CN105861913B - The method that middle sheet billet continuous casting produces 700MPa ferrito-martensite dual phase steels - Google Patents
The method that middle sheet billet continuous casting produces 700MPa ferrito-martensite dual phase steels Download PDFInfo
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- CN105861913B CN105861913B CN201610372239.0A CN201610372239A CN105861913B CN 105861913 B CN105861913 B CN 105861913B CN 201610372239 A CN201610372239 A CN 201610372239A CN 105861913 B CN105861913 B CN 105861913B
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- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Abstract
The invention discloses a kind of method that middle sheet billet continuous casting produces 700MPa ferrito-martensite dual phase steels, comprise the steps：Desulfurizing iron → dephosphorization converter smelting → decarburization converter smelting → LF processing → RH degassing process → middle sheet billet continuous casting.The middle sheet billet continuous casting technique productions 700MPa ferrito-martensite dual phase steels that the present invention is matched using duplex converter, by controlling each operation technological parameter, desired continuous casting billet is met to produce, hot rolling production high-quality hot-rolled coil, through cold rolling final production high-quality continuous annealing product.
Description
Technical field
The present invention relates to a kind of method that middle sheet billet continuous casting produces 700MPa ferrito-martensite dual phase steels, belong to steel smelting
Refine technical field.
Background technology
In recent years, with the fast development of Chinese Auto Industry, energy-conserving and environment-protective turn into the inexorable trend that Hyundai Motor develops,
One of important measures are exactly vehicle weight lightweight, replace routine steel each at home using high strength dual phase steel
Large enterprises are researched and developed one after another, ferrito-martensite dual phase steel one kind exactly therein, and the dual phase steel is in its solid solution structure
Martensite content reaches 35-50%, and remaining is ferrite.The composition of current 700MPa ferrito-martensite dual phase steels can be controlled
In [N] 0.0040%, [S] 0.005%, [P] 0.018% T [O] 0.0030%, strand segregation reaches less than B0.5 grades
Level.700MPa ferrito-martensite dual phase steel production technologies mainly have： A：Blast furnace → desulfurizing iron → converter → LF → RH takes off
Gas disposal → continuous casting B：Blast furnace → converter → LF → RH degassing process → continuous casting.It is recognized in the art that：700MPa ferrites,
The problem of Major Difficulties of martensite dual-phase steel steel-making are control strand segregation, and control strand segregation in middle slab caster
Low overheat, slighter compress, electromagnetic agitation three measures mainly are taken, low overheat and slighter compress are only such as being taken without electromagnetic agitation
Under conditions of control the 700MPa high-quality dual phase steel strand segregation difficulty larger, the control of low overheat relies primarily on ladle storage
Hot temperature drop is controlled, if BOF nominal capacity is smaller, and the process molten steel temperature drop of whole steel making working procedure is difficult accurate control,
Cause molten steel degree of superheat control in casting cycle higher, it is impossible to be effectively accurately controlled to tundish temperature, in addition in molten steel
[S] and [P] also strand segregation is had a certain impact, how to reduce to greatest extent [S], [P] in molten steel be also steel-making
One difficult point.
The content of the invention
The present invention provides a kind of method that middle sheet billet continuous casting produces 700MPa ferrito-martensite dual phase steels, using 100 tons
The middle sheet billet continuous casting technique productions 700MPa ferrito-martensite dual phase steels that duplex converter matches, by controlling each operation technique
Parameter, desired continuous casting billet is met to produce, hot rolling production high-quality hot-rolled coil, through cold rolling final production high-quality continuous annealing product.
