EP0049557A1 - Apparatus for strip casting having a heated orifice - Google Patents

Apparatus for strip casting having a heated orifice Download PDF

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Publication number
EP0049557A1
EP0049557A1 EP81302066A EP81302066A EP0049557A1 EP 0049557 A1 EP0049557 A1 EP 0049557A1 EP 81302066 A EP81302066 A EP 81302066A EP 81302066 A EP81302066 A EP 81302066A EP 0049557 A1 EP0049557 A1 EP 0049557A1
Authority
EP
European Patent Office
Prior art keywords
tundish
orifice passage
cavity
molten metal
lance
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Withdrawn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
EP81302066A
Other languages
German (de)
English (en)
French (fr)
Inventor
Nazmi Yusuf Toker
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.)
Allegheny Ludlum Steel Corp
Original Assignee
Allegheny Ludlum 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 Allegheny Ludlum Steel Corp filed Critical Allegheny Ludlum Steel Corp
Publication of EP0049557A1 publication Critical patent/EP0049557A1/en
Withdrawn legal-status Critical Current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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/064—Accessories therefor for supplying molten metal

Definitions

  • the present invention is directed to strip casting apparatus comprising an improved tundish assembly wherein an orifice of the tundish is able to be heated prior to and during a strip casting operation. More particularly, the present invention pertains to a heat conductive layer provided in the tundish at least at a location where reactive gases impinge against the tundish material.
  • the nozzle or orifice passage through which the molten metal passes to a casting surface is a critical feature.
  • the slot defining the orifice passage must have a substantially uniform width dimension across the longitudinal extent thereof.
  • the spacing of the orifice lips from a casting surface during a casting operation is also important.
  • the maintenance of the slot dimensions during a casting operation and minimizing the possibilities of the orifice passage freezing during a casting operation have become more critical considerations as the width of the strip material, and likewise the overall width of the orifice passage, . increases.
  • an apparatus for heating the orifice in a strip casting tundish includes at least one lance with the tip thereof disposed within a cavity in the tundish.
  • a new and improved apparatus for casting metallic strip material which permits heating of the orifice passage, yet ensures that the tundish materials are protected from flame abuse, chemical attack and the like as a result of the heating operation.
  • a strip casting apparatus able to heat the orifice passage without adversely affecting the tundish material during heating.
  • Another object of the present invention is to provide an improved strip casting apparatus in which at least one of the surfaces forming the orifice passage of the tundish may be continuously heated, before, during or after a casting operation without adversely affecting the tundish material.
  • Another object of the invention is to provide a heat conductive layer within the tundish at a location where reactive gases impinge against the tundish material which layer is able to protect the tundish material from flame effects and chemical attack, and yet promotes heat transfer therethrough to maintain the orifice passage in a heated condition.
  • Another object of this invention is to provide a strip casting apparatus in which the dimensions of the slot defining the orifibe- passage in the apparatus of the present invention can be adequately maintained even when relatively wide strip material is being cast.
  • the present invention provides strip casting apparatus comprising a tundish for receiving and holding molten metal, and an orifice passage defined between two spaced lips in the tundish through which the molten metal is delivered to a casting surface located within 3.048mm .(0.120 inch) .
  • the apparatus includes a tundish generally designated by reference numeral 10.
  • the tundish 10 has an internal cavity 12 also called the molten metal pouring passage.
  • Such passage 12 is identified by broken lines in the side elevation portion of Figures 1 and 3.
  • the internal cavity, or passage 12 is designed to receive and hold molten metal.
  • the tundish 10 further includes a nozzle or orifice passage 14, through which the molten metal in the tundish 10 is delivered to a casting surface 16.
  • the orifice passage 14 is defined between two lips; an upper lip 18 and a lower lip 19. As best shown in Figure 2, the lips 18 and 19 are substantially unformly spaced from one another across the longitudinal extent of the orifice passage at a width of at least 0.254mm (0.010 inch).
  • molten metal is delivered from the orifice passage 14 onto the outer peripheral surface 16 of a water cooled precipitation hardened copper alloy wheel containing about 99% copper.
  • Copper and copper alloys are chosen for their high thermal conductivity and wear resistance although other materials may be utilized for the casting surface 16.
  • the casting surface 16, whether round, flat or ovular, is movable past the nozzle at a speed of from 61 to 3048 metres (200 to 10,000 linear surface feet) per minute.
  • the tundish 10 may consist of at least one upper block 20 and at least one lower block 30.
  • the terms upper and lower, as well as the terms front and rear are used with general respect and reference to the casting surface 16, with the terms upper and rear referring to locations away from the casting surface 16.
