EP0316921B1 - Lead-containing additives for steel melts - Google Patents
Lead-containing additives for steel melts Download PDFInfo
- Publication number
- EP0316921B1 EP0316921B1 EP88119149A EP88119149A EP0316921B1 EP 0316921 B1 EP0316921 B1 EP 0316921B1 EP 88119149 A EP88119149 A EP 88119149A EP 88119149 A EP88119149 A EP 88119149A EP 0316921 B1 EP0316921 B1 EP 0316921B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lead
- steel
- additive
- lime
- filled wire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous 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
- C21C7/0006—Adding metallic additives
- C21C2007/0012—Lead
Definitions
- the present invention relates to additives containing lead for the treatment of molten steel in the form of filled wires consisting of a metallic jacket and finely divided filler.
- lead is used as an additive for steel treatment in order to improve the machining properties, with contents of typically 0.05 to 0.5% in the steel being set.
- the lead additive extends the service life of the tools, optimizes chip formation because the chips break shorter and improves the surface quality of the workpiece.
- lead practically does not dissolve in iron, there are considerable problems in practice in distributing the lead evenly in the molten steel.
- the lead must be evenly distributed in the steel melt in the form of small droplets, this fine distribution also having to be retained until it solidifies. Lead droplets that are too large separate out due to their high specific weight and thus lead to an insufficient distribution of lead.
- the lead is introduced with severe burn-off losses, which not only causes a corresponding environmental impact, but also an insufficient distribution of the lead in the steel melt.
- Injection techniques such as cored wire technology can reduce burn-up losses, but first attempts with lead-filled hollow wires, as known, for example, from Revue de Métallurgie-CIT, 81 (1984) p.641-649, have shown that when these wires are wound into the molten steel, there was insufficient lead distribution in the steel. Relatively high lead concentrations at the start of casting and too low lead contents at the end of casting in the batches were regularly analyzed.
- the present invention was therefore based on the object of developing a lead-containing additive for steel melts which does not have the disadvantages of the prior art mentioned, but rather enables uniform distribution and good application of the lead in the steel and, at the same time, safe handling and largely environmentally harmful emissions avoids.
- the lead can be introduced into the steel in a safe, targeted and uniform manner.
- the additive according to the present invention is in the form of a filled wire, consisting of a metallic sheath and a finely divided filler material which is sheathed by the sheath.
- the jacket material should be selected so that it dissolves in the steel melt relatively quickly with the release of the treatment agent, without this jacket material or its residues introducing undesirable components into the steel melt. Unalloyed steel casings have proven to be the best.
- the thickness of the jacket is usually 0.1 to 1 mm, preferably 0.2 to 0.6 mm.
- the diameter of the entire cored wire can also be varied within wide limits, but a diameter range of 5 to 20 mm, preferably 9 to 13 mm, has proven to be particularly advantageous.
- the filler material of the wire consists of two finely divided components, the first component consisting of metallic lead and / or alloys containing lead.
- lead-containing alloys are to be understood as those alloys which predominantly consist of lead and which also contain other alloy components which do not adversely affect the material properties of the steel to be treated.
- the lead or lead alloys should be in the most finely divided form possible, in order to pass into the smallest droplets during the treatment.
- the particle size should expediently not be greater than 1 mm and preferably less than 0.8 mm.
- the lead or lead alloys are preferably used in the form of small granules or beads.
- the amount of lead per cored wire length unit depends on the diameter of the cored wire and varies between 100 and 1000 g per meter of cored wire.
- the filler material of the wire consists of a calcareous material which spontaneously releases CO2 at the temperature of the molten steel (approx. 1550 to 1650 ° C) and also in finely divided form, i.e. with a particle size ⁇ 1 mm.
- limestone or unburned dolomite can be used as a calcareous material. Finely divided limestone or dolomite occurs as a by-product in the large-scale production of burnt lime or dolomite and is therefore used in a meaningful way.
- diamide lime which is produced in the industrial production of dicyandiamide from calcium cyanamide and essentially consists of particularly finely divided calcium carbonate (particle size approx. 90% ⁇ 60 ⁇ ), has proven to be particularly advantageous. Precisely because of its fineness, it is particularly suitable for the purpose according to the invention.
