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EP1256401B1 - Verfahren zum Regeln der Füllstandhöhe des Stahles in eine Stranggiesskokille - Google Patents

Verfahren zum Regeln der Füllstandhöhe des Stahles in eine Stranggiesskokille Download PDF

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Publication number
EP1256401B1
EP1256401B1 EP02076761A EP02076761A EP1256401B1 EP 1256401 B1 EP1256401 B1 EP 1256401B1 EP 02076761 A EP02076761 A EP 02076761A EP 02076761 A EP02076761 A EP 02076761A EP 1256401 B1 EP1256401 B1 EP 1256401B1
Authority
EP
European Patent Office
Prior art keywords
level
steel
ingot mold
continuous casting
radioactive
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
EP02076761A
Other languages
English (en)
French (fr)
Other versions
EP1256401A2 (de
EP1256401A3 (de
Inventor
Ernesto Lombardi
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.)
O R I MARTIN ACCIAIERIA E FERR
Ori Martin Acciaieria E Ferriera Di Brescia SpA
Original Assignee
O R I MARTIN ACCIAIERIA E FERR
Ori Martin Acciaieria E Ferriera Di Brescia SpA
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 O R I MARTIN ACCIAIERIA E FERR, Ori Martin Acciaieria E Ferriera Di Brescia SpA filed Critical O R I MARTIN ACCIAIERIA E FERR
Publication of EP1256401A2 publication Critical patent/EP1256401A2/de
Publication of EP1256401A3 publication Critical patent/EP1256401A3/de
Application granted granted Critical
Publication of EP1256401B1 publication Critical patent/EP1256401B1/de
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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
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • B22D11/201—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level
    • B22D11/206—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level by using X-rays or nuclear radiation
    • 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
    • B22D11/161—Controlling or regulating processes or operations for automatic starting the casting process
    • 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
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • B22D11/201—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level
    • B22D11/202—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level by measuring temperature

