CN106319147A - LF furnace desulphurization carbon-control nitrogen-protection controlling method - Google Patents
LF furnace desulphurization carbon-control nitrogen-protection controlling method Download PDFInfo
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Abstract
The invention relates to a LF furnace desulphurization carbon-control nitrogen-protection controlling method. The controlling method comprises the following steps: 1) pull-in molten steel is observed, a rapid temperature thermocouple is used for temperature measurement and sampling is carried out, 2) after slugging the molten steel in the step 1), under condition that the slag amount is insufficient, and the fluidity is good, the molten steel is easily exposed, an electrode is brushed, at the same time, desulfurized lime and a high-aluminum deoxidizer submerged arc material are continuously added, 3) when the molten steel temperature is increased to 1590-1600 DEG C, the surface of the molten steel is covered by a layer of protection slag, then submerged-arc heating is carried out, the deoxidation depth is controlled, white residues are generated and deep desulphurization is performed, submerged arc heating is carried out for carbon protection, the nitrogen is controlled; and 4) the dedusting opening degree is adjusted at 20-40% for stabilizing the micro-positive pressure in the furnace, the micro-positive pressure atmosphere in the furnace is guaranteed during a whole processing course of a LF furnace, according to the practical status of ladle permeability, and the argon flow at each phase is set in a reasonable mode.
Description
Technical field
The present invention relates to a kind of desulfurization control carbon and protect nitrogen control method, especially a kind of LF stove desulfurization control carbon is protected nitrogen control method, is belonged to metallurgical technology field.
Background technology
LF stove (LADLE FURNACE) i.e. ladle refining furnace, is external refining equipment main during iron and steel produces.LF stove refers generally to the refining furnace in steel industry.Steel mill produces such as high-grade pipe line steel series such as X70 at present, it is necessary to have the requirement that super-low sulfur is [S]≤0.002%, nitrogen low-phosphorous, low is [N]≤50ppm and low-carbon (LC) is [C]≤0.05% simultaneously.Reduce S element in molten steel, be effectively improved anti-hydrogen induced cracking (HIC) performance of steel low-temperature impact toughness and steel.Actual LF stove refining process is long because of heat time heating time, desulphurizing ability is not enough, the average treatment cycle was at 68 minutes, cause process molten steel process carburetting, nitrogen pick-up serious, sweetening process control ability is unstable, and molten steel S composition cannot take off to less than 0.002%, has a strong impact on production stable, the molten steel quality of production is caused to change steel, degradation.In order to solve this technical problem, those skilled in the art is also constantly attempting, but presently used method is the most relatively costly, and is difficult to the effective content controlling sulfur, and therefore, a kind of new scheme of exigence solves this technical problem.
Summary of the invention
The present invention is just for technical problem present in prior art, a kind of LF stove desulfurization control carbon is provided to protect nitrogen control method, by controlling LF stove morningization slag, make white slag, control deoxidation opportunity, stable heat up, ensure that molten steel is in reducing atmosphere, under high alkalinity refine white slag state, reach molten steel desulfurizing and control carburetting, nitrogen increased amount purpose simultaneously.
