CN105463316A - Method for producing ultra-low carbon steel on basis of flexible thin slab casting (FTSC) - Google Patents
Method for producing ultra-low carbon steel on basis of flexible thin slab casting (FTSC) Download PDFInfo
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Abstract
The invention discloses a method for producing ultra-low carbon steel on the basis of flexible thin slab casting (FTSC). The method includes the following steps of (1) molten iron desulfurization, (2) smelting with a converter, (3) Ruhstahl Hausen (RH) vacuum treatment and (4) FTSC. The ultra-low carbon steel comprises, by mass, 0-0.010% of C, 0.06%-0.35% of Mn, 0.12%-0.28% of Si, 0-0.020% of P, 0-0.020% of S, 0-0.09% of Ti, 0-0.0050% of N, and the balance iron and inevitable impurities. According to the method, the ultra-low carbon steel is produced through FTSC, the components, suitable for FTSC production, of the ultra-low carbon steel are redesigned, and ultra-low carbon steel continuous casting slabs meeting the performance requirement are produced by strictly controlling process parameters of all procedures of steel making.
Description
Technical field
The present invention relates to technical field of smelting, especially a kind of method of producing ultra low-carbon steel based on FTSC sheet blank continuous casting.
Background technology
Ultra low-carbon steel is mainly used on the structural part of deep draw requirement, as automobile structure and various baroque other components and parts etc. of structural shape complexity.All these structural parts are generally to deliver goods after the smooth or company's strip zinc after pickling and cold-rolling, annealing, and its applied range, requires to have high-elongation, high n-value and r value.
Current production ultra low-carbon steel mainly contains following three productions technique.The first: blast furnace → desulfurizing iron → top and bottom combined blown converter → RH vacuum → conventional plate blank (slab thickness >=200mm) continuous casting; The second: blast furnace → desulfurizing iron → converter smelting → RH vacuum → LF refining → CSP sheet blank continuous casting (also referred to as duplex technique); The third: blast furnace → desulfurizing iron → converter smelting → RH vacuum → CSP sheet blank continuous casting.The first Technology is very ripe, its stable processing technique, and product performance are excellent, but facility investment is large, and the production cycle is long, and production cost is high.It is large that the carbon of its molten steel of the second technique, silicon precisely control difficulty, and molten steel carburetting in molten steel after LF refining, to increase silicon obvious, and product composition fluctuation is comparatively large, and hit rate is low, unstable properties.During the ultra low-carbon steel of the third explained hereafter; if do not carry out Calcium treatment in RH treatment process, when thin slab upper, pourability of molten steel is poor, causes nozzle clogging; affect the sequence casting of sheet blank continuous casting, constrain the large-scale production of ultra low-carbon steel in thin slab flow process.A large amount of production practice prove: thin slab cast ultra low-carbon steel, must carry out Calcium treatment to molten steel, and when producing ultra low-carbon steel, ladle top slag oxidisability is strong, it is large that Calcium treatment controls difficulty, effect is also unstable, controls long nozzle blocking with great difficulty not to occur, and causes unplanned stopping to be watered, have a strong impact on stably manufactured, and the duplex explained hereafter cycle is long, temperature loss is large, considerably increases production cost.
In addition, three kinds of above-mentioned explained hereafter ultra low-carbon steels, Si≤0.03% in general control steel, when adopting galvanizing, the silicone content in steel matrix becomes wave to change to the thickness of coating and color and luster, i.e. San Andreas Rift.Galvanizing generally needs to soak 2-3 minute, and the continuous zinc coating reaction times only has 3-5 second, needs to reappraise on zinc-plated impact for continuous zinc coating production technique silicone content.
Summary of the invention
The invention provides a kind of method of producing ultra low-carbon steel based on FTSC sheet blank continuous casting, FTSC sheet blank continuous casting is adopted to produce ultra low-carbon steel, and redesign the composition being applicable to the ultra low-carbon steel that FTSC sheet blank continuous casting is produced, increase the Si content in steel, calcium is brought into by adding calcic ferrosilicon, play the effect of indirect Calcium treatment, realize production meet performance requriements continuous casting of ultralow carbon steel base by strictly controlling to make steel each procedure technology parameter.
