CN103468865B - Method for controlling silicon content in low-silicon aluminum steel refining process - Google Patents
Method for controlling silicon content in low-silicon aluminum steel refining process Download PDFInfo
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- CN103468865B CN103468865B CN201310438240.5A CN201310438240A CN103468865B CN 103468865 B CN103468865 B CN 103468865B CN 201310438240 A CN201310438240 A CN 201310438240A CN 103468865 B CN103468865 B CN 103468865B
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Abstract
The invention discloses a method for controlling a silicon content in a low-silicon aluminum steel refining process. The method comprises the following steps of 1) hoisting a steel ladle to a steel ladle refining furnace; 2) adding lime and refining slag while heating, wherein the weight ratio of the liquid steel to the lime to the refining slag is 1150: (1.75-2.25): (0.85-1.17); and adding aluminum shots according to the upper limit of acid-soluble aluminum; 3) taking a slag sample after soft blowing, supplementing the lime and the refining slag, wherein the weight ratio of the liquid steel to the lime to the refining slag is 1150: (1-3): (2-4); next, adjusting the slag to light green, and adding the aluminum shots according to the medium upper limit of acid-soluble aluminum; 4) feeding a calcium-iron line by 500-800 m after soft blowing and then conveying the same to a continuous casting machine, and guaranteeing the final slag alkalinity within the range from 4.8 to 5.2 and the sum of the content of FeO and the content of MnO to be 1.0-1.5% of the total weight of the slag. The method provided by the invention is capable of meeting the requirements of liquid steel deoxidization and slag formation, and also capable of controlling the silicon content of the liquid steel in a rational range; and therefore, the method is widely applicable to the technical field of ferrous metallurgical secondary refining.
Description
Technical field
The present invention relates to ferrous metallurgy furnace outer refining technology field, refer to a kind of method controlling silicone content in low sial steel refining technique particularly.
Background technology
Silicone content in low sial steel is generally less than 0.08%, and some steel grade is even lower, in refining process, even if the strict alloy controlled containing element silicon adds, still can exist and increase silicon phenomenon.Especially open and water stove, owing to ensureing that inclusion fully floats and coordinates the reasons such as casting machine rhythm, make refining time long, cause increasing silicon phenomenon obvious, offscale cannot the opening of various composition is watered, make production easily sink into pause, therefore controlling the increasing silicon phenomenon of low sial steel in ladle refining furnace refining process is a very important job.
In existing refining techniques, for ensureing to remove oxidisability inclusion, these inclusiones can fully be adsorbed, the technology of reductibility white slag is made in general employing, especially fully remove the aluminium system inclusion in steel, prevent molten steel dross in casting cycle, the large quantity of slag is adopted to make white slag technology especially, under such reducing atmosphere, although inclusion is removed, but cause finishing slag basicity to be greater than 9, the content sum of FeO and MnO is less than 0.6% of slag gross weight, silicon in slag by the aluminium reducing in steel in molten steel, molten steel is made to increase silicon, this process is generally undertaken by following principle:
wherein, Δ G=-111.23+0.0193T
From the thermodynamic condition needed for this reaction, when refining treatment medial temperature reaches 1600 DEG C, Δ G=-75.1<0, illustrates that reaction is carried out to forward, towards the trend development increasing silicon.In ladle refining furnace refining process, due to the effect of Bottom Argon Stirring, add the area of slag interface, from the kinetic model of liquid--liquid reaction---bimodulus theory, the phase interface area of reaction increases, interfacial chemical reaction speed can be caused to increase, for increasing pasc reaction provides good dynamic conditions, the easier direction to increasing silicon of reaction is carried out.As can be seen here, low sial steel increases silicon in refining process is inevitable.
