CN102443679A - Production method of ultralow oxide inclusion steel - Google Patents
Production method of ultralow oxide inclusion steel Download PDFInfo
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- CN102443679A CN102443679A CN201110403479XA CN201110403479A CN102443679A CN 102443679 A CN102443679 A CN 102443679A CN 201110403479X A CN201110403479X A CN 201110403479XA CN 201110403479 A CN201110403479 A CN 201110403479A CN 102443679 A CN102443679 A CN 102443679A
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Abstract
The invention discloses a production method of ultralow oxide inclusion steel. The method adopts a twice vacuum treatment technology. The first vacuum treatment utilizes carbon for deoxidization to reduce the content of free oxygen. The second vacuum treatment makes inclusions fully float upward so as to facilitate removal of free oxygen. LF (ladle refining) furnace treatment is added between the two vacuum treatment technologies to guarantee the temperature rising effect of molten steel. And aluminum is added for further removal of oxygen content from the steel so as to form slag easy to adsorb inclusions. Meanwhile, at the later stage of the second vacuum treatment, a weak argon blowing technology is adopted to further promote the floating and removal of inclusions. Application of the method provided in the invention can control the oxygen content of steel below 5ppm stably, and can realize an average of over 3 tanks of continuous casting during one time casting.
Description
Technical field
The invention belongs to the process for making technical field, particularly a kind of production control method of ultra-low oxidized inclusion steel grade.
Background technology
Development along with the smelting iron and steel technology; Requirement to the molten steel cleanliness factor is also increasingly high; The exploitation of high tensile steels such as particularly senior bearing steel, senior line of cut, senior cord steel and liquefied gas storage tank has all proposed higher explicitly calling for to the steel grade inclusion, and requires more and more high.Weighing what key index of oxide inclusion is the content of ［ Or ］ in the steel.At present, the content of ［ Or ］ reaches below the 10ppm in some steel grade finished product material survey requirement steel, and promptly so-called ultra-low oxidized inclusion steel, even some extremely special steel grade require ［ Or ］ to reach below the 5ppm.How be controlled at below the 5ppm ［ Or ］ in the steel is stable, and possess mass production environment, become an important topic that needs to be resolved hurrily.
Summary of the invention
The object of the invention is exactly in order to address the above problem, and can ［ Or ］ in the steel be controlled at below the 5ppm thereby provide a kind of, and realize singly watering the inferior working method that connects the ultra-low oxidized inclusion steel that waters more than 3 jars that reaches.
For reaching this purpose, the present invention has taked following technical solution:
A kind of working method of ultra-low oxidized inclusion steel is taked vacuum processing technique twice, and between twice vacuum processing technique, adds LF stove treatment process, carries out weak Argon operation after vacuum-treat finishes; Its concrete grammar is:
Vacuum-treat for the first time requires:
(1), converter tapping takes not deoxidation, boiling tapping, converter tapping carbon weight percent is controlled at 0.08-0.12%;
(2), move into vacuum apparatus after, the ratio that adds 1kg in steel per ton adds carburelant, improves C-O speed of response;
(3), vacuum processing time is controlled at 13-18min, argon blowing rate is 400-500Nl/min, treat that the molten steel face steadily after, broken empty, remove to the LF stove and handle;
(4), the whole vacuum processing time of moving into certainly behind the vacuum apparatus is controlled at 35-45 min;
The LF stove is handled:
(1), do not carry out big argon gas during the LF stove heat treated and stir, desulfurization is all carried out under high vacuum condition with the adjustment composition;
(2), LF stove basicity of slag is controlled at 2.8-3.2, temperature reaches into vacuum and promptly moves into the vacuum-treat zone after requiring;
(3), the whole LF stove treatment time is controlled at 60-80 min;
Vacuum-treat for the second time requires:
(1), vacuum processing time is controlled at 15 min;
(2), the ladle argon-blown flow control of vacuum-treat stage is at 500Nl/min;
(3), this time in stage is controlled at 35-45 min;
Vacuum-treat is carried out weak Argon after finishing on vacuum apparatus:
(1), weak argon blowing rate is controlled at 100-300Nl/min;
(2), weak argon blowing time is controlled at 14-16 min.
Positively effect of the present invention is:
Owing to the present invention is directed to technical problem to be solved, take vacuum processing technique twice, vacuum-treat for the first time utilizes the carbon deoxidation, can effectively reduce the content of free oxygen in the steel.Vacuum-treat for the second time can make inclusion fully float, and helps the eliminating of free oxygen.