To achieve these goals, technical scheme is as follows, plants LF stove desulfurization control carbon and protects nitrogen control method, it is characterised in that described control method comprises the following steps；1) observe the molten steel that enters the station, utilize quick temperature measurementThermocoupleCarry out thermometric and sample, recording inlet temperature typically at 1560 ~ 1590 DEG C；Insert molten steel thickness measuring with burning oxygen pipe, burn the place of slagging scorification on oxygen pipe and start to a length of slag starting fusing thick.The uninterrupted of argon it is blown into according to thickness of slag layer, adjustment ladle, when the thickness of slag layer that molten steel enters the station is less than 50mm, color is shinny, and slag blanket has good mobility；When slag thickness is between 50 ~ l5Omm, slag blanket is a bit darkish in color, and bits are harder, and slag blanket mobility is general；Slag thickness is more than l5Omm, and bits are black, and slag blanket even crusts almost without mobility；Thickness of slag layer is when below 50mm, and argon flow amount controls 50～80L/ minute, uses strong mixing when slag blanket is more than 150mm, selects strong mixing argon to blow break layer, when slag blanket then crusts seriously more than 150mm, uses 7～9 grades of voltages 4～5 grades of electric current long arc morningization slags；
2), in step 1 after molten steel slag, the quantity of slag is not enough, the preferable situation of mobility, molten steel is the most exposed, wash away electrode, be now continuously added into desulfurization Calx, high aluminium deoxidizer submerged arc material, once add Calx 3～5.5Kg/t. steel, it is simultaneously introduced 200kg height aluminium deoxidizer, ladle bits are played modification, the effect of pre-deoxidation, ensure again submerged arc effect, using high pressure low current quickly to heat, average minute clock intensification 2.5 DEG C～5 DEG C also reduces the frequency opening the sampling of fire door thermometric simultaneously；
3) when liquid steel temperature rises between 1590 DEG C～1600 DEG C, molten steel surface has covered one layer of covering slag can carry out submerged arc heating, controls the deoxidation degree of depth, makes the deep desulfurization of white slag, and submerged arc heating is protected carbon, controlled nitrogen.When deoxidation, in order to accelerate desulphurization reaction, add ferrosilicon according to molten steel containing 0.15% silicon, calculating formula:, promote silicon to react with oxygen, form SiO2Accelerate the carrying out of desulphurization reaction；
4) dedusting aperture pressure-fired in 20%～40% stablize stove is adjusted, adjust argon flow amount stage by stage, LF stove processes whole process and ensures pressure-fired atmosphere in stove, LF bell is preferably minimized position, control suitable dedusting aperture 20%～40%, simultaneously according to the actual state of permeability of ladle, the argon flow amount in reasonable set each stage.
As a modification of the present invention, described step 1) is selected strong mixing argon, sets two-way flow and blow break as 400～500L/ minute；After blowing break layer, rapid adjustment two-way flow to 50～80L/ minute, molten steel selects long arc to heat after entering to add thermal potential immediately, fast slag, and the change slag time controlled within 5～7 minutes.
As a modification of the present invention, described step 2) it is brought rapidly up, now molten steel not deoxidation completely, 11～13 grades of voltages 5～6 grades of electric current high pressure low currents are used to heat rapidly according to the liquid steel temperature that enters the station, use and once heat and reduce the frequency opening the sampling of fire door thermometric, average increasing extent of temperature is 2.5 DEG C～3 DEG C, is brought rapidly up by molten steel between 1590～1600 DEG C of temperature.
As a modification of the present invention, deoxidation severity control in described step 3), feed aluminum steel and be adjusted, accurately control Al in steeltAs follows in middle limit Al=0.03%, the Al addition computing formula of target zone:
For accelerating the ferrosilicon amount that the carrying out of desulphurization reaction disposably adds, its computing formula is as follows:
Slagging situation according to molten steel surface adds Calx 3～5.5Kg/t. steel, then carry out submerged arc with 6 grades of electric currents of 11 grades of voltages and add transconversion into heat slag intensification 8 minutes, increase aluminium deoxidizer the most in two batches, every crowd of 100kg, take slag specimen, if black: i.e. (FeO+MnO) >=2% in slag, need the further deoxidation and reduction of killing；Slag is Lycoperdon polymorphum Vitt or brown: i.e. (FeO+MnO)=1～2% in slag, and bits remain a need for reduction；Bits are (FeO+MnO) in white or yellow i.e. slag < 1%, and bits reduction preferably, has started to desulfurization, and meeting efflorescence after solidification, slag is clear glass dregs: this is due to SiO in slag2、Al2O3Content is high, should add Calx regulation, and after waiting bits fusing, resampling is observed；Bits are thick and put down: this bits are the most preferable, can be brittle after cooling, if the most brittle, Al in slag are described2O3Content is high, can affect desulfurization, should add Calx 1.5 Kg/t. steel；Bits are thick and coarse: Calx is too many, is not completely melt, should add some slag accelerator, and a secondary amounts is less than 200 Kg, and after fusing, resampling is observed.Through 2 ~ 3 slag making desulfurization, can produce white slag, LF stove slag making desulfurization degree can reach 82%, and in molten steel, sulfur content processes through deep desulfurization in 15 minutes, controls within 17ppm.
