CN100999770A - Production tech. of low carbon low silicon aluminium killed steel - Google Patents
Production tech. of low carbon low silicon aluminium killed steel Download PDFInfo
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Abstract
The present invention relates to metallurgical technology, and is especially one low carbon and low silicon aluminum-killed steel producing process with converter and continuous small square billet casting machine. The technological scheme is that the low carbon and low silicon aluminum-killed steel producing process includes making steel with molten iron in a converter pre-slagging during tapping, deeply deoxidizing, slag forming fining, soft blowing fining and calcium treatment in an argon blowing station, and final protected casting in a continuous small square billet casting machine. The present invention has lowered production cost.
Description
Technical field
The present invention relates to the metallurgical technology field, refer to a kind of converter that is adapted to---the production technique of the low carbon low silicon aluminium killed steel of continuous small-billet casting factory particularly.
Background technology
Low carbon low silicon aluminium killed steel (as SWRM8, SWRM10 etc.) adopts aluminium deoxidation technology, and its deoxidation products aluminium sesquioxide fusing point is high, and is as easy as rolling off a log attached to rough surface, and progressively assembles and grow up.When these steel grades during in the billet caster top casting, be present in aluminium sesquioxide in the molten steel with the form of inclusion, be easy in the rough middle water containing opening of inwall position gathering (calling the aluminium sesquioxide dross in the following text), and the middle water containing opening internal diameter of billet caster is less, its aggregation will make that thereby mouth of a river place pouring channel reduces to produce the phenomenon that casting has some setbacks, and might stop up the mouth of a river fully even and causes producing the interruption accident.Solve low carbon low silicon aluminium killed steel casting cycle aluminium sesquioxide dross problem, must be by the slag making refining, adsorb and reduce aluminium sesquioxide inclusion in the steel, and handle by calcium and remaining aluminium sesquioxide inclusion to be transformed into can not generate other low-melting complex inclusion that aggregation stops up the mouth of a river.And ladle refining furnace has the function of auxiliaryization of heating slag slag making, it is having great advantage aspect the slag making refining function, thereby continuous small-billet casting factory all adopts ladle refining furnace to carry out the slag making refining treatment, to solve its aluminium sesquioxide dross problem when producing low carbon low silicon aluminium killed steel.But, so but increased the cost that continuous small-billet casting factory produces low carbon low silicon aluminium killed steel.And become under the situation of critical process that present many steel mills produce variety steel at ladle refining furnace, this has also limited the space of more pairs of high product of continuous small-billet casting factory exploitation.If operation was finished before the refining function that slag making and calcium processing can be waited other former cause ladle refining furnace implement moved forward to, can significantly reduce production costs, effectively discharge the ladle refining furnace production capacity, promote the more two high product of steel mill's exploitation.But, because of heating function is difficult to reach, correspondingly changes slag, slag making function and also be difficult to reach, thereby, this type of technology still do not had at present.
Summary of the invention
The objective of the invention is to provide a kind of and can significantly reduce cost, handle the production technique of the low carbon low silicon aluminium killed steel that just can solve aluminium sesquioxide dross problem without ladle refining furnace at the problems referred to above.
Technical scheme of the present invention is: be raw material with the molten iron, bessemerize, converter tapping, the refining of Argon station, molten steel sent into the casting of billet caster whole process protection at last and promptly obtained low carbon low silicon aluminium killed steel, wherein, in the converter tapping process, add the compound slag making materials that includes pro-molten refining slag and carry out pre-slag making in the molten steel after deoxidation alloying is handled, the control slag basicity reaches 6.0～8.0;
The station refining of said Argon is included in carries out following steps in the Argon station:
(1) degree of depth deoxidation: carry out deoxidation with the method for the feeding aluminum steel molten steel after to converter tapping, free oxygen level is between 2～5ppm in the control molten steel when deoxidation finishes period, and sour molten aluminium is between 400～600ppm;
(2) slag making refining: add fluorite, aluminum shot and calcium carbide and carry out the residue adjustment operation, carry out strong BOTTOM ARGON BLOWING simultaneously and stir, the ferric oxide when slag making finishes in the control slag and the total content of manganese oxide are no more than 2%, aluminium sesquioxide content is between 20～30%;
(3) soft blow refining: adopt weak BOTTOM ARGON BLOWING to stir and carry out the soft blow operation;
(4) calcium is handled: add the silico-calcium cored-wire by wire feeder, remaining total calcium reaches 30～40ppm in the control molten steel after the calcium processing finishes.
