EP0949339B1 - RH-Vakuumverfahren mit Massenumlaufratesteuerung zur Reduzierung des Kohlenstoffgehalts einer Stahlschmelze - Google Patents
RH-Vakuumverfahren mit Massenumlaufratesteuerung zur Reduzierung des Kohlenstoffgehalts einer Stahlschmelze Download PDFInfo
- Publication number
- EP0949339B1 EP0949339B1 EP99105806A EP99105806A EP0949339B1 EP 0949339 B1 EP0949339 B1 EP 0949339B1 EP 99105806 A EP99105806 A EP 99105806A EP 99105806 A EP99105806 A EP 99105806A EP 0949339 B1 EP0949339 B1 EP 0949339B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- melt
- steel melt
- treatment
- carbon content
- steel
- 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
-
- 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
Definitions
- the invention relates to a method for treating a Melting steel, in which the melt with a negative pressure is applied, which is generated in a vacuum chamber to which a riser and a downpipe are connected which are in a pan that holds the molten steel dive, in which in the case of negative pressure in the Steel tube present a molten gas is injected to circulate the molten steel from the pan over the riser pipe into the vacuum chamber and from to force it back into the pan over the downpipe, and wherein during the ascent of the molten steel in Riser tube reaction gas is generated, which in the Vacuum chamber as well as the conveying gas essentially completely outgassed from the molten steel.
- the method used is, for example, in "Using the RH process for the production of ultra-low carbon steels at Thyssen Stahl AG ", Thyssen Technical Reports, issue 1/90.
- the carbon monoxide thus formed in the riser carries in addition to driving the melt.
- the Formation rate of the resulting CO gas depending on the current carbon or oxygen content of the Melt. This leads to the carbon monoxide stream in the In the course of the treatment the molten steel decreases until finally no such reaction gas from the Outgassing melt.
- reaction gas generated in the riser occurs in the Vacuum chamber together with the conveying gas essentially completely from the molten steel. Through the downpipe therefore flows essentially one of gas fractions completely freed molten steel back to the pan.
- the object of the invention is a method to create the type mentioned above, with the Knowledge of the respective decarburization state of the Melting steel more precise control of the treatment a molten steel is possible.
- the invention is based on the idea that the density the melt in the riser pipe because of the blown into it Conveying gas and the reaction gas generated in it is less than the density of the melt, which in the Down pipe freed of gas components flows back. Outgoing From this consideration, the force or. Pressure difference determined, which is the circulation of the Melting steel causes.
- the invention thus establishes a based on an analysis of the actual circumstances, of the respective blown-in gas flow and of each resulting reaction gas flow dependent computing model to disposal. This calculation model enables the "Driving force" by which the melt during its Circulation is driven to a high degree to determine realistically.
- the decarburization process determines the point in time at which the treatment of the molten steel is ended. To this The purpose is that with each run of the sequence of steps a) - c) newly determined carbon content with a limit value compared. The achievement of this represents a clear one Criterion for the decision is treatment break up.
- the volume flow in the riser blown gas equal to that Conveying gas volume flow set at which the during running through the sequence of steps a) - c) in each case determined mass flow of the circulating steel melt Maximum.
- the analytical determination of the mass flow according to the invention of the steel melt based on the differential force and in Dependence on the blown gas flow and changing in the course of treatment Reaction gas flow show that based on the respective processing progress more optimal Production gas flow exists, if it is exceeded a worsening of the treatment outcome sets.
- By always blowing in the conveyed gas flow Agreement with the determined optimal Gas volume flow is brought is also an optimal Mass flow of molten steel reached. compare to practical experience has shown that according to the Invention given delivery gas volume flows exactly with those known from practical experience Conveying gas flows match, in which in the Practice setting optimal treatment results.
- the accuracy of the determination of the differential force and / or the determination of the mass flow of the circulating Steel smelting can be additionally increased as a result, that takes into account changes in vacuum that occur during the treatment period.
