EP0093039A1 - Verfahren zur Erhöhung der Gasdurchlässigkeit von feuerfesten Elementen im Boden von metallurgischen Gefässen sowie hierfür geeignetes Material - Google Patents
Verfahren zur Erhöhung der Gasdurchlässigkeit von feuerfesten Elementen im Boden von metallurgischen Gefässen sowie hierfür geeignetes Material Download PDFInfo
- Publication number
- EP0093039A1 EP0093039A1 EP83400765A EP83400765A EP0093039A1 EP 0093039 A1 EP0093039 A1 EP 0093039A1 EP 83400765 A EP83400765 A EP 83400765A EP 83400765 A EP83400765 A EP 83400765A EP 0093039 A1 EP0093039 A1 EP 0093039A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- concrete
- container
- refractory
- elements
- ensure
- 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
- 230000008569 process Effects 0.000 title claims abstract description 8
- 239000000463 material Substances 0.000 title description 2
- 239000004567 concrete Substances 0.000 claims abstract description 39
- 239000012530 fluid Substances 0.000 claims abstract description 19
- 238000007664 blowing Methods 0.000 claims abstract description 16
- 230000035699 permeability Effects 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000001301 oxygen Substances 0.000 claims abstract description 8
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 8
- 238000011282 treatment Methods 0.000 claims abstract description 5
- 238000009826 distribution Methods 0.000 claims abstract description 3
- 238000002347 injection Methods 0.000 claims abstract description 3
- 239000007924 injection Substances 0.000 claims abstract description 3
- 239000011819 refractory material Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 2
- 238000003892 spreading Methods 0.000 claims description 2
- 238000007670 refining Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 229910000514 dolomite Inorganic materials 0.000 description 2
- 239000010459 dolomite Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229940082150 encore Drugs 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011823 monolithic refractory Substances 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000000803 paradoxical effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000008646 thermal stress 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
-
- 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
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- 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
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
-
- 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
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/0003—Linings or walls
- F27D1/003—Linings or walls comprising porous bricks
-
- 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
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/161—Introducing a fluid jet or current into the charge through a porous element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/02—Preheating, e.g. in a laminating line
- F27M2003/025—Drying
Definitions
- the present invention relates to the field of the production of metals, in particular steel. It relates more precisely to metallurgical vessels, particularly refining converters, the bottom of which is provided with permeable refractory elements.
- Metallurgical treatments consist in subjecting a bath of molten metal to pneumatic stirring by controlled injection of a stirring fluid, usually an inert gas such as nitrogen or argon, through permeable refractory elements. incorporated into the usual refractory lining of the container containing the bath and opening below the surface of the latter. More generally, these blowing elements are housed in the bottom of the container (FR-A-2,322,202, US No. 3,259,484).
- a stirring fluid usually an inert gas such as nitrogen or argon
- the subject of the invention is a treatment method for improving the permeability of the bottoms of metallurgical vessels, in particular steel converters with top blowing oxygen blowing, said bottoms being provided with permeable refractory elements for the controlled introduction of a stirring fluid into the bath of molten metal contained in the container, process characterized in that, after emptying the container of its content at the end of the refining of any load, a concrete of refractory material compatible with the refractory material constituting the bottom is deposited in the bottom, said concrete having sufficient fluidity to ensure its spread over the bottom; and in that the concrete is left to dry and ensure its setting, while maintaining in the permeable refractory elements a sufficient pressure to provide a permanent flow of mixing fluid.
- well cast refractory concrete is prepared, capable of reaching the bottom of the container from the spout by flowing along the side wall; this concrete is poured into the container through the spout, the container being in an inclined position, for example in an intermediate position between the upright position and the completely tilted position which it presents at the end of casting of the molten metal, then it is straightened to vertical to ensure the distribution of the concrete on the bottom and the concrete is allowed to dry and ensure its setting, while maintaining in the permeable refractory elements a sufficient pressure to ensure a flow of mixing fluid.
- the container can be tilted on either side of its vertical position to perfect the spreading of the concrete on the bottom.
- the metallurgical container is a refining converter for oxygen blown from above by means of an upright vertical lance, it being understood that the invention also applies to any other metallurgical container, for example, pockets or arc furnaces.
- a concrete of refractory material compatible with the refractory material constituting the bottom is intended to denote any refractory material capable, taking into account the nature of the bottom, of sticking to the latter during its solidification. It is for example a magnesian concrete if the bottom has a predominance in magnesia, or a dolomitic concrete if the bottom is based on dolomite, etc ...
