DE1458963B1 - Application of a vacuum treatment of freshly prepared LD steel for the preparation of silicon-free and aluminum-free deep-drawing steel suitable for continuous casting, as well as a device for carrying out the process - Google Patents
Application of a vacuum treatment of freshly prepared LD steel for the preparation of silicon-free and aluminum-free deep-drawing steel suitable for continuous casting, as well as a device for carrying out the processInfo
- Publication number
- DE1458963B1 DE1458963B1 DE19651458963D DE1458963DA DE1458963B1 DE 1458963 B1 DE1458963 B1 DE 1458963B1 DE 19651458963 D DE19651458963 D DE 19651458963D DE 1458963D A DE1458963D A DE 1458963DA DE 1458963 B1 DE1458963 B1 DE 1458963B1
- Authority
- DE
- Germany
- Prior art keywords
- free
- steel
- aluminum
- vacuum treatment
- continuous casting
- 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.)
- Pending
Links
Classifications
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/32—Blowing from above
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
-
- 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
- C21C7/10—Handling in a vacuum
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/285—Plants therefor
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
Trotz weitgehender Entwicklung des Stranggießens ist es noch immer ein ungelöstes Problem, unberuhigte Schmelzen, die also siliziumfrei sind, im Strangguß einwandfrei zu vergießen. Schmelzen, die für Tiefziehbleche bestimmt sind, müssen vor dem Stranggießen beruhigt werden, und zwar mit Aluminium. Die Vollberuhigung mit Aluminium verbürgt jedoch keine einwandfreie Verarbeitung, weil die hohen Aluminiumgehalte im Stahl Gießschwierigkeiten auf der Stranggießanlage und Oberflächenfehler am Strang zur Folge haben.Despite the extensive development of continuous casting, it is still an unsolved problem, unsettled Melts, which are therefore silicon-free, can be cast perfectly in continuous casting. Melting that for Deep-drawn sheets are intended to be calmed before continuous casting, with aluminum. However, complete calming with aluminum does not guarantee perfect workmanship, because the high Aluminum content in steel Casting difficulties on the continuous caster and surface defects on the Strand entail.
Es ist bereits bekannt, Stahl durch eine Vakuum- oder Unterdruckbehandlung zu entgasen und anschließend im Strang zu vergießen. Hierbei wurde der Stahl vor der Anlegung des Vakuums sorgfältig abgeschlackt, weil man befürchtete, daß der Stahl durch die Schlacke rückoxydiert werden könnte.It is already known to degas steel by a vacuum or negative pressure treatment and then to shed in the strand. The steel was carefully slagged off before the vacuum was applied, because it was feared that the steel could be reoxidized by the slag.
Bei diesem bekannten Verfahren ergibt sich die Schwierigkeit, daß durch die Abschlackarbeit große Zeit- und Temperaturverluste auftreten, weil der flüssige, abgeschlackte Stahl nicht mehr kocht: der ferrostatische Druck wirkt einer vollständigen Entgasung entgegen; auch bei Umlegen des Frisch- bzw. Schmelzbehälters und dadurch Vermindern des ferrostatischen Drucks wird eine nur geringfügige Entgasungswirkung erzielt.In this known method, the problem arises that large by the deslagging Time and temperature losses occur because the liquid, deslagged steel no longer boils: the ferrostatic pressure counteracts complete degassing; even when the fresh or Melting container and thereby reducing the ferrostatic pressure is only a minor degassing effect achieved.
Die Erfindung bezweckt die Vermeidung dieser Nachteile und Schwierigkeiten und besteht in der Anwendung einer Vakuumbehandlung von fertiggefrischtem LD-Stahl innerhalb des Frischgefäßes zur Vorbereitung von für das Stranggießen geeigneten siliziumfreiem und aluminiumfreiem Stahl, mit dt Maßgabe, daß die Vakuumbehandlung in Gegenwar der Endschlacke des Frischprozesses durchgeführ wird.The invention aims to avoid these disadvantages and difficulties and consists in application a vacuum treatment of freshly refurbished LD steel inside the fresh vessel Preparation of silicon-free and aluminum-free steel suitable for continuous casting, with dt Provided that the vacuum treatment is carried out in the presence of the final slag of the refining process will.
