EP2292350A1 - Moule pour le moulage en continu de produits longs ou plats, gaine de refroidissement conçue pour coopérer avec un tel moule et ensemble comprenant un tel moule et une telle gaine de refroidissement - Google Patents

Moule pour le moulage en continu de produits longs ou plats, gaine de refroidissement conçue pour coopérer avec un tel moule et ensemble comprenant un tel moule et une telle gaine de refroidissement Download PDF

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Publication number
EP2292350A1
EP2292350A1 EP09425320A EP09425320A EP2292350A1 EP 2292350 A1 EP2292350 A1 EP 2292350A1 EP 09425320 A EP09425320 A EP 09425320A EP 09425320 A EP09425320 A EP 09425320A EP 2292350 A1 EP2292350 A1 EP 2292350A1
Authority
EP
European Patent Office
Prior art keywords
mould
thickness
cooling jacket
longitudinal
transversal
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Withdrawn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
EP09425320A
Other languages
German (de)
English (en)
Inventor
Ugo Zanelli
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.)
Primetals Technologies Italy SRL
Original Assignee
Siemens VAI Metals Technologies SRL
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 Siemens VAI Metals Technologies SRL filed Critical Siemens VAI Metals Technologies SRL
Priority to EP09425320A priority Critical patent/EP2292350A1/fr
Priority to PCT/EP2010/060916 priority patent/WO2011023483A1/fr
Priority to RU2012108072/02A priority patent/RU2012108072A/ru
Priority to CN2010800345153A priority patent/CN102470425A/zh
Priority to EP10745581A priority patent/EP2461924A1/fr
Publication of EP2292350A1 publication Critical patent/EP2292350A1/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Withdrawn legal-status Critical Current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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0406—Moulds with special profile
    • 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
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/06—Ingot moulds or their manufacture