As a modification of the present invention, in step 4), dedusting aperture controls, between 20%～40%, to have remained that flue dust is emerged, it is ensured that reducing atmosphere.
As a modification of the present invention, in described step 4), during heated by electrodes argon set amount with molten steel face steadily, flow keep the bright circle in molten steel face as 300mm, under the conditions of the normal bag condition of good air permeability, heated by electrodes process argon sets flow 80～150L/ minute, pay close attention to top of the slag situation in stove, prevent the excessive excessive slag of bottom blowing from burning out ladle bottom blowing flexible pipe, heat the complete strong mixing carrying out three minutes, increase slag contact area and Reactive Collisions probability, reacting fully and carry out, now argon sets flow 150～200L/ minute；Before last heating terminates molten steel departures, carry out soft blow 5 minutes, argon setting flow 50～100L/ minute.Pay close attention to molten steel face situation during soft blow, adjust argon amount in time, prevent the exposed suction in molten steel face nitrogen.
Relative to prior art, the invention have the advantages that, 1) whole Technical Design is ingenious, in step 1, in molten steel, once add Calx 3～5.5Kg/t. steel, be simultaneously introduced 200kg height aluminium deoxidizer, ladle bits are played modification, the effect of pre-deoxidation, improving basicity, oxidisability reduces, and plays morningization slag, pre-deoxidation, the effect of pre-desulfurization；2) this technical scheme uses high pressure low current to heat rapidly and reduce the frequency opening the sampling of fire door thermometric, improve heat temperature raising efficiency, reducing electrode and steel contacts time, average increasing extent of temperature is 2.5 DEG C～3 DEG C, can be brought rapidly up by molten steel rapidly between 1590 DEG C～1600 DEG C of temperature；3) this technical scheme enters the station composition silicone content according to molten steel, carries out silicon alloy fine setting by silicon lower limit 0.15%, promotes silicon to react with oxygen, and [Si]+2 (FeO)=2 [Fe]+
(SiO2), silicon can reduce the activity of sulfur, additionally SiO2Energy promotion slag, slagging, reduction viscosity, increase slag contact area, accelerates the carrying out of desulphurization reaction；4) LF stove processes omnidistance by pressure-fired atmosphere in control suitable dedusting aperture guarantee stove, it is ensured that reducing atmosphere, the most beneficially desulfurization, prevents again nitrogen pick-up.
Detailed description of the invention:
In order to deepen the understanding of the present invention, below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment
1
:
Manufacturing directive number 270872 steel grade JU6716A6 processes total cycle 52min, inlet temperature 1611 DEG C, [C]=0.0314%, [S]=0.006% at 250 tons of LF stoves；Bottom blowing of entering the station out sets flow 300L/min, observes bottom blowing respond well, adds Calx 3.8kg/t. steel, is simultaneously introduced 200kg height aluminium deoxidizer for slag deoxidation；Using 6 grades of electric currents of 11 grades of voltage to carry out submerged arc and add transconversion into heat slag intensification about 8 minutes, bits are yellow, and thermometric determines oxygen, testing temperature 1592 DEG C, oxygen amount 358ppm, feeds Al line, carry out deoxidation of molten steel process, and in control steel, Alt is at the middle limit Al of target zonet=0.03%, and add 520kg Antaciron and add 180kg height aluminium deoxidizer, 3.5 Kg/t. steel Calx, heat 15min, stop heating setpoint flow 180 L/ minute, 3min bottom blowing stirring, close bottom blowing.Thermometric takes process sample [C]=0.034%, [S=0.0037% (does not does carbon sulfur), rejoin 1.0 Kg/t. steel Calx, 100kg high alumina slag, heat 9 minutes thermometrics 1644 DEG C, [C]=0.04%, [S]=0.0009%, [N]=0.0032% meets steel grade departures and requires to stop Argon, departures.