- the amount of CO2-releasing, calcareous material used depends on the size of the batches to be treated and varies between 3 and 30% by weight based on the weight of the lead or lead alloy (s) used.
- the production of the cored wire according to the invention is unproblematic and is carried out using customary methods and methods.
- the finely divided filler material is mixed intensively, then filled into the wires, which are closed by folding or HF welding and then wound up on coils.
- the steel treatment with the additive according to the invention can be carried out safely and without problems.
- the wire is added to the ladles before casting. According to the desired lead analysis in steel, 0.1 to 10 kg of cored wire is used per ton of molten steel to be treated, a winding speed of 50 to 180 m / minute, preferably 100 to 120 m / minute, having proven successful.
Abstract
Description
Die vorliegende Erfindung betrifft bleihaltige Zusatzmittel zur Behandlung von Stahlschmelzen in Form von gefüllten Drähten bestehend aus einem metallischen Mantel und feinteiligem Füllmaterial.The present invention relates to additives containing lead for the treatment of molten steel in the form of filled wires consisting of a metallic jacket and finely divided filler.
Blei wird bekanntermaßen als Zusatzmittel zur Stahlbehandlung eingesetzt, um die Zerspannungseigenschaften zu verbessern, wobei üblicherweise Gehalte von 0,05 bis 0,5 % Blei im Stahl eingestellt werden. Der Bleizusatz verlängert die Standzeit der Werkzeuge, optimiert die Spanausbildung, weil die Späne kürzer brechen und verbessert die Oberflächenbeschaffenheit des Werkstückes.As is known, lead is used as an additive for steel treatment in order to improve the machining properties, with contents of typically 0.05 to 0.5% in the steel being set. The lead additive extends the service life of the tools, optimizes chip formation because the chips break shorter and improves the surface quality of the workpiece.
Weil sich Blei im Eisen praktisch nicht löst, ergeben sich in der Praxis erhebliche Probleme, das Blei gleichmäßig in der Stahlschmelze zu verteilen. Das Blei muß zu diesem Zweck suspensionsartig in Form von kleinen Tröpfchen gleichmäßig in der Stahlschmelze verteilt sein, wobei diese Feinverteilung auch bis zur Erstarrung erhalten bleiben muß. Zu große Bleitröpfchen scheiden sich aufgrund ihres hohen spezifischen Gewichts ab und führen so zu einer unzureichenden Bleiverteilung.Because lead practically does not dissolve in iron, there are considerable problems in practice in distributing the lead evenly in the molten steel. For this purpose, the lead must be evenly distributed in the steel melt in the form of small droplets, this fine distribution also having to be retained until it solidifies. Lead droplets that are too large separate out due to their high specific weight and thus lead to an insufficient distribution of lead.
In der Praxis war es bisher üblich, die Zugabe des Bleis beim Blockguß mit Hilfe von Gießtrichtern vorzunehmen. Die Turbulenz in der Gießkanälen sorgt hierbei für eine gleichmäßige Bleiverteilung. Nachteilig ist hierbei die starke Belastung der Gießmannschaft durch die Bleidämpfe während der gesamten Gießzeit.In practice it has been customary up to now to add the lead during the block casting with the help of pouring funnels. The turbulence in the pouring channels ensures an even distribution of lead. The disadvantage here is the heavy loading of the casting team by the lead vapors during the entire casting time.
Es ist deshalb auch schon versucht worden, der Stahlschmelze das Blei in Form von Granalien während des Abstichs zuzusetzen.For this reason, attempts have already been made to add the lead in the form of granules to the molten steel during the tapping.
