CN105603156B - The production method of super-low sulfur IF steel - Google Patents

The production method of super-low sulfur IF steel Download PDF

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CN105603156B
CN105603156B CN201610133702.6A CN201610133702A CN105603156B CN 105603156 B CN105603156 B CN 105603156B CN 201610133702 A CN201610133702 A CN 201610133702A CN 105603156 B CN105603156 B CN 105603156B
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steel
super
sulfur
content
slag
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CN105603156A (en
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张敏
曾建华
龚洪君
冉孟伦
李扬州
杨森祥
杨晓东
李平凡
彭友全
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The present invention relates to the production method of super-low sulfur IF steel, belong to technical field of ferrous metallurgy.Present invention solves the technical problem that it is to provide the production method of super-low sulfur IF steel.The technique that the inventive method is combined by using molten iron pretreatment desulfurizing, converter desulfurization with LF refining, RH refining desulfurations, molten iron pretreatment beginning is terminated desulfurization degree to LF and reach more than 93%, and by technology measures such as converter terminal carbon, temperature, oxygen activity control and the controls of LF, RH procedure parameter, realize the production of Ultra-low carbon, super-low sulfur IF steel.By the integrated application of the inventive method, the super-low sulfur IF steel production of finished product [C]≤0.002%, [S]≤0.004% is realized.This method is simple, easy to operate, and production cost is low, is suitable for producing greatly.

Description

The production method of super-low sulfur IF steel
Technical field
The present invention relates to the production method of super-low sulfur IF steel, belong to technical field of ferrous metallurgy.
Background technology
IF steel, i.e. ultra-low-carbon steel, refer to the steel of [C]≤0.005%, and product is widely used in automobile making, pop can manufacture Etc. industry.In order to obtain good deep drawability, the control of the element such as C, S, N in the Ultra-low carbon steel to steel of high-quality requires pole Height, the difficulty of production is very big, and only a small number of producers such as Baosteel, Anshan iron and steel plant of the country can produce at present, it is difficult to meet domestic market need Ask, need high-volume import every year.Therefore the IF steel of low-sulfur Ultra-low carbon is developed under existing situation, improving the existence energy of enterprise Power and enhancing the competitiveness has the function that important.
The patent of invention of Application No. 201310136410.4 discloses the smelting process of a kind of low-carbon, ultralow-sulfur steel, leads to Granule lime and fluorite are added when crossing tapping；Gained molten steel carries out LF stove slag refinings, completes slag making desulfurization, heating and alloy Change.Between finally obtaining carbon content 0.030%~0.040%, the mild steel of sulfur content≤0.0015%, steel obtained by this method is Mild steel, in converter tapping and alloy deoxidation is used, because rear process steel oxygen content in water is very low, ladle slag oxidizing is also very It is low, be advantageous to carry out molten steel depth desulfurization.Therefore, in fact, the desulfurization difficulty of mild steel is not high.And for carbon content≤ 0.002% ultra-low-carbon steel, its molten steel oxygen activity is higher, and ladle slag oxidizing is also higher, for the stabilization of process molten steel sulphur Control difficulty very big.Therefore, this method is not particularly suited for the production of super-low sulfur IF steel.
It is high low with desulfurized effect stabilization that the patent of invention of Application No. 201010567336.8 discloses a kind of desulfurization degree The desulfurizing and refining method of carbon steel, this method include tapping the molten steel after converter smelting into ladle, in tapping process successively Alloy is added in molten steel into ladle and desulfurization refining slag carries out molten steel alloying and desulfurization slag making, wherein, after the completion of tapping, Slag adjusting agent is added in the ladle slag formed into ladle.This method can effectively remove the oxygen in molten steel, reduce the oxygen of ladle slag The property changed, improve the performance and composition of ladle slag, greatly improve the desulfurization degree of molten steel.But this method is proprietary to be directed to dexidized steel, and Carbon content be 0.03~0.08% mild steel refining process depth sulfur removal technology, because carbon content is higher, its sulfur removal technology compared with It is relatively simple for ultra-low-carbon steel.