Embodiment
2
:
Manufacturing directive number 517801, steel grade IV5810B2, process time 56min, pure process cycle 31.3min at LF stove；Steel grade enters the station composition [C]=0.0265%, [S]=0.0055%, and enter the station bottom blowing flow 500L/min, thickness of slag layer 210mm, during process select short arc heating, heat time heating time 5min, thermometric inlet temperature 1557 DEG C, determining oxygen 648ppm, temperature is relatively low, add 2.5 Kg/t. steel Calx use 6 grades of electric currents of 12 grades of voltage carry out submerged arc heating be rapidly heated, heat time heating time 11min, thermometric 1601 DEG C, now feeds aluminum steel, adjusts Al in steelt, it is simultaneously introduced 530kg Antaciron, add 3.5 Kg/t. steel Calx, 100kg high alumina slag carries out the deep desulfurization of 8min and processes, observe slag condition, become white slag, improve argon flow amount to 180 L/ minute, stirring 3min increases steel grade contact area and carries out desulfurization, again add 200kg high alumina slag, reheat 5min, heat up by 3.5 DEG C/min, desulfurization heats up further, weak stirring 3min, out-station temperature 1620 DEG C, composition [C]=0.0294%, [S]=0.0012%, finished product [N]=0.0034%. desulfurization degree reaches 78.2%, carbon increasing amount 29ppm, stop Argon, departures.Ensure that LF processing procedure is stable, reach the effect of good desulfurization.
Normal process example
1
:
Manufacturing directive number 321811, steel grade IV5810B2, process time 68min, pure process cycle 46.4min at LF stove；Steel grade enters the station composition [C]=0.0215%, [S]=0.0058%, and enter the station bottom blowing flow 400L/min, thickness of slag layer 220mm, selecting short arc heating during process, 3min, surveyed inlet temperature 1560 DEG C, determined oxygen 513ppm heat time heating time, temperature is relatively low, and skull melts the most completely, continues heating 5min.Add Calx 3.9Kg/t. steel, add 100kg high alumina slag, uses 6 grades of electric currents of 10 grades of voltage to carry out heat temperature raising, heat time heating time 10min, thermometric 1583 DEG C, the now the highest aluminum steel that i.e. feeds of temperature, Al in adjustment steeltnullAdd and reach 0.043%，Add Calx 3.5 Kg/t. steel，100kg high alumina slag carries out the deep desulfurization of 8min and processes，Observe slag condition，Bits turn black，Bits poor fluidity，Adjust argon flow amount to 270L/ minute，Add 250kg high alumina slag，Continue heating 8min，Thermometric 1610 DEG C，Become at the beginning of white slag，Liquid level seethes bigger，Adjust argon flow amount to 150 L/ minute，Add Calx 2.5Kg/t. steel，Again add 150kg high alumina slag，Continue heating 10min，Thermometric samples，Temperature 1631 DEG C，Further heat 5min，Thermometric samples，Open weak stirring 5min，Out-station temperature 1641 DEG C，Composition [C]=0.042%，[S]=0.0019%，Departures [N]=0.0054% exceeds standard and does not conforms to.
Embodiment 1,2 is smelted and departures C, S, the synopsis of N content in normal process, as shown in table 1:
In table 1, embodiment consumes with normal smelting process slag material and contrast situation, as shown in table 2:
The embodiment of the present invention 1,2, compared to normal process, its advantage is mainly reflected in vertical LF slag material consumption and reduces, wherein desulfurization Calx reduces 3.07kg/t steel, every stove high alumina slag consumption reduces 150kg, slag situation of overflowing heating process is effectively controlled, avoid bottom blowing three mitron scaling loss, guarantee equipment safety and production stability, by contrast it can be seen that high-grade pipe line steel is once smelt rate significantly promotes, carbon increasing amount reduces by 0.01485%, within nitrogen increased amount controls 10ppm, reducing 8ppm than normal process, desulfurization degree rises 13.14%.The new technology shortening duration of heat, is reduced to 54min from original stove average 68min mono-stove, the situation that inlet temperature is high, it might even be possible to reaches 50min departures, is effectively controlled the content of C, N, S departures, reduce the production cycle, improves production efficiency.
