EP1141422A1 - Verfahren zur denitrierung von geschmolzenem stahl während des frischprozesses - Google Patents
Verfahren zur denitrierung von geschmolzenem stahl während des frischprozessesInfo
- Publication number
- EP1141422A1 EP1141422A1 EP99959490A EP99959490A EP1141422A1 EP 1141422 A1 EP1141422 A1 EP 1141422A1 EP 99959490 A EP99959490 A EP 99959490A EP 99959490 A EP99959490 A EP 99959490A EP 1141422 A1 EP1141422 A1 EP 1141422A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- carbon
- denitriding
- bath
- oxygen
- nitrogen
- 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
- 238000000034 method Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 title claims description 19
- 239000010959 steel Substances 0.000 title claims description 19
- 238000004519 manufacturing process Methods 0.000 title abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 50
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 49
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000001301 oxygen Substances 0.000 claims abstract description 32
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 32
- 229910052751 metal Inorganic materials 0.000 claims abstract description 31
- 239000002184 metal Substances 0.000 claims abstract description 31
- 239000007789 gas Substances 0.000 claims description 13
- 238000002360 preparation method Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 229910000976 Electrical steel Inorganic materials 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 80
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 40
- 239000000843 powder Substances 0.000 abstract description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 abstract 1
- 238000002347 injection Methods 0.000 description 24
- 239000007924 injection Substances 0.000 description 24
- 238000005261 decarburization Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 238000005406 washing Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 229910001338 liquidmetal Inorganic materials 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- -1 aluminum nitrides Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 150000002829 nitrogen Chemical class 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000001936 parietal effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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
- C21C7/072—Treatment with gases
-
- 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
- C21C7/0025—Adding carbon material
-
- 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
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/0025—Charging or loading melting furnaces with material in the solid state
- F27D3/0026—Introducing additives into the melt
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/18—Charging particulate material using a fluid carrier
Definitions
- the present invention relates to the field of the production of steels with low nitrogen contents. It advantageously applies to the development of low and very low carbon grades.
- the presence of nitrogen in steel can be undesirable for various reasons.
- One of them is the impact of this element on the properties of use of steels, as a result of a reduction in the ductility of the metal and therefore in its ability to stamp, or, if the nitrogen is present in the form of aluminum nitrides, due to a limitation of the weldability due to a re-dissolution of the nitrogen in the ZAC (zone affected by heat) and the resulting local mechanical embrittlement.
- the presence of nitrogen can also be undesirable because of its impact on the very stages of the production chains, such as an increase in the cracks linked to the ductility pocket in continuous casting, or the decrease in the ability of the product obtained to be drawn.
- These nitrogen contents are expected at the steelworks, at all the stages of the development of the molten metal, from the electric furnace, or from the converter until its solidification in continuous casting.
- the preparation in the electric oven in particular, is distinguished by a strong nitrogen contamination of the metal, due to the cracking of the nitrogen molecule from the air in the thermal zone of the electric arc which facilitates its transfer to the liquid metal.
- a N is the dissolved nitrogen activity, which can be assimilated to the nitrogen content of the metal in the case of low-alloy carbon steels
- P N2 is the partial nitrogen pressure of the gas in contact with the liquid metal. This means that in the presence of atmospheric N, the The nitrogen content of the metal will continuously increase towards its solubility limit, which is around 430 ppm at the temperature of the molten steel (approximately 1600 ° C).
- this gas can be argon or helium injected, but at low flow rate and with a high cost, or carbon monoxide formed in situ by the decarburization of the metal during the injection of oxygen, which is conventionally practiced in gaseous or particulate form (see for example the article by K. Shinme and T. Matsuo, "Acceleration of nitrogen removal with decarburization by powdered oxidizer blowing under reduced pressure", published in the Japanese journal ISIJ in 1987).
- the aim of the present invention is precisely to promote denitriding of the molten metal which makes the best use of the denitriding potential of the washing gas on the one hand, and which on the other hand allows the final nitrogen content to be controlled independently of the initial carbon content of the metal bath, whereas this is currently the case with conventional decarburization.
