CN105886701A - Production process of high-quality ultra-low-carbon IF steel - Google Patents

Production process of high-quality ultra-low-carbon IF steel Download PDF

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CN105886701A
CN105886701A CN201610347654.0A CN201610347654A CN105886701A CN 105886701 A CN105886701 A CN 105886701A CN 201610347654 A CN201610347654 A CN 201610347654A CN 105886701 A CN105886701 A CN 105886701A
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steel
mass percent
temperature
vacuum
carbon
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CN105886701B (en
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李波
李梦英
马德刚
张洪波
王兰玉
高永春
刘海春
李建设
李经哲
冯慧霄
刘丽萍
李梦龙
周泉林
段云祥
吴艳青
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Tangshan Iron and Steel Group Co Ltd
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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
    • 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
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses a production process of high-quality ultra-low-carbon IF steel. The production process includes the procedures of blast furnace molten iron, DeS pretreatment desulfurization, DeP dephosphorization, DeC decarbonization, RH vacuum treatment and CC conventional slab continuous casting. In the DeP dephosphorization procedure, the final temperature is not lower than 1330 DEG C, and the mass percent of final semi-steel components are controlled so that the mass percent of C can range from 3.40% to 3.60%, the mass percent of S cannot be higher than 0.010% and the mass percent of P cannot be higher than 0.040%. In the DeC decarbonization procedure, non-turning-down direct discharge is adopted, and the mass percent of final molten steel components are controlled so that the mass percent of C can range from 0.025% to 0.040%, the mass percent of S cannot be larger than 0.011% and the mass percent of P cannot be larger than 0.010%, and the final temperature ranges from 1680 DEG C to 1700 DEG C. In the RH vacuum treatment procedure, a vacuum mechanical pump is used for adjusting the vacuum degree. In the CC conventional slab continuous casting procedure, a tundish is made of non-carbon and non-magnesium refractory, and the draw speed is controlled to range from 1.1 m/min to 1.4 m/min. By means of the method, a continuous casting billet without any defect is produced, high-quality hot-rolled coiled plates are produced through hot rolling, and high-quality continuously-annealed and zinc-plated products are finally produced through cold rolling.