- well pourable refractory concrete is meant to qualify a preparation of the latter which makes it more fluid than the fluidity which would result from a preparation in accordance with the prescriptions of the concrete manufacturer.
- this concrete is generally a question of making this concrete very moist, that is to say containing an excess of water compared to the usual prescriptions so as to achieve a content of the order of 10% by weight.
- the lower limit of the humidity rate to be adopted must take into account the capacity, that is to say the size of the container, in particular its height and the diameter of the bottom, as well as its thermal mass, so that the concrete can, by being introduced by the upper open end (the spout) reach the bottom, then once the bottom is reached, spread there before solidifying.
- the water content is preferably between 8 and 10% by weight, that is to say 1 to 2 points more than that that the manufacturer recommends as much as possible (up to 7 ⁇ , but more generally between 3 and 6%).
- the method according to the invention is simple, inexpensive, and poses no uncontrolled difficulty.
- the presence of elé permeable refractory elements housed in the bottom does not imply any other requirement during the drying of the concrete than that which consists in maintaining through them a minimum flow of mixing fluid, a flow which can be described as "safety”.
- the concrete is in mechanical engagement on the bottom and forms a refractory layer which can reach in the central area, an average thickness of between 5 and 20 cm approximately (240 t converter).
- the converter is then ready for processing new loads. It is noted from the first treated load that, not only is the permeability of the bottom preserved, but that it has also very significantly increased compared to the level it had before the concrete was added.
- a possible indicator of the "level" of permeability can be constituted by the pressure / flow ratio of stirring fluid in the supply line of the latter to the permeable refractory element. This ratio can be determined from a reference value, the permeable element being taken in new condition with vacuum blowing or during the refining of the first charge to the converter.
- the mixing fluid being able to circulate on the one hand laterally in areas of lesser pressure drop which possibly form at the interface of the deposited concrete layer and the pre-existing refractory bottom.
- the technique according to the invention can be implemented at any time, both between two refining campaigns, and between two charges of the same campaign, or even before the first charge, on a converter in the state new.
- the invention applies whatever the type of permeable refractory elements mounted in the bottom. It should be emphasized, however, that excellent results have been obtained with elements such as those mentioned at the start, and of which one can have more knowledge by referring to the detailed description which is made of it in the European patent application n ° 0021861 already cited.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Fire-Extinguishing Compositions (AREA)
- Ceramic Products (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT83400765T ATE34774T1 (de) | 1982-04-22 | 1983-04-18 | Verfahren zur erhoehung der gasdurchlaessigkeit von feuerfesten elementen im boden von metallurgischen gefaessen sowie hierfuer geeignetes material. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8207117A FR2525632A1 (fr) | 1982-04-22 | 1982-04-22 | Procede de traitement pour ameliorer la permeabilite des fonds de recipients metallurgiques pourvus d'elements refractaires permeables, et materiaux pour sa mise en oeuvre |
FR8207117 | 1982-04-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0093039A1 true EP0093039A1 (de) | 1983-11-02 |
EP0093039B1 EP0093039B1 (de) | 1988-06-01 |
Family
ID=9273359
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83400765A Expired EP0093039B1 (de) | 1982-04-22 | 1983-04-18 | Verfahren zur Erhöhung der Gasdurchlässigkeit von feuerfesten Elementen im Boden von metallurgischen Gefässen sowie hierfür geeignetes Material |
Country Status (14)
Country | Link |
---|---|
US (2) | US4696456A (de) |
EP (1) | EP0093039B1 (de) |
JP (1) | JPS59104418A (de) |
KR (1) | KR910003514B1 (de) |
AT (1) | ATE34774T1 (de) |
BE (1) | BE896538A (de) |