- Such deviations from the specified target value of the Negative pressure occur for example at the beginning of the Treatment on if the vacuum chamber is not in the is sufficiently evacuated.
- Embodiment of the invention is characterized in that when determining the differential force by the wear occurring during the treatment period conditional changes in the geometry of the Mass flow of the molten steel during one cycle flowed through components, such as riser and downpipe, be taken into account.
- Wear of the refractory lining of the Components flowing through the melt ensure that the essential, changing through wear Influencing factors in the analytical determination of the Differential force, such as the diameter of the Riser and downpipe, always on the respective actual wear condition can be adjusted.
- it has proven useful to adapt the respective state of wear between individual Carry out treatment cycles within which one Melt batch the treatment completely goes through.
- the differential force can be determined in that a horizontal plane the compressive force, which from the in Standpipe standing column of molten steel and Conveying gas based on the cross-sectional area of the Riser is exercised compared to the pressure force is that of the standing in the downpipe Steel melt column based on the cross-sectional area the downpipe is exercised.
- This consideration can taking into account the respective hydrostatic Pressures to be performed. A more precise result results however, if in addition to the hydrostatic Pressure component also the flow-related dynamic Pressure component is taken into account.
- the first is preferably used when determining the pressures Balance limit in the area of transition from case and Riser pipe placed in the vacuum container while the second balance limit for riser and downpipe at the level of Inlet nozzles of the riser pipe is arranged.
- the device 1 for decarburizing a molten steel S has a pan 2 and a vacuum chamber 3.
- pumps 4 are provided which generate a vacuum P VK within the vacuum chamber 3.
- the vacuum P VK is not constant during the decarburization treatment, since at the beginning of the treatment there is ambient pressure in the vacuum chamber 3 and the pumps 4 lower it to the vacuum P VK depending on their output.
- a riser pipe 5 and a down pipe 6 open, which dip into the pan 2 with their free end.
- the melt S Upon action of the melt S with the negative pressure P VK the melt S initially rises uniformly through the riser pipe 5 and the drop tube 6 in the vacuum chamber 3, wherein a height of the melt level is adjusted accordingly in the vacuum chamber 3 to the existing negative pressure P VK.
- a conveying gas volume flow V ⁇ FG can be blown into the riser pipe 5 via nozzles 8 via a conveying gas line 7 opening in the region of the free end of the riser pipe 5.
- Argon for example, is used as the conveying gas.
- a mass flow M ⁇ St of the steel melt begins from the pan 2 via the riser pipe 5 into the vacuum chamber 3 and from there via the down pipe 6 back into the pan 2 to circulate.
- a carbon monoxide flow V co arises in the riser pipe 5 depending on the respective carbon C and the oxygen content O of the melt S and on the negative pressure in the vacuum chamber 3.
- This gas flow created by the chemical reaction in addition to the conveying gas flow causes an increase in the driving force responsible for the steel circulation.
- the size of the conveying gas volume flow V FG is set by a control and monitoring device 9, which includes a keyboard 10 or other input devices that are suitable for entering data C 0 , C e , O 0 , V, R, a screen 11 or others devices suitable for outputting process variables C, O, t and a computing unit 12.
- the control and monitoring unit 9 controls and monitors starting from the initial values of the carbon content C 0 of the melt before the decarburization treatment, the desired carbon content C e after the decarburization treatment, the initial oxygen content O 0 before the decarburization treatment, the volume V of the melt S and the geometry parameters R.
- a pressure difference ⁇ P of the pressure forces P1, P2 exerted by the melt columns A1, A2 in relation to the respective cross section of the riser pipe 5 or the downpipe 6 is determined. It is taken into account that the cross sections of the riser pipe 5 and the down pipe 6 become larger due to increasing wear during the treatment.
- the calculation model is adapted to the respective state of wear at regular intervals, the length of which corresponds to one or more treatment cycles.
