US3648761A - Apparatus for distributing molten steel in a mold for a continuous casting - Google Patents

Apparatus for distributing molten steel in a mold for a continuous casting Download PDF

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Publication number
US3648761A
US3648761A US58525A US3648761DA US3648761A US 3648761 A US3648761 A US 3648761A US 58525 A US58525 A US 58525A US 3648761D A US3648761D A US 3648761DA US 3648761 A US3648761 A US 3648761A
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US
United States
Prior art keywords
mold
steel
pipe
chamber
cross
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
US58525A
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English (en)
Inventor
Georg Speith
Helmut Landgraf
Herbert Forster
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
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Publication of US3648761A publication Critical patent/US3648761A/en
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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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles

Definitions

  • ABSTRACT A mold for continuous casting of steel is charged through a pipe into which steel is poured.
  • the pipe terminates in a chamber underneath the surface level of molten steel in the mold.
  • the chamber has two upwardly and oppositely directed ducts of converging cross section but having exit openings larger than the pipes diameter for directing branch flows toward a region that is somewhat below the surface level where meeting the sidewalls of the mold.
  • the chamber itself provides for sudden enlargement of cross section as to down flow of steel in the pipe and the bottom operates as flow redirecting baffle.
  • the present invention relates to apparatus for distributing molten steel in the mold of a continuous casting apparatus so as to reduce the content of nonmetallic impurities and inclusions in the casting.
  • the invention relates particularly to redirecting a free falling flow of steel as poured into the mold, to be divided in branch flows and redirected underneath the surface level of the molten steel as contained in the mold.
  • a tubular or pipe member is provided underneath a ladle from which steel to be cast is poured into the mold.
  • the pipe has an inner diameter larger than the diameter of the pour opening in the ladle.
  • the pipe projects into the mold and terminates in a chamber underneath the surface level of the molten steel in the mold.
  • the chamber is provided with exit ducts, that are submerged accordingly.
  • the chamber itself is essentially defined by two back to back, oppositely and upwardly directed ducts which, in turn, are defined as follows.
  • the pipe guiding descending flow of steel terminates at a more or less horizontally extending upper wall portion of chamber and ducts; the bottom of chamber and ducts are defined by wall sections inclined to each other to establish the upward component of the ducts, causing redirection of the vertical influx of steel into the chamber by about I to 150. Also, the two ducts divide the flow of steel in two branch streams directed toward opposite sides of the mold. The cross sections of the exits of the ducts are larger than the inner cross section of the pipe.
  • the cross section of the ducts along the respective axes as to flow therein reduce in direction of flow which improves the redirecting characteristics and control of mean flow of this arrangement.
  • the chamber itself defines a flow path for the downwardly flowing steel that increases in cross section underneath the lower end of the pipe.
  • the bottom of the chamber defines a flow redirecting baffle for establishing a collection chamber for the poured-in steel. Either provision, redirecting baffle and enlargement of cross section for the down flow reduces the kinetic energy of the falling liquid and avoids turbulence in the two branch streams as redirected through the rather wide ducts into the mold cavity.
  • FIGURE illustrates a cross section through salient portions of an apparatus for continuous casting of steel improved in accordance with the preferred embodiment of the invention.
  • the figure shows a casting ladle l with a bottom opening II through which molten steel pours into a mold 2, provided for continuous casting.
  • Support and withdrawal rolls 3 guide a casting string 4 from the bottom of the mold. Additional rolls are provided further down stream for guiding and supporting the casting.
  • String 4 as formed in the mold 2 and as withdrawn therefrom includes a still liquidous core and a solidified skin.
  • the surface of molten steel in the mold is covered by means of a layer 6 of powder.
  • the molten steel itself has a surface level 5 in the mold.
  • Pipe 7 establishes a vertical duct having width (diameter) larger than the pour opening I I of ladle I and larger even than the diameter of the stream of falling steel.