BR (1) | BR8302046A (de) |
CA (1) | CA1206007A (de) |
DE (1) | DE3376850D1 (de) |
ES (2) | ES8402617A1 (de) |
FR (1) | FR2525632A1 (de) |
IT (1) | IT1194213B (de) |
LU (1) | LU84741A1 (de) |
ZA (1) | ZA832761B (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2525632A1 (fr) * | 1982-04-22 | 1983-10-28 | Siderurgie Fse Inst Rech | Procede de traitement pour ameliorer la permeabilite des fonds de recipients metallurgiques pourvus d'elements refractaires permeables, et materiaux pour sa mise en oeuvre |
DE4221101C2 (de) * | 1992-06-26 | 1994-05-05 | Veitsch Radex Ag | Verwendung einer feuerfesten keramischen Masse zur Auskleidung von Böden an Elektro-Lichtbogenöfen |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3259484A (en) * | 1962-04-16 | 1966-07-05 | Loire Atel Forges | Method and apparatus for producing steel from pig iron |
DE2100847A1 (en) * | 1970-01-15 | 1971-07-22 | Bate M | Coating the insides of metallurgical fur-naces |
FR2322202A1 (fr) * | 1975-08-29 | 1977-03-25 | Siderurgie Fse Inst Rech | Procede d'elaboration d'acier par soufflage d'oxygene |
DE2912771A1 (de) * | 1979-03-30 | 1980-10-09 | Stahl Consulting Gmbh | Verfahren zum trocken-spritzauskleiden |
EP0021861A1 (de) * | 1979-04-25 | 1981-01-07 | INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID) France | Gasdurchlässiger Körper aus feuerfestem Material und Verfahren zu seiner Herstellung |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT977989B (it) * | 1972-01-03 | 1974-09-20 | Uss Eng & Consult | Metodo per la preparazione di una suola amovibile colata per un for no usato nella produzione di ac ciaio |
NL176088B (nl) * | 1978-07-14 | 1984-09-17 | Estel Hoogovens Bv | Werkwijze voor het bedrijven van een staalconverter en een staalconverter te gebruiken hierbij. |
JPS5585618A (en) * | 1978-12-22 | 1980-06-27 | Kawasaki Heavy Ind Ltd | Coating method for converter with refractory material |
US4298378A (en) * | 1978-12-22 | 1981-11-03 | Kawasaki Jukogyo Kabushiki Kaisha | Rotary steel converter, method of making steel there-with and method of applying refractory lining to converter |
FR2525632A1 (fr) * | 1982-04-22 | 1983-10-28 | Siderurgie Fse Inst Rech | Procede de traitement pour ameliorer la permeabilite des fonds de recipients metallurgiques pourvus d'elements refractaires permeables, et materiaux pour sa mise en oeuvre |
-
1982
- 1982-04-22 FR FR8207117A patent/FR2525632A1/fr active Granted
-
1983
- 1983-04-11 LU LU84741A patent/LU84741A1/fr unknown
- 1983-04-18 AT AT83400765T patent/ATE34774T1/de active
- 1983-04-18 DE DE8383400765T patent/DE3376850D1/de not_active Expired
- 1983-04-18 EP EP83400765A patent/EP0093039B1/de not_active Expired
- 1983-04-19 ZA ZA832761A patent/ZA832761B/xx unknown
- 1983-04-20 BR BR8302046A patent/BR8302046A/pt not_active IP Right Cessation
- 1983-04-20 US US06/486,845 patent/US4696456A/en not_active Expired - Fee Related
- 1983-04-21 CA CA000426383A patent/CA1206007A/fr not_active Expired
- 1983-04-21 BE BE6/47816A patent/BE896538A/fr not_active IP Right Cessation
- 1983-04-21 ES ES521716A patent/ES8402617A1/es not_active Expired
- 1983-04-21 ES ES521715A patent/ES521715A0/es active Granted
- 1983-04-22 IT IT20767/83A patent/IT1194213B/it active
- 1983-04-22 JP JP58071331A patent/JPS59104418A/ja active Granted
- 1983-04-22 KR KR1019830001713A patent/KR910003514B1/ko not_active IP Right Cessation
-
1987
- 1987-05-20 US US07/052,755 patent/US4779846A/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3259484A (en) * | 1962-04-16 | 1966-07-05 | Loire Atel Forges | Method and apparatus for producing steel from pig iron |
DE2100847A1 (en) * | 1970-01-15 | 1971-07-22 | Bate M | Coating the insides of metallurgical fur-naces |
FR2322202A1 (fr) * | 1975-08-29 | 1977-03-25 | Siderurgie Fse Inst Rech | Procede d'elaboration d'acier par soufflage d'oxygene |
DE2912771A1 (de) * | 1979-03-30 | 1980-10-09 | Stahl Consulting Gmbh | Verfahren zum trocken-spritzauskleiden |
EP0021861A1 (de) * | 1979-04-25 | 1981-01-07 | INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID) France | Gasdurchlässiger Körper aus feuerfestem Material und Verfahren zu seiner Herstellung |
Also Published As
Publication number | Publication date |
---|---|
ES8402616A1 (es) | 1984-02-01 |
KR840004455A (ko) | 1984-10-15 |
BE896538A (fr) | 1983-08-16 |
BR8302046A (pt) | 1983-12-27 |
ES521716A0 (es) | 1984-02-01 |
