CN102465229A - Ferro-titanium alloying method for titaniferous stainless steel - Google Patents
Ferro-titanium alloying method for titaniferous stainless steel Download PDFInfo
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- CN102465229A CN102465229A CN2010105454727A CN201010545472A CN102465229A CN 102465229 A CN102465229 A CN 102465229A CN 2010105454727 A CN2010105454727 A CN 2010105454727A CN 201010545472 A CN201010545472 A CN 201010545472A CN 102465229 A CN102465229 A CN 102465229A
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Abstract
The invention relates to a ferro-titanium alloying method for titaniferous stainless steel, which comprises the following steps of: I) after slagging off and AOD (Argon Oxygen Decarburization) tapping, removing slag and keeping the thickness of the remained slag being not more than 50mm; II) making a slag steel bag again and hanging in an LF (Low Frequency) finery, adding lime and fluorite for making the slag again, blowing argon from bottom and powerfully stirring and slagging or electrifying and slagging; III) deoxidizing, adding aluminum powder in surface slag, keeping total bottom blowing flow being 600-1,000Nl/min, and stirring for 3-5min; IV) before discharging molten steel, starting to feed a silico-calcium line, and then softly stirring; and V) adding ferro-titanium for alloying, keeping the bottom blowing argon flow close to the side of a feeding port being 500-700 Nl/min and the one away from the side of the feeding port being 100-200Nl/min, adding 2.5-3.5kg ferro-titanium in a ton of molten steel, keeping the bottom blowing flow being 200-300 Nl/min per piece and stirring, and then adjusting the total flow of bottom blowing double-tube being not more than 200NL/min, and softly stirring. According to the ferro-titanium alloying method for titaniferous stainless steel, the titanium-feeding time is short and a crystallizer water port is prevented from being plugged during a continuous casting process.
Description
Technical field
The present invention relates to a kind of titaniferous stainless steel ferro-titanium method.
Background technology
Applicant's second steelworks is after in September, 2006, stainless steel production line was gone into operation, and the output of steel grades such as titaniferous stainless steel 321,316Ti, 409L increases, and in the LF stove, adopts the mode of feeding titanium wire carry out titanium alloyization; Because the big titanium wire of feeding that needs of molten steel amount is more, the time that takies is long, has a strong impact on the normal production order; Adopt the ferrotianium DIRECT ALLOYING; The molten steel purity is bad, causes problems such as the continuous cast mold mouth of a river is stifled, crystallizer protecting residue crust, the carrying out that influence is produced.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing titaniferous stainless steel ferro-titanium method, the present invention provides a kind of titaniferous stainless steel ferro-titanium method of feeding titanium wire time weak point and avoiding the obstruction of titaniferous stainless steel continuous casting process mold gap.
Design of the present invention is that the tapping back removes the strong oxidizing property slag earlier, adds the slag making again of lime, fluorite then again, and then through adding aluminium powder slag and molten steel is carried out sufficient deoxidation, the Al of feeding silicon-calcium wire to generating before adding ferrotianium
2O
3Carry out deformation process, add ferrotianium then at the bottom blowing flow of adjusting ladle and carry out alloying.
This titaniferous stainless steel ferro-titanium method comprises following sequential steps:
I skims
Remove the slag in the ladle after the AOD tapping, the thickness of residue slag amount is not more than 50mm;
II is slag making again
Ladle is hung in the LF refining furnace; After arriving at a station, LF refining furnace (molten steel) adds lime and fluorite slag making again; Add-on is respectively molten steel 2.5-5.0kg lime per ton, 1.70-3.50kg fluorite; Lime, fluorite add the back and adopt the BOTTOM ARGON BLOWING strong mixing, and two bottom blowpipes, the flow of each bottom blowpipe (each bottom blowing pipeline) are the 650750Nl/minization slag or adopt electrode to send electrochemical slag;
The III deoxidation
Slag fusing back adds aluminium powder at the top of the slag; Add-on is a 0.50-1.50kg/ ton steel; Aluminium powder adds the two-tube summation of bottom blowing flow of back ladle and sets 600-1000Nl/min stirring 3-5min; Guarantee that aluminium powder melts fully, reduce the weak stirring of argon blowing rate, total wind drift amount of two bottom blowpipes is 80-200Nl/min.Guarantee that the aluminium content (quality) in the molten steel is not less than 0.03%, be generally 0.03%-0.05%, well (dissolved oxygen content is not more than 3ppm in the steel, FeO+MnO+Cr in the slag for molten steel, slag deoxidation
2O
3≤1.0%).
