EP0009803A1 - Procédé de coulée continue d'acier - Google Patents

Procédé de coulée continue d'acier Download PDF

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Publication number
EP0009803A1
EP0009803A1 EP79103749A EP79103749A EP0009803A1 EP 0009803 A1 EP0009803 A1 EP 0009803A1 EP 79103749 A EP79103749 A EP 79103749A EP 79103749 A EP79103749 A EP 79103749A EP 0009803 A1 EP0009803 A1 EP 0009803A1
Authority
EP
European Patent Office
Prior art keywords
generated
traveling
strand
fields
turbulent flow
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.)
Granted
Application number
EP79103749A
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German (de)
English (en)
Other versions
EP0009803B1 (fr
Inventor
Jan Lipton
Armin Thalmann
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 Holding AG
Concast AG
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4362637&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0009803(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Concast Holding AG, Concast AG filed Critical Concast Holding AG
Priority to AT79103749T priority Critical patent/ATE2775T1/de
Publication of EP0009803A1 publication Critical patent/EP0009803A1/fr
Application granted granted Critical
Publication of EP0009803B1 publication Critical patent/EP0009803B1/fr
Expired legal-status Critical Current

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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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/122—Accessories for subsequent treating or working cast stock in situ using magnetic fields

Definitions

  • the present invention relates to a process for the continuous casting of steel, in which melt is poured into a mold, the resulting strand having a liquid core is drawn out, guided in a guideway and supported, and a turbulent flow in the liquid core is generated by at least two electromagnetic traveling fields.
  • the structure of a slab produced by the continuous casting process depends on the composition of the material and the casting temperature. At casting temperatures of only a few degrees Celsius above the melting temperature outweighs a globular, non-directional and at casting temperatures of 15 0 C and more above the melting temperature, a columnar, directional structure with a strong central positive segregation of tramp elements. Because of the good processing properties, especially when rolling, slabs with a globular structure are preferred. For reasons of casting technology, for example because of the difficulty of setting a uniform temperature to within a few degrees for a large batch during the entire casting time and to prevent the melt from partially solidifying in the pan, in practice, temperatures above liquidus (in the following also called excess temperatures) of more than 20 C. It For this reason, many efforts have already been made to obtain a slab with a predominantly globular, undirected structure and without central segregation, even when casting at excess temperature.
  • shear forces are generated in the direction of the longitudinal axis of the strand with an electromagnetic traveling field, the magnets running around the strand being arranged between the pairs of rollers from the mold to the bottom end.
  • the flow created along the swamp brings the desired area of non-columnar structure and prevents the formation of decisive ones S eigerept, in particular the center segregation and white bands. Due to the large number of magnets, such a system takes up too much space, prevents the strand from being supported and cooled, which reduces the performance of the system. Furthermore, this system is far too complex.
  • the cast material should be low-segregation, especially with regard to the central segregation and white bands. Furthermore, the space required to generate the magnetic stirring effect should be small.
  • This object is achieved according to the invention by the turbulent flow caused by shear forces caused by traveling fields and acting on the liquid steel different sizes and by mutual influence of the currents caused by the different thrust forces.
  • the turbulent flow generated by the traveling fields and acting on the liquid steel in the core of different sizes and the resulting, mutually influencing flows produce such a turbulent flow that practically no negative segregations, i.e. no white bands, visible in the micrograph.
  • the desired zone of a non-columnar, dense structure is obtained, in particular the center porosity can be prevented, so that improved rolled products can be produced.
  • the space required for the creation of the hiking fields is small in relation to the effective area.
  • the turbulent flow is advantageously generated by moving fields acting from one strand side.
  • Another form of advantageous application is that the turbulent flow is generated by rectified shear forces caused by traveling fields and acting on the liquid steel.
  • the traveling fields can be excited with different current strengths according to a feature of the invention.
  • the resulting transverse force to the shear force acting on the molten steel results in a more effective turbulent flow that creates the desired cast structure.
  • the magnet of one traveling field is advantageously subjected to a current which is 10% to 2500 higher than the magnet of the other traveling field.
  • the different shear forces are advantageously generated transversely to the strand longitudinal sleeve.
  • the turbulent flow hits the solidified side wall of the strand, vortices are released, which mostly move in the direction of the mold -
  • the melt is not only in the plane of the strand cross section with the turbulent flow, but over a large area in the Recirculated in the longitudinal direction of the strand, which enables an advantageous exchange of the melt from the direct area of influence of the magzete with steel freshly flowing in from the mold and thus a temperature compensation in the entire melt.
  • the liquid steel is stirred in this large area.
