EP0179364B1 - Lingotière de coulée continue pour billettes d'acier à section transversale polygonale - Google Patents

Lingotière de coulée continue pour billettes d'acier à section transversale polygonale Download PDF

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Publication number
EP0179364B1
EP0179364B1 EP85112893A EP85112893A EP0179364B1 EP 0179364 B1 EP0179364 B1 EP 0179364B1 EP 85112893 A EP85112893 A EP 85112893A EP 85112893 A EP85112893 A EP 85112893A EP 0179364 B1 EP0179364 B1 EP 0179364B1
Authority
EP
European Patent Office
Prior art keywords
continuous casting
strand
edge
section
mold
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
Application number
EP85112893A
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German (de)
English (en)
Other versions
EP0179364A2 (fr
EP0179364A3 (en
Inventor
Arthur Vaterlaus
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.)
Concast Service Union AG
Original Assignee
Concast Service Union 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
Application filed by Concast Service Union AG filed Critical Concast Service Union AG
Priority to AT85112893T priority Critical patent/ATE35785T1/de
Publication of EP0179364A2 publication Critical patent/EP0179364A2/fr
Publication of EP0179364A3 publication Critical patent/EP0179364A3/de
Application granted granted Critical
Publication of EP0179364B1 publication Critical patent/EP0179364B1/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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/055—Cooling the moulds

