2 of the gap 9 is somewhat smaller than S TI ; the gap 9 itself is again at most twice as large as the width S TI of column 7 in the region of the profile ends.

Mit im wesentlichen konstanter Spaltbreite ist in den Ausführungsbeispielen gemeint, daß in kleineren, Bereichen, d. h. beispielsweise an den Ecken des dreieckigen Querschnitts des Tauchausgusses 4, Abweichungen von der geforderten Konstanz der Spaltbreite auftreten können; die Konstanz der Spaltbreite muß in diesen Bereichen folglich nur näherungsweise erfüllt sein, sollte jedoch den doppelten Wert nicht überschreiten. Genauso können die Flanken - wie in der linken Hälfte der Fig. 1 zu erkennen ist- nach außen etwas ausgeformt sein.In the exemplary embodiments, an essentially constant gap width means that in smaller, areas, d. H. for example at the corners of the triangular Cross-section of the immersion spout 4, deviations from the required constancy the gap width can occur; the constancy of the gap width must be in this Areas should therefore only be approximately met, but should double the value do not exceed. In the same way, the flanks - as in the left half of FIG. 1 it can be seen that something is formed on the outside.

Selbstverständlich kann die Spaltbreite in beiden Ausführungsbeispielen verringert oder vergrößert werden, wenn im Bereich des Spaltes 7 die Kühlleistung der Kokillenbreitseitenwand 1 in den entsprechenden Bereichen geringer bzw. größer ist. Entscheidend ist, daß das Verhältnis von Spaltbreite (STI oder SII/2) und Kühlleistung (LTI bzw. LII) des entsprechenden Bereichs der Kokillenwand 1 an jeder Stelle der Stranggießkokille konstant ist und vorzugsweise im Bereich zwischen 1,05 und 1,30 liegt. In den Ausführungsbeispielen liegt dieser Wert bei 1,05. Of course, the gap width can be reduced or enlarged in both exemplary embodiments if the cooling capacity of the mold wide side wall 1 is smaller or larger in the corresponding areas in the area of the gap 7. It is crucial that the ratio of gap width (S TI or S II / 2) and cooling capacity (L TI or L II ) of the corresponding area of the mold wall 1 is constant at every point of the continuous casting mold and preferably in the range between 1.05 and 1 , 30 lies. In the exemplary embodiments, this value is 1.05.

Beim Betrieb der Stranggießkokille gemäß Fig. 1 oder Fig. 2 wird über den oder die Tauchausgüsse 4 ständig Stahlschmelze in die Kokille eingefüllt und der gegossene Profilstrang mit konstanter Geschwindigkeit abgezogen. Während des Gießens mit konstanter Abzugsgeschwindigkeit wird ständig genau soviel Stahlschmelze zugeführt, wie am Kokillenausgang abgezogen wird, wodurch die Höhe des sich einstellenden Gießspiegels konstant ist bei ständiger Erneuerung der sich in diesem Bereich aufhaltenden Stahlschmelze, die zusätzlich das Aufschmelzen des zugeführten und auf dem Gießspiegel aufliegenden Gießpulvers bewirkt. Dabei sorgt die im wesentlichen konstante Spaltbreite in den Ausführungsbeispielen nach Fig. 1 und Fig. 2 für einen gleichmäßig nach oben gerichteten Wärmestrom in allen Querschnittsbereichen der Stranggießkokille, so daß im Bereich des Gießspiegels ein gleichmäßiges Aufschmelzen des Gießpulvers erfolgt, d.h. pro Gießspiegeloberflächeneinheit und Zeiteinheit wird ständig die gleiche Menge Gießpulver aufgeschmolzen. Zusätzlich stellt sich bei konstanter Abzugsgeschwindigkeit des gegossenen Profilstrangs die sich bildende Schlacken-Gießpulver-Schicht im Gießspiegelbereich aufgrund der erfindungsgemäßen Innenquerschnittsform an jeder Stelle der Innenquerschnittsfläche auf die gleiche Höhe ein. Damit verbunden ist ein sich ebenfalls selbsttätig einstellender Schlacken-Gießpulver-Film konstanter Dicke zwischen der Kokillenwand 1,2 und der Schmelze bzw. Strangschale an allen Stellen der Strangoberfläche.When operating the continuous casting mold according to FIG. 1 or FIG. 2, the or the Submersible spouts 4 continuously poured molten steel into the mold and the cast one Profile strand pulled off at a constant speed. While pouring with constant take-off speed is always exactly as much steel melt fed, as is withdrawn at the mold exit, reducing the amount of the setting pouring level is constant with constant renewal of itself in this Melting steel area, which additionally melts the supplied and on the mold level mold powder. Doing so the essentially constant gap width in the exemplary embodiments according to FIG. 1 and Fig. 2 for a uniform upward heat flow in all Cross-sectional areas of the continuous casting mold, so that in the area of the casting level uniform melting of the mold powder takes place, i.e. Per Casting surface unit and time unit is constantly the same amount Melted casting powder. It also turns out to be constant Pull-off speed of the cast profile strand the slag-casting powder layer that forms in the casting area due to the invention The internal cross-sectional shape is the same at every point on the internal cross-sectional area Height. Associated with this is a self-adjusting slag casting powder film constant thickness between the mold wall 1,2 and the melt or strand shell at all points on the strand surface.

