EP1286799A1 - Method for the production of a continuously-cast precursor - Google Patents
Method for the production of a continuously-cast precursorInfo
- Publication number
- EP1286799A1 EP1286799A1 EP01933740A EP01933740A EP1286799A1 EP 1286799 A1 EP1286799 A1 EP 1286799A1 EP 01933740 A EP01933740 A EP 01933740A EP 01933740 A EP01933740 A EP 01933740A EP 1286799 A1 EP1286799 A1 EP 1286799A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mold
- immersion
- width
- spout
- product
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
-
- 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
- B22D11/10—Supplying or treating molten metal
Definitions
- melt preferably steel melt
- a dip spout which is suitable for use in the continuous casting of slabs and in which the melt exits directed below the bath level through outlet openings located laterally opposite one another to the narrow side walls of the mold.
- An essential feature of this immersion nozzle is its constant outer wall distance from the strand shell that forms along the broad side wall.
- this immersion nozzle is suitable for a width-thickness ratio of the cast strand or the mold cross section of a maximum of 8. In the case of larger width-thickness ratios, however, this immersion nozzle does not guarantee a mold flow that creates uniform solidification conditions.
- FIG. 1 This unfavorable formation of the flow conditions is shown in FIG. 1 using a flow thread.
- the exit jet hits the bath surface in the area between the immersion spout and the narrow mold side wall and divides there into two partial jets. This phenomenon leads to uneven melting of the casting powder on the bath surface and to a local impairment of the sliding behavior between Strand and mold wall.
- the object of the invention is therefore to avoid the disadvantages described and to propose a method for producing a continuously cast preliminary product, as well as the continuous casting installation required for this, and an immersion spout for use in this continuous casting installation, even in the case of large casting widths, uniform solidification conditions for the strand and uniform melting and distribution conditions for the mold powder are ensured. Furthermore, a defined swirl system in the mold should be created by a defined steel supply through the immersion spout, which is formed by two large and round upward swirls. Furthermore, it is an object of the invention to not allow any strong lateral deflection of the exit jets, in particular to avoid premature reefing of the exit jet onto the bathroom mirror.
- This object is achieved according to the invention by a method which is characterized in that the melt leaves the immersion spout through mutually opposite outlet openings with movement impulse directed towards the narrow side walls of the mold and for a certain width-thickness ratio of the preliminary product as a function of the ratio of the speed of the Melt in the core cross-section of the immersion nozzle (v k ) to the pouring speed (v c )
- Design values for the width (b) of the immersion tube and the height (h) of the lateral outlet opening of the immersion nozzle are selected so that there is even strand formation in the pouring direction and circumferential direction along the Broad side walls and narrow side walls of the mold.
- ⁇ 0.1.
- B width of the preliminary product (mm)
- D thickness of the preliminary product (mm)
- b width of the immersion nozzle (mm)
- h height of the lateral outlet opening of the immersion nozzle (mm)
- ⁇ ratio (dimensionless)
- Bedingung-values from 0.011 to 0.015 result from the above condition.
- the measures according to the invention further ensure that a system with large pronounced vertebrae can build up.
- the exit jet leaving the immersion nozzle between the two broad sides of the mold must not be slowed down too much.
- the braking effect on the exit jet is determined by wall friction caused by the contact of the moving exit jet with the strand shell. Since the braking friction force increases approximately with the square of the flow velocity, the exit velocity is kept low according to the invention.
- the casting speed v c is preferably set to a value between 0.5 m / min and 1.5 m / min in the proposed preliminary product cross sections.
- a continuous caster according to the invention for producing a continuously cast preliminary product, in particular of wide slabs, with a thickness of the preliminary product D> 100 mm and a width of the preliminary product B 2700 mm to 3500 mm at a casting speed of v c ⁇ 2 m / min, consisting of a
- This is the result of a mold formed by broad side walls and narrow side walls, an immersion spout protruding into the mold on the inlet side and a storage container for the melt, as well as devices on the outlet side of the mold for withdrawing, guiding and cooling the partially solidified liquid core and a solidified strand shell in the mold characterized in that the immersion nozzle contains opposing outlet openings in the operating position oriented towards the narrow side walls of the mold, and that the internal dimensions of the mold at the level of the lateral outlet openings of the immersion nozzle essentially correspond to the dimensions and the width (b) of the immersion nozzle and the height (h) of the lateral outlet opening of the immersion nozzle in relation to one certain width
- ⁇ 0.1.
