CN107663562B - The increased method of silicone content is prevented during Ultra-low carbon ultra-low silicon steel smelting - Google Patents
The increased method of silicone content is prevented during Ultra-low carbon ultra-low silicon steel smelting Download PDFInfo
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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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
Abstract
The invention discloses the increased method of silicone content is prevented during a kind of Ultra-low carbon ultra-low silicon steel smelting, include the following steps: 1) desulfurizing iron；2) converter smelting: aim carbon mass content control 0.030%~0.055%, 0.045%~0.070%, sulphur mass content controls below 0.005% the control of oxygen mass content；3) Argon；4) RH refine: to molten steel carry out decarburization, deoxidation, control molten steel in carbon mass content drop 0.005% hereinafter, the mass content of free oxygen in 20ppm hereinafter, the mass content of aluminium is below 0.005%；And carry out top of the slag deoxidation；5) continuous casting: tundish temperature controls target are as follows:+20~35 DEG C of molten steel liquidus temperature, the mass content of the middle free oxygen of packet is controlled in 50ppm or less.It is trace until continuous casting terminates that this method, which is able to maintain in smelting process in molten steel silicon, successfully solves the problems, such as the increasing silicon during Ultra-low carbon ultra-low silicon steel smelting.
Description
Technical field
The present invention relates to a kind of production methods of the ultralow silicon steel of Ultra-low carbon, particularly relate to a kind of Ultra-low carbon ultra-low silicon steel smelting
The increased method of silicone content is prevented in the process.
Background technique
The ultralow silicon steel of Ultra-low carbon generally requires the silicone content of its finished product in kind all 0.005% hereinafter, in general converter
Steel-making tapping Shi Gangzhong silicone content be trace, i.e., silicon be 0.005% hereinafter, but this kind of steel will also through RH refine, pour
The rear processes such as note, if control is bad, the silicon in molten steel be will increase very much.Cause the ingredient of steel not conform to, so as to cause changing the original sentence to or
Sentence useless.
Chinese invention patent " smelting low-silicon steel silicone content control technique " (application number 201210180384.0), discloses one
The low silicon variety steel of kind prevents the technique of smelting process increasing silicon and stability contorting molten steel terminal silicone content, by bessemerizing terminal essence
Quasi- ingredient and temperature control, tapping deoxidization alloying and stay oxygen to operate, refining furnace stay early period oxidizing slag heating, process deoxidation,
The optimization of desulfurization slagging process makes entire smelting process molten steel increase silicon less than 0.02%, and smelting endpoint Composition Control is stablized accurately,
Casting billet surface and internal soundness are excellent, reduce slab oven improvement.However, the patented method can only make entire smelting process molten steel
Increase silicon less than 0.02%, is only applicable to conventional low-silicon steel；And the ultralow silicon steel of Ultra-low carbon generally requires the silicon of its finished product in kind to contain
Amount is all 0.005% hereinafter, require trace, it is clear that is not able to satisfy the ultralow silicon steel material object finished product of Ultra-low carbon with the method for the patent
Silicone content in 0.005% requirement below.
Summary of the invention
The purpose of the present invention is to provide a kind of ultralow silicon steel smeltings of Ultra-low carbon that can be effectively reduced increasing silicon in smelting process
The increased method of silicone content is prevented during refining.