IV feeds silicon-calcium wire
Before molten steel departures, begin to feed 2-4 rice/ton molten steel silicon-calcium wire during 25-35min, silicon-calcium wire feeding back reduces argon blowing rate, and two bottom blowing pipeline total fluxs are adjusted to and are not more than 200Nl/min, soft stirring 3-5min, general a little less than the stirring flow be 60-200Nl/min;
V adds ferro-titaniumization
Contact with slag for fear of the ferrotianium adition process; Adjusting to the BOTTOM ARGON BLOWING flow near one of reinforced oral-lateral before ferrotianium adds is 500-700Nl/min; Adjust to 100-200Nl/min for one away from reinforced oral-lateral, add ferrotianium from high hopper, add-on is molten steel 2.5-3.5kg per ton; After ferrotianium adds the bottom blowing flow is adjusted into every bottom blowing 200-300Nl/min and stirs 2-4min; Guarantee that the two-tube total flux of the complete and even back adjustment bottom blowing of ferrotianium fusing is not more than the soft stirring of 200Nl/min 10-15min, is generally 100-200Nl/min, end treatment.
This titaniferous stainless steel ferro-titanium method improves the receipts of ferrotianium and hangs down rate the tap to tap time of having reduced the LF stove, has solved the incrustive problem of obstruction, crystallizer protecting residue at the continuous cast mold mouth of a river.The titanium alloy time has been reduced to less than 3min by the 8-10min that feeds titanium wire, and the ferrotianium yield is brought up to 70%-80% by 40%-50%, has solved obstruction, the incrustive problem of the mold top of the slag of titaniferous stainless steel continuous casting process mold gap.
Embodiment
Specify the embodiment of this titaniferous stainless steel ferro-titanium method below in conjunction with embodiment, but the embodiment of this titaniferous stainless steel ferro-titanium method is not limited to following embodiment.
Embodiment one
The steel grade that present embodiment is smelted is 321 (0Cr18Ni10Ti), and the capacity of LF refining furnace is 180 tons, handles 175 tons on molten steel, and two bottom blowpipes are arranged, the slag thick 50mm of molten steel behind the LF refining furnace, and the quality per distribution ratio of the composition of this steel grade is in the GB standard:
C≤0.08； Si≤1.00； Mn≤2.00； Cr 17.00-19.00；
Ni 9.00-12.00； Ti≥5C； P≤0.035； S≤0.030。
The applicant controls to the quality per distribution ratio of the composition of this steel grade:
C≤0.04； Si 0.40-0.70； Mn 0.80-1.50； Cr 17.00-18.00；
Ni 9.00-9.50； Ti 5C-0.25； P≤0.035； S≤0.010。
All the other are Fe and unavoidable impurities.
The embodiment of this titaniferous stainless steel ferro-titanium method is a following sequential steps:
I skims
After the AOD tapping, 01:00:00 removes the slag in the ladle, and the thickness of residue slag amount is 50mm;
II is slag making again
Ladle is hung in the LF refining furnace, and after LF refining furnace (molten steel) arrived at a station, 01:21:16 molten steel per ton added lime 4.58kg and fluorite 2.57kg slag making again, and lime, fluorite add the back and adopt the BOTTOM ARGON BLOWING strong mixing, and the flow of every bottom blowpipe is the 700Nl/minization slag; (on the time; 01:15:00 stirs with regard to Argon before adding lime, fluorite)
The III deoxidation
01:22:17 slag fusing back adds aluminium powder 120kg at the top of the slag; The flow of every bottom blowpipe of ladle still is 700Nl/min in the aluminium powder adition process; Strong mixing 5min is to 01:31:43 again; Guarantee that aluminium powder melts fully, reduce the weak stirring of argon blowing rate, total wind drift amount of two bottom blowpipes is 100Nl/min.Aluminium content (quality) in the molten steel is 0.03%.