- a force balance is then drawn up to determine the mass flow M ⁇ St , in which the pressure difference ⁇ P is compared with the sum of the pressure losses during the course of the circulation of the mass flow M ⁇ St.
- a conveying gas volume flow V ⁇ FGopt is then determined, for which a maximum of the mass flow M ⁇ Stmax of the steel melt S results.
- step S0 the initial data C 0 , C e , O 0 , V, R are first entered into the control and monitoring device 9 by an operator and the process variables carbon content C and oxygen content O equal to the corresponding initial conditions C 0 and O 0 as well the start time t is set (step S1).
- step S2 the current pressure P VK in the vacuum chamber 3 is queried.
- the conveying gas flow V ⁇ FGopt is then determined in step S3, as explained above, in which there is a maximum mass flow M ⁇ Stmax .
- the control and monitoring device 9 sets the delivery gas volume flow V ⁇ FG blown into the riser pipe 5 equal to the determined optimal delivery gas volume flow V ⁇ FGopt (step S4).
- step S5 after the above Calculation model for the decarburization kinetics the current Process variable representing carbon content C. updated. According to the decrease in Carbon content C is also the Representing the oxygen content O of the melt S. Process variable adjusted.
- step S6 is checked by the control and monitoring device 9 in step if the carbon content C determined is above the desired carbon content C e. If this is the case, the decarburization treatment is continued.
- the control and monitoring device jumps back to step S2 in order to go through steps S2-S6 of the control and monitoring process again.
- step S7 If, on the other hand, the carbon content C has reached the desired carbon content C e , the decarburization treatment is ended (step S7).
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Description
- Fig. 1
- eine Vorrichtung zur Entkohlungsbehandlung einer Stahlschmelze im Schnitt;
- Fig. 2
- ein den Ablauf der Steuerung während der Entkohlungsbehandlung wiedergebendes Flußdiagramm;
- Fig. 3
- ein Diagramm, in welchem der Massenstrom der Stahlschmelze über dem Fördergasstrom für eine unverschlissene und eine verschlissene Vorrichtung gemäß Fig. 1 aufgetragen ist.
- C0 =
- Kohlenstoffgehalt zu Beginn der Behandlung,
- t =
- Behandlungsdauer,
- K =
- Reaktionskonstante.
Claims (7)
- Verfahren zum Behandeln einer Stahlschmelze (S), bei dem die Schmelze (S) mit einem Unterdruck (PVK) beaufschlagt wird, der in einer Vakuumkammer (3) erzeugt wird, an die ein Steig- (5) und ein Fallrohr (6) angeschlossen sind, welche in eine die Stahlschmelze (S) aufnehmende Pfanne (2) tauchen, wobei in die bei Unterdruckbeaufschlagung in dem Steigrohr (5) anwesende Stahlschmelze (S) ein Fördergas eingeblasen wird, um einen Umlauf (MSt) der Stahlschmelze (S) von der Pfanne (2) über das Steigrohr (5) in die Vakuumkammer (3) und von dort über das Fallrohr (6) zurück in die Pfanne (2) zu erzwingen, und wobei während des Aufstiegs der Stahlschmelze (S) im Steigrohr (5) Reaktionsgas entsteht, welches in der Vakuumkammer (3) ebenso wie das Fördergas im wesentlichen vollständig aus der Stahlschmelze (2) ausgast, dadurch gekennzeichnet, daß ausgehend von den zu Beginn der Behandlung vorhandenen Sauerstoff- (O) und