EP0869853B1 - Verfahren zum stranggiessen von dünnbrammen aus metall - Google Patents

Verfahren zum stranggiessen von dünnbrammen aus metall Download PDF

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Publication number
EP0869853B1
EP0869853B1 EP96946181A EP96946181A EP0869853B1 EP 0869853 B1 EP0869853 B1 EP 0869853B1 EP 96946181 A EP96946181 A EP 96946181A EP 96946181 A EP96946181 A EP 96946181A EP 0869853 B1 EP0869853 B1 EP 0869853B1
Authority
EP
European Patent Office
Prior art keywords
gap
mold
ratio
cross
submerged nozzle
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
EP96946181A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0869853A2 (de
Inventor
Fritz-Peter Pleschiutschnigg
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.)
SMS Siemag AG
Original Assignee
SMS Demag AG
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Filing date
Publication date
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP0869853A2 publication Critical patent/EP0869853A2/de
Application granted granted Critical
Publication of EP0869853B1 publication Critical patent/EP0869853B1/de
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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
    • B22D11/0406—Moulds with special profile

Definitions

  • the invention relates to a method for the continuous casting of thin slabs of metal according to the preamble of claim 1.
  • From DE-A-2015033 is a continuous casting mold for casting thin slabs known, with an elongated inner cross-sectional area, with cooled mold walls and a melt feed via at least one immersed in the melt Diving spout.
  • the US-PS 50 82 746 discloses specially dimensioned profile strands in which specified cross-sectional parameters must not be exceeded and the one have predetermined homogeneous crystal structure to then with a Minimum rolling effort to get the desired cross-sectional profile.
  • profile strands can be made with one or more dipping spouts be poured for melt feed. It has been shown that only the Limitation of the cross-sectional parameters and the specification of a desired one Crystal structure is not sufficient to close the profile strands without cracks and with a homogeneous crystal structure over the entire cross-section. Is too it is not sufficient in the case of an extruded profile with molded ends Flanks to choose the web width equal to the flank width, as in US Pat. No.
  • the cast strands should have a homogeneous crystal structure have the entire cross-section.
  • the invention provides that at least at the level of the pouring level and at least over part of the immersion depth of the immersion nozzle for the ratio of the gap widths S TI in the area of the immediate vicinity of the immersion nozzle and S II / 2 in the areas in which the inner surfaces the mold walls are directly opposite one another, and the following applies to the ratio of the cooling powers L TI and L II of the corresponding areas of the mold wall (1, 2): [P TI / (P II / 2)] / [L TI / L II ]> 1.
  • S TI is the gap width of the gap formed by the outer surface of the respective immersion spout and by the inner surface of the mold wall located directly adjacent.
  • S II / 2 is half the gap width of the gap formed by the inner surfaces, specifically in the areas in which the inner surfaces of the mold walls are directly adjacent to one another, in which no immersion nozzle is therefore arranged between the inner surfaces.
  • L TI and L II are the cooling capacities of the mold wall in the corresponding areas.
  • the continuous casting mold with such an internal cross-section enables it, mold powder lying on the mold level even at high Casting speeds melt evenly and together with the Slag to be removed evenly, resulting in the formation of a molten Slag-casting powder layer of the same height over the entire Internal cross-sectional area leads.
  • a layer of slag and pourable powder of the same height advantageously causes the formation of a during continuous casting even slag-casting powder layer between the mold wall and Strand surface. This allows the strand shell to slide very well on the adjust the entire mold wall and the heat of the melt or strand dissipate very evenly over the mold walls during pouring, thereby a strand shell with a very homogeneous crystal structure and without tension and forms cracks.
  • [S TI / (S II / 2)] / [L TI / L II ] over the entire immersion depth of the immersion nozzle is between 1.05 and 1.30, which means in particular the influence of the immersion nozzle wall on the heat conditions in the mold during the Casting is taken into account.
  • the dimensioning of the required internal cross section of the continuous casting mold can be simplified to the effect that [S TI / (S II / 2)]> 1, preferably [S TI / (S II / 2)] is between 1.05 and 1.30, which in turn takes into account in particular the influence of the immersion spout on the heat conditions in the mold during casting.
  • the immersion nozzle has an elongated cross section having.
  • the areas of the Broad sides are shaped relatively little to the outside.
  • the invention proposes, in particular for generating a Cross section with thickened ends (dog bone), two immersion spouts each To arrange the area of the narrow sides.
  • the immersion spouts for example, a have a substantially triangular cross section.
  • Cooling elements for example cooling tubes, are used to cool the mold walls are distributed over the mold walls per unit area so that in the corresponding range provided cooling performance is achieved.
  • Fig. 1 shows a cross section through a continuous casting mold with an elongated Internal cross-sectional area at the level of the mold level that arises during operation for casting strands.
