JPS6428320A - Method for melting dead low carbon and low nitrogen steel - Google Patents
Method for melting dead low carbon and low nitrogen steelInfo
- Publication number
- JPS6428320A JPS6428320A JP18233287A JP18233287A JPS6428320A JP S6428320 A JPS6428320 A JP S6428320A JP 18233287 A JP18233287 A JP 18233287A JP 18233287 A JP18233287 A JP 18233287A JP S6428320 A JPS6428320 A JP S6428320A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- submerged
- blowing
- circulating flow
- flow gas
- 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
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
PURPOSE:To promote decarbonizing and denitrogenizing reactions in molten steel and to stably produce dead low carbon and low nitrogen steel by degassed-refining the molten steel with RH type vacuum degassing apparatus, etc., and also blowing Magnesio-wustite powdery body together with the circulating flow gas. CONSTITUTION:Non-deoxidizing molten steel 1 produced by oxygen blowing from the molten iron in a converter, etc., is charged into a ladle 2 and two submerged tubes 3 for the vacuum degassing apparatus are submerged and the pressure in the vacuum vessel 5 is reduced through an exhausting tube 4, and by injecting the circulating flow gas 6 of Ar, etc., from the uptake submerged tube 3 at one side, the molten steel 1 is circulated between a ladle 2 and the vacuum vessel 5 through both submerged tubes. The molten steel 1 is beforehand deoxidzed by addition of the deoxidizing agent of Al, etc., to come to about 0.005-0.20% of dissolved oxygen concn. By blowing the circulating flow gas 6 and also the Magnesio-wustite powdery body 8 from the powdery body blowing nozzle 7 arranged below the molten steel surface of the downtake submerged tube side in the vacuum vessel 5 at the position of 30-70mm, the decarbonizing and denitrogenizing reactions are promoted at the same time while holding the O2 concn. to 0.005-0.02%, to stably produce the dead low carbon and low nitrogen steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18233287A JPS6428320A (en) | 1987-07-23 | 1987-07-23 | Method for melting dead low carbon and low nitrogen steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18233287A JPS6428320A (en) | 1987-07-23 | 1987-07-23 | Method for melting dead low carbon and low nitrogen steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6428320A true JPS6428320A (en) | 1989-01-30 |
Family
ID=16116455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18233287A Pending JPS6428320A (en) | 1987-07-23 | 1987-07-23 | Method for melting dead low carbon and low nitrogen steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6428320A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100388024B1 (en) * | 1996-11-21 | 2003-10-17 | 주식회사 포스코 | Method for refining steel containing ultra-low carbon and ultra-low nitrogen |
| JP2007064432A (en) * | 2005-09-01 | 2007-03-15 | Honda Motor Co Ltd | Shift device of automatic transmission |
-
1987
- 1987-07-23 JP JP18233287A patent/JPS6428320A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100388024B1 (en) * | 1996-11-21 | 2003-10-17 | 주식회사 포스코 | Method for refining steel containing ultra-low carbon and ultra-low nitrogen |
| JP2007064432A (en) * | 2005-09-01 | 2007-03-15 | Honda Motor Co Ltd | Shift device of automatic transmission |
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