EP2097505A1 - Procédé et dispositif pour produire de la fonte brute à base d'acier inoxydable sans utiliser d'alimentation électrique - Google Patents

Procédé et dispositif pour produire de la fonte brute à base d'acier inoxydable sans utiliser d'alimentation électrique

Info

Publication number
EP2097505A1
EP2097505A1 EP07856191A EP07856191A EP2097505A1 EP 2097505 A1 EP2097505 A1 EP 2097505A1 EP 07856191 A EP07856191 A EP 07856191A EP 07856191 A EP07856191 A EP 07856191A EP 2097505 A1 EP2097505 A1 EP 2097505A1
Authority
EP
European Patent Office
Prior art keywords
aod
converter
pig iron
twin
treatment
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
EP07856191A
Other languages
German (de)
English (en)
Other versions
EP2097505B1 (fr
Inventor
Johann Reichel
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.)
SMS Group GmbH
Original Assignee
SMS Siemag AG
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 SMS Siemag AG filed Critical SMS Siemag AG
Publication of EP2097505A1 publication Critical patent/EP2097505A1/fr
Application granted granted Critical
Publication of EP2097505B1 publication Critical patent/EP2097505B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • 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
    • 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
    • C21C7/06—Deoxidising, e.g. killing
    • 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
    • C21C2300/00—Process aspects
    • C21C2300/08—Particular sequence of the process steps

Definitions

  • the invention relates to a method and a device for the production of stainless steel without electric power supply on the basis of liquid pig iron and FeCr solids, wherein the molten pig iron after a pretreatment in the blast furnace and a DDD treatment (dephosphorization, desilication, desulfurization) in an AOD Converter heated, refined or alloyed, reduced and finally an adjustment / adjustment of the treated molten steel in a ladle furnace is performed.
  • a DDD treatment dephosphorization, desilication, desulfurization
  • Stainless steels of the ferritic steel group AISI 4xx are conventionally produced in principle from typical scrap in the EAF and later additionally alloyed and decarburized in the AOD converter.
  • pig iron pretreated in a steel mill is a scrap and alloy outside of the oven in a pan mixed and then charged in the converter.
  • the object of the invention is the method known from WO 2006/050963 A2 with AOD technology for direct charging of pig iron and alloying in the converter for stainless steel production of all stainless grades, such as AISI 3xx, 4xx, 2xx, both in the austenitic as well as in the ferritic range using autogenous chemical energy.
  • the stated object for the production of stainless steel number of said steel grade is achieved by the characterizing features of claim 1, characterized in that the stainless steel production of all stainless steel in both the austenitic and ferritic in the blast furnace pretreated slag-free liquid amount of pig iron and separated into two classic "Twin" AOD In the first twin AOD, the necessary chemical process steps (DDD treatment, charging and heating, decarburization and alloying) are carried out using parallel, countercurrent flow using autogenous chemical energy. First the DDD treatment is carried out in the converter and the decarburization is first carried out in the second Twin AOD-L converter.
  • the heating of the pig iron to a desired or required for the subsequent process steps temperature is carried out by Si oxidation.
  • FeSi is charged into the Twin AOD-L converter and oxygen / inert gas mixture is blown through the side nozzles and a top lance into and onto the pig iron.
  • the first Twin AOD-L converter uses a 3- or 4-hole top lance and the second Twin AOD-L converter uses a single-hole top lance.
  • the heating of the pre-metal is carried out according to the invention after the DDD treatment, it is possible, above all, to charge Ni or Ni alloys into the Twin AOD-L converters.
  • the balance energy can be designed in this way. Due to the contradictory sequence of the process steps carried out in both Twin AOD-L converters at different times, the decarburization and alloying of the melt takes place in the first Twin AOD-L converter after completion of the DDD treatment and charging and heating, while in the second Twin AOD-L Converter after completion of the decarburization and all associated treatment steps (such as desulfurization and alloying with parting off) the pig iron is heated.
  • the separation according to the invention of the pretreated slag-free molten pig iron quantity on two twin AOD-L converters arranged in parallel in the process line downstream of the blast furnace and the process steps carried out in a contrary manner makes it advantageously possible to produce all RST steel grades.
  • there is a decoupling of the demand for electrical energy for all qualities since only the energy already present in the raw iron or via the autogenous chemical energy introduced with the charged FeSi is used as the energy source.
  • a more reliable temperature control, reduced process costs and reduced investment costs are achieved by this separation of the amount of pig iron and the process control, since only smaller quantities of pig iron have to be treated.
  • Fig. 2 shows the contrary procedure in two Twin AOD-L converters.
  • FIG. 1 an exemplary method line for the production of stainless steel is shown in a drawing figure.
  • the liquid quantity of pig iron is separated after its exit from the blast furnace 1 and introduced into two twin AOD-L converters 2, 3 arranged downstream of the blast furnace 1.
  • the DDD treatment and the refining and alloying of the molten pig iron take place in a contrary sequence of process steps.
  • the molten steel from both Twin AOD-L converters is brought together in a ladle 4 and from there to the final adaptation / adjustment in the ladle furnace 5 and from there to the casting machine 6.
  • FIG. 2 shows the contrary sequence of the process steps carried out in the Twin AOD-L converters 2 and 3.
  • DDD treatment V7 is started followed by charging and heating V8 by FeSi followed by AOD treatment V9 with decarburization and alloying to produce, for example AISI 3xx, 4xx, 2xx stainless steel grades
  • the DDD treatment V7 in the Twin AOD-L converter 3 (in the drawing on the right) with subsequent charging and heating V8 is only carried out after completion of the AOD treatment V9.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (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)

