CN1851004A - Low-silicon low-carbon aluminium full killed steel refining method - Google Patents
Low-silicon low-carbon aluminium full killed steel refining method Download PDFInfo
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- CN1851004A CN1851004A CN 200510031484 CN200510031484A CN1851004A CN 1851004 A CN1851004 A CN 1851004A CN 200510031484 CN200510031484 CN 200510031484 CN 200510031484 A CN200510031484 A CN 200510031484A CN 1851004 A CN1851004 A CN 1851004A
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Abstract
The invention discloses the method of purifying the claming steel with the low content of the silicon, the carbon and the aluminum, the molten iron without the pretreatment is make to the low silicon and the low carbon smelt in the peak and bottom duplicating blowing stove, then the steel is gained when the component of the terminal molten steel reaches to the needing and is purified using the LF stove. When the purify begins, the four buck dregs CaO-AL203-Mg0-SiO; 1-15kg/t is added in the steel and the electricity is give, the argon is added in the all process, the intension of supplying the argon is 1.5-5.0NL/t steel min, the four buck alkalinity in the dregs is 1.8-3.2, the(MgO+FeO) in the dregs is less than 0.2-1.0%. The 0.5-5.0Kg/t steel and aluminum reverting silicon dioxide feedbacking reagent AL3O3, NaALO2 or Ca (ALO2) is added during the purifing process, the refining time is 20-25min, the 1.0-5.0Kg/t steel and aluminum reverting silicon dioxide feedbacking reagent CaO OR CaCO3 is added before the iron and the calcium are fed, the molten steel is under the treatment of microalloy after the power cut, the high alkalinity and the low silicon mantling reagent without the carbon is put on the surface of the big bale molten steel, it is delivered to the joining casting and the joining rolling mill. The low silicon and the low carbon and the low aluminum calming steel used for the pressing can be produced without the vacuum treatment using the purifying method.
Description
Technical field
The present invention relates to a kind of method of refining of killed steel, relate in particular to a kind of method of refining of low-silicon low-carbon aluminium full killed steel, belong to the C21C7/072 class.
Background technology
Low-silicon low-carbon aluminium full killed steel is the main steel grade of punching press with cold-rolled steel.At present, the method for refining of this steel grade has: 1. adopt LF+VD technology, i.e. converter or electric furnace molten steel enter the LF stove through deoxidation just and carry out refining desulfuration, remove to be mingled with and to finely tune composition, enter VD then and carry out vacuum decarburization and [N] processing; 2. adopt LF stove+RH technology, molten steel enters RH and carries out vacuum decarburization and [N] processing after LF handles.These two kinds of technical maturities are present low-silicon low-carbon aluminium full killed steel purified predominant methods, but these two kinds of methods all need bigger investment, and Production Flow Chart is long, and production cost is higher, is a kind of not very good method of refining.
Summary of the invention
The object of the present invention is to provide the method for refining that is exclusively used in low-silicon low-carbon aluminium full killed steel of a kind of technology uniqueness, saving investment, shortened process.
For achieving the above object, the technical solution used in the present invention is: to smelting without the pretreated blast-melted low-silicon low-carbon that carries out on the top bottom blowing oxygen coverter, use tapping shelves slag operation technology, add carbon-free quaternary slag and carbon dioxide reduction reaction inhibitor when on the LF stove, molten steel being carried out refining, send CSP continuous caster continuous casting to become thin slab with little after closing full processing through the composition fine setting again.
Adopt the method for refining of a kind of low-silicon low-carbon aluminium full killed steel that as above technical scheme provides compared with prior art to it is characterized in that:
1. refining operation is simple, method is reliable, the carbon-free quaternary refining slag and the reaction suppressor that in the LF refining furnace, add, easy to operate, production cost is low, need not just can directly to send into CSP continuous caster continuous casting through the purified molten steel and become thin slab, and satisfy the related request of punching press with steel through vacuum-treat.
2. can saving equipment infusion of financial resources 10～25%.
Embodiment
Below in conjunction with embodiment the specific embodiment of the present invention is described in further detail.
The method of refining of described a kind of low-silicon low-carbon aluminium full killed steel is to operate in the LF refining furnace.