Kohlenstoffgehalten (C) der Stahlschmelze (S) die folgenden Schritte durchlaufen werden:a) Ermittlung einer den Umlauf (M ˙St) der Stahlschmelze bewirkenden Differenzkraft auf Grundlage der wegen des eingeblasenen Fördergasstroms (V ˙FG) und des sich bildenden Reaktionsgasstroms (V ˙CO) unterschiedlichen Drücke der im Steigrohr (5) und der im Fallrohr (6) anwesenden Stahlschmelze (S),b) Ermittlung des umlaufenden Massenstroms (M ˙St) der Stahlschmelze (S) auf Grundlage der Differenzkraft;c) Ermittlung der Abnahme des Sauerstoff- (O) und Kohlenstoffgehalts (C) der Stahlschmelze (S) während der Behandlungsdauer (t) unter Verwendung eines Rechenmodells für die Entkohlungskinetik,d) Wiederholen der Schrittfolge a) - c) für den Fall, daß der ermittelte Kohlenstoffgehalt (C) größer als ein Grenzwert (Ce) ist,e) Beenden der Behandlung für den Fall, daß der ermittelte Kohlenstoffgehalt (C) nicht größer als der Grenzwert (Ce) ist.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Volumenstrom (V ˙FG) des in das Steigrohr (5) eingeblasenen Fördergases gleich demjenigen Fördergasvolumenstrom (V ˙FGopt) eingestellt wird, bei dem der während des Durchlaufs der Schrittfolge a) - c) jeweils ermittelte Massenstrom (M ˙St) der umlaufenden Stahlschmelze (S) ein Maximum (M ˙Stmax) aufweist.
- Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet, daß bei der Ermittlung der Differenzkraft und/oder bei der Ermittlung des Massenstroms der umlaufenden Stahlschmelze (S) Änderungen des Unterdrucks (PVK) berücksichtigt werden, die sich während der Behandlungsdauer (t) einstellen. - Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet, daß innerhalb des Rechenmodels für die Entkohlungskinetik das Gewicht oder Volumen (V) der Schmelze (S), der im vorhergehenden Durchlauf der Schrittfolge a) - c) ermittelte Kohlenstoffgehalt (C), der Massenstrom (M ˙St) der umlaufenden Schmelze (S) und die Behandlungsdauer (t) berücksichtigt werden. - Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet, daß bei der Ermittlung der Differenzkraft die durch den während der Behandlungsdauer (t) eintretenden Verschleiß bedingten Änderungen der Geometrie der von dem Massenstrom (MSt) der Stahlschmelze (S) während eines Umlaufs durchströmten Bauteile, wie Steigrohr und Fallrohr, berücksichtigt werden. - Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet, daß bei der Ermittlung der Differenzkraft die Druckkraft (P1), welche von der im Steigrohr (5) stehenden Gemischsäule (A1) aus Stahlschmelze und Fördergas bezogen auf die Querschnittsfläche des Steigrohrs (5) ausgeübt wird, mit der Druckkraft (P2) verglichen wird, die von der im Fallrohr (6) stehenden Stahlschmelzensäule (A2) in der gleichen Horizontalebene bezogen auf die Querschnittsfläche des Fallrohres (6) ausgeübt wird. - Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet, daß
bei der Ermittlung des umlaufenden Massenstroms (M ˙St) der Stahlschmelze (S) die strömungsmechanisch und strömungstechnisch bedingten Verluste berücksichtigt werden.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19815298A DE19815298C2 (de) | 1998-04-06 | 1998-04-06 | Verfahren zur Reduzierung des Kohlenstoffgehalts einer Stahlschmelze |
DE19815298 | 1998-04-06 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0949339A1 EP0949339A1 (de) | 1999-10-13 |
