EP0031776B1 - Kombiniertes Blasverfahren zum Frischen von Metallen im Konverter - Google Patents
Kombiniertes Blasverfahren zum Frischen von Metallen im Konverter Download PDFInfo
- Publication number
- EP0031776B1 EP0031776B1 EP80401847A EP80401847A EP0031776B1 EP 0031776 B1 EP0031776 B1 EP 0031776B1 EP 80401847 A EP80401847 A EP 80401847A EP 80401847 A EP80401847 A EP 80401847A EP 0031776 B1 EP0031776 B1 EP 0031776B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blowing
- oxygen
- flow
- bottom upwards
- blown
- 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
Links
- 238000007664 blowing Methods 0.000 title claims description 85
- 238000000034 method Methods 0.000 title claims description 25
- 238000007670 refining Methods 0.000 title claims description 22
- 229910052751 metal Inorganic materials 0.000 title claims description 19
- 239000002184 metal Substances 0.000 title claims description 19
- 150000002739 metals Chemical class 0.000 title claims description 3
- 239000001301 oxygen Substances 0.000 claims description 114
- 229910052760 oxygen Inorganic materials 0.000 claims description 114
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 105
- 239000007789 gas Substances 0.000 claims description 43
- 238000003756 stirring Methods 0.000 claims description 25
- 230000008569 process Effects 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 239000002893 slag Substances 0.000 claims description 12
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 9
- 150000002926 oxygen Chemical class 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 229910001208 Crucible steel Inorganic materials 0.000 claims 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 36
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 23
- 229910052786 argon Inorganic materials 0.000 description 18
- 239000000843 powder Substances 0.000 description 18
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 14
- 235000011941 Tilia x europaea Nutrition 0.000 description 14
- 239000004571 lime Substances 0.000 description 14
- 229910001018 Cast iron Inorganic materials 0.000 description 13
- 230000008901 benefit Effects 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 238000005261 decarburization Methods 0.000 description 8
- 238000002156 mixing Methods 0.000 description 8
- 230000007935 neutral effect Effects 0.000 description 8
- 229910000805 Pig iron Inorganic materials 0.000 description 7
- 239000003517 fume Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000001590 oxidative effect Effects 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 238000007792 addition Methods 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 229910052595 hematite Inorganic materials 0.000 description 4
- 239000011019 hematite Substances 0.000 description 4
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 4
- 239000003223 protective agent Substances 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 235000013980 iron oxide Nutrition 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 206010001488 Aggression Diseases 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 241001275902 Parabramis pekinensis Species 0.000 description 1
- 230000003416 augmentation Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 229940082150 encore Drugs 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- -1 that is to say Chemical compound 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
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
Definitions
- the present invention relates to a process for introducing refining gas and brewing gas into metal refining converters, and more particularly into steelworks converters.
- the second type of pure oxygen blowing in a steelworks converter consists in using nozzles, vertical or oblique, arranged in the refractory bottom of the converter, blowing from bottom to top, and made up of at least two concentric tubes, the (or) inner tube blowing an oxidizing gas, which can be pure oxygen, the outer tube being traversed by a protective agent of the nozzle against its wear in service.
- the object of the present invention is to produce a mixed blowing, simultaneously from above and from below, which, combining the advantages of blowing by lance and blowing by nozzles, also makes it possible to significantly improve the life of the bottoms to nozzles thus used in such a mixed blowing.
- the subject of the present invention is a process for blowing oxidizing gases, and in particular pure oxygen, for refining metals, and. more specifically for the refining of cast iron in a converter, by means of a hand from a lance blowing from top to bottom, and simultaneously on the other hand by means of protected nozzles blowing, vertically or obliquely, bottom to top, characterized both in that the quantity of oxygen blown from bottom to top by the nozzles is between 3% and 25% of the total quantity of oxygen necessary for refining the metal bath, in this that this oxygen is blown from bottom to top at practically constant flow or decreasing flow, that is to say at non-increasing flow, in that one can add to this oxygen blown from bottom to top a stirring gas, neutral or oxidant, the flow rate of which varies according to the various stages of blowing and may even be zero at certain times, so that the total amount of oxygen blown from bottom to top by the nozzles remains between 3% and 25% of the total amount of oxygen necessary for
- the brewing gas can be a neutral gas, such as nitrogen or argon, or a mixture of argon, that is to say, argon containing a little oxygen and not containing all other than trace gases.
