EP2097505B1 - Verfahren zur rostfreistahlerzeugung ohne elektrische energiezufuhr auf der basis von roheisen - Google Patents

Verfahren zur rostfreistahlerzeugung ohne elektrische energiezufuhr auf der basis von roheisen Download PDF

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Publication number
EP2097505B1
EP2097505B1 EP07856191.7A EP07856191A EP2097505B1 EP 2097505 B1 EP2097505 B1 EP 2097505B1 EP 07856191 A EP07856191 A EP 07856191A EP 2097505 B1 EP2097505 B1 EP 2097505B1
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EP
European Patent Office
Prior art keywords
pig iron
aod
converter
carried out
twin
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.)
Active
Application number
EP07856191.7A
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German (de)
English (en)
French (fr)
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EP2097505A1 (de
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
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SMS Group GmbH
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Publication date
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Publication of EP2097505A1 publication Critical patent/EP2097505A1/de
Application granted granted Critical
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    • 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 for stainless steel production without electrical energy supply based on liquid pig iron and FeCr solids, wherein the liquid pig iron after a pre-treatment in the blast furnace and a DDD treatment (dephosphorization, desilication, desulfurization) heated in an AOD converter, ennobled 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
  • the method is based on a running according to a process model and the metallurgical plant controlling computational technology, in the process model, the behavior for at least one variable process parameter between an actual process variable, a manipulated variable and describes a process end size.
  • An example of the manufacturing process for AISI 304 grades is described.
  • 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 melted down Scrap and alloy outside the oven mixed in a pan and then charged into the converter.
  • the object of the invention is that of the WO 2006/050963 A2 Known method with AOD technology for direct charging of pig iron and alloying in the converter for stainless steel production of all stainless steel, such as AISI 3xx, 4xx, 2xx, both austenitic and ferritic range using autogenous chemical energy to use.
  • 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 quantity of pig iron and separated into two classic "Twin" AOD In the first twin AOD-L converter, the required chemical process steps (the DDD treatment, charging and heating, decarburization and alloying) are carried out using parallel countercurrent flow using autogenous chemical energy First, the DDD treatment and in the second Twin AOD-L converter, first the decarburization is performed.
  • 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.
  • 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 pig iron or via the charged with the charged FeSi autogenous chemical energy is used.
  • 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. 1 In a drawing figure, an exemplary process line for the production of stainless steel is shown.
  • 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 process steps are carried out in a contrary process, the DDD treatment and the refining and alloying of the molten pig iron.
  • 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 the contrary sequence of the process steps carried out in the Twin AOD-L converters 2 and 3 is shown. While in the Twin AOD-L converter 2 (on the left in the drawing) a 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.

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  • 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)
EP07856191.7A 2006-11-30 2007-11-20 Verfahren zur rostfreistahlerzeugung ohne elektrische energiezufuhr auf der basis von roheisen Active EP2097505B1 (de)

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 (de) 2006-11-30 2007-11-20 Verfahren und vorrichtung zur rostfreistahlerzeugung ohne elektrische energiezufuhr auf der basis von roheisen

Publications (2)

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

Family

ID=39032113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07856191.7A Active EP2097505B1 (de) 2006-11-30 2007-11-20 Verfahren zur rostfreistahlerzeugung ohne elektrische energiezufuhr auf der basis von roheisen

Country Status (9)

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

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

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT263830B (de) * 1965-02-11 1968-08-12 Bot Brassert Oxygen Technik Ag Anlage zur Erzeugung von Stahl
SE329861B (ja) 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

Also Published As

Publication number Publication date
CA2671074A1 (en) 2008-06-05
KR20090060353A (ko) 2009-06-11
US20120175828A1 (en) 2012-07-12
ES2602303T3 (es) 2017-02-20
US8765051B2 (en) 2014-07-01
JP5415275B2 (ja) 2014-02-12
EP2097505A1 (de) 2009-09-09
KR101123038B1 (ko) 2012-03-21
CN101541941A (zh) 2009-09-23
JP2010511100A (ja) 2010-04-08
CA2671074C (en) 2011-09-20
WO2008064797A1 (de) 2008-06-05
US20100011909A1 (en) 2010-01-21
US8430945B2 (en) 2013-04-30
CN101541941B (zh) 2014-08-13
DE102006056672A1 (de) 2008-06-05

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