EP0309433B1 - Verfahren zum Stranggiessen einer Metallschmelze - Google Patents

Verfahren zum Stranggiessen einer Metallschmelze Download PDF

Info

Publication number
EP0309433B1
EP0309433B1 EP88870150A EP88870150A EP0309433B1 EP 0309433 B1 EP0309433 B1 EP 0309433B1 EP 88870150 A EP88870150 A EP 88870150A EP 88870150 A EP88870150 A EP 88870150A EP 0309433 B1 EP0309433 B1 EP 0309433B1
Authority
EP
European Patent Office
Prior art keywords
continuous casting
lubricating agent
mold
molten metal
balls
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
EP88870150A
Other languages
English (en)
French (fr)
Other versions
EP0309433A2 (de
EP0309433A3 (en
Inventor
Jean-François Noville
Stéphan Wilmotte
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.)
Centre de Recherches Metallurgiques CRM ASBL
Original Assignee
Centre de Recherches Metallurgiques CRM ASBL
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 Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Priority to AT88870150T priority Critical patent/ATE85248T1/de
Publication of EP0309433A2 publication Critical patent/EP0309433A2/de
Publication of EP0309433A3 publication Critical patent/EP0309433A3/fr
Application granted granted Critical
Publication of EP0309433B1 publication Critical patent/EP0309433B1/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
    • B22D11/07—Lubricating the moulds

Definitions

  • the present invention relates to a process for the continuous casting of a molten metal, particularly but not exclusively of steel, according to the preamble of claim 1.
  • Continuous casting is a casting method, known for a long time, which consists in casting a molten metal, without interruption in a bottomless ingot mold.
  • the walls of the mold are cooled vigorously; this results in rapid cooling of the cast metal and the formation of a solidified skin whose thickness increases as the metal progresses in the mold.
  • the partially solidified ingot crosses a zone, called secondary cooling, where it continues and completes its solidification.
  • the ingot mold is generally driven by a vibration movement in the direction of its longitudinal axis.
  • the surface solidification of the metal in the ingot mold brings about the presence of two different metal surfaces, being at different temperatures and animated relative to each other in a discontinuous movement.
  • the contact area of these surfaces is the site of serious friction problems.
  • the cast metal has a relatively thick solidified skin, which is at a temperature lower than that of the molten metal.
  • the inner wall of the mold only undergoes reduced heating and, due to its vigorous cooling, its temperature remains below the melting point of the powder. This inner wall is thus covered with a layer of solidified powder which is formed at the expense of the film of lubricating agent and which consequently reduces its effectiveness.
  • the object of the present invention is to provide a method of the type which is mentioned in the introduction, but which does not have the disadvantages of implementation which have just been indicated.
  • the method of the invention poses no problem for ensuring a continuous supply of the lubricant, and it does not require preheating of the latter.
  • a process for the continuous casting of a molten metal in which a lubricant is introduced into the ingot mold, through at least one passage orifice formed in the wall of said ingot mold, is characterized in that the 'a lubricating agent is used in the form of substantially spherical balls, the diameter of which is not more than 1.5 mm.
  • the diameter of said balls is between 20 ⁇ m and 800 ⁇ m.
  • said beads consist of glass, and preferably of soda-lime glass.
  • This type of glass well known in the art, is used in particular for the manufacture of flat glass.
  • said lubricating agent has a temperature at the start of softening of between 400 ° C. and 800 ° C.
  • said balls of lubricating agent are introduced via conduits inserted into the walls of the mold and opening out in the interval between the wall of the mold and the cast metal.
  • the supply of balls of lubricating agent can be ensured by a natural flow.
  • the products obtained had a perfectly smooth surface, containing neither shrinkage cracks nor oscillation marks.
  • the process of the invention makes it possible to improve the surface quality of the continuously cast products; it also makes it possible to increase the speed of casting, without compromising the safety of casting, that is to say without increasing the risk of breakthroughs. It thus contributes to improving the productivity of casting installations.
  • the process of the invention poses no implementation problem, since the beads used constitute an industrial product available in a wide range of particle sizes. Because of their spherical shape, the balls flow without difficulty in the conduits and they do not present a risk of abrasion of the walls of the ingot mold, even in the event of incomplete melting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Lubricants (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (7)