- This brewing gas can also be an oxidizing gas, such as carbon dioxide or water vapor, the dissociation products of which other than oxygen (carbon monoxide for the first, hydrogen for the second) cause an effect. bath brewing.
- an oxidizing gas such as carbon dioxide or water vapor
- the flow rate of oxygen blown through the nozzles is kept constant throughout the duration of the blowing.
- the flow of oxygen blown through the nozzles is at a decreasing flow throughout the duration of the blowing or only from a certain time. It can also be decreasing first, and constant thereafter.
- a stirring gas there is added to the oxygen blown by the nozzles a stirring gas, and this for two periods: a first period of a few minutes at the critical moment of the decarburization projections which may be located in the second quarter of high phosphorus cast iron conversion, and in the third quarter into hematite cast iron; and a second period, quite short, of one to three minutes, towards the end of the blowing, at low carbon contents, period during which the instantaneous rate of wear of the nozzles increases rapidly if one blows from the pure oxygen.
- the flow rate of oxygen blown through the nozzles is adjusted decreasingly, it may be advisable to compensate for the decrease in the flow rate of oxygen by an equal increase in the flow rate of the mixing gas, so that the Total gas flow blown from the nozzles from bottom to top remains constant.
- the jets of oxygen blown from bottom to top have a diameter at most equal to 18 mm, and preferably at most equal to 12 mm, at the outlet of the nozzles. It is understood that these nozzles are protected against wear in a known manner by a protective peripheral agent, such as a hydrocarbon gas, or fuel oil, or water vapor, or car dioxide. gaseous or liquid bone, etc.
- a protective peripheral agent such as a hydrocarbon gas, or fuel oil, or water vapor, or car dioxide. gaseous or liquid bone, etc.
- the nozzles usually used in the processes of integral blowing from the bottom have a passage diameter for oxygen generally between 28 mm and 36 mm.
- the protective agent of the nozzles against wear possibly participates in the stirring of the bath but only to a small extent, because the flow rate of the protective agent is always very low compared to the flow rate of blown oxygen.
- the total amount of oxygen blown from bottom to top by the nozzles is between 3% and 10% of the total amount of oxygen necessary for refining the metal bath.
- the pulverulent materials, such as lime powder or limestone powder, to be introduced into the metal bath are introduced in suspension in the oxygen of the lance, and as the latter does not represents that a fraction of the total oxygen necessary for the complete refining of the metal bath, the concentration of pulverulent matters in oxygen can be notably higher than in the processes of integral blowing by lance, which contributes, by cooling the oxygen reaction zone of the lance in the bath, to reduce the quantity of red fumes due to this oxygen.
- the flow rate of oxygen blown from bottom to top, and, optionally, the flow rate of additional stirring gas are regulated at each instant as a function of the oxidation state of the slag, evaluated either by an overall estimate from known elements, or by dosing of samples taken by a sublance, with measurement of the bath temperature, or by means of a device for measuring the intensity of the sound produced by the converter , in order to control at all times the difference in the balance between slag and metal bath.
- the number and the diameter of the nozzles are calculated as a function of the flow rates envisaged for the oxygen blown from bottom to top, with or without stirring gas, and for a usual pressure for blowing from the bottom, the total passage section oxygen in all the nozzles is generally between the thirtieth and a quarter of the passage section necessary in the blowing processes integrated from bottom to top through the nozzles.
