CN103572001A - Method for controlling alkalinity of ultra-low-sulfur steel LF (ladle furnace) slag - Google Patents
Method for controlling alkalinity of ultra-low-sulfur steel LF (ladle furnace) slag Download PDFInfo
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- CN103572001A CN103572001A CN201310534316.4A CN201310534316A CN103572001A CN 103572001 A CN103572001 A CN 103572001A CN 201310534316 A CN201310534316 A CN 201310534316A CN 103572001 A CN103572001 A CN 103572001A
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Abstract
The invention discloses a method for controlling the alkalinity of ultra-low-sulfur steel LF (ladle furnace) slag. The method is characterized by comprising the following steps of optimizing a converter smelting process and a refining LF smelting process, discharging steel at high temperature by using a converter, performing forced deoxidization and large-slag-amount ladle operation in a steel discharging process, quickly forming high-alkalinity high-reducibility white slag in the early stage of a refining LF, performing deoxidization and desulphurization slag formation and bottom-blown argon flow control in a refining process, and adding a proper amount of alkalinity regulator in middle and later refining stages to quickly regulate the alkalinity of the ladle top slag of the refining LF to reduce the alkalinity of the LF slag to 4 to 7 to realize stable control over the alkalinity in a refining process of the LF. According to the method, the ladle top slag in the later refining stage is high in reducibility and flowability, a molten steel refining effect is achieved, and the internal quality of a continuous casting billet is improved.
Description
Technical field
The present invention relates to a kind of process for making of field of metallurgy, relate to the control method of smelting ultralow-sulfur steel ([S]≤0.0010%) LF refining process ladle top slag basicity.
Background technology
The height of steelmaking process basicity of slag is to liquid steel dephosphorization, desulfurization and removal of inclusions important, particularly smelt ultralow-sulfur steel process, LF refining furnace is for the needs of dark desulfurization, process early stage and need make fast high alkalinity strong reducing property desulfurization slag, lime consumption is bigger than normal, when in molten steel, sulphur is reduced to steel grade requirement, LF stove ladle top slag basicity is generally more than 8, and the highest meeting of basicity reaches 13.The ladle top slag of high alkalinity like this, mobility is poor, poor to the adsorptive power of foreign substance in molten steel, is unfavorable for the raising of Molten Steel Cleanliness.Now, desulfurization needs high basicity slag and foreign substance in molten steel are removed the good fluidity low basicity slag contradiction needing.Particularly smelt the ultralow-sulfur steel of high added value, there will be because molten steel sulphur content exceeds standard or foreign substance in molten steel exceeds standard and the series of problems such as changes the original sentence to.In order to break through these restrictive conditions, develop a kind of control by stages refining furnace ladle top slag basicity, compatible molten steel desulfurizing and the refining furnace slagging process that removal is mingled with, be a problem being badly in need of solution.
Summary of the invention
Object of the present invention is just to overcome existing defect, and a kind of ultralow-sulfur steel LF refining furnace ladle top slag basicity of slag control method is provided.
The technical scheme that the present invention realizes above goal of the invention is:
A kind of ultralow-sulfur steel LF basicity of slag control method, it is characterized in that converter smelting process and LF refining furnace smelting technology to be optimized, by converter high temperature, tap, the large quantity of slag operation of the strong deoxidation of tapping process and ladle, LF refining furnace is made high alkalinity strong reducing property white slag in earlier stage fast, the control of refining process deoxidation, desulfurization slag making and argon bottom-blowing, the refining middle and later periods is added appropriate basicity adjusting agent, rapid adjustment refining furnace ladle top slag basicity, reduce in LF basicity of slag to 4～7, realize the stable control of LF stove refining process basicity.
Further, the optimization of converter smelting process comprises:
(1) terminal operation: improve catch carbon hit rate one time, avoid a little blowing, prevent Molten Steel over-oxidation; Control tapping temperature and be greater than 1640 ℃, improve LF refining furnace desulfurization degree in early stage;
(2) pushing off the slag operation: strictly control the lower quantity of slag in tapping process, alleviate LF stove deoxidation slag making pressure;
(3) tapping deoxidization slagging regime: tapping process adds lime 5Kg/ steel, composite refining slag 4Kg/ steel, adds the reductor containing Al, while guaranteeing that LF stove is processed station in molten steel Al content within the scope of 0.010%-0.040%.
