JPS5497516A - Production of low phosphorus steel by double slag blow smelting - Google Patents
Production of low phosphorus steel by double slag blow smeltingInfo
- Publication number
- JPS5497516A JPS5497516A JP467178A JP467178A JPS5497516A JP S5497516 A JPS5497516 A JP S5497516A JP 467178 A JP467178 A JP 467178A JP 467178 A JP467178 A JP 467178A JP S5497516 A JPS5497516 A JP S5497516A
- Authority
- JP
- Japan
- Prior art keywords
- blow
- smelting
- steel
- minute
- half period
- 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
- C21C5/32—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:In converter double-slag blow-smelting of steel, particularly in the primary blow-smelting, the process is carried out by using hard blow in the former half period and soft blow in the later half blow. The soft blow is applied with additional short-time hard blow thereby assuredly providing low phosphorus steel. CONSTITUTION:For oxidation-smelting, oxygen is jetted from the lance 3 mounted above the molten steel 2 in the converter 1. In the former half period of the primary blow-smelting, a 5-minute hard blow of oxygen jet is performed so that the molten metal surface is depressed by the depth L and that the ratio L/L0 should be 0.29 to 0.32, where L0 indicates the depth of molten steel 2. Then, in the latter half period, a 5-minute soft blow is carried out so that L/L0 will be 0.10 to 0.22, with the process including one or more of short-time hard blow of about 0.3 L/L0. The process oxidizes phosphorus present in the molten steel causing phophorus to move into the slag which is exhausted. Then, a 10-minute secondary smelting process with about 0.24 L/L0 is performed to produce low-phosphorus steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP467178A JPS5497516A (en) | 1978-01-18 | 1978-01-18 | Production of low phosphorus steel by double slag blow smelting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP467178A JPS5497516A (en) | 1978-01-18 | 1978-01-18 | Production of low phosphorus steel by double slag blow smelting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5497516A true JPS5497516A (en) | 1979-08-01 |
Family
ID=11590360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP467178A Pending JPS5497516A (en) | 1978-01-18 | 1978-01-18 | Production of low phosphorus steel by double slag blow smelting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5497516A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108085449A (en) * | 2017-12-14 | 2018-05-29 | 武汉钢铁有限公司 | The method of the double slag production ultra-low phosphoretic steels of converter |
-
1978
- 1978-01-18 JP JP467178A patent/JPS5497516A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108085449A (en) * | 2017-12-14 | 2018-05-29 | 武汉钢铁有限公司 | The method of the double slag production ultra-low phosphoretic steels of converter |
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