EP2054178B1 - Kristallisator - Google Patents

Kristallisator Download PDF

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Publication number
EP2054178B1
EP2054178B1 EP07802561.6A EP07802561A EP2054178B1 EP 2054178 B1 EP2054178 B1 EP 2054178B1 EP 07802561 A EP07802561 A EP 07802561A EP 2054178 B1 EP2054178 B1 EP 2054178B1
Authority
EP
European Patent Office
Prior art keywords
grooves
crystalliser
row
temperature
blooms
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.)
Not-in-force
Application number
EP07802561.6A
Other languages
English (en)
French (fr)
Other versions
EP2054178A1 (de
Inventor
Nuredin Kapaj
Gianluca Bazzaro
Alfredo Poloni
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.)
Danieli and C Officine Meccaniche SpA
Original Assignee
Danieli and C Officine Meccaniche SpA
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Filing date
Publication date
Application filed by Danieli and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Publication of EP2054178A1 publication Critical patent/EP2054178A1/de
Application granted granted Critical
Publication of EP2054178B1 publication Critical patent/EP2054178B1/de
Not-in-force 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
    • B22D11/055—Cooling the moulds

Definitions

  • the present invention relates to a crystalliser, in particular to a tubular crystalliser for continuous casting of blooms, billets or rods.
  • crystallisers are known and used in continuous casting of liquid steel in an ingot mould.
  • the main tasks which must be performed by a crystalliser are to guarantee good heat transfer from the steel outwards, so as to favour solidification, and to lubricate its internal surface which comes into contact with the steel to prevent problems of sticking and breakage of the skin of the billet which is forming with the consequent break-out of molten material.
  • tubular crystallisers having a thin thickness, ranging from 5 to 8 mm, were used for continuous casting of billets and blooms. In this way the attempt was to intensify steel cooling in order to guarantee a rapidly solidified skin.
  • the crystalliser was not sufficiently stiff and consequently was highly deformed causing also the deformation of the cast product which presented geometrical shape defects, such as rhomboid errors, and off-corner cracks.
  • the thickness of the crystalliser was increased to values equal to approximately 10% of the side of the cast product.
  • the problem of excessive deformation of the cast product was partially solved in this way, however to the detriment of heat transfer and the creation of other problems, such as:
  • the temperature on the internal wall of the crystalliser drastically increases when the casting speed increases.
  • the plastic deformation of the crystalliser also increases.
  • the high temperature on the internal wall of the crystalliser, especially in the meniscus area is a severe problem especially for free jet casting because the lubrication oil flowing on the internal wall is burnt and consequently there is no more lubricant between the billet, or other cast product, and the crystalliser.
  • the solidified skin breaks causing the break-out of liquid steel, interrupting the casting process and at the same time soiling the casting line with considerably increase of production times and costs.
  • crystalliser described in GB2177331 .
  • Such crystalliser is provided on its external surface with longitudinal cooling grooves of a predetermined length. These grooves, essentially parallel to each other, each define a direction essentially parallel to the longitudinal axis of the crystalliser or die. They are arranged along a single horizontal row at the molten material meniscus which fluctuates during casting. The most intense thermal deformation occurs, indeed, on the portion of internal wall of the die corresponding to this region.
  • the primary object of the present invention is to construct a crystalliser for continuous casting of blooms and billets, provided on the external surface with grooves or channels, made for example by milling and in which cooling water flows, said grooves being appropriately dimensioned and being distributed so as to obtain an optimal cooling of the internal wall of the crystalliser thus making its temperature nearly uniform.
  • a further object of the present invention is to make a crystalliser of considerable stiffness despite of being not very thick.
  • the present invention aims to reach the objects discussed above by making a crystalliser for continuous casting of blooms, billets or rods which, according to claim 1, comprises a tubular structure defining a longitudinal axis and whose section on a plane orthogonal to said axis defines the shape of said blooms, billets or rods, longitudinal grooves made on an external surface of said tubular structure, characterised in that said grooves are arranged on at least two rows essentially orthogonal to said axis and the grooves on one row are staggered with respect to the grooves of another adjacent row.
