CN102965471A - Method for carrying out deep dephosphorization on molten steel in external refining process - Google Patents
Method for carrying out deep dephosphorization on molten steel in external refining process Download PDFInfo
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- CN102965471A CN102965471A CN2011102573593A CN201110257359A CN102965471A CN 102965471 A CN102965471 A CN 102965471A CN 2011102573593 A CN2011102573593 A CN 2011102573593A CN 201110257359 A CN201110257359 A CN 201110257359A CN 102965471 A CN102965471 A CN 102965471A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 70
- 239000010959 steel Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000007670 refining Methods 0.000 title claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 27
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 26
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 20
- 239000011574 phosphorus Substances 0.000 claims abstract description 20
- 238000010079 rubber tapping Methods 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 19
- 238000003723 Smelting Methods 0.000 claims abstract description 15
- 229910052786 argon Inorganic materials 0.000 claims abstract description 13
- 238000005261 decarburization Methods 0.000 claims abstract description 10
- 238000005275 alloying Methods 0.000 claims abstract description 7
- 238000009835 boiling Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 230000004048 modification Effects 0.000 claims description 12
- 238000012986 modification Methods 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 238000004886 process control Methods 0.000 claims description 4
- 229910001096 P alloy Inorganic materials 0.000 abstract description 3
- 230000009977 dual effect Effects 0.000 abstract 1
- 239000003607 modifier Substances 0.000 abstract 1
- 239000002436 steel type Substances 0.000 abstract 1
- 230000001502 supplementing effect Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 229910052742 iron Inorganic materials 0.000 description 5
- 241001062472 Stokellia anisodon Species 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- DPTATFGPDCLUTF-UHFFFAOYSA-N phosphanylidyneiron Chemical compound [Fe]#P DPTATFGPDCLUTF-UHFFFAOYSA-N 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a method for carrying out deep dephosphorization of molten steel in an external refining process, which comprises the steps of carrying out boiling tapping in a converter process, adding a dephosphorization agent in the tapping process, carrying out strong stirring in an argon station, carrying out LF-RH dual process treatment in the refining process, supplementing the dephosphorization agent in the LF process, carrying out strong stirring at the same time, carrying out heating treatment on the molten steel according to the steel type requirement, adding a modifier in the RH process after the decarburization is finished, and carrying out deoxidation and alloying. The invention can realize low-temperature steel tapping of the converter, reduce steel changing or remelting treatment accidents under the condition that the phosphorus content at the end point of the converter procedure exceeds the standard, and obviously improve the success rate of smelting the ultra-low phosphorus steel; under the condition that the phosphorus content of the discharged steel of the converter is less than or equal to 0.020 percent, the phosphorus in the molten steel can be removed to 30 multiplied by 10 when the LF furnace is moved out-6If the low-phosphorus alloy is used for alloying, the low-phosphorus alloy steel can control the finished phosphorus to be 60 multiplied by 10-6The following.
Description
Technical field
The invention belongs to the process for making field, carry out the method for molten steel deep dephosphorization when being specifically related to a kind of low phosphorus steel by smelting kind in the external refining operation.
Background technology
The operational path of general low phosphorus steel by smelting kind is: at first adopting molten iron " three take off " is deoxidation, decarburization and dephosphorization; Then duplex or double-slag operation are adopted in converter, be smelted into molten steel after, at the RH(vacuum degassing furnace) process, arrive afterwards casting machine main city continuously cast bloom.Whole smelting process at first relies on molten iron " three take off ", and the molten iron phosphorus content is reduced to certain limit, adopts the top and bottom combined blown converter smelting dephosphorization again, then arrives refining RH and processes.The method does not have the dephosphorization measure at whole refining procedure, and the task of dephosphorization mainly relies on hot metal pretreatment and converter operation to finish.
For the steelworks that can't carry out molten iron duplex technique, smelt ultra-low phosphoretic steel and just seem very difficult.And the two slag meltings of employing molten iron also can be so that the converter smelting cycle be elongated, and the while recovery rate of iron also maintains lower level, especially a smelting endpoint and only phosphorus can be taken off between the 0.006-0.012%, can't realize ultralow phosphatization.
Because above-mentioned dephosphorizing method mainly relies on converter to carry out, if in case the phosphorus content of converter operation terminal point exceeds standard, and then refining procedure can't be saved at all, can only change steel or melt down processing, causes greatly financial loss.
