US3587719A - Molten metal supply apparatus for preventing oxide contamination in continuously cast steel products - Google Patents
Molten metal supply apparatus for preventing oxide contamination in continuously cast steel products Download PDFInfo
- Publication number
- US3587719A US3587719A US884337A US3587719DA US3587719A US 3587719 A US3587719 A US 3587719A US 884337 A US884337 A US 884337A US 3587719D A US3587719D A US 3587719DA US 3587719 A US3587719 A US 3587719A
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- US
- United States
- Prior art keywords
- chamber
- mold
- steel
- cross
- section
- 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
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Classifications
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
Definitions
- the present invention relates to equipment for improving the purity of continuously cast steel products, and in particular to improvements in such equipment for separating oxide impurities from the melt during casting. Hanging of the casting ladle, flushing with argon, evacuating and casting in a protective atmosphere, are the known and conventional means employed to improve the purity of molten steel. Nevertheless, impurities cannot be entirely removed with these known methods.
- the objects of the present invention are, therefore, as follows: l size and shape of the impurities should be controlled, particularly during flow into the mold for continuous casting, so that these impurities are capable of rising to the surface level of the molten material when entering the mold. (2) as the molten material is poured into the mold, turbulence is to be produced for causing coagulation of inclusions and for destroying a portion of the kinetic energy of the pouring material so that reaction products and impurities can separate and float to the surface.
- the molten material pours in free fall into a separate chamber in the mold.
- the chamber receives the poured material which flows in the chamber below the surface level of the molten material in the mold, whereby the direction of the average flow of the material in the chamber is changed at least twice prior to introducing the material into the mold at a speed of flow which is reduced, preferably to one-third or less of the initial velocity with which the free falling material hits the surface level.
- the inventive method can be improved further by controlling the atmosphere around the pouring steel, particularly as far as oxygen content and/or content of inert gases is concerned, so that the composition of the impurities in the cast materials and the cast produce can, in turn, be controlled to obtain most favorable consistency.
- the steps suggested to be taken cause precipitation of impurities in and along the walls of the auxiliary chamber. After the liquid material has left the chamber the larger particles rise to the surface level of the steel in the mold.
- the equipment and apparatus in accordance with the invention, is characterized by particular shape and contour of the auxiliary chamber to produce particular zones of turbulent flow to be continued in zones of laminar flow of steel into the mold whereby sufficient space is made available for reaction, and sufficient surfaces are available for depositing most of the impurities and inclusions.
- the auxiliary chamber is defined by a container disposed in the mold having an entrance opening which is above the top of the mold. This container may be connected with ladle or a tundish, below the opening thereof through which molten steel is poured toward the mold.
- This container is provided with lateral exit or outlet openings through which the material leaves the chamber to flow into the mold.
- the lower edge of these openings is disposed somewhat above the bottom of the container.
- these outlet openings are below the surface level of molten material in the mold, as well as in the container; preferably the upper edge of these outlet openings are 2 inches to 4 inches below the surface level of the molten steel.
- this container For troublefree operation, particular dimensions of this container defining the auxiliary chamber were found to be of particular advantage.
- the molten steel is poured from a ladle, tundish or the like, in free fall into the auxiliary chamber.
- This chamber has cross section above its outlets which is at least about four times the cross section of the opening through which the steel is poured.
- the total cross-sectional area of all outlets of the chamber should be at least three times as large as the cross section of the opening for pouring.
- the horizontal cross section of the auxiliary chamber below the outlets is to be smaller than above, where the steel pours into the chamber, but is at least three times the cross section of the opening for pouring. I
- the lateral outlets of the container are preferably com structed as channels which are somewhat downwardly inclined. Inclination and length of these channels depends upon casting cross section and capacity.
- the molten material should flow toward the small side of the cast slab or ingot without, however, disturbing solidification.
- the contour of entrance, outlets and horizontal cross section of the auxiliary chamber should match the cross-sectional contour of the cast product. If the latter is rectangular, these cross sections of the auxiliary chamber should likewise be rectangular.
- the length of the opening through which liquid metal pours toward the auxiliary chamber does not exceed twice the diameter of that opening.
- H6. 1 is a side elevation and partial cross-sectional view through casting equipment improved in accordance with the present invention.