  1. Verfahren zum Stranggießen eines geschmolzenen Metalls, bei dem man in die Kokille durch mindestens eine an der Wand der genannten Kokille ausgesparte Passieröffnung hindurch ein Schmiermittel einbringt, dadurch gekennzeichnet, daß man das Schmiermittel in Form von im wesentlichen runden Kügelchen mit einem Durchmesser von nicht größer als 1,5 mm einsetzt.
  2. Stranggußverfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Durchmesser der genannten Kügelchen zwischen 20 µm und 800 µm liegt.
  3. Stranggußverfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die genannten Kügelchen aus Glas bestehen.
  4. Stranggußverfahren nach Anspruch 3, dadurch gekennzeichnet, daß die genannten Kügelchen aus Natronkalkglas bestehen.
  5. Stranggußverfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das genannte Schmiermittel eine Erweichungsanfangstemperatur zwischen 400°C und 800°C besitzt.
  6. Stranggußverfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß man das genannte Schmiermittel unter Druck in die genannte(n) Passieröffnung(en) einbringt.
  7. Stranggußverfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß man die Zufuhrrate des Schmiermittels in Abhängigkeit der Zufuhrrate des geschmolzenen Metalls einstellt.
EP88870150A 1987-09-25 1988-09-15 Verfahren zum Stranggiessen einer Metallschmelze Expired - Lifetime EP0309433B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88870150T ATE85248T1 (de) 1987-09-25 1988-09-15 Verfahren zum stranggiessen einer metallschmelze.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8701090 1987-09-25
BE8701090A BE1000921A6 (fr) 1987-09-25 1987-09-25 Procede de coulee continue d'un metal fondu.

Publications (3)

Publication Number Publication Date
EP0309433A2 EP0309433A2 (de) 1989-03-29
EP0309433A3 EP0309433A3 (en) 1990-04-25
EP0309433B1 true EP0309433B1 (de) 1993-02-03

Family

ID=3882882

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88870150A Expired - Lifetime EP0309433B1 (de) 1987-09-25 1988-09-15 Verfahren zum Stranggiessen einer Metallschmelze

Country Status (5)

Country Link
EP (1) EP0309433B1 (de)
JP (1) JPH01107947A (de)
AT (1) ATE85248T1 (de)
BE (1) BE1000921A6 (de)
DE (1) DE3878121T2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5271452A (en) * 1987-03-26 1993-12-21 Sms Concast Inc. Continuous casting method and apparatus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1383305A (en) * 1971-03-01 1974-02-12 Bpb Industries Ltd Refractory insulation material
JPS5429967A (en) * 1977-08-08 1979-03-06 Tektronix Inc Storage target and storage tube using same
CH650425A5 (de) * 1981-05-21 1985-07-31 Alusuisse Kokille mit waermeisolierender schutzschicht.
JPS60221156A (ja) * 1984-04-17 1985-11-05 Kawasaki Steel Corp 連続鋳造方法
BE899544A (fr) * 1984-04-27 1984-08-16 Centre Rech Metallurgique Procede et dispositif pour la lubrification d'une lingotiere de couleecontinue.

Also Published As

Publication number Publication date
BE1000921A6 (fr) 1989-05-16
DE3878121T2 (de) 1993-08-19
DE3878121D1 (de) 1993-03-18
JPH01107947A (ja) 1989-04-25
ATE85248T1 (de) 1993-02-15
EP0309433A2 (de) 1989-03-29
EP0309433A3 (en) 1990-04-25

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