Summary of the invention
Object of the present invention will provide a kind of technique simple exactly, the reductibility of Reasonable Regulation And Control refining slag, both lime, refining slag and aluminum shot consumption had been reduced, meet the requirement of deoxidation of molten steel slag making, ensure that again the silicone content of molten steel controls at zone of reasonableness, in the extra high low sial steel refining technique of production efficiency, control the method for silicone content simultaneously.
For achieving the above object, control the method for silicone content in the low sial steel refining technique designed by the present invention, comprise the steps: 1) by argon station by preliminary for the molten steel in ladle slag making, subsequently ladle is winched in ladle refining furnace; 2) liquid steel temperature is measured, heat-up time is determined according to the actual liquid steel temperature measured, the heat target value of 1630 DEG C and the heat-up rate of 3 ~ 5 DEG C/min, ensure that once heating puts in place, and in heat-processed, add lime and refining slag, wherein, the weight part of molten steel, lime and refining slag is respectively 1150: 1.75 ~ 2.25: 0.85 ~ 1.17, simultaneously, according to slag specimen color and the composition being in argon station stage molten steel, add aluminum shot according to the upper limit of acid-soluble aluminum content in different steel grade; 3) molten steel heating terminates rear soft blow 3 ~ 5 minutes, soft blow slag removing sample, according to the color of slag specimen and the mobility of slag, add lime and refining slag, wherein, the weight part of molten steel, lime and refining slag is respectively 1150: 1 ~ 3: 2 ~ 4, ensures to make the color of slag adjust to light green while bits have good fluidity, then according to the composition of bits at top of the slag spreading aluminum shot, guarantee that the aluminum shot added can not make acid-soluble aluminum content exceed the wherein upper limit; 4) soft blow 3 ~ 5 minutes again after spreading aluminum shot, feeds the calcium iron wire of 500 ~ 800m, finally serves continuous caster after soft blow, ensure that finishing slag basicity controls between 4.8 ~ 5.2, FeO and MnO content sum controls in 1.0 ~ 1.5% of slag gross weight.
Preferably, in step 2) in, in heat-processed, molten steel is respectively 1150: 2: 2 with the weight part of the lime added and refining slag.
Further, in step 3), molten steel heating terminates rear soft blow 4 minutes, and molten steel is respectively 1150: 2.2: 3 with the weight part of the lime added and refining slag.
Again further, in step 4), soft blow adds the calcium iron wire of 700m after 4 minutes, and ensures that finishing slag basicity controls to control in 1.3% of slag gross weight at 5.0, FeO and MnO content sum.
Also further, described soft blow is argon gas is adjusted to the state that the top of the slag is wriggled.
Further, in step 2) in, in heat-processed, heat-up rate is 4 DEG C/min.
Principle of work of the present invention is such: from aforesaid background technology, control molten steel and increase silicon, must adopt the source controlling silicon in slag, the reductibility reducing refining slag, reduces Argon intensity, reduce the means such as heating times and time.
Above-mentioned steps 2) in, thermometric is to determine the time of heating, in heat-processed, molten steel stirs large, the loss ratio of aluminium is higher, aluminum shot should be added in right amount when temperature is low, ensure that deoxidation in early stage is abundant, add lime and refining slag is in order to slagging morning, the amount added is not the reductibility in order to control bits very much, because quantity of slag general trend of events necessity adds more aluminum shot, to ensure that acid-soluble aluminum content in the reasonable scope, and add the reductibility grow that a large amount of aluminum shots can make bits, so control add-on can control silicon in slag source from source.
Above-mentioned steps 3) in, can not get slag specimen after having heated, the bits oxidisability after just having heated is partially strong, and the composition of bits is also uneven, and too early sampling can cause the color error in judgement to bits at once.The time that every stove steel processes in ladle refining furnace is not oversize, has little time to send slag specimen to see the data such as basicity and oxidisability, can only judge basicity by the color of bits, and from the relation of the color of adding up at ordinary times and basicity, color is whiter, and basicity is higher; Color is partially green, and basicity is lower.According to the color of bits suitable add lime, control basicity.