It should be noted that above-described embodiment, be not used for limiting protection scope of the present invention, equivalents done on the basis of technique scheme or replacement each fall within the scope that the claims in the present invention are protected.
Claims (6)
1. a LF stove desulfurization control carbon protects nitrogen control method, it is characterised in that described control method comprises the following steps；1) observe the molten steel that enters the station, utilize quick temperature measurementThermocoupleCarry out thermometric and sample, recording inlet temperature typically at 1560 ~ 1590 DEG C；Molten steel thickness measuring is inserted with burning oxygen pipe, burn the place of slagging scorification on oxygen pipe and start to a length of slag starting fusing thick, be blown into the uninterrupted of argon according to thickness of slag layer, adjustment ladle, when the thickness of slag layer that molten steel enters the station is less than 50mm, color is shinny, and slag blanket has good mobility；When slag thickness is between 50 ~ l5Omm, slag blanket is a bit darkish in color, and bits are harder, and slag blanket mobility is general；Slag thickness is more than l5Omm, and bits are black, and slag blanket does not has mobility or crust；Thickness of slag layer is normal Argon when below 50mm, argon flow amount controls 50～80L/ minute, uses strong mixing when slag blanket is at 50 ~ 150mm, selects strong mixing argon to blow break layer, when slag blanket then crusts seriously more than 150mm, use 7～9 grades of voltages 4～5 grades of electric current long arc morningization slags；
2), in step 1 after molten steel slag, the quantity of slag is not enough, the preferable situation of mobility, molten steel is the most exposed, wash away electrode, be now continuously added into desulfurization Calx, high aluminium deoxidizer submerged arc material, once add Calx 3～5.5Kg/t. steel, it is simultaneously introduced 200kg height aluminium deoxidizer, ladle bits are played modification, the effect of pre-deoxidation, ensure again submerged arc effect, using high pressure low current quickly to heat, average minute clock intensification 2.5 DEG C～5 DEG C also reduces the frequency opening the sampling of fire door thermometric simultaneously；
3) when liquid steel temperature rises between 1590 DEG C～1600 DEG C, molten steel surface has covered one layer of covering slag can carry out submerged arc heating, controls the deoxidation degree of depth, makes the deep desulfurization of white slag, and submerged arc heating is protected carbon, controlled nitrogen；
When deoxidation, in order to accelerate desulphurization reaction, add ferrosilicon according to molten steel containing 0.15% silicon, calculating formula:
, promote silicon to react with oxygen, form SiO2Accelerate the carrying out of desulphurization reaction；
4) dedusting aperture pressure-fired in 20%～40% stablize stove is adjusted, LF stove processes whole process and ensures pressure-fired atmosphere in stove, and LF bell is preferably minimized position, controls suitable dedusting aperture 20%～40%, simultaneously according to the actual state of permeability of ladle, the argon flow amount in reasonable set each stage.
LF stove desulfurization control carbon the most according to claim 1 protects nitrogen control method, it is characterised in that selects strong mixing argon in described step 1), sets two-way flow and blow break as 400～500L/ minute；After blowing break layer, rapid adjustment two-way flow to 50～80L/ minute, molten steel selects long arc to heat after entering to add thermal potential immediately, fast slag, and the change slag time controlled within 5～7 minutes.
