DE1008335B - Process for the production of a low-phosphorus, low-nitrogen and low-oxygen steel from pig iron with over 0.2% phosphorus - Google Patents

Process for the production of a low-phosphorus, low-nitrogen and low-oxygen steel from pig iron with over 0.2% phosphorus

Info

Publication number
DE1008335B
DE1008335B DEM17538A DEM0017538A DE1008335B DE 1008335 B DE1008335 B DE 1008335B DE M17538 A DEM17538 A DE M17538A DE M0017538 A DEM0017538 A DE M0017538A DE 1008335 B DE1008335 B DE 1008335B
Authority
DE
Germany
Prior art keywords
low
phosphorus
pig iron
nitrogen
over
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.)
Pending
Application number
DEM17538A
Other languages
German (de)
Inventor
Dr Friedr Alfred Springorum
Dr Karl Georg Speith
Dr Hans Vom Ende
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vodafone GmbH
Original Assignee
Mannesmann AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority to DEM17538A priority Critical patent/DE1008335B/en
Publication of DE1008335B publication Critical patent/DE1008335B/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/32—Blowing from above

Description

Verfahren zum Herstellen eines phosphor-, stickstoff- und sauerstoffarmen Stahles aus Roheisen mit über 0,2'/o Phosphor In der Patentanmeldung l#I 15023 VI/181) ist ein Verfahren zur Herstellung eines sauerstoffarmen Stahles aus Roheisen beschrieben. Nach. diesem Verfahren wird die Entfernung des Pho,-#I)hors aus (lern Roheisen durch Zugab2 einer ausreichenden Erzmengc zu Beginn des Verfahrens derart beschleunigt, daß beim Erreichen der im Stahl üblichen Phosphorgehalte noch ein höherer Kohlenstoffgehalt vorhanden ist. Dabei wird das Friscbmittel, für das vorzugsweise reineer Sa,ueistoff verwendet wird, von ob-en auf das Bad geblasen.Process for producing a low-phosphorus, low-nitrogen and low-oxygen steel from pig iron with more than 0.2% phosphorus. Patent application 1 # I 15023 VI / 181) describes a process for producing low-oxygen steel from pig iron. To. This process accelerates the removal of the Pho, - # 1) hors from pig iron by adding a sufficient amount of ore at the beginning of the process in such a way that a higher carbon content is present when the phosphorus content customary in steel is reached the preferably pure sa, ueistoff is used, blown from above onto the bath.

Es wurde nun gefunden, daß die Entphosphorung um so ehzr in Gang kommt und die Verschlackung des Phosphors um so schnellcr erfolgt, je, eher oine reaktionsfähige Schlacke im flüssigen Zustande- vorliegt. Durch das Aufblasen. von Sauc,rstoff auf die Schmelze tritt zwar an der betieffenden Stelle eine sehr hohe Temperatur a-uf. Diese genügt aber nicht, um den Kalk allein zum Schmelzen zu bringen. Zwar wird bei dc-rn genannten Verfahren durch Zugabe der benötigten Erzmenge schon eine gewisse Erniedrigung d---s Schlackenschmelzpunktes ei reicht. Diese. führt aber nur an der AufhIasstelle und in deren näherer Umgebung. zur Bildung einer flüssigen Schlacke. Bei einer weiteren Erniedrigung des Schlackenschmelzpunktes würden auch die von der Auftreffstelle entfernter liegenden Schlacke-nbildner zum Schmelzen kommen und dadurch die Entphosphorung des Roheisens noch mehr beschleunigen.It has now been found that the dephosphorization comes to so ehzr initiated and carried out the slagging of phosphorus so as schnellcr is present ever more Oine reactive slag in the liquid Zustande-. By inflating. From the sauce to the melt, a very high temperature occurs at the point where it is pressed. But this is not enough to melt the lime alone. In the case of the above-mentioned processes, by adding the required amount of ore, a certain lowering of the slag melting point is sufficient. These. but only leads to the hot spot and in its immediate vicinity. to form a liquid slag. If the slag melting point were to be lowered further, the slag formers located further away from the point of impact would also melt and thereby accelerate the dephosphorization of the pig iron even more.

Es wird daher vorgeschlagen, die Verflüssigung des Kalkes in an sich bekannter Weise durch ein oder mehrere stark basische Flußmittel neben dein Erz wirksam zu untei-stützen. Als solche Flußmittel kommen vorzugsweise die Oxyde und Karbonate der Ele-. mente der Alkaligruppe in Betracht. Es kann zweckmäßig sein, die Flußmittel vorher mit dem Kalk zu mischen und gegebenenfalls auch eine Zerkleinerung auf möglichst gleiche Korngröße vorzunehmen,It is therefore proposed to liquefy the lime in itself known way by one or more strongly basic fluxes in addition to your ore effective to support. The oxides and are preferably used as such fluxes Carbonates of the ele-. elements of the alkali group into consideration. It can be useful to mix the flux beforehand with the lime and, if necessary, also to crush it to be made to the same grain size as possible,

Claims (1)

PATENTANSPRUCH: Verfahren zum Herstellen eines phosphor-, stickstoff- und sauerstoffarmen Stahles aus Roheisen mit über 0,211/o Phosphor nach. der Pate#ntanmeldung M 15023 VI / 18 b, dadurch gekennzeichnet, daß neben bzw. mit dem Erz in an, sich bekannter We#ise stark wirkende basische Flußmittel zugegeben werden, vorzugsweise die Oxyde oder Ka,rbonate von Elementen der Alkaligr-uppe. In Betracht gezogene Druckschriften: Deutsche Patentschriften Nr. 361092. PATENT CLAIM: Process for producing a low-phosphorus, low-nitrogen and low-oxygen steel from pig iron with over 0.211 / o phosphorus. of the patent application M 15023 VI / 18 b, characterized in that strongly acting basic fluxes are added in addition to or with the ore in a manner known per se, preferably the oxides or carbonates of elements of the alkali group. Publications considered: German Patent Specifications No. 361092.
DEM17538A 1953-02-27 1953-02-27 Process for the production of a low-phosphorus, low-nitrogen and low-oxygen steel from pig iron with over 0.2% phosphorus Pending DE1008335B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEM17538A DE1008335B (en) 1953-02-27 1953-02-27 Process for the production of a low-phosphorus, low-nitrogen and low-oxygen steel from pig iron with over 0.2% phosphorus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM17538A DE1008335B (en) 1953-02-27 1953-02-27 Process for the production of a low-phosphorus, low-nitrogen and low-oxygen steel from pig iron with over 0.2% phosphorus

Publications (1)

Publication Number Publication Date
DE1008335B true DE1008335B (en) 1957-05-16

Family

ID=7297482

Family Applications (1)

Application Number Title Priority Date Filing Date
DEM17538A Pending DE1008335B (en) 1953-02-27 1953-02-27 Process for the production of a low-phosphorus, low-nitrogen and low-oxygen steel from pig iron with over 0.2% phosphorus

Country Status (1)

Country Link
DE (1) DE1008335B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0107299A1 (en) * 1982-09-01 1984-05-02 Ivor Gray Nixon Use of fluxes for refining metals, particularly steel melts

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE361092C (en) * 1921-04-09 1922-10-10 Richard Walter Desulphurizer for iron baths

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE361092C (en) * 1921-04-09 1922-10-10 Richard Walter Desulphurizer for iron baths

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0107299A1 (en) * 1982-09-01 1984-05-02 Ivor Gray Nixon Use of fluxes for refining metals, particularly steel melts

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