CN102787202A - Method for controlling nitrogen content of low-nitrogen steel - Google Patents
Method for controlling nitrogen content of low-nitrogen steel Download PDFInfo
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- CN102787202A CN102787202A CN2011104034728A CN201110403472A CN102787202A CN 102787202 A CN102787202 A CN 102787202A CN 2011104034728 A CN2011104034728 A CN 2011104034728A CN 201110403472 A CN201110403472 A CN 201110403472A CN 102787202 A CN102787202 A CN 102787202A
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- argon
- tapping
- controlled
- nitrogen content
- carbon
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 22
- 239000010959 steel Substances 0.000 title claims abstract description 22
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 56
- 229910052786 argon Inorganic materials 0.000 claims abstract description 28
- 238000010079 rubber tapping Methods 0.000 claims abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 229910052742 iron Inorganic materials 0.000 claims abstract description 9
- 238000007664 blowing Methods 0.000 claims abstract description 8
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 5
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 5
- 239000000956 alloy Substances 0.000 claims abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000001301 oxygen Substances 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 239000010703 silicon Substances 0.000 claims abstract description 5
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical class ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 claims description 5
- 239000003517 fume Substances 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 abstract description 7
- 230000015556 catabolic process Effects 0.000 abstract description 4
- 238000006731 degradation reaction Methods 0.000 abstract description 4
- 238000007670 refining Methods 0.000 abstract description 4
- 206010039897 Sedation Diseases 0.000 abstract 1
- 238000009749 continuous casting Methods 0.000 abstract 1
- 230000036280 sedation Effects 0.000 abstract 1
- 239000000779 smoke Substances 0.000 abstract 1
- 238000009489 vacuum treatment Methods 0.000 abstract 1
- 238000005266 casting Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000004260 weight control Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 108090000237 interleukin-24 Proteins 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention provides a method for controlling nitrogen content of low-nitrogen steel, which comprises the following steps of adopting high molten iron and low scrap ratio in the converter smelting process, wherein the tapping temperature is not lower than 1700 ℃, silicon is added into ferrosilicon to 0.4%, a smoke hood is lowered in the whole oxygen blowing period, and argon is blown in the whole bottom blowing process; high-carbon-pulling with the carbon weight of 0.05-0.07% is adopted for tapping, and the tapping is carried out by carbon-pulling at one time, and argon is not blown in the tapping process and an argon station; in the RH refining process, the argon flow is controlled to be 150Nl/h from the beginning of vacuumizing, the deep vacuum treatment time is controlled to be 8-12min, and the sedation time is 7-9min after the alloy is added; and the continuous casting adopts argon protection pouring. The nitrogen content of the sample of the argon station is controlled to be 0.0011-0.0013%, the nitrogen content of the sample taken out after RH treatment is finished is controlled to be 0.0013-0.0015%, and the nitrogen content of the finished product sample is controlled to be 0.0016-0.0020%, so that degradation and steel change accidents caused by the fact that the nitrogen content of the finished product is not enough are thoroughly eliminated.
Description
Technical field
The invention belongs to the smelting technology field, relate in particular to the method for a kind of converter-RH (vacuum degassing furnace) explained hereafter finished product weight nitroxide degree (hereinafter to be referred as weight) less than 0.0030% steel grade.
Background technology
At present, there is the part steel grade that the composition range of nitrogen in the finished product has been proposed specific requirement, promptly requires weight nitroxide in the finished product≤0.0030%; For adopting top and bottom combined blown converter-RH production technique, owing to compare with the IF steel (ultra low-carbon steel) of other reasons through the RH depths, the chemical ingredients scope of the finished product nitrogen of this steel grade is narrower; Therefore when producing this type of steel grade,, will cause nitrogen pick-up phenomenon in smelting and the tapping process if do not take special process control nitrogen; Thereby cause the ultra scope of nitrogen component in the finished product; Degradation often occurs or change the steel accident, directly influenced the quality product qualification rate, cause great financial loss to enterprise.
Summary of the invention
The object of the present invention is to provide and a kind ofly can effectively control the nitrogen content in the smelting process, prevent nitrogen pick-up, thereby improve the quality qualification rate, reduce degradation or change the method for the converter-qualified low nitrogen steel of RH explained hereafter of steel accident.
For this reason, the technical solution that the present invention taked is:
A kind of method of controlling the low nitrogen steel nitrogen content is characterized in that, the weight nitroxide that manufactures a finished product less than the concrete grammar of 0.0030% steel grade is:
(1), top and bottom combined blown converter control:
A, converter Intake Quantity adopt high molten iron, low scrap ratio, and tapping temperature is not less than 1700 ℃;
Si weight adopted ferrosilicon to join silicon to 0.4% less than 0.4% o'clock in b, the molten iron;
Revolving furnace fume hood falls in whole process during c, the oxygen blast, the omnidistance Argon of bottom blowing;
The high catch carbon of carbon weight at 0.05-0.07% adopted in d, tapping, a catch carbon tapping, and tapping process and argon station be Argon not;
(2), RH control:
A, argon flow amount begin to be controlled at 140-150Nl/h from vacuumizing;
B, dark vacuum processing time are controlled at 8-12min;
Behind c, the adding alloy, the calm time is 7-9 min.