To be blended into steel scrap and smelt, double-slag operation without pretreated blast-melted 90t or the 100t top bottom blowing oxygen coverter poured into.Reach requirement at the endpoint molten steel composition, as carbon oxygen concn long-pending [C] [O]≤0.01～0.03%, [Mn]=0.05～0.25%, [Si]≤0.01% or be that vestige, [P]≤0.008%, [S]≤0.04% o'clock are tapped.
Ladle is put into LF stove refining station, slit between good seal ladle upper edge and the clad, use the high current density electrode, the voltage that is added on the electrode is 240～290 volts of interchanges, current density is 35.8～37.1 kilo-amperes, promptly adopt low voltage, high current density powered operation, reduce molten steel and in refining process, increase [N].
Molten steel when refining begins in the LF refining furnace adds quaternary refining slag system CaO-MgO-Al
2O
3-SiO
21.0～1.5kg/t
Steel, described quaternary refining slag system is by CaO, Al
2O
3, MgO, SiO
2Form, CaO accounts for gross weight 20～60%, Al
2O
3Account for gross weight 5～40%, MgO accounts for gross weight 15～40%, SiO
2Account for gross weight 1～25%.
Molten steel when refining begins in the LF refining furnace adds refining quaternary slag system (CaO-Al
2O
3-MgO-SiO
2) 1.0～15.0kg/t
Steel, using the high current density electrode, voltage is for exchanging 240～290 volts, and current density is 35.8～37.1 kilo-amperes.Omnidistance Argon is handled, and is 1.5～5.0NL/t for argon gas intensity
Steel.min, when liquid steel refining begins, use earlier big argon flow amount, stir 1～5min as 5.0NL/min, supplying argon intensity during feeding temperature-raising is 2.0～4.0NL/t
Steel.min, be 3.0～5.0m during the scorification desulfurization for argon gas intensity
3/ t
SteelSupplying argon gas intensity when .min, feeding iron calcium silk is 3.5～5.0NL/t
Steel.min, the preceding 6～15min of departures is 1.5～3.0NL/t for argon gas intensity
Steel.min; Control generates quaternary basicity R=(CaO+MgO)/(Al in the slag
2O
3+ SiO
2) between 1.6～3.2, (MnO+FeO)≤0.2～1.0% in the slag adds 0.5～5.0kg/t in molten steel in the refining process
SteelAluminium reducing silicon dioxde reaction inhibitor Al
2O
3, NaAlO
2Or Ca (AlO
2)
2In a kind of.Refining time was controlled at 25～50 minutes, feeds the preceding 5～10min of iron calcium and add 1.0～5.0kg/t in molten steel
SteelThe calcium reduction silicon dioxde reaction suppresses CaO or CaCO
3In a kind of, or several combination, its combination is than being 1: 1 or 1: 2.After stopping to send electricity, molten steel is carried out microalloying handle, as feeding iron calcium silk 1.0～5.0kg/t
Steel, feed boron or titanium silk 5～40m/t
Steel, and on big Baogang water surface, add the low silicon insulating covering agent of carbon-free high basicity.
After refining finishes, sample examination, and carry out trimming according to result of laboratory test, the molten steel composition is during departures: [C]≤0.04%, [Si]≤0.025%, [Mn]≤0.2%, [P]≤0.012%, [S]≤0.008%, [Ca]=0.002～0.004%, [N]≤45 * 10-6, Als=(250-400) * 10
-6, Ca/Als=0.10-0.15%.Thermometric is controlled at 1580～1610 ℃ according to CSP continuous casting situation liquid steel temperature.
