JPS5594426A - Converter steel making method which lowers phosphorus amount in molten steel - Google Patents
Converter steel making method which lowers phosphorus amount in molten steelInfo
- Publication number
- JPS5594426A JPS5594426A JP331579A JP331579A JPS5594426A JP S5594426 A JPS5594426 A JP S5594426A JP 331579 A JP331579 A JP 331579A JP 331579 A JP331579 A JP 331579A JP S5594426 A JPS5594426 A JP S5594426A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- molten
- oxygen
- blowing
- molten steel
- 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.)
- Granted
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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
Abstract
PURPOSE:To produce the steel of less P content and target C grade by suspending the oxygen blowing operation at the specific point during steel making and refining with an oxygen top blowing converter, stirring the molten metal by blowing inert gas or the like with an immersion lance then tapping the steel. CONSTITUTION:Raw material molten iron and slag forming agents such as lime are charged into an LD converter and the lance is lowered at a fixed distance on the molten steel to top-blow oxygen, whereby steel is produced. C is oxidation-removed by the oxygen blowing and is decarbonized down to the C content close to C of produced steel kind of 0.1% or more. At this time, the oxygen blowing is suspended and inert gas such as Ar or N2 is blown at ratios of 0.02-1.0Nm<3>/mit/ton with the lance dipped in the molten steel to bubble the molten steel and improve the contact of the molten steel and oxidative basic slag. In addition, the bubbling results in the lowered temperature of the molten metal, hence lowered temperature of dephosphorization conditions, thus promoting the dephosphorization reaction owing to the presence of the oxidative and strong basic slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP331579A JPS5594426A (en) | 1979-01-12 | 1979-01-12 | Converter steel making method which lowers phosphorus amount in molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP331579A JPS5594426A (en) | 1979-01-12 | 1979-01-12 | Converter steel making method which lowers phosphorus amount in molten steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5594426A true JPS5594426A (en) | 1980-07-17 |
| JPS572766B2 JPS572766B2 (en) | 1982-01-18 |
Family
ID=11553916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP331579A Granted JPS5594426A (en) | 1979-01-12 | 1979-01-12 | Converter steel making method which lowers phosphorus amount in molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5594426A (en) |
-
1979
- 1979-01-12 JP JP331579A patent/JPS5594426A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS572766B2 (en) | 1982-01-18 |
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