CN108690900A - Ultra-low carbon aluminum killed steel steel treatment method - Google Patents
Ultra-low carbon aluminum killed steel steel treatment method Download PDFInfo
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- CN108690900A CN108690900A CN201810595416.0A CN201810595416A CN108690900A CN 108690900 A CN108690900 A CN 108690900A CN 201810595416 A CN201810595416 A CN 201810595416A CN 108690900 A CN108690900 A CN 108690900A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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Abstract
The invention discloses a kind of Ultra-low carbon aluminum killed steel steel treatment methods, belong to iron and steel smelting technology field.The present invention is in order to solve existing processing Ultra-low carbon aluminum killed steel molten steel, and hypoxgia or hyperoxia easily occurs in when decarburization, and foreign substance in molten steel is difficult to control, and the poor problem of castability provides a kind of Ultra-low carbon aluminum killed steel steel treatment method comprising:A, lime is added in molten steel tapping process, and slag adjusting agent is added after tapping;B, high alkalinity refining slag is added in the stations molten steel LF, by the outbound preceding oxygen activity controls of LF in 800ppm;C, the outbound addition slag adjusting agent of molten steel RH stand controls molten steel oxygen activity 500ppm~800ppm, RH.The present invention is solved the problems, such as that hypoxgia and hyperoxia when decarburization, stability contorting foreign substance in molten steel state improve RH liquid steel refining processing capacities, is improved pourability of molten steel, ensure continuous cast products quality using suitable control molten steel oxygen activity, slagging process.
Description
Technical field
The invention belongs to iron and steel smelting technology fields, and in particular to a kind of Ultra-low carbon aluminum killed steel steel treatment method.
Background technology
In the plank field of steel, cold rolling class complex deformation part, such as zero for refrigerator, TV, car panel etc.
Part, these part requirement loss of weight lightweights, need certain intensity and deformation is complicated.To meet performance requirement, such steel grade
Universal composition design feature be Ultra-low carbon, low silicon, the aluminum killed steel containing manganese, general basic ingredient Fan Weiwei [C]:
0.0015%-0.0060%, [Si]:0.00%-0.15%, [Mn]0.10%-0.80%, [Als]0.015%-0.08%.
High Al content, extremely low C content in such steel, cause the easy secondary oxidation of molten steel, the castability of molten steel poor.In order to
Reach generally not deoxidation when converter molten steel tapping in 50ppm requirements below, production of such steel C content, in vacuum holdings such as RH
It sets under vacuum state, takes off C naturally using the higher oxygen content in molten steel, this method is that economical rationality is feasible,
It is generally used in production.But from the difference of converter molten steel condition, the mainly difference of oxygen content, give steel secondary refining
Difficulty is brought, liquid steel refining is difficult to accurate stable control, and continuous casting requires liquid steel refining to handle qualified molten steel in given time
It is then more difficult, how to take effective technology to keep process stably and controllable in liquid steel refining link, improves the degree of purity of such steel grade,
It is the important topic of field of steel metallurgy for a long time.To meet the requirement of end user, such steel is not allowed to have in continuous casting
The characteristics of castability problem, steel grade, proposes harsh degree of purity requirement to refining.
Since RH decarburizations are carried out by C-O reactions, contain containing certain oxygen therefore it is required that converter must assure that in molten steel
Amount, and oxygen content height generates strong influence for Molten Steel Cleanliness.Mass production is practice have shown that Oxygen Content in Liquid Steel excessively high one
Aspect can increase the oxidisability of slag, once slag, which enters, can greatly pollute molten steel in ladle;It is remained after another aspect RH decarburizations
Remaining oxygen content needs corresponding aluminium to carry out deoxidation removal, this certainly will just generate a large amount of Al2O3Field trash, if floating is insufficient,
Wadding stream risk can undoubtedly be increased, lead to the problem of continuous irrigatation castability;And the too low needs for being unfavorable for molten steel decarburization of Oxygen Content in Liquid Steel, because
This regulation converter tapping oxygen content needs a rational range.
Currently, solving the degree of purity of this kind of steel, castability, production stability, substantially core work is exactly steel water oxygen
Control;But from there is now in terms of technology, can effective stability contorting slab pre-deoxidation vacuum steel Oxygen Content in Liquid Steel, it is excessively program-controlled with slag
System is combined, to reach the method quickly produced of stabilizing the economy there is not yet report.
