CN107663562A - 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
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Abstract
The invention discloses the increased method of silicone content is prevented during a kind of Ultra-low carbon ultra-low silicon steel smelting, comprise 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 is refined：Decarburization, deoxidation are carried out to molten steel, control the mass content of carbon in molten steel to drop below 0.005%, the mass content of free oxygen is in below 20ppm, and the mass content of aluminium is below 0.005%；And carry out top of the slag deoxidation；5) continuous casting：Tundish temperature control targe is：+ 20~35 DEG C of molten steel liquidus temperature, the mass content of the middle free oxygen of bag are controlled in below 50ppm.It is vestige until continuous casting terminates that this method, which can keep 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 method of the ultralow silicon steel of Ultra-low carbon, particularly relates to a kind of Ultra-low carbon ultra-low silicon steel smelting
During prevent the increased method of silicone content.
Background technology
The ultralow silicon steel of Ultra-low carbon typically requires the silicone content of its finished product in kind all below 0.005%, in general converter
Silicone content has been vestige in steel during steel-making tapping, i.e. silicon has been less than 0.005%, but this kind of steel will also be refined through RH, poured
The rear processes such as note, if control is bad, the silicon in molten steel can increase a lot.Cause the composition of steel not conform to, so as to causing to change 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 smelting process from increasing the technique of silicon and stability contorting molten steel terminal silicone content, by bessemerizing terminal essence
Accurate composition and temperature control, tapping deoxidization alloying and stay oxygen to operate, refining furnace stay early stage oxidizing slag heating, process deoxidation,
The optimization of desulfurization slagging process, whole smelting process molten steel is increased silicon and be less than 0.02%, smelting endpoint Composition Control stablize it is accurate,
Casting billet surface and internal soundness are excellent, reduce strand oven improvement.However, the patented method can only make whole smelting process molten steel
Increase silicon and be less than 0.02%, be only applicable to conventional low-silicon steel；And the ultralow silicon steel of Ultra-low carbon typically requires that the silicon of its finished product in kind contains
Amount requires vestige, it is clear that can not meet the ultralow silicon steel material object finished product of Ultra-low carbon with the method for the patent all below 0.005%
Requirement of the silicone content below 0.005%.
The content of the invention
It is an object of the invention to provide a kind of ultralow silicon steel smelting of Ultra-low carbon that can effectively reduce increasing silicon in smelting process
The increased method of silicone content is prevented during refining.
To achieve the above object, prevent that silicone content is increased during the Ultra-low carbon ultra-low silicon steel smelting designed by the present invention
Method, comprise the following steps：
1) desulfurizing iron：Desulfurizing iron makes mass content S≤0.002% of Sulfur Content in Hot Iron (unless otherwise indicated, of the invention
In to be related to constituent content be mass content), while control 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 more easy to metallic element with the reaction of oxygen carbon than aluminium, returns silicon with reduce 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 natural decarburization is prepared in RH stoves for molten steel, while also reduces the silicon that alloy is brought into；Sulphur matter
Content control is measured below 0.005%；Tapping target temperature：1680~1700 DEG C, this taps for high temperature, and predominantly RH stoves refine
Make temperature preparation, because RH stoves do 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 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 aluminum shot 0.1~0.5kg/ ton steel before RH on ladle, and calcium carbide 0.1~0.3kg/ ton steel will
Iron oxide total amount (TFe) is reduced to mass content below 10% in slag, argon station soft blow 0.5~3 minute；
4) RH is refined：Decarburization, deoxidation are carried out to molten steel, control the mass content of carbon in molten steel to drop below 0.005%, from
By the mass content of oxygen in below 20ppm, the mass content of aluminium is below 0.005%；And top of the slag deoxidation is carried out, make full iron in slag
It is less than 10% with manganese oxide mass content sum；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 bag use soaking water gap, reduce molten steel and are contacted with oxygen, nitrogen；Tundish temperature controls
Target is：+ 20~35 DEG C of molten steel liquidus temperature；The mass content of the middle free oxygen of bag is controlled in below 50ppm；Casting speed
For：0.5~1.5m/min.
Preferably, in step 1), while the mass content of residual elements in steel is controlled to meet：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 before Argon to ladle, it is therefore an objective to covering molten steel makes its not oxidation by air, and
The harmful elements such as sulphur, phosphorus in absorption steel.