Embodiment 1
With the undressed blast-melted 100t top bottom blowing oxygen coverter of pouring into, be blended into steel scrap and smelt, double-slag operation.When endpoint molten steel composition [C]≤0.01-0.03%, [Si] are vestige, [P]≤0.008%, [S]≤0.04%, [Mn]≤0.18% o'clock tapping, ladle is put into refining station, space between good seal ladle upper edge and the clad, adopt the high current density electrode, the voltage that is added on the electrode is 240 volts of interchanges, and current density is 37.1 kilo-amperes.When beginning, refining in the LF refining furnace, adds CaO20%-Al
2O
340%-MgO15%-SiO
225% quaternary refining slag system 15kg/t
Steel, omnidistance Argon is handled, for argon gas intensity 5.0NL/t
Steel.min, stir 3min with big argon flow amount such as 5.0NL/min earlier, supplying argon gas intensity during feeding temperature-raising is 3.0NL/t
Steel.min, be 5.0NL/t during the scorification desulfurization for argon gas intensity
SteelSupplying argon gas intensity when .min, feeding iron calcium silk is 4.5NL/t
Steel.min, 10min before the departures is 3.0NL/t for argon gas intensity
Steel.min, quaternary basicity R is 3.2 in the control generation slag, (MgO+FeO)=1.0% in the slag; In refining process, in molten steel, add 0.5kg/t
SteelAluminium reducing silicon dioxde reaction inhibitor Al
2O
3, refining time is 35min, after refining finishes, the LF refining furnace is released refining station, departures are fed in molten steel before the iron calcium silk and to be added 3kg/t in the clockwise molten steel in 10 minutes
SteelCalcium reduction silicon dioxde reaction inhibitor C aO feeds iron calcium silk 3.5kg/t to molten steel
Steel, feed boron filament 25m/min, add the low silicon insulating covering agent of carbon-free high basicity at molten steel surface, molten steel after refining is handled and the composition fine setting through microalloying, send CSP continuous casting and continuous rolling mill.
Embodiment 2
With the undressed blast-melted 100t top bottom blowing oxygen coverter of pouring into, be blended into steel scrap and smelt, double-slag operation.When endpoint molten steel composition [C]≤0.01-0.03%, [Si]≤0.01%, [P]≤0.008%, [S]≤0.04%, [Mn]≤0.18% o'clock tapping, ladle is put into refining station, space between good seal ladle upper edge and the clad, adopt the high current density electrode, the voltage that is added on the electrode is 290 volts of interchanges, and current density is 35.8 kilo-amperes.When beginning, refining in the LF refining furnace, adds CaO35%-Al
2O
324%-MgO40%-SiO
21% quaternary refining slag system 15kg/t
Steel, omnidistance Argon is handled, for argon gas intensity 5.0NL/t
Steel.min, stir 5min with big argon flow amount such as 5.0NL/min earlier, supplying argon gas intensity during feeding temperature-raising is 2.0NL/t
Steel.min, be 3.0NL/t during the scorification desulfurization for argon gas intensity
SteelSupplying argon gas intensity when .min, feeding iron calcium silk is 5.0NL/t
Steel.min, 15min before the departures is 2.5NL/t for argon gas intensity
Steel.min, quaternary basicity R is 2.5 in the control generation slag, (MgO+FeO)=0.6% in the slag; In refining process, in molten steel, add 5.0kg/t
SteelAluminium reducing silicon dioxde reaction inhibitor NaAlO
2, refining time is 25min, after refining finishes, the LF refining furnace is released refining station, departures are fed in molten steel before the iron calcium silk and to be added 5.0kg/t in the clockwise molten steel in 7 minutes
SteelCalcium reduction silicon dioxde reaction inhibitor C aO feeds iron calcium silk 5.0kg/t to molten steel
Steel, feed boron filament 5m/min, on molten steel surface, add the low silicon insulating covering agent of carbon-free high basicity, molten steel after refining is handled and the composition fine setting through microalloying, send CSP continuous casting and continuous rolling mill.