To achieve the above object, prevent silicone content increased during the Ultra-low carbon ultra-low silicon steel smelting designed by the present invention
Method includes the following steps:
1) desulfurizing iron: desulfurizing iron keeps mass content S≤0.002% of Sulfur Content in Hot Iron (unless otherwise indicated, of the invention
Involved in constituent content be mass content), while controlling the mass content of Ti, Nb, V in molten iron: Ti+Nb+V≤0.020%,
Main purpose is to reduce Ti, Nb, V etc. in steel to be easier to the metallic element reacted with oxygen carbon than aluminium, to reduce time silicon of molten steel, strictly
Control residual elements in steel；
2) converter smelting: aim carbon mass content control 0.030%~0.055%, oxygen mass content is controlled 0.045%
~0.070%, main purpose is that for molten steel, natural decarburization is prepared in RH furnace, while also reducing the silicon that alloy is brought into；Sulphur matter
Content control is measured below 0.005%；Tapping target temperature: 1680~1700 DEG C, this is high temperature tapping, and predominantly RH furnace refines
Make temperature preparation, because RH furnace does not have heating efficiency, if temperature is too low will to add aluminium heating by O2 blowing, silicon can be brought into, high temperature goes out
Steel just can avoid this operation；Tapping not pre-deoxidation, it is therefore an objective to control terminal oxygen content in aforementioned range；
3) Argon: the top of the slag sheds 0.1~0.5kg/ tons of steel of aluminum shot before RH on ladle, and 0.1~0.3kg/ tons of steel of calcium carbide will
Iron oxide total amount (TFe) is reduced to mass content 10% hereinafter, argon station soft blow 0.5~3 minute in slag；
4) RH is refined: carrying out decarburization, deoxidation to molten steel, the mass content for controlling carbon in molten steel is dropped 0.005% hereinafter, certainly
By the mass content of oxygen in 20ppm hereinafter, the mass content of aluminium is below 0.005%；And top of the slag deoxidation is carried out, make Quan Tie in slag
With the sum of manganese oxide mass content less than 10%；After RH has been refined, molten steel not Argon, upper continuous casting after calm a period of time；
5) continuous casting: big water-coating port argon envelope, middle packet use soaking water gap, reduce molten steel and contact with oxygen, nitrogen；Tundish temperature control
Target are as follows:+20~35 DEG C of molten steel liquidus temperature；The mass content of the middle free oxygen of packet is controlled in 50ppm or less；Casting speed
Are as follows: 0.5~1.5m/min.
Preferably, in step 1), while the mass content for controlling residual elements in steel meets: Cu+Ni+Cr+Mo≤
0.05%, to improve the clarity of steel, prevent the degradation of steel.
Preferably, in step 3), new slag is made to ladle before Argon, it is therefore an objective to covering molten steel makes its not oxidation by air, and
Adsorb the harmful elements such as sulphur, the phosphorus in steel.
Preferably, in step 4), molten steel decarburization, deoxidation specific steps are as follows: use nature decarburization, that is, utilize the oxygen in steel
It is reacted with carbon, generates carbon monoxide, and discharge out of the furnace, because there is the preparation of oxygen content and temperature in front, can only be adopted in RH furnace
With natural decarburization, and do not have to oxygen blast and carry out pressure decarburization, reduces the oxygen in steel, that is, reduce the addition of subsequent final deoxidizing aluminium
Amount；If carbon content is higher, and oxygen content is lower, can also carry out pressure decarburization with oxygen blast；Furnace pressure be maintained at 100Pa with
Under, carbon is taken off into mass content 0.005% hereinafter, and making the mass content of free oxygen in steel in 350ppm hereinafter, actually
The free oxygen in steel can only be controlled in 300~350ppm at this time, then low decarburization is just had any problem, as far as possible toward low control, be in order to
Afterwards plus when aluminium final deoxidizing, less plus aluminum shot；Add aluminum shot deoxidation into RH furnace again, the mass content of free oxygen in molten steel is made to exist
20ppm is hereinafter, and make the mass content of aluminium in steel 0.005% hereinafter, making aluminium content in steel few as far as possible after deoxidation, to reduce aluminium
With time silicon of silicon dioxde reaction.
Preferably, in step 4), if on molten steel before RH furnace temperature less than 1600 DEG C, first upper LF stove heating to 1630~
RH furnace is gone up after 1680 DEG C again.It is heated up with the method, only will increase the carbon in molten steel, silicon will not be increased, carbon is in subsequent RH furnace essence
Refining can be easy to take off.
Preferably, in step 4), after RH is refined, the oxygen such as Ti, Nb, V for reacting with oxygen carbon is easier to than aluminium in molten steel
It is melted into trace, mass content meets: Ti+Nb+V≤0.0060%, and Ti+Nb+V+Al≤0.010%.The purpose is to reduce
SiO in slag2, MnO, FeO reacted with Ti, Nb, V's etc., i.e. SiO2+ Ti=TiO2+ Si, MnO+Ti=TiO2+ Mn, FeO+Ti=
TiO2+ Fe (by taking Ti as an example) reduces the total oxygen content in steel and returns silicon and Hui Meng.
Preferably, in step 5), before continuous casting, centering packet is needed to blow roasting 3 hours or more, and centering packet carries out argon displacement, with
Reduce the secondary oxidation and hydrogen content of steel.
