EP1934004A2 - Kokille zum brammengiessen - Google Patents

Kokille zum brammengiessen

Info

Publication number
EP1934004A2
EP1934004A2 EP06793737A EP06793737A EP1934004A2 EP 1934004 A2 EP1934004 A2 EP 1934004A2 EP 06793737 A EP06793737 A EP 06793737A EP 06793737 A EP06793737 A EP 06793737A EP 1934004 A2 EP1934004 A2 EP 1934004A2
Authority
EP
European Patent Office
Prior art keywords
ingot mold
symmetry
plane
section
cross
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
EP06793737A
Other languages
English (en)
French (fr)
Other versions
EP1934004B1 (de
Inventor
Gianpietro Benedetti
Nuredin Kapaj
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
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 Danieli and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Publication of EP1934004A2 publication Critical patent/EP1934004A2/de
Application granted granted Critical
Publication of EP1934004B1 publication Critical patent/EP1934004B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B22D11/0408—Moulds for casting thin slabs

Definitions

  • the present invention relates to an ingot mold for casting ultra thin slabs to be used, in particular, in a manufacturing plant for the manufacture of metal strips.
  • ingot molds used for casting metal strips, in particular of steel, are known in the state of the art. These ingot molds can produce a slab which is subjected to a number of thickness reductions, sometimes associated with surface treatments and machining, depending on the process used.
  • the fluid mechanics inside the crystallizer is not optimal inasmuch as a reduced volume of molten steel, resulting from the reduced thickness, does not allow good tur- bulence damping which can cause an unstable meniscus, hence with unwanted incorporation of the lubrication powders, which could also cause remelting phenomena of the solidified skin.
  • One main purpose of the present invention is to achieve an ingot mold for casting ultra thin slabs to be used, for instance, in a manufacturing plant for the manufacture of metal strips, in particular steel strips.
  • Another purpose of the ingot mold, according to the invention is to produce thin thicknesses, about 20mm, at high casting speeds, up to 16 m/min, thereby ensuring good quality inside the slab.
  • the present invention intends to solve the foregoing problems by achieving an ingot mold for casting ultra thin (20 - 50 mm) steel slabs, with casting speed between 6 and 16m/min, thus defining a longitudinal plane of symmetry and a cross- sectional plane of symmetry, reciprocally orthogonal, comprising a passing cavity with an entrance section and an exit section of the steel, the cavity surface consisting of two first walls - arranged reciprocally facing two opposite sides of the longitudinal plane of symmetry and with respective concavities facing the longitudinal plane of symmetry - and two second narrow rectangular walls bcated parallel to the cross- sectional plane of symmetry, wherein the first and second walls form four longitudinal corners in the reciprocal connecting areas and where - in a section located on a cross-sectional plane perpendicular to the longitudinal and cross-sectional planes of symmetry - the respective concavities are in the shape of a semi-circular arc of a predetermined radius whereby the straight line tangent to the semi-circular arc intersecting the relative
  • the ingot mold by using the ingot mold it is possible to cast a slab with a thickness much smaller than the thickness that can be achieved with known ingot molds, between 20 ⁇ 50mm, yet helping maintain a certain length of liquid core downstream of the exit section of the ingot mold, and wherein the core remains liquid even in the zones nearest the furthermost side parts.
  • the slab when the slab is subjected to the liquid core pre-rolling, it will be possible to obtain a refinement of the internal structure by reducing central porosity as well as the segregation phenomenon.
  • the possibility to cast ultra thin slabs of the above-mentioned dimensions makes it possible to achieve metal strip machinery with a reduced height and length compared to the machinery known in the art.
  • the strip obtained at the end of the passage throughout the whole hot-rolling and casting line is already at its final thickness and ready to be used, without a need to carry out an additional treatment in a cold-rolling line.
  • Fig. 1 represents a three-dimensional view of an ingot mold of the invention
  • Fig. 2a represents a section along the plane y-z of the ingot mold of Fig. 1
  • Fig. 2b represents a plan view of the ingot mold of Fig. 1 ;
  • Fig. 3a represents a section along the plane y-z of another embodiment of the ingot mold of Fig. 1 ;
  • Fig. 3b represents a plan view of the embodiment of Fig. 3a;
  • Fig. 4 represents a semi-section view along the plane x-y of the ingot mold of Fig. 1 .
  • x, y, z there is a representation of an ingot mold - with a longitudinal plane of symime- try X parallel to the axes of reference x-z, and a cross-sectional plane of symmetry Y parallel to the reference axes y-z - comprising two wide plates 1 , 2 which, when coupled, define a through cavity 3 or basin or casting chamber.
  • the surface of said cavity is defined by two wide walls 4, 5, reciprocally arranged and facing out on opposite sides relative to the plane of symmetry X, and by two narrow walls 6, 7 generally flat, rectangular and parallel, arranged at a right angle relative to the plane of symmetry X.
  • the wide and narrow walls form four longitudinal corners in their connecting zones.