IV feeds silicon-calcium wire
Present embodiment divides once feeds silicon-calcium wire, 20min before the molten steel departures, i.e. 02:49:38 feeding silicon-calcium wire 700m keeps weak stirring in the process of feeding silicon-calcium wire, two bottom blowpipe total fluxs are 100Nl/min, a little less than be stirred to 02:54:00;
V adds ferro-titaniumization
Contact with slag for fear of the ferrotianium adition process; Adjusting to the BOTTOM ARGON BLOWING flow near one of reinforced oral-lateral before ferrotianium adds is 700Nl/min; Adjust to 100Nl/min for one away from reinforced oral-lateral, 02:56:48 adds ferrotianium 578kg from high hopper, after ferrotianium adds; 02:59:00 adjusts to every bottom blowing 200Nl/min with above-mentioned BOTTOM ARGON BLOWING flow and stirs 3min to 03:02:00; After guaranteeing that the ferrotianium fusing is complete and even, adjust two bottom blowing pipeline total fluxs to the soft stirring of 100Nl/min 15min, end treatment.Present embodiment ferrotianium yield is 70%.
(smelt and finish back or casting) after adding ferro-titaniumization, the quality per distribution ratio of the branch of molten steel is:
C 0.02； Si 0.50； Mn1.20； Cr 17.2； Ni 9.20； Ti 0.15；
P 0.032； S 0.002；
All the other are Fe and unavoidable impurities.
Embodiment two
The steel grade that present embodiment is smelted is 316Ti, and the capacity of LF refining furnace is 180 tons, handles 179 tons on molten steel, and two bottom blowpipes are arranged, the slag thick 50mm of molten steel behind the LF refining furnace, and the quality per distribution ratio of the composition of this steel grade is in the ASTM standard:
C≤0.08； Si≤0.75； Mn≤2.00； Cr 16.50-18.50；
Ni 10.50-13.50； Ti≥5×C+N)-0.70； P≤0.045； S≤0.015。
The applicant controls to the quality per distribution ratio of the composition of this steel grade:
C≤0.04； Si 0.30-0.70； Mn 0.80-1.50； Cr 16.50-17.00；
Ni 10.50-11.00； Ti 5×C+N)； P≤0.045 S≤0.010 N≤0.020
All the other are Fe and unavoidable impurities.
The embodiment of this titaniferous stainless steel ferro-titanium method is a following sequential steps:
I skims
After the AOD tapping, 03:20:00 removes the slag in the ladle, and the thickness of residue slag amount is 50mm;
II is slag making again
Ladle is hung in the LF refining furnace, and after LF refining furnace (molten steel) arrived at a station, 03:46:16 added molten steel per ton and adds lime 2.77kg and fluorite 1.93kg slag making again, and lime, fluorite add the back and adopt the BOTTOM ARGON BLOWING strong mixing, and the flow of every bottom blowpipe is the 700Nl/minization slag; (on the time; 03:35:00 stirs with regard to Argon before adding lime, fluorite)
The III deoxidation
03:56:08 slag fusing back adds aluminium powder 200kg at the top of the slag; The bottom blowing flow of every bottom blowpipe of ladle still is 700Nl/min in the aluminium powder adition process, and strong mixing 5min guarantees that to 04:03:03 aluminium powder melts fully again; Aluminium content (quality) in the molten steel is 0.05%; Molten steel, slag deoxidation are good, reduce that argon blowing rate is weak to be stirred, and two bottom blowpipe total fluxs are 100Nl/min.
IV feeds silicon-calcium wire
Present embodiment divides once feeds silicon-calcium wire, 20min before the molten steel departures, i.e. 04:45:27 feeding silicon-calcium wire 712m keeps weak stirring in the process of feeding silicon-calcium wire, two bottom blowpipe total fluxs are 100Nl/min, a little less than be stirred to 04:48:03;
V adds ferro-titaniumization
Contact with slag for fear of the ferrotianium adition process; Adjusting to the BOTTOM ARGON BLOWING flow near one of reinforced oral-lateral before ferrotianium adds is 700Nl/min; Adjust to 100N1/min for one away from reinforced oral-lateral; 04:48:44 adds ferrotianium 682kg from high hopper, and after ferrotianium added, 04:50:03 adjusted to every bottom blowing 200Nl/min with above-mentioned BOTTOM ARGON BLOWING flow and stirs 3min to 04:53:48; Guarantee that adjustment bottom blowing 2 bottom blowpipe total fluxs in the complete and even back of ferrotianium fusing are to the soft stirring of 100Nl/min 15min, end treatment.Present embodiment ferrotianium yield is 76.9%.