The beneficial effects of the present invention are: the ultralow silicon steel of Ultra-low carbon generally requires the silicone content of its finished product in kind all to exist
0.005% hereinafter, require trace, and it is trace until continuous casting terminates that the present invention, which is able to maintain in smelting process silicon in molten steel, at
Function solves the problems, such as the increasing silicon during Ultra-low carbon ultra-low silicon steel smelting, keeps silicon stability contorting real in 0.005% product below
Object accounts for 98% or more, reduces slab oven improvement, economic benefit greatly improved.
Detailed description of the invention
Fig. 1 is the production that Ultra-low carbon ultra-low silicon steel smelting provided by the present invention prevents the increased method of silicone content in the process
Process flow chart.
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
As shown in Figure 1, the increased method of silicone content is prevented during Ultra-low carbon ultra-low silicon steel smelting provided by the present invention,
Its process route are as follows: desulfurizing iron, phosphorus, silicon → converter smelting → Argon → RH furnace processing → continuous casting → square billet inspection are checked and accepted.Tool
Body includes the following steps:
1) desulfurizing iron:
Desulfurizing iron target S≤0.002%, in molten iron: Ti+Nb+V≤0.020%, main purpose be reduce Ti in steel,
Nb, V etc. are easier to the metallic element reacted with oxygen carbon than aluminium, to reduce time silicon of molten steel.Residual elements Cu+Ni in strict control steel
+ Cr+Mo≤0.05% prevents the degradation of steel to improve the clarity of steel.
2) converter smelting:
Aim carbon controls 0.030%~0.055%, O control 0.045%~0.070%, and main purpose is existed for molten steel
Natural decarburization is prepared in RH furnace, and S is controlled below 0.005%.
Tapping target temperature: 1680~1700 DEG C, this is high temperature tapping, and temperature preparation is made in predominantly RH furnace refining, because
RH furnace does not have heating efficiency, if temperature is too low will to add aluminium heating by O2 blowing, can bring silicon into, high temperature tapping just can avoid this behaviour
Make；Tapping not pre-deoxidation.
3) Argon:
Big Bao Zaoxin slag.The top of the slag sheds 0.1~0.5kg/ tons of steel of aluminum shot before RH on ladle, and 0.1~0.3kg/ tons of calcium carbide
Iron oxide total amount (TFe) in slag is reduced to 10% hereinafter, argon station soft blow 0.5~3 minute by steel.
4) RH is refined:
For temperature less than 1600 DEG C, upper LF stove heating goes up RH furnace to 1630~1680 DEG C again later before RH furnace on molten steel, uses
The method heating, only will increase the carbon in molten steel, will not increase silicon, and carbon can be easy to take off in subsequent RH furnace refining.It is adopted in RH
With natural decarburization, it is exactly to be reacted using the oxygen in steel with carbon, generates carbon monoxide, and discharge out of the furnace.Furnace pressure is maintained at
100Pa is hereinafter, taking off carbon to after 0.005% or less, and the free oxygen in steel is in 350ppm hereinafter, the actually freedom in steel at this time
Oxygen can only be controlled in 300~350ppm, then low decarburization is just had any problem, and be for subsequent plus aluminium final deoxidizing as far as possible toward low control
When, less plus aluminum shot.Add aluminum shot deoxidation, makes in steel free oxygen in 20ppm hereinafter, and making in steel aluminium content 0.005% hereinafter, de-
Make aluminium content in steel few as far as possible after oxygen, to reduce time silicon of aluminium and silicon dioxde reaction.And top of the slag deoxidation is carried out, make Quan Tie in slag
+ manganese oxide is less than 10%.The calm a period of time (15~30 minutes) of molten steel goes up continuous casting afterwards.The metal reacted with oxygen carbon is easier to than aluminium
Element is oxidized to trace substantially, in molten steel: Ti+Nb+V≤0.0060%, and Ti+Nb+V+Al≤0.010% are reduced in slag
SiO2, MnO, FeO reacted with Ti's etc., i.e. SiO2+ Ti=TiO2+ Si, MnO+Ti=TiO2+ Mn, FeO+Ti=TiO2+ Fe etc.
Reaction reduces the total oxygen content in steel and returns silicon and Hui Meng.