The optimization of LF refining furnace smelting technology comprises:
(1) LF stokehold phase operation: molten steel is everywhere behind science and engineering position, argon flow amount break shell with 50～200NL/min, actual argon flow amount, according to the ventilative situation adjustment of this heat, for sampling analysis after electrochemical slag 4～5min, adds first deoxidation slag material according to slag condition viscosity;
(2) LF sulfur removal technology in mid-term: heated by electrodes heats up, large argon gas stirring desulphurization, ladle bottom blowing argon flow amount 500～600NL/min, between heating period, LF stove is carried out micro-pressure operation; According to first steel sample ingredient of LF stove and slag condition thickness situation, add second batch deoxidation slag material, by steel grades, carry out alloying simultaneously; Large argon gas stir alloy and desulfurization, ladle bottom blowing argon flow amount 500～600NL/min; Sampling analysis, if second steel sample sulphur content meets steel grades requirement, feeds aluminum steel and mends aluminium content in molten steel, carries out the fine setting of composition and temperature after hello aluminum steel; Otherwise continue to add the 3rd batch of deoxidation slag material, the large argon gas stirring desulphurization of ladle, until meet the demands, feeds aluminum steel and mends aluminium content in molten steel;
(3) the LF stove later stage is adjusted basicity: after aluminium content finishes in hello aluminum steel benefit molten steel, add basicity adjusting agent to optimize slag system, and add-on 0.50-0.60Kg/t, for electrochemical slag 3～4min, soft stirring 5min, ladle bottom blowing argon flow amount 10～60Nl/min, processing finishes.
Ultralow-sulfur steel LF basicity of slag control method of the present invention adopts the technique of control by stages LF stove ladle top slag basicity, realized the stable control of LF stove refining process basicity of slag, make refining later stage ladle top slag both there is strong reducing property, have good mobility concurrently simultaneously, improve the ability of ladle top slag dross inclusion adsorption, the needs of compatible refining furnace molten steel desulfurizing and removal of inclusions, reached the effect of liquid steel refining, improved continuously cast bloom internal soundness, reduced that strand is changed the original sentence to and rejection number, improved economic benefit.
Accompanying drawing explanation
Fig. 1 is ultralow-sulfur steel LF basicity of slag control method schema.
Fig. 2 is slag specimen contrast effect figure before and after basicity adjusting agent adds.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail.
As shown in Figure 1, ultralow-sulfur steel LF basicity of slag control method of the present invention comprises:
1, the optimization of converter smelting process
(1) terminal operation.Improve one time catch carbon hit rate, avoid a little blowing, prevent Molten Steel over-oxidation.Control tapping temperature and be greater than 1640 ℃, improve LF refining furnace desulfurization degree in early stage.
(2) pushing off the slag operation.The strict lower quantity of slag of controlling in tapping process, controls the lower quantity of slag≤2kg/t, alleviates LF stove deoxidation slag making pressure.
(3) tapping deoxidization slagging regime.Tapping process adds lime 5Kg/ steel, composite refining slag 4Kg/ steel, adds the reductor containing Al, while guaranteeing that LF stove is processed station in molten steel Al content within the scope of 0.010%-0.040%.
Before converter smelting, first molten iron is carried out to desulfurization pre-treatment, guarantee to add converter molten steel sulfur content to be not more than 0.005%.
2, the optimization of LF refining furnace smelting technology
(1) LF stokehold phase operation.Molten steel is everywhere behind science and engineering position, and with the argon flow amount break shell of 50～200NL/min, actual argon flow amount is according to the ventilative situation adjustment of this heat.For sampling analysis after electrochemical slag 4～5min, add first deoxidation slag material, amount of lime is not more than 3kg/t steel, and aluminium wire amount is not more than 0.40kg/t steel, according to slag condition viscosity, adds fluorite amount to be not more than 1kg/t steel.
