EP0230124B1 - Prévention de l'entraînement de constituants d'alliage non dissouts dans une lingotière de coulée continue - Google Patents
Prévention de l'entraînement de constituants d'alliage non dissouts dans une lingotière de coulée continue Download PDFInfo
- Publication number
- EP0230124B1 EP0230124B1 EP86309716A EP86309716A EP0230124B1 EP 0230124 B1 EP0230124 B1 EP 0230124B1 EP 86309716 A EP86309716 A EP 86309716A EP 86309716 A EP86309716 A EP 86309716A EP 0230124 B1 EP0230124 B1 EP 0230124B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tundish
- outlet opening
- molten
- alloying ingredient
- undissolved
- 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
-
- 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
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/118—Refining the metal by circulating the metal under, over or around weirs
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
Definitions
- the present invention relates generally to the continuous casting of molten steel and more particularly to preventing undissolved alloying ingredient denser than steel from entering the continuous casting mold.
- a stream of molten steel is poured from a ladle into an intermediate vessel known as a tundish having a bottom containing outlet openings through which molten steel flows into a continuous casting mold.
- Free machining steels contain lead and/or bismuth to improve the machinability of the steel. Typical contents for each are about 0.04-0.40 wt.% bismuth and 0.05-0.50 wt.% lead.
- Lead or bismuth may be added to the stream of molten steel entering the tundish.
- Lead and bismuth have a relatively low solubility in molten steel, compared to other alloying ingredients added to molten steel, and lead and bismuth are denser than molten steel. Because of these properties, substantial amounts of undissolved lead and bismuth tend to accumulate at the bottom of the tundish. If these accumulations of undissolved lead and bismuth are allowed to flow out through the outlet openings in the bottom of the tundish, they will do so as relatively large globules, and this will be manifest in the solidified steel as large, localized concentrations of lead or bismuth, which is undesirable.
- the present invention provides a method and structure for preventing undissolved molten lead or bismuth from flowing through the outlet openings in the tundish into the continuous casting mold.
- the present invention also provides a method and structure for withdrawing accumulations of undissolved lead or bismuth from the tundish without simultaneously removing the molten steel.
- Molten steel is conventionally introduced into the tundish at an entry location spaced linearly along the vessel bottom from each of the outlet openings, and the molten steel normally flows along the bottom of the tundish downstream from the entry location to an outlet opening.
- a method and structure in accordance with the present invention prevents molten metal from flowing along a continuous descending or horizontal path along the tundish bottom from the entry location to an outlet opening.
- EP-A-0124667 discloses in such a method in which molten steel is introduced into a tundish having opposed sidewalls, at a tundish entry location spaced linearly along the bottom of the tundish from an outlet opening at the bottom of the tundish, said molten steel is flowed from said entry location to said outlet opening along a path on the tundish bottom having structural elements interposed in said path, and said molten steel is then flowed through said outlet opening to form a descending stream of molten metal, a procedure, for use with molten steel containing an undissolved molten alloying ingredient having a density greater than said molten steel at the temperature of said molten steel, to prevent large globules of said undissolved alloying ingredient from being carried into said stream.
- the invention as claimed is intended to provide an improved procedure.
- the invention as claimed prevents undissolved alloying ingredient in the molten steel from entering an outlet opening and causes the undissolved alloying ingredient to accumulate on the vessel bottom at a location spaced from the outlet opening while dissolved alloying ingredients of the same and other compositions are allowed to enter the outlet opening.
- the dams claimed usually rest atop the surface of the tundish bottom, and sloping the vessel bottom upwardly to the dam, in the manner described above, prevents undissolved alloying ingredient from seeping or otherwise flowing underneath the dam to the downstream side thereof and into the outlet opening.
- the present invention prevents large accumulations of alloying ingredient on the vessel bottom by providing, at the bottom of the tundish, a sump located between the entry location and an outlet opening and having a floor which is lower than the top of the outlet opening.
- the relatively dense, undissolved molten alloying ingredient collects in the sump, as a result of the difference in density between it and the molten steel.
- the sump floor is preferably composed of a porous refractory material which is impervious to the molten steel but porous to the molten alloying ingredient at the temperature of the molten steel primarily because of the lower surface tension of the molten alloying ingredient (lead or bismuth) compared to the molten steel, and also, to a lesser extent, because of the lower melting point and lower viscosity of these alloying ingredients.
- molten alloying ingredient lead or bismuth
- Tundish 20 comprises a steel shell 21 having an interior refractory lining 22.
- Tundish 20 includes a bottom 25 having a plurality of outlet openings 26, 26 each communicating with an outlet conduit or spigot 27.
- a stream of molten metal from a ladle enters tundish 20 through a conduit 28 which directs the stream of molten metal toward an entry location 29 on or adjacent tundish bottom 25. Alloying ingredients, such as lead or bismuth, are typically introduced into the stream of molten metal flowing through conduit 28, for example. Entry location 29 is spaced linearly along the vessel bottom from each outlet opening 26. As the tundish fills, the entry location rises to the level of the bottom end 36 of conduit 28. A descending stream of molten metal flows through each outlet opening 26 and its respective spigot 27 into a continuous casting mold (not shown).
- a procedure for preventing large globules of the undissolved alloying ingredient from being carried into the descending stream of molten steel. More particularly, the molten metal in tundish 25 is prevented from following a continuous descending or horizontal path across tundish bottom 25 downstream from entry location 29 to the top of an outlet opening 26. This is accomplished by providing one or more of the expedients described below.
- the desired downward, upward and then downward motion can also be obtained by reversing the respective locations of weir 47 and dam 50 or of dams 54 and 56. In such a case, the undissolved alloying ingredient settles out between entry location 29 and the closest downstream dam.
- the tundish may include one or more of the expedients illustrated in Figs. 5-8, all of which perform the function of preventing the molten metal in the tundish from following a continuous descending or horizontal path across the vessel bottom downstream from entry location 29 to the top of an outlet opening 26. As a result, large globules of undissolved alloying ingredient are prevented from being carried through an outlet opening 26 into the strand of molten metal entering the continuous casting mold.
- tundish bottom 25 is provided with a sump 60 located between entry location 29 and an outlet opening 26.
- Sump 60 has a floor 61 which is lower than the top of any outlet opening 26. Undissolved molten alloying ingredient collects in sump 60, as a result of the difference in density between the molten alloying ingredient (e.g. lead or bismuth) and the molten steel.
- molten alloying ingredient e.g. lead or bismuth
- sump floor 61 is constructed from a porous refractory material which is impervious to molten steel but is porous to the molten alloying ingredient primarily because the molten alloying ingredient (lead and/or bismuth) has a lower surface tension than the molten steel. Also contributing to this effect are the fact that the lead and/or bismuth have a lower melting point than the molten steel and, to a lesser extent, the fact that the molten alloying ingredient is less viscous than the molten steel at the temperature of the molten steel.
- the undissolved molten alloying ingredient which accumulates in sump 60 drains from the sump through porous floor 61 while the molten steel will not drain therethrough.
- Communicating with the bottom of floor 61 is the upper end of a drain conduit 62.
- Molten alloying ingredient draining from sump 60 enters conduit 62 which conducts it away from tundish 20.
- sump 60 is shown as extending between tundish sidewalls 44, 45 at a location between entry location 29 and outlet openings 26, 26.
- An alternative would be an annular sump surrounding each outlet opening 26.
- a further alternative would be a circular sump located between entry location 29 and an outlet opening 26 with that part of vessel bottom 25 surrounding the circular sump sloping downwardly toward the sump for a substantial distance.
- porous refractory material from which sump floor 61 may be composed are set forth below.
- molten steel with which the present invention may be employed comprise any steel to which lead and bismuth have heretofore been added to improve machinability.
- the present invention is applicable to steels containing other alloying ingredients having at least some of the above-described properties of lead and bismuth.
- These properties comprise, at the very least, an insolubility in molten steel sufficient to provide substantial amounts of undissolved alloying ingredient in the molten steel in the tundish and a density greater than molten steel.
- Other properties comprise a surface tension less than molten steel, a melting point less than steel, and a viscosity less than that of the molten steel at the temperature of the molten steel in the tundish.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Continuous Casting (AREA)
Claims (19)
le bord supérieur (33) de ladite ouverture de sortie rehaussée (26) se trouve à une hauteur supérieure à l'épaisseur de la couche d'ingrédient d'alliage non dissous qui s'accumule sur le fond (25) du panier de coulée.
ladite digue réfractaire d'entourage (31) est dépourvue de passages d'écoulement jusqu'à une hauteur au moins égale à l'épaisseur de la couche d'ingrédient d'alliage dissous qui s'accumule sur le fond (25) du panier de coulée.
ladite digue réfractaire d'entourage (31) a une hauteur supérieure à l'épaisseur de la couche d'ingrédient d'alliage non dissous qui s'accumule sur le fond (25) du panier de coulée.
l'évacuation de l'ingrédient d'alliage en fusion non dissous dudit puisard (60) à travers ledit matériau de fond poreux du puisard sans évacuation dudit acier en fusion à travers celui-ci.
l'orientation dudit métal en fusion le long d'un parcours tortueux comprenant des parties descendante, montante et descendante successives entre ledit emplacement d'entrée (29) et ladite ouverture de sortie (26) pour faire se déposer ledit ingrédient d'alliage non dissous se séparant dudit métal en fusion alors que le métal en fusion passe d'un écoulement de sens descendant à un écoulement de sens montant.
ledit ingrédient d'alliage est au moins l'un des composants comprenant le plomb et le bismuth.
le bord supérieur (33) de ladite ouverture de sortie rehaussée (26) est situé à une hauteur supérieure à l'épaisseur de la couche d'ingrédient d'alliage non dissous pouvant normalement s'accumuler sur le fond (25) du panier de coulée.
ladite digue réfractaire d'entourage (31) est dépourvue de passages d'écoulement jusqu'à une hauteur au moins égale à l'épaisseur de la couche d'ingrédient d'alliage non dissous pouvant normalement s'accumuler sur le fond (25) du panier.
ladite digue réfractaire d'entourage (31) a une hauteur supérieure à l'épaisseur de la couche d'ingrédient d'alliage non dissous pouvant normalement s'accumuler sur le fond (25) du panier.
des moyens pour diriger ledit métal en fusion le long d'un parcours tortueux comprenant des parties descendante, montante et descendante successives entre ledit emplacement d'entrée (29) et ladite ouverture de sortie (26) pour faire se déposer ledit ingrédient d'alliage non dissous en se séparant dudit métal en fusion à un emplacement éloigné de l'ouverture de sortie alors que le métal en fusion passe d'un écoulement de sens descendant à un écoulement de sens montant.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US80857085A | 1985-12-13 | 1985-12-13 | |
US808570 | 1997-02-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0230124A1 EP0230124A1 (fr) | 1987-07-29 |
EP0230124B1 true EP0230124B1 (fr) | 1991-04-17 |
Family
ID=25199136
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86309716A Expired - Lifetime EP0230124B1 (fr) | 1985-12-13 | 1986-12-12 | Prévention de l'entraînement de constituants d'alliage non dissouts dans une lingotière de coulée continue |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0230124B1 (fr) |
AU (2) | AU584851B2 (fr) |
BR (1) | BR8606159A (fr) |
CA (1) | CA1267766A (fr) |
DE (1) | DE3678817D1 (fr) |
ES (1) | ES2021599B3 (fr) |
IN (1) | IN169103B (fr) |
MX (1) | MX170152B (fr) |
ZA (1) | ZA869345B (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4828014A (en) * | 1985-12-13 | 1989-05-09 | Inland Steel Company | Continuous casting tundish and assembly |
US4711429A (en) * | 1986-08-29 | 1987-12-08 | Usx Corporation | Tundish for mixing alloying elements with molten metal |
KR101949698B1 (ko) * | 2017-07-14 | 2019-02-19 | 주식회사 포스코 | 용융물 처리 장치 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3671224A (en) * | 1970-08-17 | 1972-06-20 | Republic Steel Corp | Methods of producing leaded steel |
DE2316757C3 (de) * | 1973-04-04 | 1978-08-03 | Thermo-Industrie Gmbh & Co Kg, 3300 Braunschweig | Gießpfanne für Stahl |
US4125146A (en) * | 1973-08-07 | 1978-11-14 | Ernst Muller | Continuous casting processes and apparatus |
AR206969A1 (es) * | 1975-06-17 | 1976-08-31 | Foseco Trading Ag | Artesa de colada con vertederos |
DE2555286A1 (de) * | 1975-12-09 | 1977-06-23 | Kloeckner Werke Ag | Verfahren zum abgiessen von mit silizium und/oder aluminium beruhigten staehlen im strang |
JPS58154446A (ja) * | 1982-03-06 | 1983-09-13 | Daido Steel Co Ltd | 鋼の連続鋳造方法およびそのための溶湯容器 |
JPS5992151A (ja) * | 1982-11-18 | 1984-05-28 | Sumitomo Metal Ind Ltd | 連続鋳造法による鉛快削鋼の製造方法 |
AU1420183A (en) * | 1983-05-03 | 1984-11-08 | Aikoh Co. Ltd. | Tundish for steel casting |
CH663367A5 (de) * | 1984-05-23 | 1987-12-15 | Stopinc Ag | Angiessvorrichtung an einem zwischenbehaelter in stranggussanlagen. |
DE3425081C2 (de) * | 1984-07-07 | 1986-07-24 | Krupp Stahl Ag, 4630 Bochum | Verteilerrinne für mehradrige Metallstranggießanlagen |
US4711429A (en) * | 1986-08-29 | 1987-12-08 | Usx Corporation | Tundish for mixing alloying elements with molten metal |
-
1986
- 1986-09-05 CA CA000517578A patent/CA1267766A/fr not_active Expired - Fee Related
- 1986-12-02 IN IN935/MAS/86A patent/IN169103B/en unknown
- 1986-12-03 AU AU66069/86A patent/AU584851B2/en not_active Ceased
- 1986-12-08 MX MX004581A patent/MX170152B/es unknown
- 1986-12-11 ZA ZA869345A patent/ZA869345B/xx unknown
- 1986-12-11 BR BR8606159A patent/BR8606159A/pt not_active IP Right Cessation
- 1986-12-12 DE DE8686309716T patent/DE3678817D1/de not_active Expired - Lifetime
- 1986-12-12 EP EP86309716A patent/EP0230124B1/fr not_active Expired - Lifetime
- 1986-12-12 ES ES86309716T patent/ES2021599B3/es not_active Expired - Lifetime
-
1989
- 1989-04-19 AU AU33196/89A patent/AU599536B2/en not_active Ceased
Also Published As
Publication number | Publication date |
---|---|
CA1267766A (fr) | 1990-04-17 |
IN169103B (fr) | 1991-09-07 |
AU6606986A (en) | 1987-06-18 |
AU599536B2 (en) | 1990-07-19 |
BR8606159A (pt) | 1987-09-22 |
EP0230124A1 (fr) | 1987-07-29 |
MX170152B (es) | 1993-08-10 |
AU584851B2 (en) | 1989-06-01 |
AU3319689A (en) | 1989-06-29 |
ZA869345B (en) | 1987-09-30 |
ES2021599B3 (es) | 1991-11-16 |
DE3678817D1 (de) | 1991-05-23 |
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