Es wurde gefunden, daß im Gegensatz zur frühere: Meinung die Gefahr einer Rückoxydation von fertig gefrischtem LD-Stahl mit der weiteren Folge, daß de Phosphorgehalt des Stahls ansteigt, nicht gegeben is" bei den normalerweise im LD-Tiegel angewendete hochbasischen Schlacken ist eine Rückphosphorun nicht zu befürchten. Gegenüber den bekannten Ve fahren, bei denen die Endschlacke vor der Entgasur, abgezogen wird, erreicht man jedoch erfindungsgi maß den wesentlichen Vorteil, daß durch die Ank gung des Vakuums in Gegenwart der Endschlack eine gegenüber dem Frischen nochmalige stark Durchmischung des Stahls und der Schlacke b gleichzeitiger lebhafter Gasentwicklung erfolgt, s daß neben dem Entgasungseffekt in kurzer Zeit ei Ausreagieren zwischen Schlacke und Stahl erreicl wird.It was found that in contrast to the earlier: opinion the risk of reoxidation of finished refurbished low-density steel with the further consequence that the phosphorus content of the steel increases, is not given " The highly basic slag normally used in the LD crucible is a reverse phosphorus not to fear. Compared to the well-known Ve, in which the final slag before the degassing, is deducted, however, achieved according to the invention the essential advantage that the Ank The increase in the vacuum in the presence of the final slag is another strong increase compared to the fresh Mixing of the steel and the slag b simultaneous vigorous evolution of gas takes place, see Sect that, in addition to the degassing effect, reaction between slag and steel is achieved in a short time will.
Durch die erfindungsgemäße Behandlung erfolgt i sehr kurzer Zeit zwischen Stahl und Schlacke ein Gleichgewichtseinstellung und ein Konzentration:· ausgleich. Ein in dieser Weise behandelter Stahl is wegen seiner Gasarmut und des Freiseins von Des Oxydationsmitteln in besonderer Weise für das Vergk ßen im Strang geeignet; ein Temperaturabfall tritt fader erfindungsgemäßen Behandlung nicht auf. The treatment according to the invention results in a very short time between steel and slag Balance and concentration: · balance. Steel treated in this way is because of its lack of gas and the absence of oxidizing agents in a special way for the Vergk ßen suitable in strand; a temperature drop does not occur with the treatment according to the invention.
Die Erfindung umfaßt weiters eine Vorrichtung zi Durchführung des beschriebenen Verfahrens, m einem kippbaren Konverter, der in der vertikale Blasstellung an eine Kaminhaube und in einer Kipp stellung an eine Evakuierungsleitung anschließbar is welche Vorrichtung dadurch gekennzeichnet ist, da der Konverter in einer Schrägstellung oberhalb de Horizontalen mittels eines gekühlten Mundringes a ein ringförmiges Dichtungsglied der Evakuierungsie: tung anschließbar ist. Zweckmäßig besitzen der ge kühlte Mundring und das ringförmige Dichtungsglie konische Dichtflächen.The invention further comprises a device zi Implementation of the method described, m a tiltable converter, which is in the vertical The blowing position can be connected to a chimney hood and in a tilting position to an evacuation line which device is characterized in that the converter is in an inclined position above de Horizontal by means of a cooled mouth ring a an annular sealing member of the evacuation unit: device can be connected. Appropriately have the ge cooled mouth ring and the annular sealing member conical sealing surfaces.
Die erfindungsgemäße Vorrichtung ist in de Zeichnung schematisch dargestellt. In dieser bedei: ten 1 den Konverter und 2 den zugehörigen Kamir mit 3 ist die Rohrleitung zur Evakuierungsapparatu bezeichnet, die in einem ringförmigen Dichtgüed endigt, welches in der dargestellten Ausführungsforr. mit einem gekühlten Mundring 5 am Konverter zu sammenwirkt. Der gekühlte Mundring 5 und da ringförmige Dichtglied 4 besitzen konische Dichtflä chen. Es ist jedoch klar, daß auch andere Möglichkei ten der Dichtung zwischen Konvertermund und Eva kuierungsleitung bestehen, wie sie etwa bei der Ge winnung der Konverterabgase in unverbranntem Zu stand gebräuchlich sind, wobei jedoch bedacht wer den muß, daß hier größere Druckunterschiede bewäl tigt werden müssen.The device according to the invention is shown schematically in the drawing. In this case: th 1 the converter and 2 the associated Kamir with 3 is the pipeline to the evacuation apparatus referred to, which ends in an annular sealing material, which in the illustrated Ausführungsforr. cooperates with a cooled mouth ring 5 on the converter. The cooled mouth ring 5 and there annular sealing member 4 have conical sealing surfaces. It is clear, however, that there are other possibilities ten of the seal between the converter mouth and evacuation line exist, as is the case with the Ge recovery of the converter exhaust gases in unburned condition are common, but whoever is careful the must that larger pressure differences must be taken over here.
Hierzu 1 Blatt Zeichnungen BAD OF-IOiKALFor this 1 sheet of drawings BAD OF-IOiKAL
COPVCOPV
Claims (3)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT819264A AT269194B (en) | 1964-09-25 | 1964-09-25 | Vacuum treatment of fully refurbished LD steel for the preparation of silicon and aluminum-free steel suitable for continuous casting as well as a device for implementation |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1458963B1 true DE1458963B1 (en) | 1972-06-29 |
Family
ID=3603345
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19651458963D Pending DE1458963B1 (en) | 1964-09-25 | 1965-09-16 | Application of a vacuum treatment of freshly prepared LD steel for the preparation of silicon-free and aluminum-free deep-drawing steel suitable for continuous casting, as well as a device for carrying out the process |
Country Status (4)
Country | Link |
---|---|
AT (1) | AT269194B (en) |
DE (1) | DE1458963B1 (en) |
GB (1) | GB1116958A (en) |
SE (1) | SE311372B (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR796451A (en) * | 1934-11-23 | 1936-04-07 | Wacker Chemie Gmbh | Method and device for decarburizing metals |
DE687720C (en) * | 1934-12-02 | 1940-02-05 | Wacker Chemie Gmbh | Tiltable device for treating melts made of metals and alloys with gases under vacuum |
FR1187996A (en) * | 1958-10-14 | 1959-09-17 | Siderurgie Fse Inst Rech | Method and device for vacuum steel treatment |
DE1166228B (en) * | 1960-11-22 | 1964-03-26 | Demag Ag | Laterally movable suction hood for degassing molten steel by means of negative pressure in the inflation converter after refining |
-
1964
- 1964-09-25 AT AT819264A patent/AT269194B/en active
-
1965
- 1965-09-16 DE DE19651458963D patent/DE1458963B1/en active Pending
- 1965-09-21 SE SE12239/65A patent/SE311372B/xx unknown
- 1965-09-22 GB GB40462/65A patent/GB1116958A/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR796451A (en) * | 1934-11-23 | 1936-04-07 | Wacker Chemie Gmbh | Method and device for decarburizing metals |
DE687720C (en) * | 1934-12-02 | 1940-02-05 | Wacker Chemie Gmbh | Tiltable device for treating melts made of metals and alloys with gases under vacuum |
FR1187996A (en) * | 1958-10-14 | 1959-09-17 | Siderurgie Fse Inst Rech | Method and device for vacuum steel treatment |
DE1166228B (en) * | 1960-11-22 | 1964-03-26 | Demag Ag | Laterally movable suction hood for degassing molten steel by means of negative pressure in the inflation converter after refining |
Also Published As
Publication number | Publication date |
---|---|
AT269194B (en) | 1969-03-10 |
SE311372B (en) | 1969-06-09 |
GB1116958A (en) | 1968-06-12 |
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