Invention content
When handling Ultra-low carbon aluminum killed steel molten steel the technical problem to be solved by the present invention is to the prior art, when decarburization, easily occurs
The problem of hypoxgia or hyperoxia, foreign substance in molten steel are difficult to control, and castability is poor.
There is provided a kind of Ultra-low carbon aluminum killed steel molten steel for technical solution used by the present invention solves above-mentioned technical problem
Processing method comprising following steps:
A, molten steel tapping and stove after argon station operation:Lime is added in molten steel tapping process, and slag adjusting agent, Argon are added after tapping;
B, molten steel LF station operations:Molten steel enters the station into the stations LF Argon and measures liquid steel temperature and oxygen content, and high alkalinity refining is added
Slag, outbound thermometric determine oxygen, by the outbound oxygen activity controls of LF in 800ppm;
C, molten steel RH station operations:Molten steel determines oxygen into the stations RH thermometric, and control molten steel oxygen activity 500ppm~800ppm, VCD is fixed
Oxygen is added aluminum shot and carries out deoxidation, and after carrying out alloy increasing Mn, outbound thermometric, the outbound addition slag adjusting agents of RH are to get Ultra-low carbon al-killed
Steel molten steel.
Wherein, Ultra-low carbon aluminum killed steel steel treatment method described above, in step A, CaOHan Liang > in the lime;
90%.
Wherein, Ultra-low carbon aluminum killed steel steel treatment method described above, in step A, the addition of the lime is
1.5~2.5Kg/t steel.
Wherein, Ultra-low carbon aluminum killed steel steel treatment method described above, in step A, CaO content in the slag adjusting agent
For 42~48%, Al2O3Content is 18~28%, and Al content is 6~8%.
Wherein, Ultra-low carbon aluminum killed steel steel treatment method described above, in step A, the addition of the slag adjusting agent
For 1.5~2.5Kg/t steel.
Wherein, Ultra-low carbon aluminum killed steel steel treatment method described above, when measuring oxygen content in step B, after Argon,
It is higher than the heat of 800ppm for oxygen, oxygen content is adjusted using aluminum shot or aluminum steel, by the outbound oxygen activity control of LF in 800ppm.
Wherein, Ultra-low carbon aluminum killed steel steel treatment method described above, in step B, the aluminum shot or aluminum steel according to
100ppm[ often drops;O]0.15Kg/t steel is added to be controlled;
Preferably, Ultra-low carbon aluminum killed steel steel treatment method described above in step B, is higher than 800ppm for oxygen
Heat, adjustment amount maximum drops oxygen 100ppm, adjusted again after determining oxygen.
Wherein, Ultra-low carbon aluminum killed steel steel treatment method described above, in step B, in the high alkalinity refining slag
CaOHan Liang >70%, CaF2Han Liang >20%;The addition of the high alkalinity refining slag is 1.5~2.5Kg/t steel.
Wherein, Ultra-low carbon aluminum killed steel steel treatment method described above, in step C, molten steel is stood into RH, low for oxygen
In the heat of 500ppm, oxygen blast oxygenation carbon drop operation is carried out, according to every increasing 100ppm[O]It is blown into amount of oxygen 0.12Nm3/ t steel into
Row control.
Preferably, Ultra-low carbon aluminum killed steel steel treatment method described above in step C, is less than 500ppm for oxygen
Heat, an adjustment amount maximum oxygenation 100ppm adjusts again after determining oxygen.
Wherein, Ultra-low carbon aluminum killed steel steel treatment method described above, in step C, what the VCD determined oxygen determines oxygen value
For 250~500ppm.
Wherein, Ultra-low carbon aluminum killed steel steel treatment method described above, in step C, CaO content in the slag adjusting agent
For 42~48%, Al2O3Content is 18~28%, and Al content is 6~8%;The addition of the slag adjusting agent is 2.0~2.5Kg/t
Steel.
