CN110016533A - The production technology of high-quality filter steel substrate - Google Patents

The production technology of high-quality filter steel substrate Download PDF

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Publication number
CN110016533A
CN110016533A CN201910191315.1A CN201910191315A CN110016533A CN 110016533 A CN110016533 A CN 110016533A CN 201910191315 A CN201910191315 A CN 201910191315A CN 110016533 A CN110016533 A CN 110016533A
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temperature
steel
time
molten steel
tapping
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CN110016533B (en
Inventor
马德刚
李经哲
李波
王耐
路博勋
尹宽
王建兴
杨杰
田俊强
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Tangshan Iron And Steel Group High Strength Automobile Plate Co Ltd
Tangshan Iron and Steel Group Co Ltd
HBIS Co Ltd Tangshan Branch
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Tangshan Iron And Steel Group High Strength Automobile Plate Co Ltd
Tangshan Iron and Steel Group Co Ltd
HBIS Co Ltd Tangshan Branch
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    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • 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
    • 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
    • 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
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium

Abstract

The invention discloses a kind of production technologies of high-quality filter steel substrate comprising desulfurizing iron, converter smelting, RH processing, middle sheet billet continuous casting, heating of plate blank and hot-rolled process；The desulfurizing iron process: desulfurizing iron to S≤0.005%；The converter smelting process, finishing slag basicity is 3.5~4.5, C 0.020%~0.045%, S≤0.010%, P≤0.010% in tapping molten steel, outlet temperature >=1690 DEG C, terminal oxygen position is controlled in 500~900ppm, molten steel sample is not taken after converter catch carbon, rear direct tapping is stirred by force in bottom blowing, time >=3 minute of tapping；The RH treatment process, using deep decarburization mode, decarburization time >=14min, RH blowing oxygen quantity control≤100m3, vacuum cycle time >=8min after alloy is added.This controlling of production process is stablized, and molten steel total oxygen and nitrogen content can be effectively controlled；Hot rolling surface defect is reduced, and the control of hot-rolled substrate inclusion behavior B type impurity is being carefully 1.5 grades or less.

Description

The production technology of high-quality filter steel substrate
Technical field
The invention belongs to Ferrous Metallurgy technology field, especially a kind of production work of high-quality filter steel substrate Skill.
Background technique
Automobile filter carries out deep-draw processing with steel raw material using cold-rolling deep-punching with steel, and most thin position can reach 0.4mm Hereinafter, as steel grade inclusion size is excessive and sand holes defect, therefore such excessively easily occurs in punching press thinning process in quantity Steel grade is more stringent to the control of field trash.The composition of filter steel mostly uses Ultra-low carbon steel grades at present, and the trade mark is SPHETi, composition range are following (wt): C≤0.01%, Si≤0.80%, Mn≤0.30%, P≤0.012%, S≤ 0.012%, Alt >=0.020%, Ti >=0.030%, surplus are Fe and inevitable impurity.
Ultra-low carbon steel-smelting production process mainly has: desulfurizing iron → converter → RH → continuous casting → heating of plate blank → roughing → essence It rolls → batches.It is recognized in the art that: ultra-low-carbon steel is aluminium deoxidation steel grade, and aluminium deoxidation steel inclusion shape in steel making working procedure At, and be present among slab, with the reduction of thickness after hot rolling, cold rolling, large-sized inclusions are easy subcutaneous in stock chart Layer stops, and filter is further thinned with thickness of the steel in user's deep-draw process, therefore large inclusions cause The probability of the defect of sand holes increases very much, sand holes defect easily occurs.
Filter is how to effectively reduce the quantity and size of steel inclusion with the Major Difficulties of base steel sheet, guarantees heat It rolls, the stabilization of cold rolling, so that sand holes defect will not be caused after user's punching press in filter steel.In particular by 100t Converter and the middle slab caster to match production filter steel are even more extremely difficult, because BOF nominal capacity is small, whole The molten steel temperature drop of a steel making working procedure is not easy to control, and RH process is easy oxygen blast, along with the pollution of Bao Naicai in continuous casting, control control The cleanliness of filter steel is challenging, innovative work.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of high-quality filter steel substrates that product cleannes are high Production technology.
In order to solve the above technical problems, the technical solution used in the present invention is: it include desulfurizing iron, converter smelting, RH processing, middle sheet billet continuous casting, heating of plate blank and hot-rolled process；The desulfurizing iron process: desulfurizing iron to S≤0.005%；Institute State converter smelting process, finishing slag basicity is 3.5~4.5, C 0.020%~0.045%, S≤0.010%, P in molten steel of tapping≤ 0.010%, outlet temperature >=1690 DEG C, terminal oxygen position control does not take molten steel sample, bottom blowing after 500~900ppm, converter catch carbon Rear direct tapping is stirred by force, time >=3 minute of tapping；The RH treatment process, using deep decarburization mode, decarburization time >=14min, RH blowing oxygen quantity control≤100m3, vacuum cycle time >=8min after alloy is added, C≤0.0030% in the outbound molten steel of RH, Mn 0.10%~0.20%, Si≤0.010%, S≤0.012%, P≤0.012%, Als 0.030%~0.050%, Ti 0.050%~0.070%, N≤0.0035%, O≤0.0020%；The middle sheet billet continuous casting process, molten steel in bakie in continuous casting temperature 1559~1579 DEG C of degree, baking of tundish temperature >=1100 DEG C, baking time >=3 hour, secondary cooling use and Dynamic Light pressure Under the refrigerating mode that combines, straightening temperature >=900 DEG C；The heating of plate blank process, heating temperature are 1150~1310 DEG C, are stayed The furnace time controls in 100~180min；The hot-rolled process, roughing mill speed >=1.0m/s, the finishing temperature of finish rolling are 890 ~930 DEG C.