Above-mentioned steps 4) in, controlling argon gas is to prevent molten steel slag, cause secondary pollution, also be the speed that driven terms of mechanics reduction silicon is reduced simultaneously, experiment proves that FeO and MnO content sum is less than the requirement that 1.5% of slag gross weight just can meet deoxidation slag making, turn avoid silicone content too high simultaneously.
The present invention is by controlling the add-on of lime and aluminum shot, the reductibility of Reasonable Regulation And Control refining slag, both ensure that inclusion can be sufficiently removed, floats and adsorb, and in turn ensure that reductibility can not be too strong, thus control the increasing silicon phenomenon of molten steel, for good place mat made by smelting low-silicon aluminum steel.
In sum, the invention has the advantages that: compared with prior art, can while reduction lime, refining slag and aluminum shot consume, meet the requirement of deoxidation of molten steel slag making, avoid again causing molten steel to increase silicon phenomenon obvious simultaneously, by adding lime in batches, finishing slag basicity is effectively controlled about 5, FeO and MnO content sum is made to control between 1.0-1.5% of slag gross weight, the ratio making molten steel increase silicon is down to less than 0.9%, and the reductibility reduced because of finishing slag causes by force producing the probability sinking into pause.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail:
Embodiment 1:
Make steel subsidiary factory's ladle refining furnace refining steel cotton thread for Wuhan Iron and Steel Plant share web head factory one below, the embodiment controlling the method for silicone content in low sial steel refining technique is described, it comprises the steps:
1) by argon station by preliminary for the molten steel in ladle slag making, subsequently ladle is winched in ladle refining furnace.
2) measuring liquid steel temperature is 1585 DEG C, determine that heat-up time is 15 minutes according to the heat-up rate that the actual liquid steel temperature, the heat target value that measure are 1630 DEG C and 3 DEG C/min, ensure that once heating puts in place, and be add 175kg lime and 85kg refining slag in the molten steel of 115 tons to weight in heat-processed, simultaneously, according to slag specimen color and the composition being in argon station stage molten steel, the upper limit being 400ppm dissolved aluminum according to content in steel wool strands adds aluminum shot.
3) argon gas to be adjusted to state that the top of the slag is wriggled and soft blow 3 minutes by molten steel heating after terminating, soft blow slag removing sample, according to the color of slag specimen and the mobility of slag, be add 100kg lime and 200kg refining slag in the molten steel of 115 tons to weight, ensure to make the color of slag adjust to light green while bits have good fluidity, then according to the composition of bits at top of the slag spreading aluminum shot, after guaranteeing to add aluminum shot, acid-soluble aluminum content is no more than 250ppm.
4) soft blow feeds the calcium iron wire of 500m after 3 minutes, finally serves continuous caster, ensures that finishing slag basicity controls to control in 1.0% of slag gross weight at 4.8, FeO and MnO content sum.
Embodiment 2:
The present embodiment is substantially the same manner as Example 1, difference is: 2) measuring liquid steel temperature is 1558 DEG C, heat-up rate according to the actual liquid steel temperature measured, heat target value and 4 DEG C/min determines that heat-up time is 18 minutes, and in heat-processed, add 200kg lime and 100kg refining slag.
3) heated soft blow 4 minutes, and added the lime of 220kg and the refining slag of 300kg, after then guaranteeing to add aluminum shot, acid-soluble aluminum content is no more than 330ppm.
4) soft blow feeds the calcium iron wire of 700m after 4 minutes, and ensures that finishing slag basicity controls to control in 1.3% of slag gross weight at 5.0, FeO and MnO content sum.
Embodiment 3:
The present embodiment is substantially the same manner as Example 1, difference is: 2) measuring liquid steel temperature is 1535 DEG C, heat-up rate according to the actual liquid steel temperature measured, heat target value and 5 DEG C/min determines that heat-up time is 19 minutes, and in heat-processed, add 225kg lime and 117kg refining slag.