Preferably, in step 4), molten steel decarburization, deoxidation concretely comprise the following steps：Using nature decarburization, that is, utilize the oxygen in steel
Reacted with carbon, generate carbon monoxide, and discharged out of the furnace, because above there is the preparation of oxygen content and temperature, can only adopted in RH stoves
With natural decarburization, and pressure decarburization is carried out without oxygen blast, reduce the oxygen in steel, that is, reduce the addition of follow-up final deoxidizing aluminium
Amount；If carbon content is higher, and oxygen content is relatively low, can also oxygen blast carry out pressure decarburization；Furnace pressure be maintained at 100Pa with
Under, carbon is taken off into mass content below 0.005%, and make the mass content of the free oxygen in steel in below 350ppm, actually
Now the free oxygen in steel can only be controlled in 300~350ppm, then low decarburization is just had any problem, as far as possible toward low control, be in order to
Afterwards plus during aluminium final deoxidizing, less plus aluminum shot；Add aluminum shot deoxidation into RH stoves again, the mass content of free oxygen in molten steel is existed
Below 20ppm, and make the mass content of aluminium in steel make aluminium content in steel as far as possible few below 0.005%, after deoxidation, to reduce aluminium
With time silicon of silicon dioxde reaction.
Preferably, in step 4), if temperature is less than 1600 DEG C before RH stoves on molten steel, first upper LF stove heats to 1630~
RH stoves are gone up after 1680 DEG C again.Heated up with the method, can only increase the carbon in molten steel, silicon will not be increased, carbon is in subsequent RH stoves essence
Refining can be easy to take off.
Preferably, in step 4), after RH is refined, it is more easy to and Ti, Nb, V etc. of the reaction of oxygen carbon oxygen than aluminium in molten steel
Vestige is melted into, its 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 and Ti, Nb, V etc. reaction, i.e. SiO2+ Ti=TiO2+ Si, MnO+Ti=TiO2+ Mn, FeO+Ti=
TiO2+ Fe (by taking Ti as an example), reduce the total oxygen content in steel and return silicon and Hui Meng.
Preferably, in step 5), before continuous casting, centering bag is needed to blow roasting more than 3 hours, and centering bag carries out argon displacement, with
Reduce the secondary oxidation and hydrogen content of steel.
The beneficial effects of the invention are as follows：The ultralow silicon steel of Ultra-low carbon typically requires that the silicone content of its finished product in kind all exists
Less than 0.005%, that is, require vestige, it is vestige until continuous casting terminates that the present invention, which can keep in smelting process in molten steel silicon, into
Work(solves the problems, such as the increasing silicon during Ultra-low carbon ultra-low silicon steel smelting, makes product of the silicon stability contorting below 0.005% real
Thing accounts for more than 98%, reduces strand oven improvement, economic benefit greatly improved.
Brief description of the drawings
Fig. 1 is to prevent the production of the increased method of silicone content during Ultra-low carbon ultra-low silicon steel smelting provided by the present invention
Process chart.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
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 is：Desulfurizing iron, phosphorus, silicon → converter smelting → Argon → RH stoves processing → continuous casting → square billet inspection, check and accept.Tool
Body comprises the following steps：
1) desulfurizing iron：
Desulfurizing iron target S≤0.002%, in molten iron：Ti+Nb+V≤0.020%, main purpose be reduce steel in Ti,
Nb, V etc. are more easy to the metallic element with the reaction of oxygen carbon than aluminium, to reduce time silicon of molten steel.Residual elements Cu+Ni in strict control steel
+ Cr+Mo≤0.05%, to improve the clarity of steel, prevent the degradation of steel.
2) converter smelting：
Aim carbon controls 0.030%~0.055%, O controls, and main purpose is existed for molten steel 0.045%~0.070%
Natural decarburization is prepared in RH stoves, and S is controlled below 0.005%.
Tapping target temperature：1680~1700 DEG C, this taps for high temperature, and temperature preparation is made in predominantly RH stoves refining, because
RH stoves do not have heating efficiency, if temperature is too low will to add aluminium heating by O2 blowing, can bring silicon into, high temperature tapping can avoid this behaviour
Make；Tapping not pre-deoxidation.