  • the wide walls 4, 5 are concave.
  • the concavity faces the longitudinal plane of symmetry X.
  • the concavity of the walls 4, 5 is such as to define a section of the lenticular- shaped basin.
  • the tangent to the semi-circular arc of the wide walls 4, 5 intersecting the related corner will form an angle ?, the value of which is between 1 °and 19°, with a plane parallel to the plane of symmetry X.
  • the range of the angle ? ensures the presence of low stresses and limited deformations on the skin in the narrow walls zone and therefore the possibilities of tearing the skin are minimal, resulting in spillage of the molten steel, known as the "break-out" phenomenon.
  • An elliptical section, rather than a lenticular section, would involve radii of curvature, hence greater angles.
  • the ingot mold, according to the invention - wherein "I” is the distance between the narrow walls and “f” is the camber of the concave walls 4, 5 of the basin - advantageously has the following values in the entrance section: - "I” is between 750 and 2000 mm; - "f” is between 15 and 100 mm.
  • the ingot mold or lenticular crystallizer of the invention prevents the edges from excessively pivoting during pre-rolling, thereby avoiding cracks or other flaws in these zones.
  • the internal structure of such ingot mold ensures a suitable volume of molten steel, thus when the slab comes out, there will still be a certain length of the liquid core.
  • the lenticular shape maintains the liquid core even when very close to the furthermost sides of the slab, thereby making a subsequent liquid core pre-rolling possible, the so-called "soft reduction", for the cast slab.
  • a first advantageous variation of the ingot mold includes an entrance section for the steel section larger than the exit section located near the bottom end of the ingot mold.
  • the radius of curvature of the semi-circular arc on the cross-sectional plane has a linearly increasing value between the entrance section and a predetermined intermediate section, which corresponds to the terminal section of the casting chamber before the exit section of the steel. This will ensure a suitable distance of the submerged unloading device from the wide walls, thereby preventing unwanted solidification bridges.
  • the ingot mold of this invention includes an inclination of the walls of said casting chamber, converging towards said intermediate section, determined by an angle a (0° - 7°) wherein said angle a is measured according to the plane of symmetry z-y.
  • the bottom end of the ingot mold advantageously includes a portion 10 with a parallel-generating line, the length of which has been predetermined and shaped as the basin to allow the insertion and the removal of the dummy bar inside of it, thus used for starting the continuous casting process.
  • a second variation of the ingot mold according to the invention includes entrance and exit sections of equal dimensions, as described in the section in Fig. 3a.
  • the radius of curvature of the semi-circular arc on the cross-sectional plane has the same value in each point of the longitudinal extension of the cavity between the entrance section and the exit section of the steel.
  • the narrow walls 6, 7 can change their tapering shape. More precisely, they can be moved inward towards the exit section of the steel so as to reduce the width of the exit section, thus avoiding shrinkage problems during the solidification in the ingot mold.
  • the casting of very thin slabs, through the ingot mold of the invention, allows for the possibility to create a starting product, i.e. the slab thereof, with a thickness which is already very close to that of the finished product, namely the strip.
  • the thickness of these thin slabs, when exiting is between 20 and 50 mm and their casting speed is between 6 and 16 m/min.
  • the typical convex shape of the slab in other words the central swelling at the exit of the ingot mold, is cancelled, that is flattened, through the use of rollers placed at the foot of the ingot mold and appropriately shaped, thus performing the liquid core pre- rolling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP06793737.5A 2005-09-22 2006-09-22 Kokille zum brammengiessen Not-in-force EP1934004B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20051762 ITMI20051762A1 (it) 2005-09-22 2005-09-22 Lingottiera per colata di bramme
PCT/EP2006/066617 WO2007039485A2 (en) 2005-09-22 2006-09-22 Ingot mold for casting slabs

Publications (2)

Publication Number Publication Date
EP1934004A2 true EP1934004A2 (de) 2008-06-25
EP1934004B1 EP1934004B1 (de) 2014-11-05

Family

ID=36128592

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06793737.5A Not-in-force EP1934004B1 (de) 2005-09-22 2006-09-22 Kokille zum brammengiessen

Country Status (3)

Country Link
EP (1) EP1934004B1 (de)
IT (1) ITMI20051762A1 (de)
WO (1) WO2007039485A2 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1262073B (it) * 1993-02-16 1996-06-19 Danieli Off Mecc Lingottiera per colata continua di bramme sottili
DE4343124C2 (de) * 1993-12-17 1996-05-23 Schloemann Siemag Ag Kokille zum Stranggießen von Stahlband
DE10290453D2 (de) * 2001-02-09 2004-01-15 Evertz Egon Kg Gmbh & Co Stranggießkokille

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007039485A2 *

Also Published As

Publication number Publication date
WO2007039485A3 (en) 2007-06-07
EP1934004B1 (de) 2014-11-05
ITMI20051762A1 (it) 2007-03-23
WO2007039485A2 (en) 2007-04-12

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