EP0721990A1 - Procédé pour la production d'aciers alliés - Google Patents

Procédé pour la production d'aciers alliés Download PDF

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Publication number
EP0721990A1
EP0721990A1 EP96890007A EP96890007A EP0721990A1 EP 0721990 A1 EP0721990 A1 EP 0721990A1 EP 96890007 A EP96890007 A EP 96890007A EP 96890007 A EP96890007 A EP 96890007A EP 0721990 A1 EP0721990 A1 EP 0721990A1
Authority
EP
European Patent Office
Prior art keywords
oxygen
melt
during
electric furnace
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.)
Granted
Application number
EP96890007A
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German (de)
English (en)
Other versions
EP0721990B1 (fr
Inventor
Ernst Dipl.-Ing. Fritz
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.)
VAI Technometal GmbH
Original Assignee
KCT Technologies 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 KCT Technologies GmbH filed Critical KCT Technologies GmbH
Publication of EP0721990A1 publication Critical patent/EP0721990A1/fr
Application granted granted Critical
Publication of EP0721990B1 publication Critical patent/EP0721990B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5264—Manufacture of alloyed steels including ferro-alloys
    • 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
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5252—Manufacture of steel in electric furnaces in an electrically heated multi-chamber furnace, a combination of electric furnaces or an electric furnace arranged for associated working with a non electric furnace
    • 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
    • C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
    • 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
    • C21C7/068—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
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C2007/0093—Duplex process; Two stage processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S75/00—Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures
    • Y10S75/961—Treating flue dust to obtain metal other than by consolidation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S75/00—Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures
    • Y10S75/962—Treating or using mill scale