Das Blei wird aber hierbei unter starken Abbrandverlusten eingebracht, was nicht nur eine entsprechende Umweltbelastung, sondern auch eine ungenügende Verteilung des Bleis in der Stahlschmelze verursacht. Injektionstechniken wie die Fülldrahttechnik können zwar die Abbrandverluste vermindern, doch haben erste Versuche mit bleigefüllten Hohldrähten, wie zum Beispiel aus Revue de Métallurgie-CIT, 81(1984) S.641-649 bekannt, gezeigt, daß beim Einspulen dieser Drähte in die Stahlschmelze eine unzureichende Bleiverteilung im Stahl zu verzeichnen war. Regelmässig wurden relativ hohe Bleikonzentrationen bei Gießbeginn und zu niedrige Bleigehalte am Gießende bei den Chargen analysiert.However, the lead is introduced with severe burn-off losses, which not only causes a corresponding environmental impact, but also an insufficient distribution of the lead in the steel melt. Injection techniques such as cored wire technology can reduce burn-up losses, but first attempts with lead-filled hollow wires, as known, for example, from Revue de Métallurgie-CIT, 81 (1984) p.641-649, have shown that when these wires are wound into the molten steel, there was insufficient lead distribution in the steel. Relatively high lead concentrations at the start of casting and too low lead contents at the end of casting in the batches were regularly analyzed.
Der vorliegenden Erfindung lag daher die Aufgabe zugrunde, ein bleihaltiges Zusatzmittel für Stahlschmelzen zu entwickeln, welches die genannten Nachteile des Standes der Technik nicht aufweist, sondern eine gleichmäßige Verteilung und ein gutes Ausbringen des Bleis im Stahl sowie gleichzeitig eine sichere Handhabung ermöglicht und umweltschädliche Emissionen weitgehend vermeidet.The present invention was therefore based on the object of developing a lead-containing additive for steel melts which does not have the disadvantages of the prior art mentioned, but rather enables uniform distribution and good application of the lead in the steel and, at the same time, safe handling and largely environmentally harmful emissions avoids.
Diese Aufgabe wurde erfindungsgemäß dadurch gelöst, daß das feinteilige Füllmaterial aus
- a) metallischem Blei und/oder Bleilegierungen sowie
- b) einem bei der Temperatur der Stahlschmelze CO₂-abspaltendes kalkhaltigen Material besteht.
- a) metallic lead and / or lead alloys as well
- b) there is a CO₂-releasing calcareous material at the temperature of the molten steel.
Es hat sich nämlich überraschenderweise gezeigt, daß mit Hilfe dieses Zusatzmittels ein sicheres und gezieltes sowie gleichmäßiges Einbringen des Bleis in den Stahl möglich ist.Surprisingly, it has been shown that with the aid of this additive, the lead can be introduced into the steel in a safe, targeted and uniform manner.
Das Zusatzmittel entsprechend der vorliegenden Erfindung liegt in Form eines gefüllten Drahtes vor, bestehend aus einem metallischen Mantel und einem feinteiligen Füllmaterial, welches von dem Mantel umhüllt wird. Das Mantelmaterial sollte so ausgewählt werden, daß es sich in der Stahlschmelze relativ schnell unter Freigabe des Behandlungsmittels auflöst, ohne daß dieses Mantelmaterial bzw. dessen Rückstände unerwünschte Bestandteile in die Stahlschmelze einbringen. Am besten haben sich unlegierte Stahlumhüllungen bewährt. Die Dicke des Mantels beträgt in der Regel 0,1 bis 1 mm, vorzugsweise 0,2 bis 0,6 mm.The additive according to the present invention is in the form of a filled wire, consisting of a metallic sheath and a finely divided filler material which is sheathed by the sheath. The jacket material should be selected so that it dissolves in the steel melt relatively quickly with the release of the treatment agent, without this jacket material or its residues introducing undesirable components into the steel melt. Unalloyed steel casings have proven to be the best. The thickness of the jacket is usually 0.1 to 1 mm, preferably 0.2 to 0.6 mm.