Owing between twice vacuum processing technique, add LF stove treatment process, both can guarantee the intensification effect of molten steel, and utilize and add aluminium and further remove oxygen content in steel, form the slag that is easy to dross inclusion adsorption.Simultaneously,, take weak Argon technology, can further promote floating foreign and eliminating in the vacuum-treat later stage second time.
Through production practice checks, embodiment of the present invention, can be controlled at below the 5ppm oxygen content in steel is stable, and realize singly watering time on average connecting and water more than 3 jars.
Embodiment
Adopt 100 tons of converters, 100 tons of LF stoves, 100 tons of vacuum treatment devices are produced the GCr15 steel grade.
Embodiment 1:
Vacuum processing technique for the first time:
1, converter tapping is taked not deoxidation, boiling tapping, and converter tapping carbon weight percent is controlled at 0.09%.
2, move into vacuum apparatus after, add the 100kg carburelant, improve C-O speed of response.
3, vacuum processing time is controlled at 15min, and argon blowing rate is 400Nl/min, treat that the molten steel face steadily after, broken empty, remove to the LF stove and handle.
4, whole vacuum processing time is controlled at 43 min.
LF stove treatment process:
1, do not carry out big argon gas during the LF stove heat treated and stir, desulfurization is all carried out under high vacuum condition with the adjustment composition.
2, LF stove basicity of slag is controlled at 2.9, and temperature reaches into promptly moves into the vacuum-treat zone after the vacuum requirement.
3, this time in stage is controlled at 65 min.
Vacuum processing technique for the second time:
1, vacuum processing time is controlled at 15 min.
2, the ladle argon-blown flow control of vacuum-treat stage is at 500Nl/min.
3, this time in stage is controlled at 40 min;
Vacuum-treat is carried out weak Argon after finishing on vacuum apparatus:
Weak argon blowing rate is controlled at 160Nl/min; Weak argon blowing time is controlled at 16 min.
Embodiment 2:
Vacuum processing technique for the first time:
1, not deoxidation of converter tapping, boiling tapping, converter tapping carbon weight percent is controlled at 0.11%.
2, move into vacuum apparatus after, add the 100kg carburelant.
3, vacuum processing time is controlled at 17min, and argon blowing rate is 480Nl/min, treat that the molten steel face steadily after, broken empty, remove to the LF stove and handle.
4, whole vacuum processing time is controlled at 36 min.
LF stove treatment process:
1, do not carry out big argon gas during the LF stove heat treated and stir, desulfurization is all carried out under high vacuum condition with the adjustment composition.
2, LF stove basicity of slag is controlled at 3.1, and temperature reaches into promptly moves into the vacuum-treat zone after the vacuum requirement.
3, this time in stage is controlled at 80 min.
Vacuum processing technique for the second time:
1, vacuum processing time is controlled at 15 min.
2, the ladle argon-blown flow control of vacuum-treat stage is at 500Nl/min.
3, this time in stage is controlled at 37 min.
Vacuum-treat is carried out weak Argon after finishing on vacuum apparatus:
Weak argon blowing rate is controlled at 280Nl/min; Weak argon blowing time is controlled at 14 min.
Claims (1)
1. the working method of a ultra-low oxidized inclusion steel is characterized in that, takes vacuum processing technique twice, and between twice vacuum processing technique, adds LF stove treatment process, carries out weak Argon operation after vacuum-treat finishes; Its concrete grammar is:
Vacuum-treat for the first time requires:
(1), converter tapping takes not deoxidation, boiling tapping, converter tapping carbon weight percent is controlled at 0.08-0.12%;
(2), move into vacuum apparatus after, the ratio that adds 1kg in steel per ton adds carburelant, improves C-O speed of response;
(3), vacuum processing time is controlled at 13-18min, argon blowing rate is 400-500Nl/min, treat that the molten steel face steadily after, broken empty, remove to the LF stove and handle;
(4), the whole vacuum processing time of moving into certainly behind the vacuum apparatus is controlled at 35-45 min;
The LF stove is handled:
(1), do not carry out big argon gas during the LF stove heat treated and stir, desulfurization is all carried out under high vacuum condition with the adjustment composition;
