US3800853A - Submerged nozzle for continuous casting - Google Patents

Submerged nozzle for continuous casting Download PDF

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Publication number
US3800853A
US3800853A US00072692A US3800853DA US3800853A US 3800853 A US3800853 A US 3800853A US 00072692 A US00072692 A US 00072692A US 3800853D A US3800853D A US 3800853DA US 3800853 A US3800853 A US 3800853A
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US
United States
Prior art keywords
nozzle
ring
molten metal
slag
mold
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
US00072692A
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English (en)
Inventor
F Neumann
J Zeller
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 AG
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Filing date
Publication date
Application filed by Concast AG filed Critical Concast AG
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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
    • B22D41/505—Rings, inserts or other means preventing external nozzle erosion by the slag

Definitions

  • Nozzles with submerged outlets are used in continuous casting plants to prevent oxidation of the steel on its way from the tundish to the mold or from the ladle to the tundish.
  • the use of such nozzles also prevents slag particles and oxides from being washed into the liquid core of the strand.
  • the exterior of the nozzle will show signs of erosion at the level of the surface of the molten metal after relatively short casting times. This is primarily due to the corrosive effect of the slag formed by the powdered flux which is continuously agitated by the movement of the steel in the mold.
  • erosion phenomena may appear in the interior of the nozzle in the region of the outlet orifice, particularly when casting manganese alloyed steels. Such erosion phenomena often result in the nozzle breaking off where it has thus been weakened.
  • the object of the present invention is to reduce the exterior erosion of the nozzles caused by chemical and physical action of the slag at the surface of the molten metal and to compensate for erosion in the interior of the nozzles in the region of the nozzle outlet to prolong the life of such submerged nozzles.
  • this is achieved by concentrically locating a separate ring of refractory material around the nozzle. This ring extends downwards below the surface of the molten metal and upwards above the surface of the layer of slag.
  • the inside diameter of the ring may exceed the outside diameter of the nozzle by at least 2 mm.
  • the nozzles may be provided with protrusions which restrict the downward movement of the floating ring.
  • Any desired depth of immersion of the ring can be obtained regardless of its specific weight by fixing the ring in a position which is determined by the desired mold metal level.
  • the ring may thus be located by stops on the nozzle.
  • the ring When used with a nozzle having lateral outlets, the ring surrounds the outlet openings of the nozzle extending vertically downward from above the openings, to provide support for the wall of the nozzle and to compensate for'the effects of erosion in the outlet area.
  • the ring which may be threaded or otherwise secured to the nozzle, has openings which register with the nozzle outlet openings.
  • FIG. 1 is a vertical section of part of a tundish fitted with a nozzle that extends below the level of the molten metal in the mold.
  • FIG. 2 is a vertical section of the end of an alternative form of nozzle.
  • FIG. 3 is a section taken on the line III-III OF FIG. 2.
  • FIG. 4 is a section of the lower end of another form of nozzle.
  • FIG. 5 is a section of the lower end of yet another form of nozzle.
  • FIG. 6 is a section taken on the line VIVI of FIG. 5.
  • the floor of the tundish l is fitted with a tubular nozzle 2 which has an outlet below the surface 3 of the molten metal in a continuous casting mold 4.
  • the surface 3 of the molten metal is covered with slag 5 from a flux powder scattered on the surface of the molten metal.
  • a ring 6 of refractory material which is substantially concentric with the nozzle floats on the surface 3 of the molten metal and protects the nozzle surface from chemical and physical erosion caused by the slag 5. Sufficient clearance is provided to allow the floating ring to rise or fall freely as the level of the molten metal changes. The extent to which the ring 6 will be immersed below the surface of the molten metal will depend on its specific gravity.
  • the ring 6 In order to protect the nozzle surface from the corrosive layer of slag even above the layer of slag, the ring 6 preferably extends above the layer of slag 5 a distance that is usually several times the thickness of the layer of slag.