  • the upper and lower blocks 20 and 30 of a preferred tundish 10 of the present invention are preferably vertically aligned and secured together. Such vertical alignment is discussed and explained in a co-filed patent application of the present applicants entitled "Apparatus For Strip Casting". It should be appreciated that the secured blocks must not allow molten metal in the passage 12 to pass through the interfaces of the assembly.
  • any number of intermediate blocks, such as blocks 22 and 24 may be disposed between the upper block 20 and the lower block 30 when a vertically aligned tundish is utilized. It should be understood that various alternative tundish designs may be employed such as horizontally aligned and secured blocks of molten metal resistent materials, or monolithic structures may be utilized.
  • the blocks utilized in . a preferred apparatus of the present invention must be of a material which is resistant to molten metal attack.
  • refractory boards such as insulating boards made from fiberized kaolin are suitable. Additional materials including graphite, alumina graphite, clay graphite, fire clay, quartz, boron nitride, silicon nitride, silicon carbide, boron carbide, alumina, zirconia, stabilized zirconium silicate, alumina,silica, magnesia, chrome magnesite and combinations of such materials may also be used to construct such blocks.
  • the tundish is constructed of vertically or horizontally stacked sections of 38mm (1.5 inch) thick Kaowool fiberboard.
  • 38mm (1.5 inch) thick blocks may be employed depending upon the desirable strip casting conditions.
  • the 38mm (1.5 inch) thick blocks are utilized in a preferred embodiment because of their commercial availability.
  • fiberized kaolin blocks are preferred because of their relatively low cost and because of the relative ease with which they can be drilled and carved into desired configurations.
  • other materials such as those enumerated above, may perform equally well and may be cast instead of carved into any desired configurations.
  • the tundish 10 typically includes a molten metal pouring passage 12 consisting of at least one introductory passage portion 32.
  • the introductory passage portion 32 extends through the tundish and is in communication with a base passage portion 34 formed in a hollow section at a lower portion of the tundish 10.
  • the opening for the introductory passage 32 is preferably located in an upper surface of the tundish as shown in Figures land 3. However, such opening may be disposed elsewhere. Also as shown in the Figures it is preferred that the opening be slightly radiused into a funnel shaped structure to facilitate metal transfer therethrough.
  • the base passage portion 34 and the orifice passage 14 are important features in the strip casting apparatus-of the present invention.
  • the base passage 34 is typically carved or cast in the bottom portion of the tundish 10.
  • the majority of a bottom surface 38 of the base passage 34 is preferably disposed below the vertical height of the orifice passage 14.
  • at least a portion of the bottom surface 38 of the base passage 34 is disposed at least 7.62mm (0.3 inch) below the nozzle 14.
  • the orifice passage 14 through which molten metal is fed onto a casting surface 16 has a substantially uniform width dimension, W, throughout the longitudinal extent thereof.
  • W width dimension
  • Such width dimension, W is at least 0.254mm (0.010 inch)and is less than 3.048mm (.120 inch), or more preferably less than 2.032mm (.080 inch).
  • width dimension, W is within the range of from 0.508mm to 1.524mm (0.020 to 0.060 inch), and even more preferably from 0.762 to 1.27mm (0.030 to 0.050 inch).
  • the orifice passage 14 may be constructed in a number of ways in the apparatus of the present invention.
  • at least one lip defining the orifice passage 14 consists of a molten metal resistant sheet or plate.
  • the orifice passage 14 may be formed between a bottom surface of a plate 40'defining the upper lip 18 of the nozzle 14, and a portion of the front wall of the tundish 10, defining the lower lip 19 of the nozzle 14.
  • the orifice passage 14 could alternatively be formed between a lower plate and the tundish 10, or between two facing plates. Regardless of which method is used to provide the orifice passage 14 the strict dimensional tolerances mentioned above must be maintained.
  • At least one cavity is provided in the tundish 10 adjacent at least a portion of the material defining at least one of the lips of the orifice passage 14.
  • Such cavity may consist of the bottom portion of a chimney or aperture 46 which is discussed below.
  • such cavity may be provided to extend between multiple apertures as shown in Figures 2 and 4.
  • such cavity may be provided in the tundish 10 across substantially the complete extent-of the material defining one of the lips of the orifice passage as shown in Figure 5.
  • a plate 40 and/or 70 defines at least one of the lips of the orifice passage.
  • a portion of the tundish material which is adjacent the outside surface of such plate with respect to the orifice passage 14. may be removed to provide the required cavity.
  • At least one surface forming the orifice passage 14 preferably comprises the bottom surface of a separate, molten metal resistant sheet or plate 40.
  • a separate, molten metal resistant sheet or plate 40 When employed, such plate 40 is integrally mounted or otherwise disposed in the tundish 10.
  • the upper lip 18, of the orifice passage 14 comprise a lower surface of a plate 40 of molten metal resistant material. It should.be understood that it is more critical to maintain the surface of the upper lip 18 of the orifice passage 14 during casting, as compared to the surface of the lower lip 19, and, therefore, it is preferable to use a molten metal resistant plate 40 at such location.
  • the bottom lip 19 or alternatively both lips 18 and 19 forming the orifice passage 14, such as shown in Figures 3 and 4, may consist of plates 40 and/or 70.
