CN101880747A - Clean steel production method for reducing molten steel total oxygen content - Google Patents
Clean steel production method for reducing molten steel total oxygen content Download PDFInfo
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- CN101880747A CN101880747A CN2009100114694A CN200910011469A CN101880747A CN 101880747 A CN101880747 A CN 101880747A CN 2009100114694 A CN2009100114694 A CN 2009100114694A CN 200910011469 A CN200910011469 A CN 200910011469A CN 101880747 A CN101880747 A CN 101880747A
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Abstract
The invention discloses a clean steel production method for reducing the molten steel total oxygen content. In the molten steel refining process, when the molten steel deoxidation is in a completely still state, mixed powder is added into ladles with the addition of 0.5 percent to 1.0 percent of the weight of the molten steel, the bottom argon gas blowing and the stirring of the ladles are started to carry out after the mixed powder is added, the bottom argon gas blowing flow rate is between 15 and 25Nm<3>/h, and the bottom blowing time is between 5 and 15min. The mixed powder is prepared by mixing metallurgy lime with the granularity lower than 1mm, aluminum powder with the granularity between -100 meshes and +200 meshes and fluorspar powder with the granularity lower than 1mm. The ingredients have the mass percent as follows: 75 to 79 percent of CaO, 10 to 15 percent of Al, 2 to 4 percent of CaF2 and the balance unavoidable impurities. The invention can reduce the total oxygen content in the molten steel to a value lower than 15ppm, and the cleanness of the molten steel can be improved.
Description
Technical field
The present invention relates to a kind of steelmaking technical field, especially a kind of clean steel production method that reduces molten steel total oxygen content.
Background technology
Along with the continuous increase of market to the Clean Steel demand, each big steel mill when exploitation and having innovated many Clean Steel production modern techniquies, constantly enlarges the production of high value added product in order to occupy the bigger market share and to pursue higher profit both at home and abroad.All trades and professions are more and more higher to the requirement of steel performance and quality.Have only the content that reduces impurity element in the steel significantly, could control the quantity and the form of nonmetallic inclusionsin steel effectively, different steel grades are different with susceptibility to inclusion to the requirement of purity.Can cause automobile and electric product surface of thin steel sheet defective as aluminum oxide bunch inclusion, cause DI jar thin plate crackle, also can cause wire rod broken strings such as tire meridian, make the fatigue property deterioration of bar steels such as bearing steel.Inclusion massfraction in the different purposes steel is different with dimensional requirement.Therefore, in order to alleviate of the detrimentally affect of oxide based inclusion, must reduce inclusion content of steel to steel product quality.
Produce Clean Steel, the one, improve the purity of steel, the 2nd, the quantity and the form of strict control nonmetallic inclusionsin steel.Different steel grades are different with susceptibility to inclusion to the requirement of purity.Clean Steel and non-metallic inclusion are the scientific research focuses on current metallurgical boundary.
Along with the development of technology, the span of control of molten steel composition is more and more narrow, and the mechanical property of steel is more stable.Multiple operation is smelted stage by stage, and it is development trend that economy of large scale ground produces Clean Steel.
The total oxygen content of molten steel can react the weight of oxide inclusion in the molten steel, and control reduces total oxygen content in the molten steel, promptly is to reduce oxide inclusion in the molten steel.
Summary of the invention
The object of the present invention is to provide a kind of clean steel production method that reduces molten steel total oxygen content, in the liquid steel refining process, by adding mixing powder, react with the slag in the ladle, carry out the steel ladle bottom argon blowing gas mixing simultaneously and mix, reduce total oxygen content in the molten steel, improve the cleanliness factor of molten steel.
The object of the present invention is achieved like this, a kind of clean steel production method that reduces molten steel total oxygen content,
-100 orders～+ 200 orders), fluorite powder (granularity: 1mm is following) mixes 1. preparation pulvis utilizes metallurgical lime (granularity: 1mm is following), aluminium powder (granularity:; Component ratio (mass percent) is: by 75%～79%CaO, 10%～15%Al, 2%～4%CaF
2, all the other are unavoidable impurities.
2. at aluminium killed steel class Clean Steel, in the liquid steel refining process, under the complete sedation of deoxidation of molten steel, in ladle, carry out argon bottom-blowing behind the above-mentioned mixing powder of input and stir.
The molten steel condition: the molten steel oxygen activity is less than 0.001%, and temperature is 1550 ℃～1650 ℃.
Concrete technology: drop into mixing powder in ladle, input amount is 0.5%～1.0% of a molten steel weight, and promptly 100 tons of molten steel drop into mixing powder 500～1000kg; After dropping into mixing powder, begin to carry out the steel ladle bottom argon blowing gas mixing and mix, the argon bottom-blowing flow is 15～25Nm
3/ h, the bottom blowing time is 5～15min.
The present invention utilizes the mixing powder of formulating size range, in the liquid steel refining process, add in the ladle, by with ladle in slag react, carrying out the steel ladle bottom argon blowing gas mixing simultaneously mixes, can reduce total oxygen content in the molten steel, total oxygen content can be reduced to below the 15ppm in the molten steel, improves the cleanliness factor of molten steel.
