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WO1996035533A1 - Moule de coulee en continu - Google Patents

Moule de coulee en continu Download PDF

Info

Publication number
WO1996035533A1
WO1996035533A1 PCT/SE1996/000598 SE9600598W WO9635533A1 WO 1996035533 A1 WO1996035533 A1 WO 1996035533A1 SE 9600598 W SE9600598 W SE 9600598W WO 9635533 A1 WO9635533 A1 WO 9635533A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould
inlet side
radius
main inner
continuous casting
Prior art date
Application number
PCT/SE1996/000598
Other languages
English (en)
Inventor
Bo Rogberg
Bengt Brolund
Staffan Hertzman
Original Assignee
Sandvik Aktiebolag
Institutet För Metallforskning
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 Sandvik Aktiebolag, Institutet För Metallforskning filed Critical Sandvik Aktiebolag
Priority to AU57092/96A priority Critical patent/AU5709296A/en
Priority to JP8533996A priority patent/JPH11504864A/ja
Priority to BR9608283A priority patent/BR9608283A/pt
Publication of WO1996035533A1 publication Critical patent/WO1996035533A1/fr

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
    • 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

Definitions

  • the invention relates to a mould for continuous casting of metals, preferably steel, according to claim 1. Since the beginning of continuous casting with through- flow moulds, professional circles have dealt with problems relating to the creation of air gaps between the strand shell and the mould wall below the surface of the molten metal.Of course, this gap formation deteriorates the heat transfer between the mould and the strand shell considerably and causes an uneven cooling of the strand, which results in deficiencies in the billet, such as rhombic shape, cracks, structural defects, etc.
  • US-A-4 207 941 describes a mould for the continuous casting of steel strands with polygonal, in particular square cross-sections.
  • the cross-section of the mould cavity that is open at both sides, is at the inlet side a square with corner fillets and at the outlet side an irregular dodecagon.
  • a jamming of the strand may easily arise, which may lead to a tearing up of the strand and a break ⁇ through.
  • a dodecagon is moulded instead of a square. It is particularly difficult to dimension such moulds for different moulding speeds during a continuous moulding, which is necessary at long sequential mouldings with many changes of ladles.
  • DE-A-3 907 351 a mould for continuous casting of a bloom is described. The two longitudinal sides are provided with
  • CONFIRMATION PY bulges at the inlet side of the mould, which are continuously retrograded along a part height of the mould.
  • the cross-section of the mould cavity is right- angled and provided with the desired bloom cross-section.
  • the only purpose of the two bulges facing each other is to provide sufficient place for a moulding pipe. There are no bulges on the two narrow sides and also no shaping of the strand shell by means of the mould walls.
  • AT-B-379 093 describes a mould for the continuous casting of a bloom.
  • the circumference line of the cross-section of the mould cavity at the inlet side can be divided into four circumference sections.
  • At two circumference sections at the inlet side, which simultaneously form the longitudinal sides of the bloom section, are provided cross-sectional enlargements with the shape of protruding bulges in relation with the same cross-section at the outlet side of the strand.
  • the measure of the bulge which in this case corresponds to the arch height, diminishes continuously in the moving direction of the strand and is nil at the exit of the mould.
  • the construction shall also make possible differences in the moulding rate during the process of casting.
  • EP-A-498 296 has only partly managed to fulfil the posed problems.
  • the reduction of the cross-sectional area has sometimes turned out to be too big, which has caused problems of jamming of the cast strand and of an increased mould wear.
  • the chosen casting rate has turned out to be too high for this mould. It has been constructed in first hand for high rates, not for freedom from cracks and a generally faultless casting. However, it does not fully compensate for corner shrinkage, wherefore the corner design leaves more to be desired.