The technical solution used in the present invention is：
The method that middle sheet billet continuous casting produces 700MPa ferrito-martensite dual phase steels, comprises the steps：Desulfurizing iron →
100t dephosphorization converters smelting → 100t decarburizations converter smelting → LF processing → RH degassing process → middle sheet billet continuous casting；
Wherein, desulfurizing iron, be ladle injection magnesium powder and lime desulfurization after, bits are scratched clean, enter stove molten iron [S]≤
0.006%；
Dephosphorization converter is smelted, and finishing slag basicity is 1.3-1.8；Half steel water management Ingredient percent [C]:3.6-4.0%,
[S]≤0.007%, [P]≤0.040%；1310-1360 DEG C of outlet temperature, finishing slag（FeO）Mass percent≤12%, taps the time
≤ 7 minutes；
Decarburization converter smelting, finishing slag basicity is 3.2-3.6；Molten steel control composition mass percent [C]:0.03-0.04%,
[S]≤0.008%, [P]≤0.008%；1680-1700 DEG C of outlet temperature, finishing slag (FeO) mass percent≤20% is tapped the time
>=3 minutes；
LF processing：Molten steel control composition mass percent [C]:0.08-0.10%, [Mn]：1.90-2.00%, [Si]：
1.10-1.20%, [S]≤0.003%, [P]≤0.015%：
RH degassing process, 1630-1650 DEG C of inlet temperature, degassing and trimming；Outbound chemical composition mass percent：
[C]:0.08-0.10%, [Mn]：1.90-2.00%, [Si]：1.10-1.20%, [S]≤0.003%, [P]≤0.015%：[Als]:
0.032-0.050%, out-station temperature is poured according to casting blank section and even depending on heat；
Middle sheet billet continuous casting：1531-1546 DEG C of molten steel temperature in tundish；Tundish uses slag blocking wall, slag weir, tundish
Baking temperature >=1100 DEG C, baking time >=3 hour, tundish uses magnesium refractory, aluminium carbonaceous filling pipe end, aluminium carbonaceous stopper and
Submersed nozzle；Using carbon-free low silicon coverture, crystallizer uses high alkalinity, low viscosity peritectic steel covering slag, and secondary cooling is adopted
With the refrigerating mode being combined with dynamic soft-reduction, while ensureing straightening temperature >=900 DEG C；Middle Baogang's water oxygen, nitrogen content quality
Numerical control is made as T [O]≤25ppm, [N]≤40ppm, and the degree of superheat is controlled at 20-30 DEG C.
Pretreatment is combined with LF desulfurization, it is ensured that outbound [S]≤0.003% of LF, and duplex converter smelting ensures dephosphorization effect,
Decarburization converter terminal P is controlled within 0.008%.Kept off using after slide plate front, slag retaining cone and slide plate, slag thickness≤30mm；It is de-
Carbon converter is using silicomangan with manganese, with silicon, and ferrosilicon matches somebody with somebody silicon；3.5-4.5 kgs/tonne of steel of lime adding amount；During tapping molten steel 1/3
Start charging, if using first rear strong charging sequence：Lime → ferrosilicon → silicomangan → ferro-aluminum；Alloy is added before tapping 3/4
And slag making materials, tapping, which is finished, adds ferro-aluminum deoxidation.
Middle sheet billet continuous casting, no electromagnetic agitation, using dynamic soft-reduction, ladle to tundish adds argon gas-sealed using long nozzle
Protect molten steel, pulling rate 1.2-1.5m/min.
The continuous casting billet of the present invention can be with hot rolled production hot-rolled coil, through cold rolling final production continuous annealing product；
Controlling of production process of the present invention is stable, and continuous casting slab segregation reaches less than B0.5 grades.
In middle slab caster production 700MPa ferrites, martensite dual-phase steel, to accomplish continuous casting process direct motion, it is to avoid in
The excessive influence to technical process and product quality of bag level fluctuation, it is narrow into sub-control to dephosphorization, the control of decarburization converter terminal, LF
System, RH degassing process, whole process temperature control and Continuous Casting Soft Reduction, which are used, proposes higher requirement, that is, must be to whole
Individual each technology key point of flow is precisely controlled, and can just produce the flawless continuous-casting billet for meeting and requiring.
It is using the beneficial effect produced by above-mentioned technical proposal：
The middle sheet billet continuous casting technique productions 700MPa ferrito-martensite dual phase steels that the present invention is matched using duplex converter,
By controlling each operation technological parameter, it is to avoid the middle excessive influence to technical process and product quality of bag level fluctuation, to dephosphorization,
The control of decarburization converter terminal, LF Narrow Composition Controls, RH degassing process, desired continuous casting billet is met to produce, and hot rolled production is excellent
Matter hot-rolled coil, through cold rolling final production high-quality continuous annealing product.