Embodiment
A kind of clean steel production method that reduces molten steel total oxygen content of the present invention at aluminium killed steel class Clean Steel, in the liquid steel refining process, under the complete sedation of deoxidation of molten steel, drops into mixing powder in ladle, input amount is 0.5%～1.0% of a molten steel weight; After dropping into mixing powder, begin to carry out the steel ladle bottom argon blowing gas mixing and mix, the argon bottom-blowing flow is 15～25Nm
3/ h, the bottom blowing time is 5～15min.The complete sedation of deoxidation of molten steel is meant: the molten steel oxygen activity is less than 0.001%, and temperature is 1550 ℃～1650 ℃.Mixing powder is that the metallurgical lime, granularity-100 order～+ 200 purpose aluminium powders, the following fluorite powder of granularity 1mm that utilize granularity 1mm following mix; The mass percent of component is: 75%～79%CaO, 10%～15%Al, 2%～4%CaF
2, all the other are unavoidable impurities.
Embodiment one:
Steel grade: aluminium killed steel (IF steel)
Embodiment two:
Steel grade: aluminium killed steel (IF steel)
Claims (3)
1. clean steel production method that reduces molten steel total oxygen content, it is characterized in that at aluminium killed steel class Clean Steel, in the liquid steel refining process, under the complete sedation of deoxidation of molten steel, drop into mixing powder in ladle, input amount is 0.5%～1.0% of a molten steel weight; After dropping into mixing powder, begin to carry out the steel ladle bottom argon blowing gas mixing and mix, the argon bottom-blowing flow is 15～25Nm
3/ h, the bottom blowing time is 5～15min.
2. the clean steel production method of reduction molten steel total oxygen content according to claim 1 is characterized in that the complete sedation of deoxidation of molten steel is meant: the molten steel oxygen activity is less than 0.001%, and temperature is 1550 ℃～1650 ℃.
3. the clean steel production method of reduction molten steel total oxygen content according to claim 1 and 2 is characterized in that mixing powder is that metallurgical lime, granularity-100 order～+ 200 purpose aluminium powders, the following fluorite powder of granularity 1mm that utilizes granularity 1mm following mixes; The mass percent of component is: 75%～79%CaO, 10%～15%Al, 2%～4%CaF
2, all the other are unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910011469.4A CN101880747B (en) | 2009-05-06 | 2009-05-06 | Clean steel production method for reducing molten steel total oxygen content |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910011469.4A CN101880747B (en) | 2009-05-06 | 2009-05-06 | Clean steel production method for reducing molten steel total oxygen content |
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| CN101880747A true CN101880747A (en) | 2010-11-10 |
| CN101880747B CN101880747B (en) | 2014-01-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102277471A (en) * | 2011-08-03 | 2011-12-14 | 攀钢集团成都钢钒有限公司 | Manufacturing method of steel |
| CN106270421A (en) * | 2015-05-28 | 2017-01-04 | 鞍钢股份有限公司 | A kind of improve the method that aluminum killed steel waters time head base cleanliness factor |
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| CN1375562A (en) * | 2002-01-07 | 2002-10-23 | 张炼 | Composite metallurgical refining agent |
| CN101319265A (en) * | 2008-07-17 | 2008-12-10 | 鞍钢股份有限公司 | Powder preparation additive for outside-stove refining dephosphorization, removing fine foreign matter and its manufacturing method |
| CN101323894A (en) * | 2008-07-30 | 2008-12-17 | 鞍钢股份有限公司 | Technological process for removing small inclusions in secondary refining |
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2009
- 2009-05-06 CN CN200910011469.4A patent/CN101880747B/en active Active
Patent Citations (3)
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| CN1375562A (en) * | 2002-01-07 | 2002-10-23 | 张炼 | Composite metallurgical refining agent |
| CN101319265A (en) * | 2008-07-17 | 2008-12-10 | 鞍钢股份有限公司 | Powder preparation additive for outside-stove refining dephosphorization, removing fine foreign matter and its manufacturing method |
| CN101323894A (en) * | 2008-07-30 | 2008-12-17 | 鞍钢股份有限公司 | Technological process for removing small inclusions in secondary refining |
Non-Patent Citations (2)
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| 国际钢铁协会: "《洁净钢——洁净钢生产工艺技术》", 31 October 2006, 冶金工业出版社 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102277471A (en) * | 2011-08-03 | 2011-12-14 | 攀钢集团成都钢钒有限公司 | Manufacturing method of steel |
| CN102277471B (en) * | 2011-08-03 | 2013-09-11 | 攀钢集团成都钢钒有限公司 | Manufacturing method of steel |
| CN106270421A (en) * | 2015-05-28 | 2017-01-04 | 鞍钢股份有限公司 | A kind of improve the method that aluminum killed steel waters time head base cleanliness factor |
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| CN101880747B (en) | 2014-01-01 |
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