WO2005077570A1 - A method and apparatus for continuously casting steel strip - Google Patents
A method and apparatus for continuously casting steel strip Download PDFInfo
- Publication number
- WO2005077570A1 WO2005077570A1 PCT/AU2005/000186 AU2005000186W WO2005077570A1 WO 2005077570 A1 WO2005077570 A1 WO 2005077570A1 AU 2005000186 W AU2005000186 W AU 2005000186W WO 2005077570 A1 WO2005077570 A1 WO 2005077570A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- nozzle
- side walls
- nozzle body
- delivery
- casting
- Prior art date
Links
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
- B22D11/10—Supplying or treating molten metal
-
- 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
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
-
- 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
- B22D11/0642—Nozzles
-
- 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
- TECHNICAL FIELD This invention relates to the casting of metal strip. It has particular but not exclusive application to the casting of thin ferrous metal strip. It is known to cast thin metal strip by continuous casting in a twin roll caster. Molten metal is introduced between a pair of counter-rotated horizontal casting rolls which are internally cooled so that metal shells solidify on the moving roll surfaces and are brought together at the nip between them to produce a solidified thin strip product delivered downwardly from the nip between the rolls.
- the term "nip" is used herein to refer to the general region at which the rolls are closest together.
- the molten metal may be poured from a ladle into a smaller vessel from which the molten metal flows through a metal delivery nozzle located between the casting rolls above the nip to form a casting pool of molten metal supported on the casting surfaces of the casting rolls immediately above the nip.
- This casting pool may be confined between side plates or dams held in sliding engagement with the ends of the rolls .
- metal delivery nozzles aimed at producing a smooth even flow of metal to and within the casting pool .
- the thin cast strip that was produced by the twin roll caster was found to have ripple shaped contractions and associated cracking, due to uneven solidification, to appear in the cast strip.
- the present invention provides a metal delivery nozzle that is capable of inhibiting, if not completely alleviating this problem.
- a metal delivery nozzle for delivering molten metal into a casting pool of a strip caster comprising: (a) an elongate nozzle body having longitudinally extending side walls and end walls to form a nozzle trough; (b) side outlet openings in the side walls capable of providing for flow of molten metal from the trough laterally outwardly from the sides of the nozzle; and (c) the side walls of the nozzle below the side outlet openings extending downwardly to converge and meet at the lower extremity of the nozzle to form a bottom part of the nozzle body with an external surface configured to inhibit entrapment of gas bubbles under the nozzle trough in a casting pool.
- the side outlet openings may be spaced longitudinally along the side walls of the nozzle. Also, the side outlet openings may be capable of providing for outward flow of molten metal adjacent the bottom part of the trough .
- the bottom part may be an extension of the side walls , or a separate part .
- the bottom part may have a generally flat external surface angled downwardly and inwardly along the nozzle body.
- the bottom part may also have a generally flat external surface throughout and meet at an acute angle to form a distinct edge along the nozzle body.
- the bottom part may have convex curved external surfaces meeting at the bottom extremity of the nozzle body in an arcuate shape along the nozzle body.
- the upper parts of the side walls may extend downwardly to form the bottom part and have convex curved external surfaces along the nozzle body.
- the convex curved external surfaces of side walls forming the bottom part may meet at a bottom extremity in a rounded shape along the nozzle body.
- the convex curved external surfaces of the side walls forming the bottom part meet at an acute angle at a bottom extremity to form a distinct edge along the nozzle body.
- gas bubbles that appear in the casting pool are not trapped under the bottom of the metal delivery nozzle where they can coalesce into large bubble, which upon disturbance of equilibrium, can generate disturbances of the casting pool surface.
- gases generated in the casting pool by reaction between oxides in the molten metal slag and carbon in the molten metal and in the nozzle refractories used to construct the metal delivery nozzle. It is believed that immediate release of the gases to move smoothly up the external surfaces of the side walls forming the bottom part, and upwardly along the external surfaces of the upper side walls, disturbances in the casting pool surface are reduce, if not totally alleviated, and ripple defects and cracking in the cast strip are inhibited, if not completely eliminated.
- the longitudinal side walls and end walls of the nozzle body of the metal delivery nozzle may be formed of a carbon free refractory material . It is believed that such refractory materials undisruptive promotes release of any generated gas.
- coating of the external surfaces of the side walls of the nozzle with carbon free material for example an alkaline silicate material, alumina, zirconia or magnesia, is believed to further promote smooth release .