Der Durchmesser des gesamten Fülldrahtes kann ebenfalls in weiten Grenzen variiert werden, doch hat sich ein Durchmesserbereich von 5 bis 20 mm, vorzugsweise 9 bis 13 mm, als besonders vorteilhaft erwiesen. Das Füllmaterial des Drahtes besteht aus zwei feinteiligen Komponenten, wobei die erste Komponente aus metallischem Blei und/oder bleihaltigen Legierungen besteht. Unter bleihaltigen Legierungen sind im Rahmen der vorliegenden Erfindung solche Legierungen zu verstehen, die überwiegend aus Blei bestehen und noch andere Legierungsbestandteile enthalten, welche die Werkstoffeigenschaften des zu behandelnden Stahls nicht negativ beeinflussen. Das Blei oder die Bleilegierungen sollten in möglichst feinverteilter Form vorliegen, um bei der Behandlung in kleinste Tröpfchen überzugehen. Hierzu sollte die Teilchengröße zweckmäßigerweise nicht größer als 1 mm sein und vorzugsweise kleiner als 0,8 mm. Das Blei oder die Bleilegierungen werden bevorzugt in Form von kleinen Granulaten oder Kügelchen eingesetzt. Die Menge des Bleis pro Fülldrahtlängeneinheit richtet sich nach dem Durchmesser des Fülldrahtes und variiert zwischen 100 und 1000 g pro Meter Fülldraht.The diameter of the entire cored wire can also be varied within wide limits, but a diameter range of 5 to 20 mm, preferably 9 to 13 mm, has proven to be particularly advantageous. The filler material of the wire consists of two finely divided components, the first component consisting of metallic lead and / or alloys containing lead. In the context of the present invention, lead-containing alloys are to be understood as those alloys which predominantly consist of lead and which also contain other alloy components which do not adversely affect the material properties of the steel to be treated. The lead or lead alloys should be in the most finely divided form possible, in order to pass into the smallest droplets during the treatment. For this purpose, the particle size should expediently not be greater than 1 mm and preferably less than 0.8 mm. The lead or lead alloys are preferably used in the form of small granules or beads. The amount of lead per cored wire length unit depends on the diameter of the cored wire and varies between 100 and 1000 g per meter of cored wire.
Als zweite wesentliche Komponente besteht das Füllmaterial des Drahtes aus einem kalkhaltigen Material, welches bei der Temperatur der Stahlschmelze (ca. 1550 bis 1650°C) spontan CO₂ abspaltet und ebenfalls in feinverteilter Form, d.h. mit einer Teilchengröße < 1 mm vorliegt.As a second essential component, the filler material of the wire consists of a calcareous material which spontaneously releases CO₂ at the temperature of the molten steel (approx. 1550 to 1650 ° C) and also in finely divided form, i.e. with a particle size <1 mm.
Als kalkhaltiges Material kommt beispielsweise Kalkstein oder ungebrannter Dolomit in Frage. Feinteiliger Kalkstein oder Dolomit fällt bei der großtechnischen Produktion von gebranntem Kalk oder Dolomit als Nebenprodukt an und wird somit einer sinnvollen Nutzung zugeführt.As a calcareous material, for example, limestone or unburned dolomite can be used. Finely divided limestone or dolomite occurs as a by-product in the large-scale production of burnt lime or dolomite and is therefore used in a meaningful way.
Als besonders vorteilhaft hat sich der Einsatz von Diamidkalk erwiesen, der bei der großtechnischen Herstellung von Dicyandiamid aus Kalkstickstoff anfällt und im wesentlichen aus besonders feinteiligem Calciumcarbonat (Teilchengröße ca. 90 % < 60 µ) besteht. Gerade wegen seiner Feinteiligkeit ist er für den erfindungsgemäßen Zweck besonders geeignet.The use of diamide lime, which is produced in the industrial production of dicyandiamide from calcium cyanamide and essentially consists of particularly finely divided calcium carbonate (particle size approx. 90% <60 μ), has proven to be particularly advantageous. Precisely because of its fineness, it is particularly suitable for the purpose according to the invention.
Durch diese kalkhaltigen CO₂-abspaltenden Materialien wird bei exakter Dosierung in der Stahlschmelze eine Turbulenz erzeugt, die im Nahbereich des Fülldrahtes so intensiv ist, daß feinste Bleitröpfchen in den Stahl emulgiert werden. Die aufsteigenden Gasblasen versetzen gleichzeitig die Schmelze in eine Umlaufströmung, die für eine homogene Verteilung dieser Emulsion in allen Pfannenbereichen sorgt.Due to these calcareous CO₂-releasing materials, turbulence is generated with exact dosing in the steel melt, which is so intense in the vicinity of the cored wire that the finest lead droplets are emulsified into the steel. The rising gas bubbles simultaneously set the melt in a circulation flow, which ensures a homogeneous distribution of this emulsion in all pan areas.