Brief description of the drawings：
Fig. 1 is low power sample center segregation map after the continuous casting billet erosion of embodiment 1；
Fig. 2 is low power sample center segregation map after the continuous casting billet erosion of embodiment 2；
Fig. 3 is low power sample center segregation map after the continuous casting billet erosion of embodiment 3；
Fig. 4 is low power sample center segregation map after the continuous casting billet erosion of embodiment 4；
Fig. 5 is low power sample center segregation map after the continuous casting billet erosion of embodiment 5.
Embodiment
The present invention is described further with reference to embodiment；
In embodiment, the technological process of middle sheet billet continuous casting production dual phase steel is：Desulfurizing iron → dephosphorization converter smelting →
Decarburization converter smelting → LF processing → RH degassing process → middle sheet billet continuous casting
Converter 100t, RH refining 100t in embodiment 1-5, middle sheet billet continuous casting（Without electromagnetic agitation）：The wide 800- of continuous casting billet
1550mm, thick 200mm, using dynamic soft-reduction, production steel grade GFL780HX.
Concrete operation step and each operation process parameter control are as follows in embodiment 1-5：
（1）Desulfurizing iron
Ladle is blown after magnesium powder and lime desulfurization, and bits are scratched clean, enter stove molten iron [S]≤0.006%；
（2）Dephosphorization converter is smelted
A. 1350 DEG C of molten iron temperature, [S]=0.007%, [P]=0.150%, converting process bottom blowing whole process nitrogen；
B. converting process is using dephosphorization as main target, it is desirable to which the steady slugging of early stage, furnace temperature steadily rises；
C. blowing later stage oxygen supply is mixed using oxygen nitrogen, so as to not only reduce splash, also act as the purpose for protecting carbon；
D. finishing slag basicity is 1.3-1.8；Half steel water management Ingredient percent [C]:3.6-4.0%, [S]≤0.007%,
[P]≤0.040%；1310-1360 DEG C of outlet temperature, finishing slag（FeO）Mass percent≤12%, time≤7 minute of tapping.Using
Slag stopping pushing off the slag, slag thickness≤50mm, tapping process need not add any material.
（3）Decarburization converter smelting
A. 1380 DEG C of molten iron temperature, [C]=3.6%, [S]=0.007%, [P]=0.040%；
B. converting process is using decarburization, terminal point control as main target, it is desirable to which whole slugging, furnace temperature steadily rises；
C. finishing slag basicity R is 3.2-3.6, molten steel composition（Mass percent）[C]:0.03-0.04%, [S]≤0.008%,
[P]≤0.008%；Finishing slag (FeO) mass percent≤20%;
Outlet temperature：1680-1700 DEG C, bottom blowing is quiet after catch carbon blows 140 seconds, quiet bottom blowing flow 0.17m when blowing3/ t*min,
Converting process bottom blowing nitrogen argon switches to 30%.
D. use of tapping is used in conjunction, clean refining capping ladle；
E. using gear, slag thickness≤30mm after slide plate front, slag retaining cone and slide plate；
F. tap time >=3 minute, steel stream rounding.
G. silicomangan addition is 3000kg/ stoves, and ferrosilicon addition is 850kg/ stoves；Lime adding amount 3.5-4.0 is public
Jin/ton steel；Start charging during tapping molten steel 1/3, charging sequence is lime → ferrosilicon → silicomangan → ferro-aluminum；Before tapping 3/4
Slag making materials and alloy are added, tapping finishes addition ferro-aluminum deoxidation.
（4）LF Narrow Composition Control processes
A. ladle enters the station, plus slag material and thermometric, 1600 DEG C of temperature；Sampling analysis composition；
B. according to slag beneficiation and molten steel Als contents, aluminium is once mended, it is desirable to Als targets：400-500ppm
C. manganeisen is selected according to [C] content that enters the station, such as [C]≤0.08%, is added high carbon ferromanganese and is matched somebody with somebody manganese, [C] ＞
0.08%, mid-carbon fe-mn or silicomangan are added, matches somebody with somebody silicon using ferrosilicon.Element alloyed order Mn → Si → C
D.LF outbound [S] is controlled 0.001%, and outbound [P] is controlled 0.013,0.014%.