3) heated soft blow 5 minutes, and added the lime of 300kg and the refining slag of 400kg, after then guaranteeing to add aluminum shot, acid-soluble aluminum content is no more than 400ppm.
4) soft blow feeds the calcium iron wire of 800m after 5 minutes, and ensures that finishing slag basicity controls to control in 1.5% of slag gross weight at 5.2, FeO and MnO content sum.
Claims (6)
1. control a method for silicone content in low sial steel refining technique, it is characterized in that: comprise the steps:
1) by argon station by preliminary for the molten steel in ladle slag making, subsequently ladle is winched in ladle refining furnace;
2) liquid steel temperature is measured, heat-up time is determined according to the actual liquid steel temperature measured, the heat target value of 1630 DEG C and the heat-up rate of 3 ~ 5 DEG C/min, ensure that once heating puts in place, and in heat-processed, add lime and refining slag, wherein, the weight part of molten steel, lime and refining slag is respectively 1150: 1.75 ~ 2.25: 0.85 ~ 1.17, simultaneously, according to slag specimen color and the composition being in argon station stage molten steel, add aluminum shot according to the upper limit of acid-soluble aluminum content in different steel grade;
3) molten steel heating terminates rear soft blow 3 ~ 5 minutes, soft blow slag removing sample, according to the color of slag specimen and the mobility of slag, add lime and refining slag, wherein, the weight part of molten steel, lime and refining slag is respectively 1150: 1 ~ 3: 2 ~ 4, ensures to make the color of slag adjust to light green while bits have good fluidity, then according to the composition of bits at top of the slag spreading aluminum shot, guarantee that the aluminum shot added can not make acid-soluble aluminum content exceed the wherein upper limit;
4) soft blow 3 ~ 5 minutes again after spreading aluminum shot, feeds the calcium iron wire of 500 ~ 800m, finally serves continuous caster after soft blow, ensure that finishing slag basicity controls between 4.8 ~ 5.2, FeO and MnO content sum controls in 1.0 ~ 1.5% of slag gross weight.
2. control the method for silicone content in low sial steel refining technique according to claim 1, it is characterized in that: in step 2) in, in heat-processed, molten steel is respectively 1150: 2: 1.17 with the weight part of the lime added and refining slag.
3. in low sial steel refining technique according to claim 1 and 2, control the method for silicone content, it is characterized in that: in step 3) in, molten steel heating terminates rear soft blow 4 minutes, and molten steel is respectively 1150: 2.2: 3 with the weight part of the lime added and refining slag.
4. in low sial steel refining technique according to claim 1 and 2, control the method for silicone content, it is characterized in that: in step 4) in, soft blow adds the calcium iron wire of 700m after 4 minutes, and ensures that finishing slag basicity controls to control in 1.3% of slag gross weight at 5.0, FeO and MnO content sum.
5. control the method for silicone content in low sial steel refining technique according to claim 1 and 2, it is characterized in that: described soft blow is argon gas is adjusted to the state that the top of the slag is wriggled.
6. control the method for silicone content in low sial steel refining technique according to claim 1 and 2, it is characterized in that: in step 2) in, in heat-processed, heat-up rate is 4 DEG C/min.
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| US3982969A (en) * | 1975-10-02 | 1976-09-28 | Jones & Laughlin Steel Corporation | Low silicon high strength low alloy steel |
| JP2528748B2 (en) * | 1991-05-31 | 1996-08-28 | 日本鋼管株式会社 | Method of manufacturing silicon steel sheet by continuous line |
| CN100465291C (en) * | 2006-12-31 | 2009-03-04 | 武汉钢铁(集团)公司 | Production tech. of low carbon low silicon aluminium killed steel |
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Effective date of registration: 20170717 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuchang, Hubei Friendship Road, No. A, block, floor 999, 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |