EP0137315B1 - Process and apparatus for the manufacture of high-purity alloys - Google Patents

Process and apparatus for the manufacture of high-purity alloys Download PDF

Info

Publication number
EP0137315B1
EP0137315B1 EP84110654A EP84110654A EP0137315B1 EP 0137315 B1 EP0137315 B1 EP 0137315B1 EP 84110654 A EP84110654 A EP 84110654A EP 84110654 A EP84110654 A EP 84110654A EP 0137315 B1 EP0137315 B1 EP 0137315B1
Authority
EP
European Patent Office
Prior art keywords
melt
crucible
melting
casting
container
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
Application number
EP84110654A
Other languages
German (de)
French (fr)
Other versions
EP0137315A2 (en
EP0137315A3 (en
Inventor
Jürgen Dr.-Ing. Hartwig
Johannes Jachowski
Paul Dipl.-Ing. Pant
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.)
Fried Krupp AG
Original Assignee
Fried Krupp 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6210057&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0137315(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Fried Krupp AG filed Critical Fried Krupp AG
Priority to AT84110654T priority Critical patent/ATE34775T1/en
Publication of EP0137315A2 publication Critical patent/EP0137315A2/en
Publication of EP0137315A3 publication Critical patent/EP0137315A3/en
Application granted granted Critical
Publication of EP0137315B1 publication Critical patent/EP0137315B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/15—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using vacuum

Definitions

  • the starting material forming the alloy is melted in an induction crucible, subjected to a vacuum treatment and then poured into a resistance-heated casting funnel, from which it is poured to form a certain metallostatic height and z. B. passes through a spray system into a spray chamber.
  • ceramic particles from the lining of the induction crucible and slag particles - the latter also when the pouring funnel flows empty - can get into the atomization chamber - especially in the initial phase of the pouring, in which there is still no metallostatic height in the pouring funnel.
  • the liquid material reacts with the lining of the pouring funnel to form further impurities which also end up in the end product.
  • a method and a device for producing metallurgical products in which or in which an alloy melts in an induction furnace located in a vacuum chamber arrangement and within the vacuum chamber arrangement possibly via a tilting ladle onto a Gutter arrangement is given, from which it is possibly poured through the closable bottom outlet of the ladle of a mobile trolley by a plug.
  • the alloy in the ladles and on the tundish arrangement is heated by electron beams arranged above it in order to keep it flowable and pourable. In the ladles, however, there is only an energy supply from the surface.
  • the invention is based on the object of specifying a method for producing high-purity alloys, the use of which improves the degree of purity of the alloy and can be maintained throughout the entire casting phase. Furthermore, an installation for carrying out the method is to be created.
  • melt located in the second crucible therefore has a higher degree of purity than the conditions in the induction crucible. Since the enrichment of the non-metallic impurities is already on the surface of the melt before it flows out through the pouring opening below, a high-purity alloy material flows from the beginning of the opening. By timely actuation of the closing arrangement, the outflow of the non-metallic impurities can be prevented and the high degree of purity can thus be maintained over the entire casting phase.
  • the system comprises an induction melting crucible 1, which is housed in a vacuum vessel 2.
  • a resistance-heated melting furnace 3 which has an outflow nozzle 4 in its bottom.
  • the melting furnace 3 is assigned a closing arrangement 5, which has a stopper rod 6, which is inserted from above through a vacuum guide 7 into the vacuum vessel 2 and can be operated by a control device 8.
  • the plug rod 6 is provided with a casing and / or coating 9.
  • the part of the sealing rod 6 located above the casing, the vacuum guide 7 and / or the control device 8 can be connected to a cooling system (not shown) in order to keep harmful thermal influences as low as possible.
  • nozzles 10 which point into the interior of the melting furnace 3 and which are connected to an inert gas line (not shown) on the outside.
  • the stopper rod 6 has nozzles 11 directed laterally into the cavity of the melting furnace 3 and a nozzle 12 directed in the direction of the outflow nozzle 4.
  • the nozzles 11 and 12 are connected to an inert gas supply (not shown).
  • a spraying chamber 13 which has at its upper end a spraying arrangement 14 located exactly below the outflow nozzle 4.
  • the starting material is first introduced into the induction crucible 1.
  • the alloy is used to set the required casting temperature and for refining treatment, ie to remove all non-metallic impurities due to density Buoyancy and transferred to the setting of the casting temperature in the resistance-heated melting furnace 3.
  • the density-related buoyancy of the non-metallic impurities can be supported by the inert gas that passes through the nozzles 10 and / or 11 into the melt.
  • the melt is kept at a constant casting temperature for the duration of the refining treatment.
  • the stopper rod 6 is raised by actuating the control device 8 and the outflow nozzle 4 is thereby opened.
  • the inert gas jet emerging through the nozzle 12 can be used to support the atomization of the alloy stream flowing into the atomization chamber 13.
  • the resistance-heated melting furnace 3 can be used for casting the alloy in the form, block and continuous casting process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Furnace Details (AREA)