Weil sich weder das freiwerdende CO₂, noch die zurückbleibenden Oxide im flüssigen Stahl lösen, wird die geforderte Stahlanalyse nicht beeinflußt.Because neither the released CO₂ nor the remaining oxides dissolve in the liquid steel, the required steel analysis is not affected.
Die Menge des eingesetzten CO₂-abspaltenden, kalkhaltigen Materials richtet sich nach der Größe der zu behandelnden Chargen und variiert zwischen 3 und 30 Gew.-% bezogen auf das Gewicht des eingesetzten Bleis bzw. der eingesetzten Bleilegierung(en).The amount of CO₂-releasing, calcareous material used depends on the size of the batches to be treated and varies between 3 and 30% by weight based on the weight of the lead or lead alloy (s) used.
Die Herstellung des erfindungsgemäßen Fülldrahtes ist unproblematisch und erfolgt nach üblichen Verfahren und Methoden. Das feinteilige Füllmaterial wird intensiv vermischt, anschließend in die Drähte eingefüllt, welche durch Falzung oder HF-Schweißung geschlossen und dann auf Coils aufgewickelt werden.The production of the cored wire according to the invention is unproblematic and is carried out using customary methods and methods. The finely divided filler material is mixed intensively, then filled into the wires, which are closed by folding or HF welding and then wound up on coils.
Die Stahlbehandlung mit dem erfindungsgemäßen Zusatzmittel ist sicher und problemlos durchzuführen. Die Zugabe des Drahtes erfolgt in den Gießpfannen vor dem Gießen. Entsprechend der gewünschten Bleianalyse im Stahl wird 0,1 bis 10 kg Fülldraht pro Tonne zu behandelnder Stahlschmelze eingesetzt, wobei sich eine Einspulgeschwindigkeit von 50 bis 180 m/Minute, vorzugsweise 100 bis 120 m/Minute bewährt hat.The steel treatment with the additive according to the invention can be carried out safely and without problems. The wire is added to the ladles before casting. According to the desired lead analysis in steel, 0.1 to 10 kg of cored wire is used per ton of molten steel to be treated, a winding speed of 50 to 180 m / minute, preferably 100 to 120 m / minute, having proven successful.
Auf diese Weise wird erreicht, daß das Zusatzmittel sicher und in kontrollierter Weise in die Stahlschmelze eingebracht und daß die für die gleichmäßige Verteilung der feinteiligen Bleitröpfchen optimale Turbulenz erzeugt wird. Diese gleichmäßige Tröpfchenverteilung ist wiederum die Ursache für das gute Ausbringen des Bleis im Rahmen der vorliegenden Erfindung, welches bei bis zu 70 % liegt.In this way it is achieved that the additive is introduced into the molten steel safely and in a controlled manner and that the turbulence which is optimal for the uniform distribution of the finely divided lead droplets is generated. This uniform droplet distribution is in turn the cause for the good application of the lead in the context of the present invention, which is up to 70%.
Die nachfolgenden Beispiele sollen die Erfindung näher erläutern.The following examples are intended to explain the invention in more detail.
In eine 78 t-Stahlschmelze (ähnlich CK 22) wurden 360 m eines 9 mm Fülldrahtes mit einer Einspulgeschwindigkeit von 120 m/Minute eingespult, was einer Menge von 144 kg an metallischem Blei (Teilchengröße 0,6 mm) entsprach. Das Füllmaterial bestand aus 8,64 kg Diamidkalk (= 6 Gew.-% bezogen auf das Gewicht des Bleis) mit einer Teilchengröße von 96 % < 0,063 mm. Das Füllmaterial war mit einem Eisenblech (Wandstärke 0,4 mm) umhüllt. Für die gesamte Charge wurden Bleiwerte von 0,12 bis 0,13 % analysiert. Das mittlere Ausbringen lag somit bei 68 %.360 m of a 9 mm cored wire were wound into a 78 t molten steel (similar to CK 22) at a winding speed of 120 m / minute, which corresponded to a quantity of 144 kg of metallic lead (particle size 0.6 mm). The filling material consisted of 8.64 kg diamide lime (= 6% by weight based on the weight of the lead) with a particle size of 96% <0.063 mm. The filling material was covered with an iron sheet (wall thickness 0.4 mm). Lead values of 0.12 to 0.13% were analyzed for the entire batch. The mean yield was 68%.