The technical solution used in the present invention is:
Produce a method for ultra low-carbon steel based on FTSC sheet blank continuous casting, comprise the steps:
(1) desulfurizing iron: skim after hot metal ladle winding-up granular magnesium, enter stove molten iron S≤0.003%;
(2) converter smelting: finishing slag basicity is 3.5-4.0; Molten steel control composition mass percent is: C:0.03-0.06%, S≤0.010%, P≤0.012%; Terminal temperature
1680-1720dEG C, terminal oxygen position: 600-800ppm, finishing slag FeO mass percent 22%-28%, tapping time 5-6 minute;
(3) RH vacuum-treat: inlet temperature 1630-1650 DEG C, enter the station oxygen position: 500-700ppm, decarburization, component controlling; Out-station temperature: 1590-1610 DEG C; Every stove adds calcic ferrosilicon 1.0-3.0 kg/tonne of steel;
Departures chemical composition mass percent is: C≤0.0096%, Mn0.06-0.35%, S≤0.018%, P≤0.018%, Si:0.12-0.26%, Als0.025-0.060%, Ti≤0.09%;
(4) FTSC sheet blank continuous casting: molten steel temperature in tundish 1562-1576 DEG C; Tundish adopts slag blocking wall, slag weir, baking of tundish temperature 1250-1280 DEG C, baking time 4-4.5 hour;
The mass percent of ultra low-carbon steel composition is: C≤0.010%; Mn0.06-0.35%; Si0.12-0.28%; P≤0.020%; S≤0.020%; Ti≤0.09%; N≤0.0050%; All the other are iron and inevitable impurity.
Preferred technical scheme is: converter smelting, RH vacuum-treat and FTSC sheet blank continuous casting, and middle Baogang water oxygen, Control of Nitrogen Content are [O]≤40ppm, [N]≤40ppm.
Slag stopping pushing off the slag is adopted, slag thickness≤50mm in step (2); High carbon ferromanganese joins manganese; High carbon ferromanganese add-on is 1.0-1.1Kg/ ton steel; Lime adding amount: 1.5-2.0 kg/tonne steel; Start to feed in raw material during tapping molten steel 1/4, add high carbon ferromanganese, lime successively; Add before tapping 3/4, tapping process closes steel ladle bottom argon blowing.
In step (4), ladle adopts long nozzle to add argon gas-sealed protection molten steel to tundish.
In step (4), tundish uses carbon-free magnesium-aluminium dry materials, carbon-free aluminium matter stopper and the whole immersion type mouth of a river.
In step (4), cooling twice adopts the strong type of cooling, straightening temperature 850-950 DEG C.
The pulling rate of step (4) continuous casting of middle-thin slabs is 4.0-4.5m/min.
Ultra low-carbon steel is produced at FTSC thinslab casting, must continuous casting process direct motion, the techniques such as converter terminal controls, the control of RH tupe, whole process temperature and the resistance to material of continuous casting are precisely controlled, just can produce the flawless continuous-casting billet met the demands.
Calcic ferrosilicon is commercially available prod, wherein Si:74.0-80.0%, Ca:0.8-1.2%, for ferrosilicon, wherein calcium is impurity element, the present invention is by adding the Si content in calcic ferrosilicon increase steel, and calcic ferrosilicon brings calcium into simultaneously, utilizes impurity element calcium to play the effect of indirect Calcium treatment.
The present invention is according to the feature of the follow-up continuous zinc coating production technique of FTSC CSP, redesign the composition of ultra low-carbon steel, by adding the Si content in calcic ferrosilicon increase steel, indirectly carry out Calcium treatment, and the strict each procedure technology parameter of steel-making that controls produces the continuous casting of ultralow carbon steel base meeting performance requriements.
Utilize existing top and bottom combined blown converter, RH vacuum-treat, produce the ultra low-carbon steel meeting the low-cost high-quality of standard-required at FTSC thinslab casting.
The duplex explained hereafter cycle is long, and temperature loss is large, and production cost is high, the present invention is a kind of thin slab simply connected (only through RH vacuum-treat) technique, and flow process is short, cost is low, by improving Si content in steel, bring calcium into calcic ferrosilicon, indirectly play the effect of Calcium treatment, improve the castability of molten steel.In actual production, control Si:0.20% in steel, in steel, Ca content can reach 15ppm, and effectively solve ultra low-carbon steel nozzle clogging problem, continuous casting production process is stablized, and the quality product of the galvanized sheet obtained is suitable containing the quality product of Si≤0.03% with duplex technique.
