EP0128732A2 - Vorrichtungen beim Tundish-Giessen - Google Patents

Vorrichtungen beim Tundish-Giessen Download PDF

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Publication number
EP0128732A2
EP0128732A2 EP84303781A EP84303781A EP0128732A2 EP 0128732 A2 EP0128732 A2 EP 0128732A2 EP 84303781 A EP84303781 A EP 84303781A EP 84303781 A EP84303781 A EP 84303781A EP 0128732 A2 EP0128732 A2 EP 0128732A2
Authority
EP
European Patent Office
Prior art keywords
restrictor member
tundish
flow
outlet
metal
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.)
Withdrawn
Application number
EP84303781A
Other languages
English (en)
French (fr)
Other versions
EP0128732A3 (de
Inventor
John Purdie
Leonard Andrew Lock
James Monks
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.)
British Steel Corp
Original Assignee
British Steel Corp
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 British Steel Corp filed Critical British Steel Corp
Publication of EP0128732A2 publication Critical patent/EP0128732A2/de
Publication of EP0128732A3 publication Critical patent/EP0128732A3/de
Withdrawn legal-status Critical Current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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles

Definitions

  • This invention relates to Tundish Pouring.
  • this invention relates to apparatus and methods for tundish pouring where the tundish is arranged for pouring molten steel into a continuous casting slab or billet mould.
  • the rate of flow of the steel from the tundish during the initiation of the pour into the mould should be at a reduced rate by means of a variably engagable stopper so that more time is available for the steel at initiation of the pour to enable the steel adequately to freeze upon initiation of the withdrawal mechanism.
  • a tundish metal pouring apparatus including a tundish having at least one outlet in the base thereof through which molten metal is arranged to flow when being poured into a receiving container therebelow, the outlet having associated therewith an annular flow restrictor member through which the outflowing metal is arranged to pass, the flow restrictor member being of a meterial and a magnitude such as to be worn away by molten metal flow therethrough within a time range of between two to ten minutes.
  • the receiving container is a continuous casting mould, which may be for steel.
  • the flow restrictor member may be located within a flow metering nozzle in the tundish outlet or may be located within a submerged entry nozzle depending therefrom.
  • the restrictor member may be adapted to lodge within a tapering portion of the nozzle, and may be in the form of an annular disc.
  • the restrictor member may be formed of any suitable wearing material, and may be a refractory material such as fireclay.
  • the arrangement will desirably be such that the restrictor member has a life before it is fully worn away of between three to eight minutes.
  • An important feature in the operation of the apparatus and method of the invention is that it is the preferred practice to preheat for perhaps up to an hour's duration, the tundish outlet, including the nozzle and flow restrictor, prior to commencing the initiation of pouring so as to prevent any chilling and solidification of the steel upon initiation as it passes through the various parts of the outlet, which could otherwise risk blocking the outlet.
  • the flow restrictor is capable of withstanding such preheating without detrimental effect.
  • a metering nozzle 1 for a tundish outlet (not shown) comprises a phosphate bonded high alumina material body 2 having a zirconia-insert 3.
  • a rounded tapered inlet 4 to the nozzle is provided within which is located an annular fireclay rapid wearing disc 5 of approximately 3 to 4mm thickness which has an internal diameter of 18 to 16 mms.
  • the minimum internal diameter of the nozzle is of the order of 21.5mm.
  • the invention enables a significant reduction in flow rate during the first few minutes of continuous casting enabling adequate freezing of the metal within the mould before withdrawal of metal, after satisfactory solidification, from the bottom of the mould into the continuous casting strand. This is particularly useful when dealing with high carbon steel, such as steel above sixty carbon where the solidification is particularly broad.
  • seventy-five carbon steel can have a 80° temperature range for solidifying and it is highly desirable to ensure that adequate solidifying of the initial flow of steel into the continuous casting mould occurs.
  • Figure 2 The arrangement of Figure 2 is similar to that of Figure 1, except that in this case a submerged entry nozzle 6 for use below the outlet from a tundish is adapted to accommodate a fireclay annular disc 7, the submerged entry nozzle being arranged to seat against the lower surface of the tundish and protrude into and below the upper surface of steel in the continuous casting mould.
  • the invention includes within its scope a method of pouring molten metal from an outlet of a tundish into a container therebelow, the outlet having associated therewith an annular flow restrictor member, wherein the metal is arranged to pass through the flow restrictor member and wear it away within a time range of between two to ten minutes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)
EP84303781A 1983-06-07 1984-06-05 Vorrichtungen beim Tundish-Giessen Withdrawn EP0128732A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB838315575A GB8315575D0 (en) 1983-06-07 1983-06-07 Tundish pouring apparatus
GB8315575 1983-06-07

Publications (2)

Publication Number Publication Date
EP0128732A2 true EP0128732A2 (de) 1984-12-19
EP0128732A3 EP0128732A3 (de) 1985-10-02

Family

ID=10543905

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84303781A Withdrawn EP0128732A3 (de) 1983-06-07 1984-06-05 Vorrichtungen beim Tundish-Giessen

Country Status (3)

Country Link
EP (1) EP0128732A3 (de)
GB (2) GB8315575D0 (de)
ZA (1) ZA844166B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1000192A5 (fr) * 1986-03-05 1988-08-23 Didier Werke Ag Tube plongeur.
EP0519271A1 (de) * 1991-06-17 1992-12-23 Didier-Werke Ag Abstichorgan
EP0522346A1 (de) * 1991-07-09 1993-01-13 Dolomitwerke GmbH Verfahren zum offenen Stranggiessen von Metallschmelzen, Zwischengefäss und Verfahren zu seiner Herstellung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1650209A1 (de) * 1967-08-02 1970-09-10 Stiebel Werke Gmbh & Co Dr Vorrichtung zur selbsttaetigen Konstanthaltung einer Stroemungsmittel-Durchflussmenge
GB1196993A (en) * 1968-05-11 1970-07-01 Dyson Ltd J & J Improvements in Refractory Nozzles
US3889537A (en) * 1973-10-11 1975-06-17 Gen Electric Venturi arrangement
CH595160A5 (de) * 1975-07-18 1978-01-31 Concast Ag
GB2091399B (en) * 1981-01-20 1984-02-22 British Steel Corp Tundish pouring apparatus and method of use

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1000192A5 (fr) * 1986-03-05 1988-08-23 Didier Werke Ag Tube plongeur.
EP0519271A1 (de) * 1991-06-17 1992-12-23 Didier-Werke Ag Abstichorgan
EP0522346A1 (de) * 1991-07-09 1993-01-13 Dolomitwerke GmbH Verfahren zum offenen Stranggiessen von Metallschmelzen, Zwischengefäss und Verfahren zu seiner Herstellung

Also Published As

Publication number Publication date
GB8315575D0 (en) 1983-07-13
GB8414320D0 (en) 1984-07-11
EP0128732A3 (de) 1985-10-02
ZA844166B (en) 1984-12-24
GB2141060A (en) 1984-12-12

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19860603

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Inventor name: MONKS, JAMES

Inventor name: LOCK, LEONARD ANDREW

Inventor name: PURDIE, JOHN