US20040031583A1 - Method and device for controlling the temperature of steel from the surface of the bath of a continuous casting installation up to the furnace tap - Google Patents

Method and device for controlling the temperature of steel from the surface of the bath of a continuous casting installation up to the furnace tap Download PDF

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Publication number
US20040031583A1
US20040031583A1 US10/399,002 US39900203A US2004031583A1 US 20040031583 A1 US20040031583 A1 US 20040031583A1 US 39900203 A US39900203 A US 39900203A US 2004031583 A1 US2004031583 A1 US 2004031583A1
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US
United States
Prior art keywords
ladle
temperature
tundish
steel
time
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.)
Abandoned
Application number
US10/399,002
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English (en)
Inventor
Fritz-Peter Pleschiutschnigg
Lothar Parschat
Eckart Schwencke
Erwin Wosch
Bernt Rollinger
Stephan Feldhaus
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
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Individual
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
Priority claimed from DE10152201A external-priority patent/DE10152201A1/de
Application filed by Individual filed Critical Individual
Assigned to SMS DEMAG AG reassignment SMS DEMAG AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ROLLINGER, BERNT, PARSCHAT, LOTHAR, FELDHAUS, STEPHAN, PLESCHIUTSCHNIGG, FRITZ-PETER, SCHWENCKE, ECKART, WOSCH, ERWIN
Publication of US20040031583A1 publication Critical patent/US20040031583A1/en
Abandoned legal-status Critical Current

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    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring

Definitions

  • the invention pertains to a method and a device for controlling the temperature of the steel in a steel production process between the meniscus of a continuous casting mold and the tapping of the furnace and thus over the entire course of secondary metallurgical processing with a final temperature-determining process stage such as a ladle furnace.
  • the temperature of the steel at the meniscus is an essential factor in determining the quality of the steel (both surface quality and internal quality) and also the reliability of the casting operation.
  • Controlling the temperature of the steel at the meniscus of the continuous casting mold is especially important when the casting speeds are increased to 10 or 12 m/min. There are also many other important factors, however, which are important for obtaining the desired casting result, which will be discussed below.
  • the invention is based on the task of creating a method and a device which make it possible, regardless of these numerous factors, to plan and to control on-line the change in temperature of the melt between the temperature of the steel at the meniscus and the furnace tap.
  • FIGS. 1 - 4 present the invention by way of example and in highly schematic fashion:
  • FIG. 1 shows the process and production chain extending between the furnace tap and the meniscus in the continuous casting mold
  • FIG. 2 shows the change in the temperature campaign or the temperature curve of the steel over the course of processing in the processing chain, starting from the meniscus in the mold and proceeding via the ladle furnace to the furnace tap;
  • FIG. 3 shows an example of a melt plan in the form of the two FIGS. 3 a and 3 b.
  • the tundish ( 3 ) and the ladle ( 4 . 3 ) can be considered heat exchangers, the specific thermal data of which are determined by the type, age, or wear condition of their linings.
  • the tundish temperature ( 3 . 1 ) is adjusted appropriately on the basis of the knowledge of the temperature loss ( 4 . 1 . 1 ) which occurs between the ladle furnace and the tundish.
  • a melt plan is shown in FIG. 3; it starts with the temperature of the steel at the meniscus ( 2 . 1 ), expressed as the equivalent liquids temperature in the tundish T ° li ( 3 . 1 ) with auxiliary temperatures of +5, 10, 15, 20° C.
  • the delivery temperature of the steel from the ladle furnace is determined by the ladle history ( 7 ) with its two essential factors:
  • the holding time of the steel in the ladle ( 7 . 1 ) between the time it is tapped from the furnace and its delivery from the ladle furnace for the start of casting i.e., the “ladle full” time
  • FIG. 4 shows a suitable ladle identification system ( 8 ) based on the encoding of the natural radiation of the ladle wall by a perforated metal plate ( 8 . 1 . 1 ) and the detection of that radiation by a radiation sensor (receiver) ( 8 . 1 . 2 ).
  • FIG. 1 shows the entire process and production chain, which extends between the tapping of the furnace ( 5 ) and the continuous casting mold ( 1 ). So that the temperature of the melt, starting from the desired temperature of the steel at the meniscus ( 2 . 1 ), can be planned and controlled on-line, first for the tundish and then for the ladle furnace LF-ex, it is necessary to know:
  • the history ( 3 . 2 ) of the tundish comprising its preheating temperature ( 3 . 2 . 1 ), preheating time ( 3 . 2 . 2 ), and the tundish turnaround time ( 3 . 2 . 3 ) with the various possible preparation steps such as relining, spraying, drying, etc.; and
  • This history of the ladle ( 7 ) thus consists of:
  • the “ladle full” time i.e., the time between the start of the tap and the delivery from the ladle furnace with a maximum duration until the start of casting of, for example, 25 minutes ( 7 - 1 );
  • ladle empty time ( 7 . 2 ) constitute the standard ladle cycle time ( 7 . 4 ).
  • the ladle passes through various treatments such as cleaning ( 7 . 2 . 1 ) and the preparation of the slide valve for the next use ( 7 . 2 . 2 ).
  • the ladle can also be taken out of the ladle cycle so that it can be heated on a heating stand ( 7 . 5 ) during long empty periods or placed on a ladle lining stand ( 7 . 6 ) so that it can be given a new lining.
  • the ladle identification system ( 8 ) is installed in the ladle cycle ( 7 . 4 ) at the locations relevant to the determination of the ladle history ( 7 ).
  • the detection system works preferably by means of the encoding of the ladle radiation ( 8 . 1 ) and is based on the natural radiation of the ladle.
  • a measuring system of this type can record the movement and the differentiated time sequences in the “ladle full” ( 7 . 1 ) and “ladle empty” ( 7 . 2 ) phases, so that the temperature losses ( 4 . 1 . 1 ) between the LF and the tundish can be put into functional relationships with each other on-line on the basis of the data thus acquired.
  • a procedure similar to that for the ladle is also appropriate in the area of tundish management ( 3 . 2 ), where special attention should be paid to the start of casting of a casting sequence consisting of several ladles.
  • the history of the tundish ( 3 . 2 ) is superimposed additionally on the temperature loss ( 4 . 1 . 1 ) between the LF ( 4 . 1 ) and the tundish ( 3 ); this history consists of:
  • FIG. 2 shows the change in the temperature of the melt as it travels from the electric furnace ( 5 . 2 ) or BOF ( 4 . 1 ) via the ladle furnace LF-ex ( 4 . 1 ) to the meniscus ( 2 ) in the mold ( 1 ).
  • the desired temperature of the steel at the meniscus ( 2 . 1 ) is the basis on which the temperatures in the tundish and in the ladle furnace LF-ex ( 4 . 1 ) are planned.
  • the discontinuity in temperature between the meniscus and the tundish ( 9 ), i.e., the decrease in the temperature of the steel between the-tundish and the meniscus, is determined essentially by the casting speed ( 6 ) and the casting output, that is, the solidification thickness and casting width.
  • FIG. 3 is divided into parts 3 a and 3 b .
  • FIG. 3 a shows the tundish temperature ( 3 . 1 ) TT versus the casting speed ( 6 ) VC for the equivalent liquidus temperature of the steel ( 3 . 1 . 1 ) in the tundish T ° li with the auxiliary temperatures ( 3 . 1 . 1 . 1 ′) T ° li +5, 10, 15, 20° C.
  • the discontinuity in the temperature ( 4 . 1 . 1 ) of the steel between the tundish and the ladle furnace LF-ex ( 4 . 1 ) is determined as shown in FIG. 3 b.
  • a tundish preheating temperature of 1,200° C. 3 . 2 . 1 . 2
  • a 2 nd and an n-th ladle 3 . 2 . 1 . 3
  • FIG. 4 shows the ladle identification system ( 8 ), which works with a perforated metal plate ( 8 . 1 . 1 ) to encode the natural radiation ( 8 . 1 ). The encoded radiation is then detected by one or more radiation sensors ( 8 . 1 ) located at strategic points in the ladle cycle ( 7 . 4 ).
  • Ladle History 7.1 holding time of the steel in the ladle from the tapping of the furnace to the delivery of the ladle furnace (LF-ex) or until the “opening” of the ladle (start of casting), “ladle full” time 7.2. time during which the ladle contains no steel, “ladle empty” time 7.2.1 cleaning of the ladle, bottom, nozzle bricks, slide valve 7.2.2 preparation of the slide valve, inspection, packing the slide valve sand, etc. 7.3 ladle condition, age and type of lining 7.4 ladle cycle time 7.4.1 ladle cycle, ladle turnaround 7.5 ladle heating status 7.6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Control Of Temperature (AREA)
US10/399,002 2000-11-04 2001-10-31 Method and device for controlling the temperature of steel from the surface of the bath of a continuous casting installation up to the furnace tap Abandoned US20040031583A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10054760 2000-11-04
DE10152201A DE10152201A1 (de) 2000-11-04 2001-10-23 Verfahren und Vorrichtung zur Kontrolle der Stahltemperatur vom Gießspiegel einer Stranggießanlage bis zum Ofenabstich
PCT/EP2001/012594 WO2002036292A2 (fr) 2000-11-04 2001-10-31 Procede et dispositif pour controler la temperature de l'acier a la surface du bain d'une installation de coulee continue jusqu'a la percee de four

Publications (1)

Publication Number Publication Date
US20040031583A1 true US20040031583A1 (en) 2004-02-19

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ID=26007569

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/399,002 Abandoned US20040031583A1 (en) 2000-11-04 2001-10-31 Method and device for controlling the temperature of steel from the surface of the bath of a continuous casting installation up to the furnace tap

Country Status (13)