- the subject of the invention is a process for denitriding molten steel during production by blowing in oxygen, characterized in that it consists in also providing carbon in an insufflable form (powdered carbon). , and in that carbon and oxygen are injected jointly but separately within the same zone of the metal bath (at a distance of about 20 cm from each other for example).
- the carbon content of the metal bath is not modified.
- FIG. 1 is a graph showing the comparative evolution of the weight content in nitrogen from a steel bath in an electric oven containing more than 0.15% carbon by weight, depending on the volume of CO emitted into the bath, from a solitary injection of oxygen (curve a) and from 'a carbon-oxygen co-injection according to the invention (curve b);
- FIG. 2 is a graph similar to that of the previous figure, but on a decarburized bath, that is to say in the case where the carbon content by weight of the metal bath is low, namely less than 0.1%;
- FIG. 3 is a graph showing the comparative evolution of the nitrogen content by weight as a function of the volume of CO emitted in the bath by carbon-oxygen co-injection according to the nature of the gas transporting the injected carbon.
- the co-injection technique according to the invention has been tested and implemented under industrial conditions in a small furnace of 6 tonnes of capacity, by simultaneously supplying carbon and oxygen by two independent injection lances whose outlet ends were placed side by side at the same level within the bath of molten steel to be treated, about twenty centimeters from each other.
- the carbon was supplied by a coal with low sulfur and nitrogen contents (weight contents of less than 0% for these two elements), and using either argon or nitrogen as the carrier gas.
- Oxygen was supplied either by injection of gaseous O 2 or by injection of iron ore (equivalent to 0.2 Nm 3 of O 2 per lkg of ore).
- the denitriding method of the invention turns out to be flexible enough to allow multiple implementation variants, some examples of which are mentioned below: - Use of any type of carbon and oxygen supply.
- Co-injection according to the invention can be carried out without particular difficulties in the electric furnace, but also in the converter blowing O 2 from above (type LD, AOD) or through the bottom (type OBM, LWS); in a pocket oven or in vacuum systems, type RH, where we can also benefit from the effect of vacuum on denitriding (P N2 low above the metal bath).
- type LD type LD, AOD
- OBM type OBM
- LWS in vacuum systems
- P N2 low above the metal bath type RH
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9816082A FR2787468B1 (fr) | 1998-12-18 | 1998-12-18 | Procede de denitruration de l'acier en fusion en cours d'elaboration |
| FR9816082 | 1998-12-18 | ||
| PCT/FR1999/003176 WO2000037688A1 (fr) | 1998-12-18 | 1999-12-17 | Procede de denitruration de l'acier en fusion en cours d'elaboration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1141422A1 true EP1141422A1 (de) | 2001-10-10 |
| EP1141422B1 EP1141422B1 (de) | 2003-08-06 |
Family
ID=9534200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99959490A Expired - Lifetime EP1141422B1 (de) | 1998-12-18 | 1999-12-17 | Verfahren zur denitrierung von geschmolzenem stahl während des frischprozesses |
Country Status (24)
| Country | Link |
|---|---|
| US (1) | US6565622B1 (de) |
| EP (1) | EP1141422B1 (de) |
| JP (1) | JP2002533566A (de) |
| KR (1) | KR20010101205A (de) |
| CN (1) | CN1329675A (de) |
| AT (1) | ATE246734T1 (de) |
| AU (1) | AU756853B2 (de) |
| BG (1) | BG105612A (de) |
| BR (1) | BR9916269A (de) |
| CA (1) | CA2356370A1 (de) |
| CZ (1) | CZ20012225A3 (de) |
| DE (1) | DE69910256T2 (de) |
| EA (1) | EA003345B1 (de) |
| ES (1) | ES2205916T3 (de) |
| FR (1) | FR2787468B1 (de) |
| HU (1) | HUP0104705A3 (de) |