- the invention also extends to apparatus for continuous casting of thin metal strip comprising a pair of laterally positioned casting rolls forming a nip between them, and an elongate metal delivery nozzle disposed above and extending along the nip between the casting rolls.
- the metal delivery nozzle is capable of delivery of molten metal to form a casting pool of molten metal supported on the casting rolls above the nip.
- the delivery nozzle comprises an elongate nozzle body having longitudinally extending side walls and end walls disposed to form a nozzle trough, with side outlet openings in the side walls capable of providing flow of molten metal from the trough laterally outwardly from the side walls of the nozzle axially toward the circumstantial surfaces of the casting rolls .
- the side walls of the nozzle below the side outlet openings extend downwardly to converge and meet at the lower extremity of the nozzle to form a bottom part of the nozzle body with an external surface configured to inhibit entrapment of gas bubbles under the nozzle trough in a casting pool.
- a method of continuously casting thin metal strip comprising the steps of assembling a thin strip caster having a pair of casting rolls positioned to form a nip between them, assembling a metal delivery system capable of forming a casting pool between the casting rolls above the nip with side dams adjacent the ends of the nip to confine the casting pool, and assembling as part of the metal delivery system a delivery nozzle in one of the configurations described above .
- Figure 1 is a cross-sectional drawing showing a metal delivery nozzle of the prior art
- Figure 2 is a cross-sectional drawing showing a first embodiment of a metal delivery nozzle of the present invention
- Figure 3 is a cross-sectional drawing of a second embodiment of a metal delivery nozzle of the present invention
- Figure 4 is a cross-sectional drawing of a third embodiment of a metal delivery nozzle of the present invention
- Figure 5 is a cross-sectional drawing of a fourth embodiment of a metal delivery nozzle of the present invention.
- a metal delivery nozzle of the present invention is shown.
- An elongated nozzle body 11 is provided for receiving the molten metal 1 that is formed with a pair of longitudinal side walls 15, whose lower portions extend downwardly to approach and intersect each other at the lower extremity to form a bottom part 30 of the nozzle body.
- a pair of end walls 19 also joins the longitudinal side walls 15 to form the bottom part 30.
- the metal delivery nozzle is disposed above the roll gap G in the space enclosed by the side dams 7 and the casting rolls 6 of the twin roll caster.
- a plurality of side outlet openings 23 are provided through which molten metal is capable of being discharged from the nozzle body 11, and are directed towards the outer circumferential surfaces of the casting rolls 6.
- the casting pool 10 of molten metal is formed above the roll gap G in contact with the outer circumferential surfaces of the casting rolls 6.
- the downwardly extending side walls 15 of the nozzle body 11 form the bottom part 30 extending to the bottom extremity 32 of the delivery nozzle.
- the side walls 31 of the nozzle bottom part 30 are generally flat external surfaces throughout and meet at an acute angle to form a distinct edge at the bottom extremity 32 along the nozzle body.
- the casting rolls 6 counter-rotate and the casting pool 10 of molten metal is formed. With the passage of the cooling water through the casting rolls 6, heat is extracted through the casting rolls 6 from the molten metal 1 to solidify metal shells on the outer circumferential surfaces of the casting rolls 6, and cast thin strip 8 at the roll gap G between the casting rolls that is transported downwardly away from the roll gap G. Thin cast strip thus made has been found to have ripple-shaped shrinkage inhibited, if not completely eliminated in the surface of the cast strip 8.
- the elongated nozzle body 12 for receiving the molten metal 1 is formed with a pair of longitudinal side walls 16, and a pair of end walls 20 that join the longitudinal side walls 16.
- the lower portions of the side walls 16 approach each other and intersect at the lower extremity of the nozzle body.
- the metal delivery nozzle is so disposed above the roll gap G in the space enclosed by the side dams 7 and the casting rolls 6 of the twin roll caster.
- the lower portions of the longitudinal side walls 16 have a plurality of side outlet openings 24 capable of discharging molten metal from the nozzle body 12 towards the outer circumferential surfaces of the casting rolls 6.
- the downwardly extending side walls 16 form a nozzle bottom part 33 extending to the bottom extremity 35 of the nozzle.
- the external surfaces of upper parts of the side walls 34 are generally flat, and taper downwardly and inwardly in the same fashion as the side walls 31 in the nozzle body of Figure 2.
- the external surfaces of the bottom parts of side walls 33 are convex curved to meet at the bottom extremity of the nozzle in an arcuate bottom edge along the nozzle body.
