CN107586919B - A kind of preparation process of Low-carbon deep drawing steel - Google Patents
A kind of preparation process of Low-carbon deep drawing steel Download PDFInfo
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- CN107586919B CN107586919B CN201710804684.4A CN201710804684A CN107586919B CN 107586919 B CN107586919 B CN 107586919B CN 201710804684 A CN201710804684 A CN 201710804684A CN 107586919 B CN107586919 B CN 107586919B
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Abstract
The present invention provides a kind of preparation processes of Low-carbon deep drawing steel, comprising: successively carries out converter smelting process, argon station process, RH refining procedure, sheet billet continuous casting process and billet rolling process；The converter smelting process control endpoint carbon content is 0.06~0.08%, and terminal 200~400ppm of oxygen content, tapping temperature is 1660~1680 DEG C.Compared with prior art, the present invention optimizes Low-carbon deep drawing steel preparation process flow, carries out further decarburization by using RH refinery practice, makes converter procedure that can avoid generating a large amount of field trash with tapping steel with high carbon.Converter tapping carbon content is relatively high in the present invention, keeps Molten Steel over-oxidation degree low, and deoxygenated alloy consumption is reduced, and molten steel recovery rate is high, and mitigates the erosion to converter lining.Preparation process provided by the invention can obtain the second best in quality Low-carbon deep drawing steel.
Description
Technical field
The present invention relates to steel technical field of smelting more particularly to a kind of preparation processes of Low-carbon deep drawing steel.
Background technique
Low-carbon deep-draw hot-rolled coil is after the techniques such as cold rolled annealed, and product has intensity high, and good toughness is easily processed into
The excellent performances such as type and good weldability, thus it is widely used in household electrical appliances, ship, automobile, bridge, building, machinery, pressure
The manufacturings such as container.
Currently, the manufacturing process of domestic each steel mill's production Low-carbon deep drawing steel is mainly include the following types: process flow 1: converter
Smelting-LF furnace-RH refining-continuous casting-steel billet is cleared up-enters furnace rolling (such as Mei Gang, horse steel etc.)；Process flow 2: turn
Furnace smelting-RH refining-LF furnace-continuous casting-steel billet is cleared up-enters furnace rolling, and (high manganese generation can be used in such technique
Cost of alloy, such as Sha Gang, ripples steel are reduced for spiegeleisen)；Process flow 3: converter smelting-LF furnace-continuous casting-steel
Furnace rolling (such as Tang Gang, Anshan iron and steel plant) is cleared up-entered to base.
Major defect existing for above-mentioned technology is that process flow is long, and the fluctuation of production technology causes steel quality unstable,
Make coil of strip peeling, pipe quality objection amount 0.5% or so, and molten steel is purified mainly by external refining, the quantity of slag is big, energy consumption is high,
Iron loss is high, at high cost, big to converter lining erosion, and CO2 emissions are high.
Summary of the invention
In view of this, simple the purpose of the present invention is to provide a kind of process flow and quality to be prepared preferably low
The preparation process of carbon deep punching steel.
The present invention provides a kind of preparation processes of Low-carbon deep drawing steel, comprising:
Successively carry out converter smelting process, argon station process, refining procedure, sheet billet continuous casting process and billet rolling process；
The converter smelting process control endpoint carbon content is 0.06~0.08%, and terminal oxygen content is 200~400ppm,
Tapping temperature is 1660~1680 DEG C.
In the present invention, the ingredient of the Low-carbon deep drawing steel is preferred are as follows:
The C of 0.007~0.030wt%；
The Si of≤0.020wt%；
The Mn of≤0.30wt%；
The P of≤0.020wt%；
The S of≤0.015wt%；
The Als (dissolved aluminum) of 0.020~0.060wt%；
The N of≤0.0040wt%；
Surplus is Fe.
In the present invention, the performance (tensile property) of the Low-carbon deep drawing steel is preferred are as follows:
Yield strength preferably≤210MPa；
Tensile strength is preferably 270~350MPa；
Elongation is preferably >=42%.
