CN105886701B - The production technology of high-quality ultra low carbon IF steel - Google Patents

The production technology of high-quality ultra low carbon IF steel Download PDF

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CN105886701B
CN105886701B CN201610347654.0A CN201610347654A CN105886701B CN 105886701 B CN105886701 B CN 105886701B CN 201610347654 A CN201610347654 A CN 201610347654A CN 105886701 B CN105886701 B CN 105886701B
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steel
temperature
vacuum
continuous casting
mass percent
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CN105886701A (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 kind of production technology of high-quality ultra low carbon IF steel, including blast-melted, DeS pretreatment desulfurizings, DeP dephosphorizations, DeC decarburizations, RH application of vacuum and CC conventional plate blank continuous casting working procedures；The DeP dephosphorizations process：Outlet temperature >=1330 DEG C, the mass percent of control half composition of steel of terminal are：C 3.40~3.60%, S≤0.010%, P≤0.040%；The DeC decarbonization process using stove does not go out directly, controls the mass percent of endpoint molten steel ingredient：C 0.025~0.040%, S≤0.011%, P≤0.010%, 1680~1700 DEG C of outlet temperature；The RH application of vacuum process adjusts vacuum degree using vacuum mechanical pump；The CC conventional plate blanks continuous casting working procedure, tundish use carbon-free magnesium refractory, and casting speed control is 1.1~1.4m/min.This method produces the continuous casting billet without any defect, and hot rolling produces high-quality hot-rolled coil, through the high-quality continuous annealing of cold rolling final production and galvanizing production.