Definitions

  • the invention relates to a method for producing alloy steels, in particular stainless steels or steel raw material for stainless steels, in which iron carriers are largely decarburized and dephosphorized with the aid of oxygen in a first production step and the melt after removal of the slag formed in a further production step after supply of alloy carriers is adjusted to the desired alloy and carbon content with the aid of oxygen and inert gas, and a plant for carrying out the process.
  • a method of this type is known from EP-A2 - 0 229 586. Both manufacturing steps are carried out in one and the same oxygen blowing converter. With this method, one is severely limited with regard to the charging of solids to be melted. Solid pig iron, alloying agents and scrap can be brought into the oxygen blowing converter in a maximum amount of 20% by weight of a batch. If you want to charge large quantities of solids, you are forced to add expensive exothermic chemical heating agents, but this entails the disadvantage of large quantities of slag (SiO 2 , Al 2 O 3 etc.). These large amounts of slag require high amounts of lime, and as a result there is a large loss of output of iron, chromium, manganese, etc.
  • the oxygen blowing converter has a floor flushing device in order to generate a melt bath movement.
  • this leads to high chromium slagging, so that the economy of the known method is no longer ensured.
  • the economically acceptable lower limit (with still portable chrome slagging) for the carbon content is 0.2% C.
  • the lowest carbon contents e.g. less than 0.1% carbon cannot be set.
  • the invention aims to avoid these disadvantages and difficulties and has as its object to provide a method of the type described above and an installation for carrying out the method, which make it possible to produce alloy steels, in particular stainless steels, economically and with high productivity.
  • a bath movement is preferably initiated during the further manufacturing step in order to achieve high reaction speeds for the desilification, decarburization, dissolving of high-carbon ferrochrome, etc. by introducing gas into the melt, preferably with a minimum quantity of 30 liters / min per point of introduction when introducing inert gas and 300 liters / min when introducing oxygen or mixed gases containing oxygen.
  • decarburization is carried out at least during a sub-step of the further production step by blowing under bath with oxygen or an oxygen-containing mixed gas, as a result of which it is possible to keep the chrome slagging particularly low at a high decarburization rate.
  • decarburization it is also possible for decarburization to be carried out by blowing oxygen or an oxygen-containing mixed gas onto the melt during the further production step.
  • the oxygen or the oxygen-containing mixed gas is mixed with an increasing proportion of inert gas as the duration of the underbath blowing increases
  • a preferred embodiment is characterized in that the first manufacturing step is carried out in a first electric furnace and the further manufacturing step is carried out in a further electric oven different from the first electric oven.
  • the introduction of the batch into a second electric furnace in order to carry out the further production step enables the melt to be kept free of phosphorus-containing slag which, despite being slagged off, still adheres to the brick lining in the first electric furnace. This results in an almost complete dephosphorization of the melt, so that the further production step, namely the alloy adjustment and further decarburization, can be carried out in the absence of phosphorus.
  • a flushing of the melt with inert gas or a mixture of inert gas and hydrocarbon is advantageously carried out during at least one sub-step of the further production step.
  • This can be done, for example, with blowing nozzles arranged just above the normal melt level in the wall of the electric furnace, which come to rest below the melt surface during a tilting process. As a result, these blowing nozzles lie above the melt (and slag) when not in use, so that their service life is extended
  • the metal yield is preferably increased and the consumption of reducing agent is reduced if the further production step is carried out with the greatest possible absence of air.
  • the economical avoidance of the penetration of false air, particularly during the reduction of the slag and / or deoxidation of the melt, is achieved by the slag door and the separation point between the furnace wall and the furnace cover, e.g. is sealed with the help of ceramic fibers.
  • the method according to the invention is particularly advantageous if more than 20% by weight, preferably more than 40% by weight, of the batch of scrap is formed by the iron carriers.
  • the further production step is expediently carried out while leaving a subset of the slag from the further production step that took place before the further production step.
  • the slag containing Cr 2 O 3 which comes from the previous batch in the second electric furnace and which is formed by the partial oxidation of the silicon from the ferrochrome and the added lime etc., is primarily reduced by silicon and carbon from the ferrochrome and can be slagged off with high chrome output and minimal consumption of reducing agent, such as FeSi, before the fine decarburization in the electric furnace.
  • the slag is preferably reduced during the further production step during a purging process with inert gas with the addition of reducing agent, lime and flux, and the melt is deoxidized and desulfurized, so that in the further production step the final carbon content already required for the respective steel quality, the remaining chemical analysis and the desired one Temperature of the melt can be achieved.
  • solids such as, for example, electric furnace or converter dust, coal for slag foaming, slag formers, ores, fine-grained alloying agents, materials that need to be disposed of, such as sewage sludge, granular shredder light fraction, Grinding dust, scale, etc.
  • fine-grained ore such as chrome ore as Cr and oxygen carrier (for Si oxidation) without or with mixing with reducing agent (eg FeSi, coal) and / or coal or nickel oxide are blown onto the arcs and onto the melt.
