EP1764421A2 - Dispositif de décarburation d'une fonte d'acier - Google Patents

Dispositif de décarburation d'une fonte d'acier Download PDF

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Publication number
EP1764421A2
EP1764421A2 EP06020935A EP06020935A EP1764421A2 EP 1764421 A2 EP1764421 A2 EP 1764421A2 EP 06020935 A EP06020935 A EP 06020935A EP 06020935 A EP06020935 A EP 06020935A EP 1764421 A2 EP1764421 A2 EP 1764421A2
Authority
EP
European Patent Office
Prior art keywords
molten steel
lance
decarburization
oxygen
blowing
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.)
Withdrawn
Application number
EP06020935A
Other languages
German (de)
English (en)
Other versions
EP1764421A3 (fr
Inventor
Johannes Dr. Mueller
Johannes Spiess
Yuyou Dr. Zhai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Primetals Technologies Austria GmbH
Original Assignee
Voest Alpine Industrienlagenbau GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voest Alpine Industrienlagenbau GmbH filed Critical Voest Alpine Industrienlagenbau GmbH
Publication of EP1764421A2 publication Critical patent/EP1764421A2/fr
Publication of EP1764421A3 publication Critical patent/EP1764421A3/fr
Withdrawn legal-status Critical Current

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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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/068—Decarburising
    • C21C7/0685—Decarburising of stainless steel
    • 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
    • C21C5/005—Manufacture of stainless steel
    • 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
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/35—Blowing from above and through the bath
    • 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
    • C21C5/4606—Lances or injectors
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/068—Decarburising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • 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