Definitions

  • the invention relates to a mould for the continuous casting of long or flat products such as billets or blooms.
  • Moulds for the continuous casting of long products define a continuous sizing passage for the cast metal which enters it in the molten state via the top of the mould and leaves it via the bottom of the mould in the form of a solid shell deriving from the peripheral solidification of the cast metal on contact with the cold wall of the mould body and which contains a still-liquid core. Solidification then continues to its conclusion in the lower part of the casting machine by means of spray units.
  • These kinds of moulds are also called “mould tube” and can have a square, rectangular, circular, or polygonal cross-section.
  • the tubes can be straight or curved along a so called “casting radius", and the internal cavity is characterized by a progressive decrease in dimension in order to follow the natural shrinkage of steel during solidification process.
  • Moulds for continuous casting of long products must withstand high temperatures load during casting.
  • the top part of the mould is subject to a heat transfer profile which could be characterized by isotherm at different temperatures.
  • Such conditions which are also enhanced by higher casting speed and oil lubrication, induce high thermal gradients in longitudinal and also in transversal direction of the mould, with additional high gradients, and therefore high internal temperature, across the thickness of mould.
  • Such temperature differences between different points of the mould, and the high temperature reached inside the mould induce thermal distortion, recrystalization, cracking and detachment of internal chromium plating.
  • the decrease of mould thickness improves the temperature gradient between internal and external side of the mould, on the other hand, this decrease reduces mechanical characteristics of the mould.
  • the object of the invention is to solve the above mentioned problems and more specifically to increase heat transfer, decrease temperature gradients in longitudinal and transversal directions of a mould, as well as decrease the internal temperature of a mould for continuous casting of long products and at the same time keeping the mechanical characteristics of said mould when used.
  • the subject of the invention is a mould for continuous casting of long or flat products extending along an axis and comprising an internal and an external surface delimiting mould thicknesses, the internal surface defining a mould cavity, characterized in that the thickness of at least one part of the mould varies depending on measured or simulated temperature gradients of a mould in use.
  • the invention increases heat transfers, decreases temperature gradients in longitudinal and transversal direction, and decreases the internal temperature of the mould, creating the preconditions for a more homogeneous shell growth.
  • the mould has a plurality of longitudinal elements extending along the axis, said elements forming a transverse polygonal cross-section of the mould, a thickness of at least one mould element contained in a mould transversal cross-section continuously varies between a first and a second value depending on measured or simulated transversal temperature gradients of a mould in use.
  • the thickness varies continuously from the middle of a segment of said mould element in the direction of one of the internal corners of the mould.
  • each mould element varies from the middle of a segment of each mould element in the direction of an internal corner of the mould.
  • At least one portion of a the mould element is symmetrical with respect to a plan passing by the central segment of said transversal mould element and being perpendicular to said transversal mould element.
  • the variation of the thickness extends only on a portion of the height of the mould.
  • the variation is an increase.
  • the maximal thicknesses are equal.
  • a thickness of at least a longitudinal element of the mould contained in a longitudinal cross-section of the mould varies depending on measured or simulated temperature gradients of a mould in use.
  • the variation is function of longitudinal temperature gradients measured or simulated on a mould in use.
  • the thickness contained in a longitudinal cross-section of each longitudinal element increases, at least on a portion of the mould, from a point of minimum thickness in both directions defined by the longitudinal axis.
  • the point of minimum thickness is located depending on the location of the point of maximum longitudinal temperature previously measured on said other mould in use or previously determined by simulation.
  • the subject of the invention is a cooling jacket designed to cooperate with a mould as above defined, the cooling jacket comprising a body defining a plurality of cooling ducts for guiding a cooling agent along external surfaces of the mould, the cooling jacket being designed to receive and at least partially longitudinally surround said mould, a thickness of the cooling jacket varies depending on measured or simulated temperatures gradients of a mould in use.
  • the thickness of the cooling jacket at a predefined height of the cooling jacket is inversely proportional to the thickness of the mould at the same height.
  • the subject of the invention is an assembly comprising a mould as above defined and a cooling jacket as above defined.
  • Figure 1 is a graphic giving the isotherms measured or simulated along the longitudinal direction and the longitudinal thickness of a mould for continuous casting of long products in use, the liquid metal entering the mould being at a temperature comprises between approximately 1450°C and 1600°C, depending on the chemical composition of the cast product and on the casting mode, section and speed.
  • the mould represented in the figures is 900mm long, has a thickness of 13mm and has a squared cross section.
  • Figure 2 is a view of internal and external temperatures profiles of a mould in use according to figure 1 conditions.
  • figure 2 gives temperatures, measured or simulated, along the internal and the external faces of a mould in use in figure 1 conditions.
  • the temperatures T°out are the temperatures of the external face of the mould and the temperatures T°in are the temperatures of the internal face of the mould.