In the present invention, the converter procedure preferably uses top and bottom complex blowing technique, improves converter oxygen supply intensity, strengthens whole
The mixing effect of BOTTOM ARGON BLOWING makes end phosphorus content≤0.010%, terminal nitrogen content≤0.0015%.In the present invention, described turn
Furnaceman's sequence preferably blows the success of catch carbon, and control endpoint carbon content is 0.06-0.08%, terminal oxygen content for 200~
400ppm, tapping temperature are controlled at 1660~1680 DEG C.In the present invention, the converter procedure preferably passes through automatic Steelmaking skill
Art, the structure of optimization iron and steel stock, auxiliary material guarantee converter terminal ingredient and temperature in claimed range, continue decarburization for RH refining
Advantage is provided.In the present invention, the converter procedure tapping is preferably operated using Slag pushing-off vehicle, is reduced the lower quantity of slag, is preferably controlled
Thickness of slag layer≤50mm processed, tapping process preferably carry out alloying operation.
Due to the ability for using RH refinery practice that there is further decarburization in process flow of the invention, so converter procedure
It can avoid generating a large amount of field trash with tapping steel with high carbon.Converter tapping carbon content is relatively high in the present invention, makes Molten Steel over-oxidation
Degree is low, and deoxygenated alloy consumption is reduced, and molten steel recovery rate is high, alleviates the erosion to converter lining.
In the present invention, low alkalinity restructuring slag, the low alkalinity restructuring are preferably added in the converter procedure tapping process
The ingredient of slag preferably includes:
CaO、Al2O3And SiO2；
Mass content of the CaO in low alkalinity restructuring slag is preferably 45~50%；
The Al2O3Mass content in low alkalinity restructuring slag is preferably 20~25%；
The SiO2Mass content in low alkalinity restructuring slag is preferably 8~9%.
The low alkalinity that the present invention uses restructures slag, changes the inclusion morphology in steel, forms the folder of low melting point, high-ductility
Sundries.
In the present invention, preferably enter argon station adds aluminium powder to the argon station process, to restructure to ladle slag, reduces
The oxidisability of slag forms low alkalinity slag system, to change the form of field trash, reduces inclusion melting point, makes it have good
Plasticity.
In the present invention, the RH refining procedure, that is, molten steel vacuum circulation degassing process.The present invention preferably refines work in RH
Prepare 4 furnace straight carbon steel molten steel before sequence production and carries out circular treatment.In the present invention, preferably to steel during the RH refining procedure
Packet and refining vacuum channel carry out the pre-heat treatment, and the temperature of the pre-heat treatment is at 400 DEG C or more, to reduce the steel of ladle and refining process
Water temperature drop, to avoid heating by O2 blowing, oxide is mingled in increase steel.In the present invention, in the RH refining process preferably
Preceding progress physical and chemical index inspection is used to vacuum tank, it is preferable to use replaced after 90 times for vacuum tank.The present invention is refined using RH
Mode, RH decarburization remove the oxygen in molten steel simultaneously, and the gas of generation does not pollute molten steel, and gas eliminates steel during floating
Middle field trash, steel inclusion is few, compares compared with LF furnace, stabilizes the control of carbon content, avoids electrode carburetting.RH refining is reduced
The use of slag material reduces power consumption, and high carbon alloy can be used instead of low-carbon alloy, reduce cost of alloy.
The present invention in RH refining process jack ladle, vacuumize and be extracted into molten steel the operation recycled in vacuum tank
There is no special limitation, is operated using the operating method of those skilled in the art's routine.In the present invention, the RH
In refining process guarantee vacuum degree preferably≤67Pa, carry out quick decarburization, degassing operation；Guarantee circulation time (net circulation time)
It is preferred that > 10min removes steel grade field trash.
In the present invention, the sheet billet continuous casting process preferably uses tundish protective casting, and casting process carries out whole guarantor
Shield casting.The present invention makes casting process interval by the sealing of the sealing means and pouring basket lid of improvement tundish long nozzle
The aluminium of exhausted air better effect, casting process damages preferably≤40ppm.