Description

The production technology of high-quality ultra low carbon IF steel
Technical field
The invention belongs to field of iron and steel smelting, especially a kind of production technology of high-quality ultra low carbon IF steel.
Background technology
IF steel (Interstitial Free Steel), is called gapless atomic steel, because it is with excellent deep drawing quality Can, have the characteristics that Ultra-low carbon, microalloying, steel are pure, while there is high-ductility strain to refer to than, high elongation rate, high harden Mark, relatively low yield tensile ratio and excellent Non-ageing, therefore the 3rd generation ultra-deep punching steel is known as, in auto industry and household electrical appliances Industry is used widely.Its essence is that the nitrogenous compound that Ti and Nb. forms Ti and Nb is added in steel, so as to obtain continuously The clean ferritic steel of gap atom, as Ultra-low carbon gapless atomic steel.
In recent years, with the fast development of auto industry, the demand of IF steel sharply increases.Domestic major iron and steel enterprise is confused The R＆D intensity of IF steel is confusingly increased, the ingredient of IF steel can have been controlled in [C] 0.002%, [N] 0.002%, [S] at present 0.001%th, the level of T [O] 0.002%.There are two types of common IF steel production technologies：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 refining → RH application of vacuum → continuous casting.Using above-mentioned Production technology can bring following problem：First, using the smaller 100t converters of capacity so that the temperature drop rate in production process Greatly, RH refining oxygenating heatings are caused, increase the probability of foreign substance in molten steel generation；Second is that converter takes off P difficulties, the production cycle is long, with Conventional plate blank conticaster rhythm is asymmetric, and pulling rate is caused to fluctuate, and mould liquid level fluctuation is big, and slag entrapment in mold easily occurs, right Coiled sheet surface quality brings detrimental effect.
Invention content
The technical problem to be solved in the present invention is to provide a kind of production works of the high-quality ultra low carbon IF steel of good product quality Skill.
In order to solve the above technical problems, the technical solution used in the present invention is：It includes blast-melted, DeS pretreatments Desulfurization, DeP dephosphorizations, DeC decarburizations, RH application of vacuum and CC conventional plate blank continuous casting working procedures；The DeP dephosphorizations process：Outlet temperature >=1330 DEG C, control half composition of steel of terminal mass percent be：C 3.40~3.60%, S≤0.010%, P≤0.040%； The DeC decarbonization process using stove does not go out directly, controls the mass percent of endpoint molten steel ingredient：C 0.025~0.040%, S≤0.011%, P≤0.010%, 1680~1700 DEG C of outlet temperature；The RH application of vacuum process, using vacuum mechanical pump Adjust vacuum degree；The CC conventional plate blanks continuous casting working procedure, tundish use carbon-free magnesium refractory, and casting speed control is 1.1~1.4m/ min。
DeP dephosphorizations process 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, and big 1660~1680 DEG C of packet temperature is primary to order Middle terminal P；1680~1700 DEG C of outlet temperature, terminal oxygen 550~800ppm of position, finishing slag FeO mass percent≤20%, tapping Time >=3 minute.
RH application of vacuum process of the present invention：1635~1650 DEG C of inlet temperature, enter the station 550~700ppm of oxygen position；Go out Chemical composition of standing mass percent：C≤0.0030%, Mn 0.10~0.20%, S≤0.012%, P≤0.013%, Si≤ 0.03%th, Als 0.020~0.050%, Ti 0.055~0.070%；1600~1620 DEG C of out-station temperature.
CC conventional plate blanks continuous casting working procedure of the present invention：1555~1575 DEG C of molten steel temperature in tundish；Tundish is using gear Slag wall or slag weir, baking of tundish temperature >=1100 DEG C, baking time >=4h；Use carbon-free double-deck coverture, secondary cooling Using the strong type of cooling, while ensure straightening temperature >=800 DEG C.
It is using advantageous effect caused by above-mentioned technical proposal：The present invention uses DeS-DeP-DeC-RH-CC techniques Ultra low carbon IF steel is produced, by controlling carbon content, phosphorus content and the half steel temperature of dephosphorization stove terminal, controls decarbonizing furnace not Stove directly goes out, and temperature losses of the process is reduced, using the fast, accurate and stable control carbon content of vacuum mechanical pump, steady production rhythm, permanent pulling rate etc. Technological measure meets the requirements to produce, and produces the continuous casting billet without any defect, hot rolling produces high-quality hot-rolled coil, final through cold rolling Produce high-quality continuous annealing and galvanizing production.
Specific embodiment
The technological process of the production technology of this high-quality ultra low carbon IF steel is：Blast-melted → DeS pretreatment desulfurizings → DeP Dephosphorization → DeC decarburizations → RH application of vacuum → CC conventional plate blank continuous castings；Using 100t converter producings, the process conditions of each process are such as It is lower described：
(1) DeS pretreatment desulfurizings process：After molten iron in ladle is blown lime and magnesium powder in proportion, bits are scratched clean, Enter converter molten iron (outbound molten iron) S≤0.003%.
(2) DeP dephosphorizations process：Finishing slag basicity is 1.8~2.0；Half steel control composition mass percent C3.40~ 3.60%th, S≤0.010%, P≤0.040%；Outlet temperature >=1330 DEG C, time≤7 minute of tapping；Using pushing off the slag mark pushing off the slag, Slag thickness≤80mm.
(3) DeC decarbonization process：Finishing slag basicity is 3.2~3.6；The stove that do not fall directly goes out, big 1660~1680 DEG C of packet temperature, compared with Conventional tapping temperature is 20 DEG C low, hit at first time terminal P, and molten steel control composition mass percent C0.025~0.040%, S≤ 0.011%th, P≤0.010%；1680~1700 DEG C of outlet temperature, terminal oxygen 550~800ppm of position, finishing slag FeO mass percents ≤ 20%, time >=3 minute of tapping.