  • These two curves give the difference of temperature across the thickness of the mould for a given altitude of the known mould. For example, the difference of temperature between an internal and an external point of the known mould situated at 200mm from the top of the known mould is about 100°C. As above mentioned, this difference causes cracking of the mould and other problems.
  • the aims of the invention are to minimize the differences of temperature between two points of the mould. In other words, to have more uniform temperature distribution of the mould and at the same time increase heat extraction and decrease internal mould wall temperature.
  • an object of the invention is a mould for continuous casting of long products comprising an internal and an external surface delimiting a thickness of the mould, the internal surfaces defining a mould cavity.
  • the main feature of the invention is that the thickness of at least one portion of the mould varies depending on measured or simulated temperature gradients of another mould in use.
  • the other mould may be a known mould having known features.
  • Figure 3A is a longitudinal cross-sectional view of one embodiment of a mould 10 according to the invention and figures 3B and 3C are transversal cross-sectional views of figure 3A at two different heights or altitudes of said mould 10.
  • figures 3B and 3C are provided with an orthogonal two dimensional coordinate system defined by two orthogonal half straight line x and y.
  • the mould 10 comprises an external longitudinal surface 12 and an internal longitudinal surface 14 and can be made of copper or of an alloy including cooper. This kind of mould is also called a mould tube.
  • the mould 10 comprises a plurality of longitudinal elements 16 to 16C extending along an axis z.
  • the elements 16 to 16C may have a plate shape.
  • the mould 10 has a transverse polygonal cross-section and comprises a plurality of internal corners A, B C, D and a plurality of external corners A',E, F, B', B", C", C', C"', D"', D', D" and A"'.
  • the mould element 16 is delimited by two consecutive internal corners A and B and by four consecutive external corners A', B', E, F.
  • the vertical thickness e of said transversal mould element 16 which is the projection of the thickness e on the vertical axis y, continuously varies from one point of said element 16 of the mould 10 between a first vertical thickness e1 and a second thickness e2.
  • the first thickness e1 of the element 16 is the vertical distance between point A and point E
  • the second thickness e2 of the element 16 is the vertical distance between point A and point A'.
  • the thickness of each of the tree other mould elements 16A to 16C respectively delimited by the corners BB'B"C"C'C, CC'C"'D"' D"D'D and DD'D"A"A'A are also varied as above mentioned for the thickness e but in the corresponding horizontal or vertical direction.
  • the figure 3C is a cross-sectional view of figure 3A at another height or altitude of mould 10.
  • the transversal cross-section of the mould 10 has a different shape.
  • a closed transversal element 18 of the mould 10 is delimited by two consecutive internal corners G and J and by four consecutive external corners G', K, L, J'.
  • the first thickness e1' is the horizontal distance between point L and point J and the second thickness is the horizontal distance between point J and point J'.
  • each the tree other closed transversal mould element 18A to 18C in this cross-section of the mould 10 respectively delimited by the corners GG'G"H'" H'H, HH'H"I'I"I and II'I"J"J'J is also varied as above mentioned for the thickness e ' but in the corresponding horizontal or vertical direction.
  • each transversal mould element is symmetrical with respect to a plan passing by the central segment of said transversal mould face and being perpendicular to said transversal mould face.
  • the thickness ( e or e ') as above defined, of a mould face has the same value for two points situated at the same distance with respect to and in both side of the central segment of said mould face.
  • the thickness e varies continuously from the middle of a segment AB, BC, CD or DA of one mould element 16 in the direction of one of the internal corners A, B, C or D of the mould.
  • the variation of the transversal thicknesses of a mould can be limited to the top portion of this mould, the other part of the mould having a constant transversal thickness.
  • the variation of the transversal thickness of a mould can extends longitudinally only between the first 300 and 400 mm of the mould height.
  • the thicknesses in the areas of the corners are equal.
  • the distances AA', BB', CC', DD' are equal to each others and the distances GG,'HH', II', JJ' are also equal to each others.
  • the maximal horizontal and vertical thicknesses of the mould 10 contained in a transversal cross-section of the mould at a given height or altitude of the mould may have the same value.
  • FIG. 3A is a longitudinal cross-section of the mould 10.
  • Each mould 10 element 16A and 16C comprise respectively longitudinal surfaces 20 and 22 each one having a respective thickness e3 and e4.
  • the variation of the thickness e3 and e4 is function of a longitudinal temperature gradient previously measured on another mould in use or is function of a simulated longitudinal temperature gradient of a mould as presented in figures 1 and 2 .
  • the longitudinal thicknesses e3 and e4 of each longitudinal element 16A,16C increases, at least on a portion of the mould, from a point of minimum thickness in both directions defined by a longitudinal axis z.
  • the thicknesses e3 and e4 progressively decrease up to the point P where the thickness is minimum. Then, the thicknesses e3 and e4 increase up to the point P2. After the point P2 the thicknesses e3 and e4 are constant.
  • the distance between point P1 and P can be comprises between 300 and 400mm for a mould having a height of 900mm.
  • the thickness of the element 16B and 16C in a longitudinal cross section of the mould varies also as above mentioned.
  • This variation of thicknesses e3 and e4 allows a more uniform temperature distribution in the mould 10 and at the same time increases heat extraction and decreases internal mould wall temperature.