  • the broad side mold walls 1,1 and Narrow side mold walls 2,2 are opposite each other (1-1; 2-2) arranged to form a casting room, preferably consist of copper and are provided with cooling tubes 3 to dissipate the heat.
  • the cooling pipes 3 provide thereby for a uniform heat dissipation through the mold walls 1,2 by pro Surface unit a corresponding number of cooling tubes 3 in the mold wall 1,2 is provided.
  • Fig. 1 shows that in the immediate vicinity of the immersion nozzle 4, the broad side mold walls 1, 1 are each curved outwards, in such a way that the gap 7 formed by the broad side mold walls 1, 1 and the immersion nozzle 4 has a substantially constant gap width S TI over the entire immersion depth.
  • this is achieved in that the outer surfaces 6 of the immersion spout 4 have a contour similar to that of the directly opposite inner surfaces 5 of the wide mold side walls 1. Due to the elongated shape of the immersion spout 4, the regions of the broad sides 1 opposite the immersion spout 4 have to be shaped relatively little to the outside.
  • FIG. 2 A further variant of a continuous casting mold with an internal cross-sectional area dimensioned according to the invention is shown in FIG. 2.
  • the continuous casting mold shown in FIG. also known as dog bone cross-section).
  • the outer cross section of the immersion spout 4 can be of almost any shape; in the exemplary embodiment according to FIG. 2, the immersion spout 4 has an essentially triangular outer cross section.
  • the gap 7 formed by the outer surface 6 of the immersion spout 4 and the directly opposite inner surface 5 of the mold wall is dimensioned over the entire immersion depth such that the gap width S TI is essentially constant.
  • an essentially constant gap width means that in smaller, areas, d. H. for example at the corners of the triangular Cross-section of the immersion spout 4, deviations from the required constancy the gap width can occur; the constancy of the gap width must be in this Areas should therefore only be approximately met, but should double the value do not exceed.
  • the flanks - as in the left half of FIG. 1 it can be seen that something is formed on the outside.
  • the gap width can be reduced or enlarged in both exemplary embodiments if the cooling capacity of the mold wide side wall 1 is smaller or larger in the corresponding areas in the area of the gap 7. It is crucial that the ratio of gap width (S TI or S II / 2) and cooling capacity (L TI or L II ) of the corresponding area of the mold wall 1 is constant at every point of the continuous casting mold and preferably in the range between 1.05 and 1 , 30 lies. In the exemplary embodiments, this value is 1.05.
  • the or the Submersible spouts 4 When operating the continuous casting mold according to FIG. 1 or FIG. 2, the or the Submersible spouts 4 continuously poured molten steel into the mold and the cast one Profile strand pulled off at a constant speed. While pouring with constant take-off speed is always exactly as much steel melt fed, as is withdrawn at the mold exit, reducing the amount of the setting pouring level is constant with constant renewal of itself in this Melting steel area, which additionally melts the supplied and on the mold level mold powder. Doing so the essentially constant gap width in the exemplary embodiments according to FIG. 1 and Fig. 2 for a uniform upward heat flow in all Cross-sectional areas of the continuous casting mold, so that in the area of the casting level uniform melting of the mold powder takes place, i.e.
  • Per Casting surface unit and time unit is constantly the same amount Melted casting powder. It also turns out to be constant Pull-off speed of the cast profile strand the slag-casting powder layer that forms in the casting area due to the invention
  • the internal cross-sectional shape is the same at every point on the internal cross-sectional area Height. Associated with this is a self-adjusting slag casting powder film constant thickness between the mold wall 1,2 and the melt or strand shell at all points on the strand surface.
  • the total thermal resistance results from the sum of the individual Partial thermal resistances in which the specific thermal conductivities of the successive layers (mold wall - slag / casting powder - Strand shell - melt - immersion pouring wall) with their reciprocal value.
  • the specific thermal conductivity of the slag casting powder film is approx. 1 W / Km and thus determining heat dissipation and thus cooling the strand, as experimental studies have shown.
  • constant thickness of the slag casting powder film which is formed Horizontal heat transfer into the mold over the entire length of the mold Direction evened out. Temperature differences in the border area Strand shell / mold wall are greatly reduced in this way, so that only there are low tensions in the strand shell of the cast strand, which greatly reduces the risk of cracking.
  • the walls of the continuous casting mold also become uniformly lubricated exposed to reduced wear, so that their service life is also clearly elevated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mold Materials And Core Materials (AREA)
  • Silicon Compounds (AREA)
EP96946181A 1995-12-27 1996-12-03 Verfahren zum stranggiessen von dünnbrammen aus metall Expired - Lifetime EP0869853B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19549275A DE19549275C1 (de) 1995-12-27 1995-12-27 Stranggießkokille
DE19549275 1995-12-27
PCT/DE1996/002375 WO1997024196A2 (de) 1995-12-27 1996-12-03 Stranggiesskokille