(smelt and finish back or casting) after adding ferro-titaniumization, the quality per distribution ratio of the branch of molten steel is:
C 0.02； Si 0.40； Mn 0.92； Cr 16.80； Ni 10.60； Ti 0.20；
P 0.040; S 0.002; N 0.015; All the other are Fe and unavoidable impurities.
All the other are Fe and unavoidable impurities.
Embodiment three
The steel grade that present embodiment is smelted is 409L, and the capacity of LF refining furnace is 180 tons, handles 170.2 tons on molten steel, and two bottom blowpipes are arranged, the slag thick 50mm of molten steel behind the LF refining furnace, and the quality per distribution ratio of the composition of this steel grade is in the JIS standard:
C≤0.03； Si≤1.00；Mn≤1.00； Cr 10.50-11.75； Ni≤0.60
Ti≥6C-0.75； P≤0.035 S≤0.030； N≤0.030。
The applicant controls to the quality per distribution ratio of the composition of this steel grade:
C≤0.012； Si≤0.75； Mn≤0.80； Cr 11.00-11.75；
Ni≤0.30； Ti 10×C-0.15； P≤0.035 S≤0.010 N≤0.020
Nb 0.15-0.20；
All the other are Fe and unavoidable impurities.
The embodiment of this titaniferous stainless steel ferro-titanium method is a following sequential steps:
I skims
After the AOD tapping, 20:20:00 removes the slag in the ladle, and the thickness of residue slag amount is 50mm;
II is slag making again
Ladle is hung in the LF refining furnace, and after LF refining furnace (molten steel) arrived at a station, 20:47:49 molten steel per ton added lime 4.69kg and fluorite 2.04kg slag making again, and lime, fluorite add the back and adopt the BOTTOM ARGON BLOWING strong mixing, and the flow of strong mixing is a 2 * 700Nl/minization slag; (on the time; 20:38:00 stirs with regard to Argon before adding lime, fluorite)
The III deoxidation
21:03:22 slag fusing back adds aluminium powder 200kg at the top of the slag; The bottom blowing flow of ladle is 2 * 300Nl/min in the aluminium powder adition process, and strong mixing 5min guarantees that to 21:08:55 aluminium powder melts fully again; Aluminium content (quality) in the molten steel is 0.034%; Molten steel, slag deoxidation are good, reduce that argon blowing rate is weak to stir bottom blowing flow 2 * 60Nl/min.
IV feeds silicon-calcium wire
Present embodiment divides once feeds silicon-calcium wire, 30min before the molten steel departures, i.e. 21:25:27 feeding silicon-calcium wire 680m keeps weak stirring in the process of feeding silicon-calcium wire, the bottom blowpipe flow is 2 * 60Nl/min, a little less than be stirred to 21:32:40;
V adds ferro-titaniumization
Contact with slag for fear of the ferrotianium adition process, ferrotianium before adding is adjusted to the BOTTOM ARGON BLOWING flow
Near one of reinforced oral-lateral is 700Nl/min, adjusts to 100Nl/min away from of reinforced oral-lateral,
21:32:55 adds ferrotianium 553kg from high hopper; After ferrotianium adds; 21:35:40 adjusts to every bottom blowing 200Nl/min with above-mentioned BOTTOM ARGON BLOWING flow and stirs 3min to 21:38:55; Guarantee the complete and even back of ferrotianium fusing adjustment bottom blowing flow to the 2 * soft stirring of 80Nl/min 15min, end treatment.Present embodiment ferrotianium yield is 70%.
(smelt and finish back or casting) after adding ferro-titaniumization, the quality per distribution ratio of the branch of molten steel is:
C 0.010； Si 0.60； MN 0.20； Cr 11.25； Ni 0.20；
Ti 0.16； P 0.030； S 0.002； N 0.011； Nb 0.16；
All the other are Fe and unavoidable impurities.
Above-mentioned three embodiment, in Step II slag making again, after the LF refining furnace arrives at a station and adds lime and fluorite, but all electrode send electrochemical slag.
