CN108018403A - A kind of method of thin-slab caster production automobile using extra-deep drawing steel - Google Patents
A kind of method of thin-slab caster production automobile using extra-deep drawing steel Download PDFInfo
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- CN108018403A CN108018403A CN201711378715.0A CN201711378715A CN108018403A CN 108018403 A CN108018403 A CN 108018403A CN 201711378715 A CN201711378715 A CN 201711378715A CN 108018403 A CN108018403 A CN 108018403A
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- steel
- stoves
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- thin
- deep drawing
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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
- C21C7/064—Dephosphorising; Desulfurising
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
-
- 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
-
- 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
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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
-
- 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
- C21C2007/0093—Duplex process; Two stage processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention provides a kind of method of thin-slab caster production automobile using extra-deep drawing steel, comprises the following steps：Molten iron pre-processes, pneumatic steelmaking, LF stoves refine, the vacuum refining of RH stoves and sheet blank continuous casting, it is 3.5~4 to control converter finishing slag basicity, the percentage by weight of FeO+MnO in LF stove slags is controlled to be less than 3%, the outbound preceding liquid steel temperature of LF stoves is controlled to be not less than 1680 DEG C, calcium iron wire is fed into molten steel and carry out the weak stirring of Argon in RH stoves, weak mixing time is not less than 8min, finally use conticaster continuous-casting sheet billet of the specifications section for 135mm × 1500mm, and casting speed during continuous casting is 0.8~1.3m/min, using molding casting, so as to which the present invention can effectively solve the problem that the nozzle blocking problem occurred in existing thin slab casting.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, more particularly to a kind of thin-slab caster production automobile using extra-deep drawing steel
Method.
Background technology
It is in the situation risen increasingly to the demand of automotive sheet with flourishing for auto manufacturing of China, automobile
Vehicle body is developed into the ultra low carbon steel slab of overshoot rank with steel by the low carbon steel plate of the past low group of drawing, and surface state is then by single
Bare board develops into various plating, hot dip, Composite Coatings steel plate etc., and the use ratio on vehicle body increases year by year.Due to automobile
Enterprise's overall technology, equipment and management development can be driven with the research and development of extra-deep drawing steel, production.Therefore, automobile using surpasses
Deep punching steel becomes the prior development direction of major steel enterprise plate product.In recent years, thin slab continuous casting and rolling is produced as high added value
The production technology rapid development of product, and significant challenge is formed to conventional flat material production technology in the world.Due to thin plate
The slab thickness of billet continuous casting machine production is 70~80mm, the slit size and dimension of submersed nozzle is limited, in identical molten steel
The probability that nozzle blocking occurs in the case of cleanliness factor is bigger than traditional Plate production.Compared with conventional plate blank conticaster,
Casting billet surface product volume ratio increase, field trash easily combine in surface or the subsurface of strand, are easily formed in cold rolling plate surface
Sliver defects and crackle.These problems seriously constrain exploitation of the bar strip continuous casting and rolling flow path to high quality cold rolled sheet.
The content of the invention
In view of this, the embodiment provides a kind of process characteristic for thin-slab caster and its to cleaning
The method of the thin-slab caster production automobile using extra-deep drawing steel of the requirement of degree.
The embodiment of the present invention provides a kind of method of thin-slab caster production automobile using extra-deep drawing steel, including following step
Suddenly：
1) molten iron pre-processes：Molten iron, which is stirred, using mechanical mixing method makes molten iron produce vortex, while adds desulfurization
Agent makes it be involved in inside molten iron and fully be reacted, and the percentage by weight to Sulfur Content in Hot Iron is down to less than 0.005%；
2) pneumatic steelmaking：Molten iron in step 1) is poured into converter, appropriate slag making materials is added, is then blown into furnace
Enter the high pressure oxygen that purity is more than or equal to 99.99%, it is 3.5~4 to control converter finishing slag basicity, and converter tapping uses pushing off the slag
Operation, thickness of slag layer≤50mm in ladle, when tapping 1/2, add conditioning agent lime and fluorite to dilute unstable oxidation in slag
Thing, treats that tapping finishes backward slag blanket input aluminum shot and carries out just deoxidation, the percentage by weight of component is in blowing end point molten steel：[C]：
0.04~0.06%, [S]：0.008~0.012%, [O]：0.05~0.07%；
3) LF stoves refine：Molten steel in step 2) is sent to LF stoves, bottom electrode heating, controls outbound preceding liquid steel temperature not low
In 1680 DEG C, appropriate modification agent is added into molten steel and aluminium skimmings modify slag, control the weight hundred of FeO+MnO in slag
Divide than being less than 3%；
4) RH stoves vacuum refining：Molten steel in step 3) is sent to RH stoves, it is quick to reduce the pressure of vacuum chamber, and blow in time
Oxygen carries out decarburization to steel, and carbon content control is after 0.0015% ± 0.001%, RH stoves break and vacate station after decarburization, to molten steel
Middle feeding calcium iron wire simultaneously carries out the weak stirring of Argon, and weak mixing time is not less than 8min；
5) sheet blank continuous casting：Conticaster specifications section 135mm × 1500mm, casting speed are 0.8~1.3m/min, are used
Molding casting.
