EP0026487B1 - Verfahren zum Stahlstranggiessen - Google Patents

Verfahren zum Stahlstranggiessen Download PDF

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Publication number
EP0026487B1
EP0026487B1 EP80105844A EP80105844A EP0026487B1 EP 0026487 B1 EP0026487 B1 EP 0026487B1 EP 80105844 A EP80105844 A EP 80105844A EP 80105844 A EP80105844 A EP 80105844A EP 0026487 B1 EP0026487 B1 EP 0026487B1
Authority
EP
European Patent Office
Prior art keywords
mold
casting
continuous casting
value
steel
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
EP80105844A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0026487A1 (de
Inventor
Manfred Dr. Wolf
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 Concast AG
Original Assignee
Concast Holding 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 Concast Holding AG filed Critical Concast Holding AG
Priority to AT80105844T priority Critical patent/ATE2053T1/de
Publication of EP0026487A1 publication Critical patent/EP0026487A1/de
Application granted granted Critical
Publication of EP0026487B1 publication Critical patent/EP0026487B1/de
Expired 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds

Definitions

  • the invention relates to a method for the continuous casting of billets and blooms according to the preamble of claim 1 (DE-C 2415224).
  • the heat dissipation of the mold is e.g. determined by the heat absorbed by the cooling water and compared with a target value.
  • This target value depends on the carbon of the steel to be cast and the length of time of the strand in the mold.
  • the predetermined amount of the deviation which indicates a harmful change in the mold geometry, depends both on the casting conditions, in particular the casting speed and casting temperature, and on the quality requirements of the end product, such as with regard to rhomboidity, longitudinal edge cracks and transverse cracks. If there is a deviation of the measured value for heat dissipation from the target value by more than the predetermined amount, this is considered an indication of an insufficient mold geometry, and further measures must be taken to ensure a corresponding strand quality. Thus there is an ongoing possibility of checking the condition of a mold in the casting operation. As a result, strand damage that may occur can be recognized or prevented in good time due to an insufficient mold geometry.
  • the permissible deviation of the actual value from the specified target value is advantageously between 15 and 30% of the target value. Within this area, this depends on parameters such as casting speed or requirements on the strand quality.
  • the deviation is only slightly greater than the above-mentioned tolerable amount of 15 to 30%, it is advantageous to measure the mold after the current casting has ended and, if necessary, to replace it. Whether and when such a mold change takes place depends on internal quality criteria, which vary from plant to plant. In any case, a time-consuming measurement of the mold after each casting is no longer necessary and the time saved achieves an economic advantage.
  • the casting speed is advantageously reduced or the casting is stopped.
  • the amount of heat is H o (in 103 kcal. M-2), and on the abscissa on a logarithmic scale, the carbon contents for the most interesting range of unalloyed steels is between 0.03 and 1.0% by weight. Carbon applied.
  • the curve labeled 1 represents target values for the amount of heat to be dissipated as a function of the carbon content of the cast steel. This curve applies to a residence time of the cast strand or strand element in the mold of one minute.
  • the effective mold length (in m) divided by the casting speed (in m - min-l) is defined as the dwell time (in min).
  • the effective mold length in turn is the distance between the bath level of the strand being formed in the mold and the mold end.
  • This curve 1 also applies to billet and small blooms that are cast with oil lubrication in the mold.
  • the target value for the amount of heat to be dissipated according to the curve is approximately 10 3 ⁇ 57.3 kJoule ⁇ m -2 (13.7.103 kcal ⁇ m-2).
  • ⁇ 20% With a tolerated deviation of ⁇ 20% from this value, as a predetermined amount - this corresponds to roughly medium quality requirements for the steel to be cast - there is therefore a sufficient mold geometry when the amount of heat dissipated is between 46.0-68.6.10 3 kJoules ⁇ M -2 (11.0-16.4 ⁇ 10 3 kcal ⁇ m -2 ) is determined.
  • the amount of heat dissipated is 45.2.10 3 kJoule m- 2 (10.8.10 3 kcal m-2)
  • this is considered an indication of a disturbed, harmful mold geometry , and the mold is measured after the current casting is finished.
  • the measured value is, for example, significantly lower than the above-mentioned, tolerated lower limit of 46.6.10 3 kJoules.
  • m-2 (11.0 ⁇ 10 3 kcal.m-2), e.g.
  • H x is the specific value of the amount of heat dissipated in the mold (in 10 3 kcal ⁇ m-2)
  • H o is the target value for the amount of heat to be dissipated (in 10 3 kcal ⁇ m -2 ), depending on the carbon content of the cast Steel
  • t is the actual dwell time of a strand element in the mold (in min), this dwell time resulting from the effective mold length (in m) divided by the casting speed (in m ⁇ min-1).
  • the amount of heat dissipated can be determined by measuring the increase in temperature of the mold cooling water entering and leaving. The comparison of this amount of heat with the corresponding target values can be done manually using a predetermined diagram or using a comparator on an electronic basis. If the deviation is unauthorized, an optical or acoustic signal can be generated. Depending on the strength of this signal, the various measures, as described, can then be taken.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP80105844A 1979-10-02 1980-09-26 Verfahren zum Stahlstranggiessen Expired EP0026487B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80105844T ATE2053T1 (de) 1979-10-02 1980-09-26 Verfahren zum stahlstranggiessen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH887379A CH643764A5 (de) 1979-10-02 1979-10-02 Verfahren zur ueberwachung der kokillengeometrie beim stahlstranggiessen.
CH8873/79 1979-10-02

