EP0006453A1 - Process for increasing the lifetime of flush gas lances with porous lance heads made of graphite and inertion cage used therefor - Google Patents
Process for increasing the lifetime of flush gas lances with porous lance heads made of graphite and inertion cage used therefor Download PDFInfo
- Publication number
- EP0006453A1 EP0006453A1 EP79101605A EP79101605A EP0006453A1 EP 0006453 A1 EP0006453 A1 EP 0006453A1 EP 79101605 A EP79101605 A EP 79101605A EP 79101605 A EP79101605 A EP 79101605A EP 0006453 A1 EP0006453 A1 EP 0006453A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- graphite
- lance
- cage
- inerting
- purging
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 21
- 239000010439 graphite Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 8
- 239000007789 gas Substances 0.000 claims abstract description 19
- 238000010926 purge Methods 0.000 claims abstract description 16
- 239000000155 melt Substances 0.000 claims abstract description 12
- 239000011261 inert gas Substances 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000011010 flushing procedure Methods 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 229910052786 argon Inorganic materials 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/002—Treatment with gases
- B22D1/005—Injection assemblies therefor
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
- F27D1/1678—Increasing the durability of linings; Means for protecting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/168—Introducing a fluid jet or current into the charge through a lance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
Definitions
- the invention relates to a method and a device for increasing the service life of gas purging lances with porous purge heads made of graphite for non-ferrous metal melts.
- the primary focus here is on aluminum melts that are flushed with argon.
- the melt is cleaned, homogenized and degassed by flushing the molten metal with an inert gas. Rinsing is the last stage of treatment before the melt is poured.
- the gas purging lance is lowered manually or mechanically into the crucible and the melt is flushed with an inert gas for about 5 to 10 minutes.
- the rinsing treatment improves the quality of the castings, namely that they have a dense structure and freedom from pores and also a good form filler may be achieved.
- the gas purging lances have flushing heads made of porous materials. Since the lances are exposed to the high temperatures of the molten metal, their lifespan is naturally short. This applies üllanzen p for Gass with rinsing heads of porous graphite, although graphite is a temperature-resistant material and the lance tube can be made of graphite. The durability of graphite lances is nevertheless low, since the graphite burns out after being used in the melt due to atmospheric oxygen.
- the object of the invention is to increase the durability of such graphite lances by preventing the graphite from burning out after use in the melt.
- a method has now been found for increasing the service life of gas purging lances with porous graphite purging heads for non-ferrous metal melts, in which, according to the invention, the lance immediately after purging in an inerting cage which surrounds the graphite parts of the lance to form a gap with an inert gas until the ignition temperature of graphite falls below.
- the inerting cage for carrying out the method according to the invention preferably consists of two half-shells which adapt to the shape of the graphite parts of the lance, forming a narrow gap.
- the gap should be kept as narrow as possible, since then higher gas velocities are reached, which means that the lance cools down faster.
- the half-shells can be ge by a hinge connected in an articulated manner and lockable in the folded state. This enables the lance to be inserted particularly quickly into the inerting cage after use in the melt.
- the inerting cage is detachably installed on the bottle wagon on which the gas bottle is transported with the purge gas, so that a uniform implement is obtained.
- FIG. 1 shows the flushing head 1 made of porous graphite from a gas flushing lance.
- the flushing head 1 is attached to the lance tube 2, which is preferably also made of graphite.
- the lance tube 2 is surrounded by an inerting cage which consists of two half-shells 3, 4.
- the half-shells 3, 4 are articulated to one another by a hinge 5.
- a plate is welded to the half-shell 3, which is closed in the its condition represents the bottom of the cage.
- the half-shells 3, 4 are shaped such that, when closed, they surround the flushing head 1 and the lance tube 2, forming a narrow gap 6, and thus form the inerting cage.
- Fig.2 shows the device in cross section.
- FIG. 3 shows the device according to FIGS. 1 and 2 detachably installed on a bottle trolley 7 by means of a screw connection.
- the compressed gas bottle 8 which contains the purge gas for the molten metal, for example argon, is fastened on the bottle trolley 7. Furthermore, a second compressed gas bottle 9 is provided, which contains the nitrogen for cooling and inerting the lance.
- the argon flows out of the bottle 8 through the pressure reducer with flow meter 10, the pressure gas hose 11 and the lance tube 2 and the flushing head 1 into the molten metal, for example aluminum.