(2) LF sulfur removal technology in mid-term.Heated by electrodes heats up, large argon gas stirring desulphurization, and ladle bottom blowing argon flow amount 500～600NL/min, between heating period, LF stove should be carried out micro-pressure operation.According to first steel sample ingredient of LF stove and slag condition thickness situation, add second batch deoxidation slag material, lime adding amount is not more than 2kg/t steel, and aluminium wire add-on is not more than 0.20kg/t steel, fluorite amount is not more than 0.50kg/t steel, carries out alloying (except Al composition) by steel grades simultaneously.Large argon gas stir alloy and desulfurization, ladle bottom blowing argon flow amount 500～600NL/min.If second steel sample sulphur content meets steel grades requirement ([S]≤0.0010%), feed aluminum steel and mend aluminium content in molten steel, after line feeding, carry out the fine setting of composition and temperature, composition and temperature are adjusted to steel grade claimed range.If the second sample sulphur content does not meet steel grades requirement ([S]≤0.0010%), continue to add the 3rd batch of deoxidation slag material, the large argon gas stirring desulphurization of ladle, until meet the demands, feeds aluminum steel and mends aluminium content in molten steel.
(3) the LF stove later stage is adjusted basicity.After in hello aluminum steel benefit molten steel, aluminium content finishes, (component of basicity adjusting agent and weight percent thereof are: SiO to add basicity adjusting agent
2: 90%-93%, Al
2o
3: 6%-8%, Al:1%-3%) optimize slag system, add-on 0.50-0.60Kg/t, for electrochemical slag 3～4min, soft stirring 5min(ladle bottom blowing argon flow amount 10～60Nl/min), processing finishes.
Embodiment 1
The present embodiment selects 150t converter, LF refining furnace to smelt X70MS steel grade, and its finished product sulphur content requires to be less than 0.0010%, and whole smelting process is controlled as follows:
(1) bessemerize
Blow end point composition and temperature are controlled in Table 1.
Table 1 converter terminal composition and auxiliary material amount
(2) refining technique in early stage
Molten steel is science and engineering position everywhere, and with argon flow amount break shell, actual argon flow amount is according to the ventilative situation adjustment of this heat.For sampling analysis after electrochemical slag 4～5min, add first deoxidation slag material.Design parameter is in Table 2.
Table 2 refining Primary Stage Data (%)
(3) refining technique in mid-term
Heated by electrodes heats up, large argon gas stirring desulphurization, and ladle bottom blowing argon flow amount 500～600NL/min, between heating period, LF stove should be carried out micro-pressure operation.According to first steel sample ingredient of LF stove and slag condition thickness situation, add second batch deoxidation slag material, by steel grades, carry out alloying (except Al composition) simultaneously.Design parameter is in Table 3.
Table 3 refining data in mid-term (%)
(4) refining later stage technique
(component of basicity adjusting agent and weight percent thereof are: SiO to add basicity adjusting agent
2: 90%-93%, Al
2o
3: 6%-8%, Al:1%-3%, the present embodiment adopts SiO
2: 92%, Al
2o
3: 7%, Al:1%) optimize slag system, for electrochemical slag 3～4min, soft stirring 5min(ladle bottom blowing argon flow amount 10～60Nl/min), processing finishes.Design parameter is in Table 4.
Table 4 refining later data (%)
(5) effect is shown
Before and after basicity adjusting agent adds, slag specimen composition correlation data is in Table 5, and slag specimen effect contrast figure sees accompanying drawing 2.
Slag specimen composition before and after table 5 basicity adjusting agent adds
According to table 5 and Fig. 2 slag sample analysis result, before and after basicity adjusting agent adds, in slag, pore increases relatively, and foaminess increases; In slag, basicity has obvious reduction, wherein adds basicity in rear slag to be all controlled in 6.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (5)
1. a ultralow-sulfur steel LF basicity of slag control method, it is characterized in that converter smelting process and LF refining furnace smelting technology to be optimized, by converter high temperature, tap, the large quantity of slag operation of the strong deoxidation of tapping process and ladle, LF refining furnace is made high alkalinity strong reducing property white slag in earlier stage fast, the control of refining process deoxidation, desulfurization slag making and argon bottom-blowing flow, the refining middle and later periods is added appropriate basicity adjusting agent, rapid adjustment refining furnace ladle top slag basicity, reduce in LF basicity of slag to 4～7, realize the stable control of LF stove refining process basicity.
2. ultralow-sulfur steel LF basicity of slag control method according to claim 1, is characterized in that the optimization of converter smelting process comprises:
(1) terminal operation: improve catch carbon hit rate one time, avoid a little blowing, prevent Molten Steel over-oxidation; Control tapping temperature and be greater than 1640 ℃, improve LF refining furnace desulfurization degree in early stage;
(2) pushing off the slag operation: strictly control the lower quantity of slag in tapping process, alleviate LF stove deoxidation slag making pressure;
(3) tapping deoxidization slagging regime: tapping process adds lime 5Kg/ steel, composite refining slag 4Kg/ steel, adds the reductor containing Al, while guaranteeing that LF stove is processed station in molten steel Al content within the scope of 0.010%-0.040%.
