JPS5743917A - Method for melting extra low phosphorus steel using single slag - Google Patents
Method for melting extra low phosphorus steel using single slagInfo
- Publication number
- JPS5743917A JPS5743917A JP11900380A JP11900380A JPS5743917A JP S5743917 A JPS5743917 A JP S5743917A JP 11900380 A JP11900380 A JP 11900380A JP 11900380 A JP11900380 A JP 11900380A JP S5743917 A JPS5743917 A JP S5743917A
- Authority
- JP
- Japan
- Prior art keywords
- blown
- blow
- steel
- gas
- 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.)
- Pending
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
- C21C5/35—Blowing from above and through the bath
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
Abstract
PURPOSE:To melt an extra low phosphorus steel easily and by an inexpensive single-slag process by a method wherein a top-blown converter aided by the bottom blowing is used and a particular means for easy and appropriate judgement of slag-forming conditions is combined with an ordinary means for measuring the steel bath temperature. CONSTITUTION:Into the converter, an inert gas such as N2 is blown as a bottom-blown gas for stirring and a pure O2 gas is blown as a top-blown gas. Measurement of the steel bath in the blow refining process is conducted at respective degrees of progress of the blow process, for example, at 30%, at about 50% and at 80%, and the rise of the steel bath temperature in the period between the measurements is controlled by supplying a coolant such as iron ore to perform a low-temperature blow refining. Then, after the degree of progress of the blow refining has reached 80%, an extra soft blow of the top-blown gas is provided so that the jet penetration ratio L/L0 becomes 0.25-0.35. For this purpose, the O2 flow rate is set to be 1.25-1.75Nm<3>/min per ton of molten steel and the lance height is set to be 1.8- 2.0m. In addition, a hard blow of the bottom-blown gas such as to provide a flow rate of 0.01-0.2Nm<3>/min per ton of molten steel is used to vigorously stir the molten steel. In the above-mentioned ratio L/L0, L0 represents the depth of the bath surface of the molten steel in a static condition and L represents the depth of the bath surface at a recessed part formed by the O2 jet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11900380A JPS5743917A (en) | 1980-08-30 | 1980-08-30 | Method for melting extra low phosphorus steel using single slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11900380A JPS5743917A (en) | 1980-08-30 | 1980-08-30 | Method for melting extra low phosphorus steel using single slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5743917A true JPS5743917A (en) | 1982-03-12 |
Family
ID=14750584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11900380A Pending JPS5743917A (en) | 1980-08-30 | 1980-08-30 | Method for melting extra low phosphorus steel using single slag |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5743917A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009270136A (en) * | 2008-05-01 | 2009-11-19 | Kobe Steel Ltd | Converter-blowing method for ultra-low carbon steel using general pig iron |
| CN110616290A (en) * | 2019-09-30 | 2019-12-27 | 山东钢铁股份有限公司 | Converter single slag remaining smelting method capable of reducing final slag height |
-
1980
- 1980-08-30 JP JP11900380A patent/JPS5743917A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009270136A (en) * | 2008-05-01 | 2009-11-19 | Kobe Steel Ltd | Converter-blowing method for ultra-low carbon steel using general pig iron |
| CN110616290A (en) * | 2019-09-30 | 2019-12-27 | 山东钢铁股份有限公司 | Converter single slag remaining smelting method capable of reducing final slag height |
| CN110616290B (en) * | 2019-09-30 | 2021-06-18 | 山东钢铁股份有限公司 | Converter single slag remaining smelting method capable of reducing final slag height |
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