  • the pipe 7 extends sufficiently far into the mold so as to extend and to continue underneath the surface level 5 of the molten steel. Thus, that submerged portion of pipe 7 defines a descending flow path of diameter wider than the stream as falling and as poured from the ladle.
  • Pipe 7 terminates in a chamber 8, made of the same material and, possibly, being integral with pipe 7.
  • Chamber 8 is established by a horizontally and laterally extending wall portion I2 in which pipe 7 terminates from above.
  • Chamber 8 is further defined by a particularly shaped bottom 9.
  • Upper wall 12 and bottom 9 together with sidewalls (not shown) provide two channels or flow ducts l0 and 10a which extend essentially away from each other and establish branch flow paths of the molten steel. in essence, chamber 8 is established by these two ducts.
  • Each duct provides a flow path for steel from chamber 8 into mold 2.
  • the two ducts are disposed back to back with common entrance and converging cross sections towards exits I3 and 13a.
  • the exit openings of 13 and 13a of ducts I0 and 100, respectively, are larger in cross section than the cross section of pipe 8, even though the ducts width reduces along their respective axes.
  • the lower portions of the ducts as particularly defined by bottom 9 of chamber 8 are inclined to each other and to the horizontal by an angle a.
  • Angle a is shown to be equal to 30. This corresponds to an angle of about I20 as between the vertical direction of the free falling stream as entering mold and chamber, and the redirectioning as resulting from the two ducts I0 and 10a.
  • the exit openings I3 and 13a of ducts l0 and Illa, respectively are above lowest portion of the bottom of chamber 7. It was found that the redirecting angle should be from to lSO".
  • the chamber 8 provides for sudden enlargement of cross section for the flow of steel as descending in pipe 7. Moreover, bottom 9 establishes a baffle across the path of the descending steel.
  • chamber 7 as a redirecting collection chamber, in which turbulence and vorticity is reduced; the turbulence results from the rather high entrance velocity of the falling stream. Also, kinetic energy of free fall is considerably reduced in the chamber so that, as a consequence, the flow of steel out of the chamber, near and through exits I3 and 13a, is rather smooth and quiet, charging the mold throughout with steel by means of low turbulence flow.
  • chamber 8 dips into the mold for a particular depth that depends upon the width Blof the mold and also upon the angle a, as that angle determines materially the direction of outflow of steel from the chamber and the degree of redirection imparted upon the vertically entering stream of steel. The relationship was found to be therefor:
  • h Bl2 tan u-l-a. wherein the constant a is about 50 to 150 mm.; if Bis given in millimeters, the depth it can be calculated in this dimension.
  • n represents that average distance from the surface. lt should be mentioned that in view of the relative shonness of the ducts and 100, the directions of mean flow, as leaving the ducts, are predominantly determined by the inclination of the bottom portion of chamber 8.
  • the dotted lines with arrows show the direction of flow in the mold as resulting from charging the mold through the particularly oriented channels 10 and 100.
  • the illustrated flow lines demonstrate that each branch flow is again divided in two components. One component flows down along the respective sidewall of the mold. The other component flows underneath surface level 5 toward the center, to be redirected again for descend.
  • underneath chamber 8 there is a rather uniform descending flow.
  • the down flow exhibits rather uniformly constant speed of descend. That speed is equal to the speed of withdrawal of the casting string.
  • the uniformity in descend facilitates rising of oxide particles in the liquidous steel.
  • the upper wall portions and the two bottom wall portions extending laterally beyond the inner diameter of the pipe member and forming two flow directing ducts having exits for redirecting the flow of steel in the chamber upwardly and laterally towards the side of the mold, the ducts together having cross section larger than the cross section of said pipe member.
  • the chamber defining means as suspended from the pipe underneath the surface level of the molten steel in the mold having position to direct flow from the channels toward areas of the sidewall of the mold somewhat underneath the surface level thereat.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)
US58525A 1969-07-29 1970-07-27 Apparatus for distributing molten steel in a mold for a continuous casting Expired - Lifetime US3648761A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691939170 DE1939170B2 (de) 1969-07-29 1969-07-29 Einrichtung zum verteilen einer schmelze in einer anlage zum stranggiessen von stahl