Using 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；Tap molten steel 1/5 when start to feed, charging sequence stone successively Ash, fluorite, modification agent；Alloy and slag making materials are added before tapping 3/4.
(4) RH application of vacuum process：1635~1650 DEG C of inlet temperature, enter the station 550~700ppm of oxygen position, decarburization, deoxidation And microalloying；Outbound chemical composition mass percent：C≤0.0030%, Mn 0.10~0.20%, S≤0.012%, P≤ 0.013%th, Si≤0.03%, Als 0.020~0.050%, Ti 0.055~0.070%, out-station temperature 1600~1620 ℃。
Vacuum degree is adjusted using vacuum mechanical pump, change in process amplitude is gentle, is reacted conducive to stablizing for carbon oxygen in molten steel.It is de- Carbon phase vacuum degree≤1.2mbar, argon gas circulation 60Nm3/ h, 12~15min of time；Alloying vacuum degree 1.5mbar, argon gas ring Flow 50Nm3/h；Quiet circulation time >=8min；Oxygen blast phase 40~80mbar of vacuum degree, argon gas circulation 50Nm3/h。
(5) CC conventional plate blanks continuous casting working procedure：1555~1575 DEG C of molten steel temperature in tundish；Tundish is using slag blocking wall, gear Slag weir, baking of tundish temperature >=1100 DEG C, baking time >=4 hour, tundish use carbon-free magnesium refractory, and carbon-free aluminum is blown 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, secondary cooling uses the strong type of cooling, while ensures straightening temperature >=800 DEG C；Casting speed control is 1.1~1.4m/ min。
(6) in above-mentioned DeC decarburizations, RH application of vacuum and CC conventional plate blank continuous casting working procedures, middle Baogang's water oxygen, nitrogen content quality Number control is T [O]≤20ppm, [N]≤35ppm.
(7) continuous casting billet is hot rolled into hot-rolled coil, and hot-rolled coil through cold rolling, obtains ultra low carbon IF steel steel plate again.
The present invention will be further described in detail with reference to the specific embodiments.
Embodiment 1-10：The production technology of this high-quality ultra low carbon IF steel uses following concrete technologies.
1st, the equipment used in embodiment for：DeP dephosphorization stove 100t, DeC decarbonizing furnaces 100t, RH refining 100t；CC is conventional Sheet billet continuous casting：Continuous casting billet wide 1280mm, thick 200mm.
2nd, concrete operation step and each process process parameter control are as follows：
(1) DeS pretreatment desulfurizings process：A. 1315~1362 DEG C of molten iron temperature, S 0.016~0.035%, P 0.113 ~0.124%；
B. for converting process using desulfurization as main target, the quality proportioning of lime and magnesium powder is 5.5:1；
C. slag is dragged for using dragveyer, molten iron surface layer is without slag, molten iron exposed surface >=90%；
D. outbound S≤0.003wt%, 1295~1348 DEG C of temperature.
(2) DeP dephosphorizations process：A. 1295~1322 DEG C of molten iron temperature, S 0.001~0.002%, P 0.113~ 0.124%；
B. charge weight：108~115t of molten iron, 5~15t of steel scrap；
C. converting process is using dephosphorization as main target, it is desirable that whole slugging, process, which adds in suppression slag agent, prevents splash；
D. using pushing off the slag mark pushing off the slag, steel stream rounding；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. 1325~1366 DEG C of half steel temperature, S 0.004~0.007%, P 0.034~ 0.039%；
B. charge weight：110~115t of half steel, 0~5t of steel scrap；
C. converting process is using decarburization, dephosphorization as main target, it is desirable that whole slugging, furnace temperature steadily rise；
D. the stove that do not fall directly goes out, hit at first time terminal P；Endpoint molten steel component content and temperature, oxygen position are shown in Table 2；
F. using the double pushing off the slag of pushing off the slag mark+slide plate；During tapping, steel stream rounding, tapping uses turnover, clean carbon-free ladle； Start to feed during tapping molten steel 1/5, charging sequence：Lime → fluorite → modification agent adds alloy and slag making material before tapping 3/4 Material；The specific technological parameter of this process is shown in Table 3.
Table 2：DeC decarbonization process terminal ingredients (wt%) and temperature, oxygen position
Table 3：The technological parameter of DeC decarbonization process
(4) RH application of vacuum process：A. oil-sealed rotary pump (screw pump, lobe pump), forvacuum are opened；
B. ladle enters the station, thermometric；
C. vacuum main valve, carbon period vacuum degree≤1.2mbar, argon gas circulation 60Nm are opened3/ h, 12~15min of time；It closes Aurification vacuum degree 1.5mbar, argon gas circulation 50Nm3/h；Quiet circulation time >=8min；Oxygen blast phase 40~80mbar of vacuum degree, Argon gas circulation 50Nm3/h；
D. thermometric determines oxygen, adds in the ferrotianium 1.0kg/t steel of Ti contents 70%, and thermometric sampling is outbound；
E. out-station temperature：It opens and pours 1618~1620 DEG C, even 1600~1610 DEG C of casting ladle time；The outbound chemical compositions of RH are shown in Table 4.
Table 4：The outbound chemical compositions of RH (wt%)
(5) CC conventional plate blanks continuous casting working procedure：A. ladle adds argon gas-sealed to protect molten steel, long water to tundish using long nozzle Molten steel cannot be exposed at mouthful；When ladle is to basket pouring molten steel, forbid slag；
B. middle packet uses carbon-free magnesium refractory, carbon-free aluminum Argon filling pipe end and Argon stopper, uses carbon-free double-deck covering Agent；
C. the submersed nozzle that crystallizer is optimized using carbon-free, low alkalinity, high-viscosity covering slag, structure and material；
D. two is cold using the strong types of cooling of C1.
The technological parameter of this process is shown in Table 5；The chemical composition of gained IF steel product is shown in Table 6.
Table 5：The technological parameter of CC conventional plate blank continuous casting working procedures
Table 6：IF steel product 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
3rd, there is not centre burst, center porosity and center segregation in various embodiments of the present invention production continuous casting billet macroscopic examination The defects of, casting billet surface and subcutaneously without dreg defect；Hot-rolled sheet coil excellent surface quality；The performance of gained IF steel product is shown in Table 7。
Table 7：IF steel product performance profiles
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 (3)

1. a kind of production technology of high-quality ultra low carbon IF steel, it is characterised in that：It include blast-melted, DeS pretreatment desulfurizings, DeP dephosphorizations, DeC decarburizations, RH application of vacuum and CC conventional plate blank continuous casting working procedures；The DeP dephosphorizations process：Outlet temperature >=1330 DEG C, the mass percent of control half composition of steel of terminal is：C 3.40~3.60%, S≤0.010%, P≤0.040%, finishing slag basicity It is 1.8~2.0, time≤7 minute of tapping；The DeC decarbonization process, using stove does not go out directly, control endpoint molten steel ingredient Mass percent：C 0.025~0.040%, S≤0.011%, P≤0.010%, 1680~1700 DEG C of outlet temperature, finishing slag basicity It is 3.2~3.6, big 1660~1680 DEG C of packet temperature, hit at first time terminal P；1680~1700 DEG C of outlet temperature, terminal oxygen position 550~800ppm, finishing slag FeO mass percent≤20%, time >=3 minute of tapping；The RH application of vacuum process, using true Empty mechanical pump adjusts vacuum degree；The CC conventional plate blanks continuous casting working procedure, tundish use carbon-free magnesium refractory, and casting speed control is 1.1~1.4m/min.
2. the production technology of high-quality ultra low carbon IF steel according to claim 1, which is characterized in that the RH application of vacuum Process：1635~1650 DEG C of inlet temperature, enter the station 550~700ppm of oxygen position；Outbound chemical composition mass percent：C≤ 0.0030%th, Mn 0.10~0.20%, S≤0.012%, P≤0.013%, Si≤0.03%, Als 0.020~0.050%, Ti 0.055~0.070%；1600~1620 DEG C of out-station temperature.
3. the production technology of high-quality ultra low carbon IF steel according to claim 1 or 2, which is characterized in that the CC is conventional Sheet billet continuous casting process：1555~1575 DEG C of molten steel temperature in tundish；Tundish uses slag blocking wall or slag weir, baking of tundish Temperature >=1100 DEG C, baking time >=4h；Using carbon-free double-deck coverture, secondary cooling uses the strong type of cooling, ensures simultaneously Straightening temperature >=800 DEG C.
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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
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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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

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* 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

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