EP0462988B1 - Verfahren und vorrichtung zur vakuumbehandlung von metallen - Google Patents

Verfahren und vorrichtung zur vakuumbehandlung von metallen Download PDF

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Publication number
EP0462988B1
EP0462988B1 EP90903585A EP90903585A EP0462988B1 EP 0462988 B1 EP0462988 B1 EP 0462988B1 EP 90903585 A EP90903585 A EP 90903585A EP 90903585 A EP90903585 A EP 90903585A EP 0462988 B1 EP0462988 B1 EP 0462988B1
Authority
EP
European Patent Office
Prior art keywords
lid
vacuum
free space
annular
ladle
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
EP90903585A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0462988A1 (de
Inventor
Rainer Dittrich
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.)
Vodafone GmbH
Original Assignee
Mannesmann 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 Mannesmann AG filed Critical Mannesmann AG
Priority to AT90903585T priority Critical patent/ATE95250T1/de
Publication of EP0462988A1 publication Critical patent/EP0462988A1/de
Application granted granted Critical
Publication of EP0462988B1 publication Critical patent/EP0462988B1/de
Anticipated expiration legal-status Critical
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Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10Handling in a vacuum

Definitions

  • the invention relates to a method and a device for vacuum treatment of metals, in particular steel, according to the features of the preambles of claims 1 and 3.
  • pan degassing the tapping pan filled with steel is lowered into a large cylindrical chamber and then closed by a lid in a vacuum-tight manner .
  • a rubber ring is usually used as a seal.
  • the lids are made either from steel molds or from sheet metal structures.
  • On the underside of the cover there is radiation protection made from sheet metal and / or refractory ramming compound.
  • the vacuum generation usually consists of at least four emitters. If a steel melt is exposed to a vacuum, gas bubbles are formed inside the steel with a pressure that is dependent on the internal pressure above the melt surface.
  • the unquenched steel with a high oxygen content triggers a boiling effect at the pressure of less than 200 torr in the free space of the vacuum treatment vessel via the formation of carbon oxide and thereby simultaneously flushes the hydrogen and nitrogen out of the molten metal, so that even at this relatively poor vacuum The gases are removed. If the pressure is reduced further, the boiling can become so violent that, for example, molten steel rises 1 meter or more in the pan.
  • a sufficient climbing height by choosing a larger pan is required, so the pan cannot be filled to the brim, but must have a so-called freeboard.
  • the pan sizes and fill weights are coordinated with the hoists. Due to the requirement of The pans can no longer be filled to the brim on freeboards, with the disadvantage of reduced production.
  • the alternative solution, to enlarge the pans means that the lifting devices and holding devices have to be adjusted to the increased transport weight.
  • Another solution is a receptacle that depends on the pan.
  • DE-OS 20 32 830 a diving body is known which is immersed with the open side at the bottom in the melt and the inside of which is then evacuated.
  • This immersion body has the disadvantage that it has to be pressed into the melt in order to obtain the immersion depth required during the vacuum treatment. After the negative pressure is applied, the melt level rises by the barometric difference, which can be well over 1 meter high, while the melt level not occupied by the vacuum drops by a similar amount.
  • the melt level rises by the barometric difference, which can be well over 1 meter high, while the melt level not occupied by the vacuum drops by a similar amount.
  • DE-AS 19 65 136 discloses a device for ladle degassing of metal melts, in which a reaction tube arranged below the lid of the vacuum treatment vessel can be immersed in the melt. In a complex manner, a lance with reactive gases for metallurgical treatment is guided into the space enclosed by the reaction tube, in which the degassing and thus the increase in volume of the melt is to take place. Due to the uniform negative pressure acting on the surface of the weld pool, it is not possible to safely avoid the increase in volume in the ring area between the reaction tube and the rim of the pan.
  • DE-AS 19 12 907 and 19 19 19 053 disclose devices in which gas is introduced into the melt through a tubular partition wall immersed in the melt. This partition is surrounded in a ring by another tubular partition, so that they are in communicating connection. By connecting to pressure and / or suction pumps, the setting of different mirror heights in the individual rooms is achieved at different pressures and this ultimately leads to an improved flow of the metal or bath movement.