Beneficial effect of the present invention is:
Because the present invention has taked above-mentioned measure in converter smelting, RH refining and casting process, efficiently solve nitrogen pick-up problem in the steel, has guaranteed that the finished product weight nitroxide is controlled at less than in 0.0030% scope.Through production inspection; The stable 0.0011-0.0013% that is controlled at of its argon station appearance nitrogen content; The RH processing finishes the back extraction and takes out of the appearance analysis, and nitrogen content is controlled at 0.0013-0.0015%, and finished product appearance is analyzed nitrogen content and is controlled between the 0.0016-0.0020%; Reach standard-required fully, thereby thoroughly eliminated owing to the finished product nitrogen component does not conform to the degradation that causes and changes the steel accident.
Embodiment
Embodiment 1:
Adopt 260 tons of top and bottom combined blown converters, 260 tons of RH stoves are produced the ST16 steel grade.
1, top and bottom combined blown converter control:
A, converter Intake Quantity adopt high molten iron, low scrap ratio, and adding amount of scrap steel is 25 tons, 1750 ℃ of tapping temperatures.
Si weight is 0.3% in b, the actual measurement molten iron, and the adding ferrosilicon is joined silicon to Si weight and reached 0.4%.
Petticoat pipe falls in whole process during c, the oxygen blast, the omnidistance Argon of bottom blowing.
D, converter tapping adopt high catch carbon, and the carbon weight control is tapped at 0.06%, catch carbon, avoids over-blowing.And tapping process and get into the argon station after Argon no longer.
2, RH control:
A, lifting argon flow amount, argon flow amount is controlled at 150Nl/h from vacuumizing beginning always, to strengthen the eliminating of nitrogen between carbon period.
B, prolong dark vacuum processing time, dark vacuum processing time is extended to 12min.
Behind c, the adding alloy, the calm time is controlled at 8min.
Continue Argon in the casting process, adopt argon for protecting pouring.
All the other converter smeltings, RH refining and casting process all adopt common process.
Embodiment 2:
Adopt 260 tons of top and bottom combined blown converters, 260 tons of RH stoves are produced the M3A35 steel.
1, top and bottom combined blown converter control:
A, converter Intake Quantity adopt high molten iron, low scrap ratio, 20 tons of adding amount of scrap steel, 1740 ℃ of tapping temperatures.
Si weight is 0.25% in b, the actual measurement molten iron, and the adding ferrosilicon is joined silicon to Si weight and reached 0.4%.
Petticoat pipe falls in whole process during c, the oxygen blast, the omnidistance Argon of bottom blowing.
D, converter tapping adopt high catch carbon, and the carbon weight control is tapped at 0.07%, catch carbon, avoids over-blowing.In the tapping process and get into behind the argon station no longer Argon.
2, RH control:
A, argon flow amount are controlled at 150Nl/h from vacuumizing beginning always, to strengthen the eliminating of nitrogen between carbon period.
B, prolong dark vacuum processing time, dark vacuum processing time is extended to 9min.
Behind c, the adding alloy, the calm time is controlled at 9min.
Continue Argon in the casting process, adopt argon for protecting pouring.
All the other converter smeltings, RH refining and casting process all adopt common process.
Claims (1)
1. a method of controlling the low nitrogen steel nitrogen content is characterized in that, the weight nitroxide that manufactures a finished product less than the concrete grammar of 0.0030% steel grade is:
(1), top and bottom combined blown converter control:
A, converter Intake Quantity adopt high molten iron, low scrap ratio, and tapping temperature is not less than 1700 ℃;
Si weight adopted ferrosilicon to join silicon to 0.4% less than 0.4% o'clock in b, the molten iron;
Revolving furnace fume hood falls in whole process during c, the oxygen blast, the omnidistance Argon of bottom blowing;
The high catch carbon of carbon weight at 0.05-0.07% adopted in d, tapping, a catch carbon tapping, and tapping process and argon station be Argon not;
(2), RH control:
A, argon flow amount begin to be controlled at 140-150Nl/h from vacuumizing;
B, dark vacuum processing time are controlled at 8-12min;
Behind c, the adding alloy, the calm time is 7-9 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104034728A CN102787202A (en) | 2011-12-07 | 2011-12-07 | Method for controlling nitrogen content of low-nitrogen steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104034728A CN102787202A (en) | 2011-12-07 | 2011-12-07 | Method for controlling nitrogen content of low-nitrogen steel |