Embodiment 3
With the undressed blast-melted 100t top bottom blowing oxygen coverter of pouring into, be blended into steel scrap and smelt, double-slag operation.When endpoint molten steel composition [C]≤0.01-0.03%, [Si]≤0.01%, [P]≤0.008%, [S]≤0.04%, [Mn]≤0.18% o'clock tapping, ladle is put into refining station, space between good seal ladle upper edge and the clad, adopt the high current density electrode, the voltage that is added on the electrode is 265 volts of interchanges, and current density is 36.5 kilo-amperes.When beginning, refining in the LF refining furnace, adds CaO60%-Al
2O
35%-MgO25%-SiO
210% quaternary refining slag system 1.0kg/t
Steel, omnidistance Argon is handled, for argon gas intensity 1.5NL/t
Steel.min, be that 5.0NL/min stirs 1min with big argon flow amount earlier, supplying argon gas intensity during feeding temperature-raising is 4.0NL/t
Steel.min, be 4.0NL/t during the scorification desulfurization for argon gas intensity
SteelSupplying argon gas intensity when .min, feeding iron calcium silk is 3.5NL/t
Steel.min, 6min before the departures is 1.5NL/t for argon gas intensity
Steel.min, quaternary basicity R is 1.6 in the control generation slag, (MgO+FeO)=0.2% in the slag; In refining process, in molten steel, add 3.5kg/t
SteelAluminium reducing silicon dioxde reaction inhibitor C a (AlO
2)
2, refining time is 50min, after refining finishes, the LF refining furnace is released refining station, departures are fed in molten steel before the iron calcium silk and to be added 1.0kg/t in the clockwise molten steel in 5 minutes
SteelCalcium reduction silicon dioxde reaction inhibitor C aCO
3, feed iron calcium silk 1.0kg/t to molten steel
Steel, feed titanium silk 40m/min, add the low silicon insulating covering agent of carbon-free high basicity at molten steel surface, molten steel after refining is handled and the composition fine setting through microalloying, send CSP continuous casting and continuous rolling mill.
Claims (2)
1, a kind of method of refining of low-silicon low-carbon aluminium full killed steel will be blended into steel scrap and carry out the low-silicon low-carbon smelting without the pretreated blast-melted top bottom blowing oxygen coverter of pouring into, taps when the endpoint molten steel composition reaches requirement; Ladle is put into LF stove refining station, and the slit between good seal ladle upper edge and the clad is characterized in that: the molten steel when refining begins in the LF stove adds quaternary refining slag system 1.0～15.0kg/t steel; Use the high current density electrode, voltage is 240～290 volts, and electric current is 35.8～37.1 kilo-amperes; Omnidistance Argon is handled, and supplies argon gas intensity at 1.5～5NL/t steel .min; Stir 1～5min with big argon flow amount earlier, supplying argon gas intensity during feeding temperature-raising is 2.0～4.0NL/t steel .min, supplying argon gas intensity during the scorification desulfurization is 3.0～5.0NL/t steel .min, supplying argon gas intensity when feeding iron calcium silk is 3.5～5.0NL/t steel .min, preceding 6～the 15min that sets off is 1.5～3.0m for argon gas intensity
3/ t steel .min; Control generates the quaternary basicity R of slag between 1.6～3.2; (MnO+FeO)≤0.2～1.0% in the slag; In refining process, in molten steel, add 0.5～5.0kg/t steel aluminium reducing silicon dioxde reaction inhibitor Al
2O
3, NaAlO
2Or Ca (AlO
2)
2, refining time is controlled at 25～50min, feeds the preceding 5～10min of iron calcium and add 1.0～5.0kg/t steel calcium reduction silicon dioxde reaction inhibitor C aO, CaCO in molten steel
3In a kind of, molten steel is carried out microalloying handles, feed iron calcium silk 1.0～5.0kg/t steel, feed boron or titanium silk 5～40m/min, on big Baogang water surface, adding the low silicon insulating covering agent of carbon-free high basicity.
2, the method for refining of a kind of low-silicon low-carbon aluminium full killed steel according to claim 1 is characterized in that: the quaternary refining slag system is by CaO, Al
2O
3, MgO, SiO
2Form, CaO accounts for 20～60% of gross weight, Al
2O
3Account for 5～40% of gross weight, MgO accounts for 15～40% of gross weight, SiO
2Account for 1～25% of gross weight.
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| CN115786640A (en) * | 2022-10-28 | 2023-03-14 | 青岛特殊钢铁有限公司 | Refining method applied to aluminum-containing steel production |
| CN115786640B (en) * | 2022-10-28 | 2024-07-26 | 青岛特殊钢铁有限公司 | Refining method applied to aluminum-containing steel production |
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