  • the object of the invention is to find a method and a device for vacuum treatment of metals, in particular steel, which avoid the above-mentioned disadvantages, using simple means, make a freeboard of the pan unnecessary and do not hinder the degassing of the melt.
  • the lower open edge of the apron is only slightly immersed in the melt.
  • the immersed apron creates two, an annular and a circular, sectors of the molten bath surface, which are subjected to different negative pressures.
  • the differential pressure can be set as desired.
  • the preferred range is between 1/2 to 2 pressure levels.
  • the size of the screen hardly impedes the vacuum change of the entire melt.
  • This effect is further improved by the fact that the depth of penetration of the apron is kept to a minimum and assumes values of 10 to 20 cm.
  • the space dimensions mentioned and the low immersion depth of the apron only marginally disturb the flow conditions in the melt. This has a particularly advantageous effect at today's high levels Flow rates of the melt pool, caused by large amounts of purge gas, which are introduced into the melt by up to three purge stones.
  • the pressure difference can either be tapped directly between two pressure levels or can be set continuously using a branch with throttles.
  • FIGS 1 and 1a show a vacuum treatment vessel 30 with a flange and sealing ring, on which a lid 20 rests.
  • a pan 40 filled with melt 41 is located in the vacuum treatment vessel 30.
  • the lower edge 22 of an apron 21 fastened to the cover 20 is immersed in the melt 41.
  • the apron 21 immersed in the molten bath surface divides it into a circular 42 and an annular 43 segment.
  • the free space A is enclosed by the circular molten bath surface 42, the inner jacket of the apron 21 and the circular part 23 of the cover 20.
  • the remaining part of the lid 20 with the annular part 29, the outer side of the skirt 21, the lower part of the vacuum treatment vessel 30, the outer side of the pan 40 and the annular melt surface 43 comprise the free space B.
  • the free space A is connected to the vacuum system 10 via a connection 24 in the area of the circular cover 23 and the free space B via a connection 25 in the area of the annular cover part 29.
  • the vacuum generation system 10 has a water ring pump 14, a steam jet 13 (60 Torr) and a condenser 16 between the two, further a steam jet 12 (10 Torr) and a steam jet 11 (0.5 Torr) and a capacitor 15 between the lamps 12 and 13 on.
  • the free space A is connected to the maximum vacuum level p1 of the steam jet 11, the free space B in the present case two levels less to the vacuum level p2, between the radiators 13 and 12.
  • the level of the circular 42 increases relative to the annular 43 melt surface by the amount a.
  • FIG. 1 a has an electrode 60 which projects through the electrode bushing 61 in the region of the circular cover part 23 into the free space A.
  • FIG. 2 schematically shows a vertically adjustable apron 21 which is attached to a circular part 23 of the cover 20, the circular part 23 being adjustable relative to the annular part 29 of the cover 20 by means of adjusting elements 51.
  • compensators 53 are provided between the annular part 29 and the circular part.
  • the connection 25 to the free space B is arranged in the lid 20, in the other case in the lower part of the vacuum treatment vessel 30.
  • FIG. 3 shows the essential elements of FIG. 1 with the difference that there is a connection of the connection 24 to the free space A via a branch 26, which is simultaneously connected to the connection 25 of the free space B, between the branch 26 and the connection 25 a throttle 27 is provided.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Furnace Details (AREA)
EP90903585A 1989-02-24 1990-02-20 Verfahren und vorrichtung zur vakuumbehandlung von metallen Expired - Lifetime EP0462988B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90903585T ATE95250T1 (de) 1989-02-24 1990-02-20 Verfahren und vorrichtung zur vakuumbehandlung von metallen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3906340 1989-02-24
DE3906340A DE3906340A1 (de) 1989-02-24 1989-02-24 Verfahren und vorrichtung zur vakuumbehandlung von metallen

Publications (2)

Publication Number Publication Date
EP0462988A1 EP0462988A1 (de) 1992-01-02
EP0462988B1 true EP0462988B1 (de) 1993-09-29

Family

ID=6375157

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90903585A Expired - Lifetime EP0462988B1 (de) 1989-02-24 1990-02-20 Verfahren und vorrichtung zur vakuumbehandlung von metallen

Country Status (11)