110 t einer Stahlschmelze der Qualität 10 S Pb 20 wurden 350 kg Blei in Form eines Fülldrahtes zugesetzt, wobei der Draht mit einem Durchmesser von 13 mm 880 g Blei/m und 8 Gew.-% Kalkstein (Teilchengröße < 100 µm) bezogen auf das Gewicht des Bleis enthielt. Die Einspulgeschwindigkeit lag bei 120 m/Minute. Die Fertigproben dieser Charge zeigten Bleiwerte von 0,22 bis 0,24 %. Das mittlere Bleiausbringen lag somit bei ca. 66 %.110 t of a steel melt of the quality 10 S Pb 20 were added 350 kg of lead in the form of a cored wire, the wire with a diameter of 13 mm 880 g lead / m and 8 wt .-% limestone (particle size <100 microns) based on the Weight of the lead contained. The winding speed was 120 m / minute. The finished samples of this batch showed lead values of 0.22 to 0.24%. The mean lead output was therefore around 66%.
Claims (13)
- Lead-containing additive for steel melts in the form of a filled wire consisting of a metallic mantle and finely-divided filling material, characterised in that the finely-divided filling material consists ofa) metallic lead and/or lead alloy(s), as well asb) a lime-containing material splitting off CO₂ at the temperature of the steel melt.
- Additive according to claim 1, characterised in that the metallic mantle consists of non-alloyed steel.
- Additive according to claim 1 or 2, characterised in that the metallic mantle has a thickness of 0.1 to 1 mm, preferably of 0.2 to 0.6 mm.
- Additive according to one of claims 1 to 3, characterised in that the filled wire has a diameter of 5 to 20 mm, preferably of 9 to 13 mm.
- Additive according to one of claims 1 to 4, characterised in that the filling material has a particle size of not greater than 1 mm.
- Additive according to one of claims 1 to 5, characterised in that the filled wire contains 100 to 1000 g of lead per metre.
- Additive according to one of claims 1 to 6, characterised in that the lime-containing material splitting off CO₂ consists of limestone and/or uncalcined dolomite.
- Additive according to one of claims 1 to 6, characterised in that the lime-containing material splitting off CO₂ consists of diamide lime.
- Additive according to one of claims 1 to 8, characterised in that the lime-containing material is used in an amount of 3 to 30 wt.%, referred to the weight of the lead used and/or of the lead alloy(s) used.
- Process for the treatment of steel melts with a lead-containing additive, characterised in that, as additive, one introduces a filled wire according to one of claims 1 to 9 into the melt.
- Process according to claim 10, characterised in that one introduces 0.1 to 10 kg of filled wire per tonne of steel melt to be treated.
- Process according to claim 10 or 11, characterised in that one spools the filled wire into the steel melt at a rate of 50 to 180 m/minute, especially of 100 to 120 m/minute.