  • the plate 40 and/or 70 should be at least as resistant to the molten metal as is the remainder of the tundish material, and preferably, the plate comprises a material which is significantly more molten metal resistant than the remainder of the tundish 10.
  • the plate 40 may be fitted into an appropriate slot cut in the bottom surface of an intermediate block 24 of a tundish 10.
  • the plate 40 may comprise a block or portion of a block of the tundish 10.
  • the plate 40 should have a greater length than the longitudinal extent of the orifice passage 14.
  • the peripheral end portions of the plate 40 are sandwiched between adjacent blocks 24 and 30 in the assembly illustrated in Figures 1 and 2.
  • the tundish is primarily constructed of fiberized kaolin and has an orifice passage 14 defined by a boron nitride plate 40.
  • a boron nitride plate 40 other materials may be employed for the tundish and plate materials including silicon nitride, silicon carbide, boron carbide, silica, alumina, zirconia, stabilized zirconium silicate, graphite, alumina graphite, fire clay, clay graphite, quartz, magnesia, chrome magnesite, and combinations of such materials.
  • a lance or multiple lances are provided through the tundish 10 with their tips 44 extending into the cavity adjacent the orifice passage 14.
  • appropriate lances 42 extend into such cavity to heat the plate 40 forming the upper lip 18 of the orifice passage 14.
  • at least one lance 42 is disposed in the tundish with the tip 44 thereto directed into the cavity and toward the outside surface of the plate 40.
  • a corresponding aperture or chimney is provided in the tundish 10 through which the combustion products are delivered from the lance 42 may escape the cavity in the tundish
  • means may be provided to heat a cavity provided adjacent each of a pair of plates 40 and 70 forming both the upper lip 18 and the lower lip 19, of the orifice passage 14.
  • lances 42 discussed above for heating the upper lip 18 of the orifice, such construction would require at least one lance 72 disposed in the tundish 10 with the tip 74 thereof directed into a cavity adjacent the lower plate 7 0 to heat the lower lip 19 of the orifice passage 14.
  • a corresponding aperture or chimney 76 may be provided in the tundish 10 through which the combustion products which are delivered from the lance 72 to the cavity adjacent the plate 70 may escape the cavity in the tundish 10.
  • any number of lances or lances with any number of multiple tips may be employed usually dependent upon the width. of the strip to be cast from the tundish 10.
  • sufficient heat is provided and maintained in the cavity to cause heat transfer through the tundish materials to the corresponding lip of the orifice passage 14 to keep the nozzle hot before and during strip casting.
  • a plate 40 and/or 70 is utilized the temperature of the entire plate 40 can be raised to the desired level prior to the initiation of a strip casting operation.
  • a lance is provided for every 50 to 76mm ( 2.0 to-3.0 inches) of width of the orifice passage 14. It has been found that heating such plates near the melting temperature, i.e.
  • preheating of such plates at or near the metal casting temperature allows any expansion or contraction effects to occur and appropriate compensation to be made before casting begins. Therefore, preheating assures that the preset orifice dimension and the spacing from the casting surface remain established throughout the casting operation.
  • high temperature reactive gases are directed through the lance. Such reactive gases pass through the tip of the lance and the flames are directed into the cavity and toward the material defining that lip of the orifice passage 14.
  • Preferred reactive gases include acetylene-air, acetylene-oxygen and natural gas-oxygen mixtures.
  • a more resistant heat conductive layer 48 and/or 7& is provided on at least a portion of the upper surface of the upper plate 40 and the lower surface of the lower plate 70 at least at the location where such flames impinge against the plate 40 and/or 70.
  • Such layer 48 serves to absorb the flame abuse, including restricting chemical attack, and further serves to transfer the heat to and through the plate 40 and/or 70.
  • such layer 48 is from 4.76 to 6.35mm (0.1875 to 0.25 inch) thick graphite, although other materials may be employed.
  • a protective layer, or multiple layers may be applied to a boron nitride plate by using graphite bearing cements or other refractory coating substances.
  • the heat conductive layer of the present invention includes those materials which absorb thermal and chemical abuse, and are functionally able to transfer heat therethrough as discussed above.
  • a drain plug 62 may be provided in a lower portion of the tundish. Such drain plug is preferably located vertically below the orifice passage or nozzle 14 with respect to the force of gravity.
  • the purpose of the drain plug 62 is.to quickly stop molten metal from being delivered from the orifice passage 14 when it is desired to stop a casting operation. It will be appreciated by those skilled in this art that it-is important to stop a casting operation as quickly as possible. Otherwise, uneven and often intermittent streams of molten metal may flow through the nozzle 14 at the end of a casting operation and such intermittent streams may impinge onto the fapidly moving casting surface without the control necessary to make strip material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Coating Apparatus (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
EP81302066A 1980-10-06 1981-05-08 Apparatus for strip casting having a heated orifice Withdrawn EP0049557A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US19409680A 1980-10-06 1980-10-06
US194096 1980-10-06

