CN103468865A - 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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- CN103468865A CN103468865A CN2013104382405A CN201310438240A CN103468865A CN 103468865 A CN103468865 A CN 103468865A CN 2013104382405 A CN2013104382405 A CN 2013104382405A CN 201310438240 A CN201310438240 A CN 201310438240A CN 103468865 A CN103468865 A CN 103468865A
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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 particularly control in a kind of low sial steel refining technique the method for silicone content.
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 the strict alloy of controlling containing element silicon adds, still can exist and increase the silicon phenomenon.Especially open and water stove, owing to guaranteeing that inclusion fully floats and coordinates the reason such as casting machine rhythm, make refining time long, cause that to increase the silicon phenomenon obvious, offscale can't the opening of various compositions watered, make to produce and easily sink into to pause, therefore controlling low the increase silicon phenomenon of sial steel in the ladle refining furnace refining process is a very important job.
In existing refining techniques, for guaranteeing to remove the oxidisability inclusion, these inclusiones can fully be adsorbed, the general technology of making the reductibility white slag that adopts, in particular for the aluminium of fully removing in steel, it is inclusion, prevent molten steel dross in casting cycle, adopt especially the large quantity of slag to make the white slag technology, 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, make molten steel increase silicon, this process is generally undertaken by following principle:
React required thermodynamic condition from this, when the refining treatment medial temperature reaches 1600 ℃, Δ G=-75.1<0, illustrate to react and carry out to forward, towards the trend development that increases silicon.In the ladle refining furnace refining process, effect due to Bottom Argon Stirring, increased the area of slag interface, kinetic model---bimodulus theory from the liquid-liquid phase reaction, the phase interface area change of reaction, can cause interfacial chemical reaction speed to increase, for increasing pasc reaction, provide good dynamic conditions that reaction is more easily carried out to the direction that increases silicon.As can be seen here, to increase silicon in refining process be inevitable to low sial steel.
Summary of the invention
Purpose of the present invention will provide a kind of technique simple exactly, the reductibility of Reasonable Regulation And Control refining slag, lime, refining slag and aluminum shot consumption had both been reduced, meet the requirement of deoxidation of molten steel slag making, the silicone content that guarantees again molten steel is controlled at zone of reasonableness, controls the method for silicone content in the extra high low sial steel refining technique of production efficiency simultaneously.
For achieving the above object, control the method for silicone content in the designed low sial steel refining technique of the present invention, comprise the steps: 1) by the argon station by the preliminary slag making of the molten steel in ladle, subsequently ladle is winched in ladle refining furnace; 2) measure liquid steel temperature, determine heat-up time according to actual liquid steel temperature, the heating target value of 1630 ℃ and the heat-up rate of 3～5 ℃/minute measured, guarantee that once heating puts in place, and add lime and refining slag in heat-processed, 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 composition in argon station stage molten steel, according to the upper limit of acid-soluble aluminum content in different steel grades, add aluminum shot; 3) the molten steel heating finishes 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, guarantees when bits have good fluidity to make the color of slag to adjust to light green, 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 surpass the wherein upper limit; 4) soft blow 3～5 minutes again after the spreading aluminum shot, feed the calcium iron wire of 500～800m after soft blow, finally serve continuous caster, guarantees that finishing slag basicity is controlled between 4.8～5.2, and FeO and MnO content sum are controlled at 1.0～1.5% of slag gross weight.
As preferred version, in step 2) in, in heat-processed, molten steel is respectively 1150: 2: 2 with the lime added and the weight part of refining slag.
Further, in step 3), after the molten steel heating finishes, soft blow is 4 minutes, and molten steel is respectively 1150: 2.2: 3 with the lime of adding and the weight part of refining slag.
Again further, in step 4), soft blow adds the calcium iron wire of 700m after 4 minutes, and guarantees that finishing slag basicity is controlled at 5.0, FeO and MnO content sum is controlled at 1.3% of slag gross weight.
Also further, described soft blow is for adjusting to argon gas the state that the top of the slag is wriggled.
Further, in step 2) in, in heat-processed, heat-up rate is 4 ℃/minute.
Principle of work of the present invention is such: from aforesaid background technology, control molten steel and increase silicon, must adopt the source of controlling silicon in slag, the reductibility that reduces refining slag, reduction Argon intensity, reduce the means such as heating times and time.