- the gas purging lance has been used in the melt, it is quickly placed on the plate 12 and placed in the half-shell 3. Then the half-shell 4 is folded onto the half-shell 3 and both half-shells are firmly connected to one another by means of the latch 13.
- the argon supply is now interrupted and instead the nitrogen supply is released for cooling and inerting.
- the nitrogen flows from the compressed gas cylinder 9 through the pressure regulator with flow meter 14 and the T-piece 5 1 11 in the compressed gas hose He then passes out of the washing head 1 through the narrow gap 6 along the lance tube 2 to the outside. This prevents the entry of atmospheric oxygen to the graphite and thus prevents the graphite from burning out.
- the flushing head 1 and the lance tube 2 become narrow due to the high gas velocity Gap 6 cooled quickly, so that the ignition temperature of graphite will soon fall below.
- the inert gas supply is interrupted and the lance can be safely removed from the inerting cage. As a result of the rapid cooling of the flushing head 1 and lance tube 2, the inert gas consumption is low.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Bei einem Vertahren zur Erhöhung der Lebensdauer von Gasspüllanzen mit porösen Spülkörpern aus Grafit für Nichteisen-Metallschmelzen, werden die Lanzen zwecks Verhinderung der Oxidation des Grafits unmittelbar nach dem Spülen solange von Inertgas durchströmt, bis die Zündtemperatur des Grafits unterschritten ist. Hierzu wird die Lanze in einem Inertisierungskäfig gelegt, der aus zwei gelenkig miteinander verbundenen Halbschalen (3, 4) besteht, die im zusammengeklappten Zustand miteinander verriegelbar (13) sind und die die aus Grafit bestehenden Teile der Lanze unter Ausbildung eines engen Spaltes umgeben.If a procedure is used to increase the service life of gas purging lances with porous purging bodies made of graphite for non-ferrous metal melts, inert gas flows through the lances to prevent oxidation of the graphite immediately after purging until the ignition temperature of the graphite has fallen below. For this purpose, the lance is placed in an inerting cage, which consists of two hinged half-shells (3, 4), which can be locked together (13) in the folded state and which surround the graphite parts of the lance, forming a narrow gap.
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Erhöhung der Lebensdauer von Gasspüllanzen mit porösen Spülköpfen aus Grafit für Nichteisen-Metallschmelzen. Hierbei ist vor allem an Aluminiumschmelzen gedacht, die mit Argon gespült werden.The invention relates to a method and a device for increasing the service life of gas purging lances with porous purge heads made of graphite for non-ferrous metal melts. The primary focus here is on aluminum melts that are flushed with argon.
Durch das Spülen der Metallschmelze mit einem Inertgas wird die Schmelze gereinigt, homogenisiert und entgast. Das Spülen ist die letzte Behandlungsstufe vor dem Vergießen der Schmelze. Die Gasspüllanze wird manuell oder mechanisch in den Tiegel gesenkt und die Schmelze etwa 5 - 10 Min. lang mit einem Inertgas gespült. Durch die Spülbehandlung wird die Qualität der Gußstücke verbessert, indem diese nämlich ein dichtes Gefüge und Porenfreiheit erhalten und außerdem ein gutes Formfüllungsvermögen erreicht wird.The melt is cleaned, homogenized and degassed by flushing the molten metal with an inert gas. Rinsing is the last stage of treatment before the melt is poured. The gas purging lance is lowered manually or mechanically into the crucible and the melt is flushed with an inert gas for about 5 to 10 minutes. The rinsing treatment improves the quality of the castings, namely that they have a dense structure and freedom from pores and also a good form filler may be achieved.
Die Gasspüllanzen besitzen Spülköpfe aus porösen Materialien. Da die Lanzen den hohen Temperaturen der Metallschmelzen ausgesetzt werden, ist ihre Lebensdauer naturgemäß gering. Dies gilt auch für Gasspüllanzen mit Spülköpfen aus porösem Grafit, obwohl Grafit ein temperaturfester Werkstoff ist und auch das Lanzenrohr aus Grafit gefertigt werden kann. Die Haltbarkeit von Grafitlanzen ist aber dennoch gering, da der Grafit nach aem Einsatz in der Schmelze infolge des Luftsauerstoffs ausbrennt.The gas purging lances have flushing heads made of porous materials. Since the lances are exposed to the high temperatures of the molten metal, their lifespan is naturally short. This applies üllanzen p for Gass with rinsing heads of porous graphite, although graphite is a temperature-resistant material and the lance tube can be made of graphite. The durability of graphite lances is nevertheless low, since the graphite burns out after being used in the melt due to atmospheric oxygen.