Definitions

  • the present invention relates to a method for controlling the level of steel in continuous casting in an ingot mold, in particular for small sized billets.
  • billets currently produced with this method are required to exhibit almost absolute surface and sub-surface integrity, which can only be obtained by non-linear (parabolic and derivative) taper ingot molds and with the precise control of functional parameters.
  • the control of steel level in an ingot mold is certainly important. This applies to both what relates to the absolute value (that is, the exact detection of the meniscus position) and to what relates to the stability of such value, the first one since it determines the initial size of the skin being moulded and the consequent conditions of cooling of the billet, and the second one since it is a potential cause of inclusions caused by covering dust in the steel thus produced.
  • the method based on a radioactive level measurement is the most widespread. This method reads the variation in a radioactive flow darkened by the level of steel present in the ingot mold.
  • this method exhibits a high speed of detection of the variations in the steel level, which is associated to the low accuracy in the determination of such level value.
  • the second method acts by reading the level of light emitted by the meniscus surface or the light of a luminous beam reflected by the covering dust.
  • This method is almost exclusively used in free casting since it detects the upper portion of what is present in the ingot mold and is not capable of distinguishing between steel, slag or covering dust.
  • the third method essentially consists in a sensor (a coil) detecting the variations of magnetic "resonance" surrounding it.
  • This method is mainly used for controlling the steel level in continuous casting for thick slabs or blooms since it is much affected by the variations of magnetic permeability of the ingot mold copper as temperature changes.
  • the magnetic method exhibits a high speed of detection of variations in the steel level, beside a good accuracy in the level determination.
  • the magnetic detection method cannot be used for producing small sections (for example, smaller than 160 mm) and has a very high purchase cost.
  • the fourth known measurement method is that called thermal method, and is based on the fact that the thermal spectrum on the ingot mold wall is function of the steel level.
  • the level of the same steel is read in an indirect manner through the detection of the ingot mold wall temperature.
  • Such temperature measurement occurs through the use of micro-thermocouples inserted into the copper wall of the ingot mold, or through the detection of the magnetic permeability variation induced in copper by the different temperature.
  • the thermal method exhibits an excellent accuracy in the determination of the level (if read in precise conditions) but exhibits the defect of having absolute unreliability in the dynamic detection of level variations.
  • US-A-4 770 230 relates to an apparatus for starting a continuous casting plant having an arrangement for controlling the level if molten metal in a continuous casting mould.
  • GB-A-1 463 624 refers to a method and an apparatus for controlling the pouring of molten metal in a continuous casting process.
  • a general object of the present invention is to find a different solution to the technical problem mentioned above.
  • Another object is to realise a method for controlling the level of steel in continuous casting in an ingot mold, in particular for small sized billets, which should be adapted for carrying out the above task, even though being easy to operate.
  • FIG. 11 a schematic view of a device for controlling the level of steel in continuous casting in an ingot mold, in particular for small sized billets, indicated with reference numeral 11.
  • Such device 11 is arranged in the proximity of an outside wall 12 of a copper ingot mold 13 with square section, around which a water conveyor 14 is arranged for cooling it during the steel continuous casting operations.
  • Steel is fed through a casting duct 15 directly connected to a tundish (not shown) that allows realising a series of sequences in the desired number.
  • such water conveyor 14 is provided with a flanging 16 at which device 11 according to the present invention is arranged.
  • Device 11 comprises a radioactive detector and a thermal detector.
  • the radioactive detector comprises a radioactive source 17, for example realised with cobalt 60, and a scintillator 18, among which a radioactive flow sets up. Such flow remains constant until it is darkened by a level 19 of steel present in the ingot mold entering from the casting duct 15. Thereby, there occurs a variation of a radioactive flow that indicates the variation of position of level 19 of steel into the ingot mold 13.
  • a special connection line 20 is connected to a central processor 21 that receives the variation signal and commands a limitation or an increase of steel feeding from the casting duct 15 to maintain the level 19 of steel constant.
  • Device 11 for controlling the level of steel in continuous casting in an ingot mold also comprises a thermal detector, globally indicated with reference numeral 22, also connected to the central processor 21 through its own connection line 23.
  • Such thermal detector 22 checks the thermal spectrum on wall 12 of ingot mold 13 based on the level 19 of steel. Such measurement of temperature is carried out, for example, through the detection - by the thermal detector 22 - of the variation of magnetic permeability induced in the copper wall 12 of ingot mold 13.
  • the resulting assembly exhibits much better features than those of known devices.
  • Such device allows realising a new and original method for controlling the level of steel in continuous casting ion an ingot mold, in particular for small sized billets.
  • the radioactive detector 17, 18 is actuated at a high speed of detection of changes in the level 19 of steel.
  • a broad detection of the level that sets up is sufficient since, among the other things, the solidified slag is minimal.
  • This type of detection allows a quick, effective and quite precise start up of the casting operation.
  • Such thermal detector 22 detects with the utmost accuracy the steel level 19, once the temperature of copper of wall 12 of ingot mold 13 has reached the predetermined level.
  • the first detector 17, 18 exhibits a high dynamic response capability (about 0,10 seconds) whereas the second detector 22 is highly accurate when reading the level (excluding the transients).
  • the new method for controlling the level consists of the radioactive system, which operates in a traditional manner during the automatic start up step and during the initial regulation step.
  • the level value detected by the thermal system (suitably filtered in time to ensure the utmost accuracy) corrects the value assumed by the radioactive system according to its priority, adjusting it to the new condition.
  • the correction of quick variations of the level relies on the quick response of the radioactive system, which starts the regulation based on the reference determined by the thermal system as absolute value.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Toxicology (AREA)
  • Continuous Casting (AREA)

Claims (4)