Application No. 200610047101.X patent of invention discloses a kind of deep desulfurizer for refining ultra-low-carbon steel And manufacture method, the desulfurizing agent composition include：CaO：60~69%, Al：11~20%, MgO：5~10%, SiO2：5~ 10%, Al2O3：1~5%, Fe2O3：0.5~1.2%, CaF2：1~3%, B2O3：1~3%, BaO：1~3%, remaining is miscellaneous Matter.The desulfurizing agent is mainly used in ultra-low-carbon steel depth desulfurization, and desulfurized effect is preferable, S in steel can be taken off in terms of embodiment to less than 0.001%, but its complicated component, and in terms of embodiment, the technology is applied to no doubt take off sulphur to relatively low on ultra-low-carbon steel Level, but add before and after desulfurizing agent, carbon content of molten steel increases 0.0024% by 0.0017%, and amplification is larger, is unfavorable for surpassing The production of mild steel.
[O] decarburization in steel is utilized in vacuum process due to ultra-low-carbon steels such as IF, therefore such steel grade is in converter In tapping process substantially will not deoxidation, thus cause the steel grade molten steel [O] and ladle slag oxidizing higher, ladle slag is not de- Sulphur ability, liquid steel refining process can also have certain time sulphur.Therefore metallargist both domestic and external is used in vacuum decarburization knot Beam, the ultra-low-carbon steel of super-low sulfur is produced to the method for vacuum chamber penetrating desulfurization powder.Such as Application No. 201110211400.3 Patent of invention disclose a kind of high-phosphorus low-sulfur non-oriented electrical steel and its smelting process, this method is by RH alloying knots The method that Shu Houxiang vacuum chambers add desulfurizing agent in batches, to realize the production of low-sulfur low-carbon steel steel.This method will extend vacuum More than processing time 5min, has a strong impact on rhythm of production；The addition of desulfurizing agent will greatly increase STEELMAKING PRODUCTION cost simultaneously, cause Product cost increase.
The content of the invention
Present invention solves the technical problem that it is to provide the production method of super-low sulfur IF steel.
The production method of super-low sulfur IF steel of the present invention, successively including molten iron pretreatment, converter smelting, LF refining and RH essences Refining, wherein, in the converter smelting, steel scrap is added, the steel scrap is without using slag steel, using the low-sulfur of sulfur content≤0.015% Clean steel scrap；Before smelting super-low sulfur IF steel during the sulfur content ＞ 0.020% of one heat steel, slag is not splashed, whole clinker is all outwelled；
During the LF refining, molten steel reaches processing position, adds active lime 3~5kg/t steel, argon bottom-blowing, argon flow amount For 500~1000NL/min, heat temperature raising stirs 10~20min, and it is 7~12% to make FeO contents in slag, at the end of LF refining, 1~3kg/t the steel of slag adjusting agent containing aluminium is added, then soft blow argon at least 3min；
During RH refining, before IF steel is produced, with sulfur content ＜ 0.010%, carbon content ＜ 0.05% molten steel to true Empty room carries out prepurging；It is 530~800mm that RH refinings, which are initially inserted into pipe immersion depth,；After RH refinings terminate, 1~2kg/t steel is added Slag adjusting agent containing aluminium, make the ladle slag oxidizing ＜ 6% after residue adjustment.
Further, in LF refining and RH refinings, the slag adjusting agent containing aluminium is made up of the component of following parts by weight：Al2O3： 20~40%, CaO：20~40%, Al：10~18%, MgO：5~10%, FeO ＜ 3%, P ＜ 0.10%, S ＜ 0.15%, its Remaining is impurity.
Wherein, in the converter smelting, enter stove half steel and meet following condition：1280 DEG C of temperature ＞, carbon content >=3.5%, Sulfur content≤0.003%；When converter starts, steel scrap is added, without using carburant temperature raising；
Converter terminal Slag modification method is：Converter terminal goes out after 3~5kg/t steel dolomitic lime processing 2min is added into stove Steel, it is ensured that 400~600mm of Steel ladle clearance；Finishing blowing extremely tapping bottom blowing strong mixing 1~2min, single brick flow 100Nm3/h；
The carbon content for controlling converter terminal is 0.04%~0.06%, sulfur content≤0.004%, and terminal oxygen activity is 0.05 ~0.08%, finishing slag TFe content are 16~20%；Tapping process adds active lime 2~4kg/t steel, and converter is controlled after tapping The lower quantity of slag, make ladle slag thickness≤100mm.