Der Erfindung liegt die Aufgabe zugrunde, die Haltbarkeit derartiger Grafitlanzen zu vergrößern, indem das Ausbrennen des Grafits nach dem Einsatz in der Schmelze verhindert wird.The object of the invention is to increase the durability of such graphite lances by preventing the graphite from burning out after use in the melt.
Es wurde nun ein Verfahren zur Erhöhung der Lebensdauer von Gasspüllanzen mit porösen Spülköpfen aus Grafit für Nichteisen-Metallschmelzen gefunden, bei dem gemäß der Erfindung die Lanze unmittelbar nach dem Spülen in einem Inertisierungskäfig, der die aus Grafit bestehenden Teile der Lanze unter Ausbildung eines Spaltes umgibt, mit einem Inertgas solange durchströmt wird, bis die Zündtemperatur von Grafit unterschritten ist.A method has now been found for increasing the service life of gas purging lances with porous graphite purging heads for non-ferrous metal melts, in which, according to the invention, the lance immediately after purging in an inerting cage which surrounds the graphite parts of the lance to form a gap with an inert gas until the ignition temperature of graphite falls below.
Als Inertgas zum Durchströmen der Lanze zwecks Kühlung wird Stickstoff bevorzugt. Der Inertisierungskäfig zur Durchführung des erfindungsgemäßen Verfahrens besteht vorzugsweise aus zwei Halbschalen, die sich der Form der aus Grafit bestehenden Teile der Lanze unter Ausbildung eines engen Spaltes anpassen. Der Spalt soll dabei möglichst eng gehalten werden, da dann höhere Gasgeschwindigkeiten erreicht werden, wodurch sich die Lanze schneller abkühlt. Die Halbschalen können durch ein Scharnier gelenkig miteinander verbunden und im zusammengeklappten Zustand miteinander verriegelbar ausgeführt werden. Dies ermöglicht ein besonders schnelles Einlegen der Lanze in den Inertisierungskäfig nach dem Einsatz in der Schmelze. Bei einer vorteilhaften Ausführungsform der Erfindung wird der Inertisierungskäfig lösbar auf dem Flaschenwagen installiert, auf dem die Gasflasche mit dem Spülgas transportiert wird, so daß sich ein einheitliches Arbeitsgerät ergibt.Nitrogen is preferred as the inert gas for flowing through the lance for cooling. The inerting cage for carrying out the method according to the invention preferably consists of two half-shells which adapt to the shape of the graphite parts of the lance, forming a narrow gap. The gap should be kept as narrow as possible, since then higher gas velocities are reached, which means that the lance cools down faster. The half-shells can be ge by a hinge connected in an articulated manner and lockable in the folded state. This enables the lance to be inserted particularly quickly into the inerting cage after use in the melt. In an advantageous embodiment of the invention, the inerting cage is detachably installed on the bottle wagon on which the gas bottle is transported with the purge gas, so that a uniform implement is obtained.
Ein Ausführungsbeispiel der Erfindung soll anhand der beigefügten Zeichnungen erläutert werden.An embodiment of the invention will be explained with reference to the accompanying drawings.
Es zeigen:
- Fig.1 einen Schnitt durch einen Spülkopf und einen Teil des angeschlossenen Lanzenrohres, umgeben von einem Inertisierungskäfig,
- Fig.2 einen Schnitt entlang der Linie A-A in Fig.1,
- Fig.3 die Lanze mit Inertisierungskäfig nach den Fig.1 und 2 auf einem Flaschenwagen installiert.
- 1 shows a section through a flushing head and part of the connected lance tube, surrounded by an inerting cage,
- 2 shows a section along the line AA in FIG. 1,
- 3 the lance with inerting cage according to FIGS. 1 and 2 installed on a bottle wagon.