  • spare rings 6,6" may be mounted on the nozzle 2 before casting begins to serve as replacements, should the ring 6 be destroyed by wear.
  • Retaining means 7 which are shown schematically, hold the spare rings 6,6" above the level of the molten metal and layer of slag until they are needed.
  • FIG. 2 shows a form of nozzle 12 having two lateral outlet openings 13 below the level 3 of the molten metal.
  • a refractory ring 14 floats on the surface 3 of the molten metal.
  • the inner corners l5 and 16 of the ring 14 are rounded, and the inner surface 19 of the ring is curved convexly to facilitate sliding and to prevent jamming between the nozzle and the ring.
  • the clearance 20 between the nozzle and the ring should be at least 2 mm.
  • Stops 17 in the form of bosses located below the level of the molten metal, prevent the ring from slipping off the nozzle 12, should the surface of the molten metal drop accidentally. Spare rings 14' and 14' rest on stops l7 and 17".
  • FIG. 3 shows the stops 17 in section. They form bayonet joints with the recesses 18 in the rings l4, l4 and 14". The rings can thus be slid over the stops 17, 17 and 17" and are then turned by an angle of about 90 to become supported and retained by the next lower stop.
  • a ring 46 is mounted on a nozzle 2 which is provided with bosses 42 and 43 located, respectively, below and above the ring and which retain the ring in a predetermined location in relation to the desired mold metal level 3.
  • Ring 46 may, if desired, be provided with recesses similar to the recesses 18 of FIG. 3 to permit the ring to be moved up or down if necessary.
  • FIG. 5 shows a nozzle 12 which has threads 53 and two lateral outlets 13.
  • the ring 54 is threaded to the nozzle 12 and may be adjusted to a predetermined position in respect to the desired mold metal level 3.
  • the nozzle 2 may also have only one lateral outlet opening 13.
  • the ring 54 protects the exterior of the nozzle from the erosion by the slag 5 and also compensates for the interior erosion indicated by dashed lines 57 in the outlet region of the nozzle 2, which is particularly pronounced during longer casting times when casting manganese alloyed steels.
  • the ring 54 may be shaped like a cup, having a horizontal bottom part to provide additional protection against a vertical metal break-through at the bottom of the nozzle 12.
  • FIG. 6 shows a horizontal cross section of the nozzle 12 and of the ring 54 taken on the line VI--VI in FIG. 5.
  • the outlet openings 59 in the ring 54 match the outlet openings 13 of the nozzle 12.
  • other means of attachment such as a bayonet joint, may be used to keep the ring in the desired location against forces acting in the longitudinal axis of the nozzle.
  • the rings 6, 14, 46 and 54 are preferably made of a refractory material which is chemically neutral to the slag. Mixtures of graphite and clay, as are conventionally used for manufacturing nozzles, are quite suitable. Other refractory materials may also be used, but they should be selected with due regard to the composition of the slag and the quality of the steel to be cast. It has been found that the above described rings are exposed to much lower mechanical stresses than the nozzles and can therefore be manufactured of refractory materials with a lower mechanical strength.
  • the above described nozzles and rings may also be used between the ladle and the tundish.
  • the rings may have an oval or flattened cross section when they are used for casting strands of a small cross section.
  • Apparatus for protecting the inlet nozzle of a continuous casting machine from the corrosive and erosive effects of flux powder slag at the surface of the molten metal during the continuous casting of steel comprising a casting mold, a tubular nozzle extending into said mold having a discharge outlet adapted to be located below the level of the molten metal and slag in the mold, and a floating refractory ring surrounding said nozzle and concentric therewith, the interior surfaces of said ring being in close sliding relationship with the exterior surfaces of said nozzle and guided thereby but having clearance to permit said ring to rise and fall with changes in the level of the molten metal in the mold while preventing access of flux powder slag to the exterior of the nozzle during said rise and fall, said ring being adapted to extend downwardly below the level of the molten metal, and being adapted to extend upwardly above the level of the slag.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Devices For Medical Bathing And Washing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
US00072692A 1969-09-16 1970-09-16 Submerged nozzle for continuous casting Expired - Lifetime US3800853A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1393769A CH500790A (de) 1969-09-16 1969-09-16 Vorrichtung zum Giessen mit Giessrohren auf einer Stranggiessanlage für Stahl