EP0949339B1 true EP0949339B1 (de) | 2001-05-30 |
Family
ID=7863705
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99105806A Expired - Lifetime EP0949339B1 (de) | 1998-04-06 | 1999-03-23 | RH-Vakuumverfahren mit Massenumlaufratesteuerung zur Reduzierung des Kohlenstoffgehalts einer Stahlschmelze |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0949339B1 (de) |
AT (1) | ATE201717T1 (de) |
DE (2) | DE19815298C2 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2469101C1 (ru) * | 2011-07-26 | 2012-12-10 | Общество С Ограниченной Ответственностью "Группа "Магнезит" | Способ ремонта футеровки патрубка вакууматора |
RU2557046C2 (ru) * | 2013-09-23 | 2015-07-20 | Корвинтек Юэроп Лимитед | Патрубок погружной для вакууматора |
RU2776656C1 (ru) * | 2022-03-10 | 2022-07-22 | Акционерное общество "ЕВРАЗ Нижнетагильский металлургический комбинат" (АО "ЕВРАЗ НТМК") | Футеровка нижней части вакуум-камеры |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106191381B (zh) * | 2016-08-31 | 2018-02-16 | 山东钢铁股份有限公司 | 一种在RH工位快速脱除炉渣中FeO的方法 |
RU2736127C1 (ru) * | 2019-12-10 | 2020-11-11 | Акционерное общество «ЕВРАЗ Нижнетагильский металлургический комбинат» (АО «ЕВРАЗ НТМК») | Патрубок погружной для циркуляционного вакууматора |
CN117230281B (zh) * | 2023-11-14 | 2024-01-23 | 山西同航特钢有限公司 | 一种高磷if钢的生产工艺 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1569158A (en) * | 1976-11-30 | 1980-06-11 | Nippon Steel Corp | Methods of and apparatus for vacuum refining molten steel |
JPS55141515A (en) * | 1979-04-18 | 1980-11-05 | Kawasaki Steel Corp | Vacuum degassing method of molten steel |
JPS5811721A (ja) * | 1981-07-16 | 1983-01-22 | Kawasaki Steel Corp | 溶鋼の真空精錬方法 |
SU1557175A1 (ru) * | 1988-07-26 | 1990-04-15 | Предприятие П/Я А-3681 | Способ управлени дегазацией жидкой стали в струе |
JPH03134114A (ja) * | 1989-10-17 | 1991-06-07 | Sumitomo Metal Ind Ltd | Rh精錬の溶鋼中炭素濃度推定方法 |
JPH05311226A (ja) * | 1992-05-07 | 1993-11-22 | Nippon Steel Corp | 溶融金属の減圧・真空脱ガス精錬方法 |
-
1998
- 1998-04-06 DE DE19815298A patent/DE19815298C2/de not_active Expired - Fee Related
-
1999
- 1999-03-23 EP EP99105806A patent/EP0949339B1/de not_active Expired - Lifetime
- 1999-03-23 AT AT99105806T patent/ATE201717T1/de not_active IP Right Cessation
- 1999-03-23 DE DE59900106T patent/DE59900106D1/de not_active Expired - Fee Related
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2469101C1 (ru) * | 2011-07-26 | 2012-12-10 | Общество С Ограниченной Ответственностью "Группа "Магнезит" | Способ ремонта футеровки патрубка вакууматора |
RU2557046C2 (ru) * | 2013-09-23 | 2015-07-20 | Корвинтек Юэроп Лимитед | Патрубок погружной для вакууматора |
RU2776656C1 (ru) * | 2022-03-10 | 2022-07-22 | Акционерное общество "ЕВРАЗ Нижнетагильский металлургический комбинат" (АО "ЕВРАЗ НТМК") | Футеровка нижней части вакуум-камеры |
RU2778653C1 (ru) * | 2022-03-10 | 2022-08-22 | Акционерное общество "ЕВРАЗ Нижнетагильский металлургический комбинат" (АО "ЕВРАЗ НТМК") | Вакуум-камера с погружными патрубками |
Also Published As
Publication number | Publication date |
---|---|
DE19815298A1 (de) | 1999-10-07 |
ATE201717T1 (de) | 2001-06-15 |
DE59900106D1 (de) | 2001-07-05 |
DE19815298C2 (de) | 2000-05-31 |
EP0949339A1 (de) | 1999-10-13 |
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