EP0083920A2 - Procédé pour la coulée d'aciers à teneurs en aluminium relativement élevées dans des installations de coulée continue de billettes - Google Patents

Procédé pour la coulée d'aciers à teneurs en aluminium relativement élevées dans des installations de coulée continue de billettes Download PDF

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Publication number
EP0083920A2
EP0083920A2 EP83100005A EP83100005A EP0083920A2 EP 0083920 A2 EP0083920 A2 EP 0083920A2 EP 83100005 A EP83100005 A EP 83100005A EP 83100005 A EP83100005 A EP 83100005A EP 0083920 A2 EP0083920 A2 EP 0083920A2
Authority
EP
European Patent Office
Prior art keywords
aluminum
tundish
casting
pan
amount
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
EP83100005A
Other languages
German (de)
English (en)
Other versions
EP0083920A3 (en
EP0083920B1 (fr
Inventor
Dietfried Reiber
Klaus Längauer
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.)
Von Roll AG
Original Assignee
Von Roll 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4179430&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0083920(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Von Roll AG filed Critical Von Roll AG
Priority to AT83100005T priority Critical patent/ATE23463T1/de
Publication of EP0083920A2 publication Critical patent/EP0083920A2/fr
Publication of EP0083920A3 publication Critical patent/EP0083920A3/de
Application granted granted Critical
Publication of EP0083920B1 publication Critical patent/EP0083920B1/fr
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material

Definitions

  • the invention relates to a method for casting steel with over 0.02% metallic aluminum on billet continuous casting plants with free-running, calibrated tundish nozzles.
  • aluminum oxide compounds can be modified in the treatment of the liquid melt with alloys and / or slags of the metals calcium and magnesium.
  • the addition is expediently carried out by blowing into the casting ladle by means of an immersion lance.
  • Argon is normally used as the carrier gas.
  • ladle metallurgical treatment it is common to protect the melt in the ladle from further oxidation, e.g. thanks to protective gas, vacuum, special pan lid, keeping slag free, special slag compositions, pan deliveries made of refractories with low oxygen potential.
  • a method known from DE-AS 25 27 156 for preventing the addition of immersion spouts, as are usually used in bloom and slab caster systems, consists in "overblowing" the melt with calcium treatment agents. When “overblown”, aluminum oxide compounds are largely reduced to calcium oxide, which is said to be completely separated.
  • the invention is based on the object of metering the Ca amount in such a way that only liquid aluminum oxide compounds occur when casting steels with higher contents of metallic aluminum on billet continuous casting plants.
  • the melt is not overblown, but that the amount of solids blown in is matched precisely to the steel composition before the blown-in treatment, in particular to the Oxygen content (carbon content). It is advisable to determine the free oxygen content of the melt in the pan after adding Al and before blowing in; if this is higher than 15 ppm, additional aluminum (per ppm O 2 3.0 ppm Al) must be added.
  • the composition of the inclusion compounds calcium oxide - aluminum oxide is controlled so that - if there are no defined purity level requirements - a large part of the known fine grain steels can be cast between the ladle and the tundish without reoxidation protection.
  • this limit is already 0.020% Al. It may then be advisable to additionally seal the tundish airtight using a lid and before pouring it on using inert gases such as e.g. Keep nitrogen or argon oxygen free.
  • inert gases such as e.g. Keep nitrogen or argon oxygen free.
  • the reoxidation protection can consist of a known shadow pipe.
  • synthetic slags with a low oxidation potential for example Ca O with about 30% A1 2 ° 3 content, are additionally used to cover the steel surface in the tundish.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Continuous Casting (AREA)
EP83100005A 1982-01-08 1983-01-03 Procédé pour la coulée d'aciers à teneurs en aluminium relativement élevées dans des installations de coulée continue de billettes Expired EP0083920B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83100005T ATE23463T1 (de) 1982-01-08 1983-01-03 Verfahren zum giessen von staehlen mit hoeheren aluminiumgehalten auf knueppelstranggiessanlagen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH107/82 1982-01-08
CH10782 1982-01-08

Publications (3)

Publication Number Publication Date
EP0083920A2 true EP0083920A2 (fr) 1983-07-20
EP0083920A3 EP0083920A3 (en) 1983-10-26
EP0083920B1 EP0083920B1 (fr) 1986-11-12

Family

ID=4179430

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83100005A Expired EP0083920B1 (fr) 1982-01-08 1983-01-03 Procédé pour la coulée d'aciers à teneurs en aluminium relativement élevées dans des installations de coulée continue de billettes

Country Status (3)

Country Link
EP (1) EP0083920B1 (fr)
AT (1) ATE23463T1 (fr)
DE (1) DE3367542D1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2636400A1 (de) * 1976-08-11 1978-02-16 Mannesmann Ag Verfahren zur verbesserung der kristallstruktur von im strang abgegossenem stahl
DE2527156B2 (de) * 1975-06-18 1980-09-04 Thyssen Niederrhein Ag Huetten- Und Walzwerke, 4200 Oberhausen Verfahren zur Vorbehandlung einer Stahlschmelze beim Stranggießen
US4317678A (en) * 1980-09-26 1982-03-02 Union Carbide Corporation Process for continuous casting of aluminum-deoxidized steel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2527156B2 (de) * 1975-06-18 1980-09-04 Thyssen Niederrhein Ag Huetten- Und Walzwerke, 4200 Oberhausen Verfahren zur Vorbehandlung einer Stahlschmelze beim Stranggießen
DE2636400A1 (de) * 1976-08-11 1978-02-16 Mannesmann Ag Verfahren zur verbesserung der kristallstruktur von im strang abgegossenem stahl
US4317678A (en) * 1980-09-26 1982-03-02 Union Carbide Corporation Process for continuous casting of aluminum-deoxidized steel

Also Published As

Publication number Publication date
ATE23463T1 (de) 1986-11-15
EP0083920A3 (en) 1983-10-26
EP0083920B1 (fr) 1986-11-12
DE3367542D1 (en) 1987-01-02

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