The beneficial effect adopting technique scheme to produce is:
The present invention adopts FTSC thin slab casting, redesigns the composition of ultra low-carbon steel, improves Si content in steel, brings calcium into, indirectly carry out Calcium treatment with calcic ferrosilicon, and each working procedure parameter of strict control produces continuous casting of ultralow carbon steel base, and flow process is short, cost is low.
Embodiment
Below by embodiment, the present invention will be further described.
In following examples, converter 150t, RH refining 150t, FTSC sheet blank continuous casting: the wide 1000-1600mm of continuously cast bloom, the thick 70mm of strand, production steel grade is ultra low-carbon steel.
Converter smelting, RH vacuum-treat and FTSC sheet blank continuous casting, middle Baogang water oxygen, Control of Nitrogen Content are [O]≤40ppm, [N]≤40ppm.
Embodiment 1
(1) desulfurizing iron: skim after hot metal ladle winding-up granular magnesium, enter stove molten iron S≤0.003%;
(2) converter smelting:
A. molten iron temperature 1350 DEG C, S=0.003%, P=0.120%;
B. converting process is major objective with dephosphorization, and require full range slag, furnace temperature steadily rises;
C. finishing slag basicity is 3.85, molten steel composition (mass percent) C:0.05%, S:0.010%, P:0.008%; Terminal temperature: 1680 DEG C, terminal oxygen position: 700ppm;
D. tapping, use is used in conjunction, clean special RH refining ladle;
E. slag stopping pushing off the slag is adopted, slag thickness≤50mm; Finishing slag FeO mass percent 22%;
F. tap 5.8 minutes time, steel stream rounding.
G. high carbon ferromanganese add-on is 1.0Kg/ ton steel; Lime adding amount: 1.7 kgs/tonne of steel; Start to feed in raw material during tapping molten steel 1/4, add high carbon ferromanganese, lime successively; Add before tapping 3/4, tapping process closes steel ladle bottom argon blowing.
(3) RH vacuum-treat:
A. ladle enters the station, and thermometric determines oxygen, temperature 1638 DEG C, oxygen position: 562ppm; Sampling analysis composition;
B. open vacuum pump, be circulated to 26 minutes, vacuum tightness reaches 130Pa, thermometric sampling analysis composition;
C. after in steel, C, N, Ti, temperature meet the demands, every stove adds calcic ferrosilicon 1.2 kgs/tonne of steel, and circulate thermometric sampling departures in 2 minutes, and out-station temperature is: 1590 DEG C;
RH sets off chemical composition in table 1.
(4) FTSC sheet blank continuous casting:
A. molten steel temperature in tundish 1562 DEG C, ladle adopts long nozzle to add argon gas-sealed protection molten steel to tundish, and long nozzle place molten steel can not be exposed; When ladle is to basket pouring molten steel, can not slag; Adopt slag blocking wall, slag weir, baking of tundish temperature 1250 DEG C, baking time 4 hours.
B. tundish uses carbon-free magnesium-aluminium dry materials, carbon-free aluminium matter filling pipe end and stopper, uses carbon-free high alkalinity insulating covering agent;
C. crystallizer uses carbon-free high-viscosity covering slag, the whole immersion type mouth of a river.
D. pulling speed of continuous casting is 4.0m/min; Straightening temperature 850 DEG C.
E. two coldly the strong type of cooling is but adopted.
By the ultra low-carbon steel the finished product Chemical Composition of above-mentioned explained hereafter in table 2.
Embodiment 2
(1) desulfurizing iron: skim after hot metal ladle winding-up granular magnesium, enter stove molten iron S≤0.003%;
(2) converter smelting:
A. molten iron temperature 1350 DEG C, S=0.003%, P=0.120%;
B. converting process is major objective with dephosphorization, and require full range slag, furnace temperature steadily rises;
C. finishing slag basicity is 3.5, molten steel composition (mass percent) C:0.06%, S:0.009%, P:0.010%; Terminal temperature: 1700 DEG C, terminal oxygen position: 800ppm;
D. tapping, use is used in conjunction, clean special RH refining ladle;
E. slag stopping pushing off the slag is adopted, slag thickness≤50mm; Finishing slag FeO mass percent 23%;
F. tap 6 minutes time, steel stream rounding.
G. high carbon ferromanganese add-on is 1.1Kg/ ton steel; Lime adding amount: 2.0 kgs/tonne of steel; Start to feed in raw material during tapping molten steel 1/4, add high carbon ferromanganese, lime successively; Add before tapping 3/4, tapping process closes steel ladle bottom argon blowing.