Abstract

L'objectif de l'invention est de produire de l'acier inoxydable pour des produits en acier inoxydable aussi bien austénitique que ferritique, à base de fonte brute liquide et de FeCr solides, sans utiliser d'alimentation électrique. Selon l'invention, la fonte brute liquide, après avoir été préchauffée dans un haut-fourneau (1) est soumise à un traitement DDD (déphosphorisation, désiliciumisation, et désulphuration), est chauffée, purifiée ou alliée et désoxydée. La quantité de fonte brute liquide sans laitiers qui a été prétraitée dans le haut-fourneau (1) est séparée et introduite dans deux convertisseurs (2, 3) classiques jumeaux AOD-L, les étapes de traitement chimiques nécessaires (des étapes du traitement DDD et du chauffage, de la décarburation, et de l'étape d'alliage) étant réalisées dans des processus contraires parallèles au moyen d'une énergie chimique autogène, le traitement DDD étant réalisé dans le convertisseur (2) jumeau AOD-L et la décarburation étant réalisée dans le second convertisseur (3) jumeau AOD-L.
EP07856191.7A 2006-11-30 2007-11-20 PROCÉDÉ POUR PRODUIRE DE LA FONTE BRUTE À BASE D'ACIER INOXYDABLE SANS UTILISER DE l'ÉNÉRGIE ÉLECTRIQUE Active EP2097505B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006056672A DE102006056672A1 (de) 2006-11-30 2006-11-30 Verfahren und Vorrichtung zur Rostfreistahlerzeugung ohne elektrische Energiezufuhr auf der Basis von Roheisen
PCT/EP2007/010012 WO2008064797A1 (fr) 2006-11-30 2007-11-20 Procédé et dispositif pour produire de la fonte brute à base d'acier inoxydable sans utiliser d'alimentation électrique

Publications (2)

Publication Number Publication Date
EP2097505A1 true EP2097505A1 (fr) 2009-09-09
EP2097505B1 EP2097505B1 (fr) 2016-08-10

Family

ID=39032113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07856191.7A Active EP2097505B1 (fr) 2006-11-30 2007-11-20 PROCÉDÉ POUR PRODUIRE DE LA FONTE BRUTE À BASE D'ACIER INOXYDABLE SANS UTILISER DE l'ÉNÉRGIE ÉLECTRIQUE

Country Status (9)

Country Link
US (2) US8430945B2 (fr)
EP (1) EP2097505B1 (fr)
JP (1) JP5415275B2 (fr)
KR (1) KR101123038B1 (fr)
CN (1) CN101541941B (fr)
CA (1) CA2671074C (fr)
DE (1) DE102006056672A1 (fr)
ES (1) ES2602303T3 (fr)
WO (1) WO2008064797A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006056671A1 (de) * 2006-11-30 2008-06-05 Sms Demag Ag Verfahren und Vorrichtung zur Rostfreistahlerzeugung ohne elektrische Energiezufuhr auf der Basis von in einer DDD-Anlage vorbehandeltem Roheisen
DE102014222727A1 (de) 2014-11-06 2016-05-12 Sms Group Gmbh Verfahren und Vorrichtung zur Erzeugung eines Rostfreistahls
CN110894565B (zh) * 2019-12-04 2021-07-16 山西太钢不锈钢股份有限公司 超高硅碳铬熔液冶炼不锈钢的方法