| PL (1) | PL348064A1 (de) |
| RO (1) | RO121135B1 (de) |
| SI (1) | SI20533A (de) |
| SK (1) | SK7932001A3 (de) |
| TR (1) | TR200101606T2 (de) |
| WO (1) | WO2000037688A1 (de) |
| YU (1) | YU42501A (de) |
| ZA (1) | ZA200104661B (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050063798A1 (en) * | 2003-06-06 | 2005-03-24 | Davis Jeffry Alan | Interchangeable workpiece handling apparatus and associated tool for processing microfeature workpieces |
| US20050050767A1 (en) * | 2003-06-06 | 2005-03-10 | Hanson Kyle M. | Wet chemical processing chambers for processing microfeature workpieces |
| US7313462B2 (en) * | 2003-06-06 | 2007-12-25 | Semitool, Inc. | Integrated tool with automated calibration system and interchangeable wet processing components for processing microfeature workpieces |
| CN112342400A (zh) * | 2020-10-14 | 2021-02-09 | 潘玉霞 | 一种五金铸件的精密消气泡铸造工艺 |
| DE102021121472A1 (de) | 2021-08-18 | 2023-02-23 | Sms Group Gmbh | Elektrolichtbogenofen, Verfahren zum Betrieb eines Elektrolichtbogenofens und Verwendung eines Elektrolichtbogenofens |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE739066A (en) * | 1969-09-18 | 1970-03-18 | Electro pneumatic steel | |
| FR2540518B1 (fr) * | 1983-02-03 | 1991-09-06 | Siderurgie Fse Inst Rech | Procede pour la conduite d'un four metallurgique de fusion et dispositif de mise en oeuvre |
| JPH0819456B2 (ja) * | 1987-02-24 | 1996-02-28 | 新日本製鐵株式会社 | 極低窒素鋼の溶製方法 |
| DE4242328C2 (de) * | 1992-12-15 | 1995-06-08 | Alfred Dipl Ing Dr Freissmuth | Mittel zur Entschwefelung, Entphosphorung, Entsilicierung und Entstickung von Roheisen- und Gußeisenschmelzen |
| FR2705767B1 (fr) * | 1993-05-27 | 1995-07-21 | Lorraine Laminage | Procédé et installation de production d'acier liquide à partir de matières ferreuses riches en matières carbonées. |
| JPH0726318A (ja) * | 1993-07-09 | 1995-01-27 | Kawasaki Steel Corp | 製鋼用電気炉の操業方法 |
| JPH09165615A (ja) * | 1995-12-14 | 1997-06-24 | Kawasaki Steel Corp | 溶融金属の脱窒方法 |
| JPH1112634A (ja) * | 1997-06-20 | 1999-01-19 | Nkk Corp | アーク炉による低窒素溶鋼の製造方法 |
| LU90154B1 (fr) * | 1997-10-17 | 1999-04-19 | Wurth Paul Sa | Procede pour la fusion en continu de produits metalliques solides |
-
1998
- 1998-12-18 FR FR9816082A patent/FR2787468B1/fr not_active Expired - Fee Related
-
1999
- 1999-12-17 RO ROA200100695A patent/RO121135B1/ro unknown
- 1999-12-17 CZ CZ20012225A patent/CZ20012225A3/cs unknown
- 1999-12-17 KR KR1020017007403A patent/KR20010101205A/ko not_active Application Discontinuation
- 1999-12-17 SI SI9920093A patent/SI20533A/sl not_active IP Right Cessation
- 1999-12-17 EA EA200100563A patent/EA003345B1/ru not_active IP Right Cessation
- 1999-12-17 AU AU16648/00A patent/AU756853B2/en not_active Ceased
- 1999-12-17 US US09/857,361 patent/US6565622B1/en not_active Expired - Fee Related
- 1999-12-17 HU HU0104705A patent/HUP0104705A3/hu unknown
- 1999-12-17 DE DE69910256T patent/DE69910256T2/de not_active Expired - Lifetime
- 1999-12-17 TR TR2001/01606T patent/TR200101606T2/xx unknown
- 1999-12-17 EP EP99959490A patent/EP1141422B1/de not_active Expired - Lifetime
- 1999-12-17 BR BR9916269-5A patent/BR9916269A/pt not_active Application Discontinuation
- 1999-12-17 YU YU42501A patent/YU42501A/sh unknown
- 1999-12-17 ES ES99959490T patent/ES2205916T3/es not_active Expired - Lifetime
- 1999-12-17 AT AT99959490T patent/ATE246734T1/de active
- 1999-12-17 CA CA002356370A patent/CA2356370A1/fr not_active Abandoned
- 1999-12-17 SK SK793-2001A patent/SK7932001A3/sk unknown
- 1999-12-17 CN CN99813960A patent/CN1329675A/zh active Pending
- 1999-12-17 WO PCT/FR1999/003176 patent/WO2000037688A1/fr not_active Application Discontinuation
- 1999-12-17 JP JP2000589741A patent/JP2002533566A/ja active Pending
- 1999-12-17 PL PL99348064A patent/PL348064A1/xx not_active Application Discontinuation
-
2001