Claims (2)
1. titaniferous stainless steel ferro-titanium method, it comprises following sequential steps:
I skims
Remove the slag in the ladle after the AOD tapping, the thickness of residue slag amount is not more than 50mm;
II is slag making again
Ladle is hung in the LF refining furnace; After arriving at a station, the LF refining furnace adds lime and fluorite slag making again; Add-on is respectively molten steel 2.5-5.0kg lime per ton, 1.70-3.50kg fluorite; Lime, fluorite add the back and adopt the BOTTOM ARGON BLOWING strong mixing, and two bottom blowpipes, the flow of each bottom blowpipe are the 650-750Nl/minization slag or adopt electrode to send electrochemical slag;
The III deoxidation
Slag fusing back adds aluminium powder at the top of the slag; Add-on is a 0.50-1.50kg/ ton steel; Aluminium powder adds the two-tube summation of bottom blowing flow of back ladle and sets 600-1000Nl/min stirring 3-5min, guarantees that aluminium powder melts fully, guarantees that the aluminium content in the molten steel is not less than 0.03%; Dissolved oxygen content is not more than 3ppm in the steel, FeO+MnO+Cr in the slag
2O
3≤1.0%;
IV feeds silicon-calcium wire
Before molten steel departures, begin to feed 2-4 rice/ton molten steel silicon-calcium wire during 25-35min, the silicon-calcium wire feeding is the reduction argon blowing rate afterwards, and two bottom blowing pipeline total fluxs are adjusted to and are not more than 200Nl/min, soft stirring 3-5min;
V adds ferro-titaniumization
Contact with slag for fear of the ferrotianium adition process; Adjusting to the BOTTOM ARGON BLOWING flow near one of reinforced oral-lateral before ferrotianium adds is 500-700Nl/min; Adjust to 100-200Nl/min for one away from reinforced oral-lateral; Add ferrotianium from high hopper, add-on is molten steel 2.5-3.5kg per ton, after ferrotianium adds the bottom blowing flow is adjusted into every bottom blowing 200-300Nl/min and stirs 2-4min; Guarantee that the two-tube total flux of the complete and even back adjustment bottom blowing of ferrotianium fusing is not more than the soft stirring of 200Nl/min 10-15min, end treatment.
2. titaniferous stainless steel ferro-titanium method according to claim 1 is characterized in that: when Step II I deoxidation, after aluminium powder melts fully, reduce the weak stirring of argon blowing rate, total wind drift amount of two bottom blowpipes is 80-130Nl/min.
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| CN103225008A (en) * | 2013-04-22 | 2013-07-31 | 山西太钢不锈钢股份有限公司 | Method for preventing caking in crystallizer and nozzle clogging during process for smelting titanium-containing stainless steel |
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| CN104073594B (en) * | 2014-06-27 | 2016-07-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of core-spun yarn and the titanium alloyed method of molten steel |
| CN104073594A (en) * | 2014-06-27 | 2014-10-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Cored wire and method for titanium alloying of liquid steel |
| CN104073593B (en) * | 2014-06-27 | 2016-05-04 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of core-spun yarn and the titanium alloyed method of molten steel |
| CN104233043A (en) * | 2014-09-29 | 2014-12-24 | 首钢总公司 | Method for smelting high titanium content alloy structure steel |
| CN105331906A (en) * | 2015-12-02 | 2016-02-17 | 广东广青金属科技有限公司 | Long continuous casting control method for titanium-containing austenitic stainless steel |
| CN109848382A (en) * | 2019-01-30 | 2019-06-07 | 凌源钢铁股份有限公司 | A kind of titanium alloyed method in process for making |
| CN109593918A (en) * | 2019-02-12 | 2019-04-09 | 鞍钢股份有限公司 | The ladle and its argon blowing method at bottom of inclusion content in a kind of quick reduction molten steel |
| CN110643783A (en) * | 2019-10-31 | 2020-01-03 | 达力普石油专用管有限公司 | Narrow range control method for Ti content of Ti microalloyed steel |
| CN111206142A (en) * | 2020-03-04 | 2020-05-29 | 湖州盛特隆金属制品有限公司 | Method for smelting titanium-containing stainless steel by using titanium alloy waste |
| CN112941267A (en) * | 2021-01-28 | 2021-06-11 | 重庆钢铁股份有限公司 | Process method for improving titanium alloying in steel |
| CN113699428A (en) * | 2021-07-19 | 2021-11-26 | 北京科技大学 | Ti alloying process for reducing TP321 stainless steel seamless tube layering defect |
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