In the prior art, the thermometer hole of pouring basket lid and sampling hole are designed using square hole, and the material of pouring basket lid is
Q345B, as shown in Figure 1, backpack cover is easily-deformable during long-time high-temperature baking.The present invention improves pouring basket lid, changes
Pouring basket lid thermometer hole and sampling hole after are designed using elliptical aperture, and material uses whole board making of Q235B rolling, such as
Shown in Fig. 2, this pouring basket lid pad is few, is unlikely to deform, and so that the sealing effect is better for the improvement of pouring basket lid structure, more resistance to
With.
The present invention improves the tundish long nozzle for use of casting in sheet billet continuous casting process, adopts in the prior art
Tundish long nozzle is as shown in figure 3, long nozzle sealing ring has flanging, and sealing ring is in the wrist of long nozzle.This hair
It is bright by being improved to tundish long nozzle, improved long nozzle is in such a way that argon gas combines with sealing ring sealing, band
The sealing ring of flanging can hinder the sealing effect of argon gas, and the sealing ring flanging of tundish long nozzle is cancelled and increased close by the present invention
The height of seal makes its > 0.5mm, makes sealing ring beyond long nozzle wrist, this long nozzle sealing effect is more preferable, and the present invention changes
Tundish long nozzle after is as shown in Figure 4.
The present invention makes tundish seal protection and metallurgical effect by the sealing of improvement pouring basket lid and tundish long nozzle
It is improved, the blocking for avoiding middle water containing opening causes steel inclusion in the aggregation of mouth of a river wall, pollutes molten steel.
In the present invention, the sheet billet continuous casting process is using crystallizer metallurgy and mould electromagnetic brake.The present invention is to knot
Flow field in brilliant device metallurgical process is optimized, and by the structure of change submersed nozzle, changes the temperature field in crystallizer,
Make inclusion floating to change the flow trace of molten steel and extend flowing time.
In the prior art, submersed nozzle bottom structure is " convex ", as shown in figure 5, this submersed nozzle bottom
Temperature field is as shown in Figure 6.The present invention preferably changes into submersed nozzle bottom structure " convex " " spill ", and side opening size increases
Greatly, as shown in fig. 7, the temperature field of improved submersed nozzle bottom is as shown in Figure 8.This improved immersion of the present invention
Mouth of a river bottom structure reduces the flow velocity of molten steel, mitigates impact, volume caused by the reflux shearing force for avoiding molten steel upward is excessive
The inclusion floating that slag and flow velocity promote slowly.
The present invention is further to mitigate the upward stream stock shearing force of molten steel and use mould electromagnetic brake technology and non-
Sinusoidal vibration technology carries out the improvement of electromagnetic braking and Oscilation Parameters of Mold, avoids the slag of molten steel.
In the present invention, the parameter of electromagnetic brake technology is preferred are as follows:
Operating current is preferably 570~590A, more preferably 575~585A, most preferably 580A；
Frequency is preferably 1.7~1.9Hz, more preferably 1.75~1.85Hz, most preferably 1.8Hz；
Central magnetic field intensity is preferably 590Gs~610Gs, more preferably 595~605Gs, most preferably 600Gs.
In the present invention, the parameter of mold oscillation is preferred are as follows:
C1 is preferably 1.7~1.8, and more preferably 1.75；
C2 is preferably 1.4~1.6, and more preferably 1.5；
C3 is preferably 130~140, and more preferably 135；
C4 is preferably -9~-11, more preferably -10；
C5 is preferably 0；
C6 is preferably 0.1~0.3, and more preferably 0.2.
The present invention is by obtaining molten steel stream stock to submersed nozzle+electromagnetic braking+non-sinusoidal oscillation technology improvement
Improve, reduces the subsurface inclusion and rimhole of slab, banded peeling defect occur after avoiding cold rolling.Peeling defect
Refer to the irregular Overlapping splats for being mingled with nonmetallic substance in steel, often along strip roller-way direction extend, may opening or not
Opening, seriously affects the surface quality of coil of strip after slab rolling.