- a continuous caster of this type is particularly suitable if the primary product is
- Thickness ratio - 15-25, preferably a width-thickness ratio - of D D about 20.
- the inner base of the immersion nozzle is inclined from the immersion nozzle center to the outlet opening in the pouring direction.
- Particularly favorable conditions result if the inclination of the inner bottom of the immersion spout is 10 ° to 20 °, preferably approximately 15 °.
- ⁇ is determined according to the condition ⁇ .
- the inner floor of the immersion spout is inclined from the inner floor center to the outlet opening.
- the inclination of the inner bottom of the immersion nozzle is 10 ° to 20 °, preferably approximately 15 °. This significantly strengthens the tendency to form a swirl-free exit jet. Only two, essentially rectangular, outlet openings are arranged on the immersion spout.
- Fig. 1 shows a schematic representation of the mold flow when using a
- Fig. 2 shows a schematic representation of the mold flow when using a
- FIG. 3 a part of a longitudinal section through the immersion spout according to the invention
- FIG. 3b schematic floor plan with mold and immersion spout along the
- Steel continuous casting plants for the production of wide slabs are generally known, described in the literature and essentially consist of an intermediate vessel for receiving the steel melt, from which the melt is transferred to an oscillating mold via a dip spout.
- a partially rigid cast steel strand is challenged vertically downward from the mold and cooled in a subsequent guide and deflected in a horizontal direction.
- the solidified cast strand is then cut into slabs using a flame cutting machine, which are then sent for further processing.
- the casting of the cast strand takes place in an oscillating continuous casting mold 1 which, as shown schematically in FIG. 3b, is formed by opposite broad side walls 2, 3 and narrow side walls 4, 5 which can be clamped between them, the narrow side walls 4, 5 for setting different strand widths (B) can be moved transversely to the casting direction.
- the inner surfaces of these walls form a format-defining space for the formation of a partially solid cast strand, which is conveyed out of the mold as a product.
- the invention is limited to a method for producing a product with a width B of 2700 to 3500 mm and a thickness D> 100 mm and to a continuous casting plant with a mold which has these cross-sectional dimensions.
- the cast strand does not undergo any significant deformation in the mold itself.
- the melt to be cast is introduced into the continuous casting mold 1 from a storage container, which is not shown, but is notoriously known in such casting plants, via an immersion spout 6 below the bath level 7 formed by the melt in the mold, through lateral outlet openings 8 directed towards the narrow side walls 4, 5 ,
- the melt flows through the immersion nozzle 6 in the vertical direction, which corresponds to the casting direction in the mold, at the speed Vk and becomes in the region of the closed inner bottom 9 of the immersion spout 6 is deflected to the lateral outlet openings 8 and exits through them into the mold space.
- the inner bottom 9 is designed to be inclined in the casting direction in relation to the outlet opening 8.
- the immersion spout thickness (d) is essentially determined by the thickness of the product (D).
- the width (B) and the thickness (D) of the Vo ⁇ roduktes are determined by the production specifications. It follows that the width (b) of the immersion nozzle, the height (h) of the lateral outlet opening of the immersion nozzle and the dimensionless number ⁇ , which are essentially the ratio of the casting speed v c and the speed V k of the liquid steel in the immersion nozzle (Core cross section) describes, are freely selectable.
- the value ⁇ in connection with the immersion nozzle geometry determines the melt speed in the immersion nozzle outlet cross-section and is therefore decisive for the quality of the mold flow.
- conventional immersion spouts achieve ⁇ values of 0.006 to 0.008.
- G values from 0.011 to 0.015 have to be achieved for casting over-wide cast strands with the same width-thickness ratio. This requires lower speeds in the immersion nozzle, which are achieved through large core and outlet cross sections.
- the immersion spouts according to the invention are distinguished by the greater height h of the lateral outlet openings 8.
- 1 shows a schematic representation of the formation of the mold flow using a flow filament when using a conventional immersion nozzle, the exit jet hitting the bath surface in the area between the immersion nozzle 6 and the narrow narrow side wall 4 and being divided there into two partial jets.