The beneficial effects of the invention are as follows:
The method of the present invention is difficult to the problem effectively controlled, reasonable combination steel for sheet billet continuous casting Ultra-low Carbon Molten Steel castability
Slag treatment and natural decarburization, the respective processing feature of deoxidation treatment in crystal's refining, it is comprehensive to find a kind of weak Slag treatment, the control of strong oxygen
The refining pattern of processing finds the degree of association of C-O ingredients, is adopted in smelting molten steel, refining process by analyzing such steel grade feature
With appropriate oxygen activity in suitable control molten steel, the technique of slag making is controlled, that is, solves the problems, such as hypoxgia when decarburization, also controls
The problem of hyperoxia, energy stability contorting foreign substance in molten steel state improve RH liquid steel refining processing capacities, improve such steel grade continuous casting
The castability of molten steel ensures the quality of continuous cast products, has higher economic benefit;The method of the present invention easy controlled operation, processing time
Controllably, the time beat requirement for preferably meeting continuous casting steel direct casting, can be widely used in field of iron and steel smelting, have compared with
Good popularizing application prospect.
Specific implementation mode
Specifically, Ultra-low carbon aluminum killed steel steel treatment method comprising following steps:
A, molten steel tapping and stove after argon station operation:Lime is added in molten steel tapping process, and slag adjusting agent, Argon are added after tapping;
B, molten steel LF station operations:Molten steel enters the station into the stations LF Argon and measures liquid steel temperature and oxygen content, and high alkalinity refining is added
Slag, outbound thermometric determine oxygen, by the outbound oxygen activity controls of LF in 800ppm;
C, molten steel RH station operations:Molten steel determines oxygen into the stations RH thermometric, and control molten steel oxygen activity 500ppm~800ppm, VCD is fixed
Oxygen is added aluminum shot and carries out deoxidation, and after carrying out alloy increasing Mn, outbound thermometric, the outbound addition slag adjusting agents of RH are to get Ultra-low carbon al-killed
Steel molten steel.
The present invention can Slag treatment and natural decarburization, the respective processing feature of deoxidation treatment in reasonable combination liquid steel refining,
It is comprehensive find a kind of weak Slag treatment, strong oxygen control process refining pattern, utilize the relationship of C-O in molten steel to carry out the control of O.
In the method for the present invention, slag making needs to be controlled from tapping to RH is outbound, to change slag type:Molten steel tapping process adds
Enter lime and (1.5~2.5Kg/t steel, CaOHan Liang > is added;90%) (after immediately) is added slag adjusting agent and (is added 1.5 after, tapping
~2.5Kg/t steel, CaO content 42~48%, Al2O3Content is 18~28%, and Al content is 6~8%), so control just furnace
The slag charge that ladle is added when tapping is 3~5Kg/t steel;Then, LF, which enters the station, is added high alkalinity refining slag (1.5~2.5Kg/t of addition
Steel, CaOHan Liang >70%, CaF2Han Liang >20%);Slag adjusting agent is added when RH is outbound and (2.0~2.5Kg/t steel, CaO content is added
42~48%, Al2O3Content is 18~28%, and Al content is 6~8%);The slag charge control that so whole stove is added 6.5~
10Kg/t steel carries out slag making and the adjustment of slag state, so that the slag in ladle is to subsequently using the alundum (Al2O3) generated after aluminium deoxidation to press from both sides
It is miscellaneous that there is good absorption effect.
In step B, molten steel stands into LF and measures liquid steel temperature, when temperature is inadequate, compensates temperature operation and (generally heats 10
~30min), to control out the stations LF temperature as 1635~1660 DEG C, while playing residue adjustment, adjusting the effects that molten steel oxygen.
In the method for the present invention, converter molten steel is tapped in ladle, and tapping process is small flat after stove without deoxidation Operation control
Platform is also without the control of oxygen;The LF operation later stages carry out the adjustment of molten steel oxygen, and oxygen content adjustment is carried out according to oxygen value is determined:For oxygen
Heat less than 450ppm, in RH oxygen blast oxygenation carbon drops;It is higher than the heat of 800ppm for oxygen, the tune of oxygen is carried out using aluminum metal
It is whole, by the outbound oxygen activity controls of LF in 800ppm, according to every drop 100ppm[O]Aluminum amount 0.15Kg/t steel is added to be controlled,
The form that aluminium is added can be that (100ppm[, often drops in such as 130 tons of molten steel for solid metal aluminum shot or aluminum steel;O], aluminum shot is about added
100 meters/stove of 20Kg/ stoves or feeding aluminum steel) deoxidation control is carried out, by the control of molten steel oxygen activity to less than within 800ppm;It is preferred that
, one time oxygen 100ppm drops in adjustment amount maximum, is adjusted again after determining oxygen.