- Use of a filled wire according to one of claims 1 to 9 as a lead-containing additive for steel melts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT88119149T ATE89325T1 (en) | 1987-11-19 | 1988-11-17 | ADDITIVE CONTAINING LEAD FOR MELTED STEEL. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19873739154 DE3739154A1 (en) | 1987-11-19 | 1987-11-19 | LEADING ADDITIVE FOR STEEL MELTING |
| DE3739154 | 1987-11-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0316921A1 EP0316921A1 (en) | 1989-05-24 |
| EP0316921B1 true EP0316921B1 (en) | 1993-05-12 |
Family
ID=6340760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88119149A Expired - Lifetime EP0316921B1 (en) | 1987-11-19 | 1988-11-17 | Lead-containing additives for steel melts |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4892580A (en) |
| EP (1) | EP0316921B1 (en) |
| JP (1) | JP2760817B2 (en) |
| AT (1) | ATE89325T1 (en) |
| BR (1) | BR8806056A (en) |
| DE (2) | DE3739154A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10236354B4 (en) * | 2002-08-08 | 2005-06-09 | Goldschmidt Ag | Process for the treatment of molten steel |
| EP1713941A1 (en) * | 2004-02-11 | 2006-10-25 | Tata Steel Limited | A cored wire injection process in steel melts |
| US20060205974A1 (en) * | 2005-03-08 | 2006-09-14 | Lavoie Gino G | Processes for producing aromatic dicarboxylic acids |
| RU2529132C2 (en) * | 2007-05-17 | 2014-09-27 | Общество С Ограниченной Ответственностью "Аффиваль Восток" | Provision for improved recovery of alloy in molten steel bath with usage of wire with deoxidiser-containing core |
| WO2008144627A1 (en) * | 2007-05-17 | 2008-11-27 | Affival, Inc. | Enhanced alloy recovery in molten steel baths utilizing cored wires doped with dispersants |
| FR2917096B1 (en) * | 2007-06-05 | 2011-03-11 | Affival | NOVEL ADDITIVE COMPRISING LEAD AND / OR LEAD ALLOY FOR TREATING LIQUID STEEL BATHS. |
| JP5326243B2 (en) * | 2007-09-05 | 2013-10-30 | 新日鐵住金株式会社 | How to add lead to molten steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2259342A (en) * | 1940-04-17 | 1941-10-14 | Inland Steel Co | Method of adding lead to steel |
| DE829802C (en) * | 1950-05-31 | 1952-01-28 | Dr Aloys Wuestefeld | Process for the desulfurization and deoxidation of iron and metal melts as well as for the production of spherulitic cast iron |
| US3313620A (en) * | 1963-02-18 | 1967-04-11 | E I Te R S P A Elettochimica I | Steel with lead and rare earth metals |
| JPS4824607B1 (en) * | 1969-10-04 | 1973-07-23 | ||
| FR2085306A1 (en) * | 1970-04-08 | 1971-12-24 | Loire Atel Forges | Auxiliary appts for ingot moulds - enabling introduction of solid additives |
| AT317274B (en) * | 1970-12-28 | 1974-08-26 | Steirische Gussstahlwerke | Process for the production of steels containing lead |
| FR2476542B1 (en) * | 1980-02-26 | 1983-03-11 | Vallourec | |
| US4389249A (en) * | 1982-04-22 | 1983-06-21 | Inland Steel Company | Method for adding ingredient to steel as shot |
| JPS5992151A (en) * | 1982-11-18 | 1984-05-28 | Sumitomo Metal Ind Ltd | Production of free-cutting lead steel by continuous casting method |
| JPS59157215A (en) * | 1983-02-26 | 1984-09-06 | Nippon Steel Corp | Manufacture of molten steel containing lead by utilizing calcium carbonate |
| FR2594850A1 (en) * | 1986-02-24 | 1987-08-28 | Vallourec | TUBULAR ENCLOSED COMPOSITE PRODUCT COMPRISING COMPACT MATERIAL FOR THE TREATMENT OF LIQUID METALS AND PROCESS FOR PRODUCING THE SAME |
-
1987
- 1987-11-19 DE DE19873739154 patent/DE3739154A1/en not_active Withdrawn
-
1988
- 1988-11-14 US US07/270,535 patent/US4892580A/en not_active Expired - Fee Related
- 1988-11-17 AT AT88119149T patent/ATE89325T1/en not_active IP Right Cessation
- 1988-11-17 DE DE8888119149T patent/DE3880972D1/en not_active Expired - Lifetime
- 1988-11-17 EP EP88119149A patent/EP0316921B1/en not_active Expired - Lifetime
- 1988-11-18 BR BR888806056A patent/BR8806056A/en unknown
- 1988-11-18 JP JP63290337A patent/JP2760817B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| Cahiers d'Informations Techniques de la Revue de Métallurgie, 81 (1984), no. 8/9, Paris, France, "Utilisation du fil fourré dans la métallurgie en poche", S. 641-649 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE89325T1 (en) | 1993-05-15 |
| DE3880972D1 (en) | 1993-06-17 |
| DE3739154A1 (en) | 1989-06-01 |
| US4892580A (en) | 1990-01-09 |
| EP0316921A1 (en) | 1989-05-24 |
| JPH01162716A (en) | 1989-06-27 |
| BR8806056A (en) | 1989-08-08 |
| JP2760817B2 (en) | 1998-06-04 |
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