DE878358C - Process for making a steel with a low nitrogen content in the Thomas pear - Google Patents
Process for making a steel with a low nitrogen content in the Thomas pearInfo
- Publication number
- DE878358C DE878358C DEV1459D DEV0001459D DE878358C DE 878358 C DE878358 C DE 878358C DE V1459 D DEV1459 D DE V1459D DE V0001459 D DEV0001459 D DE V0001459D DE 878358 C DE878358 C DE 878358C
- Authority
- DE
- Germany
- Prior art keywords
- pig iron
- steel
- pear
- thomas
- melt
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
Verfahren zur Herstellung eines Stahles mit niedrigem Stickstoffgehalt in der Thomasbirne In neuerer Zeit haben in der Thomasbirne hergestellte Stähle mit weniger als o,i2% Stickstoff, insbesondere wenn gleichzeitig der Phosphorgehalt unter 0,05010 liegt, erhöhte Bedeutung erlangt. Derartige Stähle weisen z. B. nach Kaltverformung geringe Härtesteigerung auf und sind weiterhin zur Verwendung von Teilen, die bei ihrer Herstellung eine Erhitzung mit anschließender beschleunigter Abkühlung erfahren, besonders geeignet.Method for producing a steel with a low nitrogen content in the Thomas pear In recent times, steels with less than 0.12% nitrogen, especially when the phosphorus content is below 0.05010 , have become increasingly important. Such steels have z. B. after cold forming on a slight increase in hardness and are also particularly suitable for the use of parts that are heated during their manufacture with subsequent accelerated cooling.
Es wurde nun gefunden, daß eine wesentliche Erniedrigung des Stickstoffgehaltes im Fertigstahl dann erzielt werden kann, wenn man in der Thomasbirne zunächst nur einen Teil des Roheisens vorfrischt, dann erst den restlichen Roheisenanteil zugibt und die Gesamtschmelze schließlich in der Birne fertigbläst. Die nach dem Fertigfrischen des Hauptteils der Schmelze zugegebene Roheisenmenge muß wesentlich größer sein, als es zum Desoxydieren erforderlich wäre, da nur dann die gewünschte Wirkung in genügendem Maße eintritt. Beispielsweise kann man mit Roheisenzugaben von io bis 2o0/a des Gesamtgewichtes arbeiten. Um gleichzeitig einen besonders niedrigen Phosphorgehalt zu erzielen, ist es zweckmäßig, die beim Frischen des Hauptteils der Schmelze gebildete Schlacke abzukippen und nach der Roheisenzugabe die Gesamtschmelze mit einer zweiten stark basischen Schlacke fertigzublasen. Diese zweite Schlacke kann dann beim Verblasen der nächsten Schmelze zur Bildung der Hauptschlacke mitbenutzt werden.It has now been found that there is a substantial reduction in the nitrogen content in finished steel can then be achieved if one in the Thomas pear initially only Part of the pig iron is pre-freshened, only then is the remaining pig iron added and the total melt finally blows up in the pear. The one after the finish freshening most of the pig iron added to the melt must be significantly greater, than it would be necessary for deoxidizing, since only then the desired effect in occurs sufficiently. For example, adding pig iron from io to 2o0 / a of the total weight work. To be special at the same time To achieve a low phosphorus content, it is advisable to do this when freshening the main part dump the slag formed in the melt and, after adding the pig iron, the entire melt to finish blowing with a second strongly basic slag. This second slag can then be used when the next melt is blown to form the main slag will.
Bei dem Verfahren gemäß der Erfindung können auch die sonstigen bekannten bzw. bereits vorgeschlagenen Maßnahmen zur Erzielung niedriger Stickstoffgehalte im Thomasstahl einzeln oder zu mehreren mitangewendet werden. Hierzu sind z. B. folgende zu rechnen: Kühlen mit Schrott oder Erz während der Entkohlung bzw. beim Beginn der Phosphorverbrennung, niedriger Mangangehalt des Roheisens, vorzugsweise unter 0,50°/o-, verhältnismäßig geringe Badhöhe. Schließlich ist es möglich, das Roheisen ganz oder teilweise in fester Form zuzugeben, um eine niedrigere Badtemperatur während der zweiten Blasperiode, d. h. nach der Roheisenzugabe, zu erhalten.In the method according to the invention, the other known or already proposed measures to achieve low nitrogen contents can be used individually or in groups in the Thomasstahl. For this purpose are z. B. The following can be expected: Cooling with scrap or ore during decarburization or during Start of phosphorus combustion, low manganese content of pig iron, preferably below 0.50%, relatively low bath height. After all, it is possible that Add pig iron in whole or in part in solid form in order to lower the bath temperature during the second blowing period, i.e. H. after the addition of pig iron.
Neben den erwähnten Verwendungszwecken ist der nach dem Verfahren der Erfindung erhaltene Stahl zur Herstellung von Duplexstählen, die zunächst im Thomasofen gefrischt und dann im Siemens-Martin-Ofen oder Elektroofen fertigbehandelt werden, besonders geeignet, da sein niedrigerer Stickstoffgehalt sich auch auf den Stickstoffgehalt des Duplexstahles günstig auswirkt.In addition to the purposes mentioned, that is according to the procedure Steel obtained according to the invention for the production of duplex steels, which are initially in the Thomas oven refurbished and then finished in the Siemens-Martin oven or electric oven be particularly suitable as its lower nitrogen content also affects the Nitrogen content of the duplex steel has a beneficial effect.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEV1459D DE878358C (en) | 1941-12-28 | 1941-12-28 | Process for making a steel with a low nitrogen content in the Thomas pear |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEV1459D DE878358C (en) | 1941-12-28 | 1941-12-28 | Process for making a steel with a low nitrogen content in the Thomas pear |
Publications (1)
Publication Number | Publication Date |
---|---|
DE878358C true DE878358C (en) | 1953-06-01 |
Family
ID=7569647
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEV1459D Expired DE878358C (en) | 1941-12-28 | 1941-12-28 | Process for making a steel with a low nitrogen content in the Thomas pear |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE878358C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1179964B (en) * | 1957-12-31 | 1964-10-22 | Phoenix Rheinrohr Ag | Method for producing steel in the bottom-blowing converter by refining a pig iron containing 0.6 to 2 percent phosphorus |
DE1183925B (en) * | 1954-02-03 | 1964-12-23 | Mannesmann Ag | Process for increasing the profitability of refining pig iron with more than 0.2% phosphorus by blowing oxygen-containing gases, in particular technically pure oxygen |
-
1941
- 1941-12-28 DE DEV1459D patent/DE878358C/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1183925B (en) * | 1954-02-03 | 1964-12-23 | Mannesmann Ag | Process for increasing the profitability of refining pig iron with more than 0.2% phosphorus by blowing oxygen-containing gases, in particular technically pure oxygen |
DE1179964B (en) * | 1957-12-31 | 1964-10-22 | Phoenix Rheinrohr Ag | Method for producing steel in the bottom-blowing converter by refining a pig iron containing 0.6 to 2 percent phosphorus |
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