Crystallizer uses ultra-low-carbon steel mold powder in middle sheet billet continuous casting process of the present invention, wherein C 3~8%, SiO2 24~35%, CaO 25~40%, Al2O32~6%, fusing point is 1100 ± 50 DEG C, and viscosity is 0.5~2.5 pool.
Middle sheet billet continuous casting process of the present invention, O≤25ppm, N≤40ppm in slab.
Roughing operation of the present invention, using reciprocal 5 passes of reversible mill.
The present invention is using 100t converter and the middle slab caster to match.
The beneficial effects of adopting the technical scheme are that controlling of production process of the present invention is stablized, it can be effective Control molten steel total oxygen and nitrogen content；Hot rolling surface defect is reduced, and the control of hot-rolled substrate inclusion behavior B type impurity is carefully being 1.5 grades hereinafter, field trash tissue grading detection method reference standard GB/T10561-2005 " nonmetallic inclusionsin steel content Measure Standard rating chart microscopy ", to hot-rolled substrate using light microscopic carry out quantity detection, and using Electronic Speculum carry out size and Constituent analysis.The middle sheet billet continuous casting and controlling hot rolling technology production high-quality filter that the present invention is matched using 100 tons of converters With steel substrate, by controlling each process technological parameter, to produce the continuous casting billet met the requirements, hot rolling produces high-quality hot-rolled coil, Through the high-quality cold-rolled products of cold rolling final production.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the steel substrate light microscopic figure (× 100 times) that embodiment 1 produces；
Fig. 2 is the steel substrate light microscopic figure (× 100 times) that embodiment 2 produces；
Fig. 3 is the steel substrate light microscopic figure (× 100 times) that embodiment 3 produces；
Fig. 4 is the steel substrate light microscopic figure (× 100 times) that embodiment 4 produces；
Fig. 5 is the steel substrate light microscopic figure (× 100 times) that embodiment 5 produces；
Fig. 6 is the steel substrate light microscopic figure (× 100 times) that embodiment 6 produces；
Fig. 7 is the steel substrate light microscopic figure (× 100 times) that embodiment 7 produces；
Fig. 8 is the steel substrate light microscopic figure (× 100 times) that embodiment 8 produces；
Fig. 9 is the steel substrate light microscopic figure (× 100 times) that embodiment 9 produces.
Specific embodiment
The process flow of the production technology of this high-quality filter steel substrate are as follows: at desulfurizing iron → converter smelting → RH Reason → middle sheet billet continuous casting → reconditioning → heating of plate blank → roughing → finish rolling → is batched；Using converter 100t；RH refines 100t；Middle plate Base continuous casting (no electromagnetic agitation), using dynamic soft-reduction；Hot rolling uses heat accumulating type walking beam bar plate heating stove；4 roller of reversible is thick Milling train, 7 frame mm finishing mill units produce steel grade SPHETi steel；Technical process is as described below.
(1) desulfurizing iron: after ladle is blown magnesium powder and lime desulfurization, molten iron surface bits are scratched clean, after desulfurization S≤0.005wt% in molten iron.
(2) converter smelting: use 100t converter, enter furnace molten iron temperature >=1280 DEG C, enter C 3.9% in furnace molten iron~ 4.1%, S≤0.005%, P≤0.130%；The finishing slag basicity of converter smelting is 3.5~4.5；Converter uses automatic steelmaking model It smelts；Endpoint molten steel controls 0.020~0.045wt% of C, S≤0.010wt%, P≤0.010wt%；Outlet temperature >=1690 DEG C, terminal oxygen position is controlled in 500~900ppm；Molten steel sample is not taken after catch carbon, revolving furnace body angle restores 0 °, and bottom blowing is stirred by force 120~140S, bottom blowing intensity are 0.15~0.18m3/ t*min stirs by force rear direct tapping；Tapping time >=3 minute；Use steel Packet is turnover class ladle；Slide plate front, slag retaining cone and slide plate rear slag stopping are used in tapping process；Tapping process is without alloy Change, tap molten steel 1/3 when be initially added into lime, 3.5~4.0kg/ tons of steel of lime adding amount.Lime closes ladle after being added Bottom blowing.Modification agent is added after tapping and carries out slag modification, modification agent additional amount is the every furnace of 100~200kg/.
(3) RH is handled: the deep decarburization mode of RH use, decarburization time >=14min, and molten steel oxygen position controls after decarburization time In 250~400ppm.Minimum vacuum degree control is in 0.5~2mbar；RH blowing oxygen quantity≤100Nm3.Alloying sequence: in aluminium deoxidation It uses manganese metal to match manganese after terminating 6~8min, matches titanium, alloy addition sequence manganese metal → ferrotianium using ferrotianium, alloy has been added Vacuum cycle time >=8min after finishing.Time control to be poured is in 20~25min.Molten steel of tapping controls (wt) C≤0.0030%, Mn 0.10%~0.20%, Si≤0.010%, S≤0.012%, P≤0.012%, Als 0.030%~0.050%, Ti 0.050%~0.070%, N≤0.0035%, O≤0.0020%；RH out-station temperature according to casting blank section and even pour heat and It is fixed, specifically it is shown in Table 1.
Table 1:RH out-station temperature
Section, mm It opens and pours the first furnace, DEG C Company pours, DEG C
≤1050 1616~1631 1600~1615
> 1050 1616~1631 1595~1610
(4) sheet billet continuous casting in: 1559~1579 DEG C of molten steel in bakie in continuous casting temperature, baking of tundish temperature >=1100 DEG C, Baking time >=3 hour, secondary cooling use the refrigerating mode combined with dynamic soft-reduction, straightening temperature >=900 DEG C；It is different The casting speed control of casting blank section is shown in Table 2；Using carbon-free low silicon coverture, crystallizer uses ultra-low-carbon steel mold powder.