(3) RH vacuum-treat:
A. ladle enters the station, and thermometric determines oxygen, temperature 1630 DEG C, oxygen position: 550ppm; Sampling analysis composition;
B. open vacuum pump, be circulated to 26 minutes, vacuum tightness reaches 130Pa, thermometric sampling analysis composition;
C. after in steel, C, N, Ti, temperature meet the demands, every stove adds calcic ferrosilicon 2.2 kgs/tonne of steel, and circulate thermometric sampling departures in 2 minutes, and out-station temperature is: 1600 DEG C;
RH sets off chemical composition in table 1.
(4) FTSC sheet blank continuous casting:
A. molten steel temperature in tundish 1568 DEG C, ladle adopts long nozzle to add argon gas-sealed protection molten steel to tundish, and long nozzle place molten steel can not be exposed; When ladle is to basket pouring molten steel, can not slag; Adopt slag blocking wall, slag weir, baking of tundish temperature 1260 DEG C, baking time 4.5 hours.
B. tundish uses carbon-free magnesium-aluminium dry materials, carbon-free aluminium matter filling pipe end and stopper, uses carbon-free high alkalinity insulating covering agent;
C. crystallizer uses carbon-free high-viscosity covering slag, the whole immersion type mouth of a river.
D. pulling speed of continuous casting is 4.5m/min; Straightening temperature 950 DEG C.
E. two coldly the strong type of cooling is but adopted.
By the ultra low-carbon steel the finished product Chemical Composition of above-mentioned explained hereafter in table 2
Embodiment 3
(1) desulfurizing iron: skim after hot metal ladle winding-up granular magnesium, enter stove molten iron S≤0.003%;
(2) converter smelting:
A. molten iron temperature 1350 DEG C, S=0.003%, P=0.120%;
B. converting process is major objective with dephosphorization, and require full range slag, furnace temperature steadily rises;
C. finishing slag basicity is 4.0, molten steel composition (mass percent) C:0.05%, S:0.007%, P:0.011%; Terminal temperature: 1720 DEG C, terminal oxygen position: 600ppm;
D. tapping, use is used in conjunction, clean special RH refining ladle;
E. slag stopping pushing off the slag is adopted, slag thickness≤50mm; Finishing slag FeO mass percent 28%;
F. tap 5 minutes time, steel stream rounding.
G. high carbon ferromanganese add-on is 1.05Kg/ ton steel; Lime adding amount: 1.8 kgs/tonne of steel; Start to feed in raw material during tapping molten steel 1/4, add high carbon ferromanganese, lime successively; Add before tapping 3/4, tapping process closes steel ladle bottom argon blowing.
(3) RH vacuum-treat:
A. ladle enters the station, and thermometric determines oxygen, temperature 1650 DEG C, oxygen position: 500ppm; Sampling analysis composition;
B. open vacuum pump, be circulated to 26 minutes, vacuum tightness reaches 130Pa, thermometric sampling analysis composition;
C. after in steel, C, N, Ti, temperature meet the demands, every stove adds calcic ferrosilicon 3.0 kgs/tonne of steel, and circulate thermometric sampling departures in 2 minutes, and out-station temperature is: 1610 DEG C;
RH sets off chemical composition in table 1.
(4) FTSC sheet blank continuous casting:
A. molten steel temperature in tundish 1570 DEG C, ladle adopts long nozzle to add argon gas-sealed protection molten steel to tundish, and long nozzle place molten steel can not be exposed; When ladle is to basket pouring molten steel, can not slag; Adopt slag blocking wall, slag weir, baking of tundish temperature 1270 DEG C, baking time 4.2 hours.
B. tundish uses carbon-free magnesium-aluminium dry materials, carbon-free aluminium matter filling pipe end and stopper, uses carbon-free high alkalinity insulating covering agent;
C. crystallizer uses carbon-free high-viscosity covering slag, the whole immersion type mouth of a river.
D. pulling speed of continuous casting is 4.3m/min; Straightening temperature 880 DEG C.
E. two coldly the strong type of cooling is but adopted.
By the ultra low-carbon steel the finished product Chemical Composition of above-mentioned explained hereafter in table 2
Embodiment 4
(1) desulfurizing iron: skim after hot metal ladle winding-up granular magnesium, enter stove molten iron S≤0.003%;
(2) converter smelting:
A. molten iron temperature 1350 DEG C, S=0.003%, P=0.120%;
B. converting process is major objective with dephosphorization, and require full range slag, furnace temperature steadily rises;
C. finishing slag basicity is 3.7, molten steel composition (mass percent) C:0.03%, S:0.008%, P:0.012%; Terminal temperature: 1690 DEG C, terminal oxygen position: 650ppm;
D. tapping, use is used in conjunction, clean special RH refining ladle;
E. slag stopping pushing off the slag is adopted, slag thickness≤50mm; Finishing slag FeO mass percent 26%;
F. tap 5.5 minutes time, steel stream rounding.
G. high carbon ferromanganese add-on is 1.0Kg/ ton steel; Lime adding amount: 1.5 kgs/tonne of steel; Start to feed in raw material during tapping molten steel 1/4, add high carbon ferromanganese, lime successively; Add before tapping 3/4, tapping process closes steel ladle bottom argon blowing.
(3) RH vacuum-treat:
A. ladle enters the station, and thermometric determines oxygen, temperature 1640 DEG C, oxygen position: 700ppm; Sampling analysis composition;
B. open vacuum pump, be circulated to 26 minutes, vacuum tightness reaches 130Pa, thermometric sampling analysis composition;
C. after in steel, C, N, Ti, temperature meet the demands, every stove adds calcic ferrosilicon 1.8 kgs/tonne of steel, and circulate thermometric sampling departures in 2 minutes, and out-station temperature is: 1595 DEG C;
RH sets off chemical composition in table 1.
(4) FTSC sheet blank continuous casting:
A. molten steel temperature in tundish 1576 DEG C, ladle adopts long nozzle to add argon gas-sealed protection molten steel to tundish, and long nozzle place molten steel can not be exposed; When ladle is to basket pouring molten steel, can not slag; Adopt slag blocking wall, slag weir, baking of tundish temperature 1280 DEG C, baking time 4.5 hours.
B. tundish uses carbon-free magnesium-aluminium dry materials, carbon-free aluminium matter filling pipe end and stopper, uses carbon-free high alkalinity insulating covering agent;
C. crystallizer uses carbon-free high-viscosity covering slag, the whole immersion type mouth of a river.
D. pulling speed of continuous casting is 4.4m/min; Straightening temperature 860 DEG C.
E. two coldly the strong type of cooling is but adopted.
By the ultra low-carbon steel the finished product Chemical Composition of above-mentioned explained hereafter in table 2
Embodiment 5
(1) desulfurizing iron: skim after hot metal ladle winding-up granular magnesium, enter stove molten iron S≤0.003%;
(2) converter smelting:
A. molten iron temperature 1350 DEG C, S=0.003%, P=0.120%;
B. converting process is major objective with dephosphorization, and require full range slag, furnace temperature steadily rises;
C. finishing slag basicity is 3.91, molten steel composition (mass percent) C:0.04%, S:0.005%, P:0.007%; Terminal temperature: 1710 DEG C, terminal oxygen position: 730ppm;
D. tapping, use is used in conjunction, clean special RH refining ladle;
E. slag stopping pushing off the slag is adopted, slag thickness≤50mm; Finishing slag FeO mass percent 24%;
F. tap 6 minutes time, steel stream rounding.
G. high carbon ferromanganese add-on is 1.1Kg/ ton steel; Lime adding amount: 1.6 kgs/tonne of steel; Start to feed in raw material during tapping molten steel 1/4, add high carbon ferromanganese, lime successively; Add before tapping 3/4, tapping process closes steel ladle bottom argon blowing.
(3) RH vacuum-treat:
A. ladle enters the station, and thermometric determines oxygen, temperature 1645 DEG C, oxygen position: 650ppm; Sampling analysis composition;
B. open vacuum pump, be circulated to 26 minutes, vacuum tightness reaches 130Pa, thermometric sampling analysis composition;
C. after in steel, C, N, Ti, temperature meet the demands, every stove adds calcic ferrosilicon 1.0 kgs/tonne of steel, and circulate thermometric sampling departures in 2 minutes, and out-station temperature is: 1605 DEG C;
RH sets off chemical composition in table 1.