Abstract

Process and system for the production of very pure alloys. The starting materials are first melted and vacuum treated in an induction crucible inside a vacuum melt system, and then are poured into a second melt crucible, and there brought to casting temperature and held there. An opening beneath the melt in the second melt crucible is used for pouring out the melt. The system for carrying out the process comprises a vacuum melt crucible assembly containing an induction melt crucible and a second melt crucible. The second melt crucible has an orifice in its lower area which is operated by a sealing arrangement. A chamber is arranged underneath the second melt crucible.

Description

Bei einem bekannten Verfahren wird das die Legierung bildende Ausgangsmaterial in einem Induktionstiegel erschmolzen, einer Vakuumbehandlung unterzogen und anschließend in einen widerstandsbeheizten Gießtrichter abgegossen, aus dem es unter Bildung einer bestimmten metallostatischen Höhe abgegossen und z. B. durch ein Verdüsungssystem in eine Verdüsungskammer gelangt. Bei diesem Verfahren können - insbesondere in der Anfangsphase des Abgießens, in der sich noch keine metallostatische Höhe im Gießtrichter eingestellt hat - keramische Teilchen der Auskleidung des Induktionstiegels und Schlackenteilchen - letztere auch beim Leerfließen des Gießtrichers - in den Verdüsungsraum gelangen. Weiterhin besteht bei diesem Verfahren die Gefahr, daß das flüssige Material mit der Auskleidung des Gießtrichters unter Bildung weiterer Verunreinigungen reagiert, die mit in das Endprodukt gelangen.In a known process, the starting material forming the alloy is melted in an induction crucible, subjected to a vacuum treatment and then poured into a resistance-heated casting funnel, from which it is poured to form a certain metallostatic height and z. B. passes through a spray system into a spray chamber. With this method, ceramic particles from the lining of the induction crucible and slag particles - the latter also when the pouring funnel flows empty - can get into the atomization chamber - especially in the initial phase of the pouring, in which there is still no metallostatic height in the pouring funnel. Furthermore, there is a risk with this method that the liquid material reacts with the lining of the pouring funnel to form further impurities which also end up in the end product.

Es ist auch bekannt, das die Legierung bildende Ausgangsmaterial in einem Induktionstiegel mit einer im Boden angeordneten Ausflußöffnung zu erschmelzen, wobei die Bodenöffnung durch eine entsprechende Stopfenanordnung verschließbar ist. Bei diesem Verfahren bleiben zwar die Schlackenteilchen weitgehend an der Oberfläche der Schmelze, es besteht jedoch die Gefahr, daß die Verschließanordnung sowohl bei der Beschickung des Tiegels mit dem festen Ausgangsmaterial beschädigt wird, als auch, daß die dichtenden Flächen der Verschließanordnung, d. h. sowohl des schließenden Teils als auch der Ausgußöffnung, bei der ständig im Induktionstiegel erzeugten Durchwirbelung der Schmelze erodiert werden.It is also known to melt the starting material forming the alloy in an induction crucible with an outflow opening arranged in the bottom, the bottom opening being closable by a corresponding plug arrangement. With this method, the slag particles remain largely on the surface of the melt, but there is a risk that the sealing arrangement will be damaged both when the crucible is loaded with the solid starting material and that the sealing surfaces of the sealing arrangement, i.e. H. both the closing part and the pouring opening, in which the swirling of the melt continuously generated in the induction crucible is eroded.

Weiterhin ist aus der FR-A-2 005 441 ein Verfahren und eine Vorrichtung zum Herstellen metallurgischer Erzeugnisse bekannt, bei dem bzw. in der eine Legierung in einem in einer Vakuumkammeranordnung befindlichen Induktionsofen erschmolzen und innerhalb der Vakuumkammeranordnung ggf. über eine kippbare Gießpfanne auf eine Gießrinnenanordnung gegeben wird, von der es ggf. durch den durch einen Stopfen verschließbaren bodenseitigen Auslaß der Gießpfanne eines fahrbaren Gießwagens vergossen wird. Dabei wird die Legierung in den Gießpfannen und auf der Gießrinnenanordnung durch darüber angeordnete Elektronenstrahler beheizt, um sie fließ- und gießfähig zu halten. In den Gießpfannen ergibt sich dabei aber nur eine Energiezufuhr von der Oberfläche her.Furthermore, from FR-A-2 005 441 a method and a device for producing metallurgical products is known, in which or in which an alloy melts in an induction furnace located in a vacuum chamber arrangement and within the vacuum chamber arrangement possibly via a tilting ladle onto a Gutter arrangement is given, from which it is possibly poured through the closable bottom outlet of the ladle of a mobile trolley by a plug. The alloy in the ladles and on the tundish arrangement is heated by electron beams arranged above it in order to keep it flowable and pourable. In the ladles, however, there is only an energy supply from the surface.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Herstellen von hochreinen Legierungen anzugeben, bei dessen Anwendung der Reinheitsgrad der Legierung verbessert wird und durchgehend über die ganze Gießphase einhaltbar ist. Weiter soll eine Anlage zum Durchführen des Verfahrens geschaffen werden.The invention is based on the object of specifying a method for producing high-purity alloys, the use of which improves the degree of purity of the alloy and can be maintained throughout the entire casting phase. Furthermore, an installation for carrying out the method is to be created.

Diese Aufgabe wird durch die im Anspruch 1 gekennzeichneten Merkmale gelöst. Während durch die von dem Induktionstiegel in der Schmelze erzeugte Durchwirbelung ständig die zur Vakuumbehandlung erwünschte Bewegung des Schmelzbades vorhanden ist, wird das Material in dem weiterenThis object is achieved by the features characterized in claim 1. While the swirl generated by the induction crucible in the melt constantly provides the movement of the melt bath desired for the vacuum treatment, the material becomes further

Schmelztiegel strömungsmäßig in Ruhe gehalten. Dadurch können die nichtmetallischen Verunreinigungen, ihrem Auftrieb entsprechend, an die Oberfläche gelangen und dort verbleiben. Die in dem zweiten Schmelztiegel befindliche Schmelze erfährt also gegenüber den Bedingungen im Induktionstiegel einen höheren Reinheitsgrad. Da sich die Anreicherung der nichtmetallischen Verunreinigungen bereits vor dem Abfließen durch die unten gelegene Ausgußöffnung an der Oberfläche der Schmelze befindet, fließt vom Beginn des Öffnens an ein hochreines Legierungsmaterial. Durch rechtzeitiges Betätigen der Verschließanordnung kann das Ausfließen der nichtmetallischen Verunreinigungen verhindert und so der hohe Reinheitsgrad über die ganze Gießphase eingehalten werden.Melting crucible kept at rest in terms of flow. As a result, the non-metallic impurities, depending on their buoyancy, can reach the surface and remain there. The melt located in the second crucible therefore has a higher degree of purity than the conditions in the induction crucible. Since the enrichment of the non-metallic impurities is already on the surface of the melt before it flows out through the pouring opening below, a high-purity alloy material flows from the beginning of the opening. By timely actuation of the closing arrangement, the outflow of the non-metallic impurities can be prevented and the high degree of purity can thus be maintained over the entire casting phase.

Durch die Maßnahme nach dem Nebenanspruch, dem Anspruch 2, kann der Reinheitsgrad noch günstiger gestaltet werden. Die Unteransprüche, die Ansprüche 3 bis 12, stellen eine vorteilhafte Anlage zur Durchführung des erfindungsgemäßen Verfahrens dar.The measure according to the secondary claim, claim 2, the degree of purity can be made even cheaper. The subclaims, claims 3 to 12, represent an advantageous system for carrying out the method according to the invention.