  • the mixing of cold steel with the hot steel flowing in underneath the magnets can be improved by producing a weaker thrust in the traveling field facing away from the mold than in the traveling field facing the mold.
  • this exchange of cold and hot steel can be obtained in an even larger area by generating the different thrust forces against the direction of the strand, but this requires a somewhat larger space for the magnets.
  • another feature of the invention is that the turbulent flow is generated by differently acting thrust forces within at least one of the traveling fields.
  • the winding of one phase of the magnet generating different shear forces is advantageously acted on by different currents compared to the winding of at least one other phase.
  • the invention additionally recommends that the differently acting thrust forces within a moving field are alternately generated between the moving fields.
  • Fig. 1 denotes a cooled, curved and oscillating mold for casting a slab, which is supplied with liquid steel from a casting vessel, not shown, via a pouring pipe reaching into the mold 1.
  • the strand 2 formed in the mold 1 and having a liquid core 3 is guided and supported in a curved strand path 4 following the mold 1 with a radius of 10 m with the aid of rollers 5.
  • Spray nozzles 6 are arranged between the rollers 5 for further cooling of the strand 2.
  • the strand is pulled out and straightened by a driving judge 7.
  • a housing 10 with a group of two traveling field magnets 11, 12 of known construction is arranged on the inside of the continuous sheet.
  • the arrangement on another side of the string is also possible.
  • the traveling fields 11, 12 generate different shear forces acting in the same direction, transversely to the strand, on the liquid steel in the core 3.
  • the distance must be smaller than the size of the two adjacent flow cells generated by the magnets.
  • the windings of the magnet 11 facing the mold 1 are supplied with a current of 1000 A and the windings of the magnet 12 facing away from the mold 1 with a current of 850 A.
  • the frequency for both magnets is 2 Hz.
  • the frequencies can also be different, however. for example 2 Hz and 1.5 Hz, which also affects the turbulence.
  • the rectified thrust forces of different sizes generated by the two traveling fields acting transversely to the longitudinal axis of the strand cause different flow velocities, as a result of which an effective turbulence is generated in the mutual influence area of the two flows.
  • additional vortices are created. Due to the higher velocity of the flow generated by the mold facing the mold compared to the mold moving away from the mold, an ascent of the liquid steel along the side wall in the direction of the mold is favored.
  • the following procedure can be used to adapt the turbulence to the different casting parameters from plant to plant, but also to the changing casting parameters within a plant.
  • the two turns of the magnet 11 are subjected to 1000 A, so that the same shear forces act on the molten steel within its traveling field.
  • the magnet 12 is flat in this example if constructed in two phases.
  • both magnets can also have more than two phases.
  • the windings of the first phase are fed with 900 A and those of the second phase with 800 A, whereby different shear forces are generated within the traveling field of the magnet 12.
  • the previously mentioned transverse forces will result in other turbulences compared to the turbulences which are present with the same thrust within the two traveling fields.
  • both magnets 11 and 12 can also generate differently acting thrust forces within the corresponding traveling field.
  • the adaptation to the changing casting parameters can be made even easier by alternately applying magnet 12 with 1000 A and the two phases of magnet 11 with 900 A and 800 A. This change can take place every 10 seconds, for example.
  • Fig. 2 the mold is again designated 1 and the strand with 2.
  • the rollers 5 lead the strand.
  • two traveling field magnets 21 and 22 are arranged in the longitudinal direction of the strand.
  • the magnets will act on the liquid steel from another side of the strand and cause the currents to influence one another.
  • Different currents are applied to the windings of the two magnets in order to generate different shear forces against the direction of the strand. This creates turbulent flows, as indicated by arrows 23 and 24. This transports the cold steel located below the magnets towards the mold, where it flows into the mold hot steel mixed.
  • the method was used with two traveling field magnets arranged side by side as a group.
  • the magnetic traveling fields used to generate a turbulent flow do not necessarily have to be oriented transversely or parallel to the longitudinal direction of the strand, but can just as well include any angle with this direction.
  • the traveling fields do not have to be generated by electromagnets that are connected to a single assembly. It can even be advantageous to arrange modules independently of one another and to be movable. Such an arrangement enables the magnets to be displaced relative to one another both in the longitudinal and in the transverse direction of the strand and pivoted independently of one another.
  • Another way of generating differently acting thrust forces is to use two traveling field magnets of different construction. With strands with long, liquid cores, several groups of moving fields can be effective in the longitudinal direction of the strand.
  • the method according to the invention can be used for all types of continuous casting plants with continuous molds.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP79103749A 1978-10-06 1979-10-02 Procédé de coulée continue d'acier Expired EP0009803B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79103749T ATE2775T1 (de) 1978-10-06 1979-10-02 Verfahren zum stranggiessen von stahl.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH10383/78 1978-10-06
CH1038378A CH632431A5 (de) 1978-10-06 1978-10-06 Verfahren zum stranggiessen von stahl.

