DE1909780A1 - Quenching method for pig iron contng - phosphorous - Google Patents
Quenching method for pig iron contng - phosphorousInfo
- Publication number
- DE1909780A1 DE1909780A1 DE19691909780 DE1909780A DE1909780A1 DE 1909780 A1 DE1909780 A1 DE 1909780A1 DE 19691909780 DE19691909780 DE 19691909780 DE 1909780 A DE1909780 A DE 1909780A DE 1909780 A1 DE1909780 A1 DE 1909780A1
- Authority
- DE
- Germany
- Prior art keywords
- oxygen
- fresh
- content
- melt
- contng
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910000805 Pig iron Inorganic materials 0.000 title 1
- 238000010791 quenching Methods 0.000 title 1
- 230000000171 quenching effect Effects 0.000 title 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000001301 oxygen Substances 0.000 claims abstract description 19
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 19
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000001257 hydrogen Substances 0.000 claims abstract description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims abstract description 4
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000002893 slag Substances 0.000 claims description 7
- 239000000155 melt Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 239000011574 phosphorus Substances 0.000 claims description 4
- 239000000161 steel melt Substances 0.000 claims 1
- 238000007664 blowing Methods 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 abstract 2
- 239000000725 suspension Substances 0.000 abstract 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract 1
- 229930195733 hydrocarbon Natural products 0.000 abstract 1
- 150000002430 hydrocarbons Chemical class 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 238000009489 vacuum treatment Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 229910002065 alloy metal Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000009628 steelmaking Methods 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
-
- 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
- C21C5/34—Blowing through the bath
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
"Verfahren zum Senken der Sauerstoff- und Wasserstoffgehalte in kohlenstoffarmen Stählen" Bei Stahlherstellungsverfahren, bei denen am Ende des Frischvorganges die Kohlenstoffgehalte im Metall bestimmte Grenzwerte unterschreiten, kommt es zu einer metallurgisch bedingten starken Sauerstoffaufnahme. Auch der Wasserstoffgehalt im Metall kann stark ansteigen. Erhöhte Sauerstoff- und Wasserstoffgehalte sind aber bei vielen Stahlqualitäten unerwünscht, da sie die technologischen Eigenschaften des fertigen Stahles verschlechtern. Bel der Stahlherstellung erschweren weiterhin hohe Sauerstoffgehalte die Analysentreffsicherheit und führen zu einem verstärkten Verbrauch von Legierungsmetallen."Method of lowering oxygen and hydrogen levels in low-carbon Steels "In steel production processes in which at the end of the refining process the If the carbon content in the metal falls below certain limit values, a metallurgically induced strong oxygen uptake. The hydrogen content in the Metal can rise sharply. However, there are increased oxygen and hydrogen contents undesirable for many steel grades because they reduce the technological properties of the finished steel deteriorate. Bel the steel making continue to complicate high oxygen levels improve the accuracy of the analysis and lead to an increased Alloy metal consumption.
Nach dem heutigen Stand der Technik kann der Sauerstoffgehalt in einer Stahlschmele nur durch die Zugabe von Desoxydationsmitteln oder durch eine Vakuumbehandlung oder durch die Kombination beider Möglichkeiten gesenkt werden.According to the current state of the art, the oxygen content in a Steel smelt only by adding deoxidizing agents or by vacuum treatment or can be reduced by a combination of both options.
Die Zugabe von Desoxydationsmitteln führt zu den unerwUnschten Desoxydationsprodukten, die häufig als nichtmetallische Einschlüsse im Stahl verbleiben und dort Fehlstellen im Metallgefüge darstellen. Die Vakuumbehandlung bietet neben der teilweisen Entfernung des Sauerstoffs auoh die Möglichkeit, den Wasserstoffgehalt in Grenzen zu senken.The addition of deoxidizing agents leads to undesired deoxidation products, which often remain in the steel as non-metallic inclusions and there are defects represent in the metal structure. The vacuum treatment offers apart from the partial removal of oxygen auoh die Possibility to keep the hydrogen content within limits to lower.