Further, RH decarburizations initial oxygen and carbon meet below equation：[O] >=[C] × 4/3+150, [O] is first in formula Beginning oxygen content, [C] are initial carbon content, and the unit of [O] and [C] is ppm；At the end of RH decarburizations oxygen activity be 0.02~ 0.03%, carbon content≤0.002%；It is 15~18min to control decarburization time of the vacuum less than 3mbar.
Further, 1300 DEG C of molten iron temperature ＞ before the molten iron pretreatment, carbon content >=4.5%, sulfur content≤ 0.06%.
Further, in the super-low sulfur IF steel, sulfur content≤0.004%, carbon content≤0.002%.
The method of the present invention is different from the production method of traditional super-low sulfur ultra-low-carbon steel, is to use molten iron and converter desulfurization Afterwards, refining process strictly controls the technical measures that ladle slag returns sulphur and molten steel increases sulphur using correlation technique.It the method reduce RH desulfurization process, production cost was not only reduced but also had saved the time.
The present invention reduces Ultra-low carbon, low-sulfur steel production cost, endangers small to environment and equipment and be easy to grasp from flow direct motion Make and large-scale production angle is set out, it is proposed that a kind of super-low sulfur that molten iron pretreatment-converter-LF-RH refining desulfurations are combined, Ultra low carbon IF steel production technology, finished product [S]≤0.004%, the steady production of [C]≤0.002% can be achieved, and RH terminates ladle Slag oxidizing has obtained preferable control, is advantageous to prevent casting process secondary oxidation of steel, improves Cleanliness of Molten Steel.In the party The desulfurization of molten iron pretreatment and converter is taken full advantage of in method, sulphur ability is controlled and terminates since converter tapping to RH refinings, Modifying process progressively is carried out to ladle slag, prevents process from returning sulphur, but not molten steel oxygen activity is greatly lowered, is ensureing control sulphur Meanwhile provide necessary condition for RH depth decarburizations.The technical operation is simple, will not increase activity time, while cost is low.
The inventive method is combined by using molten iron pretreatment desulfurizing, converter desulfurization with LF refining, RH refining desulfurations Technique, molten iron pretreatment beginning is terminated desulfurization degree to LF and reach more than 93%, and pass through converter terminal carbon, temperature, oxygen activity The technology measure such as control and the control of LF, RH procedure parameter, without being individually added into desulfurizing agent, realizes super-low sulfur, ultralow The production of sulphur IF steel.By the integrated application of the inventive method, realize finished product [C]≤0.002%, [S]≤0.004% it is super Low-sulfur IF steel produces.This method is simple, easy to operate, and production cost is low, is suitable for producing greatly.
Embodiment
The production method of super-low sulfur IF steel of the present invention, successively including molten iron pretreatment, converter smelting, LF refining and RH essences Refining, wherein, in the converter smelting, steel scrap is added, the steel scrap is without using slag steel, using the low-sulfur of sulfur content≤0.015% Clean steel scrap；Before smelting IF steel during the sulfur content ＞ 0.020% of one heat steel, slag is not splashed, whole clinker is all outwelled.
During the LF refining, molten steel reaches processing position, adds active lime 3~5kg/t steel, ladle bottom blowing argon gas, argon gas Flow is 500~1000NL/min, and heat temperature raising stirs 10~20min, and by FeO controls in slag 7~12%, LF refining terminates When, the 1~3kg/t steel of slag adjusting agent containing aluminium is added to the ladle top of the slag, then soft blow argon at least 3min, may be controlled to 5~7min, with Ensure that the fusing of slag adjusting agent containing aluminium is uniform, spread over ladle surface.
During the RH refinings, in order to reduce the sulphur and carbon content in finished product, the IF steel of low-sulfur is obtained, before IF steel is produced, Prepurging is carried out to vacuum chamber with [S] ＜ 0.010%, [C] ＜ 0.05% molten steel；RH refinings are initially inserted into pipe immersion depth and are After 530~800mm, RH refining terminate, 200~400kg slag adjusting agents containing aluminium are added to ladle surface, same contain is incorporated as with LF Aluminium slag adjusting agent, make the ladle slag oxidizing ＜ 6% after residue adjustment.