The method of the present invention, the RH molten steel thermometric that enters the station determine oxygen, check molten steel oxygen value, the heat of 500ppm is less than for oxygen, into
Row oxygen blast oxygenation carbon drop operation increases 100ppm oxygen and is equivalent to drop 100ppm carbon, according to every increasing 100ppm[O]It is blown into amount of oxygen
0.12Nm3/ t steel is controlled.Oxygen is just adjusted to 500ppm~800ppm's when in this way, producing this kind of Ultra-low carbon aluminum killed steel
In zone of reasonableness, so that vacuum is produced most important technological parameter oxygen value and obtain controllably, RH processing procedures are compact, steel after VCD decarburizations
Water oxygen activity is moderate (250~500ppm), is Al2O3The control of field trash creates good condition.
Refining treatment terminates, and continuous casting is gone to cast, and oxygen will remove, ability safety and stability production, therefore in step C, aluminium is added
Grain carries out deoxidation, and the addition of aluminum shot can be used this field routine operation and determine, in general the addition Kg/t steel of aluminum shot=
1.8*[O]/1000+10*[Als]-p+0.1;Wherein , [O]Determine oxygen value, unit ppm for VCD;[Als]It is single for RH desired values
Position is %;P is the aluminum amount that other alloys (such as ferrotianium contains aluminium 7% or so) are added and bring into, and (such as IF3 steel grades are added units/kg/t steel
Ferrotianium increases aluminum amount 0.16Kg/t steel, IF7 steel grades are added ferrotianium and increase aluminum amount 0.15Kg/t steel).RH out-station temperatures are generally
1595~1620 DEG C, RH out-station temperatures are mainly adjusted according to the length of casting time.
When being not specifically noted, content of the present invention is mass content.
Below by embodiment, invention is further described in detail, but does not therefore limit the scope of the present invention
Among the embodiment described range.
Embodiment 1:Refine steel grade IF3
The requirement of steel grades rank:<=0.0050%C, <=0.03%%Si, 0.10%~0.25%Mn, 0.02%~
0.07%Als, 0.050%-0.085%Ti;
Steel treatment method:
A, 200Kg lime (CaOHan Liang > is added when tapping for 130.2 tons of molten steel amount;90%) 200kg residue adjustments, are added after tapping
Agent (CaO content 45%, Al2O3Content 21%, Al content 6.5%);
B, when molten steel is to refining LF stoves, 1585 DEG C of thermometric determines oxygen 880ppm (being higher than 800ppm), and enter the station sample examination ingredient
205Kg high alkalinities refining slag (CaO > 70%, CaF is added in 0.027%C2> 20%), 21 minutes heating times, outbound addition
Aluminum shot 20Kg, 1642 DEG C of outbound thermometric, determines oxygen 767ppm;
C, molten steel determines oxygen 751ppm, VCD and determines oxygen 492ppm (after vacuum decarburization), 179kg is added into 1638 DEG C of the thermometric in the stations RH
Aluminum shot carries out deoxidation, and after carrying out alloy increasing Mn, outbound thermometric is 1609 DEG C, the outbound addition 300kg slag adjusting agent (CaO contents of RH
45%, Al2O3Content 21%, Al content 6.5%), the outbound sample examination ingredients of RH:0.0031%C, 0.19%Mn, 0.02%
Si, 0.05%Als;Lower process continuous casting wraps greatly no unsteady flow when casting this stove molten steel, and stopper opening degree increases by 1%, crystallizer
Liquid fluctuating is in ± 2mm, and casting is smooth, and steel treatment effect is good, continuous casting finished product sample examination ingredient:0.0033%C,
0.19%Mn, 0.02%Si, 0.045%Als.