Ihr Nachteil besteht in der dafür aufzuwendenden Behandlungszeit und dem Temperaturverlust der Schmelze.Their disadvantage is the treatment time and the temperature loss of the melt.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs bezeichneten Art zu schaffen, das von den genannten Mängeln der soeben genannten bekannten Verfahren frei ist.The invention is based on the object of a method of the above designated type to create that of the shortcomings mentioned above known method is free.
Beim Verfahren nach der Erfindung handelt es sich um sogenannte Diffusionsdesoxydation, mittels deren in einem Frischgefäß, vorzugsweise einem Konverter, der Sauerstoffgehalt der Schmelze in weiten Grenzen gesenkt werden kann, wenn der Kohlenstoffgehalt der Stahlsohmelze dabei nicht Uber 0.05 beträgt. Erfindungsgemäß wird bei diesem Verfahren die über dem Metallbad befindliche Frischschlacke mit dem Metall innig durchmischt. Bei diesem Mischvorgang findet überraschenderweise ein Gleichgewichtsausgleich der Sauerstoffgehalte zwischen der Schlacke und der Schmelze statt, während bekanntermaßen sonst der Sauerstoffgehalt in der Schmelze im Frischgefäß bei den genannten Kohlenstoffgehalten immer weit über den Gleichgewichtswerten zwischen Metallschmelze und Schlacke liegt. Außerdem wird dabei, wahrscheinlich durch die Spülwirkung des durchströmenden Gases, der Wasserstoffgehalt in der Metallschmelze gesenkt.The method according to the invention is so-called diffusion deoxidation, by means of which in a fresh vessel, preferably a converter, the oxygen content the melt can be reduced within wide limits if the carbon content of the Steel molten mass does not exceed 0.05. According to the invention in this method the fresh slag located above the metal bath is intimately mixed with the metal. During this mixing process, surprisingly, there is an equilibrium balance Oxygen levels take place between the slag and the melt while known otherwise the oxygen content in the melt in the fresh vessel at the specified carbon content is always well above the equilibrium values between molten metal and slag. In addition, probably due to the purging effect of the gas flowing through, the hydrogen content in the molten metal is reduced.
Der Mischvorgang zwischen Schmelze und Schlacke wird zweckmäßig in einem bodenblasenden Konverter erfindungs gemäß durch das Einleiten von Stickstoff mit einem Druck von 2 bis 10 atü, vorzugsweise ca. 5 atü, anstelle von Wind oder Sauerstoff in die vorhandenen Frischgaseinlei tungsrohre vorgenommen. Es wurde gefunden, daß für die sichere Durchführung des Verfahrens der Restsauerstoffgehalt im Stickstoff 1% nicht übersteigt. Als weiterer Vorteil des erfindungsgemäßen Verfahrens hat sich die Abhängigkeit von Sauerstoff- und Phosphorgehalt in der Metallschmelze des Frischgefäßes herausgestellt. lurch die relativ einfache und genaue Analyse des Phosphorgehaltes in der Schmelze läßt sich mit einer Sicherheit von + 0.005% auf ihren Sauerstoffgehalt schließen.The mixing process between melt and slag is expedient in a bottom-blowing converter according to the invention by introducing nitrogen with a pressure of 2 to 10 atmospheres, preferably about 5 atmospheres, instead of wind or Oxygen is made in the existing Frischgaseinlei processing pipes. It was found, that for the safe implementation of the process, the residual oxygen content in the nitrogen Does not exceed 1%. As another Advantage of the invention The process has become dependent on the oxygen and phosphorus content in the molten metal of the fresh vessel exposed. The relatively simple and accurate analysis the phosphorus content in the melt can be determined with a certainty of + 0.005% infer their oxygen content.