Definitions

  • the invention relates to a device for decarburizing a molten steel in the course of the production of stainless steel in a metallurgical vessel, in particular in a converter, wherein the molten steel is treated with oxygen and optionally an inert gas, in particular argon and / or nitrogen.
  • a method for decarburizing a molten steel in particular by the AOD method, it is known to carry out decarburization by means of an oxygen blowing process above a carbon content of essentially 0.3% by weight in the molten steel, using a corresponding top lance. Below 0.3 wt% carbon content in molten steel, decarburization is continued by the operation of submerged nozzles. However, the operation of the lower bath nozzles is generally followed by insufficient mixing of the molten steel. Furthermore, there is a high ferrostatic pressure in the area of the lower bath nozzles, which has a negative effect on the decarburization.
  • Laval nozzles By Laval nozzles high flow rates can be realized in technically and economically efficient form. Since a slag layer normally floats on the molten steel, the flow rate of the gas stream directed to the same for treating the molten steel is of crucial importance. Only a high gas velocity, as it is particularly preferably achievable by use of a Laval nozzle, guarantees the contact of the gas stream, in particular the oxygen with the molten steel, and thus a sufficient mixing and decarburization of the molten steel. A major disadvantage of the use of Laval nozzles arises in terms of controllability of the flow rate of oxygen, which varies depending on the carbon content in the molten steel during the blowing process.
  • the present invention has for its object to avoid the disadvantages of the prior art and to develop a device according to the preamble of claim 1, whereby a particularly economical and efficient decarburization of molten steel can be realized.
  • the inflator has at least two blow lances, each with at least one Laval nozzle, wherein the Laval nozzles of the different blow lances differ by different design with respect to the flow rate, and the lances are used independently for decarburization of the molten steel.
  • a particularly economical and efficient decarburization of molten steel is thus realized when above a carbon content of 0.3 wt%, oxygen in the molten steel by a lance equipped with a first Laval nozzle with a flow rate D1 and below a carbon content of 0.3 wt% in the molten steel oxygen is blown through a blow lance equipped with a second Laval nozzle with a flow rate D2, whereby D2 ⁇ D1, is blown onto the molten steel.
  • a particular measure for implementing the invention is that in the decarburization of the molten steel below a carbon content of 0.3 wt.%
  • oxygen and optionally inert gas, in particular argon and / or nitrogen, via an opening below the surface of the molten steel and via an above the surface of the molten steel arranged inflator is brought into contact with the molten steel.
  • the majority of the oxygen introduced through the inflator and the opening below the surface of the molten steel is in contact with the molten steel via the inflator brought.
  • the present invention relates to a device for the combined top and bottom injection of O 2 and / or inert gas in a metal vessel for the purpose of decarburizing a molten metal, in particular a molten steel, wherein the required O 2 amount mainly by one or blown several top lances, and the required adjustment of the O 2 - and / or inert gas blowing intensity by the change of the lance configuration during operation, ideally by arranging and operating a second lance is realized.
  • the second lance is designed for a lower blowing intensity or flow rate.
  • the specific blowing rate of the second lance is set to a value in the range of 0.5 to 1 Nm 3 / (t * min).
  • the lance used on the lance head on a Laval nozzle on a Laval nozzle.
  • oxygen and / or inert gas is blown onto the molten metal by the second top lance.
  • the second lance is operated at low C content in the melt with a lower blowing intensity.
  • the mixing ratio between oxygen and inert gas with which the molten metal is applied during the process is adjusted in accordance with the actual C content of the melt.
  • the critical C content (starting point for the use of the second lance) depends above all on the process conditions, in particular the chemical composition and the temperature of the molten metal, and / or other thermochemical conditions.
  • the working position and the blowing rate of the lances used are adjusted accordingly during the operation of the decarburization process.
  • the dimensions of the Unterbaddüsen are smaller interpretable with sufficient bath mixing than is the case in known from the prior art method.
  • an oxygen / inert gas mixture in particular with a blowing rate of 0.1 to 0.3 Nm3 / (t * min), is introduced to keep the nozzles free in the area of the subbubble nozzles.
  • the Unterbaddüsen are arranged on the bottom or on the side wall of the metallurgical vessel.
  • the Unterbaddüsen are designed as classic nozzles and / or flushing stones.
  • top lance is used during a first process step for decarburization.
  • the top lance is switched off and the further decarburization is continued by blowing in oxygen and optionally inert gas via one or more submerged nozzles.
  • the duration of use of the lance is accordingly approximately 15-25% of the total process time.
  • This reaction is strongly influenced by the CO partial pressure.
  • the CO partial pressure is suppressed by introducing inert gas (Ar / N 2 ) into the molten steel.
  • the decarburization condition in the lower bath nozzle is less favorable because of the ferrostatic pressure over the lower bath nozzles. It is therefore proposed to support the further decarburization by blowing (top-blowing) and to intensify the mixing.
  • inert gas for example, it would be possible to add a certain amount of inert gas to the 0 2 to be introduced via the lance, whereby the amount of gas required for the operation of the laval nozzle of the lance can be provided.