Aufgrund der speziellen Dimensionierung der Kokille und der dadurch während des Gießens sich einstellende Schlacken-Gießpulver-Film konstanter Dicke wird fortlaufend aus der Stahlschmelze im Bereich der Kokillenwände eine der Wandfläche proportionale Wärmemenge abgeführt und die Schmelze unter Bildung der Strangschale gleichmäßig abgekühlt. Der quantitative Einfluß des Schlacken-Gießpulver-Films ergibt sich unmittelbar aus dessen spezifischer Wärmeleitfähigkeit und der Dicke des sich einstellenden Films; eine konstante Dicke an der Kokillenwand 1,2 bewirkt bei gegebener Temperaturdifferenz einen konstanten Wärmewiderstand bei der Abführung der Wärmemenge aus der Schmelze durch die Kokillenwände 1,2. Der Gesamtwärmewiderstand ergibt sich aus der Summe der einzelnen Teilwärmewiderstände, in welche die spezifische Wärmeleitfähigkeiten der hintereinanderliegenden Schichten (Kokillenwand - Schlacke/Gießpulver - Strangschale - Schmelze - Tauchausgußwand) jeweils mit ihrem Kehrwert eingehen. Die spezifische Wärmeleitfähigkeit des Schlacken-Gießpulver-Films ist ca. 1 W/Km und somit für die Wärmeabfuhr und damit für die Kühlung des Stranges bestimmend, wie experimentelle Untersuchungen gezeigt haben. Mit der Erfindung wird über die konstante Dicke des sich einstellenden Schlacken-Gießpulver-Films der Wärmedurchgang in die Kokille über die gesamte Kokillenlänge in horizontaler Richtung vergleichmäßigt. Temperaturunterschiede in dem Grenzbereich Strangschale/Kokillenwand werden auf diese Weise stark verringert, so daß nur noch geringe Spannungen in der Strangschale des gegossenen Stranges vorhanden sind, was die Gefahr von Rissbildungen stark vermindert. Durch die dabei erzielte sehr gute gleichmäßige Schmierung werden die Wände der Stranggießkokille außerdem einem verringertem Verschleiß ausgesetzt, so daß sich zusätzlich deren Standzeit deutlich erhöht.Due to the special dimensioning of the mold and the resulting during the Pouring slag-casting powder film of constant thickness continuously from the molten steel in the area of the mold walls to one of the wall surfaces proportional amount of heat dissipated and the melt to form the Strand shell cooled evenly. The quantitative influence of the slag mold powder film results directly from its specific thermal conductivity and the thickness of the resulting film; a constant thickness on the mold wall 1,2 causes a constant thermal resistance at a given temperature difference when the amount of heat is removed from the melt through the mold walls 1, 2. The total thermal resistance results from the sum of the individual Partial thermal resistances in which the specific thermal conductivities of the successive layers (mold wall - slag / casting powder - Strand shell - melt - immersion pouring wall) with their reciprocal value. The specific thermal conductivity of the slag casting powder film is approx. 1 W / Km and thus determining heat dissipation and thus cooling the strand, as experimental studies have shown. With the invention constant thickness of the slag casting powder film which is formed Horizontal heat transfer into the mold over the entire length of the mold Direction evened out. Temperature differences in the border area Strand shell / mold wall are greatly reduced in this way, so that only there are low tensions in the strand shell of the cast strand, which greatly reduces the risk of cracking. Through the very good achieved The walls of the continuous casting mold also become uniformly lubricated exposed to reduced wear, so that their service life is also clearly elevated.

