JPS57171616A - Production of clean steel - Google Patents
Production of clean steelInfo
- Publication number
- JPS57171616A JPS57171616A JP5776081A JP5776081A JPS57171616A JP S57171616 A JPS57171616 A JP S57171616A JP 5776081 A JP5776081 A JP 5776081A JP 5776081 A JP5776081 A JP 5776081A JP S57171616 A JPS57171616 A JP S57171616A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- al2o3
- oxygen
- nonmetallic inclusions
- deoxidizing
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
PURPOSE:To produce clean steel of less nonmetallic inclusions and content of oxygen by deoxidizing molten steel with Al after oxidation decarburization and refining and further reducing the content of oxygen therein with treatment such as vacuum degassing, bubbling then further deoxidizing the same with Ca. CONSTITUTION:After molten steel is oxidation decarburized and refined, Al which is a deoxidizing agent is added thereto to remove the oxygen contained therein as Al2O3. Since this molten steel contains Al2O3 as the product of deoxidation in the form of nonmetallic inclusions and contains residual dissolved oxygen, the floating of the nonmetallic inclusions such as Al2O3 is accelerated by DH vacuum degassing treatment or bubbling treatment by an inert gas, whereby said inclusions are separated and the dissolved oxygen in the molten steel is reduced so that the T[O]in the molten steel is reduced to <=50ppm. Next, a Ca-contg. deoxidizing agent such as Ca-Si is added to the molten steel at <=0.5kg ratio in terms of Ca per ton of the molten steel to deoxidize the Ca as CaO and to convert the same to spheroidal nonmetallic inclusions of CaO- Al2O3, whereby the degradation in the material of the steel pipe in rolling or the like is prevented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5776081A JPS57171616A (en) | 1981-04-15 | 1981-04-15 | Production of clean steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5776081A JPS57171616A (en) | 1981-04-15 | 1981-04-15 | Production of clean steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57171616A true JPS57171616A (en) | 1982-10-22 |
Family
ID=13064828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5776081A Pending JPS57171616A (en) | 1981-04-15 | 1981-04-15 | Production of clean steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57171616A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002285290A (en) * | 2001-03-27 | 2002-10-03 | Daido Steel Co Ltd | High strength and highly fatigue resistant steel for structural purpose and production method therefor |
| KR100916098B1 (en) | 2002-12-24 | 2009-09-08 | 주식회사 포스코 | Method for Refining Steel Pipe Containing Ca |
-
1981
- 1981-04-15 JP JP5776081A patent/JPS57171616A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002285290A (en) * | 2001-03-27 | 2002-10-03 | Daido Steel Co Ltd | High strength and highly fatigue resistant steel for structural purpose and production method therefor |
| KR100916098B1 (en) | 2002-12-24 | 2009-09-08 | 주식회사 포스코 | Method for Refining Steel Pipe Containing Ca |
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