EP1332232B1 - Verfahren zur erzeugung nichtrostender stähle, insbesondere chrom- und chromnickelhaltiger edelstähle - Google Patents

Verfahren zur erzeugung nichtrostender stähle, insbesondere chrom- und chromnickelhaltiger edelstähle Download PDF

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Publication number
EP1332232B1
EP1332232B1 EP01969784A EP01969784A EP1332232B1 EP 1332232 B1 EP1332232 B1 EP 1332232B1 EP 01969784 A EP01969784 A EP 01969784A EP 01969784 A EP01969784 A EP 01969784A EP 1332232 B1 EP1332232 B1 EP 1332232B1
Authority
EP
European Patent Office
Prior art keywords
slag
nozzles
blowing
melt
lances
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
Application number
EP01969784A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1332232A1 (de
Inventor
Karl Reiner GÖTZINGER
Stefan Lemke
Johann Reichel
Bernt Rollinger
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 Siemag AG
Original Assignee
SMS Demag 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
Priority claimed from DE10115779A external-priority patent/DE10115779A1/de
Priority claimed from DE10137761A external-priority patent/DE10137761A1/de
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1332232A1 publication Critical patent/EP1332232A1/de
Application granted granted Critical
Publication of EP1332232B1 publication Critical patent/EP1332232B1/de
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
    • 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
    • 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
    • C21C5/005—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
    • C21C5/52—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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/068—Decarburising
    • C21C7/0685—Decarburising of stainless steel