  • a system for carrying out the method is characterized by at least one electric furnace with blowing lances arranged above the normal melt level and penetrating the side wall of the furnace, and with under bath nozzles provided in the lower part of the stove.
  • the lower bath nozzles are expediently designed as jacket nozzles, hydrocarbon and / or mixtures of hydrocarbon and inert gas and / or CO 2 and / or water vapor being able to be fed through the jacket.
  • the blowing lances provided above the normal molten bath level are designed as fresh lances, which are arranged on the side wall of the furnace so that they can pivot and move longitudinally.
  • FIGS. 1 and 2 each illustrating an electric furnace in cross section in a schematic representation.
  • An electric furnace 1 provided for the first manufacturing step has three sub-bath nozzles 4 in the refractory lining 2 of the lower part 3 of the stove, as shown in FIG.
  • the lower bath nozzles 4 are nozzles which are formed from two or three concentric tubes - in the manner of jacket nozzles - the process gas flowing in the inner round central tube and protective gas for the nozzles flowing in the annular or circular blow cross sections between the tubes.
  • the protective gas is preferably hydrocarbon , such as propane, butane or a mixture of hydrocarbon and inert gas. However, water vapor, CO 2 , light heating oil, CO, inert gas or mixtures thereof have also been successfully used as a protective medium.
  • Annular gap nozzles which were filled with refractory material in the central tube and in which the process gas was introduced through an interrupted annular gap, could also be successfully used as an under bath nozzle 4.
  • three rinsing elements 6 are arranged, each consisting of two tubes.
  • the inner tube is sealed with refractory material.
  • the annular gaps can also be formed from circular sections.
  • the flushing elements 6 can also be formed from porous, sheet-metal-coated or thin tubes provided with refractory material.
  • stationary fresh lances 9 are attached in the side wall 8 of the furnace.
  • These fresh lances 9 are formed from two or three concentric tubes or from a water-cooled tube.
  • the direction of the arrow 10 indicates that the fresh lances blow obliquely downward as a tangent to an imaginary cylinder and at a relatively short distance from the bath surface 11.
  • the fresh lances 9 are inserted into water-cooled copper cooling boxes 12.
  • one of the three electrodes 13 is shown as a hollow electrode.
  • Three post-combustion / burner lances 14 are arranged in the upper part of the furnace side wall 8. An opening 15 is used to add slag formers and alloying agents.
  • FIG. 2 A second schematically illustrated electric furnace 16 according to the invention is illustrated in FIG. 2.
  • a special feature - in contrast to the electric furnace 1 shown in FIG. 1 - it has an exchangeable base part 17 in which the three flushing elements 6 are provided.
  • An electrode 13 is designed as a hollow electrode which is lined with a ceramic tube. Alloying agents are introduced into the furnace (second electric furnace) through the opening 15 of the furnace cover 18 using a scrap basket (not shown). Seals 19 are formed at the separation point of the furnace side wall 8 to the furnace cover 18, slag door 20 to the furnace side wall 8 and at the opening 15 in the furnace cover 18 made of ceramic fiber. The furnace cover 18 is pressed against the furnace side wall 8 at least temporarily with a tensioning device.
  • the gas consumption per ton of liquid steel is determined as follows:
  • Fresh lances 9 are charged with 15 Nm 3 O 2 / t and the under bath nozzles 4 with 8 Nm 3 O 2 / t and 1.1 Nm 3 CH 4 / t.
  • the flushing elements 6 blow 1.2 Nm 3 N 2 plus 0.3 Nm 3 CH 4 / t to improve the bath movement and the application.
  • the electricity consumption on the electric furnace is 1 130 kWh / t of the liquid steel end product (from the second electric furnace). 50 kg of slag are slagged. 680 kg of premelt with 0.20% C, 0.020% P and 1590 ° C are passed on to the second electric furnace 16.
  • the tapping sequence time is 57 min.
  • the fresh lances 9 apply 20 Nm 3 O 2 to the melt, 5 Nm 3 O 2 through self-consuming pipes and 4 8 Nm 3 O 2 + 2 Nm 3 Ar + 1 Nm 3 CH 4 through the under bath nozzles blown into the melt.
  • the entry of false air into the second electric furnace 16 is largely prevented (the furnace cover 18 is clamped against the furnace side wall 8).
  • 125 kg of slag are largely reduced and deslagged with the silicon from the HCFeCr and the carbon.
  • the melt in the second electric furnace 16 is blown to 0.04% C by blowing the O 2 + Ar / CH 4 + Ar with the aid of the under bath nozzles 4, and the slag is reduced during the inert gas blowing and addition of FeSi and lime , the melt desulphurized, emptied, finely alloyed, rinsed and poured after an intermediate deslagging and another lime batching.
  • the treatment time in the second electric furnace 16 is approximately 70 minutes.
  • the dephosphorization of pig iron and scrap iron, recycled materials, FeNi etc. is carried out in the first electric furnace 1.
  • the slag containing P 2 O 5 is removed from the plant, ie the electric furnace 1, before this largely decarburized premelt is charged, alloyed, desilicated and decarburized in the second electric furnace 16.
  • Brief decarburization, deoxidation, desulphurization and rinsing can be carried out in a vacuum system (e.g. VOD system).
  • Decarburization with the lowest chrome slagging to medium or lowest carbon contents is made possible with stationary underbath nozzles 4 and / or 6 which blow with mixed gases containing oxygen to reduce the CO partial pressure and partly with stationary and / or movable inflating nozzles 9 or lances.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Analytical Chemistry (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)
EP96890007A 1995-01-16 1996-01-11 Procédé pour l'élaboration d'aciers alliés et installation de four électrique à arc incluyant des lances de soufflage positionables pour sa mise en oeuvre Expired - Lifetime EP0721990B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0005595A AT403293B (de) 1995-01-16 1995-01-16 Verfahren und anlage zum herstellen von legierten stählen
AT5595 1995-01-16
AT55/95 1995-01-16

