EP0922511A1 - Verfahren zum Stahlstranggiessen zur Herstellung von hochwertigen Barren oder Blöcke - Google Patents

Verfahren zum Stahlstranggiessen zur Herstellung von hochwertigen Barren oder Blöcke Download PDF

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Publication number
EP0922511A1
EP0922511A1 EP98203947A EP98203947A EP0922511A1 EP 0922511 A1 EP0922511 A1 EP 0922511A1 EP 98203947 A EP98203947 A EP 98203947A EP 98203947 A EP98203947 A EP 98203947A EP 0922511 A1 EP0922511 A1 EP 0922511A1
Authority
EP
European Patent Office
Prior art keywords
buffer tank
steel
argon
feedline
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98203947A
Other languages
English (en)
French (fr)
Other versions
EP0922511B1 (de
Inventor
Arie Hamoen
Dietrich Willem Van Der Plas
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.)
Tata Steel Ijmuiden BV
Original Assignee
Hoogovens Staal BV
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 Hoogovens Staal BV filed Critical Hoogovens Staal BV
Publication of EP0922511A1 publication Critical patent/EP0922511A1/de
Application granted granted Critical
Publication of EP0922511B1 publication Critical patent/EP0922511B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/113—Treating the molten metal by vacuum treating

Definitions

  • the invention relates to a process for the continuous casting of molten steel to form high-quality billets or blooms, utilizing a device of the type comprising a buffer tank, an immersion pipe, a casting mould, and a line for feeding the molten metal to the buffer tank, the immersion pipe being connected to the bottom of the buffer tank and, during operation, extending as far as into the casting mould, the buffer tank being designed so that it can be closed off in a gastight manner and being provided in or in the vicinity of its top wall with a suction opening, and the feedline opening into the buffer tank in the vicinity of its bottom, while the other end of the feedline is connected to the bottom of a tundish, which bottom lies at a higher level than that of the buffer tank, and means being present for injecting a flush gas into the molten steel at the location of the feedline.
  • a device of the type mentioned in the preamble has already been described in Dutch patent NL 1001976 for use in the casting of slabs.
  • the aim of this device is to counteract the formation of cracks and oxide inclusions, which are often relatively large inclusions, by flushing with a flush gas.
  • the injection of small volumes of, for example, argon is sufficient, consideration being given, for example, to less than 5 l (s.t.p.) per tonne of cast steel. Therefore, depending on the geometry of the casting installation and the immersion pipe, the operating pressure must not be too low. For this known application, the operating pressure will generally have to be approx. 100 mbar or higher.
  • An advantage of very low hydrogen concentrations in, for example, steel which is subject to considerable deformation consists in the fact that such concentrations prevent the formation of hydrogen-filled cavities in the solidifying steel.
  • the invention consists in the fact that, in the method of the type which is known according to the preamble, argon is injected as the flush gas and that gas is extracted from the buffer tank via the suction opening until an absolute gas pressure of ⁇ 15 mbar is established in the top of the said buffer tank, and that argon is injected in a volume of > 25 l (s.t.p.) per tonne of cast steel.
  • flush gas such as argon
  • the bubbles of argon gas have two functions. Firstly, the gas bubbles form nuclei for the formation of hydrogen bubbles, with the result that hydrogen is diffused out of the molten metal more quickly, and secondly the argon gas absorbs hydrogen inside the bubbles.
  • the residence time of the argon gas bubbles in the molten steel can be increased still further, thus allowing further improved removal of hydrogen from the steel, if the argon injected brings about a flow of the steel along the surface of the bath.
  • This can be achieved, for example, by causing the gas bubbles to rise upwards in the buffer tank in the vicinity of a wall which is at a distance from the location where the immersion pipe is connected to the bottom of the buffer tank.
  • Reference numeral 1 indicates, on an enlarged scale, the inner wall of a casting mould for casting steel billets.
  • An immersion pipe 2 for supplying molten steel extends to below the level 3 of the steel in the casting mould.
  • the casting mould is intensively cooled (not shown), with the result that a solidified shell 4 is formed, the thickness of which increases in the downwards direction.
  • this solidified shell 4 has to be sufficiently strong to be able to be withdrawn further using mechanical means without it rupturing.
  • the means for withdrawing the billet which is formed in this way are not shown, but are in the form of a traditional set of rollers such as that which is depicted, by way of example, in German Laid-Open Specification 2,017,469.
  • the immersion pipe is connected to a buffer tank 5, which is closed off with the aid of a cover 6, and a vacuum can be created, via the suction opening 7, above the molten steel which is situated in the buffer tank 5.
  • the presence of a buffer tank makes the flow of molten steel to and through the immersion pipe 2 more regular, while furthermore, as a result of the reduced gas pressure above the molten steel, the ferrostatic pressure in the immersion pipe is reduced.
  • molten steel is fed to the buffer tank 5 through the feedline 8, which is for its part connected to a tundish 9.
  • This tundish 9 is able to ensure that there is a constant flow of steel to the buffer tank 5, even if the molten steel is supplied from the steel factory in batches via steel ladles 10.
  • Steel ladle 10 is for its part emptied into tundish 9 via a casting pipe 11.
  • the flow of steel from the tundish 9 can be regulated in order to compensate for differences in the level 13 of the steel in the tundish.
  • the stopper rod 12 can also be used, if desired, to shut off the flow from the tundish entirely.
  • the stream of bubbles is additionally diverted in the upwards direction. This also prevents gas bubbles from being entrained into the casting mould by the flow of liquid steel.
  • a simple projection made of refractory material and with a height of approximately 10 cm is sufficient to achieve this effect.
  • the bubbles 16 grow, initially by taking up hydrogen and then as a result of the ferrostatic pressure on these rising bubbles being reduced. As a result, the surface area of the bubbles is increased to such an extent that hydrogen can be absorbed very intensively into the argon bubbles. Then, at the surface of the bath, the hydrogen which is released is extracted via suction opening 7.
  • novel process also allows other components which are naturally gaseous to be removed from the steel which is to be cast.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP98203947A 1997-11-28 1998-11-25 Verfahren zum Stahlstranggiessen zur Herstellung von hochwertigen Barren oder Blöcke Expired - Lifetime EP0922511B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1007646 1997-11-28
NL1007646A NL1007646C2 (nl) 1997-11-28 1997-11-28 Werkwijze voor het continu gieten van gesmolten staal tot knuppels of blooms van hoge kwaliteit.