(4) FTSC sheet blank continuous casting:
A. molten steel temperature in tundish 1574 DEG C, ladle adopts long nozzle to add argon gas-sealed protection molten steel to tundish, and long nozzle place molten steel can not be exposed; When ladle is to basket pouring molten steel, can not slag; Adopt slag blocking wall, slag weir, baking of tundish temperature 1265 DEG C, baking time 4.3 hours.
B. tundish uses carbon-free magnesium-aluminium dry materials, carbon-free aluminium matter filling pipe end and stopper, uses carbon-free high alkalinity insulating covering agent;
C. crystallizer uses carbon-free high-viscosity covering slag, the whole immersion type mouth of a river.
D. pulling speed of continuous casting is 4.2m/min; Straightening temperature 920 DEG C.
E. two coldly the strong type of cooling is but adopted.
By the ultra low-carbon steel the finished product Chemical Composition of above-mentioned explained hereafter in table 2
Embodiment 6
(1) desulfurizing iron: skim after hot metal ladle winding-up granular magnesium, enter stove molten iron S≤0.003%;
(2) converter smelting:
A. molten iron temperature 1350 DEG C, S=0.003%, P=0.120%;
B. converting process is major objective with dephosphorization, and require full range slag, furnace temperature steadily rises;
C. finishing slag basicity is 3.85, molten steel composition (mass percent) C:0.04%, S:0.004%, P:0.005%; Terminal temperature: 1700 DEG C, terminal oxygen position: 750ppm;
D. tapping, use is used in conjunction, clean special RH refining ladle;
E. slag stopping pushing off the slag is adopted, slag thickness≤50mm; Finishing slag FeO mass percent 25%;
F. tap 5 minutes time, steel stream rounding.
G. high carbon ferromanganese add-on is 1.03Kg/ ton steel; Lime adding amount: 1.9 kgs/tonne of steel; Start to feed in raw material during tapping molten steel 1/4, add high carbon ferromanganese, lime successively; Add before tapping 3/4, tapping process closes steel ladle bottom argon blowing.
(3) RH vacuum-treat:
A. ladle enters the station, and thermometric determines oxygen, temperature 1643 DEG C, oxygen position: 670ppm; Sampling analysis composition;
B. open vacuum pump, be circulated to 26 minutes, vacuum tightness reaches 130Pa, thermometric sampling analysis composition;
C. after in steel, C, N, Ti, temperature meet the demands, every stove adds calcic ferrosilicon 2.7 kgs/tonne of steel, and circulate thermometric sampling departures in 2 minutes, and out-station temperature is: 1602 DEG C;
RH sets off chemical composition in table 1.
(4) FTSC sheet blank continuous casting:
A. molten steel temperature in tundish 1572 DEG C, ladle adopts long nozzle to add argon gas-sealed protection molten steel to tundish, and long nozzle place molten steel can not be exposed; When ladle is to basket pouring molten steel, can not slag; Adopt slag blocking wall, slag weir, baking of tundish temperature 1275 DEG C, baking time 4.4 hours.
B. tundish uses carbon-free magnesium-aluminium dry materials, carbon-free aluminium matter filling pipe end and stopper, uses carbon-free high alkalinity insulating covering agent;
C. crystallizer uses carbon-free high-viscosity covering slag, the whole immersion type mouth of a river.
D. pulling speed of continuous casting is 4.1m/min; Straightening temperature 950 DEG C.
E. two coldly the strong type of cooling is but adopted.
By the ultra low-carbon steel the finished product Chemical Composition of above-mentioned explained hereafter in table 2.
Table 1RH departures chemical composition (%)
Table 2 ultra low-carbon steel product Chemical Composition (%)
Various embodiments of the present invention are produced continuously cast bloom macroscopic examination and are not occurred the defects such as centre burst, center porosity and center segregation, casting billet surface and subcutaneously do not have dreg defect; Hot-rolled sheet coil excellent surface quality.