  • cooling channels were made on the external wall of the crystalliser, by milling or electron discharge machining or chemical evaporation.
  • cooling channels are advantageously arranged on horizontal rows, mutually staggered one row with respect to the other, and have different depths.
  • the maximum depth is obtained at the meniscus zone where the highest temperatures occur in the conventional tubular crystalliser.
  • the risk of sticking of the skin on the wall of the crystalliser, and consequent breakage of the skin itself with break-out of the liquid metal, is also reduced.
  • the low temperatures on the internal wall of the crystalliser allow the lubricant to flow along the wall itself without being burnt, also in the case of free jet casting.
  • a first embodiment of the crystalliser of the invention comprising a monolithic tube 1, preferably made of copper, defining a longitudinal axis X and having either a square or a rectangular or a round cross section, according to the shape of the product to be cast.
  • Cooling grooves or channels 2, 2' arranged along a plurality of rows essentially orthogonal to said axis X are made by milling, electron discharge machining or chemical evaporation on the external wall of the crystalliser. In the case of Fig. 1 , there are preferably two rows.
  • Said grooves 2, 2' advantageously present an appropriate distribution on said external wall and appropriate dimensions so as to obtain an optimal heat exchange and therefore an optimal cooling of the internal wall of the crystalliser, making the temperature on it nearly uniform, with low gradients along the thickness and along the longitudinal extension of the crystalliser.
  • the isothermal lines on the internal surface of the crystalliser are of the half elliptical or parabolic type, as lines 3 and 4 shown in Fig. 2 .
  • the region indicated with reference 5 is the one presenting the maximum temperatures because it corresponds to the region of the meniscus; the adjacent region indicated with reference 6, comprised between two isothermal lines 3, 4, presents instead lower temperatures.
  • each zone between the two adjacent isothermal lines 3, 4 has a different temperature range.
  • corresponding grooves 2' with differentiated depth between each zone and with the distribution shown in Fig. 1 were made on the external surface.
  • grooves 2 were made at region 5.
  • grooves 2, 2' are arranged along horizontal rows, one for each region, according to a distribution with tends to cover regions 5 and 6 respectively following the profile of isothermal lines 3 and 4. The longitudinal extension of the different grooves is therefore different.
  • grooves 2 are deeper because it is in region 5 corresponding to the meniscus that, in the conventional tubular crystalliser, the highest temperatures occur. In region 6, instead, grooves 2' are less deep so as to uniform the temperature on the internal wall of the crystalliser. In this way, temperature uniformity is obtained between the various zones thus reducing the thermal gradients on the crystalliser wall and consequently its non-uniform deformation.
  • a further advantage of the crystalliser of the invention is represented by the fact that in region 6 grooves 2' are staggered with respect to grooves 2 of region 5 in order to guarantee a higher stiffness of the crystalliser itself and, at the same time, to increase the turbulence of the cooling water, and ultimately, the heat exchange coefficient.
  • Fig. 3 shows a second embodiment of the crystalliser of the invention in which three horizontal rows 11, 12, 13 of grooves or channels are provided on the external surface.
  • Each row is advantageously staggered with respect to the row above and/or to the row underneath to increase the stiffness of the tubular structure and the heat exchange.
  • the longitudinal extension is the same for all grooves, but their depth varies.
  • the depth is advantageously decreasing from the first row 11 of grooves towards the third row 13.
  • the differentiated depth guarantees a uniform temperature between the various zones and consequently less deformation of the crystalliser.
  • the crystalliser is cooled by means of the water, circulating on its external surface, which therefore slides within the longitudinal grooves.
  • the crystalliser of the invention may be used in particular for the production of billets with section from 50x50 mm to 200x200 mm, for the production of blooms having longer side from 200 to 600 mm and for the production of rods of any diameter.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Claims (6)