5) continuous casting:
Middle packet is blown roasting 3 hours or more, and centering packet carries out argon displacement before continuous casting.Big water-coating port argon envelope, middle packet is using immersion
The mouth of a river is reduced molten steel and is contacted with oxygen, nitrogen.Tundish temperature controls target are as follows:+20~35 DEG C of molten steel liquidus temperature.Middle packet is freely
Oxygen is controlled in 50ppm or less.Casting speed are as follows: 0.5~1.5m/min.
By above-mentioned steps, specific technological parameter is given in following embodiment.
Embodiment 1
Desulfurizing iron: in molten iron: S=0.002%, Ti+Nb+V=0.020%, residual elements Cu+Ni in strict control steel
+ Cr+Mo≤0.05%.
Converter smelting: aim carbon 0.030%, O=0.070%.Tapping temperature: 1700 DEG C；Tapping not pre-deoxidation.
RH refining: using nature decarburization in RH, furnace pressure is maintained at 100Pa hereinafter, carbon is taken off to after 0.005%, steel
In free oxygen in 350ppm.Add aluminum shot deoxidation, in steel free oxygen in 20ppm, steel aluminium content 0.005%.And carry out slag
Emaciated face oxygen, Quan Tie+manganese oxide is 10% in slag.Molten steel calm 15 minutes upper continuous castings.
Continuous casting: middle packet is blown roasting 3 hours or more, and centering packet carries out argon displacement before continuous casting.Big water-coating port argon envelope, middle Bao Caiyong
Soaking water gap reduces molten steel and contacts with oxygen, nitrogen.Tundish temperature controls target are as follows:+20~35 DEG C of molten steel liquidus temperature.Middle packet
Free oxygen control is in 50ppm or less.Casting speed are as follows: 0.5~1.5m/min.
Embodiment 2
Desulfurizing iron: in molten iron: S=0.0018%, Ti+Nb+V=0.018%, residual elements Cu+ in strict control steel
Ni+Cr+Mo≤0.05%.
Converter smelting: aim carbon 0.035%, O=0.065%.Tapping temperature: 1697 DEG C；Tapping not pre-deoxidation.
RH refining: using nature decarburization in RH, furnace pressure is maintained at 100Pa hereinafter, carbon is taken off to after 0.0048%, steel
In free oxygen in 250ppm.Add aluminum shot deoxidation, in steel free oxygen in 18ppm, steel aluminium content 0.0048%.And carry out slag
Emaciated face oxygen, Quan Tie+manganese oxide is 9% in slag.Molten steel calm 15 minutes upper continuous castings.
Continuous casting: middle packet is blown roasting 3 hours or more, and centering packet carries out argon displacement before continuous casting.Big water-coating port argon envelope, middle Bao Caiyong
Soaking water gap reduces molten steel and contacts with oxygen, nitrogen.Tundish temperature controls target are as follows:+20~35 DEG C of molten steel liquidus temperature.Middle packet
Free oxygen control is in 50ppm or less.Casting speed are as follows: 0.5~1.5m/min.
Embodiment 3
Desulfurizing iron: in molten iron: S=0.0015%, Ti+Nb+V=0.015%, residual elements Cu+ in strict control steel
Ni+Cr+Mo≤0.05%.
Converter smelting: aim carbon 0.040%, O=0.060%.Tapping temperature: 1694 DEG C；Tapping not pre-deoxidation.
RH refining: using nature decarburization in RH, furnace pressure is maintained at 100Pa hereinafter, carbon is taken off to after 0.0045%, steel
In free oxygen in 150ppm.Add aluminum shot deoxidation, in steel free oxygen in 15ppm, steel aluminium content 0.0045%.And carry out slag
Emaciated face oxygen, Quan Tie+manganese oxide is 8% in slag.Molten steel calm 15 minutes upper continuous castings.
Continuous casting: middle packet is blown roasting 3 hours or more, and centering packet carries out argon displacement before continuous casting.Big water-coating port argon envelope, middle Bao Caiyong
Soaking water gap reduces molten steel and contacts with oxygen, nitrogen.Tundish temperature controls target are as follows:+20~35 DEG C of molten steel liquidus temperature.Middle packet
Free oxygen control is in 50ppm or less.Casting speed are as follows: 0.5~1.5m/min.