Im folgenden ist ein typisches Beispiel für die Wirkungsweise des erfindungsgetnäßen Verfahrens zur Erniedrigung des Sauerstoff- und Wasserstoffgehaltes angegeben.The following is a typical example of how the Process according to the invention for lowering the oxygen and hydrogen content specified.
Analyse vor dem Mischen: Metallschmelze im Frisch- Schlacke im Frischgefäß gefäß [O] FeOn MnO CaO P205 SiO2 0.059 0.064 % 12.50 5.60 51.90 18.78 8.18 Analyse naoh dem Mischen: Metallsohmelze im Frisch- Schlacke im Frischgefäß gefäß [P] [O] FeOn MnO CaO P2O5 SiO2 0.039 0.043 % 12.10 5.60 52.85 18.26 8.39Analysis before mixing: metal melt in the fresh slag in the fresh vessel vessel [O] FeOn MnO CaO P205 SiO2 0.059 0.064% 12.50 5.60 51.90 18.78 8.18 Analysis after mixing: metal melt in the fresh slag in the fresh vessel vessel [P] [O] FeOn MnO CaO P2O5 SiO2 0.039 0.043% 12.10 5.60 52.85 18.26 8.39
Claims (1)
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19691909780 DE1909780A1 (en) | 1969-02-27 | 1969-02-27 | Quenching method for pig iron contng - phosphorous |
| NL6904755A NL6904755A (en) | 1969-02-27 | 1969-03-27 | |
| SU1319456A SU380016A1 (en) | 1969-04-02 | CONVERTER FOR REINFORCED CHUGUN | |
| NL7412180A NL7412180A (en) | 1969-02-27 | 1974-09-13 | Converter for refining high phosphorus - pig |
| NL7412181A NL7412181A (en) | 1969-02-27 | 1974-09-13 | |
| NL7412182A NL164324C (en) | 1969-02-27 | 1974-09-13 | CONVERTER FOR OXYGEN FRESHING IRON. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19691909780 DE1909780A1 (en) | 1969-02-27 | 1969-02-27 | Quenching method for pig iron contng - phosphorous |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1909780A1 true DE1909780A1 (en) | 1970-11-19 |
Family
ID=5726444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19691909780 Pending DE1909780A1 (en) | 1969-02-27 | 1969-02-27 | Quenching method for pig iron contng - phosphorous |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1909780A1 (en) |
| NL (1) | NL6904755A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2346087A1 (en) * | 1973-09-13 | 1975-03-27 | Baum Verfahrenstechnik | METHOD AND DEVICE FOR AVOIDING SMOKE AND FLAME FORMATION IN BOTTOM-BUBBLE CONVERTERS |
| EP0087328A1 (en) * | 1982-01-22 | 1983-08-31 | Union Carbide Corporation | Process to produce low hydrogen steel by argon-oxygen decarburization |
| EP0097971A3 (en) * | 1982-06-29 | 1984-02-08 | Union Carbide Corporation | Method for producing low hydrogen content in steels produced by subsurface pneumatic refining |
-
1969
- 1969-02-27 DE DE19691909780 patent/DE1909780A1/en active Pending
- 1969-03-27 NL NL6904755A patent/NL6904755A/xx unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2346087A1 (en) * | 1973-09-13 | 1975-03-27 | Baum Verfahrenstechnik | METHOD AND DEVICE FOR AVOIDING SMOKE AND FLAME FORMATION IN BOTTOM-BUBBLE CONVERTERS |
| EP0087328A1 (en) * | 1982-01-22 | 1983-08-31 | Union Carbide Corporation | Process to produce low hydrogen steel by argon-oxygen decarburization |
| EP0097971A3 (en) * | 1982-06-29 | 1984-02-08 | Union Carbide Corporation | Method for producing low hydrogen content in steels produced by subsurface pneumatic refining |
Also Published As
| Publication number | Publication date |
|---|---|
| NL6904755A (en) | 1970-08-31 |
| SU380016A3 (en) | 1973-04-20 |
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