LF stove desulfurization control carbon the most according to claim 2 protects nitrogen control method, it is characterized in that, described step 2) it is brought rapidly up, now molten steel not deoxidation completely, 11～13 grades of voltages 5～6 grades of electric current high pressure low currents are used to heat rapidly according to the liquid steel temperature that enters the station, using and once heat and reduce the frequency opening the sampling of fire door thermometric, average increasing extent of temperature is 2.5 DEG C～5 DEG C, is brought rapidly up by molten steel between 1590～1600 DEG C of temperature.
LF stove desulfurization control carbon the most according to claim 3 protects nitrogen control method, it is characterised in that deoxidation severity control in described step 3), feeds aluminum steel and is adjusted, and accurately controls Al in steeltAs follows in middle limit Al=0.03%, the Al addition computing formula of target zone:
For accelerating the ferrosilicon amount that the carrying out of desulphurization reaction disposably adds, its computing formula is as follows:
Slagging situation according to molten steel surface adds Calx 3～5.5Kg/t. steel, then carry out submerged arc with 6 grades of electric currents of 11 grades of voltages and add transconversion into heat slag intensification 8 minutes, increase aluminium deoxidizer the most in two batches, every crowd of 100kg, take slag specimen, if black: i.e. (FeO+MnO) >=2% in slag, need the further deoxidation and reduction of killing；Slag is Lycoperdon polymorphum Vitt or brown: i.e. (FeO+MnO)=1～2% in slag, and bits remain a need for reduction；Bits are (FeO+MnO) in white or yellow i.e. slag < 1%, and bits reduction preferably, has started to desulfurization, and meeting efflorescence after solidification, slag is clear glass dregs: this is due to SiO in slag2、Al2O3Content is high, should add Calx regulation, and after waiting bits fusing, resampling is observed；Bits are thick and put down: this bits are the most preferable, can be brittle after cooling, if the most brittle, Al in slag are described2O3Content is high, can affect desulfurization, should add Calx 1.5 Kg/t. steel；Bits are thick and coarse: Calx is too many, is not completely melt, should add some slag accelerator, and a secondary amounts is less than 200 Kg, and after fusing, resampling is observed；
Through 2 ~ 3 slag making desulfurization, can produce white slag, LF stove slag making desulfurization degree can reach 82%, and in molten steel, sulfur content processes through deep desulfurization in 15 minutes, controls within 17ppm.
LF stove desulfurization control carbon the most according to claim 4 protects nitrogen control method, it is characterised in that in step 4), dedusting aperture controls, between 20%～40%, to have remained that flue dust is emerged, it is ensured that reducing atmosphere.
LF stove desulfurization control carbon the most according to claim 4 protects nitrogen control method, it is characterized in that, in described step 4), during heated by electrodes, argon set amount is steady with molten steel face, flow keeps the bright circle in molten steel face to be 300mm, under the conditions of the normal bag condition of good air permeability, heated by electrodes process argon sets flow 80～150L/ minute, pay close attention to top of the slag situation in stove, prevent the excessive excessive slag of bottom blowing from burning out ladle bottom blowing flexible pipe, heat the complete strong mixing carrying out three minutes, increase slag contact area and Reactive Collisions probability, react fully and carry out, now argon sets flow 150～200L/ minute；Before last heating terminates molten steel departures, carry out soft blow 5 minutes, argon setting flow 50～100L/ minute.
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| CN114657323A (en) * | 2022-03-21 | 2022-06-24 | 阳春新钢铁有限责任公司 | Deep desulfurization method for LF (ladle furnace) |
| CN114672615A (en) * | 2022-04-20 | 2022-06-28 | 广东韶钢松山股份有限公司 | Deoxidation method of low-carbon drawn steel Q195LB |
| CN115679041A (en) * | 2022-11-02 | 2023-02-03 | 包头钢铁（集团）有限责任公司 | Rapid smelting method of low-carbon aluminum-free deoxidizing low-sulfur steel |
| CN115679041B (en) * | 2022-11-02 | 2024-01-19 | 包头钢铁（集团）有限责任公司 | Rapid smelting method of low-carbon aluminum-free deoxidized low-sulfur steel |
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