- the casting rolls 6 counter-rotate and the casting pool 10 of molten metal is formed. With the passage of the cooling water through the casting rolls , heat is extracted from the molten metal 1 , and solidifies metal shells on the outer circumferential surfaces of the casting rolls 6 and forms thin cast strip 8 at the roll gap G that is transported downwardly away from the roll gap G.
- the thin cast strip 8 that is formed has ripple-shaped shrinkage in the surface inhibited, if not completely eliminated.
- Figure 4 shows a third metal delivery nozzle of the present invention, in which the nozzle body 13 for receiving the molten metal 1 is formed with a pair of longitudinal side walls 17, and a pair of end walls 21 that join the respective longitudinal side walls 17. Lower portions gradually approach each other and intersect at the lower extremity to form bottom part 36.
- the downwardly extending side walls 17 forming side walls 37 of a nozzle bottom part 36 extend to the bottom extremity 38 of the nozzle body.
- the external surfaces of the side walls 37 are convex curved, and meet at the bottom extremity of the nozzle body at a generally acute angle forming a distinct bottom edge along the nozzle body.
- the metal delivery nozzle is disposed above the roll gap G in the space enclosed by the side dams 7 and the casting rolls 6 of the twin roll caster.
- the lower portions of the longitudinal side walls 17 have a plurality of side outlet openings 25 capable of discharging molten metal from the nozzle body 13 towards the outer circumferential surfaces of the casting rolls 6.
- a casting pool 10 of molten metal is formed above the roll gap G on the outer circumferential surfaces of the casting rolls 6.
- the casting rolls 6 counter-rotate and the casting pool 10 of molten metal is formed. With the passage of the cooling water through the casting rolls , heat is extracted from the molten metal 1 to solidify metal shells on the outer circumferential surfaces of the casting rolls 6 and form thin cast strip 8 at the roll gap G that is transported downwardly away from roll gap G.
- the thin cast strip 8 that is formed has ripple-shaped shrinkage in the surface inhibited, if not completely eliminated. It is believed, based on our work, that, entrained carbon monoxide and other gases that are generated in the casting pool 10 of molten metal can rise generally in the form of small bubbles along the longitudinal side walls 17, without becoming trapped in the casting pool 10 of molten metal, because of shape of the external surfaces of lower parts of the longitudinal side walls 17 of the nozzle body forming the bottom part. Consequently, it is believed that the disturbance of the surface of the pool of molten metal 10 by the floating upwards of bubbles of large diameter is reduced, if not completely alleviated, and ripple-shaped shrinkage in the surface of the strip 8 is inhibited, if not completely eliminated.
- FIG. 5 shows a fourth delivery nozzle of the present invention.
- the nozzle body 14 for receiving the molten metal 1 is formed with a pair of longitudinal side walls 18 and a pair of end walls 22 that respectively join the longitudinal side walls 18.
- the lower portions of side walls 18 gradually approach each other and intersect at the lower extremity.
- the downwardly extended longitudinal walls 18 form side walls 47 of bottom part 46 of the nozzle body extending to the bottom extremity 48.
- the external surfaces of the side walls 47 are convex curved and meet to form the bottom part of the nozzle body in a rounded shape along the nozzle body.
- the molten metal supply nozzle is disposed above the roll gap G in the space enclosed by the side dams 7 and the casting rolls 6 of the twin roll caster.
- a plurality of side outlet openings 26 are capable of discharging molten metal from the nozzle body 14 towards the outer circumferential surfaces of the casting rolls 6.
- a casting pool 10 of molten metal is formed above the roll gap G in contact with the outer circumferential surfaces of the cooling rolls 6.