Slag adjusting agent commonly used in the art at present typically has 2 kinds, and a kind of is metal aluminum content ＜ 10% common slag adjusting agent；One Kind is greater than 30% high alumina slag adjusting agent.Common slag adjusting agent is because aluminium content is low, and residue adjustment effect is poor, and dosage is big；And high alumina residue adjustment The residue adjustment effect of agent is high, but because aluminium content is high, aluminium when molten steel stirs in slag adjusting agent can react with [O] in steel Cause the oxygen in steel to be removed, cause vacuum decarburization hypoxgia.To overcome drawbacks described above, the producer of super-low sulfur IF steel of the present invention Method, in LF refining and RH refinings, slag adjusting agent used is made up of the component of following parts by weight：Al2O3：20~40%, CaO：20 ~40%, Al：10~18%, MgO：5~10%, FeO ＜ 3%, P ＜ 0.10%, S ＜ 0.15%, remaining is impurity.
Further, in the converter smelting, enter stove half steel and meet following condition：1280 DEG C of temperature ＞, [C] >=3.5%, [S]≤0.003%；When converter starts, steel scrap is added, without using carburant temperature raising.
Converter terminal Slag modification method is：Converter terminal adds 3~5kg/t steel dolomitic lime and 1.5~2.5kg/t into stove Steel modification agent, dry slag are tapped after handling 2min, it is ensured that 400~600mm of Steel ladle clearance；Finishing blowing extremely tapping bottom blowing strong mixing 1 ~2min, single brick flow 100Nm3/h。
Converter terminal controls：[C] is 0.04%~0.06%, [S]≤0.004%, terminal oxygen activity 0.05~0.08%, Finishing slag TFe is 16~20%；Tapping process adds active lime 2~4kg/t steel, and the quantity of slag under converter is controlled after tapping, makes ladle Slag thickness≤100mm.
Heretofore described dolomitic lime and active lime is the conventional auxiliary material in steelmaking process, and active lime is main Containing CaO, its content is not less than 88wt%.Dolomitic lime is mainly 35~45%, MgO mass containing CaO and MgO, CaO mass fraction Fraction is 35~55%.
Further, RH decarburizations initial oxygen and carbon meet below equation：[O] >=[C] × 4/3+150, [O] is first in formula Beginning oxygen content, [C] are initial carbon content, and the unit of [O] and [C] is ppm；At the end of RH decarburizations oxygen activity be 0.02~ 0.03%, carbon content≤0.002%；It is 15~18min to control decarburization time of the vacuum less than 3mbar.
Wherein, during the RH refinings, if decarburization initial oxygen and carbon content are unsatisfactory for the formula, pressure decarburization is carried out, It is set to meet the formula.The pressure decarbonization method can use the existing method in this area, can also use following methods：During oxygen blast Between start (6~8) min, 440~480cm of rifle position for VCD, flow is 2400~2800m3/ h, [O] meets above-mentioned RH after oxygen blast Enter the station [C], [O] concentration requirement, but to prevent Molten Steel over-oxidation, and [O] is by lower limit consideration during oxygen blast.
In the production method of super-low sulfur IF steel of the present invention, 1300 DEG C of molten iron temperature ＞ before the molten iron pretreatment, [C] >= 4.5%, [S]≤0.06%；
In super-low sulfur IF steel of the present invention, [S]≤0.004%, [C]≤0.002%.
[S] in the present invention is sulfur content, and [C] is carbon content, and unless otherwise instructed, the percentage sign in the present invention is matter Measure percentage.
In the production process of the present invention, for strict control carbon content, whole process uses carbon-free ladle.
The method of the present invention is different from the production method of traditional super-low sulfur ultra-low-carbon steel, is to use molten iron and converter desulfurization Afterwards, refining process strictly controls the technical measures that ladle slag returns sulphur and molten steel increases sulphur using correlation technique.It the method reduce RH desulfurization process, production cost was not only reduced but also had saved the time.
The embodiment of the present invention is further described with reference to embodiment, therefore not limited the present invention System is among described scope of embodiments.
Embodiment 1
Super-low sulfur IF steel is produced using following methods.
(1) molten iron pre-processes
Molten iron before pretreatment meets following condition：1300 DEG C, C >=4.5% of molten iron temperature ＞, S≤0.06%.