Publications (1)

Publication Number Publication Date
US3648761A true US3648761A (en) 1972-03-14

Family

ID=5741621

Family Applications (1)

Application Number Title Priority Date Filing Date
US58525A Expired - Lifetime US3648761A (en) 1969-07-29 1970-07-27 Apparatus for distributing molten steel in a mold for a continuous casting

Country Status (7)

Country Link
US (1) US3648761A (enrdf_load_stackoverflow)
JP (1) JPS4926418B1 (enrdf_load_stackoverflow)
DE (1) DE1939170B2 (enrdf_load_stackoverflow)
FR (1) FR2053235B1 (enrdf_load_stackoverflow)
GB (1) GB1305295A (enrdf_load_stackoverflow)
NL (1) NL7010806A (enrdf_load_stackoverflow)
ZA (1) ZA705062B (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3814167A (en) * 1971-06-04 1974-06-04 Es Alpine Montan Ag Process for separating non-metallic inclusions from hot liquid metal
US3865175A (en) * 1972-02-03 1975-02-11 Voest Ag Process for separating non-metallic inclusions from hot liquid metal
US3867978A (en) * 1973-04-12 1975-02-25 Concast Inc Method and apparatus for introduction of steel into a continuous casting mold
US3935895A (en) * 1973-06-14 1976-02-03 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Continuous steel casting method
US3995682A (en) * 1973-05-07 1976-12-07 Concast Ag Continuous casting apparatus with pour tube having lateral slot-like openings
JPS5213431A (en) * 1975-07-24 1977-02-01 Akechi Taikarenga Kk Pouring inlet for metal melts to turndish
US4498661A (en) * 1981-04-23 1985-02-12 Kobzar Vladimir E Teeming ladle
US4819840A (en) * 1986-07-12 1989-04-11 Thyssen Stahl Aktiengesellschaft Refractory submerged pouring nozzle
US6102260A (en) * 1996-11-21 2000-08-15 Psc Technologies, Inc. Impact pad
US6156260A (en) * 1996-11-21 2000-12-05 Psc Technologies, Inc. Chamber for reception, lateral division and redirection of liquid metal flow
US20040159987A1 (en) * 2003-02-14 2004-08-19 Bederka Daniel J. Submerged entry nozzle and method for maintaining a quiet casting mold

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4926125A (enrdf_load_stackoverflow) * 1972-07-05 1974-03-08
JPS5546364Y2 (enrdf_load_stackoverflow) * 1973-07-20 1980-10-30
FR2525937A1 (fr) * 1982-05-03 1983-11-04 Fives Cail Babcock Dispositif d'introduction d'un metal liquide dans une lingotiere de coulee continue de brames
DE3811751A1 (de) * 1988-04-08 1989-10-19 Schloemann Siemag Ag Tauchgiessrohr zum einleiten von metallschmelze in eine metallbandgiesskokille
SI1506827T1 (sl) * 2003-08-01 2006-02-28 Hof Te Fiennes N V Livni sistem in postopek za litje nezeleznih kovinskih talin
JP6135708B2 (ja) * 2015-05-13 2017-05-31 品川リフラクトリーズ株式会社 連続鋳造用の浸漬ノズル及び浸漬ノズルを用いた連続鋳造方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE843137C (de) * 1942-04-14 1952-07-07 Wieland Werke Ag Rohrzufuehrung fuer das schmelzfluessige Giessgut beim stetigen Giessen von Metallen
CH361888A (de) * 1956-07-18 1962-05-15 Wieland Werke Ag Durchlaufkokille zum Stranggiessen von metallischen Werkstoffen und Verfahren zum Betrieb dieser Kokille
AT228418B (de) * 1959-10-13 1963-07-10 Beteiligungs & Patentverw Gmbh Stranggießvorrichtung
US3340924A (en) * 1964-09-10 1967-09-12 Kennecott Copper Corp Apparatus for continuous casting of hollow billets
US3371704A (en) * 1967-02-20 1968-03-05 Astrov Evgeny Ivanovitch Device for supplying molten metal into a mould of a continuous casting machine
US3465811A (en) * 1965-11-15 1969-09-09 Est Aciers Fins Plants for the continuous casting of steel
US3517726A (en) * 1969-08-04 1970-06-30 Inland Steel Co Method of introducing molten metal into a continuous casting mold