In the above-mentioned converter tapping process, the compound slag making materials that adds is made up of 4～6kg/t lime, 1.8～2.2kg/t pro-molten refining slag and 0.5～0.8kg/t fluorite, wherein, pro-molten refining slag comprises 50～55% calcium oxide, 5～10% silicon-dioxide, 30～35% aluminium sesquioxides, and surplus is an auxiliary material.
In the above-mentioned step of carrying out (1) at the Argon station, the aluminum steel consumption is 1.0～1.7kg/t, be operating as: aluminum steel consumption 1.7kg/t is a radix during with molten steel carbon containing 0.03%, during the every increase by 0.01% of carbon content, the aluminum steel consumption reduces 0.1kg/t, minimum amount is 1.0kg/t, and said deaeration time is 2～3min.
In the above-mentioned step of carrying out at the Argon station (2), the residue adjustment operation comprises: add 0.3～0.8kg/t fluorite, 0.3～0.5kg/t aluminum shot and 0.1～0.2kg/t calcium carbide slag is carried out deoxidation; Said strong BOTTOM ARGON BLOWING stirs and is: employing intensity is 3.0～4.0Nm
3The BOTTOM ARGON BLOWING of/mint stirs molten steel; The said slag making time is 4～6min.
In the above-mentioned step of carrying out at the Argon station (3), weak BOTTOM ARGON BLOWING stirs and is: employing intensity is 0.5～1.0Nm
3The BOTTOM ARGON BLOWING of/mint stirs molten steel, and the said soft blow time is 4～6min.
In the above-mentioned step of carrying out at the Argon station (4), described silico-calcium cored-wire adding speed is 0.15kg/s, and consumption is 1.2～1.6kg/t.
In the above-mentioned converter tapping process, because the converter tapping temperature can not surpass the upper limit requirement of maintaining converter, the Argon station lacks the heat temperature raising means again, make Argon station purified total time should be no more than 20min, for guaranteeing in limited Argon station refining time, to reach the slag making effect, thereby the pro-molten refining slag of employing low melting point (being lower than 1460 ℃) is as the part of slag making materials, melt institute's heat requirement fully to reduce slag making materials, make full use of the high temperature and the strong mixing effect of tapping process molten steel simultaneously, most of slag making materials can be melted at tapping process, thereby shorten slag making time and Argon station purified total time.
In the above-mentioned step of carrying out (1), adopt the deoxidation of degree of depth deoxidation mode, help reducing fast the oxygen level in molten steel and the slag, alleviate the residue adjustment deoxidation pressure in the aftermentioned step (2) at the Argon station.
In above-mentioned step of carrying out (2) at the Argon station, because when oxygen level is high in the slag, slag will make molten steel produce secondary oxidation in strong BOTTOM ARGON BLOWING whipping process, thereby produce new aluminium sesquioxide, and suitable slag composition (comprising basicity and aluminium sesquioxide content) is to guarantee that slag possesses the prerequisite of active adsorption aluminium sesquioxide inclusion ability, thereby adopt aluminum shot and calcium carbide to carry out the deoxidation residue adjustment, adding fluorite then is in order to improve the flowability of slag, promote the raising of slag deoxidation effect, and the purpose of carrying out strong BOTTOM ARGON BLOWING stirring, then be to impel slag fully to contact, improve the effect that slag making refining absorption aluminium sesquioxide is mingled with.