F. molten steel control composition mass percent [C]:0.08-0.10%, [Mn]：1.90-2.00%, [Si]：1.10-
1.20%, [S]≤0.003%, [P]≤0.015%；
（5）RH degassing process processes
A. ladle enters the station, thermometric, 1630-1650 DEG C of temperature；
B. vavuum pump is opened, is recycled to 15 minutes, maximum vacuum 1.2mPa, thermometric sampling analysis composition；
C. according to sampling analysis result, [C], [Mn], [Si] element in molten steel are micro-adjusted；
D. out-station temperature：Because BOF nominal capacity is small, production section and ladle accumulation of heat situation are carried out with out-station temperature
Temperature is then adjusted in classification, RH by circulation time, and RH out-station temperatures are shown in Table the outbound chemical compositions of 1, RH and are shown in Table 2：
The RH out-station temperatures of table 1
| Section, mm | First bag, DEG C | 2-3 stoves, DEG C | 4-10 stoves, DEG C | After 11st stove, DEG C |
| ≤1050 | 1595-1605 | 1580-1590 | 1575-1585 | 1570-1580 |
| 1051-1150 | 1595-1605 | 1580-1590 | 1575-1585 | 1570-1580 |
| 1151-1300 | 1595-1605 | 1575-1585 | 1570-1580 | 1565-1575 |
| ≥1301 | 1595-1605 | 1575-1585 | 1570-1580 | 1565-1575 |
The outbound chemical composition % of the RH of table 2
| GFL780HX steel grades | C | Mn | S | P | Si | Als | N | H |
| Embodiment 1 | 0.091 | 1.935 | 0.003 | 0.014 | 1.164 | 0.050 | 0.0025 | 0.0002 |
| Embodiment 2 | 0.084 | 1.947 | 0.001 | 0.014 | 1.20 | 0.046 | 0.0026 | 0.0003 |
| Embodiment 3 | 0.080 | 2.00 | 0.001 | 0.013 | 1.186 | 0.046 | 0.0023 | 0.0001 |
| Embodiment 4 | 0.095 | 1.91 | 0.001 | 0.014 | 1.10 | 0.045 | 0.003 | 0.0003 |
| Embodiment 5 | 0.010 | 1.90 | 0.001 | 0.014 | 1.177 | 0.032 | 0.0025 | 0.0002 |
（6）Middle sheet billet continuous casting process
A. 1531-1546 DEG C of molten steel temperature in tundish, ladle to tundish adds argon gas-sealed to protect molten steel using long nozzle,
Molten steel can not be exposed at long nozzle；When ladle is to basket pouring molten steel, it is impossible to slag；Tundish uses slag blocking wall, slag weir,
Baking of tundish temperature >=1100 DEG C, baking time >=3 hour；
B. middle bag uses magnesium refractory, and carbon-free aluminum Argon filling pipe end and Argon stopper use carbon-free low silicon coverture；
C. crystallizer uses high alkalinity, low viscosity peritectic steel covering slag, uses magnesium refractory, aluminium carbonaceous filling pipe end, aluminium carbon
Matter stopper and submersed nozzle；
D. pulling speed of continuous casting is is classified according to section, and specific classification is shown in Table 3；
The pulling speed of continuous casting classification chart of table 3
| Section, mm | Pulling rate, m/min |
| ≤1050 | 1.40-1.50 |
| 1051-1150 | 1.30-1.40 |
| 1151-1300 | 1.20-1.30 |
| ≥1301 | 1.20-1.30 |
E. two is cold using the refrigerating mode being combined with dynamic soft-reduction, while ensureing straightening temperature >=900 DEG C.