Publications (2)

Publication Number Publication Date
EP0026487A1 EP0026487A1 (de) 1981-04-08
EP0026487B1 true EP0026487B1 (de) 1982-12-22

Family

ID=4345718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80105844A Expired EP0026487B1 (de) 1979-10-02 1980-09-26 Verfahren zum Stahlstranggiessen

Country Status (8)

Country Link
US (1) US4300620A (enrdf_load_stackoverflow)
EP (1) EP0026487B1 (enrdf_load_stackoverflow)
JP (1) JPS5656767A (enrdf_load_stackoverflow)
AT (1) ATE2053T1 (enrdf_load_stackoverflow)
CA (1) CA1164625A (enrdf_load_stackoverflow)
CH (1) CH643764A5 (enrdf_load_stackoverflow)
DE (1) DE3061439D1 (enrdf_load_stackoverflow)
FI (1) FI65719C (enrdf_load_stackoverflow)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT372891B (de) * 1981-12-07 1983-11-25 Ver Edelstahlwerke Ag Verfahren zum horizontal-stranggiessen von metallen und legierungen, insbesondere von staehlen
CH658009A5 (de) * 1982-02-12 1986-10-15 Concast Service Union Ag Verfahren und plattenkokille zum kuehlen und stuetzen eines stranges in einer plattenkokille einer stahlstranggiessanlage.
JPS58148061A (ja) * 1982-02-26 1983-09-03 Kawasaki Steel Corp 連続鋳造におけるブレークアウト防止方法
US4580614A (en) * 1983-01-31 1986-04-08 Vereinigte Edelstahlwerke Aktiengesellschaft Cooling apparatus for horizontal continuous casting of metals and alloys, particularly steels
WO1992002324A1 (en) * 1990-08-09 1992-02-20 Voest-Alpine International Corp. An improved method for controlling the clamping forces exerted on a continuous casting mold
JP4764715B2 (ja) * 2005-12-13 2011-09-07 三島光産株式会社 連続鋳造方法
DE102006060673A1 (de) * 2006-11-02 2008-05-08 Sms Demag Ag Verfahren und Regelvorrichtung zum Regeln der Wärmeabfuhr einer Seitenplatte einer Kokille

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH552423A (de) * 1972-04-18 1974-08-15 Concast Ag Verfahren und vorrichtung zum steuern des waermeentzuges in kokillen beim stranggiessen.
CH558687A (de) * 1973-03-30 1975-02-14 Concast Ag Verfahren zum steuern der kuehlleistung von schmalseitenwaenden bei plattenkokillen beim stranggiessen und plattenkokille zur durchfuehrung des verfahrens.
JPS5584259A (en) * 1978-12-21 1980-06-25 Kawasaki Steel Corp Preventing method of breakout of slab at continuous casting

Also Published As

Publication number Publication date
EP0026487A1 (de) 1981-04-08
FI65719C (fi) 1984-07-10
CA1164625A (en) 1984-04-03
FI65719B (fi) 1984-03-30
CH643764A5 (de) 1984-06-29
JPS6330102B2 (enrdf_load_stackoverflow) 1988-06-16
DE3061439D1 (en) 1983-01-27
FI803081A7 (fi) 1981-04-03
JPS5656767A (en) 1981-05-18
US4300620A (en) 1981-11-17
ATE2053T1 (de) 1983-01-15

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