Table 2: pulling speed of continuous casting and casting blank section corresponding relationship
Section, mm Pulling rate, m/min
≤1050 1.40~1.60
> 1050 1.30~1.50
Contents of Main Components is (wt): C 3~8%, SiO in the ultra-low-carbon steel mold powder224~35%, CaO 25 ~40%, Al2O32~6%, fusing point is 1100 ± 50 DEG C, and viscosity is 0.5~2.5 pool.
The middle sheet billet continuous casting process, tundish use slag blocking wall, slag weir；Tundish uses magnesium refractory, aluminium carbonaceous Filling pipe end, aluminium carbonaceous stopper and submersed nozzle, the resistance to material of tundish are built using coating.Ladle uses long nozzle to tundish Argon gas-sealed is added to protect molten steel.
The chemical composition ranges of gained slab be (wt): C≤0.003%, Si≤0.010%, Mn0.10%~0.20%, P≤0.012%, S≤0.012%, Als 0.030%~0.050%, Ti0.050%~0.070%, N≤0.0040%, O≤ 0.0025%, remaining ingredient is iron and inevitable impurity.
(5) machine reconditioning and gas flame cuttiug reconditioning: are carried out using sharpening machine, it is desirable that slab upper and lower surface machine removing 2~ 4mm, slab corner carry out 2~4mm of gas flame cuttiug.
(6) heating of plate blank: heating temperature is 1150~1310 DEG C, and the time in furnace controls in 100~180min.
(7) hot rolling: the start rolling temperature of roughing is controlled at 1100 ± 20 DEG C, using reciprocal 5 passes of reversible mill, often De-scaling is carried out before passes, and requires mill speed >=1.0m/s of roughing；The control of roughing total reduction is >=80%.
Finish rolling entrance de-scaling water pressure >=25Mpa；1005~1090 DEG C of entry temperature at finishing, finishing temperature is 890~930 DEG C, the control of finish rolling total reduction is >=85%, and finished product thickness is 2.0~5.0mm.
In coiling process, 700~740 DEG C of coiling temperature；The filter steel substrate can be obtained after batching.
(8) it is being carefully 1.5 grades or less that the observation of substrate field trash obtained by above method grade, which is the control of B type impurity,.
Embodiment 1: the production technology of this high-quality filter steel substrate is described in detail below.
(1) desulfurizing iron: the molten iron S after desulfurization is 0.005wt%.
(2) converter smelting: entering 1350 DEG C of furnace molten iron temperature, enters C 4.1% in furnace molten iron, S0.005%, P 0.110%； Finishing slag basicity R is 3.95, ingredient in molten steel of coming out of the stove: C 0.045%, S 0.009%, P 0.009%, O 680ppm；Terminal temperature 1705 DEG C of degree.Bottom blowing is stirred by force 120 seconds after catch carbon, bottom blowing flow 0.18m3/ t*min stirs by force rear direct tapping, and the tapping time 3 divides Clock.Lime is initially added into when tapping molten steel 1/3, amount of lime is 3.5kg/ tons of steel；Ladle bottom blowing argon gas is closed after tapping, is added Enter modification agent 100kg.
(3) RH is handled: using deep decarburization mode, minimum vacuum degree is 2.0mbar, decarburization time 14min.RH blowing oxygen quantity 50Nm3.After decarburization time, molten steel oxygen position is 400ppm, and aluminum shot is added and carries out deoxidation, recycles 6 minutes, makes after deoxidation Match titanium, alloy addition sequence manganese metal → ferrotianium, vacuum cycle time 8min after alloying with manganese, using ferrotianium with manganese metal. The outbound molten steel composition of RH is shown in Table 3, and out-station temperature is 1631 DEG C, and the furnace time to be poured is 25min.
(4) sheet billet continuous casting in: heat is to open to pour the first furnace, casting blank section 1050mm.Tundish temperature and degree of superheat control 4 are shown in Table, the Contents of Main Components of ultra-low-carbon steel mold powder is shown in Table 5, and continuous casting billet ingredient is shown in Table 6；Secondary cooling uses and Dynamic Light The refrigerating mode that pressure combines, 900 DEG C of straightening temperature, casting speed control 1.6m/min；It 1100 DEG C of baking of tundish temperature, dries Roasting time 3h.
(5) reconditioning process: slab upper and lower surface reconditioning 4mm, slab corner carries out cleaning 4mm.
(6) heating process: for heating of plate blank to 1290 ± 20 DEG C, the time in furnace is 100min.
(7) hot-rolled process: the start rolling temperature control of roughing is at 1100 ± 20 DEG C, and roughing reduction ratio is 80%, roughing belt speed For 1.0m/s；1025 ± 20 DEG C of finish rolling start rolling temperature (entry temperature at finishing), finish rolling reduction ratio are 85%, finish rolling entrance de-scaling water Pressure 25Mpa, finishing temperature are 900 ± 10 DEG C；Coiling temperature is 720 ± 10 DEG C, and rolled plate is with a thickness of 5.0mm.
(8) after Plate Production, field trash grade and quantity are observed.Individual particle field trash is found at the wide a quarter of plate, It is 1 μm wide, belong to B type impurity, quantity 3 is shown in Fig. 1.The present embodiment controlling of production process is stablized, gained filter steel substrate Quality it is preferable, molten steel in bakie in continuous casting oxygen mass fraction control be 25ppm, nitrogen content control be 40ppm, hot-strip Field trash grade B class is carefully 0.5, through the high-quality cold-rolled products of cold rolling final production.
Embodiment 2: the production technology of this high-quality filter steel substrate is described in detail below.