Als ein Ausführungsbeispiel des Gegenstandes der Erfindung ist in der Zeichnung eine Anlage zum Inertgasverdüsen von Legierungspulver schematisch dargestellt, die im folgenden näher beschrieben wird. Die Anlage umfaßt einen Induktionsschmelztiegel 1, der in einem Vakuumkessel 2 untergebracht ist. In dem Vakuumkessel befindet sich außerdem ein widerstandsbeheizter Schmelzofen 3, der in seinem Boden eine Ausflußdüse 4 aufweist. Dem Schmelzofen 3 ist eine Verschließanordnung 5 zugeordnet, die eine Stopfenstange 6 aufweist, die von oben her durch eine Vakuumführung 7 in den Vakuumkessel 2 eingeführt ist und von einer Regelvorrichtung 8 bedient werden kann. An ihrem unteren Ende ist die Stopfenstange 6 mit einer Ummantelung und/oder Beschichtung 9 versehen.As an embodiment of the subject of the invention, a plant for the inert gas atomization of alloy powder is schematically shown in the drawing, which is described in more detail below. The system comprises an induction melting crucible 1, which is housed in a vacuum vessel 2. In the vacuum vessel there is also a resistance-heated melting furnace 3, which has an outflow nozzle 4 in its bottom. The melting furnace 3 is assigned a closing arrangement 5, which has a stopper rod 6, which is inserted from above through a vacuum guide 7 into the vacuum vessel 2 and can be operated by a control device 8. At its lower end, the plug rod 6 is provided with a casing and / or coating 9.

Der oberhalb der Ummantelung befindliche Teil der Verschlußstange 6, die Vakuumführung 7 und/ oder die Regelvorrichtung 8 können, um schädliche thermische Einflüsse möglichst gering zu halten, an ein (nicht dargestelltes) Kühlsystem angeschlossen sein.The part of the sealing rod 6 located above the casing, the vacuum guide 7 and / or the control device 8 can be connected to a cooling system (not shown) in order to keep harmful thermal influences as low as possible.

Im unteren Bereich des Schmelzofens 3 sind Düsen 10 angeordnet, die in das Innere des Schmelzofens 3 weisen und die nach außen an eine (nicht dargestellte) Inertgasleitung angeschlossen sind.In the lower region of the melting furnace 3 there are nozzles 10 which point into the interior of the melting furnace 3 and which are connected to an inert gas line (not shown) on the outside.

Die Stopfenstange 6 weist an ihrem unteren Ende seitlich in den Hohlraum des Schmelzofens 3 gerichtete Düsen 11 sowie eine in Richtung der Ausflußdüse 4 gerichtete Düse 12 auf. Die Düsen 11 und 12 sind an eine (nicht dargestellte) Inertgaszuführung angeschlossen.At its lower end, the stopper rod 6 has nozzles 11 directed laterally into the cavity of the melting furnace 3 and a nozzle 12 directed in the direction of the outflow nozzle 4. The nozzles 11 and 12 are connected to an inert gas supply (not shown).

Unterhalb der Ausflußöffnung 4 befindet sich eine Verdüsungskammer 13, die an ihrem oberen Ende eine genau unter der Ausflußdüse 4 gelegene Verdüsungsanordnung 14 aufweist.Below the outflow opening 4 there is a spraying chamber 13 which has at its upper end a spraying arrangement 14 located exactly below the outflow nozzle 4.

Zum Aufschmelzen und zur Vakuumbehandlung wird das Ausgangsmaterial zunächst in den Induktionsschmelztiegel 1 eingegeben. Nach der Vakuumbehandlung wird die Legierung zur Einstellung der erforderlichen Gießtemperatur und zur Raffinationsbehandlung, d. h. zur Entfernung aller nichtmetallischen Verunreinigungen durch dichtebedingten Auftrieb und zur Einstellung der Gießtemperatur in den widerstandsbeheizten Schmelzofen 3 umgefüllt. Der dichtebedingte Auftrieb der nichtmetallischen Verunreinigungen kann durch das durch die Düsen 10 und/oder 11 in die Schmelze gelangende Inertgas unterstützt werden. In dem widerstandsbeheizten Schmelzofen 3 wird die Schmelze für die Dauer der Raffinationsbehandlung auf einer konstanten Gießtemperatur gehalten.For melting and for vacuum treatment, the starting material is first introduced into the induction crucible 1. After the vacuum treatment, the alloy is used to set the required casting temperature and for refining treatment, ie to remove all non-metallic impurities due to density Buoyancy and transferred to the setting of the casting temperature in the resistance-heated melting furnace 3. The density-related buoyancy of the non-metallic impurities can be supported by the inert gas that passes through the nozzles 10 and / or 11 into the melt. In the resistance-heated melting furnace 3, the melt is kept at a constant casting temperature for the duration of the refining treatment.