Covering slag used in crystallizer metallurgical process is optimized in the present invention, by the excellent of protection slag ingredient
Change, increase the tension of liquid phase slag and molten steel surface, viscosity is properly increased to covering slag, basicity is improved, avoids slag and mention
The high ability of dross inclusion adsorption.In the present invention, the ingredient of the covering slag preferably includes:
0.38~0.42% H2O；
28~31% SiO2；
33~34% CaO；
1.6~1.7% MgO；
3.6~3.7% Al2O3；
0.4~0.5% Fe2O3；
0.3~0.4% MnO；
8~9% C.
In the present invention, the ingredient of the covering slag more preferably includes:
0.4% H2O；
29.69% SiO2；
33.55% CaO；
1.65% MgO；
3.65% Al2O3；
0.42% Fe2O3；
0.31% MnO；
8.08% C.
In the present invention, the viscosity of the covering slag is preferably 0.14~0.16Pa.S, more preferably 0.15~
0.155Pa.S, most preferably 0.153Pa.S；The fusing point of the covering slag is preferably 1100~1130 DEG C, more preferably 1115~
1125 DEG C, most preferably 1119.1 DEG C；Molten speed preferably 35~40s, the more preferably 36~38s of the covering slag, most preferably
For 37s；The basicity of the covering slag is preferably 1.1~1.2, and more preferably 1.13.
The present invention reduces slag by optimization covering slag performance, improves the effect of absorption slag inclusion.
The present invention makes field trash become lower melting point inclusion, the blocking of anti-waterstop port by above-mentioned preparation process.And this
The production technology that invention provides keeps the cleanliness of molten steel high, is mingled with few in molten steel, and has carried out in continuous casting process a series of
Above-mentioned optimization and improvement, make field trash be not easy to assemble, do not block the mouth of a river.Compared with prior art, the present invention is without carrying out calcium
Processing operation reduces costs.
The present invention does not have special limitation to the concrete operations of the billet rolling process, ripe using those skilled in the art
The billet rolling technique known rolls steel billet.
Key point of the invention is the provision of a kind of technological process of production of improved Low-carbon deep drawing steel；To converter, argon
It stands, the control of refined molten steel purification and inclusion morphology；The improvement of control mode during continuous casting protective casting；Crystallizer process
The improvement (including optimization submersed nozzle+electromagnetic braking+non-sinusoidal oscillation) of optimization；And used protection slag ingredient and reason
Change the optimization of index.The present invention is changed by the Control and Inclusion Removal process to three converter, RH refining, continuous casting processes
Into, solve short route production Low-carbon deep drawing steel quality problems, reach production cost reduce, finished product inclusion content of steel drop
Low purpose makes it meet final use demand, improves customer satisfaction.
Compared with prior art, present invention reduces the technological process of productions, alleviate converter decarburization burden, reduce refining slag
The discharge of consumption, energy consumption, carbon dioxide；By converter tapping steel with high carbon, molten steel oxidation is weak, and restructures to argon station ladle slag, changes
Slag inclusion form；Purification molten steel is controlled by RH process, the quantity of steel inclusion is reduced, guarantees the degree of purity of molten steel, weight
Anaerobic respiratory enzyme, the crystallizer of point control continuous casting process tundish use electromagnetic braking, mitigate stream stock impact, and crystallizer smoothness is excellent
Change, change MOLTEN STEEL FLOW track, and optimize to Oscilation Parameters of Mold, the optimization of crystallizer protecting residue performance fully ensures that floating
The absorption of field trash guarantees slab quality, makes that its amount of inclusions is few, size is small, fusing point is low, is evenly distributed, and prevents peeling and lacks
It falls into.Therefore, production technology provided by the invention solve traditional processing technology is at high cost, the technological process of production is long, unstable quality,
Energy consumption is high, iron loss is high, resistance to material corrodes the problems such as serious, CO2 emission is high.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the structural schematic diagram of backpack cover among the prior art；
Fig. 2 is the structural schematic diagram of the improved pouring basket lid of the present invention；
Fig. 3 is packet long nozzle material object picture among the prior art；
Fig. 4 is the improved tundish long nozzle material object picture of the present invention；
Fig. 5 is prior art submersed nozzle bottom substance schematic diagram；
Fig. 6 is the temperature field of prior art submersed nozzle bottom；
Fig. 7 is the improved submersed nozzle bottom substance schematic diagram of the present invention；
Fig. 8 is the temperature field of the improved submersed nozzle bottom of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment
The preparation of Low-carbon deep drawing steel is carried out according to following process flow:
Converter smelting → argon station (ladle slag restructuring) → refining (RH) → sheet billet continuous casting (crystallizer metallurgy+crystallizer electromagnetism
Braking) → steel billet directly enter furnace rolling.