(1) desulfurizing iron: the molten iron S after desulfurization is 0.003wt%.
(2) converter smelting process: entering 1300 DEG C of furnace molten iron temperature, enters C 4.0% in furnace molten iron, S 0.003%, P 0.120%；Finishing slag basicity R is 3.50, ingredient in molten steel of coming out of the stove: C 0.020%, S 0.008%, P 0.010%, O 720ppm；1690 DEG C of outlet temperature.After stirring 140 seconds by force after catch carbon, bottom blowing flow 0.15m3/ t*min stirs by force rear direct tapping, The tapping time 3 minutes.Lime is initially added into when tapping molten steel 1/3, amount of lime is 3.5kg/t steel；Ladle is closed after tapping Modification agent 120kg is added in argon bottom-blowing.
(3) RH treatment process: using deep decarburization mode, decarburization time 15min.Minimum vacuum degree control is 0.5mbar； RH blowing oxygen quantity 100Nm3.After decarburization time, molten steel oxygen position is 360ppm, and aluminum shot is added and carries out deoxidation, follows after deoxidation Ring 8 minutes, match titanium, alloy addition sequence manganese metal → ferrotianium, vacuum cycle after alloying with manganese, using ferrotianium using manganese metal Time 8min.The outbound molten steel of RH is shown in Table 3, and out-station temperature is 1615 DEG C, and the furnace time to be poured is 20min.
(4) sheet billet continuous casting process in: heat is even to pour heat, casting blank section 1050mm.Tundish temperature control is shown in Table 4, The Contents of Main Components of ultra-low-carbon steel mold powder is shown in Table 5, and continuous casting billet ingredient is shown in Table 6.Secondary cooling uses and dynamic soft-reduction phase In conjunction with refrigerating mode, 920 DEG C of straightening temperature, casting speed control 1.4m/min；1100 DEG C of baking of tundish temperature, baking time 3h。
(5) reconditioning process: slab upper and lower surface reconditioning 2mm, slab corner carries out cleaning 2mm.
(6) heating process: for heating of plate blank to 1170 ± 20 DEG C, the time in furnace is 180min.
(7) hot-rolled process: the start rolling temperature control of roughing is at 1100 ± 20 DEG C, and roughing reduction ratio is 80%, roughing belt speed For 2.0m/s；1070 ± 20 DEG C of finish rolling start rolling temperature (entry temperature at finishing), finish rolling reduction ratio are 85%, finish rolling entrance de-scaling water Pressure 25Mpa, finishing temperature are 920 ± 10 DEG C；Coiling temperature is 730 ± 10 DEG C, and rolled plate is with a thickness of 2.0mm.
(8) after Plate Production, field trash grade is observed.Individual particle field trash is found at the wide a quarter of plate, it is 5 μm wide, Belong to B type impurity, quantity 4 is shown in Fig. 2.The present embodiment controlling of production process is stablized, the quality of gained filter steel substrate Preferably, the control of molten steel in bakie in continuous casting oxygen mass fraction is 24ppm, nitrogen content control is 24ppm, hot-strip field trash Grade B class is carefully 1.0, through the high-quality cold-rolled products of cold rolling final production.
Embodiment 3: the production technology of this high-quality filter steel substrate is described in detail below.
(1) desulfurizing iron: the molten iron S after desulfurization is 0.005wt%.
(2) converter smelting process: entering 1280 DEG C of furnace molten iron temperature, enters C 4.0% in furnace molten iron, S 0.005%, P 0.126%；Finishing slag basicity R is 4.50, ingredient in molten steel of coming out of the stove: C 0.025%, S 0.010%, P 0.009%, O 900ppm；1710 DEG C of outlet temperature.Bottom blowing is stirred by force 130 seconds after catch carbon, bottom blowing flow 0.15m3/ t*min directly goes out after stirring by force Steel is tapped the time 3.2 minutes.Lime is initially added into when tapping molten steel 1/3, amount of lime is 4.0kg/t steel；It is closed after tapping Modification agent 200kg is added in ladle bottom blowing argon gas.
(3) RH treatment process: using deep decarburization mode, decarburization time 14min.Minimum vacuum degree is 1.2mbar；RH is not Carry out oxygen blast.After decarburization time, molten steel oxygen position is 400ppm, and aluminum shot is added and carries out deoxidation, 7 points are recycled after deoxidation Clock is matched manganese using manganese metal, is matched titanium using ferrotianium, alloy addition sequence manganese metal → ferrotianium, the vacuum cycle time after alloying 9min.The outbound molten steel of RH is shown in Table 3, and out-station temperature is 1624 DEG C, the furnace it is outbound to casting time be 23min.
(4) sheet billet continuous casting process in: heat is to open to pour the first furnace, casting blank section 1051mm.Tundish temperature control is shown in Table 4, the Contents of Main Components of ultra-low-carbon steel mold powder is shown in Table 5, and continuous casting billet ingredient is shown in Table 6；Secondary cooling uses and dynamic soft-reduction The refrigerating mode combined, 905 DEG C of straightening temperature, casting speed control 1.5m/min；1100 DEG C of baking of tundish temperature, when baking Between 3h.
(5) reconditioning process: slab upper and lower surface reconditioning 3mm, slab corner carries out cleaning 3mm.
(6) heating process: for heating of plate blank to 1290 ± 20 DEG C, the time in furnace is 150min.
(7) hot-rolled process: the start rolling temperature control of roughing is at 1100 ± 20 DEG C, and roughing reduction ratio is 80%, roughing belt speed For 2.0m/s；1025 ± 20 DEG C of finish rolling start rolling temperature (entry temperature at finishing), finish rolling reduction ratio are 86%, finish rolling entrance de-scaling water Pressure 26Mpa, finishing temperature are 900 ± 10 DEG C；Coiling temperature is 710 ± 10 DEG C, and rolled plate is with a thickness of 3.0mm.