IT1194213B (it) | 1988-09-14 |
CA1206007A (fr) | 1986-06-17 |
FR2525632A1 (fr) | 1983-10-28 |
KR910003514B1 (ko) | 1991-06-03 |
FR2525632B1 (de) | 1984-08-24 |
EP0093039B1 (de) | 1988-06-01 |
ATE34774T1 (de) | 1988-06-15 |
ES8402617A1 (es) | 1984-02-01 |
ES521715A0 (es) | 1984-02-01 |
JPH0368925B2 (de) | 1991-10-30 |
LU84741A1 (fr) | 1983-12-05 |
US4696456A (en) | 1987-09-29 |
US4779846A (en) | 1988-10-25 |
ZA832761B (en) | 1983-12-28 |
DE3376850D1 (en) | 1988-07-07 |
IT8320767A0 (it) | 1983-04-22 |
JPS59104418A (ja) | 1984-06-16 |
IT8320767A1 (it) | 1984-10-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
FR2564011A1 (fr) | Panier de coulee continue dote de fonctions de reacteur pour les traitements realises en dehors du four | |
EP0093040B1 (de) | Verfahren zur Verlängerung der Haltbarkeit feuerfester gasdurchlässiger Elemente im Boden metallurgischer Gefässe, insbesondere bei Sauerstoffaufblaskonvertern für Stahl | |
EP0093039B1 (de) | Verfahren zur Erhöhung der Gasdurchlässigkeit von feuerfesten Elementen im Boden von metallurgischen Gefässen sowie hierfür geeignetes Material | |
EP1323837B1 (de) | Herstellungsverfahren von Stahlprodukt aus Kohlenstoffstahl insbesondere für Galvanisieren. | |
Bannenberg et al. | Improvements in steel cleanliness by tundish inertisation | |
FR2512186A1 (fr) | Procede de garnissage de fours electriques d'elaboration d'acier | |
EP0028569A1 (de) | Verfahren zum Spülen einer Metallschmelze durch Einblasen von Gas | |
FR2593520A1 (fr) | Procede d'elimination de soufre et d'hydrogene de l'acier | |
SU1211325A1 (ru) | Способ модифицировани железоуглеродистых сплавов | |
BE341896A (de) | ||
EP0223722A1 (de) | Verfahren und Vorrichtung zum Einblasen von pulverigen Zusätzen in den Strahl einer Metallschmelze unter vermindertem Druck | |
LU83694A1 (fr) | Perfectionnements aux procedes d'affinage de la fonte | |
RU2031136C1 (ru) | Способ раскисления и легирования кремнистой стали | |
SU1242530A1 (ru) | Способ производства стали | |
FR2576320A1 (fr) | Procede de traitement de metaux ferreux liquides par fil fourre contenant du calcium | |
SU1638177A1 (ru) | Способ производства слитков | |
FR2767725A1 (fr) | Cylindre de travail composite pour le laminage a chaud & a froid en acier rapide a haut carbone et haut vanadium et son procede de fabrication par coulee centrifuge | |
BE1005411A6 (fr) | Procede pour conditionner la composition des scories. | |
BE560514A (de) | ||
BE699164A (de) | ||
BE851148A (fr) | Procede de coulee continue des metaux | |
BE436791A (de) | ||
BE851147A (de) | ||
EP0613956A1 (de) | Verfahren zum Herstellen von Grauguss für die Oberflächenumschmelzbehandlung | |
BE903233A (fr) | Procede de fabrication de metaux, en particulier d'acier, a partir de minerais contenant des oxydes |
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 |
|
AK | Designated contracting states |
Designated state(s): AT DE GB NL SE |
|
17P | Request for examination filed |
Effective date: 19840428 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT DE GB NL SE |
|
REF | Corresponds to: |
Ref document number: 34774 Country of ref document: AT Date of ref document: 19880615 Kind code of ref document: T |
|
REF | Corresponds to: |
Ref document number: 3376850 Country of ref document: DE Date of ref document: 19880707 |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) | ||
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 | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19900112 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 19910201 Year of fee payment: 9 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19910419 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19910430 Year of fee payment: 9 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Effective date: 19920418 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19921101 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee | ||
EUG | Se: european patent has lapsed |
Ref document number: 83400765.0 Effective date: 19911108 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19980312 Year of fee payment: 16 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19980318 Year of fee payment: 16 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990418 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19990418 |
|
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: 20000201 |