Summary of the invention
The present invention aims to provide and a kind ofly can realize deep dephosphorization to molten steel at refining procedure, thereby avoids changing steel or melting down accident owing to what phosphorus content exceeded standard and causes, improves the method for the external refining operation molten steel deep dephosphorization of ultra-low phosphoretic steel smelting success ratio.
For this reason, the technical solution taked of the present invention is:
A kind ofly carry out the method for molten steel deep dephosphorization in the external refining operation, its concrete grammar and control process are:
The converter operation: adopt cold melt, tapping temperature 〉=1620 ℃, smelting endpoint by weight percentage: control phosphorus content≤0.020%, oxygen level 〉=0.060%; Adopt the boiling tapping, not deoxidation, the ratio in steel adding 5-15kg/t steel per ton in the tapping process adds dephosphorizing agent; And tapping process control ladle upper clearance height enters the argon station and adopts strong argon gas to stir stirring intensity＞50Nm at 400-800mm
3/ h, churning time is controlled at 3-8min according to liquid steel temperature;
LF(is ladle refining furnace) operation: strong mixing dephosphorization at first, churning time is controlled at 5-15 min according to liquid steel dephosphorization amount needs; Add dephosphorizing agent according to the needs of dephosphorization amount again, ton steel add-on is controlled at the 1-8kg/t steel; Simultaneously, carry out molten steel heating according to the steel grade temperature requirement, increasing extent of temperature control principle is for guaranteeing that follow-up molten steel is skimmed and the RH treating processes is not carried out the secondary adjustment of temperature; After the LF processing finishes, when possessing molten steel and skimming condition, carry out molten steel and skim, then drop into the high alkalinity molten steel covering agent and cover whole molten steel face; Not carrying out directly being transferred to the RH operation when molten steel is skimmed carries out;
The RH operation: at first carry out decarburization, degassed processing, add modification agent after decarburization finishes, take off slag operation if carried out molten steel after the LF processing finishes, then steel modification agent add-on per ton is controlled at 1-5 kg/t steel; Otherwise the modification agent add-on is controlled at the 3-8kg/t steel; After adding modification agent, more than the circulation 5min, then carry out deoxidation alloying according to oxygen level.
The weight percent content of CaO and FeO is in the described dephosphorizing agent: CaO 40-70%; FeO 15-45%.
The weight percent content of CaO and Al is in the described modification agent: CaO 55-85%; Al 5-15%.
Beneficial effect of the present invention is:
1, adopts the method for molten steel deep dephosphorization of the present invention, can significantly improve the success ratio that ultra-low phosphoretic steel is smelted;
2, converter can realize cold melt, and tapping temperature is minimum only to be 1620 ℃;
3, can in the situation that converter operation end phosphorus content exceeds standard, effectively process by the present invention, change steel or melt down the processing accident thereby reduce;
4, under the condition of converter tapping phosphorus content≤0.020%, by implementing the present invention, the phosphorus in the time of the LF stove can being taken out of in the molten steel takes off to 30 * 10
-6Below; If adopt low phosphorus alloy to carry out alloying, then the controlled finished product phosphorus of low alloy steel is 60 * 10
-6Below.
Embodiment
Take 180 tons of converter smelting IF steel as example, below each chemical ingredients percentage ratio all be weight percentage.
Its finished product chemical ingredients weight percent content requires:
| C（%） | Si（%） | Mn（%） | P（%） | Als（%） | Ti（%） |
| ≤0.0030 | ≤0.030 | 0.10-0.20 | ≤0.008 | 0.03-0.05 | 0.05-0.10 |
Embodiment 1:
1, converter adopts single slag process to smelt, 1625 ℃ of smelting endpoint temperature, and phosphorus content is controlled at 0.018%, oxygen level 0.080%, the boiling tapping, not deoxidation adds the dephosphorizing agent 2500kg that contains CaO 60%, FeO 20% in the tapping process.Tapping process control ladle upper clearance height is at 500mm.
2, entering the argon station adopts strong argon gas to stir stirring intensity 55Nm
3/ h, churning time is controlled at 5min according to liquid steel temperature.
3, carrying out LF processes: at first stir dephosphorization 5 min, stirring intensity 40Nm
3/ h.Then add dephosphorizing agent 200kg, improve stirring intensity to 50Nm
3/ h, restir 5 min.Simultaneously, carry out little argon gas warming temperature, stirring intensity is 15Nm
3/ h heats up twice altogether, and total heating-up time is 20 min.