Zum Abgießen der Legierung in den Verdüsungsraum 13 wird die Stopfenstange 6 durch Betätigen der Regelvorrichtung 8 angehoben und dadurch die Ausflußdüse 4 geöffnet. Dabei kann der durch die Düse 12 austretende Inertgasstrahl zur Unterstützung der Verdüsung des in die Verdüsungskammer 13 einfließenden Legierungsstromes herangezogen werden.To pour the alloy into the atomization chamber 13, the stopper rod 6 is raised by actuating the control device 8 and the outflow nozzle 4 is thereby opened. The inert gas jet emerging through the nozzle 12 can be used to support the atomization of the alloy stream flowing into the atomization chamber 13.

In Abwandlung des beschriebenen Ausführungsbeispiels kann der widerstandsbeheizte Schmelzofen 3 zum Vergießen der Legierung im Form-, Block- und Stranggußverfahren verwendet werden.In a modification of the described embodiment, the resistance-heated melting furnace 3 can be used for casting the alloy in the form, block and continuous casting process.

Claims (12)

1. A process for the manufacture of high purity alloys, comprising the steps:
a) melting the alloy in an induction crucible and vacuum-treating the melt;
b) transferring the melt in vacuo to a second container, and
c) casting the melt from a discharge aperture dis- posed below the bath level,
characterized by the following steps:
d) refining treatment of the melt in the second container, the whole melt being heated to a required casting temperature and maintained at such temperature without bath movement until impurities have risen,
e) casting the melt at constant casting temperature, and
f) terminating casting before the impurities which have risen to the bath level can also be discharged.
2. A process for the manufacture of high purity alloys, comprising the steps:
a) melting the alloy in an induction crucible and vacuum-treating the melt,
b) transferring the melt in vacuo to a second container, and
c) casting the melt from a discharge aperture disposed below the bath level,
characterized by the following steps:
d) refining treatment of the melt in the second container with the supply of inert gas to the lower zone of the container, the whole melt being heated to a required casting temperature, ,
e) maintaining the casting temperature of the melt without bath movement until the impurities have risen,
f) casting the melt at constant casting temperature, and
g) terminating casting before the impurities which have risen to the bath level can also be discharged.
3. An apparatus for performing the process according to claims 1 or 2 having: an induction crucible (1) disposed' in a vacuum melting installation (2); a second container which is disposed in the vacuum melting installation and has a discharge aperture (4) disposed in its lower zone; a closure arrangement (5); and a chamber (13) below the vacuum melting installation for the solidification of the liquid alloy, characterized in that the second container takes the form of a rigidly disposed melting crucible (3) having heating means.
4. An apparatus according to claim 3, characterized in that the second melting crucible (3) takes the form of a resistance-heated melting furnace.
5. An apparatus according to claim 3, characterized in that the second heating crucible (3) can be heated inductively via a susceptor.
6. An apparatus according to claim 3, characterized in that the second melting crucible (3) can be operated at high frequency.
7. An apparatus according to claims 3 to 6, characterized in that nozzles (10) for supplying inert gas are disposed in the lower zone of the melting crucible (3).
8. An apparatus according to one of claims 3 to 7, characterized in that the closure arrangement (5) has a metallic stopper rod (6) having a temperature- resistant sheathing (9).
9. An apparatus according to claim 8, characterized in that apertures (11, 12) for the passage of inert gas are provided in the lower portion of the stopper rod (6).
10. An apparatus according to claim 9, characterized in that the apertures (11) provided in the lower portion of the stopper rod (6) are directed laterally into the cavity of the second melting crucible (3) which receives the alloy.
11. An apparatus according to claims 9 or 10, characterized in that the stopper rod (6) has an outlet aperture (12) directed into the discharge aperture (4) of the second melting crucible (3).
12. An apparatus according to one of claims 8 to 11, characterized in that the closure arrangement (5) can be cooled by a coolant.
EP84110654A 1983-09-26 1984-09-07 Process and apparatus for the manufacture of high-purity alloys Expired EP0137315B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84110654T ATE34775T1 (en) 1983-09-26 1984-09-07 PROCESS AND PLANT FOR PRODUCTION OF HIGH PURITY ALLOYS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3334733 1983-09-26
DE3334733A DE3334733C2 (en) 1983-09-26 1983-09-26 Process and plant for the production of high-purity alloys