(8) after Plate Production, field trash grade is observed.Individual particle field trash, wide 2.5 μ are found at the wide a quarter of plate M, belongs to B type impurity, and quantity 4 is shown in Fig. 3.The present embodiment controlling of production process is stablized, the matter of gained filter steel substrate Preferably, the control of molten steel in bakie in continuous casting oxygen mass fraction is 25ppm to amount, nitrogen content control is 33ppm, and hot-strip is mingled with Object grade B class is carefully 1.0, through the high-quality cold-rolled products of cold rolling final production.
Embodiment 4: the production technology of this high-quality filter steel substrate is described in detail below.
(1) desulfurizing iron: the molten iron S after desulfurization is 0.003wt%.
(2) converter smelting process: entering 1290 DEG C of furnace molten iron temperature, enters C 4.1% in furnace molten iron, S 0.003%, P 0.115%；Finishing slag basicity R is 4.0, ingredient in molten steel of coming out of the stove: C 0.040%, S 0.008%, P 0.010%, O 500ppm； 1700 DEG C of outlet temperature.Bottom blowing is stirred by force 130 seconds after catch carbon, bottom blowing flow 0.16m3/ t*min, stirs by force rear direct tapping, when tapping Between 3 minutes.Lime is initially added into when tapping molten steel 1/3, amount of lime is 4.0kg/t steel；Steel ladle bottom argon blowing is closed after tapping Modification agent 100kg is added in gas.
(3) RH treatment process: using deep decarburization mode, decarburization time 14min.Minimum vacuum degree is 0.5mbar；Oxygen blast Amount is 30Nm3.After decarburization time, molten steel oxygen position is 300ppm, and aluminum shot is added and carries out deoxidation, 7 points are recycled after deoxidation Clock is matched manganese using manganese metal, is matched titanium using ferrotianium, alloy addition sequence manganese metal → ferrotianium, the vacuum cycle time after alloying 8min.The outbound molten steel composition of RH is shown in Table 3；Out-station temperature is 1600 DEG C, and the time to be poured is 20min.
(4) sheet billet continuous casting process in: heat is even to pour heat, casting blank section 1050mm.Tundish temperature and degree of superheat control System is shown in Table 4, and the Contents of Main Components of ultra-low-carbon steel mold powder is shown in Table 5, and continuous casting billet ingredient is shown in Table 6；Secondary cooling uses and dynamic The refrigerating mode that slighter compress combines, 925 DEG C of straightening temperature, casting speed control 1.5m/min；1120 DEG C of baking of tundish temperature, Baking time 3.5h.
(5) reconditioning process: slab upper and lower surface reconditioning 2mm, slab corner carries out cleaning 3mm.
(6) heating process: for heating of plate blank to 1200 ± 20 DEG C, the time in furnace is 160min.
(7) hot-rolled process: the start rolling temperature control of roughing is at 1100 ± 20 DEG C, and roughing reduction ratio is 80%, roughing belt speed For 5.0m/s；1025 ± 20 DEG C of finish rolling start rolling temperature (entry temperature at finishing), finish rolling reduction ratio are 85%, finish rolling entrance de-scaling water Pressure 26Mpa, finishing temperature are 900 ± 10 DEG C；Coiling temperature is 710 ± 10 DEG C, and rolled plate is with a thickness of 5.0mm.
(8) after Plate Production, field trash grade is observed.Individual particle field trash is found at the wide a quarter of plate, it is 10 μm wide, Belong to B type impurity, quantity 5 is shown in Fig. 4.The present embodiment controlling of production process is stablized, and filter steel quality is preferable, continuous casting The control of Metal in Tundish oxygen mass fraction is 16ppm, nitrogen content control is 28ppm, and hot-strip field trash grade B class is thin It is 1.5, through the high-quality cold-rolled products of cold rolling final production.
Embodiment 5: the production technology of this high-quality filter steel substrate is described in detail below.
(1) desulfurizing iron: the molten iron S after desulfurization is 0.001wt%.
(2) converter smelting process: entering 1330 DEG C of furnace molten iron temperature, enters C 3.9% in furnace molten iron, S 0.001%, P 0.110%；Finishing slag basicity R is 4.0, ingredient in molten steel of coming out of the stove: C 0.025%, S 0.007%, P 0.009%, O 900ppm； 1690 DEG C of outlet temperature.Bottom blowing, which is stirred by force, after catch carbon blows 120 seconds, bottom blowing flow 0.17m3/ t*min stirs by force rear direct tapping, tapping Time 3.3 minutes.Lime, lime adding amount 3.7kg/t steel are initially added into when tapping molten steel 1/3；Ladle is closed after tapping Modification agent 200kg is added in argon bottom-blowing.
(3) RH treatment process: using deep decarburization mode, decarburization time 14min.Minimum vacuum degree 1mbar；RH blowing oxygen quantity 100Nm3.After decarburization time, molten steel oxygen position is 400ppm, and aluminum shot is added and carries out deoxidation, recycles 6 minutes after deoxidation, Match titanium, alloy addition sequence manganese metal → ferrotianium, vacuum cycle time after alloying with manganese, using ferrotianium using manganese metal 10min.The outbound molten steel of RH is shown in Table 3, and out-station temperature is 1610 DEG C, and the furnace time to be poured is 20min.
(4) sheet billet continuous casting process in: heat is even to pour heat, casting blank section 1051mm.Tundish temperature and degree of superheat control System is shown in Table 4, and the Contents of Main Components of ultra-low-carbon steel mold powder is shown in Table 5, and continuous casting billet ingredient is shown in Table 6；Secondary cooling uses and dynamic The refrigerating mode that slighter compress combines, 925 DEG C of straightening temperature, casting speed control 1.3m/min；1100 DEG C of baking of tundish temperature, Baking time 3.2h.
