EP1018382A1 - Procede et dispositif de coulee continue - Google Patents

Procede et dispositif de coulee continue Download PDF

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Publication number
EP1018382A1
EP1018382A1 EP99922589A EP99922589A EP1018382A1 EP 1018382 A1 EP1018382 A1 EP 1018382A1 EP 99922589 A EP99922589 A EP 99922589A EP 99922589 A EP99922589 A EP 99922589A EP 1018382 A1 EP1018382 A1 EP 1018382A1
Authority
EP
European Patent Office
Prior art keywords
rolling
cast strip
rollers
mold
unsolidified
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Withdrawn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
EP99922589A
Other languages
German (de)
English (en)
Inventor
Munehito Mizuno
Masahiro Ikeda
Tetsuji Shiozaki
Moriki Hashio
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.)
Sumitomo Heavy Industries Ltd
Original Assignee
Sumitomo Heavy Industries Ltd
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=15644108&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1018382(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sumitomo Heavy Industries Ltd filed Critical Sumitomo Heavy Industries Ltd
Publication of EP1018382A1 publication Critical patent/EP1018382A1/fr
Withdrawn legal-status Critical Current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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands

Definitions

  • the present invention relates to a continuous casting method and a continuous casting device.
  • a thin cast strip produced by a continuous casting device is rolled thinner into a steel sheet by rolling mills in the downstream. If a cast strip is made thin enough in the casting process, the downstream rolling process can be made short, which reduces the cost of the rolling equipment.
  • the object of the present invention is to provide a continuous casting method and a continuous casting device for producing such thin cast strips.
  • a narrow aperture is made in the mold.
  • the molding aperture cannot be made as narrow as it is desired to be because of the thickness of the nozzle of melted steel.
  • a molding aperture of even width through its length, or depth, can be made as narrow as 90 mm. If the aperture is made narrower than 90 mm, stable casting cannot be made. Accordingly, some molds have an aperture which is wide at its inlet and narrows, towards its outlet, to 50 to 120 mm.
  • the reduction per roller has to be 10 mm or less, and the rolling-completion point has to be 1,900 mm or more below the surface of melted steel in the mold. Under such restrictions, it has, as a matter of fact, been impossible to complete the rolling of a cast strip before its solidified shell grows thick. Accordingly, a method of producing thin enough cast strips continuously has not been made available yet.
  • the object of the present invention is to provide a continuous casting method and a continuous casting device for producing cast strips which are thinner, and whose quality is higher, than those produced by the conventional unsolidified rolling method.
  • a continuous casting method of producing cast strips of thickness of 40 mm or less in a continuous casting device comprises (i) the step of rolling a cast strip, which is 50 to 120 mm in thickness at the outlet of a mold, in an unsolidified state that its solidified shell has grown to a certain thickness and melted steel is flowing in its central portion and (ii) the step of rolling the cast strip further in a semisolidified state that there is no flow of melted steel in its central portion but it has not completely solidified yet.
  • a continuous casting device which comprises (i) a non-rolling area 400 to 1,000 mm long which is disposed immediately below a mold, the mold having an aperture which is 50 to 120 mm wide at its outlet, (ii) a group of rollers for rolling a cast strip in an unsolidified state, the group of rollers being provided in the downstream of the non-rolling area, and (iii) a group of rollers for rolling the cast strip further in a semisolidified state that there is no flow of melted steel in its central portion but it has not completely solidified yet.
  • the numeral 1 indicates a mold; 2, support rollers in a non-rolling area 2A; 3, rolling rollers in an unsolidified rolling area 3A; and 4, rolling rollers in a semisolidified rolling area 4A.
  • the two faces of the aperture of the mold 1, corresponding to the two faces of a cast strip A, may be parallel with each other, or may be tilted to each other so as to make the outlet narrower than the inlet.
  • the outlet of the aperture is 50 to 120 mm wide.
  • the spacing between the two faces of the aperture is 50 to 120 mm at the outlet.
  • the non-rolling area 2A is directly under the mold 1 and have a length of 400 to 1,000 mm.
  • the cast strip A is guided by the support rollers 2 but not rolled in the non-rolling area 2A.
  • the melted steel poured into the mold 1 is cooled in it, and a solidified shell S is formed around the melted steel, or cast strip A. Then, its solidification is promoted by water spray, etc. in the non-rolling area 2A.
  • the rollers 3 roll the cast strip A in an unsolidified state.
  • melted steel is flowing in the central portion of the cast strip A and, therefore, the cast strip A can be rolled by small pressure. Because the required rolling pressure is small, rollers 3 of a small diameter can be disposed with small spacing between them and, hence, the cast strip A is less liable to develop bulging due to the static pressure in the melted steel.
  • rollers 3 are rolling the cast strip A to reduce its thickness in the unsolidified rolling area 3A, the cast strip A cools naturally, thickening its shell S.
  • the two face (as distinguished from “side") portions of the shell S of the cast strip A meet each other at a point 6 on the bottom of the unsolidified rolling area 3A, where the cast strip A completes its solidification.
  • the cast strip A has no melted steel flowing in its central portion but has not completely solidified yet.
  • the mean temperature of a section (the ?????? section) of the cast strip A is over 1,200o C, or the temperature of the center of the cast strip A is over 1,350o-1,400o C, and the mean temperature of its solidified shell S is 1,250o to 1,300o C. It has been found by the inventor(s) that a cast strip A in such a semisolidified state can be rolled with a pressure far smaller than the reaction which occurs in the cast strip A if it is rolled in a solidified state.
  • the mean temperature of the solidified shell of a cast strip in the solidified rolling area, where the cast strip is rolled in a solidified state, of the prior art II is about 1,100o C, and the deformation resistance is 4 kg/mm 2 .
  • the deformation resistance in the semisolidified rolling area 4A in accordance with the present invention is 1 kg/mm 2 or less because the mean temperature of the solidified shell in the area is 1,250o to 1,300o C.
  • the deformation resistance is reduced to a quarter.
  • rollers 4 of a diameter as small as that of the rollers 3 in the unsolidified rolling area 3A can be used in the semisolidified area 4A and, hence, the rollers 4 can be disposed with small spacing between them. Therefore, the freshly formed solidified shell does not bulge. Besides, the cast strip A does not develop cracks in it because it is rolled in a high temperature area where a rolling temperature (1,100oC or more) above the embrittlement temperature range can be secured.
  • rolling segments Used in the unsolidified and semisolidified rolling areas 3A and 4A are rolling segments each comprising small-diameter rollers which are disposed with small spacing between them.
  • the rolling segments are so configured that they can be raised and lowered, and tilted.
  • the thickness of the cast strip A after the rolling in the unsolidified and semisolidified rolling areas 3A and 4A can freely be set by changing the magnitudes of up-and-down movement and tilting movement of the rolling segments.
  • the solidification-completing point 6 moves up and down, which causes the length of the unsolidified rolling area 3A and the semisolidified rolling area 4A to change.
  • the deformation resistance in the cast strip A in the semisolidified rolling area 4A does not rise suddenly, a prescribed thickness of the cast strip A can be secured notwithstanding such fluctuations.
  • Fig. 1 Although the continuous casting device shown in Fig. 1 is a vertical type, it can also be a curved type with the same mechanism.
  • cast strips can be rolled thinner than those by the conventional unsolidified rolling method. Besides, cast strips of better quality can be produced continuously.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Metal Rolling (AREA)
EP99922589A 1998-06-05 1999-05-28 Procede et dispositif de coulee continue Withdrawn EP1018382A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP15718798 1998-06-05
JP15718798A JP3314036B2 (ja) 1998-06-05 1998-06-05 連続鋳造方法および連続鋳造装置
PCT/JP1999/002879 WO1999064189A1 (fr) 1998-06-05 1999-05-28 Procede et dispositif de coulee continue