  • the strand binds or "pinches" at lower casting rates.
  • a primary object of the present invention is to compensate for the corner shrinkage of the strand, both at higher and lower casting rates.
  • a further object of the present invention is to simplify the design of the mould as much as possible.
  • Still another object of the present invention is to obtain an optimal contact between the strand and the mould wall along the whole length of the mould.
  • a further object of the present invention is to compensate for the shrinkage gradient that arises between the inlet and outlet of the mould, thereby minimizing pull and pressure stresses.
  • the mould has been given a shape that corresponds to the solidification behaviour of the material. This results in a better contact and thus a better support for the strand shell, and thereby an almost tension-free shell.
  • the casting of crack-sensitive sorts is simplified and the risk of corner cracks in the corner regions, such as cross cracks, corner cracks and impressions is minimized.
  • the risk of a rhombic* strand-shape is decreased, a problem that often arises, e.g., when casting blooms and billets.
  • the construction according to the invention exposes the shell to a minimum of external influence and causes a very small mould wear (contrary to, e.g., AT-A-379 093), by the fact that the mould has a shape that substantially follows the free dimension variations of the strand during casting.
  • Figure 1 shows a mould according to the invention in a perspective obliquely from above.
  • Figure 2 shows a formalized view straight from above of two moulds according to the invention.
  • Reference numeral 2 designates the inlet side of the mould and 3 designates its outlet side. Between these extends the mould cavity 4. It is suitably made of one sole, straight piece, although bowed moulds and block or plate moulds are also feasible.
  • the mould is shaped with inner walls 5 which bulge inwards, towards the middle of the mould. At the top, at the inlet side 2 of the mould, they have a bending radius R ref , which within given ranges increases indefinitely towards the outlet side 3 of the mould.
  • R' is the dimensionless radius
  • R is the radius at the height z
  • R ref is the radius at the inlet side (see fig 1)
  • z' is the dimensionless distance from the upper side of the mould
  • z is the factual distance from the upper side of the mould
  • L is the total height of the mould.
  • R(z) LR ref /(L-z) , or
  • R(z) LR ref /(L-z) ; or dimensionless:
  • the dimensionless radius shall suitably be within the following ranges along the vertical axis of the mould:
  • the dimensionless radius lies within the following ranges:
  • the mould shape goes from bulging sides and corner angles ⁇ larger than 90° at the inlet side, to a substantially square or rectangular shape at the bottom side of the mould.
  • the corner angles ⁇ decrease downwards in a determined way, in order to obtain further advantages with regard to a minimized formation of cracks, increased casting rate and optimized heat transfer between the strand and the mould.
  • the angle alteration should suitably be between 2 and 8°, preferably between 2 and 4°.
  • fig 2 shows the cross-sectional shape of the mould cavity 4 at the inlet side 2 and the outlet end 3, respectively, of the mould.
  • the cross-section of the inlet side corresponds to line 6 while the cross-section of the outlet end is substantially rectangular and is depicted either by the rectangle 7 or 8.
  • the corner distance of the mould in one direction may be lar,ger at the lower edge of the mould than at the upper edge, i.e. the mould may to some extent obtain an inverted conicity.
  • the mould should have some conicity in order to compensate for the cooling shrinkage of the arising strand shell, and whose reduction of the corner distance may be added to the extension of the corner distance that occurs when the bulging side surface 5 is gradually straightened out.
  • the bulginess of the mould walls start 5 to 40 mm from the corners 9, as measured along the substantially planar wall portion 10; preferably 10 to 30 mm.

