EP1332232A1 - Verfahren zur erzeugung nichtrostender stähle, insbesondere chrom- und chromnickelhaltiger edelstähle - Google Patents
Verfahren zur erzeugung nichtrostender stähle, insbesondere chrom- und chromnickelhaltiger edelstähleInfo
- Publication number
- EP1332232A1 EP1332232A1 EP01969784A EP01969784A EP1332232A1 EP 1332232 A1 EP1332232 A1 EP 1332232A1 EP 01969784 A EP01969784 A EP 01969784A EP 01969784 A EP01969784 A EP 01969784A EP 1332232 A1 EP1332232 A1 EP 1332232A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzles
- slag
- chromium
- blowing
- melt
- 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
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
- 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
- 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
- C21C5/005—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 claim 2.
- Multi-stage processes in a melting device comprising at least two vessels are known for producing chromium or chromium-nickel-containing stainless steels.
- decarburization is carried out up to a carbon content of below 0.3%. High energy consumption is always required and temperature losses are inevitable.
- Such a method is known from DE 196 21 143.
- the method described here is carried out in a melting device which comprises at least two vessels. Both vessels are operated in parallel, with either vessel alternately using electrodes for melting the batch or blowing lances for inflating and / or blowing in oxygen and oxygen mixtures.
- the vessels thus serve first as a melting unit and then as a fresh unit.
- the slag is reduced with reducing agents such as ferrosilicon, aluminum or secondary aluminum when adding slag formers such as lime and fluorspar to recover oxidized chromium and then tapped.
- the object of the invention is to make such a process more economical.
- the core of the invention is the reversible treatment of unreduced converter slag in electric arc furnace operation.
- the reduction of the high-chromium-containing slag and thus the recovery of the metallic chromium is carried out in a process step downstream of the melting and oxygen blowing and separate from this, the reduction is now carried out simultaneously with a renewed melting process of a new batch while retaining the slag of the previous blowing process in the vessel.
- one process step namely the subsequent reduction of the slag, is saved and the chromium-containing slag is not removed from the system. Overall, this makes the process easier and more economical.
- the proposed method can basically run in a single metallurgical vessel. To accelerate the tapping times, it is proposed according to claim 2 that the method be carried out in a melting device with two, alternately operated, metallurgical vessels. Then, in addition to the decarburizing blowing of the batch in the first treatment vessel, the melting process of a second batch, including the reduction process of the slag, is carried out in the second treatment vessel.
- the melting process can also be carried out in a manner other than electrical by means of arcs, it being important to ensure that the favorable thermodynamic conditions for reducing the slag are maintained.
- the blowing of oxygen or oxygen mixtures is preferably carried out in the form of inflation and / or side blowing.
- inert gases can be blown in at the same time as the oxygen blowing process.
- the melt is decarburized to a final carbon content of ⁇ 0.9%, preferably of ⁇ 0.4%, with an oxygen blowing time of 20 to 40 min.
- 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 powders, DRI or alloying agents in order to reach the target temperature.
- the blowing process is ended at a carbon content of equal to or less than 0.9%, preferably equal to or less than 0.4%, and a temperature of above 1,680 ° C. and the molten metal is tapped into a pan.
- the slag remains in the vessel in order to be subsequently reduced there during the renewed melting process.
- the metal melt is brought to the desired final carbon content of ⁇ 0.1% in the further treatment process by means of a secondary metallurgical treatment, preferably vacuum degassing.
- the high-chromium-containing slag is reduced in the batch with the silicon or carbon from silicon or carbon-containing alloy carriers.
- carbon and possibly silicon are additionally added.
- the chromium oxide contained in the high-chromium-containing slag is directly reduced to metallic chromium by the carbon and silicon.
- the melting device 1 consists of two treatment vessels 2, 3, in which an electric arc furnace process (1) and a blowing process (11) are alternately operated.
- the operating state of melting by means of electric arcs is shown in the left treatment vessel 2, and the operating state of freshening or oxygen blowing to reduce the carbon content of the melt is shown in the right treatment vessel 3.
- a lance 4 is attached to a lance support arm 5, which is guided coaxially to the main axis of the vessel through an exhaust manifold 6 and the lid heart opening 7 of a pivoted cover 8 of the right treatment vessel 3 into the interior of the upper part 9 of the vessel.
- 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 can be pivoted to the adjacent treatment vessel 2 via a rotating device 12.
- the lower part 11 has a tap opening 13, here the bottom tap, for the molten metal, while the chromium-containing slag remains in the vessel.
- bottom nozzles 22 In the bottom or in the wall of the vessel there are in each case individually or combined bottom nozzles 22, flushing blocks, side under-bath nozzles, side nozzles 20 and / or side lances 21 through which oxygen, inert gas or gas mixtures are blown.
- the treatment vessel 2 shown on the left has a pivotable electrode arm 14, to which, in the present case, three electrodes 15a, b, c are attached, which are guided through the lid heart 16 of the left treatment vessel 2, which closes the lid heart opening 17.
- a new melting process is started.
- the tapped melt is fed to a steel casting plant or a secondary metallurgical treatment plant (not shown).
- Charging is carried out on the non-tapped slag 19 remaining in the vessel, the batch containing in particular carbon and silicon-containing raw materials, and the entire content is then melted down.
- the high-chrome slag is reduced after the melt has reached a temperature of a minimum of 1,490'C. After a temperature value of preferably a minimum of 1,550 ° C.