  1. Verfahren zum Regeln der Füllstandhöhe von Stahl beim Stranggießen in einer Kokille, wobei ein Radioaktivitätsdetektor (17, 18) und ein thermischer Detektor (22) in der Nähe eines Füllstands (19) des mittels eines Gießkanals (15) der Kokille (13) zugeführten Stahls vorgesehen sind, dadurch gekennzeichnet, dass in einem ersten, anfänglichen Schritt zum Regulieren des Stranggießverfahrens der Radioaktivitätsdetektor (17, 18) mit einer hohen Erfassungsgexhwindigkeit bezüglich Änderungen der Füllstandshöhe (19) von Stahl betrieben wird und in einem zweiten Schritt im Beharrungszustand, sobald die anfänglichen Schwankungen geendet haben, der hochpräzise thermische Detektor (22) für die Füllstandhöhe des Stahles betrieben wird.
  2. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, dass der Radioaktivitätsdetektor (17, 18) eine Änderung eines radioaktiven Flusses erfasst, um die Änderung der Lage der Füllstandhöhe (19) des Stahles in der Kokille (13) zu signalisieren.
  3. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, dass der thermische Detektor (22) eine Temperaturänderung des Kupfers einer Wand (12) der Kokille (13) erfasst.
  4. Verfahren gemäß den Ansprüchen 1 bis 3, dadurch gekennzeichnet, dass ein zentraler Prozessor (21) Änderungssignale von den Detektoren (17, 18; 22) empfängt und eine Begrenzung oder eine Erhöhung der Stahlzufuhr aus dem Gießkanal (15) anweist, um die Füllstandhöhe (19) des Stahles konstant zu halten.
EP02076761A 2001-05-10 2002-05-03 Verfahren zum Regeln der Füllstandhöhe des Stahles in eine Stranggiesskokille Expired - Lifetime EP1256401B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2001MI000958A ITMI20010958A1 (it) 2001-05-10 2001-05-10 Procedimento e dispositivo per il controllo del livello dell'accaio in colata continua in lingotteria
ITMI20010958 2001-05-10

Publications (3)

Publication Number Publication Date
EP1256401A2 EP1256401A2 (de) 2002-11-13
EP1256401A3 EP1256401A3 (de) 2003-10-29
EP1256401B1 true EP1256401B1 (de) 2005-08-24

Family

ID=11447625

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02076761A Expired - Lifetime EP1256401B1 (de) 2001-05-10 2002-05-03 Verfahren zum Regeln der Füllstandhöhe des Stahles in eine Stranggiesskokille

Country Status (5)

Country Link
EP (1) EP1256401B1 (de)
AT (1) ATE302660T1 (de)
DE (1) DE60205675T2 (de)
ES (1) ES2248482T3 (de)
IT (1) ITMI20010958A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104889356B (zh) * 2014-03-05 2017-06-20 宝钢特钢有限公司 结晶器接收仪固定装置
CN114523082B (zh) * 2022-03-10 2023-08-18 云南曲靖钢铁集团凤凰钢铁有限公司 一种优特钢连铸工艺制造系统

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1558162A1 (de) * 1966-04-07 1970-03-19 Asea Ab Anordnung zur Regelung der Giessgeschwindigkeit
JPS5345774B2 (de) * 1973-03-06 1978-12-08
DE3509932A1 (de) * 1985-03-19 1986-10-02 Metacon AG, Zürich Verfahren zum anfahren einer stranggiessanlage
LU85878A1 (de) * 1985-05-07 1986-12-05 Arbed Verfahren zur automatischen steuerung des anfahrbetriebes einer metall-stanggiessanlage
JP3513381B2 (ja) * 1998-01-29 2004-03-31 新日本製鐵株式会社 鋳型内液面レベルの検出方法及び装置
JP2001287003A (ja) * 2000-04-07 2001-10-16 Nippon Steel Corp モールドレベル制御装置

Also Published As

Publication number Publication date
ITMI20010958A0 (it) 2001-05-10
ITMI20010958A1 (it) 2002-11-10
EP1256401A2 (de) 2002-11-13
EP1256401A3 (de) 2003-10-29
ES2248482T3 (es) 2006-03-16
DE60205675D1 (de) 2005-09-29
DE60205675T2 (de) 2006-06-14
ATE302660T1 (de) 2005-09-15

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