- 2 shows the flow pattern with an immersion nozzle according to the invention, in which the flow is only divided into two partial flows in the area of the narrow side wall 4 and forms two approximately circular vortices.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0095600A AT408962B (en) | 2000-05-31 | 2000-05-31 | METHOD FOR PRODUCING A CONTINUOUS PRE-PRODUCT |
AT9562000 | 2000-05-31 | ||
PCT/EP2001/003304 WO2001091951A1 (en) | 2000-05-31 | 2001-03-23 | Method for the production of a continuously-cast precursor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1286799A1 true EP1286799A1 (en) | 2003-03-05 |
EP1286799B1 EP1286799B1 (en) | 2006-11-15 |
Family
ID=3683523
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01933740A Expired - Lifetime EP1286799B1 (en) | 2000-05-31 | 2001-03-23 | Method and machine for the production of a continuously-cast precursor |
Country Status (6)
Country | Link |
---|---|
US (1) | US6857465B2 (en) |
EP (1) | EP1286799B1 (en) |
CN (1) | CN1208159C (en) |
AT (1) | AT408962B (en) |
DE (1) | DE50111455D1 (en) |
WO (1) | WO2001091951A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060130989A1 (en) * | 2004-12-22 | 2006-06-22 | Kimberly-Clark Worldwide, Inc. | Tissue products treated with a polysiloxane containing softening composition that are wettable and have a lotiony-soft handfeel |
US8678616B2 (en) * | 2009-07-21 | 2014-03-25 | Abl Ip Holding Llc | LED luminaire for display cases |
AT508790B1 (en) * | 2009-09-23 | 2013-11-15 | Siemens Vai Metals Tech Gmbh | METHOD AND DEVICE FOR FORGING METALLIC MELTING FOR CURRENT CAST PRODUCTS IN A CONTINUOUS CASTING MACHINE |
RU2741876C1 (en) * | 2020-07-19 | 2021-01-29 | Акционерное общество «ЕВРАЗ Нижнетагильский металлургический комбинат» (АО «ЕВРАЗ НТМК») | Method for continuous casting of slab bills |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1278624A (en) * | 1968-06-11 | 1972-06-21 | Nippon Kokan Kk | Apparatus for the continuous casting of metal |
DE3709188A1 (en) * | 1987-03-20 | 1988-09-29 | Mannesmann Ag | POURING PIPE FOR METALLURGICAL VESSELS |
JPS63303679A (en) * | 1987-06-05 | 1988-12-12 | Toshiba Ceramics Co Ltd | Dipping nozzle for cast steel |
JPH01245951A (en) * | 1988-03-25 | 1989-10-02 | Nkk Corp | Submerged nozzle for continuous casting |
GB9409183D0 (en) * | 1994-05-07 | 1994-06-29 | British Steel Plc | Continuous casting molds |
DE19647363C2 (en) * | 1996-11-18 | 1999-01-21 | Schloemann Siemag Ag | Immersion spout or pipe |
DE19724232C2 (en) * | 1997-06-03 | 1999-04-15 | Mannesmann Ag | Method and device for producing slabs |
-
2000
- 2000-05-31 AT AT0095600A patent/AT408962B/en not_active IP Right Cessation
-
2001
- 2001-03-23 WO PCT/EP2001/003304 patent/WO2001091951A1/en active IP Right Grant
- 2001-03-23 EP EP01933740A patent/EP1286799B1/en not_active Expired - Lifetime
- 2001-03-23 DE DE50111455T patent/DE50111455D1/en not_active Expired - Lifetime
- 2001-03-23 CN CN01813698.2A patent/CN1208159C/en not_active Expired - Fee Related
- 2001-03-23 US US10/297,285 patent/US6857465B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0191951A1 * |
Also Published As
Publication number | Publication date |
---|---|
US6857465B2 (en) | 2005-02-22 |
ATA9562000A (en) | 2001-09-15 |
AT408962B (en) | 2002-04-25 |
CN1446137A (en) | 2003-10-01 |
US20030159796A1 (en) | 2003-08-28 |
CN1208159C (en) | 2005-06-29 |
WO2001091951A1 (en) | 2001-12-06 |
DE50111455D1 (en) | 2006-12-28 |
EP1286799B1 (en) | 2006-11-15 |
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