Above-mentioned steps 2) in, thermometric is in order to determine the time of heating, in heat-processed, molten steel stirs large, the loss ratio of aluminium is higher, should add in right amount aluminum shot when temperature is low, guarantee that the deoxidation in early stage is abundant, adding lime and refining slag is for slagging morning, the amount added is not in order to control the reductibility of bits very much, because quantity of slag general trend of events necessity adds more aluminum shot, to guarantee acid-soluble aluminum content in the reasonable scope, and add a large amount of aluminum shots can make the reductibility grow of bits, can control from source the source of silicon in slag so control add-on.
Above-mentioned steps 3) in, after having heated, can not get slag specimen, the bits oxidisability after just having heated is partially strong at once, and the composition of bits is also inhomogeneous, and sampling too early can cause the color error in judgement to bits.The time that every stove steel is processed in ladle refining furnace is not oversize, has little time to send slag specimen to see the data such as basicity and oxidisability, color judgement basicity that can only be by bits, and from the color of statistics and the relation of basicity at ordinary times, color is whiter, and basicity is higher; Color is partially green, and basicity is lower.According to the color of bits, the suitable lime that adds, control basicity.
Above-mentioned steps 4) in, controlling argon gas is in order to prevent the molten steel slag, cause secondary pollution, also that driven terms of mechanics reduces the speed that silicon is reduced simultaneously, experimental results show that FeO and MnO content sum are less than 1.5% of slag gross weight and just can meet the requirement of deoxidation slag making, avoided again 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 guaranteed that inclusion can fully be removed, float and absorption, guaranteed that again reductibility can be too not strong, thereby that controls molten steel increases the silicon phenomenon, for the smelting low-silicon aluminum steel has been made good place mat.
In sum, the invention has the advantages that: compared with prior art, can be when reducing lime, refining slag and aluminum shot consumption, meet the requirement of deoxidation of molten steel slag making, avoid again causing molten steel to increase the silicon phenomenon obvious simultaneously, by add lime in batches, finishing slag basicity effectively is controlled to 5 left and right, make FeO and MnO content sum be controlled at the slag gross weight 1.0-1.5% between, the ratio that makes molten steel increase silicon is down to below 0.9%, and the reductibility reduced because of finishing slag causes by force producing the probability that sinks into pause.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail:
Embodiment 1:
Below to take Wuhan Iron and Steel Plant share web head factory one steel-making subsidiary factory ladle refining furnace refining steel cotton thread be example, the embodiment of the method for control silicone content in low sial steel refining technique be described, it comprises the steps:
1) by the argon station by the preliminary slag making of the molten steel in ladle, subsequently ladle is winched in ladle refining furnace.
2) measuring liquid steel temperature is 1585 ℃, the heat-up rate that is 1630 ℃ and 3 ℃/minute according to the actual liquid steel temperature of measuring, heating target value determines that be 15 minutes heat-up time, guarantee that once heating puts in place, and add 175kg lime and 85kg refining slag in the molten steel that is 115 tons to weight in heat-processed, simultaneously, according to slag specimen color and the composition in argon station stage molten steel, the upper limit that is the molten aluminium of 400ppm acid according to content in steel wool strands adds aluminum shot.
3) after molten steel heating end, argon gas being adjusted to the state that the top of the slag is wriggled is soft blow 3 minutes, soft blow slag removing sample, according to the color of slag specimen and the mobility of slag, add 100kg lime and 200kg refining slag in the molten steel that is 115 tons to weight, guarantee when bits have good fluidity to make the color of slag to adjust to light green, then according to the composition of bits at top of the slag spreading aluminum shot, guarantee to add aluminum shot after acid-soluble aluminum content be no more than 250ppm.
4) soft blow feeds the calcium iron wire of 500m after 3 minutes, finally serves continuous caster, guarantees that finishing slag basicity is controlled at 4.8, FeO and MnO content sum is controlled at 1.0% of slag gross weight.
Embodiment 2:
The present embodiment is substantially the same manner as Example 1, difference is: 2) measuring liquid steel temperature is 1558 ℃, determine that according to the heat-up rate of the actual liquid steel temperature of measuring, heating target value and 4 ℃/minute be 18 minutes heat-up time, and add 200kg lime and 100kg refining slag in heat-processed.
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 guarantees that finishing slag basicity is controlled at 5.0, FeO and MnO content sum is controlled at 1.3% of slag gross weight.
Embodiment 3:
The present embodiment is substantially the same manner as Example 1, difference is: 2) measuring liquid steel temperature is 1535 ℃, determine that according to the heat-up rate of the actual liquid steel temperature of measuring, heating target value and 5 ℃/minute be 19 minutes heat-up time, and add 225kg lime and 117kg refining slag in heat-processed.
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 guarantees that finishing slag basicity is controlled at 5.2, FeO and MnO content sum is controlled at 1.5% of slag gross weight.