Embodiment 2:Refine steel grade IF7
Steel grades basic demand:<=0.0030%C, <=0.02%%Si, 0.10%-0.25%Mn, 0.02%-
0.06%Als, 0.050%-0.070%Ti, 0.008%-0.020%Nb;
Steel treatment method:
A, 202Kg lime (CaOHan Liang > is added when tapping for 130.7 tons of molten steel amount;90%) 200kg residue adjustments, are added after tapping
Agent (CaO content 45%, Al2O3Content 21%, Al content 6.5%);
B, when molten steel is to refining LF stoves, 1572 DEG C of thermometric determines oxygen 390ppm (being less than 450ppm), and enter the station sample examination ingredient
205Kg high alkalinities refining slag (CaOHan Liang > is added in 0.042%C;70%, CaF2Han Liang >20%), heating time 21 minutes, go out
It stands 1642 DEG C of thermometric, determines oxygen 397ppm;
C, molten steel determines oxygen 375ppm, blowing oxygen quantity 45Nm into 1638 DEG C of the thermometric in the stations RH3, VCD determines oxygen 361ppm, 149kg is added
Aluminum shot carries out deoxidation, and after carrying out alloy increasing Mn, outbound thermometric is 1609 DEG C, the outbound addition 300kg slag adjusting agent (CaO contents of RH
45%, Al2O3Content 21%, Al content 6.5%), the outbound sample examination ingredients of RH:0.0026%C, 0.19%Mn, 0.01%
Si, 0.052%Als;Lower process continuous casting wraps greatly no unsteady flow when casting this stove molten steel, and stopper opening degree increases by 1%, crystallization
Device liquid fluctuating is in ± 2mm, and casting is smooth, and steel treatment effect is good, continuous casting finished product sample examination ingredient:0.0028%C,
0.19%Mn, 0.02%Si, 0.045%Als.
Comparative example 1:Using previous technique refining steel grade IF3
The requirement of steel grades rank:<=0.0050%C, <=0.03%%Si, 0.10%~0.25%Mn, 0.02%~
0.07%Als, 0.050%-0.085%Ti;
Steel treatment method:
A, 800Kg lime (CaOHan Liang > is added when tapping for 130.5 tons of molten steel amount;90%);
B, when molten steel is to refining LF stoves, 1582 DEG C of thermometric determines oxygen 880ppm, and enter the station sample examination ingredient 0.025%C, adds
200kg slag adjusting agents (CaO content 45%, Al was added before outbound in 22 minutes hot time2O3Content 21%, Al content 6.5%);
C, molten steel determines oxygen 887ppm, VCD and determines oxygen 539ppm (after vacuum decarburization), 190kg is added into 1635 DEG C of the thermometric in the stations RH
Aluminum shot carries out deoxidation, and after carrying out alloy increasing Mn, outbound thermometric is 1612 DEG C, the outbound addition 100kg slag adjusting agent (CaO contents of RH
45%, Al2O3Content 21%, Al content 6.5%), the outbound sample examination ingredients of RH:0.0030%C, 0.18%Mn, 0.02%
Si, 0.055%Als;Lower process continuous casting is big to wrap latter stage unsteady flow when casting this stove molten steel, and stopper opening degree increases by 3%, crystallization
Device liquid fluctuating is in ± 3mm, continuous casting finished product sample examination ingredient:0.0032%C, 0.18%Mn, 0.02%Si, 0.041%
Als。
Claims (9)
1. Ultra-low carbon aluminum killed steel steel treatment method, it is characterised in that:Include the following steps:
A, molten steel tapping and stove after argon station operation:Lime is added in molten steel tapping process, and slag adjusting agent, Argon are added after tapping;
B, molten steel LF station operations:Molten steel stands into LF and measures liquid steel temperature and oxygen content, and high alkalinity refining slag is added, and outbound thermometric is fixed
Oxygen, by the outbound oxygen activity controls of LF in 800ppm;
C, molten steel RH station operations:Molten steel determines oxygen into the stations RH thermometric, and control molten steel oxygen activity 500ppm~800ppm, VCD determine oxygen, add
Enter aluminum shot and carry out deoxidation, after carrying out alloy increasing Mn, outbound thermometric, the outbound addition slag adjusting agents of RH are to get Ultra-low carbon aluminum killed steel steel
Water.