In above-mentioned step of carrying out (3) at the Argon station, owing in the molten steel a small amount of macrobead aluminium sesquioxide is arranged still after the slag making refining, therefore, carry out the soft blow operation by weak BOTTOM ARGON BLOWING stirring, it is further floated remove.
In above-mentioned step of carrying out (4) at the Argon station, can make the small-particle aluminium sesquioxide of removing that finally is difficult to float be transformed into other low-melting complex inclusion by the calcium processing, this complex inclusion can not form aggregation at billet caster middle water containing opening position, thereby finally solves the aluminium sesquioxide dross problem at billet caster middle water containing opening position.
The present invention is by the pre-slag making of tapping process and the degree of depth deoxidation in the Argon station, the slag making refining, the soft blow refining, operations such as calcium processing, finished originally and can only have heat temperature raising and add that the ladle refining furnace of thermalization slag function implements, other refining function except that heat temperature raising, solved the aluminium sesquioxide dross problem at low carbon low silicon aluminium killed steel water middle water containing opening position when follow-up billet caster is cast, it even waters the stove number and can reach more than 12 stoves, casting cycle does not have the phenomenon that dross and casting have some setbacks, owing to do not need through ladle refining furnace, the production cost of low carbon low silicon aluminium killed steel significantly reduces, about 50 yuan of/ton steel reduce production costs, discharged the production capacity of ladle refining furnace effectively, for the more two high product of steel mill's exploitation lay the first stone.
Embodiment
The invention will be further described below in conjunction with embodiment, and wherein ,/t represents molten steel per ton.
Embodiment: the raw material molten iron sent into bessemerize, in the converter tapping process after bessemerizing end, in the molten steel after deoxidation alloying is handled, add by 4～6kg/t lime, 1.8～2.2kg/t pro-molten refining slag and 0.5～0.8kg/t fluorite carry out pre-slag making, wherein, pro-molten refining slag can have been bought on market, its fusing point is lower than 1460 ℃, comprise 50～55% calcium oxide, 5～10% silicon-dioxide, 30～35% aluminium sesquioxides, surplus is an auxiliary material, and add the floating plug pushing off the slag before tapping finishes, the control slag basicity reaches 6.0～8.0 after pre-slag making and pushing off the slag;
Then molten steel is sent into the refining of Argon station, is included in and carries out following steps in the Argon station:
(1) degree of depth deoxidation: carry out deoxidation with the method for the feeding aluminum steel molten steel after to converter tapping, working method is: aluminum steel consumption 1.7kg/t is a radix during with molten steel carbon containing 0.03%, during the every increase by 0.01% of carbon content, the aluminum steel consumption reduces 0.1kg/t, minimum amount is 1.0kg/t, deaeration time is 2～3min, and free oxygen level is between 2～5ppm in the control molten steel when deoxidation finishes period, and sour molten aluminium is between 400～600ppm;
(2) slag making refining: adopt 0.3～0.8kg/t fluorite, 0.3～0.5kg/t aluminum shot and 0.1～0.2kg/t calcium carbide that slag is carried out the deoxidation residue adjustment, adopting intensity simultaneously is 3.0～4.0Nm
3The strong BOTTOM ARGON BLOWING of/mint stirs molten steel, and slag is fully contacted, and improves the effect that slag making refining absorption aluminium sesquioxide is mingled with, and the slag making time is 4～6min;
(3) soft blow refining: with intensity is 0.5～1.0Nm
3The weak BOTTOM ARGON BLOWING of/mint stirs molten steel and carries out the soft blow operation, and impelling the aluminium sesquioxide that residues in the steel removal of further floating, soft blow period is 4～6min;
(4) calcium is handled: by the speed adding silico-calcium cored-wire of wire feeder with 0.15kg/s, silico-calcium cored-wire consumption is 1.2～1.6kg/t, and remaining total calcium reaches 30～40ppm in the molten steel of control calcium processing end back.