Publications (1)

Publication Number Publication Date
US3800853A true US3800853A (en) 1974-04-02

Family

ID=4396622

Family Applications (1)

Application Number Title Priority Date Filing Date
US00072692A Expired - Lifetime US3800853A (en) 1969-09-16 1970-09-16 Submerged nozzle for continuous casting

Country Status (12)

Country Link
US (1) US3800853A (fr)
JP (1) JPS5339372B1 (fr)
AT (1) AT308300B (fr)
BE (1) BE755610A (fr)
CA (1) CA922867A (fr)
CH (1) CH500790A (fr)
DE (1) DE2042897C3 (fr)
ES (1) ES383931A1 (fr)
FR (1) FR2061732B1 (fr)
GB (1) GB1328700A (fr)
NL (2) NL141802B (fr)
ZA (1) ZA706251B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4257473A (en) * 1978-10-02 1981-03-24 Inland Steel Company Continuous casting shroud apparatus and method
US4401243A (en) * 1976-10-13 1983-08-30 Mannesmann Aktiengesellschaft Charging a mold for continuous casting
FR2763011A1 (fr) * 1997-05-07 1998-11-13 Vesuvius France Sa Installation de coulee d'un metal liquide et ensemble refractaire pour cette installation
CN104107886A (zh) * 2014-07-14 2014-10-22 张家港市广大机械锻造有限公司 一种新型中注管
US20220234100A1 (en) * 2021-01-28 2022-07-28 Resco Products, Inc. Refractory ring structure and related method
US11724308B2 (en) 2020-12-04 2023-08-15 Refractory Intellectual Property Gmbh & Co. Kg Refractory ring and refractory ring system and methods for assembling the same

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63303679A (ja) * 1987-06-05 1988-12-12 Toshiba Ceramics Co Ltd 鋳造用浸漬ノズル
DE4003608C1 (fr) * 1990-02-07 1991-06-27 Didier-Werke Ag, 6200 Wiesbaden, De
FR2670145B1 (fr) * 1990-12-06 1994-11-18 Vesuvius France Sa Procede de coulage d'un fluide dans un moule, dispositif et piece pour le procede et le dispositif.
GB2345015A (en) * 1998-12-23 2000-06-28 Didier Werke Ag Refractory shield for use in metal teeming

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2938251A (en) * 1956-08-27 1960-05-31 American Smelting Refining Metal distribution for continuous casting
US3050792A (en) * 1959-08-27 1962-08-28 Warner Mfg Corp Apparatus for continuous metal casting and parts thereof
US3349838A (en) * 1965-06-04 1967-10-31 American Smelting Refining Float control valve for continuous casting
US3370432A (en) * 1965-08-03 1968-02-27 Exxon Research Engineering Co Ice protective sleeve for pilings
US3392888A (en) * 1966-04-22 1968-07-16 Vesuvius Crucible Co Exothermically heated molten metal pouring nozzle
US3459346A (en) * 1966-10-18 1969-08-05 Metacon Ag Molten metal pouring spout

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2938251A (en) * 1956-08-27 1960-05-31 American Smelting Refining Metal distribution for continuous casting
US3050792A (en) * 1959-08-27 1962-08-28 Warner Mfg Corp Apparatus for continuous metal casting and parts thereof
US3349838A (en) * 1965-06-04 1967-10-31 American Smelting Refining Float control valve for continuous casting
US3370432A (en) * 1965-08-03 1968-02-27 Exxon Research Engineering Co Ice protective sleeve for pilings
US3392888A (en) * 1966-04-22 1968-07-16 Vesuvius Crucible Co Exothermically heated molten metal pouring nozzle
US3459346A (en) * 1966-10-18 1969-08-05 Metacon Ag Molten metal pouring spout

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4401243A (en) * 1976-10-13 1983-08-30 Mannesmann Aktiengesellschaft Charging a mold for continuous casting
US4257473A (en) * 1978-10-02 1981-03-24 Inland Steel Company Continuous casting shroud apparatus and method
FR2763011A1 (fr) * 1997-05-07 1998-11-13 Vesuvius France Sa Installation de coulee d'un metal liquide et ensemble refractaire pour cette installation
CN104107886A (zh) * 2014-07-14 2014-10-22 张家港市广大机械锻造有限公司 一种新型中注管
CN104107886B (zh) * 2014-07-14 2016-09-28 张家港市广大机械锻造有限公司 一种中注管
US11724308B2 (en) 2020-12-04 2023-08-15 Refractory Intellectual Property Gmbh & Co. Kg Refractory ring and refractory ring system and methods for assembling the same
US20220234100A1 (en) * 2021-01-28 2022-07-28 Resco Products, Inc. Refractory ring structure and related method
US11465200B2 (en) * 2021-01-28 2022-10-11 Resco Products, Inc. Refractory ring structure and related method

Also Published As

Publication number Publication date
NL7013468A (fr) 1971-03-18
DE2042897B2 (de) 1973-03-08
ZA706251B (en) 1971-12-29
GB1328700A (en) 1973-08-30
CA922867A (en) 1973-03-20
CH500790A (de) 1970-12-31
AT308300B (de) 1973-06-25
DE2042897A1 (de) 1972-02-03
ES383931A1 (es) 1973-03-01
FR2061732B1 (fr) 1975-01-10
FR2061732A1 (fr) 1971-06-25
JPS5339372B1 (fr) 1978-10-20
NL141802B (nl) 1974-04-16
DE2042897C3 (de) 1973-10-04
NL141802C (fr)
BE755610A (fr) 1971-02-15

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