3) Argon：
Big Bao Zaoxin slags.The top of the slag sheds aluminum shot 0.1~0.5kg/ ton steel, calcium carbide 0.1~0.3kg/ tons before RH on ladle
Steel, iron oxide total amount (TFe) in slag is reduced to less than 10%, argon station soft blow 0.5~3 minute.
4) RH is refined：
Temperature is less than 1600 DEG C before RH stoves on molten steel, and upper LF stove heats go up RH stoves again afterwards to 1630~1680 DEG C, uses
The method heats up, and can only increase the carbon in molten steel, will not increase silicon, and carbon can be easy to take off in subsequent RH stoves refining.Adopted in RH
With natural decarburization, it is exactly to be reacted using the oxygen in steel and carbon, generates carbon monoxide, and discharge out of the furnace.Furnace pressure is maintained at
Below 100Pa, carbon is taken off to after less than 0.005%, the free oxygen in steel is in below 350ppm, the actually now freedom in steel
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, add aluminum shot less.Add aluminum shot deoxidation, make in steel free oxygen in below 20ppm, and aluminium content in steel below 0.005%, is taken off
Make aluminium content in steel as far as possible few after oxygen, to reduce time silicon of aluminium and silicon dioxde reaction.And top of the slag deoxidation is carried out, make full iron 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 with the reaction of oxygen carbon is more easy to than aluminium
Element is oxidized to vestige substantially, in molten steel：Ti+Nb+V≤0.0060%, and Ti+Nb+V+Al≤0.010%, reduce in slag
SiO2, MnO, FeO and Ti etc. reaction, i.e. SiO2+ Ti=TiO2+ Si, MnO+Ti=TiO2+ Mn, FeO+Ti=TiO2+ Fe etc.
Reaction, reduce the total oxygen content in steel and return silicon and Hui Meng.
5) continuous casting：
Middle bag blows roasting more than 3 hours, and centering bag carries out argon displacement before continuous casting.Big water-coating port argon envelope, middle bag is using immersion
The mouth of a river, reduce molten steel and contacted with oxygen, nitrogen.Tundish temperature control targe is：+ 20~35 DEG C of molten steel liquidus temperature.Middle bag is freely
Oxygen is controlled in below 50ppm.Casting speed is：0.5~1.5m/min.
By above-mentioned steps, specific technological parameter is given in following examples.
Embodiment 1
Desulfurizing iron：In molten iron：S=0.002%, Ti+Nb+V=0.020% are strict to control residual elements Cu+Ni in steel
+ Cr+Mo≤0.05%.
Converter smelting：Aim carbon 0.030%, O=0.070%.Tapping temperature：1700℃；Tapping not pre-deoxidation.
RH is refined：Nature decarburization is used in RH, furnace pressure is maintained at below 100Pa, 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, full iron+manganese oxide is 10% in slag.Calm 15 minutes upper continuous castings of molten steel.
Continuous casting：Middle bag blows roasting more than 3 hours, and centering bag carries out argon displacement before continuous casting.Big water-coating port argon envelope, middle bag use
Soaking water gap, reduce molten steel and contacted with oxygen, nitrogen.Tundish temperature control targe is：+ 20~35 DEG C of molten steel liquidus temperature.Middle bag
Free oxygen control is in below 50ppm.Casting speed is：0.5~1.5m/min.
Embodiment 2
Desulfurizing iron：In molten iron：S=0.0018%, Ti+Nb+V=0.018% are strict to control residual elements Cu+ in steel
Ni+Cr+Mo≤0.05%.
Converter smelting：Aim carbon 0.035%, O=0.065%.Tapping temperature：1697℃；Tapping not pre-deoxidation.
RH is refined：Nature decarburization is used in RH, furnace pressure is maintained at below 100Pa, 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, full iron+manganese oxide is 9% in slag.Calm 15 minutes upper continuous castings of molten steel.
Continuous casting：Middle bag blows roasting more than 3 hours, and centering bag carries out argon displacement before continuous casting.Big water-coating port argon envelope, middle bag use
Soaking water gap, reduce molten steel and contacted with oxygen, nitrogen.Tundish temperature control targe is：+ 20~35 DEG C of molten steel liquidus temperature.Middle bag
Free oxygen control is in below 50ppm.Casting speed is：0.5~1.5m/min.
