CA2220468A1 - Method and device for improving tapping of liquid steel from a smelting furnace into a ladle - Google Patents
Method and device for improving tapping of liquid steel from a smelting furnace into a ladle Download PDFInfo
- Publication number
- CA2220468A1 CA2220468A1 CA 2220468 CA2220468A CA2220468A1 CA 2220468 A1 CA2220468 A1 CA 2220468A1 CA 2220468 CA2220468 CA 2220468 CA 2220468 A CA2220468 A CA 2220468A CA 2220468 A1 CA2220468 A1 CA 2220468A1
- Authority
- CA
- Canada
- Prior art keywords
- ladle
- steel
- furnace
- dome
- tapping
- 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.)
- Abandoned
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 17
- 239000007788 liquid Substances 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000003723 Smelting Methods 0.000 title claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 15
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000003570 air Substances 0.000 description 5
- 229910001341 Crude steel Inorganic materials 0.000 description 4
- 238000005275 alloying Methods 0.000 description 3
- 238000010405 reoxidation reaction Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000000161 steel melt Substances 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002826 nitrites Chemical class 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
- F27B3/19—Arrangements of devices for discharging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D37/00—Controlling or regulating the pouring of molten metal from a casting melt-holding vessel
- B22D37/005—Shielding the molten metal stream
-
- 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
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
A method and a device for improving tapping of liquid steel during the entire tapping period of the steel from a smelting furnace into a ladle. Between the tap hole of the furnace and the ladle bottom or the steel in the ladle an oxygen-free atmosphere with a pressure of > 1 bar is maintained. In the device for carrying out the method, a ladle dome is arranged between the furnace tap and the ladle and the ladle is connected to at least one gas supply.
Description
METHOD AND DEVICE FOR IMPROVING TAPPING OF LIQUID STEEL FROM A
SMELTING FURNACE INTO A LADLE
BACKGRO~ND OF THE lN V~ oN
1. Field of the Invention The present invention relates to a method and a device for improving tapping of liquid steel during the entire tapping period of the steel from a smelting furnace into a ladle.
SMELTING FURNACE INTO A LADLE
BACKGRO~ND OF THE lN V~ oN
1. Field of the Invention The present invention relates to a method and a device for improving tapping of liquid steel during the entire tapping period of the steel from a smelting furnace into a ladle.
2. Description of the Related Art When tapping crude steel or ingot steel, for example, from a converter or an electric furnace, the liquid steel drops freely through the air into a ladle along a distance of about 3-6m.
During this free fall, the liquid steel flow, due to its lowered static pressure Pot relative to the atmospheric pressure of one bar, entrains air and takes air along into the liquid steel column rising in the ladle. The pressure conditions in the steel poured into the ladle, which can be separated into P8t (< 1 bar) and P~m.l can be described with the following equation (1)-Ptotal = P.t + P~m = 1 bar (1) Consequently, this quasi steel jet pump having a surface anda high drop height inevitable introduces oxygen and nitrogen into the steel melt in the ladle by entraining air, so that the elements N2 and ~2 are physically and chemically dissolved in the melt in the ladle. This charging of the steel melt with nitrogen and oxygen in the form of dissolved elements and in the form of nitrites and oxides results in an inferior property of the material and an inferior quality of the final steel product; in addition, a large quantity of alloying elements and long treatment periods, particularly in the area of secondary metallurgy, are required.
Based on experience in the steel mill, it has been found that, when steel drops between furnace and ladle bottom in a pouring jet of about 180mm diameter, approximately 1 m3 per ton of steel is entrained. This leads to an oxygen intake of about 210 Nl/t steel or about 300g oxygen or to an Al consumption of about 340g for the deoxidation; or to about 637g alumina deoxidation products which are partially separated in the ladle slag (raffination) or to a reduction of the oxidic degree of purity. Simultaneously, 7901 nitrogen/t steel or 987.5 g-nitrogen/t steel are introduced into the steel, wherein the nitrogen is partially dissolved in the steel and results in an increase of the nitrogen content of the steel which, in turn, negatively influences the quality of the steel products.
S~MMARY OF THE lNv~llON
Therefore, it is the primary object of the present invention to provide a method and a device of the above-described type in which the aforementioned disadvantages are avoided. In particular, the increased processing and alloying requirements, for example, the use of aluminum for the deoxidation or the use of a degasification stage in the area of secondary metallurgy, are to be reduced or even entirely avoided.
In accordance with the present invention, the above object is met in a surprising and simple manner by adjusting between the tap hole of the furnace and the ladle bottom or the steel in the ladle an oxygen-free atmosphere with a pressure of > 1 bar.