- the oxygen blown through the nozzles must represent 20% of the total oxygen, or 1/5
- the protected nozzles blow 20% of the total oxygen required, or 13 Nm3 per ton of pig iron.
- the red smoke is reduced ⁇ but not suppressed ⁇ due to this relatively high concentration of powder and also the use of castine powder.
- Protected nozzles blowing 7% of total oxygen i.e. 4 Nm3 per ton of pig iron. They have a passage diameter for oxygen of 11 millimeters and are three in number. At a pressure of 10 8 effective Pascals, they are capable of a gas flow of 6.7 Nm3 / min per nozzle, or 20 Nm3 / min for the 3 nozzles.
- This oxygen is accompanied by:
- Red fumes are reduced, but to a lesser extent than in the previous example, because, on the one hand, the proportion of oxygen blown by the lance is higher than in the previous example, and d 'on the other hand it is a hematita cast iron, which requires less lime for its refining.
- the joint effects of the small diameter of the nozzles, of the decrease in the oxygen flow rate per nozzle compared to a normal blast nozzle at the bottom, of the decrease in the oxygen flow rate at the end of blowing, and of the final addition of the stirring gas, during the period of greatest wear of the nozzles means that the behavior of the nozzles and of the bottoms is much improved compared to that of the nozzles and of the bottoms of processes with integral blowing from the bottom.
- the improvement is also notable compared to known mixed processes.
- a final advantage of the mixed blowing according to the invention can manifest itself in many cases, at the beginning of the blowing.
- priming the oxygen jet of the lance, on the surface of a more or less frozen metal bath, more or less charged with scrap, lime, etc. is difficult.
- the initiation of refining reactions by oxygen from the nozzles is always instantaneous.
- a particular characteristic of the mixed blowing according to the invention consists in starting the blowing for a few seconds only with the oxygen from the nozzles blowing from bottom to top, regulated at a high flow rate, for example at the maximum of the oxygen pressure available , and then to introduce the oxygen from the lance, while then bringing the oxygen from the nozzles to its normal operating rate.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Claims (11)
1. Blasverfahren mit oxydierenden Gasen, insbesondere reinem Sauerstoff, zum Frischen von Metallen, insbesondere zum Frischen von - Stahlschmelze, in einem Konverter, mittels einerseits einer Lanze, die von oben nach unten bläst, und anderseits geschützten Düsen, die vertikal oder schräg von unten nach oben blasen, dadurch gekennzeichnet, daß gleichzeitig die von den Düsen von unten nach oben eingeblasene Sauerstoffmenge 3-25% der gasamten, zum Frischen des Metallbades erforderlichen Sauerstoffmenge beträgt, daß dieser Sauerstoff von unten nach oben in einer nicht ansteigenden Menge eingeblasen wird, daß diesem von unten nach oben eingeblasenen Sauerstoff zu bestimmten Zeitpunkten des Blasvorgangs ein neutrales oder oxydierendes Rührgas so zugesetzt wird, daß die gesamte, durch die Düsen von unten nach oben eingeblasene Sauerstoffmenge zwischen 3-25% der gesamten, zum Frischen des Metallbades erforderlichen Sauerstoffmenge verbleibt und die gesamte, durch die Düsen eingeblasene Sauerstoffmenge nicht ansteigt, und daß die von unten nach oben engeblasenen, gegebenenfalls mit einem Rührgas versetzten Sauerstoffstrahlen einen Durchmesser von höchstens 18 mm gemessen am Auslaß der Düsen aufweisen.
2. Blasverfahren nach Anspruch 1, dadurch gekennzeichnet, daß die durch die Düsen von unten nach oben eingeblasene Sauerstoffmenge während des gesamten Blasvorgangs konstant gehalten wird.
3. Blasverfahren nach Anspruch 1, dadurch gekennzeichnet, daß die durch die Düsen von unten nach oben eingeblasene Sauerstoffmenge während des desamten Blasvorgangs abnehmend geregelt wird.