  • the point P of minimum thickness of the mould 10 is placed approximately between 50 to 100mm from the point of maximum longitudinal temperature previously measured on said other mould in use or previously determined by simulation.
  • This point and the curves of figure 1 and 2 are obtained by experimental measurement based on thermocouples or other measuring systems installed on known moulds in order to find the real temperature profile, or are calculated with proper simulation programs.
  • mould having the same geometrical features than the known mould used to determine the curves of figures 1 and to 2 is machined until the shapes as above mentioned described and shown on the figures are obtained.
  • Moulds for continuous casting of long products are cooled during casting process by mean of a cooling agent, flowing trough an external guided channel surrounding the mould, in order to avoid problems with mechanical distortion and to additionally improve the heat extraction, increase water turbulence and helping in centring the mould inside the water jacket.
  • a cooling jacket designed to receive and at least partially longitudinally surround mould 10.
  • Figure 4A is a longitudinal cross-sectional view of a cooling jacket according to the invention and figures 4B to 4D are transversal cross-sectional views of figure 4A at different height or altitude of the cooling jacket.
  • the cooling jacket 30 for a mould as previously defined comprises internal 32 and external faces 34 delimiting two longitudinal cross-sectional cooling jacket faces 36 and 38.
  • the cooling jacket 30 defines a plurality of cooling ducts 36 for guiding a cooling agent along external surfaces of a mould according to the present invention.
  • the cooling ducts extend at least on a portion of the height of the cooled jacket 30.
  • the cooling jacket 30 is designed to receive and at least partially longitudinally surround said mould 10 and has a complementary form with respect to the mould. In particular, as can be seen on figure 4A , the thicknesses i and i" of the cooling jacket varies along the height of the cooling jacket 30.
  • the cooling jacket 30 has squared cross-sectional shape comprising a plurality of portions 30A to 30 D.
  • the thicknesses i, and i' of the cooling jacket 30 delimited by internal 32 and external faces 34 at a predefined height of the cooling jacket 30 are inversely proportional to the thickness e3 or e4 of a cross sectional longitudinal face 20 or 22 of the mould at the same height of the cooling jacket 30.
  • the thicknesses i and i' increase in the top part of the water jacket 30 up to a maximum value and then diminish up to a minimum value and remain constant in the last part of the water jacket 30.
  • Figure 5A is a longitudinal cross-sectional view of an assembly comprising a cooling jacket 30 and a mould 10' according to the invention and figures 5B and 5C are transversal cross-section of figure 5A at different heights or altitudes of the cooling jacket.
  • the cooling jacket 30 has a longitudinal profile and a transversal profile which follows the different thicknesses e3' and e4' of the external faces(s) of the mould 10' and then has also thicknesses i and i' which depend, at least on a portion of the cooling jacket 30, on a temperature gradient previously measured on another mould in use or on a previously simulated temperature gradient of a mould in use.
  • the cooling jacket 30 comprises to parts which that can be assembled around the mould 10, the assembly being made in a factory.
  • the casting mould above described may also be curved extending along a curved radius and may have different length and/or thickness, depending on the cast product size and chemical composition and depending on the required productivity.
  • the particular design of the assembly mould/cooling jacket prevents mould deformation, and grant higher casting speed, longer mould life and better product quality due to a more uniform heat extraction not only along the mould perimeter but also in longitudinal direction.
  • the uniformity of cooling in billet perimeter allows a more uniform shell growth, preventing possible shape deformations due to differentiate cooling and resulting thermal tensions, while the extension of the mould decreased thickness in the longitudinal direction will increase the heat extraction capability of the mould itself, granting a faster shell growth with related possibility of increased casting speed and productivity.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Continuous Casting (AREA)
EP09425320A 2009-08-04 2009-08-04 Moule pour le moulage en continu de produits longs ou plats, gaine de refroidissement conçue pour coopérer avec un tel moule et ensemble comprenant un tel moule et une telle gaine de refroidissement Withdrawn EP2292350A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP09425320A EP2292350A1 (fr) 2009-08-04 2009-08-04 Moule pour le moulage en continu de produits longs ou plats, gaine de refroidissement conçue pour coopérer avec un tel moule et ensemble comprenant un tel moule et une telle gaine de refroidissement
PCT/EP2010/060916 WO2011023483A1 (fr) 2009-08-04 2010-07-27 Moule pour coulée continue de produits longs ou plats, chemise de refroidissement conçue pour coopérer avec un tel moule, et ensemble comprenant un tel moule et une telle chemise de refroidissement
RU2012108072/02A RU2012108072A (ru) 2009-08-04 2010-07-27 Кристаллизатор для непрерывного литья длинных или плоских изделий, охлаждающая рубашка, используемая вместе с таким кристаллизатором, и узел, содержащий эти кристаллизатор и охлаждающую рубашку
CN2010800345153A CN102470425A (zh) 2009-08-04 2010-07-27 用于连续铸造长型或平型产品的结晶器、设计成与这种结晶器配合的冷却套及包括这种结晶器和这种冷却套的组件
EP10745581A EP2461924A1 (fr) 2009-08-04 2010-07-27 Moule pour coulée continue de produits longs ou plats, chemise de refroidissement conçue pour coopérer avec un tel moule, et ensemble comprenant un tel moule et une telle chemise de refroidissement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09425320A EP2292350A1 (fr) 2009-08-04 2009-08-04 Moule pour le moulage en continu de produits longs ou plats, gaine de refroidissement conçue pour coopérer avec un tel moule et ensemble comprenant un tel moule et une telle gaine de refroidissement