Landscapes

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

Abstract

L'invention concerne un moule pour le coulage en continu d'acier de préférence. Ce moule présente un côté d'admission (2) et un côté d'évacuation (3) entre lesquels se trouve une cavité de moule (4). Dans la partie supérieure, les quatre parois intérieures principales dans la cavité du moule sont bombées vers l'intérieur en direction du centre du moule, puis ce renflement décroît vers le bas en direction du côté d'évacuation du moule. Il est ainsi possible de donner au moule une forme correspondant au comportement de l'acier lors de la solidification, ce qui permet d'obtenir un contact et un support améliorés pour la surface extérieure de la barre.
PCT/SE1996/000598 1995-05-09 1996-05-07 Moule de coulee en continu WO1996035533A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU57092/96A AU5709296A (en) 1995-05-09 1996-05-07 Mould for continuous casting
JP8533996A JPH11504864A (ja) 1995-05-09 1996-05-07 連続鋳造用の金型
BR9608283A BR9608283A (pt) 1995-05-09 1996-05-07 Molde para fundição contínua

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9501709A SE516076C2 (sv) 1995-05-09 1995-05-09 Kokill för stränggjutning
SE9501709-1 1995-05-09

Publications (1)

Publication Number Publication Date
WO1996035533A1 true WO1996035533A1 (fr) 1996-11-14

Family

ID=20398240

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/000598 WO1996035533A1 (fr) 1995-05-09 1996-05-07 Moule de coulee en continu

Country Status (7)

Country Link
JP (1) JPH11504864A (fr)
KR (1) KR19990008455A (fr)
AU (1) AU5709296A (fr)
BR (1) BR9608283A (fr)
CA (1) CA2219910A1 (fr)
SE (1) SE516076C2 (fr)
WO (1) WO1996035533A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0875312A1 (fr) * 1997-05-02 1998-11-04 Kvaerner Metals Continuous Casting Limited Améliorations liées à et concernant la coulée
GB2329141A (en) * 1997-09-12 1999-03-17 Kvaerner Metals Cont Casting Continuous casting
EP0958871A1 (fr) * 1998-05-18 1999-11-24 Concast Standard Ag Lingotière pour la coulée continue des barres substantiellement polygonale
WO2003092930A3 (fr) * 2002-04-27 2004-02-19 Sms Demag Ag Coquille de coulee continue pour metaux liquides, en particulier pour acier liquide
WO2011023483A1 (fr) * 2009-08-04 2011-03-03 Siemens Vai Metals Technologies S.R.L. 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
CN113857444A (zh) * 2021-10-10 2021-12-31 秦皇岛瀚丰长白结晶器有限责任公司 一种适合生产普碳钢的高拉速结晶器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1028300B (de) * 1956-11-12 1958-04-17 Olsson Erik Allan Kokille zum kontinuierlichen Giessen
DE1508802A1 (de) * 1965-07-08 1969-11-06 Tsnii Tchneroy Metallourgiy I Kokille fuer den kontinuierlichen Guss von Halbzeug mit starkem Querschnitt
US3910342A (en) * 1973-11-12 1975-10-07 Rossi Irving Molds for continuous casting
DE4138642C2 (fr) * 1991-11-25 1993-09-02 Sms Schloemann-Siemag Ag, 40237 Duesseldorf, De

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1028300B (de) * 1956-11-12 1958-04-17 Olsson Erik Allan Kokille zum kontinuierlichen Giessen
DE1508802A1 (de) * 1965-07-08 1969-11-06 Tsnii Tchneroy Metallourgiy I Kokille fuer den kontinuierlichen Guss von Halbzeug mit starkem Querschnitt
US3910342A (en) * 1973-11-12 1975-10-07 Rossi Irving Molds for continuous casting
DE4138642C2 (fr) * 1991-11-25 1993-09-02 Sms Schloemann-Siemag Ag, 40237 Duesseldorf, De

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0875312A1 (fr) * 1997-05-02 1998-11-04 Kvaerner Metals Continuous Casting Limited Améliorations liées à et concernant la coulée
GB2329141A (en) * 1997-09-12 1999-03-17 Kvaerner Metals Cont Casting Continuous casting
EP0958871A1 (fr) * 1998-05-18 1999-11-24 Concast Standard Ag Lingotière pour la coulée continue des barres substantiellement polygonale
WO2003092930A3 (fr) * 2002-04-27 2004-02-19 Sms Demag Ag Coquille de coulee continue pour metaux liquides, en particulier pour acier liquide
WO2011023483A1 (fr) * 2009-08-04 2011-03-03 Siemens Vai Metals Technologies S.R.L. 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
EP2292350A1 (fr) * 2009-08-04 2011-03-09 Siemens VAI Metals Technologies S.r.l. 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
CN102470425A (zh) * 2009-08-04 2012-05-23 西门子Vai金属技术有限公司 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
CN113857444A (zh) * 2021-10-10 2021-12-31 秦皇岛瀚丰长白结晶器有限责任公司 一种适合生产普碳钢的高拉速结晶器

Also Published As

Publication number Publication date
AU5709296A (en) 1996-11-29
KR19990008455A (ko) 1999-01-25
JPH11504864A (ja) 1999-05-11
CA2219910A1 (fr) 1996-11-14
SE9501709D0 (sv) 1995-05-09
SE516076C2 (sv) 2001-11-12
BR9608283A (pt) 1999-06-08
SE9501709L (sv) 1996-11-10

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