Converter smelting process: converter uses top and bottom complex blowing, makes terminal [P]≤0.010%, terminal [N]≤0.0015% is blown
A catch carbon success is refined, controls terminal [C] content between 0.06~0.08%, terminal [O] content is in 200~400ppm, out
Steel temperature controls between 1660~1680 DEG C, by automatic Steelmaking technology, optimizes iron and steel stock, auxiliary material structure, guarantees converter
Terminal ingredient and temperature are in claimed range.Tapping is operated using Slag pushing-off vehicle, is reduced the lower quantity of slag, is controlled thickness of slag layer≤50mm,
Tapping process carries out alloying operation.
Argon station process: converter tapping process is added low alkalinity and restructures slag, and main component includes: CaO 48wt%, Al2O3
23wt%, SiO28wt%.Subsequently into argon station plus aluminium powder, the oxidisability of slag is reduced, forms low alkalinity slag system.
RH refining procedure: the preparation before carrying out production prepares 4 furnace straight carbon steel molten steel before manufacture, carries out circular treatment.It is right
Ladle and RH vacuum tank are preheated, and guarantee temperature at 400 DEG C or more, and the resistance to material of vacuum tank uses preceding progress physical and chemical index inspection,
Vacuum tank uses 90 replacements.Then jacking ladle is carried out, is vacuumized, molten steel is extracted into vacuum tank and is recycled, is guaranteed true
Reciprocal of duty cycle≤67Pa carries out quick decarburization, degassing operation, guarantees net circulation time > 10min.
Continuous casting working procedure (tundish protective casting+crystallizer metallurgy+electromagnetic braking+non-sinusoidal oscillation):
1) tundish protective casting: casting process carries out whole process protection casting, using tundish long nozzle shown in Fig. 4
Sealing means (argon gas+sealing ring sealing means, sealing ring exceed mouth of a river wrist 0.5mm without flanging, sealing ring height) carry out
Sealing is carried out close with the pouring basket lid (thermometer hole and sampling hole are designed using elliptical aperture, material Q235B) of structure shown in Fig. 2
Envelope；Aluminium damage≤40ppm of casting process.
2) using spill immersion type water nozzle structure shown in Fig. 7, (submersed nozzle bottom is with temperature field shown in Fig. 8 point
Cloth)；
3) electromagnetic brake technology parameter:
Operating current: 580A
Frequency: 1.8Hz
Central magnetic field intensity: 600Gs
4) Oscilation Parameters of Mold:
| Parameter | C1 | C2 | C3 | C4 | C5 | C6 |
| 1.75 | 1.5 | 135 | -10 | 0 | 0.2 |
5) slag ingredient and performance are protected
The Low-carbon deep drawing steel that method provided in an embodiment of the present invention is prepared detects, ingredient are as follows:
The C of 0.02wt%；The Si of 0.01wt%；The Mn of 0.2wt%；The P of 0.01wt%；The S of 0.01wt%；The Als of 0.03wt%；
The N of 0.003wt%, surplus Fe.
The Low-carbon deep drawing steel that method provided in an embodiment of the present invention is prepared carries out performance detection, and testing result is,
Yield strength is 180MPa, tensile strength 330MPa, elongation 45%.As can be seen that the embodiment of the present invention is prepared
Low-carbon deep drawing steel meet ingredient and performance requirement.