Further, the desulfurizing agent is active lime and fluorite mixture, and desulfurizing agent addition is 8~10kg/t iron
Water.
Further, the slag making materials is the mixture of active lime, light dolomite and fluorite.
Further, the modification agent is：CaO：5~20%, Al2O3：20~60%, SiO2：8~12%, Al：10~
30%, the granularity of the modification agent is 5~20mm.
Further, in step 4), calcium iron wire is fed into molten steel to molten steel progress Calcium treatment, makes the aluminium oxide in molten steel
Field trash is changed into spherical Ca-Al-Ti-O systems complex inclusion.
Further, in step 5), duration of pouring interval is controlled since RH stoves are outbound to ladle to be not less than 20min, with
Ensure that inclusion content in melting steel there are enough floating interval of floating docks.
Further, molten steel is reduced using ladle long nozzle argon gas-sealed, tundish immersed nozzle argon gas-sealed
Secondary oxidation.
The beneficial effect brought of technical solution that the embodiment of the present invention provides is：Thin-slab caster using the present invention
The sheet billet of the method production of production automobile using extra-deep drawing steel is only the half of conventional plate blank conticaster thickness, tight with flow
Gather, the advantage such as small investment, energy consumption are low.The present invention can realize the large-scale industrial production of automobile using extra-deep drawing steel, steel plate
Study and point meet technological requirement, cold rolling finished product has excellent deep drawability.The method of this production automobile using extra-deep drawing steel can
Equipment investment is saved, reduces process energy consumption, improves thin slab continuous casting and rolling value-added content of product.
Brief description of the drawings
Fig. 1 is one flow chart of method of thin-slab caster production automobile using extra-deep drawing steel of the present invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is further described.
Please refer to Fig.1, the embodiment provides a kind of side of thin-slab caster production automobile using extra-deep drawing steel
Method, comprises the following steps：
1) molten iron pre-processes：Molten iron, which is stirred, using mechanical mixing method makes molten iron produce vortex, while adds desulfurization
Agent makes it be involved in inside molten iron and fully be reacted, and the percentage by weight to Sulfur Content in Hot Iron is down to less than 0.005%.
In above-mentioned steps 1) in, the desulfurizing agent is active lime and fluorite mixture, and wherein active lime proportion is
1.0t/m3, fluorite proportion is 1.6t/m3.And the active lime index in the desulfurizing agent is：CaO>88%, S<0.20%, burn
Damage≤2%, activity degree >=320ml, granularity accounts for more than 80% between 0.2~1.8mm, less than 0.2mm and equal more than 1.8mm<
10%.Fluorite index in the desulfurizing agent is：Content>75%, SiO2<4%, S<0.2%, H2O<1%, granularity 0.2~
More than 80% is accounted between 1.8mm, it is less than 0.2mm and equal more than 1.8mm<10%.Desulfurizing agent addition is 8~10kg/t molten iron.
2) pneumatic steelmaking：Molten iron in step 1) is poured into converter, appropriate slag making materials is added, is then blown into furnace
Enter the high pressure oxygen that purity is more than or equal to 99.99%, to improve decarburizing reaction speed, shorten smelting cycle, control converter
Finishing slag basicity is 3.5~4, and converter tapping is operated using pushing off the slag, thickness of slag layer≤50mm in ladle, and when tapping 1/2 adds adjusting
Agent lime and fluorite dilute unstable oxide in slag, treat that tapping finishes backward slag blanket input aluminum shot and carries out just deoxidation, blowing
The percentage by weight of component is in endpoint molten steel：[C]：0.04~0.06%, [S]：0.008~0.012%, [O]：0.05~
0.07%.