By the GFL780HX steel final products chemical analysis such as table 4 of above-mentioned technique productions：
The GFL780HX product made from steel chemical analysis of table 4（%）
| GFL780HX steel grades | C | Mn | S | P | Si | Als | N | O |
| Embodiment 1 | 0.09 | 1.96 | 0.001 | 0.014 | 1.16 | 0.054 | 0.0025 | 0.0015 |
| Embodiment 2 | 0.09 | 1.97 | 0.001 | 0.014 | 1.2 | 0.044 | 0.0033 | 0.0012 |
| Embodiment 3 | 0.09 | 1.96 | 0.001 | 0.014 | 1.2 | 0.042 | 0.0025 | 0.0010 |
| Embodiment 4 | 0.1 | 1.93 | 0.001 | 0.015 | 1.16 | 0.038 | 0.0035 | 0.0015 |
| Embodiment 5 | 0.1 | 1.93 | 0.001 | 0.013 | 1.2 | 0.041 | 0.0034 | 0.0014 |
F. middle Baogang's water oxygen, the control of nitrogen content mass number are T [O]≤25ppm, [N]≤40ppm, and degree of superheat control exists
20-30 DEG C of tundish temperature and degree of superheat control data are shown in Table 5：
The GFL780HX steel tundish temperature of table 5 and the degree of superheat（℃）
| Steel grade | Open and pour 10 minutes | Open and pour 20 minutes | Open and pour 30 minutes | The degree of superheat |
| Embodiment 1 | 1540 | 1538 | 1535 | 30 |
| Embodiment 2 | 1539 | 1532 | 1532 | 26 |
| Embodiment 3 | 1532 | 1531 | 1529 | 23 |
| Embodiment 4 | 1530 | 1536 | 1539 | 27 |
| Embodiment 5 | 1532 | 1530 | 1539 | 20 |
G. center segregation is controlled
To detect the strand gross segregation situation after application this method, embodiment 1-5 product sampling is subjected to detection point
Analysis, takes continuous casting billet low power sample, low power sample is cut after continuous blank-discharging using flame cutting machine, low power sample sampling size size
And corrosion method is according to GB226-1991《The macrostructure and defect acid etching detection method of steel》Perform, rating scale is according to YB/
T4003-1997 《Continuous casting plate slab macrostructure defect judge picture》Evaluated.
The steel grade GFL780HX pulling rate 1.4m/min of embodiment 1, produce section：1015 × 200mm, 30 DEG C of the degree of superheat, is invaded
Low power sample center segregation such as Fig. 1, belongs to C1.0 grades after erosion.
The steel grade GFL780HX pulling rate 1.2m/min of embodiment 2, produce section：1285 × 200mm, 26 DEG C of the degree of superheat, is invaded
Low power sample center gross segregation such as Fig. 2, belongs to B0.5 grades after erosion.
The steel grade GFL780HX pulling rate 1.2m/min of embodiment 3, produce section：1220 × 200mm, 23 DEG C of the degree of superheat corrodes
Low power sample center gross segregation such as Fig. 3, belongs to C1.0 grades afterwards.
The steel grade GFL780HX pulling rate 1.3m/min of embodiment 4, produce section：1400 × 200mm, 27 DEG C of the degree of superheat, is invaded
Low power sample center gross segregation such as Fig. 4, belongs to B0.5 grades after erosion.
The steel grade GFL780HX pulling rate 1.4m/min of embodiment 5, produce section：1015 × 200mm, 20 DEG C of the degree of superheat, is invaded
Low power sample center gross segregation such as Fig. 5, belongs to C0.5 grades after erosion.
From the point of view of embodiment 1-5 continuous casting billet macroscopic examination result, there is not centre burst and center porosity in continuous casting billet,
Center segregation reaches B0.5 grades of following, casting billet surface and subcutaneously no dreg defects；Hot-rolled sheet coil excellent surface quality.
Claims (4)
1. a kind of method that middle sheet billet continuous casting produces 700MPa ferrito-martensite dual phase steels, it is characterised in that：Including following steps
Suddenly：Desulfurizing iron → dephosphorization converter smelting → decarburization converter smelting → LF processing → RH degassing process → middle sheet billet continuous casting；
The desulfurizing iron：It is blown for ladle after magnesium powder and lime desulfurization, bits is scratched clean, enter stove molten iron [S]≤0.006%；
The dephosphorization converter is smelted:Finishing slag basicity is 1.3-1.8；Half steel water management Ingredient percent [C]:3.6-4.0%,
[S]≤0.007%, [P]≤0.040%；1310-1360 DEG C of outlet temperature, finishing slag FeO mass percent≤12%, the tapping time≤
7 minutes；
The decarburization converter smelting：Finishing slag basicity is 3.2-3.6；Molten steel control composition mass percent [C]:0.03-0.04%,
[S]≤0.008%, [P]≤0.008%；1680-1700 DEG C of outlet temperature, finishing slag FeO mass percent≤20%, the tapping time >=
3 minutes；
The LF processing：Molten steel control composition mass percent [C]:0.08-0.10%, [Mn]：1.90-2.00%, [Si]：
1.10-1.20%, [S]≤0.003%, [P]≤0.015%：
The RH degassing process：1630-1650 DEG C of inlet temperature, degassing and trimming；Outbound chemical composition mass percent：
[C]:0.08-0.10%, [Mn]：1.90-2.00%, [Si]：1.10-1.20%, [S]≤0.003%, [P]≤0.015%：[Als]:
0.032-0.050%, out-station temperature is poured according to casting blank section and even depending on heat；
The middle sheet billet continuous casting：1531-1546 DEG C of molten steel temperature in tundish；Tundish uses slag blocking wall, slag weir, tundish
Baking temperature >=1100 DEG C, baking time >=3 hour, tundish uses magnesium refractory, aluminium carbonaceous filling pipe end, aluminium carbonaceous stopper and
Submersed nozzle；Using carbon-free low silicon coverture, crystallizer uses high alkalinity, low viscosity peritectic steel covering slag；Middle Baogang's water oxygen,
The control of nitrogen content mass number is T [O]≤25ppm, [N]≤40ppm, and the degree of superheat is controlled at 20-30 DEG C.