Description

The production technology of high-quality ultra low carbon IF steel
Technical field
The invention belongs to field of iron and steel smelting, the production technology of a kind of high-quality ultra low carbon IF steel.
Background technology
IF steel (Interstitial Free Steel), it is again gapless atomic steel, because it has the deep drawability of excellence, has Ultra-low carbon, microalloying, feature that steel is pure, there is high-ductility strain ratio, high elongation rate, high hardening index, relatively low yield tensile ratio simultaneously, and excellence is non-ageing, therefore it is described as the 3rd generation ultra-deep punching steel, is used widely in auto industry and household electric appliances.Its essence is to add Ti and Nb. in steel to form the nitrogen-containing compound of Ti and Nb, thus obtains the clean ferritic steel of gap-free atom, is Ultra-low carbon gapless atomic steel.
In recent years, along with the fast development of auto industry, the demand of IF steel sharply increased.Domestic each big steel enterprise strengthens the R&D intensity of IF steel one after another, and the composition of current IF steel can control in [C] 0.002%, [N] 0.002%, the level of [S] 0.001%, T [O] 0.002%.Common IF steel production technology has two kinds: A: desulfurizing iron → top and bottom combined blown converter → RH application of vacuum → continuous casting；B: desulfurizing iron → top and bottom combined blown converter → LF refine → RH application of vacuum → continuous casting.Use above-mentioned production technology, following problem can be brought: one is the 100t converter using capacity less so that the temperature drop rate in production process is big, causes RH refine oxygenating to heat up, and increases the probability that foreign substance in molten steel generates；Two is that converter takes off P difficulty, and the production cycle is long, asymmetric with conventional plate blank conticaster rhythm, causes pulling rate to fluctuate, and mould liquid level fluctuation is big, is susceptible to slag entrapment in mold, coiled sheet surface quality is brought adverse influence.
Summary of the invention
The technical problem to be solved in the present invention is to provide the production technology of the high-quality ultra low carbon IF steel of a kind of good product quality.
For solving above-mentioned technical problem, the technical solution used in the present invention is: it includes blast-melted, DeS pretreatment desulfurizing, DeP dephosphorization, DeC decarburization, RH application of vacuum and CC conventional plate blank continuous casting working procedure；Described DeP dephosphorization operation: outlet temperature >=1330 DEG C, the mass percent controlling terminal half composition of steel is: C 3.40～3.60%, S≤0.010%, P≤0.040%；Described DeC decarbonization process, uses and does not falls stove and directly go out, control the mass percent of endpoint molten steel composition: C 0.025～0.040%, S≤0.011%, P≤0.010%, outlet temperature 1680～1700 DEG C；Described RH application of vacuum operation, uses vacuum mechanical pump to adjust vacuum；Described CC conventional plate blank continuous casting working procedure, tundish uses carbon-free magnesium refractory, and casting speed control is 1.1～1.4m/min.
DeP dephosphorization operation of the present invention: finishing slag basicity is 1.8～2.0, time≤7 minute of tapping.
DeC decarbonization process of the present invention: finishing slag basicity is 3.2～3.6, big bag temperature 1660～1680 DEG C, hit at first time terminal P；Outlet temperature 1680～1700 DEG C, terminal oxygen position 550～800ppm, finishing slag FeO mass percent≤20%, time >=3 minute of tapping.
RH application of vacuum operation of the present invention: inlet temperature 1635～1650 DEG C, oxygen position 550～700ppm of entering the station；Departures chemical composition mass percent: C≤0.0030%, Mn 0.10～0.20%, S≤0.012%, P≤0.013%, Si≤0.03%, Als 0.020～0.050%, Ti 0.055～0.070%；Out-station temperature 1600～1620 DEG C.
CC conventional plate blank continuous casting working procedure of the present invention: molten steel temperature in tundish 1555～1575 DEG C；Tundish uses slag blocking wall or slag weir, baking of tundish temperature >=1100 DEG C, baking time >=4h；Using carbon-free double-deck coverture, cooling twice uses the strong type of cooling, ensures straightening temperature >=800 DEG C simultaneously.