Claims (6)
1. control the method for silicone content in one kind low sial steel refining technique, it is characterized in that: comprise the steps:
1) by the argon station by the preliminary slag making of the molten steel in ladle, subsequently ladle is winched in ladle refining furnace;
2) measure liquid steel temperature, determine heat-up time according to actual liquid steel temperature, the heating target value of 1630 ℃ and the heat-up rate of 3～5 ℃/minute measured, guarantee that once heating puts in place, and add lime and refining slag in heat-processed, 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 composition in argon station stage molten steel, according to the upper limit of acid-soluble aluminum content in different steel grades, add aluminum shot;
3) the molten steel heating finishes 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, guarantees when bits have good fluidity to make the color of slag to adjust to light green, 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 surpass the wherein upper limit;
4) soft blow 3～5 minutes again after the spreading aluminum shot, feed the calcium iron wire of 500～800m after soft blow, finally serve continuous caster, guarantees that finishing slag basicity is controlled between 4.8～5.2, and FeO and MnO content sum are controlled at 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: 2 with the lime added and the weight part of refining slag.
3. 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 3), after the molten steel heating finishes, soft blow is 4 minutes, and molten steel is respectively 1150: 2.2: 3 with the lime of adding and the weight part of refining slag.
4. 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 4), soft blow adds the calcium iron wire of 700m after 4 minutes, and guarantees that finishing slag basicity is controlled at 5.0, FeO and MnO content sum is controlled at 1.3% of slag gross weight.
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 for adjusting to argon gas 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 ℃/minute.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113355483A (en) * | 2020-03-05 | 2021-09-07 | 马鞍山钢铁股份有限公司 | Deoxidation slagging technology for LF (ladle furnace) |
| CN113560509A (en) * | 2021-07-27 | 2021-10-29 | 上海电气上重铸锻有限公司 | Method for manufacturing low-silicon boron-controlled steel large steel ingot |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3982969A (en) * | 1975-10-02 | 1976-09-28 | Jones & Laughlin Steel Corporation | Low silicon high strength low alloy steel |
| JPH04354861A (en) * | 1991-05-31 | 1992-12-09 | Nkk Corp | Production of silicon steel sheet by continuous line |
| CN100999770A (en) * | 2006-12-31 | 2007-07-18 | 武汉钢铁(集团)公司 | Production tech. of low carbon low silicon aluminium killed steel |
| CN101225453A (en) * | 2007-12-11 | 2008-07-23 | 新疆八一钢铁股份有限公司 | Electric furnace smelting method for low-carbon low-silicon steel |
| CN101343677A (en) * | 2008-09-01 | 2009-01-14 | 湖南华菱涟源钢铁有限公司 | Process for manufacturing low-silicon low-carbon deep punching/drawing steel |
| CN102676727A (en) * | 2012-06-01 | 2012-09-19 | 南京钢铁股份有限公司 | Process for controlling smelting silicon content of low-silicon steel |
-
2013
- 2013-09-24 CN CN201310438240.5A patent/CN103468865B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3982969A (en) * | 1975-10-02 | 1976-09-28 | Jones & Laughlin Steel Corporation | Low silicon high strength low alloy steel |
| JPH04354861A (en) * | 1991-05-31 | 1992-12-09 | Nkk Corp | Production of silicon steel sheet by continuous line |
| CN100999770A (en) * | 2006-12-31 | 2007-07-18 | 武汉钢铁(集团)公司 | Production tech. of low carbon low silicon aluminium killed steel |
| CN101225453A (en) * | 2007-12-11 | 2008-07-23 | 新疆八一钢铁股份有限公司 | Electric furnace smelting method for low-carbon low-silicon steel |
| CN101343677A (en) * | 2008-09-01 | 2009-01-14 | 湖南华菱涟源钢铁有限公司 | Process for manufacturing low-silicon low-carbon deep punching/drawing steel |
| CN102676727A (en) * | 2012-06-01 | 2012-09-19 | 南京钢铁股份有限公司 | Process for controlling smelting silicon content of low-silicon steel |
Non-Patent Citations (1)
| Title |
|---|
| 段光豪 等: "《低硅铝镇静钢增硅问题的研究与控制》", 《武钢技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113355483A (en) * | 2020-03-05 | 2021-09-07 | 马鞍山钢铁股份有限公司 | Deoxidation slagging technology for LF (ladle furnace) |
| CN113560509A (en) * | 2021-07-27 | 2021-10-29 | 上海电气上重铸锻有限公司 | Method for manufacturing low-silicon boron-controlled steel large steel ingot |
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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. |