Consequently, by adjusting an oxygen-free atmosphere, preferably by introducing argon, with an excess pressure for substantially shielding the liquid steel over the drop height thereof relative to the ambient air, the disadvantageous -entrainment of air and, thus, large quantities of oxygen, can be avoided.
The significant advantages provided by the invention are:
- reducing the requirement of deoxidation agents in an amount of 340g Al/t steel at a total consumption of about 1 kg Al/t steel in the case of normal Al killed steels;
- improving the oxidic degree of purity by a lower content of oxides, such as alumina, r~m~;n;ng in the steel; and - reducing the nitrogen content increase of the steel, which is particularly significant for electric steel mills, because in electric steel mills a relatively high content of nitrogen reaches the melt in the area of the electrodes.
In the device for carrying out the method, a ladle dome is arranged between the furnace tap and the ladle and the ladle is connected to at least one gas supply.
The ladle dome serves to encapsulate the oxygen-free atmosphere adjusted in the ladle relative to the ambient air underneath the smelting furnace, i.e., between the furnace tap-of the smelting vessel to the ladle edge; in accordance with an advantageous features, for additionally shielding the atmosphere in the ladle in order to protect against reoxidation, a pipe, preferably of refractory material, extends from the furnace tap hole into the ladle dome, wherein the pipe conducts the liquid steel in a bundled manner into the ladle dome or the ladle.
The gas supply, for example, by means of rinsing stones which may be in the form of pipes or by means of rinsing pipes, ensures the oxygen-free atmosphere, wherein the ladle advantageously is already flooded with argon or other comparable gases already before being filled with the liquid steel and the excess pressure of the oxygen-free atmosphere is adjusted. For this purpose, it is proposed that the pressure of the inflowing gas quantity is controlled or regulated and kept constant during the entire tapping period; alternatively, the gas quantity is adjusted and kept constant by means of a pressure regulator.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
~ CA 02220468 1997~ 10 BRIEF DESCRIPTION OF THE DRAWING
In the drawing:
The single figure of the drawing is a schematic illustration of a direct current electric furnace with the reoxidation protection between furnace tap and ladle in accordance with the present invention.
- CA 02220468 lgg7-ll-lo DESCRIPTION OF THE PREFERRED EMBODIMENTS
The figure of the drawing shows the present invention in a direct current electric furnace. However, the invention is not only suitable for an electric furnace, which may be constructed as a direct current furnace or an alternating current furnace, but also for a converter or induction furnace.
Crude steel is melted in a furnace 1 by means of an electrode 2. The crude steel melt 3 covered by a slag layer 4 is in a melting vessel which has on the tap side thereof a recess or bay 5. In the area of the recess 5, the vessel has in the bottom thereof a furnace tap 6 which can be closed by means of a closure 7 in the form of a flap or slide. For effecting slag-free tapping, the melting vessel of the electric furnace 1 is mounted on a swinging device 9 which can be actuated by means of a cylinder 9.1.
A ladle 11 is arranged underneath the furnace tap 6. The ladle 11 has a ladle closure 12 and, in the illustrated embodiment, a rinsing stone 13 and 13' each in the ladle bottom as well as in the ladle wall for introducing argon or other gases; in addition, the drawing shows a rinsing pipe 13.2 extending from the ladle edge to the interior 11.1 of the ladle.
The ladle 11 rests on a ladle carriage 22 which includes a device 23 for lifting and lowering the ladle 11, wherein the device 23 makes it possible to adjust a short distance between the furnace tap or the bottom closure 7 and an opening 10.2 of a ladle dome 10 which encloses the ladle 11 from the ladle edge toward the top.
The ladle dome 10 which is mounted on the ladle edge and bridges the distance to the furnace tap 6 can be swung horizontally and/or vertically; the ladle dome 10 has an opening 18 for adding alloying and deoxidation agents 17 during and after the tapping procedure. Prior to opening the furnace tap 6 and, thus, before starting emptying of the furnace 1, the interior 11.1 of the ladle 11 is advantageous flooded with argon or another gas through the rinsing stones 13 in the bottom or the rinsing stone 13.1' arranged in the ladle wall near the ladle bottom and/or through the rinsing pipe 13'' and, consequently, an oxygen-free atmosphere is adjusted with an excess pressure which is built up to the dome space 10.1. When the furnace tap 6 is opened, the liquid steel 16 flowing into the ladle 11 in the form of a pouring jet 14 cannot entrain any oxygen.