- FIGS. 2 and 3 illustrate modifications of the container used in the equipment shown in FIG. 1.
- FIG. 1 there is illustrated a metal supply vessel 1 such as a casting ladle or a tundish.
- the ladle is particularly provided to operate as a distributor, having a bottom opening 10 controlled by a stopper rod 2.
- the liquid metal 3 pours out of opening la in free falling stream 4 into a container defining an auxiliary chamber 5.
- Chamber 5 extends below the surface level 9 of the molten material in a watercooled mold 6.
- the bottom 7 of chamber 5, therefore, is below the liquid level in mold 6, so are outlet openings 8 of chamber 5.
- the slab or ingot to be produced by continuous casting is shown at 10 as it leaves the bottom of mold 6.
- the already solidified portion of the continuously cast product is denoted with reference numeral 1 1.
- This particular embodiment should be used in particular for continuously casting slabs or ingots having rather small width, particularly a width between 32 inches to 52 inches (800 and 1300 mm.).
- the upper surface level 9 of the liquidous material in mold 6 is covered with material 12 as is known, per se, as a covering material. .Under such circumstances, for example, it is slag.
- the slab 11 leaving the bottom mold 6 is supported and guided by means of rolls 13 or the like.
- the casting metal is poured in free fall from the ladle l in form ofa stream emerging from opening la, and the cross section of chamber 5 above the exit or outlet openings 8 should be at least about four times as large as the cross section of opening la.
- the downwardly directed, lateral outlet openings 8 together should have a cross section which is at least three times as large as the cross section of opening la.
- the cross section of chamber 5 below the lower edge of openings 8 where communicating with the interior of the chamber should be smaller than the cross section of chamber 5 above the openings 8.
- the cross-sectional area of chamber 5 below openings 8 should be at least about three times as large as the cross-sectional area of the opening la.
- FIG. 2 illustrates another configuration of the auxiliary chamber in accordance with the invention.
- the outlet openings 8' are defined by channels 14.
- the channels 14 are inclined, the inclination being more fully pronounced because of the channel configuration.
- the inclination and length of the channels will depend to some extent upon the cross section of the slab to be cast and upon the amount of material used per unit time.
- the cross section of the entrance opening of the chamber in H6. 2 illustrates the situation where each side of chamber 5 is provided with an outlet. However, it is conceivable to provide several outlets, one above the other.
- the particular case illustrated here will be employed preferably for casting slab with a width above 52 inches.
- the channels 14 are comparatively long with an angle of 60 to 70 relative to the casting direction.
- FIG. 3 shows still another embodiment for the invention.
- chamber 5 has outlet openings defined by rather short channels, whereby the upper wall 15 of such a channel is actually at right angles, while the lower wall portions 14 are inclined.
- the inclination angle should not exceed 45 in this situation.
- the inventive equipment can be used with particular advantage when the liquid metal is cast and the slab is guided along a curve below the cover 12; cover 12 binds the oxides rising in the molten steel.
- chamber 5 is provided with additional entrance and exit openings 16 above level 9 to introduce gases containing oxygen and/or inert gases into chamber 5.
- the composition of the impurities in the cast material can be controlled through properly selecting and proportioning the constituents of the gas fed into that particular chamber.
- Apparatus for continuous casting of steel there being a mold and equipment for introducing liquid steel into the mold, the steel in the mold having a surface level;
- first means including a liquid steel supply vessel having an opening of particular cross section, for providing a free falling stream of liquid steel into the mold;
- second means disposed in the mold defining a chamber open at the top and having side wall and-closed bottom beneath said surface level, for receiving the free falling stream, the chamber having cross section area at least about four times the particular cross section of the opening of the vessel, so that the stream falls into a surface level of liquid steel in the chamber at a distance from the wall of the chamber above the surface level;
- the chamber as defined by the second means having at least one outwardly and downwardly directed outlet channel communicating with the chamber above the bottom thereof, the horizontal cross section of the chamber below the outlet channel being smaller than above the the outlet channel, but at least about three times larger than the cross section of the liquid stream.
- the chamber having outlet channels for introducing the liquid steel into the mold, the upper edge of the outlet channels being 2 inches to 4 inches below the surface level ofsteel in the mold.
