EP0627968B1 - Verfahren zum stranggiessen von metal, insbesondere von stahl in knüppel- und vorblockquerschnitte - Google Patents

Verfahren zum stranggiessen von metal, insbesondere von stahl in knüppel- und vorblockquerschnitte Download PDF

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Publication number
EP0627968B1
EP0627968B1 EP93903980A EP93903980A EP0627968B1 EP 0627968 B1 EP0627968 B1 EP 0627968B1 EP 93903980 A EP93903980 A EP 93903980A EP 93903980 A EP93903980 A EP 93903980A EP 0627968 B1 EP0627968 B1 EP 0627968B1
Authority
EP
European Patent Office
Prior art keywords
strand
casting
mould
reforming
process according
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 - Lifetime
Application number
EP93903980A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0627968A1 (de
Inventor
Franciszek Kawa
Adrian Stilli
Adalbert Roehrig
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 Standard AG
Original Assignee
Concast Standard 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
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Application filed by Concast Standard AG filed Critical Concast Standard AG
Publication of EP0627968A1 publication Critical patent/EP0627968A1/de
Application granted granted Critical
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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
    • 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
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting

Definitions

  • the invention relates to a method for the continuous casting of metal, in particular steel, according to the features of the preamble of claim 1.
  • molds for the continuous casting of steel strands with polygonal, in particular with square, cross sections are known.
  • the cross section of a mold cavity open on both sides is a square with corner fillets on the pouring side and an irregular pentagon on the strand exit side.
  • corner fillet becomes the pouring cone is continuously enlarged in the direction of the strand, and is approximately twice as large in the area of the fillet over a partial length of the mold as in the central region of the mold wall.
  • jamming of the strand inside the mold can occur, which leads to strand breaks and breakthroughs.
  • a twelve-corner is cast instead of a square.
  • the invention has for its object to overcome the disadvantages mentioned.
  • the casting process according to the invention is intended to achieve improved cooling of the strand crust in the mold, improved strand quality and increased casting performance.
  • the new casting process is to be optimized for operational operations that occur in practice, such as starting, changing the pouring tube, changing the receptacle, changing the ladle, pouring end, faults, etc., thereby further improving both the strand quality and the mold durability.
  • the casting method according to the invention it is possible to force cooling in the case of billets and pre-block cross sections to be uniform in all circumferential sections and dimensionable in terms of their intensity within predetermined limits. This can influence the crystallization of the strand crust, increase the casting performance and improve the strand quality. Skewed edges, surface and structural defects are avoidable. Due to the ongoing adaptation of the deformation length of the strand crust within the mold during the casting operation, the method according to the invention can also Process the uniformity of the cooling can be improved even with different casting parameters. Quality defects on the strand and the risk of strand breaks and breakthroughs can be significantly reduced in the case of strongly changing casting parameters. The life of the mold can also be extended.
  • the extent of the total recovery of the bulge is determined by the arc height of the bulge, by the angle that forms the conicity of the bulge, and by the bath level height within the partial length.
  • the reshaping is usually proportional to the partial height of the bath level within the partial length. Instead of a constant taper of the bulge, it can also be chosen to be degressive, progressive, etc.
  • the degree of reshaping of the bulge during the casting is usually specified in mm.
  • the degree of reshaping of the bulge can be determined in such a way that a friction value optimized for the existing casting parameters is maintained.
  • a measurement of the pull-out force on the driver can also be used as a parameter.
  • the degree of reshaping of the bulge can be determined by ongoing measurements of casting parameters or by mathematical models that take into account the steel analysis, the overheating and casting temperature, the selected casting speed, the type of lubricant and / or the heat flow in the mold.
  • reshaping can be switched off if the bath level before the standstill reaches the lower end of the partial length of the mold or is lower.
  • the strand cross-section is reduced by a small amount due to the shrinkage of the strand crust.
  • a deliberate deformation does not take place.
  • the reshaping of the bulge between the casting level and the end of the partial length results in an additional reduction in the strand cross section, the order of magnitude being between 4% and 15%, preferably between 6% and 10%.
  • the uncontrolled lifting of the strand crust in the prior art chill molds has made the lengthening of billet and pre-block chill molds appear to be of little use.
  • the controlled reshaping of bulges combined with a large area for setting the target bath level, makes it useful for the first time that, according to a further exemplary embodiment, the strand forming in the mold, depending on the casting parameters, via a variable primary cooling section, e.g. between 500 and 1000 mm, is cooled.
  • the deformation of the bulge of the strand crust is adjusted to a length that is up to 40% of the mold length.
  • a mold 3 for the continuous casting of polygonal strand cross sections, in the present example of a square strand cross section, is shown.
  • An arrow 4 points to a pouring side and an arrow 5 to a strand exit side of the mold 3.
  • the cross sections of a mold cavity 6 have different geometrical shapes on the pouring and strand exit side.
  • the cross section of the mold cavity 6 on the pouring side 4 between the corners 8 - 8 ′′ ′′ is provided with cross sectional enlargements in the form of bulges 9.
  • An arc height 10 which represents the size of the bulge, decreases continuously in the direction of the strand 11 over a partial length 12 of the mold cavity 6.
  • the mold cavity cross sections in the planes 14 and 15 delimit a mold part 13 with a square cross section with fillets 16, as is known in the prior art.
  • a circumferential line 17 shows the mold cavity cross section in the plane 14 and a circumferential line 18 shows the mold cavity cross section in the plane 15.
  • the cross section of the mold cavity 6 is straight on all sides between the corners 8 on the mold exit side.
  • An arrow 2 denotes a peripheral section of the peripheral lines of the mold cavity 6.
  • circumferential sections with similar cross-sectional enlargements 7 are provided.
  • a hexagonal, rectangular, approximately round, etc. cross section could also serve as the basic shape.
  • a light dimension 20 between opposite sides of the mold cavity 6 on the pouring side 4 in the area of the largest bulge is 5 to 15% larger than a light dimension 21 between the opposite sides on the strand exit side 5.
  • the light dimension 20 can be at least 8% larger than the light dimension 21 in the plane 15 at the end of the partial length 12.
  • the arch height 10 of the bulge 9 decreases continuously in the direction of the strand 11 with the following cross sections.
  • the taper of the maximum arch height 10 along a line 24 can be selected from 8 to 35% / m.
  • the part length 12 in this example is 400 mm or about 40% of the mold length, which measures about 1000 mm.
  • the 40 schematically shows a computer to which the information 41-45 is supplied, 41 representing the steel analysis, 42 the superheating temperature, 43 the casting temperature in the intermediate vessel, 44 the mold and lubricant parameters and 45 the continuously measured friction value between the mold and the strand.
  • the computer 40 calculates the bath level, which determines the extent of the reshaping, for the various operating states, such as casting, full load casting, casting interruption, pouring end, etc., and then uses the stopper or slide control 47 to correspondingly determine the metal flow into the mold and the strand withdrawal speed 48 controlled to bring the bath level to the desired height within the mold.
  • Fig. 3 shows how the degree of reshaping is measured.
  • the sloping inner contour 30 of the bulge 32 along the bulge center ends in the plane 31. In the strand running direction, the bulge runs in a straight line in this vertical section. However, it could also be limited by a degressive or S-shaped curve etc.
  • the degree of the reshaping of the bulge corresponds to the length of the arrow 36. If the extent of the reshaping should be zero when the machine is at a standstill, the bath level is lowered to the end point 38 of the partial length 39 or below.
  • the method according to the invention is characterized by the following method steps.
  • the parameters 44 of the mold used and of the cast metal 41-43 are entered into the computer.
  • the computer takes the friction values optimized for these parameters at different casting speeds with the associated bath level heights for starting up, for full load operation, for reduced casting operation and for ending the casting.
  • the superheating and casting temperature of the casting metal is entered into the computer as a correction factor for each measurement.
  • the measured friction values 45 are continuously compared with the optimized friction values that are assigned to each casting operation.
  • the degree of reshaping of the bulge is increased or decreased by specifying a higher or lower bath level in the area of the partial length.
  • the friction measurement of the strand in the mold is given priority over the other casting parameters.
  • the strand extraction force can also be selected as the reference variable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Metal Rolling (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
EP93903980A 1992-03-05 1993-02-17 Verfahren zum stranggiessen von metal, insbesondere von stahl in knüppel- und vorblockquerschnitte Expired - Lifetime EP0627968B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH690/92 1992-03-05
CH69092 1992-03-05
PCT/EP1993/000372 WO1993017817A1 (de) 1992-03-05 1993-02-17 Verfahren zum stranggiessen von metal, insbesondere von stahl in knüppel- und vorblockquerschnitte

Publications (2)

Publication Number Publication Date
EP0627968A1 EP0627968A1 (de) 1994-12-14
EP0627968B1 true EP0627968B1 (de) 1995-11-02

Family

ID=4192890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93903980A Expired - Lifetime EP0627968B1 (de) 1992-03-05 1993-02-17 Verfahren zum stranggiessen von metal, insbesondere von stahl in knüppel- und vorblockquerschnitte

Country Status (20)

Country Link
US (1) US5469910A (cs)
EP (1) EP0627968B1 (cs)
JP (1) JP2683157B2 (cs)
KR (2) KR970008034B1 (cs)
CN (1) CN1054558C (cs)
AT (1) ATE129654T1 (cs)
AU (1) AU659287B2 (cs)
BR (1) BR9306021A (cs)
CA (1) CA2129964C (cs)
CZ (1) CZ292822B6 (cs)
DE (1) DE59300864D1 (cs)
DK (1) DK0627968T3 (cs)
ES (1) ES2082631T3 (cs)
FI (1) FI100316B (cs)
GE (1) GEP19991523B (cs)
GR (1) GR3018150T3 (cs)
MX (1) MX9301186A (cs)
TR (1) TR28425A (cs)
WO (1) WO1993017817A1 (cs)
ZA (1) ZA931284B (cs)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0958871A1 (de) * 1998-05-18 1999-11-24 Concast Standard Ag Kokille zum Stranggiessen von im wesentlichen polygonalen Strängen.
RU2414322C2 (ru) * 2005-11-30 2011-03-20 Км Ойропа Метал Акциенгезелльшафт Кристаллизатор для непрерывной разливки металла

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1267244B1 (it) * 1994-05-30 1997-01-28 Danieli Off Mecc Procedimento di colata continua per acciai ad alto contenuto di carbonio
AT404235B (de) * 1995-04-18 1998-09-25 Voest Alpine Ind Anlagen Stranggiesskokille
EP0842332B1 (en) 1995-08-03 2001-05-23 EUROPA METALLI S.p.A. Low lead release plumbing components made of copper based alloys containing lead, and a method for obtaining the same
WO1998009750A1 (en) * 1996-09-03 1998-03-12 Ag Industries, Inc. Improved mold surface for continuous casting and process for making
EP0875312A1 (en) * 1997-05-02 1998-11-04 Kvaerner Metals Continuous Casting Limited Improvements in and relating to casting
ES2152132B1 (es) * 1997-07-31 2001-07-01 Sidenor Investigacion Y Desarr "lingotera perfeccionada y lingote obtenido con la misma".
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
US7493936B2 (en) * 2005-11-30 2009-02-24 Kobe Steel, Ltd. Continuous casting method
EP2025432B2 (de) * 2007-07-27 2017-08-30 Concast Ag Verfahren zur Erzeugung von Stahl-Langprodukten durch Stranggiessen und Walzen
RU2431540C1 (ru) * 2010-06-11 2011-10-20 Владимир Павлович Середкин Гильза кристаллизатора для непрерывного литья круглых заготовок
CN104923755B (zh) * 2015-06-08 2017-01-04 西安理工大学 消除扁形球墨铸铁型材鼓肚缺陷的反弧度法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207941A (en) * 1975-06-16 1980-06-17 Shrum Lorne R Method of continuous casting of metal in a tapered mold and mold per se
CH617608A5 (cs) * 1977-04-06 1980-06-13 Concast Ag
DE3400220A1 (de) * 1984-01-05 1985-07-18 SMS Schloemann-Siemag AG, 4000 Düsseldorf Kokille zum stranggiessen von stahlband
AT379093B (de) * 1984-02-16 1985-11-11 Voest Alpine Ag Durchlaufkokille fuer eine stranggiessanlage
US4774995A (en) * 1986-06-11 1988-10-04 Sms Concast Inc. Continuous casting mold
ES2056670T5 (es) * 1991-02-06 2001-02-01 Concast Standard Ag Lingotera para la colada continua de metales, particularmente de acero.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0958871A1 (de) * 1998-05-18 1999-11-24 Concast Standard Ag Kokille zum Stranggiessen von im wesentlichen polygonalen Strängen.
RU2414322C2 (ru) * 2005-11-30 2011-03-20 Км Ойропа Метал Акциенгезелльшафт Кристаллизатор для непрерывной разливки металла

Also Published As

Publication number Publication date
AU3497593A (en) 1993-10-05
CZ292822B6 (cs) 2003-12-17
KR950700138A (ko) 1995-01-16
JPH07503410A (ja) 1995-04-13
US5469910A (en) 1995-11-28
GEP19991523B (en) 1999-03-05
GR3018150T3 (en) 1996-02-29
JP2683157B2 (ja) 1997-11-26
CA2129964C (en) 2000-04-11
EP0627968A1 (de) 1994-12-14
BR9306021A (pt) 1997-11-18
KR970008034B1 (ko) 1997-05-20
CN1054558C (zh) 2000-07-19
DE59300864D1 (de) 1995-12-07
DK0627968T3 (da) 1996-01-08
FI944030L (fi) 1994-09-02
CN1076147A (zh) 1993-09-15
AU659287B2 (en) 1995-05-11
MX9301186A (es) 1994-07-29
ATE129654T1 (de) 1995-11-15
ZA931284B (en) 1993-09-17
FI944030A0 (fi) 1994-09-02
CA2129964A1 (en) 1993-09-16
WO1993017817A1 (de) 1993-09-16
CZ213994A3 (en) 1996-05-15
TR28425A (tr) 1996-06-14
FI100316B (fi) 1997-11-14
ES2082631T3 (es) 1996-03-16

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