Definitions

  • the invention relates to a method according to the preamble of claim 1 or of claim 2.
  • Multi-stage are used to produce stainless steels containing chrome or chrome nickel Processes in a melting device comprising at least two vessels known.
  • a Decarburization carried out to a carbon content of less than 0.3%. Always a high energy expenditure is required and temperature losses are inevitable.
  • Such a method is known from DE 196 21 143.
  • the one described here Process is carried out in a melting device, the at least comprises two vessels. Both vessels are operated in parallel, each in Vessel alternately either electrodes for melting the batch or Blow lances for inflating and / or blowing oxygen and oxygen mixtures can be used.
  • the vessels thus initially serve as melting points then as a fresh aggregate.
  • the invention is based on the task of making such a process more economical do.
  • the core of the invention is the reversible treatment of unreduced converter slag in electric arc furnace operation.
  • the reduction is now carried out simultaneously with a new one Melting a new batch while retaining the slag from the previous one Blow process carried out in the vessel.
  • a process step namely the downstream reduction of the slag, saved and the chrome-containing slag was not removed from the system. All in all this makes the process easier and more economical.
  • the proposed method can basically be done in a single metallurgical process Drain the vessel.
  • claims 2 proposed that processes in a melting device with two, alternately operated, metallurgical vessels. Then it will be parallel to the decarburizing blowing of the batch in the first treatment vessel the melting process of a second batch including that Slag reduction process carried out in the second treatment vessel.
  • the melting process can also be done in a different way than electrically using arcs be carried out, taking care that the cheap thermodynamic conditions for slag reduction are maintained.
  • the blowing of oxygen or oxygen mixtures in Form of inflation and / or side inflation performed.
  • inert gases are blown in.
  • the melt is at a blow time of the oxygen of 20 to 40 min Final carbon content of ⁇ 0.9%, preferably ⁇ 0.4%, decarburized.
  • Coolants are added during oxygen blowing, for example in the form of Ni, FeNi, ferrochrome, scrap and other ferrous metallic Raw materials such as pig iron pellets, DRI or alloying agents to make the To reach the target temperature.
  • the blowing process is carried out at a Carbon content equal to or less than 0.9%, preferably equal to or less than 0.4%, and a temperature above 1,680'C and the Metal melt tapped into a pan.
  • This will be separated in the further course of treatment the molten metal to the desired final carbon content of ⁇ 0.1% by means of a secondary metallurgical treatment, preferably vacuum degassing, brought.
  • a secondary metallurgical treatment preferably vacuum degassing
  • the chromium oxide contained in the high-chromium slag is through directly reduces carbon and silicon to metallic chrome.
  • the melting device 1 consists of two treatment vessels 2, 3, in which alternately an electric arc furnace process (1) and a blowing process (11) operate.
  • an electric arc furnace process (1) In the left treatment vessel 2 is the operating state of the Melting down using electric arcs in the right treatment vessel 3 the operating state of freshening or oxygen blowing for reduction of the carbon content of the melt.
  • a lance 4 is attached to a lance support arm 5 for blowing in oxygen, the coaxial to the main axis of the vessel through an exhaust manifold 6 and the lid heart opening 7 of a pivoted lid 8 of the right treatment vessel 3 is guided into the interior of the upper vessel part 9.
  • the mouth 10 of the Exhaust manifold 6 leans against the lid heart opening 7 of the lid 8.
  • the upper part 9 and the lower part 11 together form the furnace vessel 3.
  • the exhaust manifold 6 is via a rotating device 12 to the adjacent treatment vessel 2 swiveling.
  • the lower part 11 has a tap opening 13, here the bottom cut, for the molten metal, while the chrome one Slag remains in the vessel.
  • the treatment vessel 2 shown on the left has a pivotable electrode arm 14 on which, in the present case, three electrodes 15a, b, c are attached are by the lid heart 16 of the left treatment vessel 2, which closes the lid heart opening 17, are guided.
  • the tapped melt is a steel casting plant or a secondary metallurgical Treatment plant (not shown) supplied.
  • the Batch contains in particular carbon and silicon-containing raw materials, and the the entire content is then melted down.
  • the high-chromium slag is reduced after the melt has reached a temperature value of a minimum of 1,490'C.
  • the slag is removed and the melt is subjected to a blowing process, whereby the melt to a carbon value ⁇ 0.9%, preferably ⁇ 0.4%, decarburized and to a tapping temperature of 1,620 to 1.7200C is heated.
  • the electrode arm 14 is swung out and the Oxygen lance 4 swung in. Then only the molten metal, tapped. The lance 4 is moved out and the process starts from again. This process takes place in the adjacent treatment vessel offset in time.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (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)
  • Manufacture And Refinement Of Metals (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Laminated Bodies (AREA)
EP01969784A 2000-10-18 2001-09-27 Verfahren zur erzeugung nichtrostender stähle, insbesondere chrom- und chromnickelhaltiger edelstähle Expired - Lifetime EP1332232B1 (de)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
DE10051803 2000-10-18
DE10051803 2000-10-18
DE10115779A DE10115779A1 (de) 2000-10-18 2001-03-29 Verfahren zur Erzeugung nichtrostender Stähle, insbesondere chrom- und chromnickelhaltiger Edelstähle
DE10115779 2001-03-29
DE10134880 2001-07-18
DE10134880 2001-07-18
DE10137761 2001-08-01
DE10137761A DE10137761A1 (de) 2001-07-18 2001-08-01 Verfahren zur Erzeugung nichtrostender Stähle, insbesondere chrom-und chromnickelhaltiger Edelstähle
PCT/EP2001/011190 WO2002033130A1 (de) 2000-10-18 2001-09-27 Verfahren zur erzeugung nichtrostender stähle, insbesondere chrom- und chromnickelhaltiger edelstähle

Publications (2)

Publication Number Publication Date
EP1332232A1 EP1332232A1 (de) 2003-08-06
EP1332232B1 true EP1332232B1 (de) 2004-04-07

Family

ID=27437895

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01969784A Expired - Lifetime EP1332232B1 (de) 2000-10-18 2001-09-27 Verfahren zur erzeugung nichtrostender stähle, insbesondere chrom- und chromnickelhaltiger edelstähle

Country Status (14)