Publications (3)

Publication Number Publication Date
EP0137315A2 EP0137315A2 (en) 1985-04-17
EP0137315A3 EP0137315A3 (en) 1985-08-21
EP0137315B1 true EP0137315B1 (en) 1988-06-01

Family

ID=6210057

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84110654A Expired EP0137315B1 (en) 1983-09-26 1984-09-07 Process and apparatus for the manufacture of high-purity alloys

Country Status (5)

Country Link
US (1) US4584015A (en)
EP (1) EP0137315B1 (en)
JP (1) JPS6096738A (en)
AT (1) ATE34775T1 (en)
DE (1) DE3334733C2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4664703A (en) * 1986-06-09 1987-05-12 Inland Steel Company Method for suppressing fuming in molten steel
US4948423A (en) * 1989-07-21 1990-08-14 Energy Conversion Devices, Inc. Alloy preparation of hydrogen storage materials
WO1995032312A1 (en) * 1994-05-25 1995-11-30 Hitachi Metals, Ltd. Method and apparatus for refining molten metal
DE69430541T2 (en) * 1994-11-25 2002-10-31 Hitachi Metals Ltd METHOD FOR REFINING METAL
US6340376B1 (en) * 1998-02-17 2002-01-22 Energy Conversion Devices, Inc. Method for combining metals with different melting points
US8061444B2 (en) * 2008-05-22 2011-11-22 Schlumberger Technology Corporation Methods and apparatus to form a well
CN106621429B (en) * 2015-07-20 2019-04-19 中国科学院上海应用物理研究所 The method and distilling apparatus of closed distillation fused salt

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2854228A (en) * 1954-10-14 1958-09-30 Nat Res Corp Vacuum furnace useful in the production of metals
NL102132C (en) * 1956-03-31
US3230074A (en) * 1962-07-16 1966-01-18 Chrysler Corp Process of making iron-aluminum alloys and components thereof
US3185565A (en) * 1962-11-16 1965-05-25 Pennsalt Chemicals Corp Method and apparatus for safe operation of vacuum chambers
DE1214359B (en) * 1963-04-05 1966-04-14 Balzers Vakuum G M B H System for melting and casting under vacuum
DE1291760B (en) * 1963-11-08 1969-04-03 Suedwestfalen Ag Stahlwerke Process and device for discontinuous and continuous vacuum melting and casting of steel and steel-like alloys (super alloys)
DE1228291B (en) * 1963-11-20 1966-11-10 Standard Messo Duisburg Method and device for the subsequent degassing of molten steels
US3467167A (en) * 1966-09-19 1969-09-16 Kaiser Ind Corp Process for continuously casting oxidizable metals
GB1260051A (en) * 1968-04-03 1972-01-12 Air Reduction Improvements in or relating to the manufacture of metal products
US3536125A (en) * 1968-09-17 1970-10-27 Pennwalt Corp Multiple tundish system for metal refining plant
US3764297A (en) * 1971-08-18 1973-10-09 Airco Inc Method and apparatus for purifying metal
US3798025A (en) * 1971-12-29 1974-03-19 Allegheny Ludlum Ind Inc Vacuum decarburization in rh and dh type degassing systems
DE2501603B2 (en) * 1975-01-16 1977-08-25 Institut problem htja Akademn Nauk Ukrainskoj SSR, Kiew (Sowjetunion) DEVICE FOR VACUUM TREATMENT OF LIQUID METALS

Also Published As

Publication number Publication date
DE3334733A1 (en) 1985-04-25
JPS6096738A (en) 1985-05-30
US4584015A (en) 1986-04-22
EP0137315A2 (en) 1985-04-17
EP0137315A3 (en) 1985-08-21
DE3334733C2 (en) 1985-08-14
ATE34775T1 (en) 1988-06-15