Publications (1)

Publication Number Publication Date
EP0049557A1 true EP0049557A1 (en) 1982-04-14

Family

ID=22716283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81302066A Withdrawn EP0049557A1 (en) 1980-10-06 1981-05-08 Apparatus for strip casting having a heated orifice

Country Status (13)

Country Link
EP (1) EP0049557A1 (enrdf_load_stackoverflow)
JP (1) JPS5764456A (enrdf_load_stackoverflow)
KR (1) KR830005933A (enrdf_load_stackoverflow)
AU (1) AU6997081A (enrdf_load_stackoverflow)
BR (1) BR8102813A (enrdf_load_stackoverflow)
CA (1) CA1178018A (enrdf_load_stackoverflow)
ES (1) ES502055A0 (enrdf_load_stackoverflow)
HU (1) HU183421B (enrdf_load_stackoverflow)
MX (1) MX155525A (enrdf_load_stackoverflow)
NO (1) NO160121C (enrdf_load_stackoverflow)
PL (1) PL136654B1 (enrdf_load_stackoverflow)
RO (1) RO83016B (enrdf_load_stackoverflow)
SU (1) SU1205752A3 (enrdf_load_stackoverflow)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB521689A (en) * 1938-08-22 1940-05-29 Joseph Marcel Merle Improvements relating to apparatus for making products derived from molten metal
US4142571A (en) * 1976-10-22 1979-03-06 Allied Chemical Corporation Continuous casting method for metallic strips
EP0040072B1 (en) * 1980-05-09 1984-05-30 Battelle Development Corporation Apparatus for strip casting

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB521689A (en) * 1938-08-22 1940-05-29 Joseph Marcel Merle Improvements relating to apparatus for making products derived from molten metal
US4142571A (en) * 1976-10-22 1979-03-06 Allied Chemical Corporation Continuous casting method for metallic strips
EP0040072B1 (en) * 1980-05-09 1984-05-30 Battelle Development Corporation Apparatus for strip casting

Also Published As

Publication number Publication date
RO83016B (ro) 1984-01-30
SU1205752A3 (ru) 1986-01-15
ES8307139A1 (es) 1983-06-16
BR8102813A (pt) 1982-08-24
KR830005933A (ko) 1983-09-14
NO811581L (no) 1982-04-07
NO160121C (no) 1989-03-15
PL136654B1 (en) 1986-03-31
CA1178018A (en) 1984-11-20
HU183421B (en) 1984-05-28
NO160121B (no) 1988-12-05
JPS5764456A (en) 1982-04-19
PL231040A1 (enrdf_load_stackoverflow) 1982-04-13
RO83016A (ro) 1984-01-14
JPH0341260B2 (enrdf_load_stackoverflow) 1991-06-21
AU6997081A (en) 1982-04-22
MX155525A (es) 1988-03-24
ES502055A0 (es) 1983-06-16

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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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AK Designated contracting states

Designated state(s): BE DE FR GB IT SE

17P Request for examination filed

Effective date: 19820827

STAA Information on the status of an ep patent application or granted ep patent

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18W Application withdrawn

Withdrawal date: 19841124

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TOKER, NAZMI YUSUF