JPS57155314A - Refining of high-cr steel - Google Patents
Refining of high-cr steelInfo
- Publication number
- JPS57155314A JPS57155314A JP2718381A JP2718381A JPS57155314A JP S57155314 A JPS57155314 A JP S57155314A JP 2718381 A JP2718381 A JP 2718381A JP 2718381 A JP2718381 A JP 2718381A JP S57155314 A JPS57155314 A JP S57155314A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- added
- decarburization
- fluidity
- furnace
- 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
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
PURPOSE: To raise the fluidity of slag as well as the reduction speed of Cr by causing the reaction of a Si-containing substance or Al added to slag with O2 to take place during the chromium oxide reduction period in a refining method using a refining furnace having tuyere on its bottom and the lower part of its wall.
CONSTITUTION: Decarburization and dephosphorization are performed by blowing O2 through a top blow lance into molten pig iron in a composite blow furnace and also Ar gas through a tuyere into the bottom of the furnace. After these processes proceed to a given extent, a Cr-containing substances as the main component of a high-Cr steel is added to the molten pig iron at a proper time and the decarburization is continued. Then, as a given degree of decarburization advanced, the blowing of O2 is stopped, whereupon part of Cr added is converted into oxide and absorbed in slag to drastically lower the fluidity of the slag. At the time, an Fe-Si alloy in an amount necessary for the reduction of Cr oxide in the slag and also for adjustment of Si content of molten steel and also Al in amount necessary for obtaining a desired rise of temperature by the oxidation of Si or Al are added to the molten slag. O2 is blown onto the slag for oxidation to increase the temperature and fluidity of the slag.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2718381A JPS57155314A (en) | 1981-02-25 | 1981-02-25 | Refining of high-cr steel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2718381A JPS57155314A (en) | 1981-02-25 | 1981-02-25 | Refining of high-cr steel |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57155314A true JPS57155314A (en) | 1982-09-25 |
JPS6159366B2 JPS6159366B2 (en) | 1986-12-16 |
Family
ID=12213957
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2718381A Granted JPS57155314A (en) | 1981-02-25 | 1981-02-25 | Refining of high-cr steel |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57155314A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008519906A (en) * | 2004-11-12 | 2008-06-12 | エス・エム・エス・デマーク・アクチエンゲゼルシャフト | Manufacturing method of AISI standard 4xx ferritic steel class in AOD converter |
JP2009120884A (en) * | 2007-11-13 | 2009-06-04 | Nippon Yakin Kogyo Co Ltd | Method for refining stainless steel |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3754894A (en) * | 1972-04-20 | 1973-08-28 | Joslyn Mfg & Supply Co | Nitrogen control in argon oxygen refining of molten metal |
JPS5213493A (en) * | 1975-07-23 | 1977-02-01 | Nippon Steel Corp | Apparatus for treating molten slag |
JPS5432119A (en) * | 1977-08-17 | 1979-03-09 | Sumitomo Metal Ind Ltd | Refining method for high chromium steel |
-
1981
- 1981-02-25 JP JP2718381A patent/JPS57155314A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3754894A (en) * | 1972-04-20 | 1973-08-28 | Joslyn Mfg & Supply Co | Nitrogen control in argon oxygen refining of molten metal |
JPS5213493A (en) * | 1975-07-23 | 1977-02-01 | Nippon Steel Corp | Apparatus for treating molten slag |
JPS5432119A (en) * | 1977-08-17 | 1979-03-09 | Sumitomo Metal Ind Ltd | Refining method for high chromium steel |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008519906A (en) * | 2004-11-12 | 2008-06-12 | エス・エム・エス・デマーク・アクチエンゲゼルシャフト | Manufacturing method of AISI standard 4xx ferritic steel class in AOD converter |
JP2009120884A (en) * | 2007-11-13 | 2009-06-04 | Nippon Yakin Kogyo Co Ltd | Method for refining stainless steel |
Also Published As
Publication number | Publication date |
---|---|
JPS6159366B2 (en) | 1986-12-16 |
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