Similar Documents

Publication Publication Date Title
DE4320766C2 (en) Device for melting a solid layer of electrically conductive material
DE2710072C3 (en) Apparatus for treating molten metal with a highly reactive treating agent
EP0137315B1 (en) Process and apparatus for the manufacture of high-purity alloys
EP0814928A1 (en) Method and device for pouring a metal melt into a mould
EP0461306A1 (en) Induction smelting furnace
DE2411507A1 (en) METHOD AND DEVICE FOR TREATMENT OF METAL MELT
EP0180741A1 (en) Process and installation for maintaining or increasing the temperature of a metal melt
DE1483560A1 (en) Device for transferring flowable material, in particular for transferring molten metal to a continuous casting device
DE3211861A1 (en) METHOD AND DEVICE FOR PRODUCING HIGH-PURITY CERAMIC-FREE METAL POWDERS
DE3231316A1 (en) METHOD AND DEVICE FOR CONTROLLING THE POURING OF A MEL FROM A MELT CONTAINER WITH A BOTTOM OPENING
EP1076603B1 (en) Method for processing a molten metal mass, especially a molten light metal mass, and a dosing furnace which is encapsulated and which can be pressurized by protective gas
DE1041652B (en) Method for operating a vacuum induction melting plant
DE2655865A1 (en) PROCESS FOR CONTINUOUS STEEL CASTING
EP0433419B1 (en) Device for slag-free casting on in continuous casting installations
DE3734406A1 (en) METHOD AND DEVICE FOR THE PRODUCTION OF CASTING BODIES FROM PRESSURE-TREATED MELS FROM STEEL ALLOYS
EP0047431A1 (en) Method and apparatus for producing highly pure metal powder
DE2062114A1 (en) Pure, killed steel mfr - for deep-drawn quality sheet steel
EP1196258B1 (en) Device for purifying steel melts
EP4192636B1 (en) System for charging, melting and casting metal and metal alloys in a vacuum and/or shielding gas atmosphere and method for quasi-continuous melting and casting of metal in a vacuum and/or shielding gas atmosphere
DE2452611A1 (en) PROCESS AND DEVICE FOR REFINING AND / OR REFRESHING A METAL MELT
DE2811546A1 (en) METHOD AND DEVICE FOR CONTINUOUS STEEL CASTING
DE3640269C1 (en) Method employed in the continuous casting of steel melted in a manner which gives a low hydrogen content
DE2839870A1 (en) METAL CASTING METHOD AND DEVICE
DE2135289A1 (en)
DE2029687A1 (en) Process for casting metal or metal alloys 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

AK Designated contracting states

Designated state(s): AT BE FR GB IT SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

RHK1 Main classification (correction)

Ipc: C21C 5/52

RTI1 Title (correction)
RTI1 Title (correction)
AK Designated contracting states

Designated state(s): AT BE FR GB IT SE

17P Request for examination filed

Effective date: 19850807

17Q First examination report despatched

Effective date: 19860429

D17Q First examination report despatched (deleted)
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE FR GB IT SE

REF Corresponds to:

Ref document number: 34775

Country of ref document: AT

Date of ref document: 19880615

Kind code of ref document: T

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: LEYBOLD AKTIENGESELLSCHAFT

Effective date: 19890225

PLAB Opposition data, opponent's data or that of the opponent's representative modified

Free format text: ORIGINAL CODE: 0009299OPPO

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

Ref country code: FR

Payment date: 19890807

Year of fee payment: 6

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

Ref country code: SE

Payment date: 19890808

Year of fee payment: 6

R26 Opposition filed (corrected)

Opponent name: LEYBOLD AKTIENGESELLSCHAFT

Effective date: 19890225

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

Ref country code: GB

Payment date: 19890831

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: 19890913

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: 19890928

Year of fee payment: 6

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19900908

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

Ref country code: BE

Effective date: 19900930

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

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

Free format text: STATUS: PATENT REVOKED

BERE Be: lapsed

Owner name: FRIED. KRUPP G.M.B.H.

Effective date: 19900930

27W Patent revoked

Effective date: 19901113

GBPR Gb: patent revoked under art. 102 of the ep convention designating the uk as contracting state
EUG Se: european patent has lapsed

Ref document number: 84110654.5

Effective date: 19910527