(5) reconditioning process: slab upper and lower surface reconditioning 3mm, slab corner carries out cleaning 2mm.
(6) heating process: for heating of plate blank to 1290 ± 20 DEG C, the time in furnace is 120min.
(7) hot-rolled process: the start rolling temperature control of roughing is at 1100 ± 20 DEG C, and roughing reduction ratio is 85%, roughing belt speed For 5.0m/s；1070 ± 20 DEG C of finish rolling start rolling temperature (entry temperature at finishing), finish rolling reduction ratio are 85%, finish rolling entrance de-scaling water Pressure 28Mpa, finishing temperature are 920 ± 10 DEG C；Coiling temperature is 730 ± 10 DEG C, and rolled plate is with a thickness of 2.0mm.
(8) after Plate Production, field trash grade is observed.Individual particle field trash is found at the wide a quarter of plate, it is 5 μm wide, Belong to B type impurity, quantity 5 is shown in Fig. 5.The present embodiment controlling of production process is stablized, and filter steel quality is preferable, continuous casting The control of Metal in Tundish oxygen mass fraction is 17ppm, nitrogen content control is 24ppm, and hot-strip field trash grade B class is thin It is 1.5, through the high-quality cold-rolled products of cold rolling final production.
Embodiment 6: the production technology of this high-quality filter steel substrate is described in detail below.
(1) desulfurizing iron: the molten iron S after desulfurization is 0.004wt%.
(2) converter smelting process: entering 1330 DEG C of furnace molten iron temperature, enters C 4.1% in furnace molten iron, S 0.004%, P 0.130%；Finishing slag basicity R is 3.95, ingredient in molten steel of coming out of the stove: C 0.020%, S 0.008%, P 0.009%, O 750ppm；1705 DEG C of outlet temperature.Bottom blowing is stirred by force 140 seconds after catch carbon, bottom blowing flow 0.18m3/ t*min directly goes out after stirring by force Steel is tapped the time 3 minutes.Lime, lime adding amount 4.0kg/t steel are initially added into when tapping molten steel 1/3；It is closed after tapping Modification agent 150kg is added in ladle bottom blowing argon gas.
(3) RH treatment process: using deep decarburization mode, decarburization time 14min.Minimum vacuum degree is 1.5mbar；Oxygen blast Measure 60Nm3.After decarburization time, molten steel oxygen position is 250ppm, and aluminum shot is added and carries out deoxidation, recycles 6 minutes after deoxidation, Match titanium, alloy addition sequence manganese metal → ferrotianium, vacuum cycle time after alloying with manganese, using ferrotianium using manganese metal 8min.The outbound molten steel of RH is shown in Table 3, and out-station temperature is 1616 DEG C, and the furnace time to be poured is 22min.
(4) sheet billet continuous casting process in: heat is to pour time the first furnace, casting blank section 1050mm.Tundish temperature control is shown in Table 4, the Contents of Main Components of ultra-low-carbon steel mold powder is shown in Table 5, and continuous casting billet ingredient is shown in Table 6；Secondary cooling uses and dynamic soft-reduction The refrigerating mode combined, 925 DEG C of straightening temperature, casting speed control 1.5m/min；1150 DEG C of baking of tundish temperature, when baking Between 3h.
(5) reconditioning process: slab upper and lower surface reconditioning 4mm, slab corner carries out cleaning 2mm.
(6) heating process: for heating of plate blank to 1220 ± 20 DEG C, the time in furnace is 160min.
(7) hot-rolled process: the start rolling temperature control of roughing is at 1100 ± 20 DEG C, and roughing reduction ratio is 82%, roughing belt speed For 2.0m/s；1050 ± 20 DEG C of finish rolling start rolling temperature (entry temperature at finishing), finish rolling reduction ratio are 85%, finish rolling entrance de-scaling water Pressure 26Mpa, finishing temperature are 910 ± 10 DEG C；Coiling temperature is 730 ± 10 DEG C, and rolled plate is with a thickness of 4.0mm.
(8) after Plate Production, field trash grade is observed.Individual particle field trash is found at the wide a quarter of plate, it is 50 μm wide, Belong to B type impurity, quantity 2 is shown in Fig. 6.The present embodiment controlling of production process is stablized, and filter steel quality is preferable, continuous casting The control of Metal in Tundish oxygen mass fraction is 20ppm, nitrogen content control is 25ppm, and hot-strip field trash grade B class is thin It is 1.0, through the high-quality cold-rolled products of cold rolling final production.
Embodiment 7: the production technology of this high-quality filter steel substrate is described in detail below.
(1) desulfurizing iron: the molten iron S after desulfurization is 0.004wt%.
(2) converter smelting process: entering 1350 DEG C of furnace molten iron temperature, enters C 4.1% in furnace molten iron, S 0.004%, P 0.110%；Finishing slag basicity R is 3.80, ingredient in molten steel of coming out of the stove: C 0.032%, S 0.008%, P 0.010%, O 800ppm；1690 DEG C of outlet temperature.Bottom blowing is stirred by force 120 seconds after catch carbon, bottom blowing flow 0.16m3/ t*min directly goes out after stirring by force Steel is tapped the time 3.5 minutes.Lime, lime adding amount 3.75kg/t steel are initially added into when tapping molten steel 1/3；After tapping Ladle bottom blowing argon gas is closed, modification agent 150kg is added.