Publications (2)

Publication Number Publication Date
EP0922511A1 true EP0922511A1 (de) 1999-06-16
EP0922511B1 EP0922511B1 (de) 2002-12-18

Family

ID=19766079

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98203947A Expired - Lifetime EP0922511B1 (de) 1997-11-28 1998-11-25 Verfahren zum Stahlstranggiessen zur Herstellung von hochwertigen Barren oder Blöcke

Country Status (5)

Country Link
EP (1) EP0922511B1 (de)
AT (1) ATE229858T1 (de)
DE (1) DE69810252D1 (de)
NL (1) NL1007646C2 (de)
NO (1) NO985569L (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7156151B2 (en) 2003-10-10 2007-01-02 Nucor Corporation Casting steel strip
US7484551B2 (en) 2003-10-10 2009-02-03 Nucor Corporation Casting steel strip

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2017469A1 (de) * 1969-04-15 1970-10-22 Vereinigte österreichische Eisen- und Stahlwerke AG, Linz (Österreich) Anlage zum Stranggießen sowie kontinuierliches Gießverfahren unter Verwendung dieser Anlage
JPS5797847A (en) * 1980-12-11 1982-06-17 Kawasaki Steel Corp Method for feeding molten metal into mold in continuous casting
JPS5835051A (ja) * 1981-08-26 1983-03-01 Kawasaki Steel Corp 連続鋳造機におけるタンデイツシユ
FR2675411A1 (fr) * 1991-04-16 1992-10-23 Siderurgie Fse Inst Rech Repartiteur pour la coulee continue de metal liquide, notamment de l'acier, entre une poche et une lingotiere.
NL1001976C2 (nl) * 1995-12-22 1997-06-24 Hoogovens Groep Bv Werkwijze en inrichting voor het continu gieten van staal.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2017469A1 (de) * 1969-04-15 1970-10-22 Vereinigte österreichische Eisen- und Stahlwerke AG, Linz (Österreich) Anlage zum Stranggießen sowie kontinuierliches Gießverfahren unter Verwendung dieser Anlage
JPS5797847A (en) * 1980-12-11 1982-06-17 Kawasaki Steel Corp Method for feeding molten metal into mold in continuous casting
JPS5835051A (ja) * 1981-08-26 1983-03-01 Kawasaki Steel Corp 連続鋳造機におけるタンデイツシユ
FR2675411A1 (fr) * 1991-04-16 1992-10-23 Siderurgie Fse Inst Rech Repartiteur pour la coulee continue de metal liquide, notamment de l'acier, entre une poche et une lingotiere.
NL1001976C2 (nl) * 1995-12-22 1997-06-24 Hoogovens Groep Bv Werkwijze en inrichting voor het continu gieten van staal.

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 006, no. 190 (M - 159) 29 September 1982 (1982-09-29) *
PATENT ABSTRACTS OF JAPAN vol. 007, no. 116 (M - 216) 20 May 1983 (1983-05-20) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7156151B2 (en) 2003-10-10 2007-01-02 Nucor Corporation Casting steel strip
US7484551B2 (en) 2003-10-10 2009-02-03 Nucor Corporation Casting steel strip

Also Published As

Publication number Publication date
EP0922511B1 (de) 2002-12-18
NL1007646C2 (nl) 1999-05-31
NO985569L (no) 1999-05-31
ATE229858T1 (de) 2003-01-15
DE69810252D1 (de) 2003-01-30
NO985569D0 (no) 1998-11-27

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