Country Link
US (1) US7094271B2 (ja)
EP (1) EP1332232B1 (ja)
JP (1) JP2004511659A (ja)
KR (1) KR100819126B1 (ja)
CN (1) CN1222629C (ja)
AT (1) ATE263845T1 (ja)
BR (1) BR0114773B1 (ja)
CZ (1) CZ299403B6 (ja)
DE (1) DE50101945D1 (ja)
ES (1) ES2218450T3 (ja)
MX (1) MXPA03003402A (ja)
PL (1) PL196203B1 (ja)
TW (1) TW554046B (ja)
WO (1) WO2002033130A1 (ja)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10323507A1 (de) * 2003-05-24 2004-12-09 Sms Demag Ag Verfahren zur Rückgewinnung von metallischen Elementen, insbesondere metallischem Chrom, aus metalloxidhaltigen Schlacken im Elektrolichtbogenofen
KR100793591B1 (ko) * 2006-12-28 2008-01-14 주식회사 포스코 산화크롬 함유 슬래그로부터의 크롬 금속 환원 방법
AU2009279363B2 (en) 2008-08-04 2015-11-19 Nucor Corporation Low cost making of a low carbon, low sulfur, and low nitrogen steel using conventional steelmaking equipment
WO2011045755A1 (en) * 2009-10-13 2011-04-21 Petrus Hendrik Ferreira Bouwer Ferrochrome alloy production
CN101914715B (zh) * 2010-08-31 2012-06-06 振石集团东方特钢股份有限公司 一种冶炼不锈钢母液的方法
US9551045B2 (en) * 2011-05-27 2017-01-24 A. Finkl & Sons Co. Flexible minimum energy utilization electric arc furnace system and processes for making steel products
CN106435398B (zh) * 2016-10-15 2017-12-29 睿智钢业有限公司 耐腐蚀焊接结构钢及其制备方法
CN107504828A (zh) * 2017-07-25 2017-12-22 攀钢集团研究院有限公司 钒铁冶炼炉
CN115558816B (zh) * 2022-09-01 2023-09-19 广东广青金属科技有限公司 一种利用矿热炉烟气与炉渣显热的镍铬合金的冶炼方法与系统

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2430131A (en) * 1944-11-04 1947-11-04 American Rolling Mill Co Production of stainless steel
US5417740A (en) 1992-05-26 1995-05-23 Zaptech Corporation Method for producing steel
AT403293B (de) * 1995-01-16 1997-12-29 Kct Tech Gmbh Verfahren und anlage zum herstellen von legierten stählen
DE19621143A1 (de) * 1996-01-31 1997-08-07 Mannesmann Ag Verfahren zur Erzeugung nichtrostender Stähle
DE19728102C2 (de) 1997-07-02 1999-08-05 Schloemann Siemag Ag Verfahren und Vorrichtung zur Herstellung von Stählen mit hohem Cr-Gehalt und/oder Ferrolegierungen
JP2003502504A (ja) * 1999-06-23 2003-01-21 エスエムエス・デマーク・アクチエンゲゼルシャフト 酸化クロム含有スラグから金属クロムを回収するための方法

Also Published As

Publication number Publication date
WO2002033130A1 (de) 2002-04-25
PL360842A1 (en) 2004-09-20
BR0114773B1 (pt) 2010-03-09
KR100819126B1 (ko) 2008-04-02
EP1332232A1 (de) 2003-08-06
JP2004511659A (ja) 2004-04-15
MXPA03003402A (es) 2004-05-04
US7094271B2 (en) 2006-08-22
CZ20031111A3 (cs) 2003-10-15
CN1469933A (zh) 2004-01-21
CZ299403B6 (cs) 2008-07-16
CN1222629C (zh) 2005-10-12
US20040099091A1 (en) 2004-05-27
ES2218450T3 (es) 2004-11-16
KR20030040541A (ko) 2003-05-22
PL196203B1 (pl) 2007-12-31
TW554046B (en) 2003-09-21
BR0114773A (pt) 2003-10-07
ATE263845T1 (de) 2004-04-15
DE50101945D1 (de) 2004-05-13

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