(3) RH treatment process: using deep decarburization mode, decarburization time 16min.Minimum vacuum degree is 1mbar；RH oxygen blast The blowing oxygen quantity 100Nm of heating3.After decarburization time, molten steel oxygen position is 300ppm, and aluminum shot is added and carries out deoxidation, deoxidation terminates Circulation 6 minutes afterwards are matched manganese using manganese metal, are matched titanium using ferrotianium, alloy addition sequence manganese metal → ferrotianium, vacuum after alloying Circulation time 10min.The outbound molten steel composition of RH is shown in Table 3, and out-station temperature is 1595 DEG C, the furnace it is outbound to casting time be 25min.
(4) sheet billet continuous casting process in: heat is even to pour heat, casting blank section 1151mm.Tundish temperature control is shown in Table 4, The Contents of Main Components of ultra-low-carbon steel mold powder is shown in Table 5, and continuous casting billet ingredient is shown in Table 6；Secondary cooling uses and dynamic soft-reduction phase In conjunction with refrigerating mode, 925 DEG C of straightening temperature, casting speed control 1.4m/min；Tundish uses slag blocking wall, slag weir, intermediate 1100 DEG C of packet baking temperature, baking time 3h.
(5) reconditioning process: upper and lower surface reconditioning 3mm, slab corner carry out cleaning 4mm.
(6) heating process: for heating of plate blank to 1240 ± 20 DEG C, the time in furnace is 100min.
(7) hot-rolled process: the start rolling temperature control of roughing is at 1100 ± 20 DEG C, and roughing reduction ratio is 80%, roughing belt speed For 5.0m/s；1040 ± 20 DEG C of finish rolling start rolling temperature (entry temperature at finishing), finish rolling reduction ratio are 88%, finish rolling entrance de-scaling water Pressure 26Mpa, finishing temperature are 900 ± 10 DEG C；Coiling temperature is 720 ± 10 DEG C, and rolled plate is with a thickness of 3.0mm.
(8) after Plate Production, field trash grade is observed.Individual particle field trash is found at the wide a quarter of plate, it is 55 μm wide, Belong to B type impurity, quantity 3 is shown in Fig. 7.The present embodiment controlling of production process is stablized, and filter steel quality is preferable, continuous casting The control of Metal in Tundish oxygen mass fraction is 18ppm, nitrogen content control is 40ppm, and hot-strip field trash grade B class is thin It is 1.0, through the high-quality continuous annealing product of cold rolling final production.
Embodiment 8: the production technology of this high-quality filter steel substrate is described in detail below.
(1) desulfurizing iron: the molten iron S after desulfurization is 0.002wt%.
(2) converter smelting process: entering 1300 DEG C of furnace molten iron temperature, enters C 3.9% in furnace molten iron, S 0.003%, P 0.120%；Finishing slag basicity R is 3.75, ingredient in molten steel of coming out of the stove: C 0.028%, S 0.008%, P 0.008%, O 560ppm；1695 DEG C of outlet temperature.After stirring 135 seconds by force after catch carbon, bottom blowing flow 0.17m3/ t*min stirs by force rear direct tapping, The tapping time 3.0 minutes.Lime is initially added into when tapping molten steel 1/3, amount of lime is 3.6kg/t steel；Steel is closed after tapping Modification agent 170kg is added in packet argon bottom-blowing.
(3) RH treatment process: using deep decarburization mode, decarburization time 15min.Minimum vacuum degree control is 0.8mbar； RH blowing oxygen quantity 85Nm3.After decarburization time, molten steel oxygen position is 280ppm, and aluminum shot is added and carries out deoxidation, recycles after deoxidation 7 minutes, match titanium, alloy addition sequence manganese metal → ferrotianium, after alloying when vacuum cycle with manganese, using ferrotianium using manganese metal Between 8min.The outbound molten steel of RH is shown in Table 3, and out-station temperature is 1616 DEG C, and the furnace time to be poured is 24min.
(4) sheet billet continuous casting process in: heat is to open to pour the first furnace, casting blank section 1051mm.Tundish temperature control is shown in Table 4, the Contents of Main Components of ultra-low-carbon steel mold powder is shown in Table 5, and continuous casting billet ingredient is shown in Table 6.Secondary cooling uses and dynamic soft-reduction The refrigerating mode combined, 910 DEG C of straightening temperature, casting speed control 1.45m/min；1130 DEG C of baking of tundish temperature, baking Time 3.5h.
(5) reconditioning process: slab upper and lower surface reconditioning 3mm, slab corner carries out cleaning 4mm.
(6) heating process: for heating of plate blank to 1270 ± 20 DEG C, the time in furnace is 140min.
(7) hot-rolled process: the start rolling temperature control of roughing is at 1100 ± 20 DEG C, and roughing reduction ratio is 80%, roughing belt speed For 3.0m/s；1035 ± 20 DEG C of finish rolling start rolling temperature (entry temperature at finishing), finish rolling reduction ratio are 87%, finish rolling entrance de-scaling water Pressure 27Mpa, finishing temperature are 915 ± 10 DEG C；Coiling temperature is 715 ± 10 DEG C, and rolled plate is with a thickness of 3.0mm.
(8) after Plate Production, field trash grade is observed.Individual particle field trash is found at the wide a quarter of plate, it is 5 μm wide, Belong to B type impurity, quantity 4.The present embodiment controlling of production process is stablized, and the quality of gained filter steel substrate is preferable, The control of molten steel in bakie in continuous casting oxygen mass fraction is 19ppm, nitrogen content control is 35ppm, hot-strip field trash grade B Class is carefully 1.0, through the high-quality cold-rolled products of cold rolling final production.
Embodiment 9: the production technology of this high-quality filter steel substrate is described in detail below.
(1) desulfurizing iron: the molten iron S after desulfurization is 0.003wt%.