(2) converter smelting
Enter converter half steel condition：Enter stove half steel carbon >=3.5%, 1280 DEG C of temperature ＞, S≤0.003%.Charge weight 220~ 230 tons.Steel scrap cleans steel scrap amount≤8 ton without using slag steel using low-sulfur (S≤0.015%).Without using carburant temperature raising.Blow Refining process whole process BOTTOM ARGON BLOWING.When smelting the previous stove sulfur content ＞ 0.020% of IF steel, slag is not splashed, whole clinker is all outwelled.It is specifically shown in Table 1.
The converter of table 1 enters fire bars part
Smelting number Steel grade Charge weight/t Temperature/DEG C Add steel scrap/t [C]/% [S]/%
1 IF3 225 1285 0 3.52 0.0030
2 IF3 228 1287 3 3.63 0.0029
3 IF3 230 1290 6 3.55 0.0026
4 IF3 225 1292 2 3.58 0.0029
Converter terminal residue adjustment requirement：Converter terminal adds 3~5kg/t steel dolomitic lime and 1.5~2.5kg/t steel into stove Tapped after modification agent dry slag processing 2min, it is ensured that 400~600mm of Steel ladle clearance.Finishing blowing extremely tapping bottom blowing strong mixing, single brick Flow 100Nm3/h, 1~2min.Specifically it is shown in Table 2.
The converter terminal residue adjustment of table 2 requirement
Converter terminal controls：[C] is 0.04%~0.06%, [S]≤0.004%, terminal oxygen activity 0.05~0.08%, Finishing slag TFe is controlled 16~20%.Slag modification requires in tank after tapping：Tapping process adds active lime 2-4kg/t steel, tapping The quantity of slag under converter is controlled afterwards, makes ladle slag thickness≤100mm.Specifically it is shown in Table 3.
Slag modification requires in tank after the converter terminal of table 3 is controlled and tapped
(3) LF refining
LF refining starts：Molten steel reaches processing position, adds active lime 3~5kg/t steel.Ladle bottom blowing argon flow amount controls In 500~1000NL/min, heat temperature raising stirs 10~20min, by FeO controls in slag 7~12%.
LF refining terminates：Molten steel slag adjusting agent 1~3kg/t steel is added to the ladle top of the slag, soft blow argon >=3min after addition, is ensured Slag adjusting agent fusing is uniform, spreads over ladle surface.
Wherein slag adjusting agent main component is：Al2O3：20~40%, CaO：20~40%, MAl：10~18%, MgO：5~ 10%, FeO ＜ 3%, P ＜ 0.10%, S ＜ 0.15%, remaining is impurity.
LF refining parameter is shown in Table 4 corresponding to each Smelting number.
The LF process control of table 4
(4) RH is refined
Before producing IF steel, prepurging is carried out to vacuum chamber with [S] ＜ 0.010%, [C] ＜ 0.05% high-temperature molten steel.
RH refinings start molten steel condition：Insertion tube immersion depth is controlled between 530~800mm, is started application of vacuum, is opened Open vacuum main valve.
RH carbonization treatments：Initial (the ppm) × 4/3+150 of [O] initial (ppm) >=[C].If [O] initial (ppm) deficiency, Carry out pressure decarburization, control decarburization terminates a [O] 0.02~0.03%, decarburization target C：≤20ppm.
Vacuum is less than 3mbar deep decarburization time (15~20) min.
RH refines residue adjustment：After RH refinings terminate, 200~400kg slag adjusting agents are added to ladle surface, are added with LF refining For same slag adjusting agent, pass through the ladle slag oxidizing ＜ 6% after residue adjustment.
LF refining parameter is shown in Table 5 corresponding to each Smelting number.Wherein, Smelting number 2 and 4 needs to carry out pressure decarburization.
The RH process control of table 5
The control of sulfur content is shown in Table 6 in whole steelmaking process.
Sulfur content controls % in the process steel of table 6
Molten iron pretreatment starts Converter enters stove Converter terminal LF is outbound RH is outbound Finished product
0.055 0.0024 0.0021 0.0019 0.002 0.0021
0.060 0.0028 0.0023 0.0023 0.0024 0.0024
0.051 0.0030 0.0043 0.0036 0.0038 0.0037
0.053 0.0026 0.0050 0.0046 0.0037 0.0036
From table 6, by effective control of converter smelting and LF, RH refining process, finished product sulfur content has obtained effectively Ground controls, and is successfully realized the production of super-low sulfur, ultra low carbon IF steel.