Embodiment 4
Desulfurizing iron: in molten iron: S=0.0013%, Ti+Nb+V=0.013%, residual elements Cu+ in strict control steel
Ni+Cr+Mo≤0.05%.
Converter smelting: aim carbon 0.045%, O=0.055%.Tapping temperature: 1691 DEG C；Tapping not pre-deoxidation.
RH refining: using nature decarburization in RH, 0.2 cubic metre of steel oxygen blast per ton in furnace, furnace pressure be maintained at 100Pa with
Under, carbon is taken off to after 0.0040%, the free oxygen in steel is in 200ppm.Add aluminum shot deoxidation, free oxygen is in 13ppm, steel in steel
Aluminium content is 0.0040%.And top of the slag deoxidation is carried out, Quan Tie+manganese oxide is 7% in slag.Molten steel calm 15 minutes upper continuous castings.
Continuous casting: middle packet is blown roasting 3 hours or more, and centering packet carries out argon displacement before continuous casting.Big water-coating port argon envelope, middle Bao Caiyong
Soaking water gap reduces molten steel and contacts with oxygen, nitrogen.Tundish temperature controls target are as follows:+20~35 DEG C of molten steel liquidus temperature.Middle packet
Free oxygen control is in 50ppm or less.Casting speed are as follows: 0.5~1.5m/min.
Embodiment 5
Desulfurizing iron: in molten iron: S=0.0010%, Ti+Nb+V=0.010%, residual elements Cu+ in strict control steel
Ni+Cr+Mo≤0.05%.
Converter smelting: aim carbon 0.050%, O=0.050%.Tapping temperature: 1685 DEG C；Tapping not pre-deoxidation.
RH refining: using nature decarburization in RH, 0.3 cubic metre of steel oxygen blast per ton in furnace, furnace pressure be maintained at 100Pa with
Under, carbon is taken off to after 0.0035%, the free oxygen in steel is in 200ppm.Add aluminum shot deoxidation, free oxygen is in 10ppm, steel in steel
Aluminium content is 0.0035%.And top of the slag deoxidation is carried out, Quan Tie+manganese oxide is 6% in slag.Molten steel calm 15 minutes upper continuous castings.
Continuous casting: middle packet is blown roasting 3 hours or more, and centering packet carries out argon displacement before continuous casting.Big water-coating port argon envelope, middle Bao Caiyong
Soaking water gap reduces molten steel and contacts with oxygen, nitrogen.Tundish temperature controls target are as follows:+20~35 DEG C of molten steel liquidus temperature.Middle packet
Free oxygen control is in 50ppm or less.Casting speed are as follows: 0.5~1.5m/min.
Embodiment 6
Desulfurizing iron: in molten iron: S=0.0008%, Ti+Nb+V=0.0080%, residual elements Cu+ in strict control steel
Ni+Cr+Mo≤0.05%.
Converter smelting: aim carbon 0.055%, O=0.045%.Tapping temperature: 1680 DEG C；Tapping not pre-deoxidation.
RH refining: using nature decarburization in RH, 0.4 cubic metre of steel oxygen blast per ton in furnace, furnace pressure be maintained at 100Pa with
Under, carbon is taken off to after 0.0030%, the free oxygen in steel is in 200ppm.Add aluminum shot deoxidation, free oxygen aluminium in 8ppm, steel in steel
Content is 0.0030%.And top of the slag deoxidation is carried out, Quan Tie+manganese oxide is 5% in slag.Molten steel calm 15 minutes upper continuous castings.
Continuous casting: middle packet is blown roasting 3 hours or more, and centering packet carries out argon displacement before continuous casting.Big water-coating port argon envelope, middle Bao Caiyong
Soaking water gap reduces molten steel and contacts with oxygen, nitrogen.Tundish temperature controls target are as follows:+20~35 DEG C of molten steel liquidus temperature.Middle packet
Free oxygen control is in 50ppm or less.Casting speed are as follows: 0.5~1.5m/min.
Each embodiment some processes parameter and finished product silicone content are listed in the following table.