Country Link
US (1) US5242485A (zh)
EP (1) EP0462988B1 (zh)
JP (1) JP2722011B2 (zh)
KR (1) KR970005200B1 (zh)
CN (1) CN1022115C (zh)
BR (1) BR9007161A (zh)
CA (1) CA2009923C (zh)
DE (2) DE3906340A1 (zh)
ES (1) ES2020091A6 (zh)
WO (1) WO1990010087A1 (zh)
ZA (1) ZA901414B (zh)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5603749A (en) * 1995-03-07 1997-02-18 Bethlehem Steel Corporation Apparatus and method for vacuum treating molten steel
DE19518361C1 (de) * 1995-05-19 1996-08-08 Technometal Ges Fuer Metalltec Vakuumdichtes Reaktionsgefäß für die Stahlbehandlung mit einer Stopfbuchse
CN1087034C (zh) * 1999-11-02 2002-07-03 北京科技大学 盛钢桶浸渍罩密闭钢液喷粉脱硫方法及装置
RU2324744C1 (ru) * 2006-10-05 2008-05-20 Закрытое акционерное общество "Прочность" Способ вакуумного рафинирования стали в ковше, устройство (варианты) и патрубок для его осуществления
CN105624367B (zh) * 2014-12-01 2017-07-21 鞍钢股份有限公司 一种控制钢水氮含量的精炼装置及方法
RU2651097C2 (ru) * 2016-07-04 2018-04-18 Федеральное государственное унитарное предприятие "Центральный научно-исследовательский институт черной металлургии им. И.П.Бардина" (ФГУП "ЦНИИчермет им.И.П.Бардина") Устройство для вакуумирования металла

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU34584A1 (zh) * 1955-09-05
DE1804748U (de) * 1958-02-22 1960-01-28 Hoerder Huettenunion Ag Vorrichtung zum entgasen von stahlschmelzen.
DE1583294C2 (de) * 1967-10-24 1974-08-22 Standard Messo Duisburg Vorrichtung zur Teilmengenentgasung fluessigen Stahles durch Vakuumbehandlung
DE1912907C3 (de) * 1969-03-14 1978-06-29 Rheinlaender, Paul, Prof. Dr.-Ing., 3340 Wolfenbuettel Verfahren und Vorrichtung zur Erzeugung einer Bewegung in einem Metallbade, vornehmlich bei der Stahlentgasung
FR2037199B1 (zh) * 1969-03-14 1974-05-24 Voest Ag
DE1919053C3 (de) * 1969-04-15 1979-09-27 Rheinlaender, Paul, Prof. Dr.-Ing., 3340 Wolfenbuettel Verfahren und Vorrichtung zur Erzeugung einer Bewegung in einem Metallbade
DE1912936B2 (de) * 1969-03-14 1971-05-19 Vorrichtung und betriebsverfahren zum reinigen und vakuum entgasen von schmelzfluessigen metallen
DE1965136B1 (de) * 1969-12-27 1971-02-25 Standard Messo Duisburg Vorrichtung zur Pfannen-Entgasung von Stahl- oder anderen Metallschmelzen
JPS5110102A (en) * 1974-07-15 1976-01-27 Sumitomo Metal Ind Dh oyobi rh shinkudatsugasuho
DE2921722C2 (de) * 1979-05-29 1986-06-12 Leybold-Heraeus GmbH, 5000 Köln Schleusenrohr für anstückelbare Lichtbogenelektroden bei vakuummetallurgischen Anlagen

Also Published As

Publication number Publication date
CA2009923C (en) 1999-09-14
KR920700297A (ko) 1992-02-19
DE59002951D1 (de) 1993-11-04
BR9007161A (pt) 1992-01-28
KR970005200B1 (ko) 1997-04-14
ZA901414B (en) 1990-11-28
DE3906340C2 (zh) 1991-01-31
ES2020091A6 (es) 1991-07-16
WO1990010087A1 (de) 1990-09-07
DE3906340A1 (de) 1990-08-30
CN1022115C (zh) 1993-09-15
EP0462988A1 (de) 1992-01-02
US5242485A (en) 1993-09-07
CA2009923A1 (en) 1990-08-24
JP2722011B2 (ja) 1998-03-04
CN1045128A (zh) 1990-09-05

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