Definitions

  • the invention relates to a continuous mold for the continuous casting of steel strands with an essentially polygonal cross-section, the mold cavity being provided with a casting cone in the strand running direction.
  • Chill molds with a four, six and polygonal cross section of the mold cavity are known. Such molds are provided with a pouring cone in the direction of the strand to compensate for the shrinkage of the solidifying strand crust.
  • the casting cone is adapted as precisely as possible to the steel quality, the casting temperature, etc., it has so far not been possible to achieve a uniform strand crust growth within the mold over the circumference.
  • the strand crust in particular in the case of large bloom and slab cross sections, can be up to 50% and more thinner at individual points than neighboring strand crust regions. If the strand crust is pulled away from the mold wall by shrinkage stresses etc. and the cooling in areas with a thin strand crust is reduced over a longer distance, breakthroughs inside or outside the mold can occur due to reheating and / or cracking.
  • the invention has for its object to eliminate the shortcomings and disadvantages described in molds according to the preamble and in particular to improve the uniformity of the strand cooling in the corner areas. This is intended to achieve an increased strand geometry and an improvement in the strand surface. Also, strand breaks that are due to uneven cooling in the mold should be avoided both inside and outside the mold. Another objective is to prevent cracks on the strand surface or internal cracks in the edge areas, which reduce the quality of the end products.
  • the continuous casting mold according to the invention it is possible to solidify a uniformly thick strand crust even in the corner areas of the strand within the mold. As a result, not only can an improved strand geometry be achieved, breakthroughs inside and outside the mold can also be avoided.
  • the uniform solidification of the strand crust further prevents the formation of edge cracks on and below the surface, which further improves the strand quality.
  • the angle reduction can take place in one or more steps.
  • the edge angle can be reduced to a greater extent along the pouring-in section and to a lesser extent along the outlet-side section.
  • Chill molds with convex and flat walls are known in the prior art. In order to achieve favorable manufacturing costs, it is recommended according to a further feature in the case of molds with an essentially rectangular mold cavity that the walls or wall sections forming the angle are designed as flat surfaces. In the case of such molds, it is additionally proposed to start with an edge angle of 90 ° in the area of the bath level, which then gradually decreases in the direction of the strand.
  • the wall formation along the edge required for the reduction in angle is advantageously only applied on one side of the edge for processing reasons.
  • the narrow side of plate molds is ideal for this.
  • the inclined surface adapted to the intended reduction in angle can, for example, only extend over a partial width in the edge region or up to the middle of the narrow side.
  • a narrow side 3 abuts two broad sides 4, 4 'which are partially shown.
  • This plate mold 2 represents a continuous mold for the continuous casting of ingots and slabs. It has a polygonal mold cavity 5 with an essentially rectangular cross section. It would also be conceivable for the mold cavity to be hexagonal or octagonal, etc.
  • the mold cavity 5 is provided with a casting cone 6 on the narrow side 3 and, for example, with a casting cone 7, 7 'on the broad sides 4, 4'.
  • the edge angles of the mold cavity 5, designated 9, 9 ' are, for example, 90 ° on the mold-side delimitation surface. They decrease in the strand running direction to edge angles 10, 10 '.
  • a strand crust 20, which has an edge angle 25, is shown shortly before it emerges from the mold.
  • dash-dot mold walls are shown with edge angles larger than angles 25, which led the strand crust 20 on its way through the mold before the cut in FIG. 2.
  • the angle 21 at the mold entrance is also 90 ° here. But it could also be larger than 90 °.
  • the angles 22, 23, 24 represent intermediate stages of the continuous angle reduction during the passage of the strand crust 20 through the mold. The angle reduction in this example is exaggerated for clearer identification.
  • Arrows 26 and 27 show tensile stresses caused by the shrinkage of the strand crust 20.
  • Arrows 29 show compressive stresses directed to a line 28, which are caused by the angle reductions 22-25.
  • the tensile stresses as represented by the arrows 26 and 27, and the tensile or shrinkage stresses which arise in the corner itself can cause cracks along the line 28.
  • the reduction in the edge angle 22-25 is therefore dimensioned such that the tensile stresses in the strand crust corner, which are generated by the shrinkage, are at least reduced, compensated or converted into compressive stresses according to the arrows 29.
  • the angle reductions 22-25 also make it possible to avoid all signs of detachment of the strand crust 20 from the cooled mold wall in the area of the corners, thereby achieving a uniform crust growth, in particular a uniform crust thickness. This prevents cracks and breakthroughs in the edge area.
  • the angular reduction becomes the dwell time of the strand crust in the mold, i.e. adjusted to the average pull-out speed.
  • the steel composition, type of cast powder slag, pouring temperature, thermal conductivity of the cooled mold wall and mold length etc. are decisive for the reduction in angle.
  • Advantageous values for the reduction of the edge angle in the case of essentially rectangular steel strands are between 0.2 ° and 4 °, preferably between 0.2 ° and 2 °. Casting speeds of approximately 1 m to 1.5 m per minute are assumed. If, for example, the edge angle reduction is chosen too large, signs of wear occur due to excessive friction between the mold wall and the strand over the height range of the angle reduction of the mold wall. If the angular reduction is too small, the inside and / or outside cracks known in the prior art occur at the edges due to detachment of the strand crust and irregular crust growth in the edge area and edge breakthroughs.
  • a narrow side wall 50 is provided with a roof-shaped surface that is different from that in FIGS. 3, 4, 5.
  • a roof is formed by surfaces 51 and in a section 55 on the outlet side by surface 52.
  • a dash-dotted line 58 a roof shape is shown as a variant which, together with a broad side on the outlet-side section 55, would result in a constant edge angle.
  • the angle reduction extends in this example only over part-width sections 59, 59 'of the mold wall.
  • a wall middle part with a width 60 is provided with a casting cone.
  • FIGS. 8 and 9 Another variant is shown in FIGS. 8 and 9, wherein a surface 80 has a pouring cone along the line 81. Below a bath level 82, an angular reduction over part length 84 is applied along line 83. The strand edge no longer deforms along the partial length 85.
  • mold cavities are shown with an essentially rectangular cross section.
  • the walls or wall sections forming the angles are formed from straight lines.
  • An example is shown in FIG. 10, in which an angle 92 on the pouring side of the mold is greater than 90 ° and an angle 90 on the exit side of the mold is 90 °.
  • a straight boundary surface 93 instead of a straight boundary surface 93, a curved boundary surface could also be selected.
  • the angle reduction extends only over a partial area 95 of the total width of a narrow side 96.
  • a casting cone 97 is matched to the angle reduction so that the narrow side of a cast strand lies against the mold wall over its entire width .
  • the continuous coke according to the invention can be used for straight or curved mold cavities, for horizontal, oblique or vertical continuous casting.
  • the invention is also not tied to a mold design. It can be constructed as a plate, tube or block mold.
  • a further advantageous application of the invention can be achieved with molds which are adjusted in their format during a running casting and which are described in EP patent 0 028 766.

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

Claims (9)