Publications (1)

Publication Number Publication Date
EP2292350A1 true EP2292350A1 (fr) 2011-03-09

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Application Number Title Priority Date Filing Date
EP09425320A Withdrawn EP2292350A1 (fr) 2009-08-04 2009-08-04 Moule pour le moulage en continu de produits longs ou plats, gaine de refroidissement conçue pour coopérer avec un tel moule et ensemble comprenant un tel moule et une telle gaine de refroidissement
EP10745581A Withdrawn EP2461924A1 (fr) 2009-08-04 2010-07-27 Moule pour coulée continue de produits longs ou plats, chemise de refroidissement conçue pour coopérer avec un tel moule, et ensemble comprenant un tel moule et une telle chemise de refroidissement

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP10745581A Withdrawn EP2461924A1 (fr) 2009-08-04 2010-07-27 Moule pour coulée continue de produits longs ou plats, chemise de refroidissement conçue pour coopérer avec un tel moule, et ensemble comprenant un tel moule et une telle chemise de refroidissement

Country Status (4)

Country Link
EP (2) EP2292350A1 (fr)
CN (1) CN102470425A (fr)
RU (1) RU2012108072A (fr)
WO (1) WO2011023483A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6126503B2 (ja) * 2013-09-20 2017-05-10 株式会社神戸製鋼所 耐サワーラインパイプ鋼スラブの品質判定による向け先変更方法
CN113333691B (zh) * 2021-05-25 2023-01-31 上海交通大学 一种用于大高径比高温合金铸锭的铸模及应用

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2300640A1 (fr) * 1975-02-14 1976-09-10 Rossi Irving Moules pour coulee continue de metaux, notamment acier
JPS6149751A (ja) * 1984-08-17 1986-03-11 Nippon Steel Corp 連続鋳造用鋳型
WO1996035533A1 (fr) * 1995-05-09 1996-11-14 Sandvik Aktiebolag Moule de coulee en continu
EP0958871A1 (fr) * 1998-05-18 1999-11-24 Concast Standard Ag Lingotière pour la coulée continue des barres substantiellement polygonale
WO2003092930A2 (fr) * 2002-04-27 2003-11-13 Sms Demag Aktiengesellschaft Coquille de coulee continue pour metaux liquides, en particulier pour acier liquide

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE105750T1 (de) * 1991-02-06 1994-06-15 Concast Standard Ag Kokille zum stranggiessen von metallen, insbesondere von stahl.
TWI268821B (en) * 2002-04-27 2006-12-21 Sms Demag Ag Adjustment of heat transfer in continuous casting molds in particular in the region of the meniscus
UA79025C2 (uk) * 2002-11-13 2007-05-10 Смс Демаг Акцієнгезелльшафт Кристалізатор для безперервного розливу рідких металів, зокрема сталей, при високій швидкості розливу для одержання полігональних сортових, чорнових і призначених для прокату на блюмінгу заготовок

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2300640A1 (fr) * 1975-02-14 1976-09-10 Rossi Irving Moules pour coulee continue de metaux, notamment acier
JPS6149751A (ja) * 1984-08-17 1986-03-11 Nippon Steel Corp 連続鋳造用鋳型
WO1996035533A1 (fr) * 1995-05-09 1996-11-14 Sandvik Aktiebolag Moule de coulee en continu
EP0958871A1 (fr) * 1998-05-18 1999-11-24 Concast Standard Ag Lingotière pour la coulée continue des barres substantiellement polygonale
WO2003092930A2 (fr) * 2002-04-27 2003-11-13 Sms Demag Aktiengesellschaft Coquille de coulee continue pour metaux liquides, en particulier pour acier liquide

Also Published As

Publication number Publication date
RU2012108072A (ru) 2013-09-10
WO2011023483A1 (fr) 2011-03-03
EP2461924A1 (fr) 2012-06-13
CN102470425A (zh) 2012-05-23

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