Publications (2)

Publication Number Publication Date
EP0721990A1 true EP0721990A1 (fr) 1996-07-17
EP0721990B1 EP0721990B1 (fr) 2001-02-28

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EP96890007A Expired - Lifetime EP0721990B1 (fr) 1995-01-16 1996-01-11 Procédé pour l'élaboration d'aciers alliés et installation de four électrique à arc incluyant des lances de soufflage positionables pour sa mise en oeuvre

Country Status (11)

Country Link
US (1) US6077324A (fr)
EP (1) EP0721990B1 (fr)
JP (1) JP4195106B2 (fr)
KR (1) KR960029466A (fr)
CN (1) CN1134984A (fr)
AT (1) AT403293B (fr)
BR (1) BR9600097A (fr)
DE (1) DE59606475D1 (fr)
TR (1) TR199600032A2 (fr)
TW (1) TW363081B (fr)
ZA (1) ZA96281B (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998048228A1 (fr) * 1997-04-24 1998-10-29 Paul Wurth S.A. Procede de fusion d'alliages a base de fer dans un four electrique
LU90232B1 (fr) * 1998-04-08 1999-10-11 Wurth Paul Sa Procédé de fabrication d'aciers inoxydables et d'aciers à fortes teneurs en elements d'alliage
WO2002033130A1 (fr) * 2000-10-18 2002-04-25 Sms Demag Aktiengesellschaft Procede pour produire des aciers inoxydables, notamment des aciers speciaux au chrome et au chrome-nickel
WO2003074741A1 (fr) * 2002-03-05 2003-09-12 Sms Demag Aktiengesellschaft Procede de production d'aciers inoxydables, en particulier d'aciers speciaux au chrome ou au chrome-nickel
WO2003085141A1 (fr) * 2002-04-10 2003-10-16 Sms Demag Aktiengesellschaft Procede et dispositif pour produire des aciers c ou des aciers inoxydables par affinage de fonte riche en phosphore dans un four a arc electrique ou dans un recipient convertisseur
CZ303288B6 (cs) * 1999-06-23 2012-07-18 Sms Siemag Aktiengesellschaft Zpusob zpetného získávání kovového chrómu ze strusek, obsahujících oxidy chrómu
DE102022101835A1 (de) 2022-01-26 2023-07-27 Rhm Rohstoff-Handelsgesellschaft Mbh Verfahren zum Verwerten von Bauteilen, die kohlenstofffaserverstärkten Kunststoff (CFK) aufweisen oder aus diesem bestehen

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AT405054B (de) * 1997-06-18 1999-05-25 Voest Alpine Ind Anlagen Verfahren und anlage zum herstellen einer eisenschmelze unter einsatz von eisenhältigen hüttenwerksreststoffen
US6500224B1 (en) * 2001-10-11 2002-12-31 Bethlehem Steel Corporation Method for operating a steelmaking furnace during a steelmaking process
AT412349B (de) * 2003-06-25 2005-01-25 Voest Alpine Ind Anlagen Verfahren zur herstellung einer legierten metallschmelze und erzeugungsanlage hierzu
KR100987049B1 (ko) * 2003-06-26 2010-10-11 두산중공업 주식회사 개선된 고크롬강 제조 방법
DE102010036174A1 (de) 2010-05-04 2011-11-10 Georg-Simon-Ohm Hochschule für angewandte Wissenschaften Fachhochschule Nürnberg Optischer Drehübertrager
EP2589672A1 (fr) * 2011-11-03 2013-05-08 Siemens Aktiengesellschaft Procédé destiné au fonctionnement d'un four à arc lumineux
CN107326150B (zh) * 2017-06-16 2018-04-03 北京科技大学 一种全废钢电弧炉双联冶炼洁净钢的生产方法
US10767239B2 (en) 2017-06-16 2020-09-08 University Of Science And Technology Beijing Production method for smelting clean steel from full-scrap steel using duplex electric arc furnaces
RU2697305C1 (ru) * 2018-01-09 2019-08-13 Игорь Михайлович Шатохин Технологическая линия для производства композиционных ферросплавов, лигатур и бескислородных огнеупорных материалов для металлургии
JP7094264B2 (ja) * 2019-12-25 2022-07-01 株式会社神戸製鋼所 溶鋼の製造方法
CN115989324A (zh) 2020-09-10 2023-04-18 杰富意钢铁株式会社 低磷铁液的制造方法
CN112974738A (zh) * 2021-04-23 2021-06-18 北京科技大学 连铸微合金化生产方法
WO2022249797A1 (fr) 2021-05-26 2022-12-01 Ｊｆｅスチール株式会社 Procédé de déphosphoration de métal fondu
CN116479234A (zh) * 2023-04-26 2023-07-25 上海逢石科技有限公司 一种利用复合炉直接处理红土镍矿生产镍铁的方法
KR102793112B1 (ko) * 2023-07-07 2025-04-07 현대제철 주식회사 전기로 질소 혼입 저감장치 및 이를 포함하는 전기로