Publications (2)

Publication Number Publication Date
EP0009803A1 true EP0009803A1 (fr) 1980-04-16
EP0009803B1 EP0009803B1 (fr) 1983-03-16

Family

ID=4362637

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79103749A Expired EP0009803B1 (fr) 1978-10-06 1979-10-02 Procédé de coulée continue d'acier

Country Status (7)

Country Link
EP (1) EP0009803B1 (fr)
JP (1) JPS5554246A (fr)
AT (1) ATE2775T1 (fr)
CA (1) CA1148722A (fr)
CH (1) CH632431A5 (fr)
DE (1) DE2965037D1 (fr)
ZA (1) ZA795254B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0036611A1 (fr) * 1980-03-20 1981-09-30 Concast Holding Ag Procédé et dispositif pour soutenir une barre d'acier fabriquée par un procédé de coulée continue
EP0045938A1 (fr) * 1980-08-11 1982-02-17 Concast Holding Ag Procédé et dispositif de brassage d'une barre ayant une coupe transversale rectangulaire dans une installation de coulée continue
EP0028761B1 (fr) * 1979-11-06 1985-02-20 Asea Ab Procédé de brassage lors de la coulée continue
EP0145699A1 (fr) * 1983-11-04 1985-06-19 VOEST-ALPINE INDUSTRIEANLAGENBAU GESELLSCHAFT m.b.H. Dispositif de brassage dans une installation de coulée continue
EP0178695A1 (fr) * 1984-09-17 1986-04-23 DANIELI & C. OFFICINE MECCANICHE S.p.A. Ligne de coulée continue comportant des agigateurs multifonctionnels et système de refroidissement amèlioré

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014105870A1 (de) 2014-04-25 2015-10-29 Thyssenkrupp Ag Verfahren und Vorrichtung zum Dünnbrammen-Stranggießen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1305414A (fr) * 1969-12-12 1973-01-31
GB1405312A (en) * 1972-06-08 1975-09-10 Siderurgie Fse Inst Rech Machines for the continuous casting of metals
GB1454052A (en) * 1973-04-18 1976-10-27 Nippon Steel Corp Continuous casting method and apparatus therefor
US4016926A (en) * 1974-03-23 1977-04-12 Sumitomo Electric Industries, Ltd. Electro-magnetic strirrer for continuous casting machine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU76942A1 (fr) * 1977-03-14 1978-10-18

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1305414A (fr) * 1969-12-12 1973-01-31
GB1405312A (en) * 1972-06-08 1975-09-10 Siderurgie Fse Inst Rech Machines for the continuous casting of metals
GB1454052A (en) * 1973-04-18 1976-10-27 Nippon Steel Corp Continuous casting method and apparatus therefor
US4016926A (en) * 1974-03-23 1977-04-12 Sumitomo Electric Industries, Ltd. Electro-magnetic strirrer for continuous casting machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0028761B1 (fr) * 1979-11-06 1985-02-20 Asea Ab Procédé de brassage lors de la coulée continue
EP0036611A1 (fr) * 1980-03-20 1981-09-30 Concast Holding Ag Procédé et dispositif pour soutenir une barre d'acier fabriquée par un procédé de coulée continue
EP0045938A1 (fr) * 1980-08-11 1982-02-17 Concast Holding Ag Procédé et dispositif de brassage d'une barre ayant une coupe transversale rectangulaire dans une installation de coulée continue
EP0145699A1 (fr) * 1983-11-04 1985-06-19 VOEST-ALPINE INDUSTRIEANLAGENBAU GESELLSCHAFT m.b.H. Dispositif de brassage dans une installation de coulée continue
EP0178695A1 (fr) * 1984-09-17 1986-04-23 DANIELI & C. OFFICINE MECCANICHE S.p.A. Ligne de coulée continue comportant des agigateurs multifonctionnels et système de refroidissement amèlioré

Also Published As

Publication number Publication date
EP0009803B1 (fr) 1983-03-16
DE2965037D1 (en) 1983-04-21
JPS5554246A (en) 1980-04-21
ATE2775T1 (de) 1983-04-15
ZA795254B (en) 1980-09-24
CH632431A5 (de) 1982-10-15
CA1148722A (fr) 1983-06-28

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