Use and have the beneficial effects that produced by technique scheme: the present invention uses DeS-DeP-DeC-RH-CC technique to produce ultra low carbon IF steel, by controlling the carbon content of dephosphorization stove terminal, phosphorus content and half steel temperature, the stove that do not falls controlling decarbonizing furnace directly goes out, reduce temperature losses of the process, use vacuum mechanical pump fast, accurate and stable control carbon content, steady production rhythm, the technological measures such as permanent pulling rate produce and meet requirement, produce the continuous casting billet without any defect, hot rolling produces high-quality hot-rolled coil, even moves back and galvanizing production through cold rolling final production high-quality.
Detailed description of the invention
The technological process of the production technology of this high-quality ultra low carbon IF steel is: blast-melted → DeS pretreatment desulfurizing → DeP dephosphorization → DeC decarburization → RH application of vacuum → CC conventional plate blank continuous casting；Using 100t converter producing, the process conditions of each operation are as described below:
(1) DeS pretreatment desulfurizing operation: the molten iron in ladle is jetted after Calx and magnesium powder in proportion, is scratched clean by bits, enters converter molten iron (departures molten iron) S≤0.003%.
(2) DeP dephosphorization operation: finishing slag basicity is 1.8～2.0；Half steel control composition mass percent C3.40～3.60%, S≤0.010%, P≤0.040%；Outlet temperature >=1330 DEG C, time≤7 minute of tapping；Use pushing off the slag mark pushing off the slag, slag thickness≤80mm.
(3) DeC decarbonization process: finishing slag basicity is 3.2～3.6；Fall stove directly go out, big bag temperature 1660～1680 DEG C, more conventional tapping temperature is low 20 DEG C, hit at first time terminal P, molten steel control composition mass percent C0.025～0.040%, S≤0.011%, P≤0.010%；Outlet temperature 1680～1700 DEG C, terminal oxygen position 550～800ppm, finishing slag FeO mass percent≤20%, time >=3 minute of tapping.
Use the double pushing off the slag of slide plate+pushing off the slag mark, slag thickness≤50mm；Lime adding amount 2.2～3.0kg/t steel, modification agent addition 1.2～1.5kg/t steel, fluorite 0.3～0.8kg/t steel；Charging, charging sequence Calx successively, fluorite, modification agent is started during tapping molten steel 1/5；Alloy and slag making materials is added before tapping 3/4.
(4) RH application of vacuum operation: inlet temperature 1635～1650 DEG C, oxygen position 550～700ppm of entering the station, decarburization, deoxidation and microalloying；Departures chemical composition mass percent: C≤0.0030%, Mn 0.10～0.20%, S≤0.012%, P≤0.013%, Si≤0.03%, Als 0.020～0.050%, Ti 0.055～0.070%, out-station temperature 1600～1620 DEG C.
Using vacuum mechanical pump to adjust vacuum, change in process amplitude is mild, the beneficially stable reaction of carbon oxygen in molten steel.Carbon period vacuum≤1.2mbar, argon circulation 60Nm3/ h, time 12～15min；Alloying vacuum 1.5mbar, argon circulation 50Nm3/h；Quiet circulation time >=8min；Oxygen blast phase vacuum 40～80mbar, argon circulation 50Nm3/h。
(5) CC conventional plate blank continuous casting working procedure: molten steel temperature in tundish 1555～1575 DEG C；Tundish uses slag blocking wall, slag weir, baking of tundish temperature >=1100 DEG C, baking time >=4 hour, and tundish uses carbon-free magnesium refractory, carbon-free aluminum matter Argon filling pipe end, Argon stopper and submersed nozzle；Using carbon-free double-deck coverture, crystallizer uses carbon-free, low alkalinity, high-viscosity covering slag, and cooling twice uses the strong type of cooling, ensures straightening temperature >=800 DEG C simultaneously；Casting speed control is 1.1～1.4m/min.
(6), in above-mentioned DeC decarburization, RH application of vacuum and CC conventional plate blank continuous casting working procedure, middle Baogang water oxygen, nitrogen content mass number all control as T [O]≤20ppm, [N]≤35ppm.
(7) continuous casting billet hot rolled one-tenth hot-rolled coil, hot-rolled coil, again through cold rolling, obtains ultra low carbon IF steel steel plate.
Below in conjunction with detailed description of the invention, the present invention is further detailed explanation.
Embodiment 1-10: the production technology of this high-quality ultra low carbon IF steel uses following concrete technology.
1, the equipment used in embodiment is: DeP dephosphorization stove 100t, DeC decarbonizing furnace 100t, RH refine 100t；CC conventional plate blank continuous casting: continuous casting billet width 1280mm, thick 200mm.
2, concrete operation step and each procedure technology state modulator are as follows:
(1) DeS pretreatment desulfurizing operation: a. molten iron temperature 1315～1362 DEG C, S 0.016～0.035%, P 0.113～0.124%；