(2), LF stove basicity of slag is controlled at 2.8-3.2, temperature reaches into vacuum and promptly moves into the vacuum-treat zone after requiring;
(3), the whole LF stove treatment time is controlled at 60-80 min;
Vacuum-treat for the second time requires:
(1), vacuum processing time is controlled at 15 min;
(2), the ladle argon-blown flow control of vacuum-treat stage is at 500Nl/min;
(3), this time in stage is controlled at 35-45 min;
Vacuum-treat is carried out weak Argon after finishing on vacuum apparatus:
(1), weak argon blowing rate is controlled at 100-300Nl/min;
(2), weak argon blowing time is controlled at 14-16 min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110403479.XA CN102443679B (en) | 2011-12-07 | 2011-12-07 | A kind of production method of ultralow oxide inclusion steel |
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| CN201110403479.XA CN102443679B (en) | 2011-12-07 | 2011-12-07 | A kind of production method of ultralow oxide inclusion steel |
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| CN102443679B CN102443679B (en) | 2016-03-30 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102766727A (en) * | 2012-07-03 | 2012-11-07 | 南京钢铁股份有限公司 | Refining deoxidation process for effectively reducing titanium content of tire cord steel |
| CN103924030A (en) * | 2014-04-09 | 2014-07-16 | 中国科学院金属研究所 | Smelting method of ultra-low oxygen pure steel |
| CN104060053A (en) * | 2013-10-24 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Low alloy steel production method |
| CN106435084A (en) * | 2016-11-26 | 2017-02-22 | 湖南华菱湘潭钢铁有限公司 | Smelting method of ultralow-oxygen and medium-high-carbon steel |
| CN108300940A (en) * | 2018-01-31 | 2018-07-20 | 日照钢铁控股集团有限公司 | A kind of sheet blank continuous casting low cost high-mouldability low-carbon al-killed clean steel process |
| CN108950130A (en) * | 2018-07-27 | 2018-12-07 | 北京科技大学 | A kind of mass production smelting process of low oxygen and high purity steel |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111424204B (en) * | 2018-01-31 | 2021-03-19 | 日照钢铁控股集团有限公司 | Production process of calcium-treatment-free low-carbon silicon-containing killed clean steel |
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| CN1676621A (en) * | 2004-03-30 | 2005-10-05 | 宝山钢铁股份有限公司 | Suboxide steel production method |
| CN101633974A (en) * | 2009-08-18 | 2010-01-27 | 武汉钢铁(集团)公司 | Smelting process of ultra low oxygen steel |
| CN102061351A (en) * | 2010-12-21 | 2011-05-18 | 南阳汉冶特钢有限公司 | Method for producing low-carbon steel and ultra-low-carbon steel by VD, LF and VD processes |
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2011
- 2011-12-07 CN CN201110403479.XA patent/CN102443679B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1676621A (en) * | 2004-03-30 | 2005-10-05 | 宝山钢铁股份有限公司 | Suboxide steel production method |
| CN101633974A (en) * | 2009-08-18 | 2010-01-27 | 武汉钢铁(集团)公司 | Smelting process of ultra low oxygen steel |
| CN102061351A (en) * | 2010-12-21 | 2011-05-18 | 南阳汉冶特钢有限公司 | Method for producing low-carbon steel and ultra-low-carbon steel by VD, LF and VD processes |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102766727A (en) * | 2012-07-03 | 2012-11-07 | 南京钢铁股份有限公司 | Refining deoxidation process for effectively reducing titanium content of tire cord steel |
| CN102766727B (en) * | 2012-07-03 | 2013-10-30 | 南京钢铁股份有限公司 | Refining deoxidation process for effectively reducing titanium content of tire cord steel |
| CN104060053A (en) * | 2013-10-24 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Low alloy steel production method |
| CN104060053B (en) * | 2013-10-24 | 2016-02-03 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of producing low alloy steel |
| CN103924030A (en) * | 2014-04-09 | 2014-07-16 | 中国科学院金属研究所 | Smelting method of ultra-low oxygen pure steel |
| CN103924030B (en) * | 2014-04-09 | 2015-05-06 | 中国科学院金属研究所 | Smelting method of ultra-low oxygen pure steel |
| CN106435084A (en) * | 2016-11-26 | 2017-02-22 | 湖南华菱湘潭钢铁有限公司 | Smelting method of ultralow-oxygen and medium-high-carbon steel |
| CN108300940A (en) * | 2018-01-31 | 2018-07-20 | 日照钢铁控股集团有限公司 | A kind of sheet blank continuous casting low cost high-mouldability low-carbon al-killed clean steel process |
| CN108950130A (en) * | 2018-07-27 | 2018-12-07 | 北京科技大学 | A kind of mass production smelting process of low oxygen and high purity steel |
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| CN102443679B (en) | 2016-03-30 |
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