  1. Kristallisator zum kontinuierlichen Gießformen von Luppen, Walzblöcken und Rundstäben, umfassend
    - eine rohrförmige Struktur (1), die eine Längsachse (X) definiert und deren Querschnitt auf einer Ebene orthogonal zu der Achse (X) die Form der Luppen, Walzblöcke oder Rundstäbe definiert;
    - Längsrillen (2, 2'), die auf einer äußeren Fläche der rohrförmigen Struktur (1) erhalten wurden;
    dadurch gekennzeichnet, daß die Rillen (2, 2') auf wenigstens zwei Reihen (11, 12) angeordnet sind, die im Wesentlichen orthogonal zu der Achse (X) sind, und daß die Rillen (2) einer Reihe (11) versetzt sind in Bezug auf die Rillen (2') einer anderen benachbarten Reihe (12).
  2. Kristallisator nach Anspruch 1, wobei die Rillen einer Reihe (11) eine Tiefe aufweisen, die verschieden ist von derjenigen einer anderen benachbarten Reihe (12).
  3. Kristallisator nach Anspruch 1 oder 2, wobei eine erste Reihe (11) von Rillen (2) in dem Bereich angeordnet ist, in dem ein Gießspiegel während des Gießformens eines geschmolzenen Metalls gebildet ist, und wenigstens eine zweite Reihe (12) Rillen (2') unterhalb der ersten Reihe (11) vorgesehen ist.
  4. Kristallisator nach Anspruch 3, wobei die Rillen der ersten Reihe (11) tiefer sind als die Rillen der zweiten Reihe (12).
  5. Kristallisator nach Anspruch 4, wobei eine dritte Reihe (13) Rillen unterhalb der zweiten Reihe (12) vorgesehen ist.
  6. Kristallisator nach Anspruch 5, wobei die Rillen der dritten Reihe (13) weniger tief sind als die Rillen der zweite Reihe (12).
EP07802561.6A 2006-08-11 2007-08-10 Kristallisator Not-in-force EP2054178B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20061622 ITMI20061622A1 (it) 2006-08-11 2006-08-11 Ctristallizzatore
PCT/EP2007/058295 WO2008017711A1 (en) 2006-08-11 2007-08-10 Crystalliser

Publications (2)

Publication Number Publication Date
EP2054178A1 EP2054178A1 (de) 2009-05-06
EP2054178B1 true EP2054178B1 (de) 2014-03-05

Family

ID=37896078

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07802561.6A Not-in-force EP2054178B1 (de) 2006-08-11 2007-08-10 Kristallisator

Country Status (3)

Country Link
EP (1) EP2054178B1 (de)
IT (1) ITMI20061622A1 (de)
WO (1) WO2008017711A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101984106B (zh) * 2010-11-10 2013-03-06 河南通宇冶材集团有限公司 一种薄板坯连铸结晶器用低银铜合金板材及制造方法
ITUD20110211A1 (it) * 2011-12-23 2013-06-24 Danieli Off Mecc Cristallizzatore per colata continua
ITUB20150498A1 (it) * 2015-05-05 2016-11-05 Danieli Off Mecc Cristallizzatore per la colata continua
EP3406368A1 (de) * 2017-05-23 2018-11-28 SMS Concast AG Kokille zum stranggiessen von metallischen produkten

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI852493L (fi) * 1985-06-24 1986-12-25 Outokumpu Oy Kokill.
DE19508169C5 (de) * 1995-03-08 2009-11-12 Kme Germany Ag & Co. Kg Kokille zum Stranggießen von Metallen

Also Published As

Publication number Publication date
WO2008017711A1 (en) 2008-02-14
ITMI20061622A1 (it) 2008-02-12
EP2054178A1 (de) 2009-05-06

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