B. converting process is with desulfurization as main target, and Calx is 5.5:1 with the quality proportioning of magnesium powder；
C. using dragveyer to drag for slag, molten iron top layer is without slag, molten iron exposed surface >=90%；
D. set off S≤0.003wt%, temperature 1295～1348 DEG C.
(2) DeP dephosphorization operation: a. molten iron temperature 1295～1322 DEG C, S 0.001～0.002%, P 0.113～0.124%；
B. charge weight: molten iron 108～115t, steel scrap 5～15t；
C. converting process is with dephosphorization as main target, it is desirable to full range slag, and process addition presses down slag agent and prevents splash；
D. pushing off the slag mark pushing off the slag, steel stream rounding are used；Tapping (half steel) main component and concrete technology are shown in Table 1.
Table 1: half composition of steel (wt%) and technological parameter
(3) DeC decarbonization process: a. half steel temperature 1325～1366 DEG C, S 0.004～0.007%, P 0.034～0.039%；
B. charge weight: half steel 110～115t, steel scrap 0～5t；
C. converting process is with decarburization, dephosphorization as main target, it is desirable to full range slag, and furnace temperature steadily rises；
The stove that the most do not falls directly goes out, hit at first time terminal P；Endpoint molten steel component content and temperature, oxygen position are shown in Table 2；
F. the double pushing off the slag of pushing off the slag mark+slide plate is used；During tapping, steel stream rounding, tapping uses turnover, clean carbon-free ladle；Start charging, charging sequence: Calx → fluorite → modification agent during tapping molten steel 1/5, before tapping 3/4, add alloy and slag making materials；The technological parameter that this operation is concrete is shown in Table 3.
Table 2:DeC decarbonization process terminal composition (wt%) and temperature, oxygen position
The technological parameter of table 3:DeC decarbonization process
(4) RH application of vacuum operation: a. opens oil-sealed rotary pump (screw pump, lobe pump), forvacuum；
B. ladle enters the station, thermometric；
C. vacuum main valve, carbon period vacuum≤1.2mbar, argon circulation 60Nm are opened3/ h, time 12～15min；Alloying vacuum 1.5mbar, argon circulation 50Nm3/h；Quiet circulation time >=8min；Oxygen blast phase vacuum 40～80mbar, argon circulation 50Nm3/h；
D. thermometric determines oxygen, adds the ferrotianium 1.0kg/t steel of Ti content 70%, thermometric sampling departures；
E. out-station temperature: open and water 1618～1620 DEG C, connect casting ladle time 1600～1610 DEG C；RH departures chemical composition is shown in Table 4.
Table 4:RH departures chemical composition (wt%)
(5) CC conventional plate blank continuous casting working procedure: a. ladle to tundish uses long nozzle to add argon gas-sealed protection molten steel, and at long nozzle, molten steel can not be exposed；Ladle, when basket pouring molten steel, forbids slag；
B. in, bag uses carbon-free magnesium refractory, carbon-free aluminum matter Argon filling pipe end and Argon stopper, uses carbon-free double-deck coverture；
C. crystallizer uses the submersed nozzle that carbon-free, low alkalinity, high-viscosity covering slag, structure and material optimize；
D. the two cold employing strong type of cooling of C1.
The technological parameter of this operation is shown in Table 5；The chemical composition of gained IF product made from steel is shown in Table 6.
The technological parameter of table 5:CC conventional plate blank continuous casting working procedure
Table 6:IF product made from steel chemical analysis (wt%)
Embodiment C Mn S P Si Als Ti
1 0.0021 0.15 0.008 0.010 0.01 0.027 0.059
2 0.0018 0.14 0.007 0.008 0.01 0.031 0.050
3 0.0030 0.15 0.007 0.010 0.01 0.050 0.069
4 0.0016 0.14 0.006 0.006 0.02 0.035 0.064
5 0.0028 0.20 0.006 0.008 0.01 0.042 0.070
6 0.0019 0.15 0.006 0.008 0.03 0.031 0.060
7 0.0022 0.14 0.012 0.006 0.01 0.034 0.062
8 0.0021 0.13 0.008 0.013 0.018 0.020 0.060
9 0.0019 0.10 0.006 0.009 0.01 0.029 0.062
10 0.0022 0.14 0.007 0.009 0.01 0.036 0.062
3, various embodiments of the present invention produce continuous casting billet macroscopic examination and the defects such as centre burst, center porosity and center segregation do not occur, casting billet surface and subcutaneous do not have dreg defect；Hot-rolled sheet coil excellent surface quality；The performance of gained IF product made from steel is shown in Table 7.
Table 7:IF product made from steel performance profile
Embodiment Tension Rm, Mpa Surrender Rp0.2, Mpa Elongation percentage (A50)
1 303 244 45.2
2 305 246 45.5
3 299 236 47.0
4 307 249 44.1
5 300 240 44.8
6 310 251 44.5
7 306 244 44.9
8 295 240 48.0
9 296 246 49.0
10 315 255 43.9

