EP0179364A2 - 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
EP0179364A2
EP0179364A2 EP85112893A EP85112893A EP0179364A2 EP 0179364 A2 EP0179364 A2 EP 0179364A2 EP 85112893 A EP85112893 A EP 85112893A EP 85112893 A EP85112893 A EP 85112893A EP 0179364 A2 EP0179364 A2 EP 0179364A2
Authority
EP
European Patent Office
Prior art keywords
mold
strand
edge
angle
continuous
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
EP85112893A
Other languages
German (de)
English (en)
Other versions
EP0179364A3 (en
EP0179364B1 (fr
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 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 described shortcomings and disadvantages of 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 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 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 section on the pouring side and to a lesser extent along the section on the exit side.
  • 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 such molds is additionally - proposed to start in the bath level with an edge angle of 90 0, which then gradually decreases in direction of strand travel.
  • 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.
  • FIG. 1 in the case of a plate mold 2, 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 boundary 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 have guided the strand crust 20 on their 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 for 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 region 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 angle reduction is adapted to the dwell time of the strand crust in the mold, ie the average pull-out speed. Furthermore, the steel composition,
  • edge angle decreasing at substantially right rectangular steel strands are between 0.2 0 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, wear phenomena 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 angle 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 represents a variant of a roof shape which, together with a broad side on the outlet-side section 55, would result in a constant edge angle.
  • the angle reduction extends 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.
  • 10 shows an example in which an angle 92 on the pouring side of the mold is greater than 90 ° and an angle 90 on the outlet side of the mold is 90 °.
  • 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 mold 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
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 true EP0179364A2 (fr) 1986-04-30
EP0179364A3 EP0179364A3 (en) 1987-04-01
EP0179364B1 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 (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4955428A (en) * 1986-08-18 1990-09-11 Mannesmann Ag Device for continuous casting of slabs
US5082746A (en) * 1990-04-20 1992-01-21 Forward Gordon E As-continuously cast beam blank and method for casting continuously cast beam blank
US5191924A (en) * 1989-07-19 1993-03-09 Sollac Built-up ingot mold for the continuous casting of metal
US5360053A (en) * 1991-02-06 1994-11-01 Concast Standard Ag Continuous casting mold for steel
WO1996033034A1 (fr) * 1995-04-18 1996-10-24 Voest-Alpine Industrieanlagenbau Gmbh Coquille de coulee continue
US6270590B1 (en) 1995-08-03 2001-08-07 Europa Metalli S.P.A. Low lead release plumbing components made of copper based alloys containing lead, and a method for obtaining the same
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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101360564B1 (ko) * 2011-12-27 2014-02-24 주식회사 포스코 연속주조 주형
DE102012207786A1 (de) 2012-05-10 2013-11-14 Sms Siemag Ag Stranggießkokille

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1293958B (de) * 1963-03-01 1969-04-30 United States Steel Corp Stranggiesskokille mit polygonalem Querschnitt
DE2340768C3 (de) * 1972-08-14 1975-07-24 Concast Ag, Zuerich (Schweiz) Regelvorrichtung für die automatische Verstellung einer Stranggießkokille

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1293958B (de) * 1963-03-01 1969-04-30 United States Steel Corp Stranggiesskokille mit polygonalem Querschnitt
DE2340768C3 (de) * 1972-08-14 1975-07-24 Concast Ag, Zuerich (Schweiz) Regelvorrichtung für die automatische Verstellung einer Stranggießkokille

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4955428A (en) * 1986-08-18 1990-09-11 Mannesmann Ag Device for continuous casting of slabs
US5191924A (en) * 1989-07-19 1993-03-09 Sollac Built-up ingot mold for the continuous casting of 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
US5360053A (en) * 1991-02-06 1994-11-01 Concast Standard Ag Continuous casting mold for steel
WO1996033034A1 (fr) * 1995-04-18 1996-10-24 Voest-Alpine Industrieanlagenbau Gmbh Coquille de coulee continue
US5799719A (en) * 1995-04-18 1998-09-01 Voest-Alpine Industrieanlagenbau Gmbh Continuous casting mold
CN1081498C (zh) * 1995-04-18 2002-03-27 奥地利钢铁联合企业阿尔帕工业设备制造公司 连续铸锭结晶器
US6270590B1 (en) 1995-08-03 2001-08-07 Europa Metalli S.P.A. Low lead release plumbing components made of copper based alloys containing lead, and a method for obtaining the same
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
US6770215B2 (en) 1997-11-19 2004-08-03 Europa Metalli S.P.A. Low lead release plumbing components made of copper based alloys containing lead, and a method for obtaining the same

Also Published As

Publication number Publication date
DE3563822D1 (en) 1988-08-25
EP0179364A3 (en) 1987-04-01
JPS61103649A (ja) 1986-05-22
CH664915A5 (de) 1988-04-15
EP0179364B1 (fr) 1988-07-20
ATE35785T1 (de) 1988-08-15

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