2. Ultra-low carbon aluminum killed steel steel treatment method according to claim 1, it is characterised in that:It is at least full in step A
One the next item down of foot:
CaOHan Liang > in the lime;90%;
The addition of the lime is 1.5~2.5Kg/t steel;
CaO content is 42~48%, Al in the slag adjusting agent2O3Content is 18~28%, and Al content is 6~8%;
The addition of the slag adjusting agent is 1.5~2.5Kg/t steel.
3. Ultra-low carbon aluminum killed steel steel treatment method according to claim 1, it is characterised in that:In step B, survey of entering the station
When dimension coolant-temperature gage, when temperature is inadequate, temperature operation is compensated, to control out the stations LF temperature as 1635~1660 DEG C.
4. Ultra-low carbon aluminum killed steel steel treatment method according to claim 1, it is characterised in that:In step B, survey of entering the station
When measuring oxygen content, the heat of 800ppm is higher than for oxygen, oxygen content is adjusted using aluminum shot or aluminum steel, the outbound oxygen activities of LF are controlled
In 800ppm.
5. Ultra-low carbon aluminum killed steel steel treatment method according to claim 4, it is characterised in that:The aluminum shot or aluminum steel
According to every drop 100ppm[O]0.15Kg/t steel is added to be controlled;
Preferably, the heat of 800ppm is higher than for oxygen, one time oxygen 100ppm drops in adjustment amount maximum, is adjusted again after determining oxygen.
6. Ultra-low carbon aluminum killed steel steel treatment method according to claim 1, it is characterised in that:In step B, the height
CaOHan Liang > in basicity refining slag;70%, CaF2Han Liang >20%;The addition of the high alkalinity refining slag is 1.5~2.5Kg/t
Steel.
7. Ultra-low carbon aluminum killed steel steel treatment method according to claim 1, it is characterised in that:In step C, molten steel into
RH stands, and the heat of 500ppm is less than for oxygen, oxygen blast oxygenation carbon drop operation is carried out, according to every increasing 100ppm[O]It is blown into amount of oxygen
0.12Nm3/ t steel is controlled;
Preferably, the heat of 500ppm is less than for oxygen, an adjustment amount maximum oxygenation 100ppm is adjusted again after determining oxygen.
8. Ultra-low carbon aluminum killed steel steel treatment method according to claim 1, it is characterised in that:It is described in step C
The oxygen value of determining that VCD determines oxygen is 250~500ppm.
9. Ultra-low carbon aluminum killed steel steel treatment method according to claim 1, it is characterised in that:In step C, the tune
CaO content is 42~48%, Al in slag agent2O3Content is 18~28%, and Al content is 6~8%;The addition of the slag adjusting agent
For 2.0~2.5Kg/t steel.
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| CN109722500A (en) * | 2019-02-28 | 2019-05-07 | 山东钢铁股份有限公司 | A kind of node control method for LF refining furnace processing carbon aluminium-killed steel molten steel |
| CN109735677A (en) * | 2018-12-10 | 2019-05-10 | 北京首钢股份有限公司 | A kind of smelting process reducing high-aluminum steel nozzle blocking probability |
| CN110144433A (en) * | 2019-07-03 | 2019-08-20 | 马鞍山钢铁股份有限公司 | A kind of deoxidation slagging method of carbon aluminium-killed steel |
| CN110331258A (en) * | 2019-08-07 | 2019-10-15 | 无锡东大汉森冶金实业有限公司 | Ultra-low carbon Si killed steel controls the production technology of Cr content in RH application of vacuum |
| CN110527775A (en) * | 2019-09-29 | 2019-12-03 | 马鞍山钢铁股份有限公司 | A kind of RH refining furnace chemical heating method suitable for carbon aluminium-killed steel |
| CN112195312A (en) * | 2020-09-29 | 2021-01-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving cleanliness of ultra-low carbon steel |
| CN112322835A (en) * | 2020-09-28 | 2021-02-05 | 甘肃酒钢集团宏兴钢铁股份有限公司 | LF high-alkalinity slagging process for square billet aluminum killed steel |
| CN114622129A (en) * | 2022-03-18 | 2022-06-14 | 安阳钢铁集团有限责任公司 | Production method for preparing ultralow-carbon low-aluminum high-silicon steel by LF + RH duplex method |
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| CN112195312B (en) * | 2020-09-29 | 2022-04-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving cleanliness of ultra-low carbon steel |
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