Claims (5)

1. the production technology of a high-quality ultra low carbon IF steel, it is characterised in that: it includes blast-melted, DeS pretreatment desulfurizing, DeP dephosphorization, DeC decarburization, RH application of vacuum and CC conventional plate blank continuous casting working procedure；Described DeP dephosphorization operation: outlet temperature >=1330 DEG C, the mass percent controlling terminal half composition of steel is: C 3.40～3.60%, S≤0.010%, P≤0.040%；Described DeC decarbonization process, uses and does not falls stove and directly go out, control the mass percent of endpoint molten steel composition: C 0.025～0.040%, S≤0.011%, P≤0.010%, outlet temperature 1680～1700 DEG C；Described RH application of vacuum operation, uses vacuum mechanical pump to adjust vacuum；Described CC conventional plate blank continuous casting working procedure, tundish uses carbon-free magnesium refractory, and casting speed control is 1.1～1.4m/min.
The production technology of high-quality ultra low carbon IF steel the most according to claim 1, it is characterised in that described DeP dephosphorization operation: finishing slag basicity is 1.8～2.0, time≤7 minute of tapping.
The production technology of high-quality ultra low carbon IF steel the most according to claim 1, it is characterised in that described DeC decarbonization process: finishing slag basicity is 3.2～3.6, big bag temperature 1660～1680 DEG C, hit at first time terminal P；Outlet temperature 1680～1700 DEG C, terminal oxygen position 550～800ppm, finishing slag FeO mass percent≤20%, time >=3 minute of tapping.
The production technology of high-quality ultra low carbon IF steel the most according to claim 1, it is characterised in that described RH application of vacuum operation: inlet temperature 1635～1650 DEG C, oxygen position 550～700ppm of entering the station；Departures chemical composition mass percent: C≤0.0030%, Mn 0.10～0.20%, S≤0.012%, P≤0.013%, Si≤0.03%, Als 0.020～0.050%, Ti 0.055～0.070%；Out-station temperature 1600～1620 DEG C.
5. according to the production technology of the high-quality ultra low carbon IF steel described in claim 1-4 any one, it is characterised in that described CC conventional plate blank continuous casting working procedure: molten steel temperature in tundish 1555～1575 DEG C；Tundish uses slag blocking wall or slag weir, baking of tundish temperature >=1100 DEG C, baking time >=4h；Using carbon-free double-deck coverture, cooling twice uses the strong type of cooling, ensures straightening temperature >=800 DEG C simultaneously.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110699594A (en) * 2019-10-30 2020-01-17 攀钢集团攀枝花钢铁研究院有限公司 Method for smelting IF steel from semisteel at low cost
CN112048671A (en) * 2020-09-07 2020-12-08 北京首钢股份有限公司 Continuous annealing cold-rolled carbon steel for stamping and preparation method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101760583A (en) * 2009-12-22 2010-06-30 马鞍山钢铁股份有限公司 Method for controlling impurity in ultra low carbon IF steel
CN104178682A (en) * 2014-08-12 2014-12-03 首钢京唐钢铁联合有限责任公司 Preparation method of IF (Interstitial Free) steel containing phosphorus, silicon and manganese

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101760583A (en) * 2009-12-22 2010-06-30 马鞍山钢铁股份有限公司 Method for controlling impurity in ultra low carbon IF steel
CN104178682A (en) * 2014-08-12 2014-12-03 首钢京唐钢铁联合有限责任公司 Preparation method of IF (Interstitial Free) steel containing phosphorus, silicon and manganese

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110699594A (en) * 2019-10-30 2020-01-17 攀钢集团攀枝花钢铁研究院有限公司 Method for smelting IF steel from semisteel at low cost
CN110699594B (en) * 2019-10-30 2021-06-04 攀钢集团攀枝花钢铁研究院有限公司 Method for smelting IF steel from semisteel at low cost
CN112048671A (en) * 2020-09-07 2020-12-08 北京首钢股份有限公司 Continuous annealing cold-rolled carbon steel for stamping and preparation method thereof
CN112048671B (en) * 2020-09-07 2021-10-01 北京首钢股份有限公司 Continuous annealing cold-rolled carbon steel for stamping and preparation method thereof

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