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE863119C (de) * 1942-12-03 1953-01-15 Ver Leichtmetall Werke Ges Mit Verfahren und Vorrichtung zum Verteilen des Metalls beim gleichzeitigen Giessen mehrerer Straenge

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE843137C (de) * 1942-04-14 1952-07-07 Wieland Werke Ag Rohrzufuehrung fuer das schmelzfluessige Giessgut beim stetigen Giessen von Metallen
CH361888A (de) * 1956-07-18 1962-05-15 Wieland Werke Ag Durchlaufkokille zum Stranggiessen von metallischen Werkstoffen und Verfahren zum Betrieb dieser Kokille
AT228418B (de) * 1959-10-13 1963-07-10 Beteiligungs & Patentverw Gmbh Stranggießvorrichtung
US3340924A (en) * 1964-09-10 1967-09-12 Kennecott Copper Corp Apparatus for continuous casting of hollow billets
US3465811A (en) * 1965-11-15 1969-09-09 Est Aciers Fins Plants for the continuous casting of steel
US3371704A (en) * 1967-02-20 1968-03-05 Astrov Evgeny Ivanovitch Device for supplying molten metal into a mould of a continuous casting machine
US3517726A (en) * 1969-08-04 1970-06-30 Inland Steel Co Method of introducing molten metal into a continuous casting mold

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3814167A (en) * 1971-06-04 1974-06-04 Es Alpine Montan Ag Process for separating non-metallic inclusions from hot liquid metal
US3865175A (en) * 1972-02-03 1975-02-11 Voest Ag Process for separating non-metallic inclusions from hot liquid metal
US3867978A (en) * 1973-04-12 1975-02-25 Concast Inc Method and apparatus for introduction of steel into a continuous casting mold
US3995682A (en) * 1973-05-07 1976-12-07 Concast Ag Continuous casting apparatus with pour tube having lateral slot-like openings
US3935895A (en) * 1973-06-14 1976-02-03 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Continuous steel casting method
JPS5213431A (en) * 1975-07-24 1977-02-01 Akechi Taikarenga Kk Pouring inlet for metal melts to turndish
US4498661A (en) * 1981-04-23 1985-02-12 Kobzar Vladimir E Teeming ladle
US4819840A (en) * 1986-07-12 1989-04-11 Thyssen Stahl Aktiengesellschaft Refractory submerged pouring nozzle
US6102260A (en) * 1996-11-21 2000-08-15 Psc Technologies, Inc. Impact pad
US6156260A (en) * 1996-11-21 2000-12-05 Psc Technologies, Inc. Chamber for reception, lateral division and redirection of liquid metal flow
US20040159987A1 (en) * 2003-02-14 2004-08-19 Bederka Daniel J. Submerged entry nozzle and method for maintaining a quiet casting mold
US6932250B2 (en) 2003-02-14 2005-08-23 Isg Technologies Inc. Submerged entry nozzle and method for maintaining a quiet casting mold

Also Published As

Publication number Publication date
JPS4926418B1 (enrdf_load_stackoverflow) 1974-07-09
FR2053235B1 (enrdf_load_stackoverflow) 1973-07-13
NL7010806A (enrdf_load_stackoverflow) 1971-02-02
ZA705062B (en) 1971-04-28
GB1305295A (enrdf_load_stackoverflow) 1973-01-31
DE1939170A1 (enrdf_load_stackoverflow) 1971-04-22
DE1939170B2 (de) 1971-04-22
FR2053235A1 (enrdf_load_stackoverflow) 1971-04-16

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