An additional reoxidation protection of the pouring jet 14 during emptying the steel from the electric furnace 1 into the - _ CA 02220468 1997-11-10 ladle 11 is achieved by a short pipe 8 of refractory material which conducts the steel from the furnace tap 6 in a bundled manner into the ladle dome 10 and the ladle 11. The oxygen-free excess pressure atmosphere is maintained during the entire tapping procedure above the ladle bottom or above the metallurgical slag 15 of the liquid bath of liquid steel 16 building up in the ladle 11. Consequently, the liquid steel drops through an air-free gas phase into the ladle during the entire tapping period.
The excess pressure in the dome space 10.1 and the ladle space 11.1 is measured by means of a pressure measuring device 19 and the gas flow (NL/min) of argon or gas is controlled or regulated in such a way that the desired excess pressure of , 1 bar prevails in the entire ladle area up to the upper opening 10.2 of the ladle dome 10. This excess pressure can also be adjusted and kept constant through a pressure regulator 21 which controls the gas quantity 20 during the entire tapping period of the crude steel 3 from the furnace 1 into the ladle 11.
While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.
During this free fall, the liquid steel flow, due to its lowered static pressure Pot relative to the atmospheric pressure of one bar, entrains air and takes air along into the liquid steel column rising in the ladle. The pressure conditions in the steel poured into the ladle, which can be separated into P8t (< 1 bar) and P~m.l can be described with the following equation (1)-Ptotal = P.t + P~m = 1 bar (1) Consequently, this quasi steel jet pump having a surface anda high drop height inevitable introduces oxygen and nitrogen into the steel melt in the ladle by entraining air, so that the elements N2 and ~2 are physically and chemically dissolved in the melt in the ladle. This charging of the steel melt with nitrogen and oxygen in the form of dissolved elements and in the form of nitrites and oxides results in an inferior property of the material and an inferior quality of the final steel product; in addition, a large quantity of alloying elements and long treatment periods, particularly in the area of secondary metallurgy, are required.
Based on experience in the steel mill, it has been found that, when steel drops between furnace and ladle bottom in a pouring jet of about 180mm diameter, approximately 1 m3 per ton of steel is entrained. This leads to an oxygen intake of about 210 Nl/t steel or about 300g oxygen or to an Al consumption of about 340g for the deoxidation; or to about 637g alumina deoxidation products which are partially separated in the ladle slag (raffination) or to a reduction of the oxidic degree of purity. Simultaneously, 7901 nitrogen/t steel or 987.5 g-nitrogen/t steel are introduced into the steel, wherein the nitrogen is partially dissolved in the steel and results in an increase of the nitrogen content of the steel which, in turn, negatively influences the quality of the steel products.
S~MMARY OF THE lNv~llON
Therefore, it is the primary object of the present invention to provide a method and a device of the above-described type in which the aforementioned disadvantages are avoided. In particular, the increased processing and alloying requirements, for example, the use of aluminum for the deoxidation or the use of a degasification stage in the area of secondary metallurgy, are to be reduced or even entirely avoided.
In accordance with the present invention, the above object is met in a surprising and simple manner by adjusting between the tap hole of the furnace and the ladle bottom or the steel in the ladle an oxygen-free atmosphere with a pressure of > 1 bar.
Consequently, by adjusting an oxygen-free atmosphere, preferably by introducing argon, with an excess pressure for substantially shielding the liquid steel over the drop height thereof relative to the ambient air, the disadvantageous -entrainment of air and, thus, large quantities of oxygen, can be avoided.
The significant advantages provided by the invention are:
- reducing the requirement of deoxidation agents in an amount of 340g Al/t steel at a total consumption of about 1 kg Al/t steel in the case of normal Al killed steels;
- improving the oxidic degree of purity by a lower content of oxides, such as alumina, r~m~;n;ng in the steel; and - reducing the nitrogen content increase of the steel, which is particularly significant for electric steel mills, because in electric steel mills a relatively high content of nitrogen reaches the melt in the area of the electrodes.
In the device for carrying out the method, a ladle dome is arranged between the furnace tap and the ladle and the ladle is connected to at least one gas supply.
The ladle dome serves to encapsulate the oxygen-free atmosphere adjusted in the ladle relative to the ambient air underneath the smelting furnace, i.e., between the furnace tap-of the smelting vessel to the ladle edge; in accordance with an advantageous features, for additionally shielding the atmosphere in the ladle in order to protect against reoxidation, a pipe, preferably of refractory material, extends from the furnace tap hole into the ladle dome, wherein the pipe conducts the liquid steel in a bundled manner into the ladle dome or the ladle.