2. the method that middle sheet billet continuous casting according to claim 1 produces 700MPa ferrito-martensite dual phase steels, its feature
It is the decarburization converter smelting, terminal P is controlled within 0.008%, is kept off using after slide plate front, slag retaining cone and slide plate, slag
Thickness≤30mm；Decarburization converter is using silicomangan with manganese, with silicon, and ferrosilicon matches somebody with somebody silicon；3.5-4.5 kgs/tonne of steel of lime adding amount；
Start charging during tapping molten steel 1/3, using first weak rear strong charging sequence：Lime → ferrosilicon → silicomangan → ferro-aluminum；Tapping
Alloy and slag making materials are added before 3/4, tapping finishes addition ferro-aluminum deoxidation.
3. the method that middle sheet billet continuous casting according to claim 1 produces 700MPa ferrito-martensite dual phase steels, its feature
It is the middle sheet billet continuous casting, no electromagnetic agitation, using dynamic soft-reduction, ladle to tundish adds argon gas-sealed using long nozzle
Protect molten steel, pulling rate 1.2-1.5m/min.
4. the method that middle sheet billet continuous casting according to claim 1 produces 700MPa ferrito-martensite dual phase steels, its feature
It is that secondary cooling uses the refrigerating mode being combined with dynamic soft-reduction in the middle sheet billet continuous casting process, while ensureing straightening
Temperature >=900 DEG C.
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| CN107794444A (en) * | 2017-10-16 | 2018-03-13 | 首钢京唐钢铁联合有限责任公司 | Strong cold-rolled biphase steel of carbon silicomanganese system superelevation and preparation method thereof |
| CN108568503B (en) * | 2018-04-27 | 2020-11-03 | 唐山钢铁集团有限责任公司 | Method for accurately controlling carbon content of molten steel in 600MPa dual-phase steel tundish |
| CN112795834B (en) * | 2020-11-19 | 2021-12-03 | 唐山钢铁集团有限责任公司 | Production method of medium-carbon, medium-silicon and high-aluminum dual-phase steel continuous casting billet |
| CN115572890B (en) * | 2021-06-21 | 2023-06-09 | 上海梅山钢铁股份有限公司 | Production method of low-sulfur peritectic steel continuous casting slab |
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| US3729344A (en) * | 1971-03-12 | 1973-04-24 | Carpenter Technology Corp | Process for making thermally hardened wrought stainless steel shaped member having a duplex ferritic/martensitic microstructure |
| US4047941A (en) * | 1974-09-23 | 1977-09-13 | Allegheny Ludlum Industries, Inc. | Duplex ferrit IC-martensitic stainless steel |
| CN100430507C (en) * | 2005-08-31 | 2008-11-05 | 宝山钢铁股份有限公司 | 700MPa grade high ductility low-yield ratio thick steel plate and manufacture method thereof |
| CN100357474C (en) * | 2006-02-17 | 2007-12-26 | 东北大学 | Tensile strength 600Mpa grade dual phase steel plate and its production method |
| CN100439545C (en) * | 2006-03-27 | 2008-12-03 | 宝山钢铁股份有限公司 | 800 MPa level thick steel plate with high toughness and low yield ratio and its making process |
| CN102899587B (en) * | 2011-07-25 | 2015-01-21 | 宝山钢铁股份有限公司 | Double phase stainless steel and manufacturing method thereof |
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