- the slag is removed and the melt is subjected to a blowing process, as a result of which the melt is decarburized to a carbon value of ⁇ 0.9%, preferably ⁇ 0.4% and to a tapping temperature of 1,620 is heated to 1.7200C.
- the electrode arm 14 is swung out and the oxygen lance 4 swung in. Then only the molten metal is tapped. The lance 4 is moved out and the process begins again. In the adjacent treatment vessel, this process takes place at different times.
Landscapes
- 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)
Abstract
Description
Claims
Applications Claiming Priority (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10051803 | 2000-10-18 | ||
| DE10051803 | 2000-10-18 | ||
| DE10115779 | 2001-03-29 | ||
| DE10115779A DE10115779A1 (de) | 2000-10-18 | 2001-03-29 | Verfahren zur Erzeugung nichtrostender Stähle, insbesondere chrom- und chromnickelhaltiger Edelstähle |
| DE10134880 | 2001-07-18 | ||
| DE10134880 | 2001-07-18 | ||
| DE10137761A DE10137761A1 (de) | 2001-07-18 | 2001-08-01 | Verfahren zur Erzeugung nichtrostender Stähle, insbesondere chrom-und chromnickelhaltiger Edelstähle |
| DE10137761 | 2001-08-01 | ||
| 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 true EP1332232A1 (de) | 2003-08-06 |
| EP1332232B1 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 (de) |
| EP (1) | EP1332232B1 (de) |
| JP (1) | JP2004511659A (de) |
| KR (1) | KR100819126B1 (de) |
| CN (1) | CN1222629C (de) |
| AT (1) | ATE263845T1 (de) |
| BR (1) | BR0114773B1 (de) |
| CZ (1) | CZ299403B6 (de) |
| DE (1) | DE50101945D1 (de) |
| ES (1) | ES2218450T3 (de) |
| MX (1) | MXPA03003402A (de) |
| PL (1) | PL196203B1 (de) |
| TW (1) | TW554046B (de) |
| WO (1) | WO2002033130A1 (de) |
Families Citing this family (10)
| 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 |
| PL3147376T3 (pl) | 2008-08-04 | 2019-03-29 | Nucor Corporation | Niskokosztowe wytwarzanie stali o niskiej zawartości węgla, niskiej zawartości siarki i niskiej zawartości azotu przy użyciu konwencjonalnego wyposażenia stalowniczego |
| 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 |
| CN118621087B (zh) * | 2024-08-09 | 2024-11-05 | 金鼎重工有限公司 | 一种铸钢母液精炼装置及精炼方法 |
Family Cites Families (6)
| 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 |
| PL352472A1 (en) * | 1999-06-23 | 2003-08-25 | Sms Demag Ag | Method of recovering metallic chromium from a chromium oxide containing slag |
-
2001
- 2001-09-27 AT AT01969784T patent/ATE263845T1/de active
- 2001-09-27 CN CNB018174841A patent/CN1222629C/zh not_active Expired - Fee Related
- 2001-09-27 DE DE50101945T patent/DE50101945D1/de not_active Expired - Lifetime
- 2001-09-27 BR BRPI0114773-0A patent/BR0114773B1/pt not_active IP Right Cessation
- 2001-09-27 US US10/399,007 patent/US7094271B2/en not_active Expired - Fee Related
- 2001-09-27 MX MXPA03003402A patent/MXPA03003402A/es active IP Right Grant
- 2001-09-27 WO PCT/EP2001/011190 patent/WO2002033130A1/de not_active Ceased
- 2001-09-27 KR KR1020037005323A patent/KR100819126B1/ko not_active Expired - Fee Related
- 2001-09-27 ES ES01969784T patent/ES2218450T3/es not_active Expired - Lifetime
- 2001-09-27 PL PL360842A patent/PL196203B1/pl unknown
- 2001-09-27 CZ CZ20031111A patent/CZ299403B6/cs not_active IP Right Cessation
- 2001-09-27 JP JP2002536098A patent/JP2004511659A/ja not_active Withdrawn
- 2001-09-27 EP EP01969784A patent/EP1332232B1/de not_active Expired - Lifetime
- 2001-10-16 TW TW090125517A patent/TW554046B/zh not_active IP Right Cessation
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0233130A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| PL196203B1 (pl) | 2007-12-31 |
| KR100819126B1 (ko) | 2008-04-02 |
| PL360842A1 (en) | 2004-09-20 |
| ATE263845T1 (de) | 2004-04-15 |
| DE50101945D1 (de) | 2004-05-13 |
| EP1332232B1 (de) | 2004-04-07 |
| WO2002033130A1 (de) | 2002-04-25 |
| CN1222629C (zh) | 2005-10-12 |
| BR0114773B1 (pt) | 2010-03-09 |
| TW554046B (en) | 2003-09-21 |
| ES2218450T3 (es) | 2004-11-16 |
| KR20030040541A (ko) | 2003-05-22 |
| CZ20031111A3 (cs) | 2003-10-15 |
| CN1469933A (zh) | 2004-01-21 |
| MXPA03003402A (es) | 2004-05-04 |
| JP2004511659A (ja) | 2004-04-15 |
| CZ299403B6 (cs) | 2008-07-16 |
| BR0114773A (pt) | 2003-10-07 |
| US20040099091A1 (en) | 2004-05-27 |
| US7094271B2 (en) | 2006-08-22 |
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