In above-mentioned steps 2) in, the slag making materials is the mixture of active lime, light dolomite and fluorite, wherein,
Active lime proportion in the slag making materials is 1.0t/m3, light dolomite proportion is 1.6t/m3, fluorite proportion is 1.6t/
m3.Tap 1/2 when lime addition be 2.5kg/t, the addition of fluorite is 0.8kg/t.
3) LF stoves refine：Molten steel in step 2) is sent to LF stoves, bottom electrode heating, controls outbound preceding liquid steel temperature not low
In 1680 DEG C, appropriate modification agent is added into molten steel and aluminium skimmings modify slag, control the weight hundred of FeO+MnO in slag
Divide than being less than 3%.
In above-mentioned steps 3) in, the modification agent is：CaO：5~20%, Al2O3：20~60%, SiO2：8~12%,
Al：10~30%, the granularity of the modification agent is 5~20mm.The modification agent can generate fusing point is not high, mobility is moderate,
Easily form the slag system based on calcium aluminate of foam.In the refining of LF stoves, be conducive to improve LF stoves programming rate and shorten essence
The time is refined, while also reduces the oxidisability of clinker, promotes the desulfurization of molten steel, modification agent addition is 1.5kg/t.The aluminium
Bits can make the further deoxidation of clinker.
4) RH stoves vacuum refining：Molten steel in step 3) is sent to RH stoves, it is quick to reduce the pressure of vacuum chamber, and blow in time
Oxygen carries out decarburization to steel, and carbon content control is after 0.0015% ± 0.001%, RH stoves break and vacate station after decarburization, to molten steel
Middle feeding calcium iron wire simultaneously carries out the weak stirring of Argon, and weak mixing time is not less than 8min.
In above-mentioned steps 4) in, calcium iron wire is fed into molten steel to molten steel progress Calcium treatment, presss from both sides the aluminium oxide in molten steel
Debris is changed into spherical Ca-Al-Ti-O systems complex inclusion.The contact angle of this Ca-Al-Ti-O systems complex inclusion and molten steel
It is smaller, therefore the field trash is not easy to be adhered to conticaster submersed nozzle surface, so that the probability drop of nozzle blocking occurs
It is low.In the weak stirring of Argon, argon flow amount is not to blow out exposed liquid level as the upper limit.
5) sheet blank continuous casting：Conticaster specifications section 135mm × 1500mm, casting speed are 0.8~1.3m/min, are used
Molding casting.
In above-mentioned steps 5) in, control since RH stoves are outbound to ladle duration of pouring interval to be not less than 20min, to ensure
Inclusion content in melting steel has enough floating interval of floating docks.Then the molten steel in ladle is poured into tundish, in order to reduce the secondary of molten steel
Oxidation, using ladle long nozzle argon gas-sealed, tundish immersed nozzle argon gas-sealed, and the tundish using low-carbon alkalescence
Cylinder-packing and coverture, the effect of the coverture are mainly adiabatic heat-insulation, reduce Metal in Tundish temperature drop in casting process, prevent
Field trash separated in secondary oxidation of steel and absorption molten steel etc..Its main component is CaO, SiO2、MgO、Al2O3.Cause
Smelting molten steel is Ultra-low carbon steel grade, therefore can be to avoid resistance to material to molten steel recarburization using low-carbon alkalescence cylinder-packing.Finally again by centre
Molten steel is assigned in each crystallizer by water-coating port, and crystallizer is the molten steel accepted from tundish injection and is allowed to disconnected by regulation
Face shape is frozen into firm green shell, and crystallizer uses low-carbon high-viscosity covering slag.
The beneficial effect brought of technical solution that the embodiment of the present invention provides is：Thin-slab caster using the present invention
The sheet billet of the method production of production automobile using extra-deep drawing steel is only the half of conventional plate blank conticaster thickness, tight with flow
Gather, the advantage such as small investment, energy consumption are low.The present invention can realize the large-scale industrial production of automobile using extra-deep drawing steel, steel plate
Study and point meet technological requirement, cold rolling finished product has excellent deep drawability.The method of this production automobile using extra-deep drawing steel can
Equipment investment is saved, reduces process energy consumption, improves thin slab continuous casting and rolling value-added content of product.
Herein, the involved noun of locality such as forward and backward, upper and lower is to be located at parts in attached drawing in figure and zero
Part mutual position defines, only for the purpose of expressing the technical solution clearly and conveniently.It should be appreciated that the noun of locality
Use should not limit the claimed scope of the application.
In the case where there is no conflict, the feature in embodiment and embodiment herein-above set forth can be combined with each other.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on, should all be included in the protection scope of the present invention.