- the casting rolls 6 counter-rotate and the casting pool 10 of molten metal is formed.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05706236A EP1720675A4 (en) | 2004-02-17 | 2005-02-14 | A method and apparatus for continuously casting steel strip |
JP2006552424A JP2008529796A (en) | 2004-02-17 | 2005-02-14 | Steel strip continuous casting method and apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-39494 | 2004-02-17 | ||
JP2004039494A JP2005230826A (en) | 2004-02-17 | 2004-02-17 | Nozzle for supplying molten metal |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005077570A1 true WO2005077570A1 (en) | 2005-08-25 |
Family
ID=34857847
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2005/000186 WO2005077570A1 (en) | 2004-02-17 | 2005-02-14 | A method and apparatus for continuously casting steel strip |
Country Status (6)
Country | Link |
---|---|
US (1) | US20050211411A1 (en) |
EP (1) | EP1720675A4 (en) |
JP (2) | JP2005230826A (en) |
KR (1) | KR20070001190A (en) |
CN (1) | CN1960823A (en) |
WO (1) | WO2005077570A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7690417B2 (en) | 2001-09-14 | 2010-04-06 | Nucor Corporation | Thin cast strip with controlled manganese and low oxygen levels and method for making same |
US7926549B2 (en) | 2007-01-19 | 2011-04-19 | Nucor Corporation | Delivery nozzle with more uniform flow and method of continuous casting by use thereof |
US7926550B2 (en) | 2007-01-19 | 2011-04-19 | Nucor Corporation | Casting delivery nozzle with insert |
US8047264B2 (en) | 2009-03-13 | 2011-11-01 | Nucor Corporation | Casting delivery nozzle |
US8225845B2 (en) | 2009-12-04 | 2012-07-24 | Nucor Corporation | Casting delivery nozzle |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100441361C (en) * | 2006-09-01 | 2008-12-10 | 四川东风电机厂有限公司 | Method for controlling welding deformations of special type motor bedplate |
CN105458196B (en) * | 2015-12-07 | 2018-05-29 | 东北大学 | A kind of twin-roll thin strip continuous casting water nozzle |
US10478890B1 (en) | 2016-06-21 | 2019-11-19 | Nucor Corporation | Methods of billet casting |
CN107185993B (en) * | 2017-06-19 | 2019-05-21 | 长沙博朗思达金属材料有限公司 | A kind of injection rolling equipment and its application method in aluminum alloy sheets and strips preparation process |
CN111590038B (en) * | 2020-06-08 | 2022-05-20 | 一重集团大连工程技术有限公司 | Thin-strip continuous casting flow distributor capable of inhibiting liquid level fluctuation |
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JPS61195747A (en) | 1985-02-26 | 1986-08-30 | Ishikawajima Harima Heavy Ind Co Ltd | Twin roll type continuous casting machine |
JPH09103855A (en) | 1995-09-14 | 1997-04-22 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for metal strip casting, and fireproof nozzle to feed molten metal to casting reservoir of biroll casting machine |
EP0775543A1 (en) | 1995-11-23 | 1997-05-28 | Usinor Sacilor | Pouring nozzle for introducing liquid metal in a continuous casting mould for casting metallic products and continuous casting machine equipped with such a pouring nozzle |
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2004
- 2004-02-17 JP JP2004039494A patent/JP2005230826A/en active Pending
-
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- 2005-02-14 US US11/057,452 patent/US20050211411A1/en not_active Abandoned
- 2005-02-14 CN CNA2005800089885A patent/CN1960823A/en active Pending
- 2005-02-14 WO PCT/AU2005/000186 patent/WO2005077570A1/en active Application Filing
- 2005-02-14 JP JP2006552424A patent/JP2008529796A/en active Pending
- 2005-02-14 EP EP05706236A patent/EP1720675A4/en not_active Withdrawn
- 2005-02-14 KR KR1020067019108A patent/KR20070001190A/en not_active Application Discontinuation
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DATABASE WPI Week 200444, Derwent World Patents Index; Class M22, AN 2004-466029, XP003016359 * |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7690417B2 (en) | 2001-09-14 | 2010-04-06 | Nucor Corporation | Thin cast strip with controlled manganese and low oxygen levels and method for making same |
US7926549B2 (en) | 2007-01-19 | 2011-04-19 | Nucor Corporation | Delivery nozzle with more uniform flow and method of continuous casting by use thereof |
US7926550B2 (en) | 2007-01-19 | 2011-04-19 | Nucor Corporation | Casting delivery nozzle with insert |
US8047264B2 (en) | 2009-03-13 | 2011-11-01 | Nucor Corporation | Casting delivery nozzle |
US8225845B2 (en) | 2009-12-04 | 2012-07-24 | Nucor Corporation | Casting delivery nozzle |
US8646513B2 (en) | 2009-12-04 | 2014-02-11 | Nucor Corporation | Casting delivery nozzle |
Also Published As
Publication number | Publication date |
---|---|
CN1960823A (en) | 2007-05-09 |
JP2008529796A (en) | 2008-08-07 |
EP1720675A4 (en) | 2007-08-01 |
US20050211411A1 (en) | 2005-09-29 |
EP1720675A1 (en) | 2006-11-15 |
JP2005230826A (en) | 2005-09-02 |
KR20070001190A (en) | 2007-01-03 |
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