4, enter RH after the LF stove heats up and finishes and process, at first carry out Decarburization Operation, decarburization time 20 min; Then add modification agent 1000 kg that contain CaO 70%, Al 10%; Behind the circulation 5.5min, carry out deoxidation alloying.
Carry out technological operation control according to embodiment 1, the changing conditions of phosphorus content is in its molten steel:
| Smelting endpoint | In the ladle | Take out of at the argon station | The LF stove is taken out of | RH takes out of | Finished product |
| 0.018% | 0.014% | 0.0084% | 0.0022% | 0.0036% | 0.0038% |
Embodiment 2:
1, converter adopts single slag process to smelt, 1647 ℃ of smelting endpoint temperature, and phosphorus content is controlled at 0.019%, oxygen level 0.10%, the boiling tapping, not deoxidation adds the dephosphorizing agent 2000kg that contains CaO 55%, FeO 15% in the tapping process.Tapping process control ladle upper clearance height is at 700mm.
2, entering the argon station adopts strong argon gas to stir stirring intensity 55Nm
3/ h stirs and is 6min.
3, advance the LF stove, at first stir dephosphorization 5 min, stirring intensity 40Nm
3/ h.Add again dephosphorizing agent 200kg, improve stirring intensity to 50Nm
3/ h, restir 7min.Then carry out little argon gas warming temperature, stirring intensity is 15Nm
3/ h heats up twice altogether, and total heating-up time is 20 min.The LF processing is carried out molten steel and is skimmed after finishing, and thoroughly rear high alkalinity insulating covering agent 200 kg that drop into that skim cover whole molten steel face.
4, the LF stove heats up and finishes laggard RH processing, at first carries out Decarburization Operation, decarburization time 20 min; Then add modification agent 300 kg that contain CaO 60%, Al 15%; Behind the circulation 6min, carry out deoxidation alloying.
Carry out technological operation control according to embodiment 2, the changing conditions of phosphorus content is in its molten steel:
| Smelting endpoint | In the ladle | Take out of at the argon station | The LF stove is taken out of | RH takes out of | Finished product |
| 0.019% | 0.013% | 0.0063% | 0.0018% | 0.0028% | 0.0032% |
Claims (3)
1. one kind is carried out the method for molten steel deep dephosphorization in the external refining operation, it is characterized in that:
The converter operation: adopt cold melt, tapping temperature 〉=1620 ℃, smelting endpoint by weight percentage: control phosphorus content≤0.020%, oxygen level 〉=0.060%; Adopt the boiling tapping, not deoxidation, the ratio in steel adding 5-15kg/t steel per ton in the tapping process adds dephosphorizing agent; And tapping process control ladle upper clearance height enters the argon station and adopts strong argon gas to stir stirring intensity＞50Nm at 400-800mm
3/ h, churning time is controlled at 3-8min according to liquid steel temperature;
The LF operation: at first carry out the strong mixing dephosphorization, churning time is controlled at 5-15 min according to liquid steel dephosphorization amount needs; Add dephosphorizing agent according to the needs of dephosphorization amount again, ton steel add-on is controlled at the 1-8kg/t steel; Simultaneously, carry out molten steel heating according to the steel grade temperature requirement, increasing extent of temperature control principle is for guaranteeing that follow-up molten steel is skimmed and the RH treating processes is not carried out the secondary adjustment of temperature; After the LF processing finishes, when possessing molten steel and skimming condition, carry out molten steel and skim, then drop into the high alkalinity molten steel covering agent and cover whole molten steel face; Not carrying out directly being transferred to the RH operation when molten steel is skimmed carries out;
The RH operation: at first carry out decarburization, degassed processing, add modification agent after decarburization finishes, take off slag operation if carried out molten steel after the LF processing finishes, then steel modification agent add-on per ton is controlled at 1-5 kg/t steel; Otherwise the modification agent add-on is controlled at the 3-8kg/t steel; After adding modification agent, more than the circulation 5min, then carry out deoxidation alloying according to oxygen level.
2. according to claim 1ly carry out the method for molten steel deep dephosphorization in the external refining operation, it is characterized in that the weight percent content of CaO and FeO is in the described dephosphorizing agent: CaO 40-70%; FeO 15-45%.
3. according to claim 1ly carry out the method for molten steel deep dephosphorization in the external refining operation, it is characterized in that the weight percent content of CaO and Al is in the described modification agent: CaO 55-85%; Al 5-15%.
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| CN2011102573593A CN102965471A (en) | 2011-09-02 | 2011-09-02 | Method for carrying out deep dephosphorization on molten steel in external refining process |
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| CN2011102573593A CN102965471A (en) | 2011-09-02 | 2011-09-02 | Method for carrying out deep dephosphorization on molten steel in external refining process |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103255264A (en) * | 2013-06-07 | 2013-08-21 | 鞍钢股份有限公司 | Method for dephosphorizing by using LF refining furnace |
| CN103938069A (en) * | 2014-03-19 | 2014-07-23 | 唐山国丰钢铁有限公司 | LF refining dephosphorization production process for low-phosphorus low-carbon steel |
| CN104561434A (en) * | 2014-12-31 | 2015-04-29 | 南阳汉冶特钢有限公司 | Low-phosphorus steel smelting process |
| CN105483311A (en) * | 2016-01-04 | 2016-04-13 | 河北钢铁股份有限公司邯郸分公司 | Method for smelting IF steel by hyperphosphate molten iron |
| CN105624366A (en) * | 2014-12-01 | 2016-06-01 | 鞍钢股份有限公司 | Method for producing ultralow-phosphorus and ultralow-sulfur steel by LF (ladle furnace) duplex process |
| CN106011363A (en) * | 2016-07-04 | 2016-10-12 | 湖南华菱湘潭钢铁有限公司 | Method for producing ultralow-phosphorous steel |
| CN106702069A (en) * | 2015-11-17 | 2017-05-24 | 鞍钢股份有限公司 | Production method of low-phosphorus low-sulfur ultra-low-carbon steel |
| CN107604120A (en) * | 2017-09-12 | 2018-01-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-phosphorous low-sulfur method for making steel |
| CN107723415A (en) * | 2017-10-31 | 2018-02-23 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of the ultralow phosphorus ultra-low-carbon steel of super-low sulfur |
| CN109402323A (en) * | 2018-11-12 | 2019-03-01 | 包头钢铁（集团）有限责任公司 | A kind of method of superelevation phosphorus molten iron smelting ultra-low phosphoretic steel |
| CN109778054A (en) * | 2019-01-14 | 2019-05-21 | 包头钢铁（集团）有限责任公司 | A kind of process using high phosphorus hot metal production ultra-low phosphoretic steel |
| CN112195309A (en) * | 2020-08-26 | 2021-01-08 | 鞍钢集团工程技术有限公司 | LF furnace smelting process with deep dephosphorization function |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103255264A (en) * | 2013-06-07 | 2013-08-21 | 鞍钢股份有限公司 | Method for dephosphorizing by using LF refining furnace |
| CN103938069A (en) * | 2014-03-19 | 2014-07-23 | 唐山国丰钢铁有限公司 | LF refining dephosphorization production process for low-phosphorus low-carbon steel |
| CN105624366A (en) * | 2014-12-01 | 2016-06-01 | 鞍钢股份有限公司 | Method for producing ultralow-phosphorus and ultralow-sulfur steel by LF (ladle furnace) duplex process |
| CN104561434A (en) * | 2014-12-31 | 2015-04-29 | 南阳汉冶特钢有限公司 | Low-phosphorus steel smelting process |
| CN106702069A (en) * | 2015-11-17 | 2017-05-24 | 鞍钢股份有限公司 | Production method of low-phosphorus low-sulfur ultra-low-carbon steel |
| CN105483311A (en) * | 2016-01-04 | 2016-04-13 | 河北钢铁股份有限公司邯郸分公司 | Method for smelting IF steel by hyperphosphate molten iron |
| CN106011363A (en) * | 2016-07-04 | 2016-10-12 | 湖南华菱湘潭钢铁有限公司 | Method for producing ultralow-phosphorous steel |
| CN107604120A (en) * | 2017-09-12 | 2018-01-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-phosphorous low-sulfur method for making steel |
| CN107723415A (en) * | 2017-10-31 | 2018-02-23 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of the ultralow phosphorus ultra-low-carbon steel of super-low sulfur |
| CN109402323A (en) * | 2018-11-12 | 2019-03-01 | 包头钢铁（集团）有限责任公司 | A kind of method of superelevation phosphorus molten iron smelting ultra-low phosphoretic steel |
| CN109778054A (en) * | 2019-01-14 | 2019-05-21 | 包头钢铁（集团）有限责任公司 | A kind of process using high phosphorus hot metal production ultra-low phosphoretic steel |
| CN112195309A (en) * | 2020-08-26 | 2021-01-08 | 鞍钢集团工程技术有限公司 | LF furnace smelting process with deep dephosphorization function |
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Application publication date: 20130313 |