Fig.1 zeigt den Spülkopf 1 aus porösem Grafit einer Gasspüllanze. Der Spülkopf 1 ist auf dem Lanzenrohr 2 befestigt, welches vorzugsweise auch aus Grafit besteht. Erfindungsgemäß ist der Spülkopf 1 und das Lanzenrohr 2 von einem Inertisierungskäfig umgeben, der aus zwei Halbschalen 3,4 besteht. Die Halbschalen 3,4 sind durch ein Scharnier 5 gelenkig miteinander verbunden. An die Halbschale 3 ist ein Teller angeschweißt, der im geschlossenen Zustand den Boden des Käfigs darstellt. Die Halbschalen 3,4 sind so geformt, daß sie im geschlossenen Zustand den Spülkopf 1 und das Lanzenrohr 2 unter Ausbildung eines engen Spaltes 6 umgeben und so den Inertisierungskäfig bilden. Fig.2 zeigt die Vorrichtung im Querschnitt.1 shows the flushing
Fig.3 zeigt die Vorrichtung nach den Fig.1 und 2 mittels einer Schraubverbindung lösbar installiert auf einem Flaschenwagen 7. Auf dem Flaschenwagen 7 ist die Druckgasflasche 8 befestigt, die das Spülgas für die Metallschmelze, beispielsweise Argon, enthält. Ferner ist eine zweite Druckgasflasche 9 vorgesehen, die den Stickstoff für die Kühlung und Inertisierung der Lanze enthält.3 shows the device according to FIGS. 1 and 2 detachably installed on a bottle trolley 7 by means of a screw connection. The compressed gas bottle 8, which contains the purge gas for the molten metal, for example argon, is fastened on the bottle trolley 7. Furthermore, a second compressed
Im Betrieb strömt das Argon aus der Flasche 8 über den Druckminderer mit Durchflußmesser 10, den Druckgasschlauch 11 und das Lanzenrohr 2 und den Spülkopf 1 in die Metallschmelze, beispielsweise Aluminium. Nach dem Einsatz der Gasspüllanze in der Schmelze wird diese schnell auf den Teller 12 gestellt und in die Halbschale 3 eingelegt. Dann wird die Halbschale 4 auf die Halbschale 3 geklappt und beide Halbschalen werden mittels des Riegels 13 fest miteinander verbunden.In operation, the argon flows out of the bottle 8 through the pressure reducer with
Die Argonzufuhr wird nun unterbrochen und stattdessen die Stickstoffzufuhr zum Kühlen und Inertisieren freigegeben. Der Stickstoff strömt aus der Druckgasflasche 9 über den Druckminderer mit Durchflußmesser 14 und das T-Stück 15 in den Druckgasschlauch 11. Danach gelangt er aus dem Spülkopf 1 durch den engen Spalt 6 entlang des Lanzenrohres 2 nach außen. Hierdurch wird der Zutritt von Luftsauerstoff zum Grafit und damit das Ausbrennen des Grafits verhindert. Gleichzeitig wird der Spülkopf 1 und das Lanzenrohr 2 durch die hohe Gasgeschwindigkeit im engen Spalt 6 schnell abgekühlt, so daß bald die Zündtemperatur von Grafit unterschritten wird. Dann wird die Inertgaszufuhr unterbrochen und die Lanze kann gefahrlos aus dem Inertisierungskäfig entnommen werden. Infolge der schnellen Abkühlung von Spülkopf 1 und Lanzenrohr 2 ist der Inertgasverbrauch gering.The argon supply is now interrupted and instead the nitrogen supply is released for cooling and inerting. The nitrogen flows from the
Claims (5)
dadurch gekennzeichnet,
daß die Lanze unmittelbar nach dem Spülen in einem Inertisierungskäfig,der die aus Grafit bestehenden Teile der Lanze unter Ausbildung eines Spaltes (6) umgibt, mit einem Inertgas solange durchströmt wird, bis die Zündtemperatur von Grafit unterschritten ist.1. Process for increasing the life of gas purging lances with porous graphite purging heads for non-ferrous metal melts,
characterized,
that the lance is flowed through with an inert gas until after the flushing in an inerting cage which surrounds the graphite parts of the lance to form a gap (6) until the ignition temperature of graphite has fallen below.
dadurch gekennzeichnet,
daß die Lanze von Stickstoff durchströmt wird.2. The method according to claim 1,
characterized,
that nitrogen is flowing through the lance.
dadurch gekennzeichnet,
daß er aus zwei Halbschalen (3,4) besteht, die sich der Form der aus Grafit bestehenden Teile der Lanze unter Ausbildung eines engen Spaltes (6) anpassen.3. inerting cage for performing the method according to claims 1 or 2,
characterized,
that it consists of two half-shells (3, 4) which adapt to the shape of the graphite parts of the lance to form a narrow gap (6).
dadurch gekennzeichnet,
daß die Halbschalen (3,4) durch ein Scharnier (5) gelenkig miteinander verbunden und im zusammengeklappten Zustand miteinander verriegelbar (13) sind.4. inerting cage according to claim 3,
characterized,
that the half-shells (3, 4) are connected to one another in an articulated manner by a hinge (5) and can be locked together (13) in the folded state.