  • the Inertgas mecanicischung is limited in a given by the process requirement area to minimize the inert gas consumption, in particular the Ar / N 2 consumption.
  • the entire gas flow through the lance is to be selected so that a high Lanzenkopf- and / or nozzle wear is avoided, and a high utilization of the injected gas is ensured.
  • the invention relates to an apparatus for decarburization in a refractory material lined vessel, which is preferably in converter form, in the metal manufacturing industry, preferably in the steel and stainless steel producing industry.
  • the device according to the invention on the one hand, the optimum mixing occurring in combined Blowing (Top + Bottom) in a corresponding vessel, in particular a converter, and thus also an improved C-transport for CO formation, and on the other hand in the Inflation (top-lance-blowing) lower CO partial pressure, and thus exploited compared to bottom-blowing thus more favorable decarburization condition.
  • blowing of a treatment gas below the surface of the molten metal is referred to as bottom-blowing.
  • blowing of treatment gas onto the surface of the molten metal is referred to as top blowing.
  • the decarburization is divided into a metal vessel in two process stages.
  • the first stage during which oxygen addition determines the rate of chemical evolution, decarburization at higher C content occurs through combined top and bottom blow, thus minimizing the amount of gas introduced into the metal bath through the bottom nozzles is that a laying of the floor nozzles is prevented.
  • a second process stage below a critical C content in the bath which, for example in the case of chromium-containing melts, is between 0.3-0.4% by weight of carbon in the molten steel, the mass transfer process taking place within the scope of the decarburization determines the reaction rate.
  • the O 2 bubble intensity is reduced accordingly.
  • the required amount of O 2 is mainly blown through the top lance, preferably with the addition of inert gas.
  • the design of the lance head (with a Laval nozzle) being accurate is configured for the requirements in this phase.
  • the lance used during the first bubble stage can be changed by mechanical adaptation (switching or conversion) so that the required blowing intensity and the required gas jet character can be fulfilled.
  • the mixing ratios between O 2 and inert gas through the second lance are adjusted during decarburization depending on the C content.
  • the underbath nozzles are subjected to an O 2 / inert gas mixture in order to prevent any misplacement or obstruction of the nozzles and to ensure optimum bath mixing.
  • a reduction phase can follow, with the inert gas being injected through the underbath nozzles and / or top lance.
  • the Laval nozzle has a mechanical and / or electromagnetic device for changing the characteristic of the Laval nozzle in terms of set characteristic flow rate, for example, by changing the cross section of the nozzle on.
  • a first lance is used in the decarburization up to a carbon content of 0.3% by weight in the molten steel. Subsequently, a second lance is used to inflate an Ar / N 2 / O 2 mixture.
  • FIG. 1 an apparatus for decarburizing a molten steel is shown by the AOD method.
  • the apparatus 1 in this case has a metallurgical vessel 2, in particular a converter, in which a molten steel 3, in particular a melt of a, preferably chromium-rich, stainless steel is located. On the molten steel 3 floats a slag 4.
  • the molten steel 3 is treated by bottom nozzles 5 with a treatment gas, which generally contains oxygen and optionally an inert gas, in particular with one or more of the gases: oxygen, nitrogen, argon or air.
  • a treatment gas which generally contains oxygen and optionally an inert gas, in particular with one or more of the gases: oxygen, nitrogen, argon or air.
  • a first blowing lance 6 is operated, by means of which likewise a treatment gas, in particular oxygen or an oxygen-inert gas mixture, more preferably an oxygen-argon mixture, is brought into contact with the molten steel.
  • a treatment gas in particular oxygen or an oxygen-inert gas mixture, more preferably an oxygen-argon mixture
  • the treatment gas is brought into contact with the molten steel.
  • the slag is forced back. This ensures optimal contact of the treatment gas with the molten steel.
  • a sufficient intensity of the directed through the Laval nozzle of the lance on the molten metal gas stream also ensures good mixing in the vessel contained fluids.
  • a second lance 7 provided is not used in the first process step, which essentially corresponds to decarburization at a carbon content of more than 0.3% by weight.
  • a second process step 1 ' which corresponds to a decarburization at a carbon content preferably at or below 0.3% by weight in the molten steel
  • the steel melt 3' in the metallurgical vessel 2 ' is in turn fed via one or more bottom nozzles 5' a treatment gas
  • the second lance 7 ' is in operation in the second method step 1', which differs from the first lance 6 'in that this lance, which in turn is preferably equipped with a Laval nozzle, for a different, in particular smaller , Flow rate of treatment gas is designed.
  • the slag 4 ' is at least partially forced back by the operation of the lance 7' of the molten steel.
  • the lance 6 ' remains out of operation during the second process step.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Processing Of Solid Wastes (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
EP06020935A 2002-08-21 2003-07-15 Dispositif de décarburation d'une fonte d'acier Withdrawn EP1764421A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0125002A AT411530B (de) 2002-08-21 2002-08-21 Verfahren und vorrichtung zur entkohlung einer stahlschmelze
EP03792199A EP1530648B1 (fr) 2002-08-21 2003-07-15 Procedes et dispositif de decarburation d'une fonte d'acier