Publications (2)

Publication Number Publication Date
EP0869853A2 EP0869853A2 (de) 1998-10-14
EP0869853B1 true EP0869853B1 (de) 2001-05-30

Family

ID=7781731

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96946181A Expired - Lifetime EP0869853B1 (de) 1995-12-27 1996-12-03 Verfahren zum stranggiessen von dünnbrammen aus metall

Country Status (11)

Country Link
US (1) US6044898A (ru)
EP (1) EP0869853B1 (ru)
JP (1) JP3244508B2 (ru)
KR (1) KR19990076748A (ru)
AT (1) ATE201622T1 (ru)
AU (1) AU1921097A (ru)
BR (1) BR9612374A (ru)
DE (2) DE19549275C1 (ru)
ES (1) ES2157020T3 (ru)
RU (1) RU2149074C1 (ru)
WO (1) WO1997024196A2 (ru)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19823797A1 (de) * 1998-05-28 1999-12-09 Daimler Chrysler Ag Vorrichtung und Verfahren zum Stranggießen von Werkstücken

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2015033A1 (en) * 1970-03-28 1971-10-07 Demag AG, 4 lOO Duisburg Molten metal feed for continuous casting of sections
DE2034762A1 (en) * 1970-07-14 1972-01-20 Schloemann AG, 4000 Dusseldorf Thin strip continuous casting - with thick length wise extending sections
US5082746A (en) * 1990-04-20 1992-01-21 Forward Gordon E As-continuously cast beam blank and method for casting continuously cast beam blank
DE19710791C2 (de) * 1997-03-17 2000-01-20 Schloemann Siemag Ag Zueinander optimierte Formen der Stranggießkokille und des Tauchausgusses zum Gießen von Brammen aus Stahl

Also Published As

Publication number Publication date
WO1997024196A3 (de) 1997-09-12
ATE201622T1 (de) 2001-06-15
JP3244508B2 (ja) 2002-01-07
ES2157020T3 (es) 2001-08-01
DE19549275C1 (de) 1997-04-30
BR9612374A (pt) 1999-07-13
AU1921097A (en) 1997-07-28
WO1997024196A2 (de) 1997-07-10
DE59607019D1 (de) 2001-07-05
KR19990076748A (ko) 1999-10-15
JP2000502953A (ja) 2000-03-14
EP0869853A2 (de) 1998-10-14
US6044898A (en) 2000-04-04
RU2149074C1 (ru) 2000-05-20

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