dadurch gekennzeichnet,
daß er auf einem Flaschenwagen (7) auf dem die Druckflasche (8) mit dem Spülgas transportiert wird, lösbar installiert ist. MG 11415. inerting cage according to claim 3 or 4,
characterized,
that it is detachably installed on a bottle trolley (7) on which the pressure bottle (8) is transported with the purge gas. MG 1141
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2827403 | 1978-06-22 | ||
| DE2827403A DE2827403C2 (en) | 1978-06-22 | 1978-06-22 | Device to increase the service life of gas primers with a porous graphite rinsing head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0006453A1 true EP0006453A1 (en) | 1980-01-09 |
| EP0006453B1 EP0006453B1 (en) | 1981-06-03 |
Family
ID=6042463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP79101605A Expired EP0006453B1 (en) | 1978-06-22 | 1979-05-25 | Process for increasing the lifetime of flush gas lances with porous lance heads made of graphite and inertion cage used therefor |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4264057A (en) |
| EP (1) | EP0006453B1 (en) |
| JP (1) | JPS552798A (en) |
| AT (1) | AT377208B (en) |
| DE (1) | DE2827403C2 (en) |
| ES (1) | ES481712A1 (en) |
| ZA (1) | ZA793085B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29818006U1 (en) * | 1998-10-08 | 1999-03-11 | Carbon Industrie-Produkte GmbH, 53567 Buchholz | Gas introduction system for melting baths |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU33708A1 (en) * | ||||
| US3503597A (en) * | 1967-02-20 | 1970-03-31 | Kessler Harry Harvey | Metal treating device |
| US3521874A (en) * | 1967-05-12 | 1970-07-28 | Reynolds Metals Co | Gas diffuser unit for use in treating molten metal |
| FR2263308A1 (en) * | 1974-03-08 | 1975-10-03 | Combustible Nucleaire | Purification of molten uranium to prevent axial fissures - occurring in continuous casting, by washing the melt with inert gas |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3112194A (en) * | 1960-10-19 | 1963-11-26 | Union Carbide Corp | Molten bath treating method and apparatus |
| US3304173A (en) * | 1961-07-27 | 1967-02-14 | United States Steel Corp | Method of adding solids and oxygen to an open hearth furnace |
| NL296346A (en) * | 1962-08-07 | |||
| US3269829A (en) * | 1963-09-24 | 1966-08-30 | United States Steel Corp | Method and apparatus for introducing steam and oxygen into a bath of molten steel |
| US3932172A (en) * | 1969-02-20 | 1976-01-13 | Eisenwerk-Gesellschaft Maximilianshutte Mbh | Method and converter for refining pig-iron into steel |
-
1978
- 1978-06-22 DE DE2827403A patent/DE2827403C2/en not_active Expired
-
1979
- 1979-05-25 EP EP79101605A patent/EP0006453B1/en not_active Expired
- 1979-05-28 AT AT0388479A patent/AT377208B/en not_active IP Right Cessation
- 1979-06-08 US US06/046,780 patent/US4264057A/en not_active Expired - Lifetime
- 1979-06-11 JP JP7245079A patent/JPS552798A/en active Pending
- 1979-06-20 ES ES481712A patent/ES481712A1/en not_active Expired
- 1979-06-21 ZA ZA793085A patent/ZA793085B/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU33708A1 (en) * | ||||
| US3503597A (en) * | 1967-02-20 | 1970-03-31 | Kessler Harry Harvey | Metal treating device |
| US3521874A (en) * | 1967-05-12 | 1970-07-28 | Reynolds Metals Co | Gas diffuser unit for use in treating molten metal |
| FR2263308A1 (en) * | 1974-03-08 | 1975-10-03 | Combustible Nucleaire | Purification of molten uranium to prevent axial fissures - occurring in continuous casting, by washing the melt with inert gas |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0006453B1 (en) | 1981-06-03 |
| US4264057A (en) | 1981-04-28 |
| ZA793085B (en) | 1980-08-27 |
| ATA388479A (en) | 1984-07-15 |
| DE2827403B1 (en) | 1979-08-02 |
| JPS552798A (en) | 1980-01-10 |
| AT377208B (en) | 1985-02-25 |
| DE2827403C2 (en) | 1980-04-03 |
| ES481712A1 (en) | 1980-02-16 |
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