Claims (7)
1. produce a method for ultra low-carbon steel based on FTSC sheet blank continuous casting, it is characterized in that it comprises the steps:
(1) desulfurizing iron: skim after hot metal ladle winding-up granular magnesium, enter stove molten iron S≤0.003%;
(2) converter smelting: finishing slag basicity is 3.5-4.0; Molten steel control composition mass percent is: C:0.03-0.06%, S≤0.010%, P≤0.012%; Terminal temperature
1680-1720dEG C, terminal oxygen position: 600-800ppm, finishing slag FeO mass percent 22%-28%, tapping time 5-6 minute;
(3) RH vacuum-treat: inlet temperature 1630-1650 DEG C, enter the station oxygen position: 500-700ppm, decarburization, component controlling; Out-station temperature: 1590-1610 DEG C; Every stove adds calcic ferrosilicon 1.0-3.0 kg/tonne of steel;
Departures chemical composition mass percent is: C≤0.0096%, Mn0.06-0.35%, S≤0.018%, P≤0.018%, Si:0.12-0.26%, Als0.025-0.060%, Ti≤0.09%;
(4) FTSC sheet blank continuous casting: molten steel temperature in tundish 1562-1576 DEG C; Tundish adopts slag blocking wall, slag weir, baking of tundish temperature 1250-1280 DEG C, baking time 4-4.5 hour;
The mass percent of described ultra low-carbon steel composition is: C≤0.010%; Mn0.06-0.35%; Si0.12-0.28%; P≤0.020%; S≤0.020%; Ti≤0.09%; N≤0.0050%; All the other are iron and inevitable impurity.
2. a kind of method of producing ultra low-carbon steel based on FTSC sheet blank continuous casting according to claim 1, it is characterized in that described converter smelting, RH vacuum-treat and FTSC sheet blank continuous casting, middle Baogang water oxygen, Control of Nitrogen Content are [O]≤40ppm, [N]≤40ppm.
3. a kind of method of producing ultra low-carbon steel based on FTSC sheet blank continuous casting according to claim 1 and 2, is characterized in that adopting slag stopping pushing off the slag, slag thickness≤50mm in described step (2); High carbon ferromanganese joins manganese; High carbon ferromanganese add-on is 1.0-1.1Kg/ ton steel; Lime adding amount: 1.5-2.0 kg/tonne steel; Start to feed in raw material during tapping molten steel 1/4, add high carbon ferromanganese, lime successively; Add before tapping 3/4, tapping process closes steel ladle bottom argon blowing.
4. a kind of method of producing ultra low-carbon steel based on FTSC sheet blank continuous casting according to claim 1 and 2, is characterized in that in described step (4), ladle adopts long nozzle to add argon gas-sealed protection molten steel to tundish.
5. a kind of method of producing ultra low-carbon steel based on FTSC sheet blank continuous casting according to claim 4, is characterized in that, in described step (4), tundish uses carbon-free magnesium-aluminium dry materials, carbon-free aluminium matter stopper and the whole immersion type mouth of a river.
6. a kind of method of producing ultra low-carbon steel based on FTSC sheet blank continuous casting according to claim 5, is characterized in that in described step (4), cooling twice adopts the strong type of cooling, straightening temperature 850-950 DEG C.
7. a kind of method of producing ultra low-carbon steel based on FTSC sheet blank continuous casting according to claim 6, is characterized in that the pulling rate of described step (4) continuous casting of middle-thin slabs is 4.0-4.5m/min.
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| CN106148803A (en) * | 2016-08-30 | 2016-11-23 | 唐山钢铁集团有限责任公司 | A kind of production method of deep-draw battery case steel |
| CN107245656A (en) * | 2017-06-16 | 2017-10-13 | 武汉钢铁有限公司 | The fin steel and its CSP production technologies of a kind of excellent surface quality |
| CN108018403A (en) * | 2017-12-19 | 2018-05-11 | 中国地质大学（武汉） | A kind of method of thin-slab caster production automobile using extra-deep drawing steel |
| CN114015930A (en) * | 2021-09-22 | 2022-02-08 | 武安市裕华钢铁有限公司 | High-efficiency Q235B micro-titanizing steel grade production process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106148803A (en) * | 2016-08-30 | 2016-11-23 | 唐山钢铁集团有限责任公司 | A kind of production method of deep-draw battery case steel |
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| CN114015930A (en) * | 2021-09-22 | 2022-02-08 | 武安市裕华钢铁有限公司 | High-efficiency Q235B micro-titanizing steel grade production process |
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| CN105463316B (en) | 2017-04-12 |
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