- the third means as defining the lateral openings, directing the flow at an angle in downward direction and sideways away from the direction of the downflow in the chamber.
- Apparatus as in claim 1 and including fourth means defining a second chamber between the first means and the first chamber;
- Apparatus as in claim 1 including fourth means defining a second chamber extending between the first means and the liquid level in the first chamber; and means for introducing a gas containing an inert gas into the second chamber.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19681817067 DE1817067B1 (de) | 1968-12-21 | 1968-12-21 | Einrichtung zum abscheiden von verunreinigungen aus fluessi gem stahl waehrend des stranggiessens und ein verfahren dazu |
Publications (1)
Publication Number | Publication Date |
---|---|
US3587719A true US3587719A (en) | 1971-06-28 |
Family
ID=5717431
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US884337A Expired - Lifetime US3587719A (en) | 1968-12-21 | 1969-12-11 | Molten metal supply apparatus for preventing oxide contamination in continuously cast steel products |
Country Status (7)
Country | Link |
---|---|
US (1) | US3587719A (ja) |
JP (1) | JPS5142048B1 (ja) |
CA (1) | CA938773A (ja) |
DE (1) | DE1817067B1 (ja) |
FR (1) | FR2026794B1 (ja) |
GB (1) | GB1250120A (ja) |
NL (1) | NL6919235A (ja) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3677325A (en) * | 1969-10-10 | 1972-07-18 | Foseco Int | Process of submerged nozzle continuous casting using a basalt flux |
US3698466A (en) * | 1969-12-30 | 1972-10-17 | Mannesmann Ag | Method for continuous casting of steel |
US3703924A (en) * | 1970-10-09 | 1972-11-28 | Timken Roller Bearing Co | Apparatus for introducing molten metal into a strand casting mold |
US3865175A (en) * | 1972-02-03 | 1975-02-11 | Voest Ag | Process for separating non-metallic inclusions from hot liquid metal |
US3883050A (en) * | 1972-02-03 | 1975-05-13 | Voest Ag | Refractory casting tube for casting hot liquid metals |
US3931850A (en) * | 1974-03-11 | 1976-01-13 | Mannesmann Aktiengesellschaft | Apparatus for feeding and distributing steel melts |
US3934638A (en) * | 1971-02-08 | 1976-01-27 | Inland Steel Company | Continuous casting process |
US3935895A (en) * | 1973-06-14 | 1976-02-03 | Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft | Continuous steel casting method |
US3982582A (en) * | 1973-12-08 | 1976-09-28 | Concast Ag | Method and apparatus for casting metals into a continuous casting mold |
US4819840A (en) * | 1986-07-12 | 1989-04-11 | Thyssen Stahl Aktiengesellschaft | Refractory submerged pouring nozzle |
US5205343A (en) * | 1989-06-03 | 1993-04-27 | Sms Schloemann-Siemag Aktiengesellschaft | Pouring tube for feeding molten steel into a continuous casting mold |
US20040159987A1 (en) * | 2003-02-14 | 2004-08-19 | Bederka Daniel J. | Submerged entry nozzle and method for maintaining a quiet casting mold |
US20110173925A1 (en) * | 2010-01-20 | 2011-07-21 | Hill Phoenix, Inc. | Structural insulated panel system |
CN105458196A (zh) * | 2015-12-07 | 2016-04-06 | 东北大学 | 一种双辊薄带连铸用水口 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE790371A (fr) * | 1971-10-21 | 1973-02-15 | Voest Ag | Tube de coulee refractaire pour le coulage en continu de metauxen fusion |
US4898226A (en) * | 1987-06-01 | 1990-02-06 | Nkk Corporation | Immersion nozzle for continuous casting of steel |
JPH0767602B2 (ja) * | 1987-06-01 | 1995-07-26 | 日本鋼管株式会社 | 連続鋳造浸漬ノズル |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE843137C (de) * | 1942-04-14 | 1952-07-07 | Wieland Werke Ag | Rohrzufuehrung fuer das schmelzfluessige Giessgut beim stetigen Giessen von Metallen |
CH387883A (de) * | 1959-10-13 | 1965-02-15 | Beteiligungs & Patentverw Gmbh | Giessvorrichtung |
US3331430A (en) * | 1964-09-10 | 1967-07-18 | Kennecott Copper Corp | Continuous casting apparatus for casting hollow billets |
FR1492871A (fr) * | 1966-04-07 | 1967-08-25 | Tsnii Tchornoy Metallourgiy | Procédé et installation pour l'introduction du métal liquide dans une lingotièred'une machine de coulée continue |
FR1474632A (fr) * | 1966-04-06 | 1967-03-24 | United States Steel Corp | Appareil et procédé pour la coulée continue de métal |
FR1542950A (fr) * | 1966-10-18 | 1968-10-18 | Metacon Ag | Dispositif de coulée |
-
1968
- 1968-12-21 DE DE19681817067 patent/DE1817067B1/de not_active Withdrawn
-
1969
- 1969-12-11 US US884337A patent/US3587719A/en not_active Expired - Lifetime
- 1969-12-19 CA CA070352A patent/CA938773A/en not_active Expired
- 1969-12-19 FR FR696944068A patent/FR2026794B1/fr not_active Expired
- 1969-12-20 JP JP44102133A patent/JPS5142048B1/ja active Pending
- 1969-12-22 NL NL6919235A patent/NL6919235A/xx unknown
- 1969-12-22 GB GB1250120D patent/GB1250120A/en not_active Expired
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3677325A (en) * | 1969-10-10 | 1972-07-18 | Foseco Int | Process of submerged nozzle continuous casting using a basalt flux |
US3698466A (en) * | 1969-12-30 | 1972-10-17 | Mannesmann Ag | Method for continuous casting of steel |
US3703924A (en) * | 1970-10-09 | 1972-11-28 | Timken Roller Bearing Co | Apparatus for introducing molten metal into a strand casting mold |
US3934638A (en) * | 1971-02-08 | 1976-01-27 | Inland Steel Company | Continuous casting process |
US3865175A (en) * | 1972-02-03 | 1975-02-11 | Voest Ag | Process for separating non-metallic inclusions from hot liquid metal |
US3883050A (en) * | 1972-02-03 | 1975-05-13 | Voest Ag | Refractory casting tube for casting hot liquid metals |
US3935895A (en) * | 1973-06-14 | 1976-02-03 | Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft | Continuous steel casting method |
US3982582A (en) * | 1973-12-08 | 1976-09-28 | Concast Ag | Method and apparatus for casting metals into a continuous casting mold |
US3931850A (en) * | 1974-03-11 | 1976-01-13 | Mannesmann Aktiengesellschaft | Apparatus for feeding and distributing steel melts |
US4819840A (en) * | 1986-07-12 | 1989-04-11 | Thyssen Stahl Aktiengesellschaft | Refractory submerged pouring nozzle |
US5205343A (en) * | 1989-06-03 | 1993-04-27 | Sms Schloemann-Siemag Aktiengesellschaft | Pouring tube for feeding molten steel into a continuous casting mold |
US20040159987A1 (en) * | 2003-02-14 | 2004-08-19 | Bederka Daniel J. | Submerged entry nozzle and method for maintaining a quiet casting mold |
US6932250B2 (en) | 2003-02-14 | 2005-08-23 | Isg Technologies Inc. | Submerged entry nozzle and method for maintaining a quiet casting mold |
US20110173925A1 (en) * | 2010-01-20 | 2011-07-21 | Hill Phoenix, Inc. | Structural insulated panel system |
CN105458196A (zh) * | 2015-12-07 | 2016-04-06 | 东北大学 | 一种双辊薄带连铸用水口 |
CN105458196B (zh) * | 2015-12-07 | 2018-05-29 | 东北大学 | 一种双辊薄带连铸用水口 |
Also Published As
Publication number | Publication date |
---|---|
GB1250120A (ja) | 1971-10-20 |
DE1817067B1 (de) | 1971-04-29 |
JPS5142048B1 (ja) | 1976-11-13 |
FR2026794B1 (ja) | 1973-03-16 |
FR2026794A1 (ja) | 1970-09-18 |
CA938773A (en) | 1973-12-25 |
NL6919235A (ja) | 1970-06-23 |
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