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WO1998048228A1 (fr) * 1997-04-24 1998-10-29 Paul Wurth S.A. Procede de fusion d'alliages a base de fer dans un four electrique
LU90232B1 (fr) * 1998-04-08 1999-10-11 Wurth Paul Sa Procédé de fabrication d'aciers inoxydables et d'aciers à fortes teneurs en elements d'alliage
WO1999053105A1 (fr) * 1998-04-08 1999-10-21 Paul Wurth S.A. Fabrication d'aciers inoxydables et d'aciers a fortes teneurs en elements d'alliage dans un four electrique comprenant deux zones distinctes
CZ303288B6 (cs) * 1999-06-23 2012-07-18 Sms Siemag Aktiengesellschaft Zpusob zpetného získávání kovového chrómu ze strusek, obsahujících oxidy chrómu
WO2002033130A1 (fr) * 2000-10-18 2002-04-25 Sms Demag Aktiengesellschaft Procede pour produire des aciers inoxydables, notamment des aciers speciaux au chrome et au chrome-nickel
US7094271B2 (en) 2000-10-18 2006-08-22 Sms Demag Ag Method for producing stainless steels, in particular high-grade steels containing chromium and chromium-nickel
KR100819126B1 (ko) 2000-10-18 2008-04-02 에스엠에스 데마그 악티엔게젤샤프트 스테인리스 강, 특히 크롬 및 크롬/니켈을 함유한 고급강의 제조 방법
CZ299403B6 (cs) * 2000-10-18 2008-07-16 Sms Demag Ag Zpusob výroby nerezavejících ocelí, predevším ušlechtilých ocelí s obsahem chrómu a s obsahem chrómu a niklu
WO2003074741A1 (fr) * 2002-03-05 2003-09-12 Sms Demag Aktiengesellschaft Procede de production d'aciers inoxydables, en particulier d'aciers speciaux au chrome ou au chrome-nickel
WO2003085141A1 (fr) * 2002-04-10 2003-10-16 Sms Demag Aktiengesellschaft Procede et dispositif pour produire des aciers c ou des aciers inoxydables par affinage de fonte riche en phosphore dans un four a arc electrique ou dans un recipient convertisseur
DE102022101835A1 (de) 2022-01-26 2023-07-27 Rhm Rohstoff-Handelsgesellschaft Mbh Verfahren zum Verwerten von Bauteilen, die kohlenstofffaserverstärkten Kunststoff (CFK) aufweisen oder aus diesem bestehen
EP4219035A1 (fr) 2022-01-26 2023-08-02 RHM Rohstoff-Handelsgesellschaft mbH Procédé de recyclage de composants comprenant des plastiques renforcés par des fibres de carbone (cfk) ou constitués de ceux-ci
DE102022101835B4 (de) 2022-01-26 2024-02-22 Rhm Rohstoff-Handelsgesellschaft Mbh Verfahren zum Verwerten von Bauteilen, die kohlenstofffaserverstärkten Kunststoff (CFK) aufweisen oder aus diesem bestehen

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DE59606475D1 (de) 2001-04-05
JP4195106B2 (ja) 2008-12-10
CN1134984A (zh) 1996-11-06
US6077324A (en) 2000-06-20
KR960029466A (ko) 1996-08-17
ATA5595A (de) 1997-05-15
BR9600097A (pt) 1998-01-27
EP0721990B1 (fr) 2001-02-28
TR199600032A2 (tr) 1996-08-21
ZA96281B (en) 1996-07-31
TW363081B (en) 1999-07-01
AT403293B (de) 1997-12-29

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