1. Lingotière de coulée continue pour couler en continu des barres d'acier de section droite essentiellement polygonale, dont la cavité de formage est pourvue d'un cône de coulée dans le sens de l'avance de la barre, caractérisée en ce que, dans au moins un segment (54, 84) de la cavité de formage situé du côté par lequel l'acier est coulé dans la lingotière, la section droite polygonale de la cavité de formage (5) présente des angles d'arête (9, 10; 21-25; 90, 92) qui se réduisent, dans le sens de l'avance de la barre (56), à des valeurs préfixées compensant la contraction de la croûte de la barre (20).
2. Lingotière selon la revendication 1, caractérisée en ce que l'angle d'arête (21-25) diminue de façon continue sur au moins une partie (54, 84) de la longueur de la lingotière.
3. Lingotière selon la revendication 1 ou 2, caractérisée en ce que les angles d'arête (21-25) se réduisent sur le segment (54, 84) côté coulée et restent constants sur le segment (55, 85) côté sortie.
4. Lingotière selon la revendication 1 ou 2, caractérisée en ce que les angles d'arête (21-25) se réduisent plus fortement le long du segment (54) côté coulée et plus faiblement le long du segment (55) côté sortie.
5. Lingotière selon une des revendications 1-4, caractérisée en ce que la réduction d'angle dans le sens de l'avance de la barre (54) présente une tendance à l'augmentation dans le segment (54) côté coulée.
6. Lingotière selon une des revendications 1-5, caractérisée en ce que, dans le cas de lingotières possédant des cavités de formage (5) essentiellement rectangulaires, les parois (3, 4) formant les angles (9, 10) sont réalisées comme des faces planes.
7. Lingotière selon une des revendications 1-6, caractérisée en ce que la cavité de formage (5), de forme essentiellement rectangulaire, présente des angles de 90° dans la région de la surface du bain et que la réduction d'angle est réalisée par la conformation adéquate de la paroi d'un côté seulement de l'arête.
8. Lingotière selon une des revendications 1-6, caractérisée en ce que la cavité de formage de forme essentiellement rectangulaire présente des angles (92) supérieurs à 90° dans la région de la surface du bain.
9. Lingotière selon une des revendications 1-8, caractérisée en ce que les faces obliques prévues pour la réduction des angles (22-25) s'étendent seulement sur des parties (59, 59', 95) de la largeur dans la région des arêtes de la paroi (50, 96) de la lingotière.
EP85112893A 1984-10-26 1985-10-11 Lingotière de coulée continue pour billettes d'acier à section transversale polygonale Expired EP0179364B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85112893T ATE35785T1 (de) 1984-10-26 1985-10-11 Durchlaufkokille zum stranggiessen von stahlstraengen mit polygonalem querschnitt.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH5133/84 1984-10-26
CH5133/84A CH664915A5 (de) 1984-10-26 1984-10-26 Durchlaufkokille zum stranggiessen von stahlstraengen mit polygonalem querschnitt.

Publications (3)

Publication Number Publication Date
EP0179364A2 EP0179364A2 (fr) 1986-04-30
EP0179364A3 EP0179364A3 (en) 1987-04-01
EP0179364B1 true EP0179364B1 (fr) 1988-07-20

Family

ID=4288494

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85112893A Expired EP0179364B1 (fr) 1984-10-26 1985-10-11 Lingotière de coulée continue pour billettes d'acier à section transversale polygonale

Country Status (5)

Country Link
EP (1) EP0179364B1 (fr)
JP (1) JPS61103649A (fr)
AT (1) ATE35785T1 (fr)
CH (1) CH664915A5 (fr)
DE (1) DE3563822D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012207786A1 (de) 2012-05-10 2013-11-14 Sms Siemag Ag Stranggießkokille

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3627991A1 (de) * 1986-08-18 1988-02-25 Mannesmann Ag Verfahren zum stranggiessen von brammen und einrichtung zur durchfuehrung des verfahrens
FR2649918B1 (fr) * 1989-07-19 1994-06-10 Lorraine Laminage Lingotiere a plaques pour la coulee continue de metal
US5082746A (en) * 1990-04-20 1992-01-21 Forward Gordon E As-continuously cast beam blank and method for casting continuously cast beam blank
ATE105750T1 (de) * 1991-02-06 1994-06-15 Concast Standard Ag Kokille zum stranggiessen von metallen, insbesondere von stahl.
AT404235B (de) * 1995-04-18 1998-09-25 Voest Alpine Ind Anlagen Stranggiesskokille
CA2228489C (fr) 1995-08-03 2007-01-30 Europa Metalli S.P.A. Elements de plomberie a faible liberation de plomb constitues d'alliages a base de cuivre contenant du plomb et procede de fabrication correspondant
US6461534B2 (en) 1997-11-19 2002-10-08 Europa Metalli S. P. A. Low lead release plumbing components made of copper based alloys containing lead, and a method for obtaining the same
KR101360564B1 (ko) * 2011-12-27 2014-02-24 주식회사 포스코 연속주조 주형

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3226782A (en) * 1963-03-01 1966-01-04 United States Steel Corp Variable-taper casting mold
JPS5216449B2 (fr) * 1972-08-14 1977-05-10

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012207786A1 (de) 2012-05-10 2013-11-14 Sms Siemag Ag Stranggießkokille
DE102012207786B4 (de) 2012-05-10 2025-01-02 Sms Group Gmbh Stranggießkokille

Also Published As

Publication number Publication date
CH664915A5 (de) 1988-04-15
DE3563822D1 (en) 1988-08-25
JPS61103649A (ja) 1986-05-22
ATE35785T1 (de) 1988-08-15
EP0179364A2 (fr) 1986-04-30
EP0179364A3 (en) 1987-04-01

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