After the calcium processing finishes; molten steel is delivered to billet caster carry out the whole process protection casting; it even waters the stove number and can reach more than 12 stoves; casting cycle can not produce aluminium sesquioxide dross phenomenon; casting finishes and promptly obtains low carbon low silicon aluminium killed steel; whole production technology need not passed through ladle refining furnace, about 50 yuan of/ton steel that reduce production costs, and the low carbon low silicon aluminium killed steel of producing can reach the requirement of relevant every index.
Claims (6)
1, a kind of production technique of low carbon low silicon aluminium killed steel, it is characterized in that, with the molten iron is raw material, bessemerize, converter tapping, the refining of Argon station, molten steel sent into the casting of billet caster whole process protection at last and promptly obtained low carbon low silicon aluminium killed steel, wherein, in the said converter tapping process, add the compound slag making materials that includes pro-molten refining slag and carry out pre-slag making in the molten steel after deoxidation alloying is handled, the control slag basicity reaches 6.0～8.0; The station refining of said Argon is included in carries out following steps in the Argon station:
(1) degree of depth deoxidation: carry out deoxidation with the method for the feeding aluminum steel molten steel after to converter tapping, free oxygen level is between 2～5ppm in the control molten steel when deoxidation finishes period, and sour molten aluminium is between 400～600ppm;
(2) slag making refining: add fluorite, aluminum shot and calcium carbide and carry out the residue adjustment operation, carry out strong BOTTOM ARGON BLOWING simultaneously and stir, the ferric oxide when slag making finishes in the control slag and the total content of manganese oxide are no more than 2%, aluminium sesquioxide content is between 20～30%;
(3) soft blow refining: adopt weak BOTTOM ARGON BLOWING to stir and carry out the soft blow operation;
(4) calcium is handled: add the silico-calcium cored-wire by wire feeder, remaining total calcium reaches 30～40ppm in the control molten steel after the calcium processing finishes.
2, the production technique of low carbon low silicon aluminium killed steel as claimed in claim 1, it is characterized in that, in the said converter tapping process, the compound slag making materials that adds is made up of 4～6kg/t lime, 1.8～2.2kg/t pro-molten refining slag and 0.5～0.8kg/t fluorite, wherein, pro-molten refining slag comprises 50～55% calcium oxide, 5～10% silicon-dioxide, 30～35% aluminium sesquioxides, and surplus is an auxiliary material.
3, the production technique of low carbon low silicon aluminium killed steel as claimed in claim 1, it is characterized in that, in the step (1) that carry out at the Argon station, the aluminum steel consumption is 1.0～1.7kg/t, be operating as: aluminum steel consumption 1.7kg/t is a radix during with molten steel carbon containing 0.03%, and during the every increase by 0.01% of carbon content, the aluminum steel consumption reduces 0.1kg/t, minimum amount is 1.0kg/t, and said deaeration time is 2～3min.
4, the production technique of low carbon low silicon aluminium killed steel as claimed in claim 1, it is characterized in that, in the step (2) that carry out at the Argon station, the residue adjustment operation comprises: add 0.3～0.8kg/t fluorite, 0.3～0.5kg/t aluminum shot and 0.1～0.2kg/t calcium carbide slag is carried out deoxidation; Said strong BOTTOM ARGON BLOWING stirs and is: employing intensity is 3.0～4.0Nm
3The BOTTOM ARGON BLOWING of/mint stirs molten steel; The said slag making time is 4～6min.
5, the production technique of low carbon low silicon aluminium killed steel as claimed in claim 1 is characterized in that, in the step (3) that carry out at the Argon station, said weak BOTTOM ARGON BLOWING stirs and is: employing intensity is 0.5～1.0Nm
3The BOTTOM ARGON BLOWING of/mint stirs molten steel, and the said soft blow time is 4～6min.
6, the production technique of low carbon low silicon aluminium killed steel as claimed in claim 1 is characterized in that, in the step (4) that carry out at the Argon station, described silico-calcium cored-wire adding speed is 0.15kg/s, and consumption is 1.2～1.6kg/t.
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