EP0946316B1 - Improved unit of equipments for the high-speed continuous casting of good quality thin steel slabs - Google Patents

Improved unit of equipments for the high-speed continuous casting of good quality thin steel slabs Download PDF

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Publication number
EP0946316B1
EP0946316B1 EP97946036A EP97946036A EP0946316B1 EP 0946316 B1 EP0946316 B1 EP 0946316B1 EP 97946036 A EP97946036 A EP 97946036A EP 97946036 A EP97946036 A EP 97946036A EP 0946316 B1 EP0946316 B1 EP 0946316B1
Authority
EP
European Patent Office
Prior art keywords
mould
submerged nozzle
unit according
area
casting
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
EP97946036A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0946316A1 (en
Inventor
Giovanni Arvedi
Luciano Manini
Andrea Bianchi
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Individual
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Individual
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Publication date
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Publication of EP0946316A1 publication Critical patent/EP0946316A1/en
Application granted granted Critical
Publication of EP0946316B1 publication Critical patent/EP0946316B1/en
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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
    • B22D11/14—Plants for continuous casting
    • B22D11/142—Plants for continuous casting for curved casting
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0408—Moulds for casting thin slabs
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/053—Means for oscillating the moulds
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/055—Cooling the moulds

Definitions

  • the present invention relates to an improved unit of equipments for highspeed continuous casting of good quality thin steel slabs.
  • the improved unit of casting elements according to the present invention generally has the characteristics of claim 1, as well as, according to specific aspects of the invention, additional characteristics described in the dependent claims.
  • Figure 1 is a diagrammatic view of the casting unit according to the invention, with a mould 1, a dip casting nozzle 2, hereinafter always referred to as “submerged nozzle” and an oscillator 3, which is hydraulically driven and, according to this embodiment, is fastened to the mould body, obviously so as not to interfere with the casting line.
  • Figure 1 also shows the section of passage of the liquid steel flow between submerged nozzle 2 and the shell getting formed along the copper walls, i.e. the two "channels" 4 thus formed.
  • the area of thin slab cast in the time unit is thus: 2•(T2+W2)•V2, equal to about 2•W2•V2 if the thickness of the thin slab is considered as negligible with respect to its width.
  • the thin mould is capable of containing a reliable, i.e. sufficiently thick, submerged nozzle, with its large copper plates having such a profile in the horizontal plane, around the meniscus level, to exactly match the profile of the submerged nozzle in the said horizontal plane, thereby keeping in every point of the middle region a constant distance between the submerged nozzle and the walls.
  • a reliable, i.e. sufficiently thick, submerged nozzle with its large copper plates having such a profile in the horizontal plane, around the meniscus level, to exactly match the profile of the submerged nozzle in the said horizontal plane, thereby keeping in every point of the middle region a constant distance between the submerged nozzle and the walls.
  • such a distance is chosen so that the ratio A1/S1, i.e.
  • Such a ratio once e.g. the dimensions of the submerged nozzle and the thickness of the smaller sides have been fixed, may be used for defining the trend of the mould profile in the horizontal plan at the meniscus level, or, the dimensions of the mould profile being known, may be used for determining the profile trend of the submerged nozzle, likewise in order to ensure a well-balanced amount of lubricating slags along the entire mould profile.
  • This geometrical configuration is important also for the flow of molten steel in the meniscus region, since the "channels", indicated with numeral 4 in Figure 1, which are generated between the submerged nozzle and the shell getting formed against the copper walls, will be sufficiently large to prevent the vortex formation due to the acceleration of the streams converging in the middle from the mould smaller sides, in the meniscus region, which vortexes often cause the powders to be trapped, resulting in the aforementioned drawbacks.
  • the mould used in the casting unit according to the invention is one with a variable bending in longitudinal direction which allows to have a nearly infinite bending radius in the upper region for a better arrangement of the submerged nozzle, while providing the bending of the slab already getting formed inside the mould with an exit on the arc-shaped casting guide other than the vertical, so as to advantageously reduce the height of the casting unit and accordingly the ferrostatic forces and the risk of slab swellings.
  • the bending is graded in a progressive and uniform way from the infinite radius of the mould inlet to the bending radius R o corresponding to the casting guide ( Figure 1), thereby preventing both exceeding stresses on the solidified external shell of the slab and the possibility of an imperfect contact with the copper walls of the mould.
  • the unit for cooling the mould plates is especially important, having to be capable of withstanding the high heat fluxes typical for thin slabs (up to 3 MW/m 2 , average value on the entire cooling surface of the mould), with a cooling being enhanced in the meniscus region in order to prevent copper cracks and nevertheless being sufficiently uniform around the mould to prevent thermal stresses for the slab getting formed.
  • This heat flux is also a function of the local surface temperature on the hot surface of the copper plates, in turn dependent also upon the distance from the pipes wherein the cooling water flows.
  • the submerged nozzle As for the submerged nozzle, besides the aforementioned dimensional conditions with respect to the mould, it has to be designed so as to allow the optimal behavior of the molten steel flow, while taking into account also the gradual shell formation, as well as the life of the submerged nozzle itself.
  • the problems increase concerning the motions of the liquid inside the mould, possibly resulting in the formation of stationary waves in the meniscus region and thus a local reduction of the thickness of the liquid slag, which adversely affects the lubrication and the insulation of the shell of the slab getting solidified.
  • a preferred submerged nozzle for thin slabs has geometrical characteristics resulting in castings having a low energy in outlet and a high probability of dissipation inside the liquid volume of the slab, improved flow guiding by virtue of the side shape of the submerged portion (thereby preventing the vortex formation and the powder trapping), besides an improved level control in the mould. Furthermore the feed is steady, the flow is substantially split in two streams and the starting surfaces inside the submerged nozzle are preserved, since the oxide deposit is negligible; moreover those good flow conditions result in a reduced extent of external mechanical erosion in the meniscus region.
  • the optimized design of the mould-submerged nozzle unit besides the aforementioned conditions, is such that the ratio between the height of stationary wave (from peak to peak in mm) and the casting speed in m/min never exceeds 5, with an average value of 3.3.
  • stdDEV(ML) 0.7-1.5 mm
  • the third element of the unit i.e. oscillator 3
  • it may be formed of a framework 3a being hinged to the floor and driven by a hydraulic servocontrol 5.
  • Framework 3a is also hinged to a mould support 3b, thus forming a kind of quadrilateral together with a set of springs fitted into both ends.
  • the control flexibility is ensured by a program logic control allowing to change the oscillation parameters concerning the wave shape, the wave amplitude between ⁇ 2 and ⁇ 10 mm, as well as the oscillation program.
  • the control continuously records the actual value of the casting speed so as to control the oscillation frequency based on the previous parameters.
  • Maximum oscillation frequencies have been obtained as high as 480-520 strokes/min, for the first natural frequency of the entire dynamic system of 16.7 Hz.
  • the flexibility is such that the oscillation parameters may be adjusted so as to obtain, for every quality of steel, an optimal lubrication and a surface quality as a function of the casting speed.
  • the oscillator may be of the so-called "resonance" type, the mould being directly mounted upon flexure springs, without no lever system, and oscillated by a hydraulic servocontrol at a frequency close to the natural frequency of the elastic system, with no clearance and thus along an extremely precise path.
  • the mould itself may have in the vertical plane a profile other than the one disclosed in European patent 0705152 and the submerged nozzle may be different than the one disclosed and claimed in application PCT/IT-97/00135, provided that the aforementioned geometrical relations are complied with.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP97946036A 1996-11-12 1997-11-12 Improved unit of equipments for the high-speed continuous casting of good quality thin steel slabs Expired - Lifetime EP0946316B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT96MI002336A IT1287156B1 (it) 1996-11-12 1996-11-12 Insieme perfezionato di apparecchiature per la colata continua a velocita' elevata di bramme d'acciaio sottili di buona qualita'
ITMI962336 1996-11-12
PCT/IT1997/000276 WO1998020997A1 (en) 1996-11-12 1997-11-12 Improved unit of equipments for the high-speed continuous casting of good quality thin steel slabs

Publications (2)

Publication Number Publication Date
EP0946316A1 EP0946316A1 (en) 1999-10-06
EP0946316B1 true EP0946316B1 (en) 2002-01-02

Family

ID=11375188

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97946036A Expired - Lifetime EP0946316B1 (en) 1996-11-12 1997-11-12 Improved unit of equipments for the high-speed continuous casting of good quality thin steel slabs

Country Status (14)

Country Link
EP (1) EP0946316B1 (pt)
JP (1) JP3974186B2 (pt)
KR (1) KR100539994B1 (pt)
CN (1) CN1072535C (pt)
AT (1) ATE211416T1 (pt)
AU (1) AU718124B2 (pt)
BR (1) BR9713007A (pt)
CA (1) CA2269130C (pt)
DE (1) DE69709899T2 (pt)
ES (1) ES2169436T3 (pt)
IT (1) IT1287156B1 (pt)
RU (1) RU2195384C2 (pt)
WO (1) WO1998020997A1 (pt)
ZA (1) ZA979675B (pt)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7967056B2 (en) 2005-07-19 2011-06-28 Giovanni Arvedi Process and related plant for manufacturing steel long products without interruption
US8162032B2 (en) 2005-07-19 2012-04-24 Giovanni Arvedi Process and plant for manufacturing steel plates without interruption

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19817701C2 (de) * 1998-04-21 2000-09-28 Sms Demag Ag Hubtisch mit Oszillationsantrieb für eine Stranggießeinrichtung
CN1972764B (zh) 2005-04-07 2011-12-07 乔瓦尼·阿尔韦迪 连续铸造与轧制间非连续金属带材及板材制造工艺与设备
CN102112255B (zh) * 2008-08-06 2014-05-07 Sms西马格股份公司 用于液态金属、特别用于液态钢的连续铸造金属铸型
JP5272720B2 (ja) * 2008-12-25 2013-08-28 新日鐵住金株式会社 鋼の連続鋳造方法
ITMI20112292A1 (it) 2011-12-16 2013-06-17 Arvedi Steel Engineering S P A Dispositivo di supporto ed oscillazione per lingottiera in impianti di colata continua
IT202000016120A1 (it) 2020-07-03 2022-01-03 Arvedi Steel Eng S P A Impianto e procedimento per la produzione in continuo di nastri d’acciaio ultrasottili laminati a caldo

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1049698A (en) * 1964-05-05 1966-11-30 British Iron Steel Research Improvements in or relating to the manufacture of elongate articles
DE1558376A1 (de) * 1967-04-15 1970-03-19 Vnii Pk I Metall Maschino Kokille
FR2055784A1 (en) * 1969-08-18 1971-04-30 Ural Z Tyaznlloco Mould rocking mechanism in continuous metal - casting plants
JPS60247451A (ja) * 1984-05-22 1985-12-07 Kawasaki Steel Corp 連続鋳造鋳型内湯面追従方法と装置
JPH0763825B2 (ja) * 1985-08-20 1995-07-12 住友重機械工業株式会社 連続鋳造装置のオシレ−シヨン装置
DE4142447C3 (de) * 1991-06-21 1999-09-09 Mannesmann Ag Tauchgießrohr - Dünnbramme
DE4341719C2 (de) * 1993-12-03 2001-02-01 Mannesmann Ag Einrichtung zum Stranggießen von Stahl
DE4436990C1 (de) * 1994-10-07 1995-12-07 Mannesmann Ag Tauchgießrohr

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7967056B2 (en) 2005-07-19 2011-06-28 Giovanni Arvedi Process and related plant for manufacturing steel long products without interruption
US8162032B2 (en) 2005-07-19 2012-04-24 Giovanni Arvedi Process and plant for manufacturing steel plates without interruption

Also Published As

Publication number Publication date
ITMI962336A0 (it) 1996-11-12
WO1998020997A1 (en) 1998-05-22
CN1072535C (zh) 2001-10-10
RU2195384C2 (ru) 2002-12-27
JP3974186B2 (ja) 2007-09-12
AU718124B2 (en) 2000-04-06
ES2169436T3 (es) 2002-07-01
IT1287156B1 (it) 1998-08-04
ZA979675B (en) 1998-05-21
CA2269130C (en) 2006-10-10
CA2269130A1 (en) 1998-05-22
KR20000053199A (ko) 2000-08-25
DE69709899D1 (de) 2002-02-28
EP0946316A1 (en) 1999-10-06
BR9713007A (pt) 2000-01-25
CN1237120A (zh) 1999-12-01
JP2001504037A (ja) 2001-03-27
ATE211416T1 (de) 2002-01-15
DE69709899T2 (de) 2002-06-27
KR100539994B1 (ko) 2006-01-10
ITMI962336A1 (it) 1998-05-12
AU5133898A (en) 1998-06-03

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