Using the online Surface testing instrument of imported from America Cognex, to the surface for the Low-carbon deep drawing steel volume that embodiment is prepared
Quality is detected, distinguishable more than 60 coil of strip surface quality defect, and testing accuracy is high, can 100% identification coil of strip peeling lack
It falls into.Testing result show the peeling quality objection of the Low-carbon deep drawing steel for using technique provided by the invention to be prepared volume for 0,
Coil of strip increased quality effect is obvious, and process provided by the invention can effectively control the quality of Low-carbon deep drawing steel, Er Qiesheng
Production. art process is short, and production cost is relatively low, energy-saving and emission-reduction.
As seen from the above embodiment, the present invention provides a kind of preparation processes of Low-carbon deep drawing steel, comprising: is successively turned
Furnace smelting procedure, argon station process, RH refining procedure, sheet billet continuous casting process and billet rolling process；The converter smelting process control
Endpoint carbon content processed is 0.06~0.08%, terminal 200~400ppm of oxygen content, and tapping temperature is 1660~1680 DEG C.With it is existing
There is technology to compare, the present invention optimizes process flow, carries out further decarburization by using RH refinery practice, makes converter
Process can avoid generating a large amount of field trash with tapping steel with high carbon.Converter tapping carbon content is relatively high in the present invention, makes molten steel mistake
Degree of oxidation is low, and deoxygenated alloy consumption is reduced, and molten steel recovery rate is high, and mitigates the erosion to converter lining.It is provided by the invention
Preparation process can obtain the second best in quality Low-carbon deep drawing steel.
Claims (6)
1. a kind of preparation process of Low-carbon deep drawing steel, specifically:
Successively carry out converter smelting process, argon station process, RH refining procedure, sheet billet continuous casting process and billet rolling process；
The converter smelting process control endpoint carbon content is 0.06~0.08%, and terminal oxygen content is 200~400ppm, tapping
Temperature is 1660~1680 DEG C；
Low alkalinity is added in the converter smelting process tapping process and restructures slag, the ingredient of the low alkalinity restructuring slag includes:
CaO、Al2O3And SiO2；
Mass content of the CaO in low alkalinity restructuring slag is 45~50%；
The Al2O3Mass content in low alkalinity restructuring slag is 20~25%；
The SiO2Mass content in low alkalinity restructuring slag is 8~9%；
The pre-heat treatment carried out to ladle and refining vacuum channel during the RH refining procedure, the temperature of the pre-heat treatment >=
400℃；
The sheet billet continuous casting process is using crystallizer metallurgy and mould electromagnetic brake；
The technical parameter of the mould electromagnetic brake are as follows:
Operating current are as follows: 570~590A；
Frequency are as follows: 1.7~1.9Hz；
Central magnetic field intensity are as follows: 590Gs~610Gs；
Oscilation Parameters of Mold in the sheet billet continuous casting process are as follows:
C1 are as follows: 1.7~1.8；
C2 are as follows: 1.4~1.6；
C3 are as follows: 130~140；
C4 are as follows: -9~-11；
C5 are as follows: 0；
C6 are as follows: 0.1~0.3.
2. preparation process according to claim 1, which is characterized in that the converter smelting process control end phosphorus content≤
0.010%, terminal nitrogen content≤0.0015%.
3. preparation process according to claim 1, which is characterized in that vacuum degree during the RH refining procedure≤
67Pa, circulation time > 10min.
4. preparation process according to claim 1, which is characterized in that the sheet billet continuous casting process is poured using tundish protection
Casting, casting process carry out whole process protection；
The thermometer hole and sampling hole for the pouring basket lid that the tundish protective casting uses design for elliptical aperture, the material of pouring basket lid
Matter is Q235B steel.
5. preparation process according to claim 4, which is characterized in that the tundish that the tundish protective casting uses is long
The sealing ring at the mouth of a river is without flanging and the height > 0.5mm of sealing ring.
6. preparation process according to claim 1, which is characterized in that the protection used in the sheet billet continuous casting process
The ingredient of slag includes:
0.38~0.42% H2O；
28~31% SiO2；
33~34% CaO；
1.6~1.7% MgO；
3.6~3.7% Al2O3；
0.4~0.5% Fe2O3；
0.3~0.4% MnO；
8~9% C.
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