1 some processes parameter of table and finished product silicone content
As can be known from the above table, the finished product silicone content of each embodiment is 0.005% hereinafter, successfully solve Ultra-low carbon ultra-low silicon
Increasing silicon problem during steel smelting.Wherein, embodiment 3 is Optimal Control example, i.e. converter terminal carbon control is in 400ppm, oxygen control
System oxygen content in steel after 600ppm, RH decarburization is 150ppm, and the aluminum amount that final deoxidizing adds is minimum, and the silicon brought into is also minimum, simultaneously
Aluminate in steel is also few.
Claims (7)
1. preventing the increased method of silicone content during a kind of Ultra-low carbon ultra-low silicon steel smelting, it is characterised in that: including walking as follows
It is rapid:
1) desulfurizing iron: desulfurizing iron makes mass content S≤0.002% of Sulfur Content in Hot Iron, while controlling Ti, Nb, V in molten iron
Mass content: Ti+Nb+V≤0.020%；
2) converter smelting: aim carbon mass content control 0.030%~0.055%, the control of oxygen mass content 0.045%~
0.070%, sulphur mass content controls below 0.005%；Tapping target temperature: 1680~1700 DEG C；
3) Argon: the top of the slag sheds 0.1~0.5kg/ tons of steel of aluminum shot before RH on ladle, and 0.1~0.3kg/ tons of steel of calcium carbide will be in slag
Iron oxide total amount is reduced to mass content 10% hereinafter, argon station soft blow 0.5~3 minute；
4) RH is refined: carrying out decarburization, deoxidation to molten steel, the mass content for controlling carbon in molten steel is dropped 0.005% hereinafter, free oxygen
Mass content in 20ppm hereinafter, the mass content of aluminium is below 0.005%；And top of the slag deoxidation is carried out, make full iron and oxygen in slag
Change the sum of manganese mass content less than 10%；After RH has been refined, molten steel not Argon, upper continuous casting after calm a period of time；
5) continuous casting: big water-coating port argon envelope, middle packet use soaking water gap, reduce molten steel and contact with oxygen, nitrogen；Tundish temperature controls target
Are as follows:+20~35 DEG C of molten steel liquidus temperature；The mass content of the middle free oxygen of packet is controlled in 50ppm or less；Casting speed are as follows: 0.5
~1.5m/min.
2. preventing the increased method of silicone content, feature during Ultra-low carbon ultra-low silicon steel smelting according to claim 1
It is: in step 3), new slag is made to ladle before Argon.
3. preventing the increased method of silicone content, feature during Ultra-low carbon ultra-low silicon steel smelting according to claim 1
Be: in step 4), molten steel decarburization, deoxidation specific steps are as follows: use nature decarburization, furnace pressure be maintained at 100Pa hereinafter,
Carbon is taken off into mass content 0.005% hereinafter, and making the mass content of free oxygen in steel in 350ppm or less；Again into RH furnace
Add aluminum shot deoxidation, makes the mass content of free oxygen in molten steel in 20ppm hereinafter, and making the mass content of aluminium in steel 0.005%
Below.
4. preventing silicone content increased during Ultra-low carbon ultra-low silicon steel smelting described in any one of claim 1 to 3
Method, it is characterised in that: in step 4), if temperature first goes up LF stove heating to 1630 less than 1600 DEG C before RH furnace on molten steel
RH furnace is gone up after~1680 DEG C again.
5. preventing silicone content increased during Ultra-low carbon ultra-low silicon steel smelting described in any one of claim 1 to 3
Method, it is characterised in that: in step 4), it is already oxidised after RH is refined, in molten steel than aluminium to be easier to Ti, Nb, V for reacting with oxygen carbon
At trace, mass content meets: Ti+Nb+V≤0.0060%, and Ti+Nb+V+Al≤0.010%.
6. preventing silicone content increased during Ultra-low carbon ultra-low silicon steel smelting described in any one of claim 1 to 3
Method, it is characterised in that: in step 5), before continuous casting, centering packet is needed to blow roasting 3 hours or more, and centering packet carries out argon displacement.
7. preventing silicone content increased during Ultra-low carbon ultra-low silicon steel smelting described in any one of claim 1 to 3
Method, it is characterised in that: in step 1), while the mass content for controlling residual elements in steel meets: Cu+Ni+Cr+Mo≤
0.05%.
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| CN109082496A (en) * | 2018-08-09 | 2018-12-25 | 山东钢铁股份有限公司 | A kind of method of whole process hypoxemia position smelting suprelow carbon steel |
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