Claims (9)

  1. A method for continuous casting of thin slabs, with an oblong cross-sectional area, in a continuous casting mould with oblong internal cross-sectional area, with cooled mould walls and melt feed via at least one submerged nozzle immersed in the melt,
    characterised in that [STI/(SII/2)]/[LTI/LII] > 1 applies for the ratio of the gap widths STI and SII/2 and for the ratio of the cooling capacities LTI and LII of the mould wall (1, 2), at least at the level of the forming meniscus at least over part of the immersion depth of the submerged nozzle, wherein STI is the gap width of the gap (7) formed in the area of the immediate vicinity of each immersed submerged nozzle (4) by the outer surface (6) of the submerged nozzle (4) and the inner surface (5) of the directly adjacently opposing mould wall and STI/2 is half the gap width of the gap (9) formed by the inner surfaces (8) in those areas in which the inner surfaces (8) of the mould walls (1) lie directly adjacently opposite each other, and wherein LTI and LII are the cooling capacities of the areas of the mould wall (1, 2) which form the corresponding gap or gap portion.
  2. A method according to claim 1,
    characterised in that,
    for the entire immersion depth of the submerged nozzle, [STI/(SII/2)]/[LTI/LII] = 1.05 - 1.30 applies for the ratio of the gap widths STI and SII/2 and for the ratio of the cooling capacities LTI and LII of the corresponding areas of the mould wall (1,2).
  3. A method according to claim 1,
    characterised in that,
    in the case of a uniform cooling capacity through the mould wall (1, 2), the ratio of the gap widths STI and SII/2 is [STI/(SII/2)] > 1.
  4. A method according to claim 1,
    characterised in that,
    in the case of a uniform cooling capacity through the mould wall (1, 2), the ratio of the gap widths STI and SII/2 is [STI/(SII/2)] = 1.05 - 1.30.
  5. A method according to one of claims 1 to 4,
    characterised in that
    the submerged nozzle (4) has an oblong cross section at least in the area of the mouth.
  6. A method according to one of claims 1 to 4,
    characterised in that
    the submerged nozzle (4) exhibits a triangular cross section.
  7. A method according to claim 6,
    characterised in that
    a submerged nozzle (4) is arranged in the area of each of the narrow sides (2).
  8. A method according to one of the preceding claims,
    characterised in that
    the mould walls (1, 2) are provided with cooling elements (3), distributed in accordance with the cooling capacity provided.
  9. A method according to one of the preceding claims for continuous casting of shaped strands with an H-shaped cross section and predetermined web width.
EP96946181A 1995-12-27 1996-12-03 Method for continuous thin slab metal casting Expired - Lifetime EP0869853B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19549275 1995-12-27
DE19549275A DE19549275C1 (en) 1995-12-27 1995-12-27 Concasting mould for making profile sections
PCT/DE1996/002375 WO1997024196A2 (en) 1995-12-27 1996-12-03 Continuous-casting mould

Publications (2)

Publication Number Publication Date
EP0869853A2 EP0869853A2 (en) 1998-10-14
EP0869853B1 true EP0869853B1 (en) 2001-05-30

Family

ID=7781731

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96946181A Expired - Lifetime EP0869853B1 (en) 1995-12-27 1996-12-03 Method for continuous thin slab metal casting

Country Status (11)

Country Link
US (1) US6044898A (en)
EP (1) EP0869853B1 (en)
JP (1) JP3244508B2 (en)
KR (1) KR19990076748A (en)
AT (1) ATE201622T1 (en)
AU (1) AU1921097A (en)
BR (1) BR9612374A (en)
DE (2) DE19549275C1 (en)
ES (1) ES2157020T3 (en)
RU (1) RU2149074C1 (en)
WO (1) WO1997024196A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19823797A1 (en) * 1998-05-28 1999-12-09 Daimler Chrysler Ag Apparatus and method for continuous casting of workpieces

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2015033A1 (en) * 1970-03-28 1971-10-07 Demag AG, 4 lOO Duisburg Molten metal feed for continuous casting of sections
DE2034762A1 (en) * 1970-07-14 1972-01-20 Schloemann AG, 4000 Dusseldorf Thin strip continuous casting - with thick length wise extending sections
US5082746A (en) * 1990-04-20 1992-01-21 Forward Gordon E As-continuously cast beam blank and method for casting continuously cast beam blank
DE19710791C2 (en) * 1997-03-17 2000-01-20 Schloemann Siemag Ag Optimized forms of the continuous casting mold and the immersion nozzle for casting steel slabs