4. Blasverfahren nach Anspruch 1, dadurch gekenzeichnet, daß die durch die Düsen von unten nach oben eingeblasene Sauerstoffmenge während der ersten Phase des Blasvorgangs konstant gehalten und während der zweiten Phase des Blasvorgangs abnehmend geregelt wird, oder umgekehrt.
5. Blasverfahren nach einem der Ansprüche 1-4, dadurch gekennzeichnet, daß das Rührgas dem durch die Düsen von unten nach oben eingeblasenen Sauerstoff während zweier bestimmter Perioden zugemischt wird: einer ersten Periode im kritischen Augenblick des Auswurfs (Kochen) bei der Entkohlung, einer zweiten Periode gegen Ende des Blasvorgangs.
6. Blasverfahren nach Anspruch 5, dadurch gekennzeichnet, daß die Rührgasmenge während der zweiten Periode gegen Ende der Umwandlung ansteigt.
7. Blasverfahren nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß gegen Ende des Blasvorgangs das Ansteigen der Rührgasmenge so geregelt wird, daß dadurch genau die Verringerung der von unten nach oben eingeblasenen Sauerstoffmenge kompensiert wird, sodaß die Gesamtmenge konstant bleibt.
8. Blasverfahren nach einem der Ansprüche 1-7, dadurch gekennzeichnet, daß die gegebenenfalls mit einem Rührgas vermischten, von unten nach oben eingeblasenen Sausrstoffstrahlen einen Durchmesser von höchstens 12 mm, gemessen am Auslaß der Düsen, aufweisen.
9. Blasverfahren nach Anspruch 8, dadurch gekennzeichnet, daß die Gesamtmenge an durch die Düsen von unten nach oben eingeblasenem Sauerstoff 3-1096 der Gesamtmenge an Sauerstoff beträgt, die zum Frischen des Metallbades erforderlich ist.
10. Blasverfahren nach einem der Ansprüche 1-9, dadurch gekennzeichnet, daß die von unten nach oben eingeblasene Sauerstoffmenge und gegebenenfalls die zusätzliche Menge an Rührgas zu jedem Zeitpunkt in Abhängigkeit vom Oxydationszustand der Schlacke geregelt wird, um zu jedem Zeitpunkt die Abweichung vom Gleichgewicht zwischen Schlacke und Metallbad unter Kontrolle halten zu können.
11. Blasverfahren nach einem der Ansprüche 1-10, dadurch gekennzeichnet, daß zu Beginn des Blasvorgangs einige Sekunden lang nur Sauerstoff in großen Mengen durch die Düsen von unten nach oben eingeblasen wird, daß darauf der Sauerstoff durch die Lanze zugeführt wird und daß bald darauf die durch die Düsen eingeblasene Sauerstoffmenge auf ihren normalen Wert eingestellt wird.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT80401847T ATE3445T1 (de) | 1979-12-28 | 1980-12-23 | Kombiniertes blasverfahren zum frischen von metallen im konverter. |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7931990A FR2472616A1 (fr) | 1979-12-28 | 1979-12-28 | Procede de soufflage mixte pour l'affinage des metaux au convertisseur |
| FR7931990 | 1979-12-28 | ||
| FR8003091 | 1980-02-12 | ||
| FR8003091A FR2475574A2 (fr) | 1980-02-12 | 1980-02-12 | Procede de soufflage mixte pour l'affinage de la fonte acier au convertisseur " d'acierie " |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0031776A1 EP0031776A1 (de) | 1981-07-08 |
| EP0031776B1 true EP0031776B1 (de) | 1983-05-18 |
Family
ID=26221519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80401847A Expired EP0031776B1 (de) | 1979-12-28 | 1980-12-23 | Kombiniertes Blasverfahren zum Frischen von Metallen im Konverter |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4328031A (de) |