Claims (9)

1. the production method of super-low sulfur IF steel, refined successively including molten iron pretreatment, converter smelting, LF refining and RH, its feature It is：
During the converter smelting, steel scrap is added, the steel scrap cleans steel scrap using the low-sulfur of sulfur content≤0.015%；Smelt super Before low-sulfur IF steel during the sulfur content ＞ 0.020% of one heat steel, slag is not splashed, whole clinker is all outwelled；
During the LF refining, molten steel reaches processing position, adds active lime 3~5kg/t steel, argon bottom-blowing, argon flow amount 500 ~1000NL/min, heat temperature raising stir 10~20min, and it is 7~12% to make FeO contents in slag, and at the end of LF refining, addition contains Aluminium slag adjusting agent 1~3kg/t steel, then soft blow argon at least 3min；
During RH refining, before IF steel is produced, with sulfur content ＜ 0.010%, carbon content ＜ 0.05% molten steel to vacuum chamber Carry out prepurging；It is 530~800mm that RH refinings, which are initially inserted into pipe immersion depth,；After RH refinings terminate, add 1~2kg/t steel and contain aluminium Slag adjusting agent, make the ladle slag oxidizing ＜ 6% after residue adjustment；
RH decarburizations initial oxygen and carbon meet below equation：[O] >=[C] × 4/3+150, [O] is initial oxygen content in formula, [C] For initial carbon content, the unit of [O] and [C] is ppm；Oxygen activity is 0.02~0.03% at the end of RH decarburizations, carbon content≤ 0.002%；It is 15~18min to control decarburization time of the vacuum less than 3mbar.
2. the production method of super-low sulfur IF steel according to claim 1, it is characterised in that：In LF refining and RH refinings, institute Slag adjusting agent containing aluminium is stated to be made up of the component of following parts by weight：Al2O3：20~40%, CaO：20~40%, Al：10~18%, MgO：5~10%, FeO ＜ 3%, P ＜ 0.10%, S ＜ 0.15%, remaining is impurity.
3. the production method of super-low sulfur IF steel according to claim 1 or 2, it is characterised in that：In the converter smelting, enter Stove half steel meets following condition：1280 DEG C of temperature ＞, carbon content >=3.5%, sulfur content≤0.003%；When converter starts, add Steel scrap, without using carburant temperature raising；
Converter terminal Slag modification method is：Converter terminal is tapped after 3~5kg/t steel dolomitic lime processing 2min is added into stove, really Protect 400~600mm of Steel ladle clearance；Finishing blowing extremely tapping bottom blowing strong mixing 1~2min, single brick flow 100Nm3/h；
Control converter terminal carbon content be 0.04%~0.06%, sulfur content≤0.004%, terminal oxygen activity be 0.05~ 0.08%, finishing slag TFe content are 16~20%；Tapping process adds active lime 2~4kg/t steel, is controlled after tapping under converter The quantity of slag, make ladle slag thickness≤100mm.
4. the production method of super-low sulfur IF steel according to claim 1 or 2, it is characterised in that：Before the molten iron pretreatment 1300 DEG C of molten iron temperature ＞, carbon content >=4.5%, sulfur content≤0.06%.
5. the production method of super-low sulfur IF steel according to claim 3, it is characterised in that：Iron before the molten iron pretreatment 1300 DEG C of coolant-temperature gage ＞, carbon content >=4.5%, sulfur content≤0.06%.
6. the production method of super-low sulfur IF steel according to claim 1 or 2, it is characterised in that：In the super-low sulfur IF steel, Sulfur content≤0.004%, carbon content≤0.002%.
7. the production method of super-low sulfur IF steel according to claim 3, it is characterised in that：In the super-low sulfur IF steel, sulphur Content≤0.004%, carbon content≤0.002%.
8. the production method of super-low sulfur IF steel according to claim 4, it is characterised in that：In the super-low sulfur IF steel, sulphur Content≤0.004%, carbon content≤0.002%.
9. the production method of super-low sulfur IF steel according to claim 5, it is characterised in that：In the super-low sulfur IF steel, sulphur Content≤0.004%, carbon content≤0.002%.
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