Also Published As

Publication number Publication date
US6044898A (en) 2000-04-04
DE19549275C1 (en) 1997-04-30
DE59607019D1 (en) 2001-07-05
RU2149074C1 (en) 2000-05-20
WO1997024196A3 (en) 1997-09-12
ES2157020T3 (en) 2001-08-01
JP3244508B2 (en) 2002-01-07
KR19990076748A (en) 1999-10-15
AU1921097A (en) 1997-07-28
BR9612374A (en) 1999-07-13
ATE201622T1 (en) 2001-06-15
EP0869853A2 (en) 1998-10-14
JP2000502953A (en) 2000-03-14
WO1997024196A2 (en) 1997-07-10

Similar Documents

Publication Publication Date Title
EP0149734B1 (en) Continuous casting mould for steel slabs
EP0323958A1 (en) Device for continuous casting of flat slabs.
DE3809416C2 (en)
AT412194B (en) IMPROVED CHOCOLATE FOR A CONTINUOUS CASTING SYSTEM AND METHOD
DE3440236A1 (en) METHOD AND DEVICE FOR CONTINUOUSLY CASTING METALS, ESPECIALLY STEEL
DE3044575C2 (en) Process and continuous casting mold for continuous horizontal continuous casting
EP0869853B1 (en) Method for continuous thin slab metal casting
DE2853867C2 (en) Process for avoiding cracks in the edge area of metal strands cast in a continuous casting mold as well as additive and device for carrying out the process
EP0972590B1 (en) Continuous casting mould
DE2426979A1 (en) CONTINUOUS CASTING PROCESS FOR CASTING BLOCKS OR STRIPS MADE OF METAL
DE3627196A1 (en) METHOD AND DEVICE FOR PRODUCING A THIN METAL SHEET DIRECTLY FROM MOLTEN METAL
EP0208890B1 (en) Process for the continuous casting of a metal strand, especially as a band or profile, and device for carrying out the process
DE2913024A1 (en) PROCESS FOR COOLING AN OSCILLATING CONTINUOUS STEEL COLLAR
EP1019208B1 (en) Mould pipe for a continuous casting mould for the continuous casting of steels, especially peritectic steels
DD143221A5 (en) CONTINUOUS CAST STEEL STRUCTURE AND METHOD OF MANUFACTURE
CH363129A (en) Process for the continuous casting of metal strands and a permanent mold for carrying out the process
DE19725435C2 (en) Method and device for the continuous casting of metal
DE19710887C2 (en) Use of a mold for the production of bars from light metal or a light metal alloy, in particular from magnesium or a magnesium alloy
EP3375544A1 (en) Horizontal strip casting installation with optimised casting belt
DE3832003A1 (en) Two-roll continuous casting machine
DE2337666A1 (en) CASTING WHEEL FOR A CONTINUOUSLY OPERATING CASTING MACHINE
DE3521778A1 (en) Method for the production of a metal strand, in particular in the form of a strip or section, by casting and an apparatus for carrying out this method
EP0141904B1 (en) Continuous casting mould
EP1445045A1 (en) Process and apparatus for continuous casting of liquid metals in particular steels
DE10253735A1 (en) Intensification of the heat transfer in continuous casting molds

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19980608

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE DE ES FR GB IT NL

17Q First examination report despatched

Effective date: 19991126

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SMS DEMAG AG

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

RTI1 Title (correction)

Free format text: METHOD FOR CONTINUOUS THIN SLAB METAL CASTING

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE DE ES FR GB IT NL

REF Corresponds to:

Ref document number: 201622

Country of ref document: AT

Date of ref document: 20010615

Kind code of ref document: T

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20010530

REF Corresponds to:

Ref document number: 59607019

Country of ref document: DE

Date of ref document: 20010705

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2157020

Country of ref document: ES

Kind code of ref document: T3

ITF It: translation for a ep patent filed

Owner name: GUZZI E RAVIZZA S.R.L.

ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20011116

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20011120

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20011203

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20011208

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20011211

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20011212

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20011220

Year of fee payment: 6

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20021203

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20021203

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20021204

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20021231

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20021231

BERE Be: lapsed

Owner name: *SMS DEMAG A.G.

Effective date: 20021231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030701

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030701

GBPC Gb: european patent ceased through non-payment of renewal fee
NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20030701

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20021204

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20051203