Publications (1)

Publication Number Publication Date
EP1018382A1 true EP1018382A1 (fr) 2000-07-12

Family

ID=15644108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99922589A Withdrawn EP1018382A1 (fr) 1998-06-05 1999-05-28 Procede et dispositif de coulee continue

Country Status (3)

Country Link
EP (1) EP1018382A1 (fr)
JP (1) JP3314036B2 (fr)
WO (1) WO1999064189A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008046507A1 (fr) * 2006-10-13 2008-04-24 Sms Demag Ag dispositif de guidage de barre et procédé pour son utilisation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800006563A1 (it) * 2018-06-21 2019-12-21 Impianto e procedimento per la produzione di un nastro metallico laminato a caldo

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6082257A (ja) * 1983-10-07 1985-05-10 Kawasaki Steel Corp 連続鋳造における連続鍛圧法
JPH0215858A (ja) * 1988-07-02 1990-01-19 Sumitomo Metal Ind Ltd 薄鋳片の連続鋳造方法及びその装置
JPH03114643A (ja) * 1990-06-02 1991-05-15 Nippon Steel Corp 連続鋳造法
JPH0890166A (ja) * 1994-09-21 1996-04-09 Sumitomo Metal Ind Ltd 連続鋳造装置及びその連続鋳造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9964189A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008046507A1 (fr) * 2006-10-13 2008-04-24 Sms Demag Ag dispositif de guidage de barre et procédé pour son utilisation
US8162033B2 (en) 2006-10-13 2012-04-24 Sms Demag Aktiengesellschaft Strand guiding device and method of operating it

Also Published As

Publication number Publication date
WO1999064189A1 (fr) 1999-12-16
JP3314036B2 (ja) 2002-08-12
JPH11347700A (ja) 1999-12-21

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