| EP (1) | EP0031776B1 (de) |
| AU (1) | AU541719B2 (de) |
| BR (1) | BR8007499A (de) |
| CA (1) | CA1157658A (de) |
| DD (1) | DD154026A5 (de) |
| DE (1) | DE3063382D1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4599107A (en) * | 1985-05-20 | 1986-07-08 | Union Carbide Corporation | Method for controlling secondary top-blown oxygen in subsurface pneumatic steel refining |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1151053A (fr) * | 1956-05-29 | 1958-01-23 | Procédé de conversion de fonte en acier | |
| FR1344238A (fr) * | 1962-04-16 | 1963-11-29 | Cie Des Ateliers & Forges De L | Procédé et dispositifs d'élaboration de l'acier |
| FR1478478A (fr) * | 1966-03-03 | 1967-04-28 | Loire Atel Forges | Fond de convertisseur d'aciérie et procédé d'élaboration de l'acier mettant en oeuvre un tel fond |
| FR2217422A1 (de) * | 1973-02-12 | 1974-09-06 | Voest Ag | |
| FR2322202A1 (fr) * | 1975-08-29 | 1977-03-25 | Siderurgie Fse Inst Rech | Procede d'elaboration d'acier par soufflage d'oxygene |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2158140A1 (en) * | 1971-11-05 | 1973-06-15 | Creusot Loire | Steel making - by top and bottom blowing oxygen with a fluid contg hydrocarbons |
| US3854932A (en) * | 1973-06-18 | 1974-12-17 | Allegheny Ludlum Ind Inc | Process for production of stainless steel |
| GB1586762A (en) * | 1976-05-28 | 1981-03-25 | British Steel Corp | Metal refining method and apparatus |
| DE2737832C3 (de) * | 1977-08-22 | 1980-05-22 | Fried. Krupp Huettenwerke Ag, 4630 Bochum | Verwendung von im Querschnitt veränderlichen Blasdüsen zur Herstellung von rostfreien Stählen |
-
1980
- 1980-07-15 DD DD80222621A patent/DD154026A5/de unknown
- 1980-11-18 BR BR8007499A patent/BR8007499A/pt not_active IP Right Cessation
- 1980-12-05 US US06/213,758 patent/US4328031A/en not_active Expired - Lifetime
- 1980-12-15 AU AU65384/80A patent/AU541719B2/en not_active Ceased
- 1980-12-23 EP EP80401847A patent/EP0031776B1/de not_active Expired
- 1980-12-23 CA CA000367415A patent/CA1157658A/fr not_active Expired
- 1980-12-23 DE DE8080401847T patent/DE3063382D1/de not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1151053A (fr) * | 1956-05-29 | 1958-01-23 | Procédé de conversion de fonte en acier | |
| FR1344238A (fr) * | 1962-04-16 | 1963-11-29 | Cie Des Ateliers & Forges De L | Procédé et dispositifs d'élaboration de l'acier |
| FR1478478A (fr) * | 1966-03-03 | 1967-04-28 | Loire Atel Forges | Fond de convertisseur d'aciérie et procédé d'élaboration de l'acier mettant en oeuvre un tel fond |
| FR2217422A1 (de) * | 1973-02-12 | 1974-09-06 | Voest Ag | |
| FR2322202A1 (fr) * | 1975-08-29 | 1977-03-25 | Siderurgie Fse Inst Rech | Procede d'elaboration d'acier par soufflage d'oxygene |
Also Published As
| Publication number | Publication date |
|---|---|
| DD154026A5 (de) | 1982-02-17 |
| AU6538480A (en) | 1981-07-02 |
| US4328031A (en) | 1982-05-04 |
| AU541719B2 (en) | 1985-01-17 |
| CA1157658A (fr) | 1983-11-29 |
| BR8007499A (pt) | 1981-06-30 |
| DE3063382D1 (en) | 1983-07-07 |
| EP0031776A1 (de) | 1981-07-08 |
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