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP03792199A Division EP1530648B1 (fr) 2002-08-21 2003-07-15 Procedes et dispositif de decarburation d'une fonte d'acier

Publications (2)

Publication Number Publication Date
EP1764421A2 true EP1764421A2 (fr) 2007-03-21
EP1764421A3 EP1764421A3 (fr) 2007-12-26

Family

ID=3687818

Family Applications (2)

Application Number Title Priority Date Filing Date
EP03792199A Expired - Lifetime EP1530648B1 (fr) 2002-08-21 2003-07-15 Procedes et dispositif de decarburation d'une fonte d'acier
EP06020935A Withdrawn EP1764421A3 (fr) 2002-08-21 2003-07-15 Dispositif de décarburation d'une fonte d'acier

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP03792199A Expired - Lifetime EP1530648B1 (fr) 2002-08-21 2003-07-15 Procedes et dispositif de decarburation d'une fonte d'acier

Country Status (8)

Country Link
EP (2) EP1530648B1 (fr)
CN (1) CN100532581C (fr)
AT (2) AT411530B (fr)
AU (1) AU2003257462A1 (fr)
DE (1) DE50307383D1 (fr)
ES (1) ES2287557T3 (fr)
RU (1) RU2319750C2 (fr)
WO (1) WO2004018714A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2216110A3 (fr) * 2009-01-22 2017-02-08 SMS group GmbH Rinçage à impulsion doté de gaz inerte lors du processus de conversion BOF et AOD

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014222727A1 (de) * 2014-11-06 2016-05-12 Sms Group Gmbh Verfahren und Vorrichtung zur Erzeugung eines Rostfreistahls
WO2024100435A1 (fr) * 2022-11-10 2024-05-16 Arcelormittal Lance de post-combustion

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5540753A (en) 1994-07-27 1996-07-30 Nippon Steel Corporation Method for refining chromium-containing molten steel by decarburization

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT216032B (de) * 1959-02-20 1961-07-10 Arbed Vorrichtung zum Beblasen eines Metallbades von oben
NL6710354A (fr) * 1966-07-27 1968-01-29
JPS5589395A (en) * 1978-12-26 1980-07-05 Sumitomo Metal Ind Ltd Gasification of solid carbonaceous material and its device
JPS6040486B2 (ja) * 1979-07-03 1985-09-11 住友金属工業株式会社 鋼の精錬法
JPS6063307A (ja) * 1983-09-14 1985-04-11 Kawasaki Steel Corp 極低炭素鋼の転炉製鋼法
LU86322A1 (fr) * 1986-02-25 1987-09-10 Arbed Lance de soufflage d'oxygene
LU88023A1 (fr) * 1991-10-30 1993-05-17 Arbed Lance de soufflage
JPH06158142A (ja) * 1992-11-24 1994-06-07 Sumitomo Metal Ind Ltd 高クロム鋼の真空脱炭精錬装置
JP3167888B2 (ja) * 1995-07-27 2001-05-21 川崎製鉄株式会社 含クロム溶鋼の脱炭精錬方法及び精錬ガス用上吹ランス

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5540753A (en) 1994-07-27 1996-07-30 Nippon Steel Corporation Method for refining chromium-containing molten steel by decarburization

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2216110A3 (fr) * 2009-01-22 2017-02-08 SMS group GmbH Rinçage à impulsion doté de gaz inerte lors du processus de conversion BOF et AOD

Also Published As

Publication number Publication date
WO2004018714A1 (fr) 2004-03-04
AU2003257462A1 (en) 2004-03-11
EP1530648B1 (fr) 2007-05-30
RU2005107698A (ru) 2005-09-10
RU2319750C2 (ru) 2008-03-20
DE50307383D1 (de) 2007-07-12
ATA12502002A (de) 2003-07-15
EP1530648A1 (fr) 2005-05-18
CN1675383A (zh) 2005-09-28
ATE363546T1 (de) 2007-06-15
CN100532581C (zh) 2009-08-26
ES2287557T3 (es) 2007-12-16
EP1764421A3 (fr) 2007-12-26
AT411530B (de) 2004-02-25

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