(2) converter smelting process: entering 1280 DEG C of furnace molten iron temperature, enters C 4.1% in furnace molten iron, S 0.005%, P 0.122%；Finishing slag basicity R is 4.20, ingredient in molten steel of coming out of the stove: C 0.041%, S 0.009%, P 0.008%, O 850ppm；1715 DEG C of outlet temperature.Bottom blowing is stirred by force 125 seconds after catch carbon, bottom blowing flow 0.17m3/ t*min directly goes out after stirring by force Steel is tapped the time 3.5 minutes.Lime is initially added into when tapping molten steel 1/3, amount of lime is 3.8kg/t steel；It is closed after tapping Modification agent 160kg is added in ladle bottom blowing argon gas.
(3) RH treatment process: using deep decarburization mode, decarburization time 15min.Minimum vacuum degree is 1.7mbar；RH is blown Oxygen amount 70Nm3.After decarburization time, molten steel oxygen position is 350ppm, and aluminum shot is added and carries out deoxidation, 7 points are recycled after deoxidation Clock is matched manganese using manganese metal, is matched titanium using ferrotianium, alloy addition sequence manganese metal → ferrotianium, the vacuum cycle time after alloying 10min.The outbound molten steel of RH is shown in Table 3, and out-station temperature is 1631 DEG C, the furnace it is outbound to casting time be 21min.
(4) sheet billet continuous casting process in: heat is to open to pour the first furnace, casting blank section 1051mm.Tundish temperature control is shown in Table 4, the Contents of Main Components of ultra-low-carbon steel mold powder is shown in Table 5, and continuous casting billet ingredient is shown in Table 6；Secondary cooling uses and dynamic soft-reduction The refrigerating mode combined, 915 DEG C of straightening temperature, casting speed control 1.35m/min；1110 DEG C of baking of tundish temperature, baking Time 3.3h.
(5) reconditioning process: slab upper and lower surface reconditioning 4mm, slab corner carries out cleaning 3mm.
(6) heating process: for heating of plate blank to 1230 ± 20 DEG C, the time in furnace is 130min.
(7) hot-rolled process: the start rolling temperature control of roughing is at 1100 ± 20 DEG C, and roughing reduction ratio is 81%, roughing belt speed For 4.0m/s；1060 ± 20 DEG C of finish rolling start rolling temperature (entry temperature at finishing), finish rolling reduction ratio are 87%, finish rolling entrance de-scaling water Pressure 30Mpa, finishing temperature are 905 ± 10 DEG C；Coiling temperature is 725 ± 10 DEG C, and rolled plate is with a thickness of 4.0mm.
(8) after Plate Production, field trash grade is observed.Individual particle field trash, wide 2.5 μ are found at the wide a quarter of plate M belongs to B type impurity, quantity 4.The present embodiment controlling of production process is stablized, the quality of gained filter steel substrate compared with Good, the control of molten steel in bakie in continuous casting oxygen mass fraction is 22ppm, nitrogen content control is 26ppm, hot-strip field trash etc. Grade B class is carefully 1.0, through the high-quality cold-rolled products of cold rolling final production.
Table 3: the outbound chemical component composition of RH and content (wt%) in each embodiment
In table 3, surplus is Fe and inevitable impurity.
Table 4: the tundish temperature (DEG C) in each embodiment
Table 5: the Contents of Main Components (wt) of ultra-low-carbon steel mold powder in each embodiment
Table 6: the chemical component composition and content (wt%) of slab in each embodiment

Claims (5)

1. a kind of production technology of high-quality filter steel substrate, it is characterised in that: it include desulfurizing iron, converter smelting, RH processing, middle sheet billet continuous casting, heating of plate blank and hot-rolled process；The desulfurizing iron process: desulfurizing iron to S≤0.005%；Institute State converter smelting process, finishing slag basicity is 3.5~4.5, C 0.020%~0.045%, S≤0.010%, P in molten steel of tapping≤ 0.010%, outlet temperature >=1690 DEG C, terminal oxygen position control does not take molten steel sample after 500~900ppm, converter catch carbon, and bottom blowing is strong Rear direct tapping is stirred, time >=3 minute of tapping；The RH treatment process, using deep decarburization mode, decarburization time >=14min, RH Blowing oxygen quantity control≤100m3, vacuum cycle time >=8min after alloy is added, C≤0.0030%, Mn in the outbound molten steel of RH 0.10%~0.20%, Si≤0.010%, S≤0.012%, P≤0.012%, Als 0.030%~0.050%, Ti 0.050%~ 0.070%,N≤0.0035%,O≤0.0020%；The middle sheet billet continuous casting process, molten steel in bakie in continuous casting temperature 1559~1579 DEG C, baking of tundish temperature >=1100 DEG C, baking time >=3 hour, secondary cooling using combined with dynamic soft-reduction it is cold But mode, straightening temperature >=900 DEG C；The heating of plate blank process, heating temperature are 1150~1310 DEG C, and the control of time in furnace exists 100~180min；The hot-rolled process, roughing mill speed >=1.0m/s, the finishing temperature of finish rolling are 890~930 DEG C.
2. the production technology of high-quality filter steel substrate according to claim 1, it is characterised in that: the middle slab Crystallizer uses ultra-low-carbon steel mold powder in continuous casting working procedure, wherein C 3~8%, SiO224~35%, CaO 25~40%, Al2O3 2~6%, fusing point is 1100 ± 50 DEG C, and viscosity is 0.5~2.5 pool.
3. the production technology of high-quality filter steel substrate according to claim 1, it is characterised in that: the middle slab Continuous casting working procedure, O≤25ppm, N≤40ppm in slab.
4. the production technology of high-quality filter steel substrate according to claim 1, it is characterised in that: the roughing work Sequence, using reciprocal 5 passes of reversible mill.
5. the production technology of high-quality filter steel substrate according to any one of claims 1-4, feature exist In: its middle slab caster and hot rolling producing line for using 100t converter and matching.
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