3. ultralow-sulfur steel LF basicity of slag control method according to claim 1, is characterized in that the optimization of LF refining furnace smelting technology comprises:
(1) LF stokehold phase operation: molten steel is everywhere behind science and engineering position, argon flow amount break shell with 50～200NL/min, actual argon flow amount, according to the ventilative situation adjustment of this heat, for sampling analysis after electrochemical slag 4～5min, adds first deoxidation slag material according to slag condition viscosity;
(2) LF sulfur removal technology in mid-term: heated by electrodes heats up, large argon gas stirring desulphurization, ladle bottom blowing argon flow amount 500～600NL/min, between heating period, LF stove is carried out micro-pressure operation; According to first steel sample ingredient of LF stove and slag condition thickness situation, add second batch deoxidation slag material, by steel grades, carry out alloying simultaneously; Large argon gas stir alloy and desulfurization, ladle bottom blowing argon flow amount 500～600NL/min; Sampling analysis, if second steel sample sulphur content meets steel grades requirement, feeds aluminum steel and mends aluminium content in molten steel, carries out the fine setting of composition and temperature after hello aluminum steel; Otherwise continue to add the 3rd batch of deoxidation slag material, the large argon gas stirring desulphurization of ladle, until meet the demands, feeds aluminum steel and mends aluminium content in molten steel;
(3) the LF stove later stage is adjusted basicity: after aluminium content finishes in hello aluminum steel benefit molten steel, add basicity adjusting agent to optimize slag system, add-on 0.50-0.60Kg/t, for electrochemical slag 3～4min, soft stirring 5min, ladle bottom blowing argon flow amount 10～60 Nl/min, processing finishes.
4. ultralow-sulfur steel LF basicity of slag control method according to claim 3, it is characterized in that in first deoxidation slag material, amount of lime is not more than 3kg/t steel, aluminium wire amount is not more than 0.40kg/t steel, fluorite amount is not more than 1 kg/t steel, in second batch deoxidation slag material, amount of lime is not more than 2kg/t steel, aluminium wire amount is not more than 0.20kg/t steel, and fluorite amount is not more than 0.50kg/t steel.
5. ultralow-sulfur steel LF basicity of slag control method according to claim 3, is characterized in that the component of basicity adjusting agent and weight percent thereof are: SiO
2: 90%-93%, Al
2o
3: 6%-8%, Al:1%-3%.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103898269A (en) * | 2014-04-02 | 2014-07-02 | 南京钢铁股份有限公司 | Ultralow sulfur steel quick smelting method |
| CN104278130A (en) * | 2014-09-23 | 2015-01-14 | 商洛学院 | Process of quickly regulating alkalinity of LF (ladle furnace) slag |
| CN105154626A (en) * | 2015-10-08 | 2015-12-16 | 山东钢铁股份有限公司 | Method for controlling ladle furnace (LF) refining slag system |
| CN105838846A (en) * | 2016-05-19 | 2016-08-10 | 山东钢铁股份有限公司 | Method for controlling basicity of LF refining slag |
| CN106399638A (en) * | 2016-08-26 | 2017-02-15 | 武汉钢铁股份有限公司 | Efficient ladle furnace refining method based on thin-slab casting and rolling production of high-strength steel |
| CN107574286A (en) * | 2017-08-09 | 2018-01-12 | 新疆八钢铁股份有限公司 | The method of LF refining furnace smelting process desulfurization rapidly |
| CN107604120A (en) * | 2017-09-12 | 2018-01-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-phosphorous low-sulfur method for making steel |
| CN107653358A (en) * | 2017-08-09 | 2018-02-02 | 新疆八钢铁股份有限公司 | The method of the quick deoxidation of LF refining furnace smelting process |