The gas supply, for example, by means of rinsing stones which may be in the form of pipes or by means of rinsing pipes, ensures the oxygen-free atmosphere, wherein the ladle advantageously is already flooded with argon or other comparable gases already before being filled with the liquid steel and the excess pressure of the oxygen-free atmosphere is adjusted. For this purpose, it is proposed that the pressure of the inflowing gas quantity is controlled or regulated and kept constant during the entire tapping period; alternatively, the gas quantity is adjusted and kept constant by means of a pressure regulator.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
~ CA 02220468 1997~ 10 BRIEF DESCRIPTION OF THE DRAWING
In the drawing:
The single figure of the drawing is a schematic illustration of a direct current electric furnace with the reoxidation protection between furnace tap and ladle in accordance with the present invention.
- CA 02220468 lgg7-ll-lo DESCRIPTION OF THE PREFERRED EMBODIMENTS
The figure of the drawing shows the present invention in a direct current electric furnace. However, the invention is not only suitable for an electric furnace, which may be constructed as a direct current furnace or an alternating current furnace, but also for a converter or induction furnace.
Crude steel is melted in a furnace 1 by means of an electrode 2. The crude steel melt 3 covered by a slag layer 4 is in a melting vessel which has on the tap side thereof a recess or bay 5. In the area of the recess 5, the vessel has in the bottom thereof a furnace tap 6 which can be closed by means of a closure 7 in the form of a flap or slide. For effecting slag-free tapping, the melting vessel of the electric furnace 1 is mounted on a swinging device 9 which can be actuated by means of a cylinder 9.1.
A ladle 11 is arranged underneath the furnace tap 6. The ladle 11 has a ladle closure 12 and, in the illustrated embodiment, a rinsing stone 13 and 13' each in the ladle bottom as well as in the ladle wall for introducing argon or other gases; in addition, the drawing shows a rinsing pipe 13.2 extending from the ladle edge to the interior 11.1 of the ladle.
The ladle 11 rests on a ladle carriage 22 which includes a device 23 for lifting and lowering the ladle 11, wherein the device 23 makes it possible to adjust a short distance between the furnace tap or the bottom closure 7 and an opening 10.2 of a ladle dome 10 which encloses the ladle 11 from the ladle edge toward the top.
The ladle dome 10 which is mounted on the ladle edge and bridges the distance to the furnace tap 6 can be swung horizontally and/or vertically; the ladle dome 10 has an opening 18 for adding alloying and deoxidation agents 17 during and after the tapping procedure. Prior to opening the furnace tap 6 and, thus, before starting emptying of the furnace 1, the interior 11.1 of the ladle 11 is advantageous flooded with argon or another gas through the rinsing stones 13 in the bottom or the rinsing stone 13.1' arranged in the ladle wall near the ladle bottom and/or through the rinsing pipe 13'' and, consequently, an oxygen-free atmosphere is adjusted with an excess pressure which is built up to the dome space 10.1. When the furnace tap 6 is opened, the liquid steel 16 flowing into the ladle 11 in the form of a pouring jet 14 cannot entrain any oxygen.
An additional reoxidation protection of the pouring jet 14 during emptying the steel from the electric furnace 1 into the - _ CA 02220468 1997-11-10 ladle 11 is achieved by a short pipe 8 of refractory material which conducts the steel from the furnace tap 6 in a bundled manner into the ladle dome 10 and the ladle 11. The oxygen-free excess pressure atmosphere is maintained during the entire tapping procedure above the ladle bottom or above the metallurgical slag 15 of the liquid bath of liquid steel 16 building up in the ladle 11. Consequently, the liquid steel drops through an air-free gas phase into the ladle during the entire tapping period.
The excess pressure in the dome space 10.1 and the ladle space 11.1 is measured by means of a pressure measuring device 19 and the gas flow (NL/min) of argon or gas is controlled or regulated in such a way that the desired excess pressure of , 1 bar prevails in the entire ladle area up to the upper opening 10.2 of the ladle dome 10. This excess pressure can also be adjusted and kept constant through a pressure regulator 21 which controls the gas quantity 20 during the entire tapping period of the crude steel 3 from the furnace 1 into the ladle 11.
While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.
Claims (15)
1. A method of improving tapping of liquid steel during an entire tapping period of the steel from a smelting furnace into a ladle, the method comprising adjusting between a furnace tap hole and the steel in the ladle an oxygen-free atmosphere having a pressure of >1 bar.
2. The method according to claim 1, comprising controlling and maintaining constant the pressure during the entire tapping period by controlling a gas quantity introduced into the atmosphere.
3. The method according to claim 1, comprising adjusting and maintaining constant a gas quantity in the atmosphere by a pressure regulator.