- 2001-06-07 ZA ZA200104661A patent/ZA200104661B/xx unknown
- 2001-06-18 BG BG105612A patent/BG105612A/xx unknown
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0037688A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1329675A (zh) | 2002-01-02 |
| DE69910256T2 (de) | 2004-07-01 |
| PL348064A1 (en) | 2002-05-06 |
| EP1141422B1 (de) | 2003-08-06 |
| SK7932001A3 (en) | 2002-01-07 |
| FR2787468A1 (fr) | 2000-06-23 |
| US6565622B1 (en) | 2003-05-20 |
| TR200101606T2 (tr) | 2001-10-22 |
| BG105612A (en) | 2002-01-31 |
| ATE246734T1 (de) | 2003-08-15 |
| AU1664800A (en) | 2000-07-12 |
| HUP0104705A3 (en) | 2002-06-28 |
| DE69910256D1 (de) | 2003-09-11 |
| ZA200104661B (en) | 2002-06-07 |
| WO2000037688A1 (fr) | 2000-06-29 |
| HUP0104705A2 (hu) | 2002-03-28 |
| YU42501A (sh) | 2003-12-31 |
| FR2787468B1 (fr) | 2001-12-07 |
| AU756853B2 (en) | 2003-01-23 |
| JP2002533566A (ja) | 2002-10-08 |
| BR9916269A (pt) | 2001-09-04 |
| RO121135B1 (ro) | 2006-12-29 |
| SI20533A (sl) | 2001-10-31 |
| EA200100563A1 (ru) | 2001-12-24 |
| ES2205916T3 (es) | 2004-05-01 |
| CA2356370A1 (fr) | 2000-06-29 |
| EA003345B1 (ru) | 2003-04-24 |
| KR20010101205A (ko) | 2001-11-14 |
| CZ20012225A3 (cs) | 2002-02-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2000118035A (ru) | Способ запуска процесса прямой плавки | |
| FR2564863A1 (fr) | Procede d'elaboration d'un alliage ferreux a haute teneur en manganese par fusion reductrice. | |
| EP1141422B1 (de) | Verfahren zur denitrierung von geschmolzenem stahl während des frischprozesses | |
| FR2476140A1 (fr) | Procede pour la production d'acier a haute teneur en chrome | |
| FR2501236A1 (fr) | Procede d'affinage d'aciers a forte teneur en chrome | |
| FR2463187A1 (fr) | Procede de fabrication d'acier dans un convertisseur avec soufflage d'oxygene sur la surface du metal fondu et soufflage de gaz d'agitation par la base du convertisseur | |
| EP0342132A1 (de) | Verfahren zur Entschwefelung von Roheisen | |
| EP1029089B1 (de) | Verfahren zum kontinuierlichen schmelzen von metallischen feststoffen | |
| FR2546182A1 (fr) | Procede de production d'acier contenant du chrome a faible teneur en p | |
| EP1268863B1 (de) | Vakuumbehandlung von metallschmelze mit gleichzeitigem einblasen von heliumgas | |
| FR2939448A1 (fr) | Procede de production d'une atmosphere gazeuse pour le traitement des metaux. | |
| FR2541313A1 (fr) | Procede pour la production d'acier inoxydable fondu | |
| BE1003182A4 (fr) | Procede de fabrication de l'acier d'usage courant. | |
| JP2897647B2 (ja) | 低水素極低硫鋼の溶製方法 | |
| EP0028968A1 (de) | Verfahren zum Behandeln eines Metalls in einem Schmelzbad | |
| FR2528872A1 (fr) | Procede de fabrication du nickel metallique a partir d'une matiere premiere oxydee nickelifere | |
| BE879594A (fr) | Procede de fabrication d'acier | |
| EP0031776A1 (de) | Kombiniertes Blasverfahren zum Frischen von Metallen im Konverter | |
| FR2472616A1 (fr) | Procede de soufflage mixte pour l'affinage des metaux au convertisseur | |
| EP0156706A1 (de) | Verfahren zum Feinen von Metallen durch Einblasen | |
| BE533249A (de) | ||
| BE889593A (fr) | Procede de traitement d'alliages | |
| BE834767A (fr) | Procede pour enrichir des ferro-alliages en elements non ferreux tels que le nickel et/ou le cobalt | |
| BE885044A (fr) | Procede perfectionne pour l'affinage pneumatique de fonte hematite ou phosphoreuse au convertisseur | |
| FR2459835A1 (fr) | Procede de traitement de fontes liquides permettant d'accroitre la proportion de riblons dans le convertisseur |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 20010612 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
| AX | Request for extension of the european patent |
Free format text: AL PAYMENT 20010612;LT;LV;MK;RO;SI |
|
| 17Q | First examination report despatched |
Effective date: 20011004 |
|
| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
| AX | Request for extension of the european patent |
Extension state: AL |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20030806 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20030806 |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
| REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D Free format text: FRENCH |
|
| REF | Corresponds to: |
Ref document number: 69910256 Country of ref document: DE Date of ref document: 20030911 Kind code of ref document: P |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20031106 Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20031106 |
|
| REG | Reference to a national code |
Ref country code: SE Ref legal event code: TRGR |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20031217 |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 20031205 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20031231 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20031231 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20031231 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20040106 |
|
| LTIE | Lt: invalidation of european patent or patent extension |
Effective date: 20030806 |
|
| REG | Reference to a national code |
Ref country code: IE Ref legal event code: FD4D |
|
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2205916 Country of ref document: ES Kind code of ref document: T3 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed |
Effective date: 20040507 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: LU Payment date: 20131125 Year of fee payment: 15 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20131121 Year of fee payment: 15 Ref country code: AT Payment date: 20131121 Year of fee payment: 15 Ref country code: GB Payment date: 20131125 Year of fee payment: 15 Ref country code: SE Payment date: 20131125 Year of fee payment: 15 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20131209 Year of fee payment: 15 Ref country code: NL Payment date: 20131122 Year of fee payment: 15 Ref country code: IT Payment date: 20131126 Year of fee payment: 15 Ref country code: BE Payment date: 20131121 Year of fee payment: 15 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20131219 Year of fee payment: 15 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141231 |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 69910256 Country of ref document: DE |
|
| REG | Reference to a national code |
Ref country code: NL Ref legal event code: V1 Effective date: 20150701 |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 69910256 Country of ref document: DE Representative=s name: HOEGER, STELLRECHT & PARTNER PATENTANWAELTE MB, DE |
|
| REG | Reference to a national code |
Ref country code: NL Ref legal event code: V1 Effective date: 20150701 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141217 Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141218 |
|
| REG | Reference to a national code |
Ref country code: SE Ref legal event code: EUG |
|
| REG | Reference to a national code |
Ref country code: AT Ref legal event code: MM01 Ref document number: 246734 Country of ref document: AT Kind code of ref document: T Effective date: 20141217 |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20141217 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20150831 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150701 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150701 Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141217 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141231 Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141217 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141217 |
|
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20160126 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141218 |