| CN113088612A (en) * | 2021-03-15 | 2021-07-09 | 石家庄钢铁有限责任公司 | Method for pretreating and desulfurizing molten iron by using LF (ladle furnace) |
| CN113234892A (en) * | 2021-04-29 | 2021-08-10 | 南京钢铁股份有限公司 | Method for improving desulfurization rate of bearing steel in LF (ladle furnace) refining process |
| CN113584258A (en) * | 2021-07-28 | 2021-11-02 | 北京首钢股份有限公司 | Method for reducing aluminum loss rate in LF refining process |
| CN115401177A (en) * | 2022-08-02 | 2022-11-29 | 首钢京唐钢铁联合有限责任公司 | Low-carbon steel continuous casting and rolling smelting method capable of avoiding blockage of stopper rod |
| CN116004947A (en) * | 2023-02-09 | 2023-04-25 | 广东中南钢铁股份有限公司 | Method for low-temperature rapid desulfurization of low-sulfur steel under low iron-steel ratio |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2669270C1 (en) * | 2017-07-18 | 2018-10-09 | Общество с ограниченной ответственностью "Евросинтез" | Fluidized lime for desulfurization of hot metal and steel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010116611A (en) * | 2008-11-13 | 2010-05-27 | Kobe Steel Ltd | Method for manufacturing low-sulfur thick steel plate excellent in haz toughness at the time of inputting large amount of heat |
| CN102787209A (en) * | 2011-12-07 | 2012-11-21 | 鞍钢股份有限公司 | Method for producing ultra-low sulfur steel under high vacuum |
| JP2013127087A (en) * | 2011-12-16 | 2013-06-27 | Jfe Steel Corp | Method for producing high purity steel |
-
2013
- 2013-11-01 CN CN201310534316.4A patent/CN103572001B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010116611A (en) * | 2008-11-13 | 2010-05-27 | Kobe Steel Ltd | Method for manufacturing low-sulfur thick steel plate excellent in haz toughness at the time of inputting large amount of heat |
| CN102787209A (en) * | 2011-12-07 | 2012-11-21 | 鞍钢股份有限公司 | Method for producing ultra-low sulfur steel under high vacuum |
| JP2013127087A (en) * | 2011-12-16 | 2013-06-27 | Jfe Steel Corp | Method for producing high purity steel |
Non-Patent Citations (4)
| Title |
|---|
| 姜周华等: "LF炉冶炼超低硫钢的工艺条件", 《东北大学学报（自然科学版）》 * |
| 张立明等: "LF精炼炉脱硫效率生产实践", 《黑龙江冶金》 * |
| 李建设等: "LF炉快速深脱硫工艺开发与实践", 《河北冶金》 * |
| 王郢等: "齿轮钢20CrMoH脱硫的热力学研究", 《钢铁》 * |
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| CN103898269A (en) * | 2014-04-02 | 2014-07-02 | 南京钢铁股份有限公司 | Ultralow sulfur steel quick smelting method |
| CN103898269B (en) * | 2014-04-02 | 2016-01-20 | 南京钢铁股份有限公司 | The quick smelting process of a kind of ultralow-sulfur steel |
| CN104278130A (en) * | 2014-09-23 | 2015-01-14 | 商洛学院 | Process of quickly regulating alkalinity of LF (ladle furnace) slag |
| CN105154626A (en) * | 2015-10-08 | 2015-12-16 | 山东钢铁股份有限公司 | Method for controlling ladle furnace (LF) refining slag system |
| CN105838846A (en) * | 2016-05-19 | 2016-08-10 | 山东钢铁股份有限公司 | Method for controlling basicity of LF refining slag |
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| CN113234892A (en) * | 2021-04-29 | 2021-08-10 | 南京钢铁股份有限公司 | Method for improving desulfurization rate of bearing steel in LF (ladle furnace) refining process |
| CN113584258A (en) * | 2021-07-28 | 2021-11-02 | 北京首钢股份有限公司 | Method for reducing aluminum loss rate in LF refining process |
| CN113584258B (en) * | 2021-07-28 | 2023-02-28 | 北京首钢股份有限公司 | Method for reducing aluminum loss rate in LF refining process |
| CN115401177A (en) * | 2022-08-02 | 2022-11-29 | 首钢京唐钢铁联合有限责任公司 | Low-carbon steel continuous casting and rolling smelting method capable of avoiding blockage of stopper rod |
| CN115401177B (en) * | 2022-08-02 | 2024-06-07 | 首钢京唐钢铁联合有限责任公司 | Low-carbon steel continuous casting and rolling smelting method capable of avoiding plug rod blockage |
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