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AT263830B (de) * 1965-02-11 1968-08-12 Bot Brassert Oxygen Technik Ag Anlage zur Erzeugung von Stahl
SE329861B (fr) 1969-03-26 1970-10-26 Skf Svenska Kullagerfab Ab
DE1940761C3 (de) * 1969-08-11 1973-02-01 Demag Ag Anlage fuer kontinuierliche Stahlerzeugung
JPS59107016A (ja) * 1982-12-11 1984-06-21 Nisshin Steel Co Ltd ステンレス鋼製造用含Ｎｉ溶湯を得る方法
JPS59182909A (ja) * 1983-03-31 1984-10-17 Nippon Steel Corp 製鋼精錬用ランス
JPS59211519A (ja) * 1983-05-18 1984-11-30 Nisshin Steel Co Ltd 低ｐ含クロム鋼の製造法
JPS6112812A (ja) * 1984-06-27 1986-01-21 Sumitomo Metal Ind Ltd ステンレス鋼の脱炭方法
JPH04224617A (ja) * 1990-12-26 1992-08-13 Kawasaki Steel Corp Ｃｒ鉱石溶融還元によるステンレス鋼の製造方法
JP2848010B2 (ja) * 1991-04-23 1999-01-20 住友金属工業株式会社 溶融金属精錬用上吹ランス
JPH0892614A (ja) * 1994-09-27 1996-04-09 Kawasaki Steel Corp 低塩基度スラグを排滓する溶銑予備処理方法
DE19621143A1 (de) 1996-01-31 1997-08-07 Mannesmann Ag Verfahren zur Erzeugung nichtrostender Stähle
JPH09302405A (ja) * 1996-05-15 1997-11-25 Kawasaki Steel Corp ステンレス鋼の溶製方法
JPH11131122A (ja) * 1997-10-28 1999-05-18 Nippon Steel Corp 高炉溶銑とフェロクロム合金を用いたステンレス粗溶鋼の脱炭精錬方法
ITRM20010146A1 (it) 2001-03-21 2002-09-21 Acciai Speciali Terni Spa Metodo e sistema di controllo per convertitori aod.
AT411068B (de) 2001-11-13 2003-09-25 Voest Alpine Ind Anlagen Verfahren zur herstellung einer metallschmelze in einer hüttentechnischen anlage
GB0213027D0 (en) * 2002-06-07 2002-07-17 Jsr Farming Group Compound
DE10227031A1 (de) * 2002-06-17 2004-01-08 Sms Demag Ag Verfahren und Produktionsanlage zum Erzeugen von Produkten aus C-Stahl oder aus Rostfrei-Stahl
DE102005032929A1 (de) * 2004-11-12 2006-05-18 Sms Demag Ag Herstellung von Rostfreistahl der ferritischen Stahlgruppe AISI 4xx in einem AOD-Konverter
DE102006056671A1 (de) * 2006-11-30 2008-06-05 Sms Demag Ag Verfahren und Vorrichtung zur Rostfreistahlerzeugung ohne elektrische Energiezufuhr auf der Basis von in einer DDD-Anlage vorbehandeltem Roheisen

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
US8765051B2 (en) 2014-07-01
CN101541941A (zh) 2009-09-23
WO2008064797A1 (fr) 2008-06-05
US8430945B2 (en) 2013-04-30
US20120175828A1 (en) 2012-07-12
ES2602303T3 (es) 2017-02-20
US20100011909A1 (en) 2010-01-21
CA2671074A1 (fr) 2008-06-05
CN101541941B (zh) 2014-08-13
CA2671074C (fr) 2011-09-20
KR20090060353A (ko) 2009-06-11
KR101123038B1 (ko) 2012-03-21
EP2097505B1 (fr) 2016-08-10
JP2010511100A (ja) 2010-04-08
DE102006056672A1 (de) 2008-06-05
JP5415275B2 (ja) 2014-02-12

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