Embodiment 3
Desulfurizing iron：In molten iron：S=0.0015%, Ti+Nb+V=0.015% are strict to control residual elements Cu+ in steel
Ni+Cr+Mo≤0.05%.
Converter smelting：Aim carbon 0.040%, O=0.060%.Tapping temperature：1694℃；Tapping not pre-deoxidation.
RH is refined：Nature decarburization is used in RH, furnace pressure is maintained at below 100Pa, 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, full iron+manganese oxide is 8% in slag.Calm 15 minutes upper continuous castings of molten steel.
Continuous casting：Middle bag blows roasting more than 3 hours, and centering bag carries out argon displacement before continuous casting.Big water-coating port argon envelope, middle bag use
Soaking water gap, reduce molten steel and contacted with oxygen, nitrogen.Tundish temperature control targe is：+ 20~35 DEG C of molten steel liquidus temperature.Middle bag
Free oxygen control is in below 50ppm.Casting speed is：0.5~1.5m/min.
Embodiment 4
Desulfurizing iron：In molten iron：S=0.0013%, Ti+Nb+V=0.013% are strict to control residual elements Cu+ in steel
Ni+Cr+Mo≤0.05%.
Converter smelting：Aim carbon 0.045%, O=0.055%.Tapping temperature：1691℃；Tapping not pre-deoxidation.
RH is refined：Use nature decarburization in RH, 0.2 cubic metre of steel oxygen blast per ton in stove, 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, full iron+manganese oxide is 7% in slag.Calm 15 minutes upper continuous castings of molten steel.
Continuous casting：Middle bag blows roasting more than 3 hours, and centering bag carries out argon displacement before continuous casting.Big water-coating port argon envelope, middle bag use
Soaking water gap, reduce molten steel and contacted with oxygen, nitrogen.Tundish temperature control targe is：+ 20~35 DEG C of molten steel liquidus temperature.Middle bag
Free oxygen control is in below 50ppm.Casting speed is：0.5~1.5m/min.
Embodiment 5
Desulfurizing iron：In molten iron：S=0.0010%, Ti+Nb+V=0.010% are strict to control residual elements Cu+ in steel
Ni+Cr+Mo≤0.05%.
Converter smelting：Aim carbon 0.050%, O=0.050%.Tapping temperature：1685℃；Tapping not pre-deoxidation.
RH is refined：Use nature decarburization in RH, 0.3 cubic metre of steel oxygen blast per ton in stove, 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, full iron+manganese oxide is 6% in slag.Calm 15 minutes upper continuous castings of molten steel.
Continuous casting：Middle bag blows roasting more than 3 hours, and centering bag carries out argon displacement before continuous casting.Big water-coating port argon envelope, middle bag use
Soaking water gap, reduce molten steel and contacted with oxygen, nitrogen.Tundish temperature control targe is：+ 20~35 DEG C of molten steel liquidus temperature.Middle bag
Free oxygen control is in below 50ppm.Casting speed is：0.5~1.5m/min.
Embodiment 6
Desulfurizing iron：In molten iron：S=0.0008%, Ti+Nb+V=0.0080% are strict to control residual elements Cu+ in steel
Ni+Cr+Mo≤0.05%.
Converter smelting：Aim carbon 0.055%, O=0.045%.Tapping temperature：1680℃；Tapping not pre-deoxidation.
RH is refined：Use nature decarburization in RH, 0.4 cubic metre of steel oxygen blast per ton in stove, 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, full iron+manganese oxide is 5% in slag.Calm 15 minutes upper continuous castings of molten steel.
Continuous casting：Middle bag blows roasting more than 3 hours, and centering bag carries out argon displacement before continuous casting.Big water-coating port argon envelope, middle bag use
Soaking water gap, reduce molten steel and contacted with oxygen, nitrogen.Tundish temperature control targe is：+ 20~35 DEG C of molten steel liquidus temperature.Middle bag
Free oxygen control is in below 50ppm.Casting speed is：0.5~1.5m/min.
Each embodiment some processes parameter and finished product silicone content are listed in the following table.
The some processes parameter of table 1 and finished product silicone content
As can be known from the above table, the finished product silicone content of each embodiment successfully solves Ultra-low carbon ultra-low silicon below 0.005%
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 decarburizations 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. the increased method of silicone content is prevented during a kind of Ultra-low carbon ultra-low silicon steel smelting, it is characterised in that：Including following step
Suddenly：
1) desulfurizing iron：Desulfurizing iron makes mass content S≤0.002% of Sulfur Content in Hot Iron, while controls 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 is controlled below 0.005%；Tapping target temperature：1680~1700 DEG C；
3) Argon：The top of the slag sheds aluminum shot 0.1~0.5kg/ ton steel, calcium carbide 0.1~0.3kg/ ton steel, by slag before RH on ladle
Iron oxide total amount is reduced to mass content below 10%, argon station soft blow 0.5~3 minute；
4) RH is refined：Decarburization, deoxidation are carried out to molten steel, control the mass content of carbon in molten steel to drop below 0.005%, free oxygen
Mass content in below 20ppm, 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 manganese mass content sum and be 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 bag use soaking water gap, reduce molten steel and are contacted with oxygen, nitrogen；Tundish temperature control targe
For：+ 20~35 DEG C of molten steel liquidus temperature；The mass content of the middle free oxygen of bag is controlled in below 50ppm；Casting speed is：0.5
~1.5m/min.
2. the increased method of silicone content, its feature are prevented during Ultra-low carbon ultra-low silicon steel smelting according to claim 1
It is：In step 3), new slag is made before Argon to ladle.
3. the increased method of silicone content, its feature are prevented during Ultra-low carbon ultra-low silicon steel smelting according to claim 1
It is：In step 4), molten steel decarburization, deoxidation concretely comprise the following steps：Using nature decarburization, furnace pressure is maintained at below 100Pa,
Carbon is taken off into mass content below 0.005%, and makes the mass content of the free oxygen in steel in below 350ppm；Again into RH stoves
Add aluminum shot deoxidation, make the mass content of free oxygen in molten steel in below 20ppm, and make the mass content of aluminium in steel 0.005%
Below.
4. according to preventing that silicone content is increased during Ultra-low carbon ultra-low silicon steel smelting according to any one of claims 1 to 3
Method, it is characterised in that：In step 4), if temperature is less than 1600 DEG C before RH stoves on molten steel, LF stove heats are first gone up to 1630
RH stoves are gone up after~1680 DEG C again.
5. according to preventing that silicone content is increased during Ultra-low carbon ultra-low silicon steel smelting according to any one of claims 1 to 3
Method, it is characterised in that：It is more already oxidised than Ti, Nb, V that aluminium is more easy to react with oxygen carbon in molten steel after RH is refined in step 4)
Into vestige, its mass content meets：Ti+Nb+V≤0.0060%, and Ti+Nb+V+Al≤0.010%.
6. according to preventing that silicone content is increased during Ultra-low carbon ultra-low silicon steel smelting according to any one of claims 1 to 3
Method, it is characterised in that：In step 5), before continuous casting, centering bag is needed to blow roasting more than 3 hours, and centering bag carries out argon displacement.
7. according to preventing that silicone content is increased during Ultra-low carbon ultra-low silicon steel smelting according to any one of claims 1 to 3
Method, it is characterised in that：In step 1), while the mass content of residual elements in steel is controlled to meet：Cu+Ni+Cr+Mo≤
0.05%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN109837361A (en) * | 2019-04-01 | 2019-06-04 | 山东钢铁集团日照有限公司 | A kind of RH simply connected technique of the anti-wadding stream of low-carbon unskilled steel |
| CN109913607A (en) * | 2019-03-13 | 2019-06-21 | 河钢股份有限公司承德分公司 | A kind of smelting process of ultra-low-carbon steel |
| CN113106187A (en) * | 2021-03-22 | 2021-07-13 | 张家港宏昌钢板有限公司 | Refining duplex production method for improving IF molten steel nozzle blockage |
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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 |
| CN109913607A (en) * | 2019-03-13 | 2019-06-21 | 河钢股份有限公司承德分公司 | A kind of smelting process of ultra-low-carbon steel |
| CN109837361A (en) * | 2019-04-01 | 2019-06-04 | 山东钢铁集团日照有限公司 | A kind of RH simply connected technique of the anti-wadding stream of low-carbon unskilled steel |
| CN113106187A (en) * | 2021-03-22 | 2021-07-13 | 张家港宏昌钢板有限公司 | Refining duplex production method for improving IF molten steel nozzle blockage |
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