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| Publication Number | Publication Date |
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| CN102787202A true CN102787202A (en) | 2012-11-21 |
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| CN2011104034728A Pending CN102787202A (en) | 2011-12-07 | 2011-12-07 | Method for controlling nitrogen content of low-nitrogen steel |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103468851A (en) * | 2013-08-15 | 2013-12-25 | 首钢京唐钢铁联合有限责任公司 | Nitrogen control method of converter under converter less slag smelting mode |
| CN103627841A (en) * | 2013-11-01 | 2014-03-12 | 南京钢铁股份有限公司 | Control method for nitrogen content of molten steel of wear-resistant steel |
| CN103993132A (en) * | 2014-05-30 | 2014-08-20 | 河北钢铁股份有限公司 | Method for refining low-nitrogen steel by ladle refining furnace (LF) |
| CN104278129A (en) * | 2014-09-29 | 2015-01-14 | 宁夏共享铸钢有限公司 | Denitrification method in steel ingot smelting |
| CN104404197A (en) * | 2014-12-04 | 2015-03-11 | 北京首钢股份有限公司 | Method for reducing molten steel nitrogen in steelmaking link |
| CN107974528A (en) * | 2017-11-16 | 2018-05-01 | 北京首钢股份有限公司 | A kind of method for reducing converter terminal nitrogen content of molten steel |
| CN111593161A (en) * | 2020-06-17 | 2020-08-28 | 武汉钢铁有限公司 | Smelting method of ultralow-nitrogen low-alloy steel |
| CN111944955A (en) * | 2020-08-27 | 2020-11-17 | 湖南华菱涟源钢铁有限公司 | RH vacuum refining method |
| CN113435114A (en) * | 2021-06-23 | 2021-09-24 | 马鞍山钢铁股份有限公司 | Method for accurately controlling nitrogen content of CV-RH-CC process path steel |
| CN113652511A (en) * | 2021-07-16 | 2021-11-16 | 武汉钢铁有限公司 | Smelting method for controlling nitrogen content in silicon-aluminum killed steel to be less than or equal to 0.0013% |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101550475A (en) * | 2009-05-15 | 2009-10-07 | 首钢总公司 | Method for producing ultra-low-carbon steel |
| CN101760582A (en) * | 2009-12-30 | 2010-06-30 | 首钢总公司 | Smelting method for controlling content of nitrogen in low-carbon steel |
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2011
- 2011-12-07 CN CN2011104034728A patent/CN102787202A/en active Pending
Patent Citations (2)
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| CN101550475A (en) * | 2009-05-15 | 2009-10-07 | 首钢总公司 | Method for producing ultra-low-carbon steel |
| CN101760582A (en) * | 2009-12-30 | 2010-06-30 | 首钢总公司 | Smelting method for controlling content of nitrogen in low-carbon steel |
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| ***等: "转炉炼钢低氮控制实践", 《第七届（2009）中国钢铁年会论文集》, 31 December 2009 (2009-12-31), pages 379 - 382 * |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103468851A (en) * | 2013-08-15 | 2013-12-25 | 首钢京唐钢铁联合有限责任公司 | Nitrogen control method of converter under converter less slag smelting mode |
| CN103468851B (en) * | 2013-08-15 | 2016-01-13 | 首钢京唐钢铁联合有限责任公司 | Nitrogen control method of converter under converter less slag smelting mode |
| CN103627841A (en) * | 2013-11-01 | 2014-03-12 | 南京钢铁股份有限公司 | Control method for nitrogen content of molten steel of wear-resistant steel |
| CN103993132B (en) * | 2014-05-30 | 2015-09-02 | 河北钢铁股份有限公司 | The method of LF stove smelting low-nitrogen steel |
| CN103993132A (en) * | 2014-05-30 | 2014-08-20 | 河北钢铁股份有限公司 | Method for refining low-nitrogen steel by ladle refining furnace (LF) |
| CN104278129A (en) * | 2014-09-29 | 2015-01-14 | 宁夏共享铸钢有限公司 | Denitrification method in steel ingot smelting |
| CN104404197A (en) * | 2014-12-04 | 2015-03-11 | 北京首钢股份有限公司 | Method for reducing molten steel nitrogen in steelmaking link |
| CN104404197B (en) * | 2014-12-04 | 2016-08-24 | 北京首钢股份有限公司 | The method reducing steel-making link molten steel nitrogen |
| CN107974528A (en) * | 2017-11-16 | 2018-05-01 | 北京首钢股份有限公司 | A kind of method for reducing converter terminal nitrogen content of molten steel |
| CN107974528B (en) * | 2017-11-16 | 2020-09-25 | 北京首钢股份有限公司 | Method for reducing nitrogen content of molten steel at converter end point |
| CN111593161A (en) * | 2020-06-17 | 2020-08-28 | 武汉钢铁有限公司 | Smelting method of ultralow-nitrogen low-alloy steel |
| CN111944955A (en) * | 2020-08-27 | 2020-11-17 | 湖南华菱涟源钢铁有限公司 | RH vacuum refining method |
| CN113435114A (en) * | 2021-06-23 | 2021-09-24 | 马鞍山钢铁股份有限公司 | Method for accurately controlling nitrogen content of CV-RH-CC process path steel |
| CN113435114B (en) * | 2021-06-23 | 2022-11-22 | 马鞍山钢铁股份有限公司 | Method for accurately controlling nitrogen content of steel grade of CV-RH-CC process route |
| CN113652511A (en) * | 2021-07-16 | 2021-11-16 | 武汉钢铁有限公司 | Smelting method for controlling nitrogen content in silicon-aluminum killed steel to be less than or equal to 0.0013% |
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Application publication date: 20121121 |