Claims (7)
- A kind of 1. method of thin-slab caster production automobile using extra-deep drawing steel, it is characterised in that：Comprise the following steps：1) molten iron pre-processes：Molten iron, which is stirred, using mechanical mixing method makes molten iron produce vortex, while adds desulfurizing agent and make It is involved in inside molten iron and is fully reacted, and the percentage by weight to Sulfur Content in Hot Iron is down to less than 0.005%；2) pneumatic steelmaking：Molten iron in step 1) is poured into converter, adds appropriate slag making materials, is then blown into furnace pure High pressure oxygen of the degree more than or equal to 99.99%, it is 3.5~4 to control converter finishing slag basicity, and converter tapping is grasped using pushing off the slag To make, thickness of slag layer≤50mm in ladle, when tapping 1/2, adds conditioning agent lime and fluorite to dilute unstable oxide in slag, Treat that tapping finishes backward slag blanket input aluminum shot and carries out just deoxidation, the percentage by weight of component is in blowing end point molten steel：[C]： 0.04~0.06%, [S]：0.008~0.012%, [O]：0.05~0.07%；3) LF stoves refine：Molten steel in step 2) is sent to LF stoves, bottom electrode heating, controls outbound preceding liquid steel temperature to be not less than 1680 DEG C, appropriate modification agent is added into molten steel and aluminium skimmings modify slag, control the weight percent of FeO+MnO in slag Than less than 3%；4) RH stoves vacuum refining：Molten steel in step 3) is sent to RH stoves, the quick pressure for reducing vacuum chamber, and oxygen blast pair in time Steel carries out decarburization, and carbon content control is fed after 0.0015% ± 0.001%, RH stoves break and vacate station into molten steel after decarburization Enter calcium iron wire and carry out the weak stirring of Argon, weak mixing time is not less than 8min；5) sheet blank continuous casting：Conticaster specifications section 135mm × 1500mm, casting speed is 0.8~1.3m/min, using protection Cast.
- 2. the method for thin-slab caster production automobile using extra-deep drawing steel as claimed in claim 1, it is characterised in that：It is described de- Sulphur agent is active lime and fluorite mixture, and desulfurizing agent addition is 8~10kg/t molten iron.
- 3. the method for thin-slab caster production automobile using extra-deep drawing steel as claimed in claim 1, it is characterised in that：It is described to make Residue material is the mixture of active lime, light dolomite and fluorite.
- 4. the method for thin-slab caster production automobile using extra-deep drawing steel as claimed in claim 1, it is characterised in that：It is described to change Matter agent is：CaO：5~20%, Al2O3：20~60%, SiO2：8~12%, Al：10~30%, the granularity of the modification agent is 5 ~20mm.
- 5. the method for thin-slab caster production automobile using extra-deep drawing steel as claimed in claim 1, it is characterised in that：Step 4) In, calcium iron wire is fed into molten steel to molten steel progress Calcium treatment, the aluminate in molten steel is changed into spherical Ca-Al- Ti-O systems complex inclusion.
- 6. the method for thin-slab caster production automobile using extra-deep drawing steel as claimed in claim 1, it is characterised in that：Step 5) In, control since RH stoves are outbound to ladle duration of pouring interval to be not less than 20min, to ensure that it is enough that inclusion content in melting steel has Floating interval of floating dock.
- 7. the method for thin-slab caster production automobile using extra-deep drawing steel as claimed in claim 6, it is characterised in that：Using steel Bag long nozzle argon gas-sealed, tundish immersed nozzle argon gas-sealed reduce the secondary oxidation of molten steel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711378715.0A CN108018403A (en) | 2017-12-19 | 2017-12-19 | A kind of method of thin-slab caster production automobile using extra-deep drawing steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711378715.0A CN108018403A (en) | 2017-12-19 | 2017-12-19 | A kind of method of thin-slab caster production automobile using extra-deep drawing steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115305314A (en) * | 2022-08-18 | 2022-11-08 | 日照钢铁控股集团有限公司 | LF-RH duplex ultra-low carbon steel production method for thin slab continuous casting and rolling production line |
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| CN101941021A (en) * | 2010-08-13 | 2011-01-12 | 济南钢铁股份有限公司 | Method for producing extra-deep drawing cold-rolled steel plate based on ASP process |
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| CN115305314A (en) * | 2022-08-18 | 2022-11-08 | 日照钢铁控股集团有限公司 | LF-RH duplex ultra-low carbon steel production method for thin slab continuous casting and rolling production line |
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Application publication date: 20180511 |
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