4. The method according to claim 1, wherein the atmosphere is comprised of argon.
5. The method according to claim 1, wherein the atmosphere partially comprises at least one of CO/CO2 and N2.
6. A device for improving tapping of liquid steel during a tapping period of the steel from a smelting furnace into a ladle, the furnace having a tap, the device comprising a ladle dome between the furnace tap and the ladle, further comprising at least one gas supply connected to the ladle.
7. The device according to claim 6, comprising means for horizontally swinging the ladle dome.
8. The device according to claim 6, comprising means for vertically swinging the ladle dome.
9. The device according to claim 6, comprising a pipe connected to the furnace tap and extending into the ladle dome.
10. The device according to claim 6, wherein the ladle has a ladle bottom and a ladle wall, further comprising rinsing stones arranged in one of the ladle bottom and the ladle wall.
11. The device according to claim 10, wherein the rinsing stones are comprised of pipes.
12. The device according to claim 6, further comprising a rinsing pipe for effecting the gas supply.
13. The device according to claim 6, further comprising a ladle carriage with a lifting and lowering device, the ladle being mounted on the lifting and lowering device.
14. The device according to claim 6, further comprising a pressure measuring device in an interior of the dome.
15. The device according to claim 14, further comprising a pressure regulator connected to the pressure measuring device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP19646738.1 | 1996-11-13 | ||
| DE1996146738 DE19646738C2 (en) | 1996-11-13 | 1996-11-13 | Method and device for metallurgically improved tapping of liquid steel from a melting furnace into a pan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2220468A1 true CA2220468A1 (en) | 1998-05-13 |
Family
ID=7811439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2220468 Abandoned CA2220468A1 (en) | 1996-11-13 | 1997-11-10 | Method and device for improving tapping of liquid steel from a smelting furnace into a ladle |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0853130A1 (en) |
| JP (1) | JPH10183224A (en) |
| BR (1) | BR9705471A (en) |
| CA (1) | CA2220468A1 (en) |
| DE (1) | DE19646738C2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19953262A1 (en) * | 1999-11-05 | 2001-05-10 | Fischer Georg Disa Eng Ag | Production of cast iron products containing spherical graphite from a melt used for vehicle parts comprises reproducing and actively controlling the seed formation ratios |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4401464A (en) * | 1982-04-12 | 1983-08-30 | Scandinavian Lancers Aktiebolaget | Injection metallurgy method and equipment for its execution |
| LU84578A1 (en) * | 1983-01-10 | 1984-10-24 | Wurth Paul Sa | METHOD FOR AVOIDING INTERACTIONS BETWEEN METAL BATH AND ATMOSPHERE |
| DE3321054C1 (en) * | 1983-06-08 | 1984-12-06 | Mannesmann AG, 4000 Düsseldorf | Process and apparatus for the prevention of slag inclusions during the continuous casting of steel |
| DE8422585U1 (en) * | 1984-07-28 | 1984-12-20 | Korf-BSW Engineering GmbH, 7640 Kehl | DEVICE FOR BOTTOM TAPING A METAL MELT FROM A MELTING STOVE OR A SPRAYER |
| JPS6217113A (en) * | 1985-07-16 | 1987-01-26 | Sumitomo Metal Ind Ltd | Sealing device for tapping from converter to prevent nitrogen absorption |
| DE8530922U1 (en) * | 1985-10-31 | 1985-12-19 | Badische Stahlwerke AG, 7640 Kehl | Metal melting furnace |
| JPH0688127B2 (en) * | 1988-03-09 | 1994-11-09 | 川崎製鉄株式会社 | Slag outflow detection method |
| DE4009291A1 (en) * | 1990-03-20 | 1991-09-26 | Mannesmann Ag | Tapping system for metallurgical vessel - has tubular element joining the vessel bottom to reception container top to facilitate tilting |
-
1996
- 1996-11-13 DE DE1996146738 patent/DE19646738C2/en not_active Expired - Fee Related
-
1997
- 1997-11-08 EP EP97119599A patent/EP0853130A1/en not_active Withdrawn
- 1997-11-10 CA CA 2220468 patent/CA2220468A1/en not_active Abandoned
- 1997-11-12 JP JP31085797A patent/JPH10183224A/en not_active Withdrawn
- 1997-11-12 BR BR9705471A patent/BR9705471A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| DE19646738C2 (en) | 1998-12-17 |
| BR9705471A (en) | 1999-05-25 |
| EP0853130A1 (en) | 1998-07-15 |
| DE19646738A1 (en) | 1998-05-14 |
| JPH10183224A (en) | 1998-07-14 |
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