Country Link
US (1) US20040031583A1 (fr)
EP (1) EP1337366A2 (fr)
JP (1) JP2004512958A (fr)
CN (1) CN1473081A (fr)
AU (1) AU2002224817A1 (fr)
BR (1) BR0115073A (fr)
CA (1) CA2424368A1 (fr)
CZ (1) CZ20031218A3 (fr)
HU (1) HUP0303371A2 (fr)
MX (1) MXPA03003950A (fr)
PL (1) PL361622A1 (fr)
RU (1) RU2003116517A (fr)
WO (1) WO2002036292A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013249506A (ja) * 2012-05-31 2013-12-12 Azbil Corp 記号識別方法および記号識別装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104525926B (zh) * 2014-11-26 2016-08-24 攀枝花钢城集团瑞钢工业有限公司 钢包下线判定的方法
DE102014224334A1 (de) 2014-11-28 2016-06-02 Sms Group Gmbh Simulierung von Temperaturverteilungen innerhalb von Pfannen eines Hüttenwerks und innerhalb von in den Pfannen enthaltener Metallschmelze
JP6252532B2 (ja) * 2015-03-23 2017-12-27 Ｊｆｅスチール株式会社 転炉吹錬終了時目標溶鋼温度設定装置及びその方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3797310A (en) * 1972-02-28 1974-03-19 Steel Corp Temperature sensing device
US4133036A (en) * 1976-02-26 1979-01-02 Republic Steel Corporation Method and system for monitoring a physical condition of a medium
US4279151A (en) * 1979-08-07 1981-07-21 Bethlehem Steel Corporation Temperature measuring system
US4411534A (en) * 1980-01-11 1983-10-25 Voest-Alpine Aktiengesellschaft Method of continuously measuring the temperature of the surface of a continuously cast strand over its length
US5105874A (en) * 1989-09-13 1992-04-21 Institut De Recherches De La Siderurgie Francaise (Irsid) Process for continuously determining the thickness of the liquid slag on the surface of a bath of molten metal in a metallurgical container
US5951164A (en) * 1995-06-30 1999-09-14 Novacast Aktiebolag Method for contactless continuous temperature measurement of the solidification of metal alloys
US6172367B1 (en) * 1995-12-20 2001-01-09 Voest-Alpine Industrieanlagenbau Gmbh. Method and device for measuring electromagnetic waves emanating from a melt
US6257004B1 (en) * 1997-05-09 2001-07-10 Alcan International Limited Method and apparatus for measuring quenchant properties of coolants
US20030014195A1 (en) * 2000-06-07 2003-01-16 Matthias Arzberger Method and device for local processing of casting data arising from measurement data obtained from a continuous casting chill by means of sensors

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2950188B2 (ja) * 1995-02-21 1999-09-20 住友金属工業株式会社 連続鋳造における表面欠陥の抑制方法

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3797310A (en) * 1972-02-28 1974-03-19 Steel Corp Temperature sensing device
US4133036A (en) * 1976-02-26 1979-01-02 Republic Steel Corporation Method and system for monitoring a physical condition of a medium
US4279151A (en) * 1979-08-07 1981-07-21 Bethlehem Steel Corporation Temperature measuring system
US4411534A (en) * 1980-01-11 1983-10-25 Voest-Alpine Aktiengesellschaft Method of continuously measuring the temperature of the surface of a continuously cast strand over its length
US5105874A (en) * 1989-09-13 1992-04-21 Institut De Recherches De La Siderurgie Francaise (Irsid) Process for continuously determining the thickness of the liquid slag on the surface of a bath of molten metal in a metallurgical container
US5951164A (en) * 1995-06-30 1999-09-14 Novacast Aktiebolag Method for contactless continuous temperature measurement of the solidification of metal alloys
US6172367B1 (en) * 1995-12-20 2001-01-09 Voest-Alpine Industrieanlagenbau Gmbh. Method and device for measuring electromagnetic waves emanating from a melt
US6257004B1 (en) * 1997-05-09 2001-07-10 Alcan International Limited Method and apparatus for measuring quenchant properties of coolants
US20030014195A1 (en) * 2000-06-07 2003-01-16 Matthias Arzberger Method and device for local processing of casting data arising from measurement data obtained from a continuous casting chill by means of sensors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013249506A (ja) * 2012-05-31 2013-12-12 Azbil Corp 記号識別方法および記号識別装置

Also Published As

Publication number Publication date
RU2003116517A (ru) 2004-12-10
AU2002224817A1 (en) 2002-05-15
WO2002036292A3 (fr) 2002-08-08
BR0115073A (pt) 2003-07-29
PL361622A1 (en) 2004-10-04
CN1473081A (zh) 2004-02-04
WO2002036292A2 (fr) 2002-05-10
JP2004512958A (ja) 2004-04-30
EP1337366A2 (fr) 2003-08-27
CA2424368A1 (fr) 2003-03-28
HUP0303371A2 (en) 2004-01-28
MXPA03003950A (es) 2004-05-24
CZ20031218A3 (cs) 2003-10-15

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AS Assignment

Owner name: SMS DEMAG AG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:PLESCHIUTSCHNIGG, FRITZ-PETER;PARSCHAT, LOTHAR;SCHWENCKE, ECKART;AND OTHERS;REEL/FRAME:014366/0304;SIGNING DATES FROM 20030311 TO 20030328

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE