CN103205524A - Method for smelting low-sulfur steel from semi-steel - Google Patents
Method for smelting low-sulfur steel from semi-steel Download PDFInfo
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Abstract
The invention provides a method for smelting low-sulfur steel from semi-steel. The method comprises the following steps of: guiding liquid iron into a vanadium extracting converter for blowing so as to form semi-steel; tapping the semi-steel to a steel ladle and adding silicon-iron alloy to the steel ladle in the semi-steel tapping process so as to increase the content of silicon in liquid steel; guiding the liquid steel into the converter and adding a slagging material to the converter for smelting; discharging sulfur enriched slag in the converter, adding high-magnesium lime to the steel ladle by an quantity of 5-7 kg/t of steel to blend with the liquid steel in the process of tapping steel to the steel ladle, and adding a slag regulating agent to the slag surface of the steel ladle after steel tapping is finished; performing argon refining on the liquid steel; performing desulfurization refining on the liquid steel in a steel ladle refining furnace; performing calcium treatment on the liquid steel in such a manner of feeding a calcium alloy line to the liquid steel; and performing liquid steel casting through a continuous casting process and obtaining a casting blank having the sulfur content not higher than 0.010wt%. With the method provided by the invention, the problems of iron loss caused by desulfurization drossing, insufficient semi-steel smelting heat source and the like in smelting of low-sulfur steel from semi-steel are effectively solved; and the desulfurization effect is excellent.
Description
Technical field
The present invention relates to steelmaking technical field, more particularly, relate to a kind of method that adopts the later half smelting steel low-sulfur steel of vanadium extraction.
Background technology
Concerning most of steel grades, sulphur is harmful element, and it is hot-short that steel is produced, and also can form sulfide inclusion the mechanical property of steel is had a negative impact.Therefore, sulphur content is the vital task of STEELMAKING PRODUCTION in the reduction molten steel.
Traditional molten iron smelting low-sulfur steel technical process is mainly: the refining → continuous casting of desulfurizing iron → skim → converter → LF(RH); And when using the v-ti magnetite ore resources to smelt, the main raw material of converter steelmaking is through the half steel behind the special-purpose vanadium extraction by converter blowing, adopts the technical process of half steel smelting low-sulfur steel to be mainly: the refining → continuous casting of desulfurizing iron → skim → vanadium extraction → converter smelting → LF(RH).Through the molten steel sulfur content behind the blast-furnace smelting generally between 0.04wt%～0.08wt%, but owing to contain elements such as vanadium, titanium, molten iron viscosity is big, and in the molten iron slag because containing oxide compounds such as vanadium, titanium, molten iron slag viscosity is also big, sorbent consumption was big when this caused pretreatment desulfurizing, the desulfurization slag difficulty is separated with molten iron, all iron content height in the slag when skimming, iron loss is bigger, the steel-making cost height.Simultaneously, carbonaceous amount percentage composition is 3.4%～4.0% in the half steel that vanadium-bearing hot metal obtains after the desulfurization vanadium extraction, silicon, manganese heating slagging constituent content are vestige in the half steel, therefore, semi-steel making has that acid slagging material is few in the converting process, the slag system constituent element is single and characteristics such as shortage of heat, it is long to cause under the semi-steel making condition forming initial stage slag required time, and dephosphorization, desulfurization degree are low.As seen, compare with common molten iron-steelmaking, employing half steel smelting low-sulfur steel is more difficult, iron loss is bigger, and smelting cost is higher.
Publication number is that the Chinese patent application of CN102605239A discloses a kind of low-sulfur steel and production method thereof, and its technical process is: hot metal pretreatment → combined blown converter smelting → converter tapping wash heat → refining → Ca processing → sheet billet continuous casting → hot rolling.Can be with the control of finished product molten steel sulphur content in 0.002% by this technical process.The production of low-sulfur steel at first needs to carry out hot metal pretreatment and takes out desulfurization slag in this patent, and the process of skimming iron loss is bigger, and production cost is higher; Secondly, do not tell about the concrete measure of control converter smelting and refining process sulphur content in detail, and this method is applicable to common molten steel, and for describing whether being applicable to half steel.
Summary of the invention
At the deficiencies in the prior art, one of purpose of the present invention is to solve the one or more problems that exist in the above-mentioned prior art.The invention provides a kind of method of half steel smelting low-sulfur steel, use the present invention can effectively solve half steel and smelt heat source insufficiency, the problem that the desulphurization and slag skimming iron loss is big, sweetening effectiveness is good, and is simple to operate, and cost is low.
To achieve these goals, the invention provides a kind of method of half steel smelting low-sulfur steel.Said method comprising the steps of: directly molten iron is blended into converter extracting vanadium and blows to form half steel; Half steel is tapped in the ladle, and in going out the half steel process, in ladle, add ferro-silicon to increase the silicone content in the molten steel; Molten steel is blended into converter, adds slag making materials then in the converter and smelt; Outwell the rich sulphur slag in the converter stove, mix with molten steel at the high magnesium lime from 5～7Kg/t steel to ladle that add of tapping to the process of ladle and dash, and after tapping finishes, add slag supplying agent to the ladle top of the slag; Molten steel is carried out ar blowing refining; Molten steel is carried out desulfurizing and refining at ladle refining furnace; In the mode of feeding the calcium alloy line to molten steel molten steel being carried out calcium handles; Adopt continuous casting process to carry out pouring molten steel and obtain the strand that sulphur content is not higher than 0.010wt%.
According to an embodiment of the method for half steel smelting low-sulfur steel of the present invention, in the step in described ladle that half steel is tapped, when reach in tap converter extracting vanadium molten steel total amount 1/3 the time, in ladle, add ferro-silicon.
According to an embodiment of the method for half steel smelting low-sulfur steel of the present invention, can contain the silicon of 70～85wt% in the described ferro-silicon, its add-on is 2～4Kg/t steel.
According to an embodiment of the method for half steel smelting low-sulfur steel of the present invention, described slag making materials can comprise the quickened lime of 50～65Kg/t steel, the high magnesium lime of 25～30Kg/t steel and the slag former of 15～25Kg/t steel.
An embodiment according to the method for half steel smelting low-sulfur steel of the present invention, described method can also be included in after the described step of outwelling rich sulphur slag in the stove, before the converter tapping, the high magnesium lime that adds 3～5Kg/t steel in the converter carries out dry slag, the following quantity of slag when reducing tapping.
According to an embodiment of the method for half steel smelting low-sulfur steel of the present invention, the add-on of described slag supplying agent can be 3～5Kg/t steel, and described slag supplying agent can comprise 15～25% Al by weight percentage
2O
3, 35～45% CaO, 5～15% SiO
2, 10～15% metal A l, and surplus unavoidable impurities.
According to an embodiment of the method for half steel smelting low-sulfur steel of the present invention, the described Argon intensity that molten steel is carried out in the ar blowing refining step can be 0.003～0.005m
3/ (mint steel), and argon blowing time can be 5～8 minutes.
An embodiment according to the method for half steel smelting low-sulfur steel of the present invention, described molten steel is carried out in the step of desulfurizing and refining at ladle refining furnace, after can adding the whipping agent of the aluminum shot of fluorite, 0.3～0.6Kg/t steel of quickened lime, 0.5～1Kg/t steel of 2.5～5Kg/t steel and 5～6Kg/t steel in the ladle, beginning adds heat refining for the first time; Wherein, the composition of described whipping agent can contain CaO:45～60%, CaF by weight percentage
2: 5～10%, burning decrement: 25～35%, gas forming amount is not less than 45L/Kg; Add in the described first time and to adopt first bottom blowing gas intensity to stir in the process of heat refining, described first bottom blowing gas intensity is 0.003～0.005m
3/ (mint
Steel), adding and stop heating behind heat refining 12～15min, and improve air supply intensity to the second bottom blowing gas intensity and stir 3～5min, described second bottom blowing gas intensity is 0.005～0.01m
3/ (mint
Steel); Add the quickened lime of 2～4Kg/t steel, the fluorite of 0.5～0.8Kg/t steel and the aluminum shot of 0.3～0.5Kg/t steel in the ladle again and carry out adding the second time heat refining, add in the described second time and to adopt described first bottom blowing gas intensity to stir in the process of heat refining, stop heating behind refining 8～10min; Then, finish refining after adopting described second air supply intensity to stir 3～5min.
An embodiment according to the method for half steel smelting low-sulfur steel of the present invention, describedly in the mode of feeding the calcium alloy line to molten steel molten steel is carried out the step that calcium handles and can comprise: the amount with 2～3m/t steel feeds molten steel with silicon-calcium wire, line feeding speed is 3～5m/s, and the ladle bottom blowing air supply intensity is 0.0015～0.0025m during line feeding
3/ (mint steel), described silicon-calcium wire comprises following component by weight percentage: 32%～38% Ca, 40%～50% Si, 10%～15% Fe, all the other are unavoidable impurities.
According to an embodiment of the method for half steel smelting low-sulfur steel of the present invention, described method can also comprise that calcium handles back soft blow argon 3～8min, and Argon intensity is 0.001～0.002m
3/ (mint steel).
Compared with prior art, beneficial effect of the present invention comprises: molten iron need not carry out pretreatment desulfurizing, desulfurization energy consumption and the iron loss of skimming have been avoided, when having improved vanadium extraction terminal point (half steel) carbon content and temperature and having gone out half steel half steel is increased silicon, for good condition has been created in the converter desulfurization, and in converter, adopt the big quantity of slag to smelt, finally can be with the control of finished product molten steel sulphur content in 0.010wt% by measures such as tapping residue adjustment, LF stove desulfurizing and refining, Ca processing.
Embodiment
Hereinafter, will describe method according to half steel smelting low-sulfur steel of the present invention in detail in conjunction with exemplary embodiment.In the present invention, if there is not the statement of exception, the content of each element or composition all is weight percentage (with " wt% " expression) in the material of then mentioning usually.
The method of half steel smelting low-sulfur steel can may further comprise the steps according to an exemplary embodiment of the present invention: directly molten iron is blended into converter extracting vanadium and blows to form half steel; Half steel is tapped in the ladle, and in going out the half steel process, in ladle, add the ferro-silicon of 2～4Kg/t steel to increase the silicone content in the molten steel; Molten steel is blended into converter, adds slag making materials then in the converter and smelt; Outwell the rich sulphur slag in the converter stove, mix with molten steel at the high magnesium lime from 5～7Kg/t steel to ladle that add of tapping to the process of ladle and dash, and after tapping finishes, add slag supplying agent to the ladle top of the slag; Molten steel is carried out ar blowing refining; Molten steel is carried out desulfurizing and refining at ladle refining furnace; In the mode of feeding calcium alloy line (for example, silicon-calcium wire, solid calcium line, calcium aluminum steel etc.) to molten steel molten steel being carried out calcium handles; Adopt continuous casting process to carry out pouring molten steel and obtain the strand that sulphur content is not higher than 0.010wt%.
The technological process of production of the method for above-mentioned exemplary embodiment is: vanadium extraction from hot metal → go out half steel increases silicon → converter smelting → tapping residue adjustment → LF stove (ladle furnace) refining → Ca processing → continuous casting.This method reduces the molten iron pretreatment desulfurizing operation, has avoided desulfurization energy consumption and the iron loss of skimming, and has improved vanadium extraction terminal point (half steel) carbon and temperature.
Increase silicon when going out half steel, the purpose that increases silicon is the content that increases heating element silicon in the half steel, comes slag fast early stage to improve smelting initial stage half steel temperature and to promote to smelt, for good condition has been created in the converter desulfurization.Wherein, described ferro-silicon is steel-making alloy or reductor commonly used, usually, when tapping, steel-making converter adds ladle as alloy or reductor, and the present invention adds opportunity by changing it in the half steel smelting process, when half steel is tapped, just it is added in the ladle, make it become a kind of temperature raising material.When wherein silicone content was 70～85wt%, its add-on was 2～4Kg/t steel for best, cross senior general as add-on to make the half steel silicone content higher, thus supplementary product onsumption when increasing converter smelting greatly; It is not obvious to increase silicon as the too small then half steel of add-on, can not play the purpose of replenishing converter smelting thermal source in early stage.Preferably, in the described process that goes out half steel, when reach in tap converter extracting vanadium molten steel total amount 1/3 the time, in ladle, add ferro-silicon, if it is too early that ferro-silicon adds, will cause a large amount of alloys to be deposited in ladle bottom, in the ladle operational process, there is the danger of blasting; If ferro-silicon adds too late, it is too much that half steel is housed in the ladle of half steel, half steel seethes and easily makes half steel overflow ladle behind the adding ferrosilicon, cause metal loss and security incident, and the joining day crosses the late tapping end back alloy that will cause can not melt fully, influence increases the silicon effect, influences converter and normally smelts.
In converter, adopt big quantity of slag desulfurization, can further improve the converter desulfurization degree, particularly, the add-on of quickened lime can be 50～65Kg/t steel during converter slag-making, the add-on of high magnesium lime is 25～30Kg/t steel, add-on 15～25Kg/t steel of slag former, described quickened lime, high magnesium lime and slag former are steel-making slag making materials commonly used.Finally can be with the control of finished product molten steel sulphur content in 0.010% by measures such as tapping residue adjustment, LF stove desulfurizing and refining, Ca processing.
In addition, dash with molten steel is mixed at the high magnesium lime that adds 5～7Kg/t steel to ladle of tapping to the process of ladle.Here, if the high magnesium lime add-on will make that too much the tapping process temperature drop is big, and very easily show at ladle and be piled into " stone roller ", be difficult to thawing, cross the purpose that does not have raising ladle slag basicity at least, the too much or very few best effect that does not all reach preliminary refining of add-on as add-on.Mixing the purpose of dashing mainly is in order to improve its melting rate, to improve the preliminary refining effect.
In one exemplary embodiment of the present invention, the method of half steel smelting low-sulfur steel also comprises on the basis of the method for above-mentioned exemplary embodiment, in outwelling stove after the step of rich sulphur slag, before the converter tapping, look the high magnesium lime that the slag situation adds 3～5Kg/t steel in the converter and carry out dry slag, the following quantity of slag when reducing tapping.If the very few purpose that does not have dry slag of high magnesium lime add-on, add-on is excessive then to increase smelting cost, and is unfavorable for spattering slag operation, and add-on is that 3～5Kg/t steel is the most suitable.
In one exemplary embodiment of the present invention, the method for described half steel smelting low-sulfur steel can realize by following steps:
⑴, molten iron directly is blended into converter extracting vanadium carries out vanadium extraction and blow to form half steel.And in the half steel tapping process, increase silicon, and specific requirement is, reaches 1/3 o'clock of converter extracting vanadium molten steel total amount in tap, ferro-silicon in the half steel jar, and its add-on is 2～4Kg/t steel, contains the silicon of 70～85wt% in the described ferro-silicon.
⑵, molten steel is blended into converter, add slag making materials then in the converter and carry out desulfurization and smelt, wherein, slag making materials can adopt steel-making slag making materials commonly used, for example, quickened lime, high magnesium lime and slag former, the add-on in the existing smelting process of the add-on of slag making materials is big, particularly, the adding total amount of quickened lime is 50～65Kg/t steel, and the adding total amount of high magnesium lime is 25～30Kg/t steel, adding total amount 15～25Kg/t steel of slag former.
⑶, outwell rich sulphur slag in the converter stove before tapping, deslagging backsight slag situation adds t steel 3～5Kg high magnesium lime dry slag.Mix with molten steel and dash at tap to the process of ladle high magnesium lime from 5～7Kg/t steel to ladle that add of converter molten steel, and after tapping finishes, add slag supplying agent to the ladle top of the slag.The add-on of described slag supplying agent can be 3～5Kg/t steel, and slag supplying agent comprises 15～25% Al by weight percentage
2O
3, 35～45% CaO, 5～15% SiO
2, 10～15% metal A l, and surplus unavoidable impurities.Described slag supplying agent mainly plays the purpose of preliminary refining, and wherein, 35～45% high CaO content is conducive to improve ladle slag basicity, and 10～15% metal A l can carry out pre-deoxidation to slag, and its acting in conjunction is conducive to refining desulfuration.If add-on is crossed senior general and made that the tapping process temperature drop is big, and be difficult for fusing, do not have the effect of preliminary refining, add-on is little then not obvious to the ladle slag composition influence, does not also have the effect of preliminary refining.
⑷, tapping finish the Argon station of back after converter molten steel are carried out ar blowing refining, and Argon intensity is 0.003～0.005m
3/ (mint steel), and argon blowing time is 5～8 minutes.
⑸, employing LF stove carry out liquid steel refining under the condition of BOTTOM ARGON BLOWING.Molten steel namely adds quickened lime, fluorite, aluminum shot and whipping agent in ladle behind LF stove refining station, wherein, the add-on of quickened lime is 2.5～5Kg/t steel, the add-on of fluorite is 0.5～1Kg/t steel, the add-on of aluminum shot is 0.3～0.6Kg/t steel, and the add-on of whipping agent is 5～6Kg/t steel.Add enough lime before the refining and can improve ladle slag basicity, the aluminum shot of 0.3～0.6Kg/t steel can be proceeded deoxidation to ladle slag simultaneously, more is conducive to desulfurization, and the adding of whipping agent and fluorite all is for promotion slag and submerged arc.Begin then for the first time to add heat refining, adopt first bottom blowing gas intensity to stir to promote desulfurization in adding the process of heat refining, first bottom blowing gas intensity is 0.003～0.005m
3/ (mint steel) adds and stops heating behind heat refining 12～15min, and improves air supply intensity to the second bottom blowing gas intensity and stir 3～5min, and described second bottom blowing gas intensity is 0.005～0.01m
3/ (mint
Steel).
Continuation adds quickened lime, fluorite and aluminum shot in the ladle and carries out adding the second time heat refining, wherein, the add-on of quickened lime is 2～4Kg/t steel, the aluminum shot add-on is 0.3～0.5Kg/t steel, the fluorite add-on is 0.5～0.8Kg/t steel, and the steel ladle bottom argon blowing air supply intensity is 0.003～0.005m in the process that adds for the second time heat refining
3/ (mint steel) stops heating behind refining 8～10min.
At last, adopt 0.005～0.01m
3/ (mint
Steel) air supply intensity finish refining after stirring 3～5min.
Described heating refining process adopts less air supply intensity (0.003～0.005m
3/ (mint
Steel)) purpose be in order to prevent that air supply intensity from crossing ambassador's molten steel and overflowing ladle influence and produce, to stop to heat the back and adopt strong air supply intensity (0.005～0.01m
3/ (mint
Steel)) purpose that stirs is in order to promote the stirring in the ladle furnace, to increase the desulfurization dynamic conditions, improving the refining desulfuration ability.
In the present invention, described aluminum shot is steel-making reductor commonly used, contains by weight percentage to be not less than 95% metallic aluminium, and the granularity of aluminum shot is 5～10mm.Described quickened lime, fluorite are steel-making auxiliary material commonly used, and by weight percentage, described quickened lime contains and is not less than 86% CaO, and described fluorite contains and is not less than 85% CaF
2The composition of described whipping agent contains CaO:45～60%, CaF by weight percentage
2: 5～10%, burning decrement: 25～35%, gas forming amount is not less than 45L/Kg.
⑹, the refining of LF stove finish the back molten steel are carried out the calcium processing, specifically, amount with 2～3m/t steel feeds molten steel with silicon-calcium wire, line feeding speed is 3～5m/s, if crossing, line feeding speed will cause activity time to increase slowly, the too fast then molten steel of line feeding speed seethes severity, and temperature drop is big, and the molten steel secondary oxidation is serious; The ladle bottom blowing air supply intensity is 0.0015～0.0025m during line feeding
3/ (mint steel), calcium and molten steel vigorous reaction make molten steel seethe severity in the calcium line, and should adopt low air supply intensity this moment, prevents that molten steel from overflowing ladle and reducing line feeding temperature losses of the process and molten steel secondary oxidation.Silicon-calcium wire comprises following component by weight percentage: 32%～38% Ca, and 40%～50% Si, 10%～15% Fe, all the other are unavoidable impurities.
⑺ after, calcium processing finish, can be to molten steel soft blow argon 3～8min, this moment, bottom blowing gas intensity was 0.001～0.002m
3/ (mint steel).Molten steel after the soft blow directly carries out continuous casting, finally obtains being not more than 0.01% finished product continuously cast bloom.The purpose of soft blow is in order to promote floating foreign in the molten steel, make the molten steel cleanliness factor higher that Argon intensity is 0.001～0.002m during soft blow
3/ (mint steel) more is conducive to inclusion floating.
In order to understand above-mentioned exemplary embodiment of the present invention better, below in conjunction with concrete example it is further specified.
Example 1
Certain factory's molten steel sulfur content is 0.065%, smelts the steel grade sulphur content and requires to be lower than 0.01%.Molten iron directly is blended into converter extracting vanadium carries out vanadium extraction, go out the half steel process and increase silicon to the ferrosilicon (silicone content 70%) that ladle adds the 2Kg/t steel.Increasing half steel behind the silicon directly is blended into steel-making converter and adds slag making materials and carry out steel desulfurization.The add-on of slag making materials is: the adding total amount of quickened lime is the 58Kg/t steel, and the adding total amount of high magnesium lime is the 30Kg/t steel, and the adding total amount 20Kg/t steel of slag former is outwelled rich sulphur slag in the stove before tapping, adds the high magnesium lime dry slag of 3Kg/t steel after the deslagging.
The high magnesium lime that tapping process adds the 6Kg/t steel in the ladle mixes with molten steel and dashes, and tapping finishes the slag supplying agent of back adding 4Kg/t steel on the ladle top of the slag.The slag supplying agent composition is 15% Al
2O
3, 35% CaO, 5% SiO
2, 12% metal A l and unavoidable impurities.Tapping finishes Argon station behind stove, back and adopts 0.003m
3The ladle bottom blowing air supply intensity of/(mint steel) is sent into molten steel the LF refining desulfuration after molten steel is carried out Argon stirring 5min again.
Molten steel namely adds quickened lime, fluorite, aluminum shot and whipping agent in the ladle behind the LF heating station and (contains CaO:50%, CaF
2: 8%, burning decrement: 30%, gas forming amount: 55L/Kg), the quickened lime add-on is the 4Kg/t steel, and the fluorite add-on is the 0.7Kg/t steel, and the aluminum shot add-on is the 0.5Kg/t steel, and the whipping agent add-on is the 5Kg/t steel.Begin to add heat refining after having added, the steel ladle bottom argon blowing air supply intensity is 0.003m during heating
3/ (mint steel), refining heating 13min stop heating and adopt big bottom blowing gas intensity to stir 3min, and this moment, bottom blowing gas intensity was 0.005m
3/ (mint steel).Continuation adds quickened lime, fluorite and aluminum shot in ladle, the add-on of quickened lime is the 3Kg/t steel, and the aluminum shot add-on is the 0.4Kg/t steel, and the fluorite add-on is the 0.6Kg/t steel, continues to add heat refining 9min, and the steel ladle bottom argon blowing air supply intensity is 0.004m during heating
3/ (mint steel).Heating finishes the back and adopts big air supply intensity to stir 4min, and this moment, bottom blowing gas intensity was 0.005m
3/ (mint steel), the LF refining finishes.
Carry out calcium after heating finishes and handle, the quantitative silicon-calcium wire (containing 32% Ca, 40% Si, 10% Fe and unavoidable impurities) of feeding 2m/t steel in the ladle, line feeding speed is 4m/s, the ladle bottom blowing air supply intensity is 0.002m during line feeding
3/ (mint steel).The calcium processing finishes back soft blow 5min, and this moment, bottom blowing gas intensity was 0.0015m
3/ (mint steel), the molten steel after the soft blow directly carries out continuous casting, and the sulphur content that finally obtains the finished product continuously cast bloom is 0.008%.
Example 2
Certain factory's molten steel sulfur content is 0.04%, smelts the steel grade sulphur content and requires to be lower than 0.01%.Molten iron directly is blended into converter extracting vanadium carries out vanadium extraction, go out in the half steel process ferrosilicon (silicone content 75%) that adds the 3Kg/t steel to ladle and increase silicon.Increasing half steel behind the silicon directly is blended into steel-making converter and adds slag making materials and carry out steel desulfurization.The add-on of slag making materials is: the adding total amount of quickened lime is the 50Kg/t steel, and the adding total amount of high magnesium lime is the 28Kg/t steel, and the adding total amount 15Kg/t steel of slag former is outwelled rich sulphur slag in the stove before tapping, adds the high magnesium lime dry slag of 5Kg/t steel after the deslagging.
The high magnesium lime that tapping process adds the 5Kg/t steel in the ladle mixes with molten steel and dashes, and tapping finishes the slag supplying agent of back adding 3Kg/t steel on the ladle top of the slag.The slag supplying agent composition is 20% Al
2O
3, 30% CaO, 10% SiO
2, 10% metal A l and unavoidable impurities.Tapping finishes Argon station behind stove, back and adopts 0.004m
3The ladle bottom blowing air supply intensity of/(mint steel) is sent into molten steel the LF refining desulfuration after molten steel is carried out Argon stirring 7min again.
Molten steel namely adds quickened lime, fluorite, aluminum shot and whipping agent in the ladle behind the LF heating station and (contains CaO:45%, CaF
2: 5%, burning decrement: 25%, gas forming amount: 48L/Kg), the quickened lime add-on is the 2.5Kg/t steel, and the fluorite add-on is the 0.5Kg/t steel, and the aluminum shot add-on is the 0.3Kg/t steel, and the whipping agent add-on is the 5.5Kg/t steel.Begin to add heat refining after having added, the steel ladle bottom argon blowing air supply intensity is 0.004m during heating
3/ (mint steel), refining heating 12min stop heating and adopt big bottom blowing gas intensity to stir 4min, and this moment, bottom blowing gas intensity was 0.007m
3/ (mint steel).Continuation adds quickened lime, fluorite and aluminum shot in ladle, the add-on of quickened lime is the 2Kg/t steel, and the aluminum shot add-on is the 0.3Kg/t steel, and the fluorite add-on is the 0.5Kg/t steel, continues to add heat refining 8min, and the steel ladle bottom argon blowing air supply intensity is 0.003m during heating
3/ (mint steel).Heating finishes the back and adopts big air supply intensity to stir 3min, and this moment, bottom blowing gas intensity was 0.005m
3/ (mint steel), the LF refining finishes.
Carry out calcium after heating finishes and handle, the quantitative silicon-calcium wire (containing 35% Ca, 45% Si, 12% Fe and unavoidable impurities) of feeding 3m/t steel in the ladle, line feeding speed is 3m/s, the ladle bottom blowing air supply intensity is 0.0015m during line feeding
3/ (mint steel).The calcium processing finishes back soft blow 3min, and this moment, bottom blowing gas intensity was 0.001m
3/ (mint steel), the molten steel after the soft blow directly carries out continuous casting, and finally obtaining finished product continuously cast bloom sulphur content is 0.007%.
Example 3
Certain factory's molten steel sulfur content is 0.08%, smelts the steel grade sulphur content and requires to be lower than 0.01%.Molten iron directly is blended into converter extracting vanadium carries out vanadium extraction, go out the half steel process and increase silicon to the ferrosilicon (silicone content 85%) that ladle adds the 4Kg/t steel.Increasing half steel behind the silicon directly is blended into steel-making converter and adds slag making materials and carry out steel desulfurization.The add-on of slag making materials is: the adding total amount of quickened lime is the 65Kg/t steel, and the adding total amount of high magnesium lime is the 25Kg/t steel, and the adding total amount 25Kg/t steel of slag former is outwelled rich sulphur slag in the stove before tapping, adds the high magnesium lime dry slag of 3Kg/t steel after the deslagging.
The high magnesium lime that tapping process adds the 4Kg/t steel in the ladle mixes with molten steel and dashes, and tapping finishes the slag supplying agent of back adding 5Kg/t steel on the ladle top of the slag.The slag supplying agent composition is 25% Al
2O
3, 45% CaO, 15% SiO
2, 15% metal A l and unavoidable impurities.Tapping finishes Argon station behind stove, back and adopts 0.005m
3The ladle bottom blowing air supply intensity of/(mint steel) is sent into molten steel the LF refining desulfuration after molten steel is carried out Argon stirring 8min again.
Molten steel namely adds quickened lime, fluorite, aluminum shot and whipping agent in the ladle behind the LF heating station and (contains CaO:60%, CaF
2: 10%, burning decrement: 35%, gas forming amount: 53L/Kg), the quickened lime add-on is the 5Kg/t steel, and the fluorite add-on is the 1Kg/t steel, and the aluminum shot add-on is the 0.6Kg/t steel, and the whipping agent add-on is the 6Kg/t steel.Begin to add heat refining after having added, the steel ladle bottom argon blowing air supply intensity is 0.005m during heating
3/ (mint steel), refining heating 15min stop heating and adopt big bottom blowing gas intensity to stir 5min, and this moment, bottom blowing gas intensity was 0.01m
3/ (mint steel).Continuation adds quickened lime, fluorite and aluminum shot in ladle, the add-on of quickened lime is the 4Kg/t steel, and the aluminum shot add-on is the 0.5Kg/t steel, and the fluorite add-on is the 0.8Kg/t steel, continues to add heat refining 10min, and the steel ladle bottom argon blowing air supply intensity is 0.005m during heating
3/ (mint steel).Heating finishes the back and adopts big air supply intensity to stir 5min, and this moment, bottom blowing gas intensity was 0.01m
3/ (mint steel), the LF refining finishes.
Carry out calcium after heating finishes and handle, the quantitative silicon-calcium wire (containing 38% Ca, 50% Si, 15% Fe and unavoidable impurities) of feeding 2m/t steel in the ladle, line feeding speed is 5m/s, the ladle bottom blowing air supply intensity is 0.0025m during line feeding
3/ (mint steel).The calcium processing finishes back soft blow 8min, and this moment, bottom blowing gas intensity was 0.002m
3/ (mint steel), the molten steel after the soft blow directly carries out continuous casting, and finally obtaining finished product continuously cast bloom sulphur content is 0.009%.
In sum, the method of half steel smelting low-sulfur steel of the present invention is by reducing the molten iron pretreatment desulfurizing operation, going out to increase measures such as adopting the desulfurization of big quantity of slag slag making materials and tapping residue adjustment, LF stove desulfurizing and refining, Ca processings in silicon, the converter in the half steel process and avoided desulphurization and slag skimming iron loss, half steel to smelt heat source insufficiency, improved desulfuration efficiency and the most at last Finished Steel water sulphur content control in 0.010%.
Although above by having described the present invention in conjunction with exemplary embodiment, it will be apparent to those skilled in the art that under the situation that does not break away from the spirit and scope that claim limits, can carry out various modifications and change to exemplary embodiment of the present invention.
Claims (10)
1. the method for a half steel smelting low-sulfur steel is characterized in that, said method comprising the steps of:
Directly molten iron is blended into converter extracting vanadium and blows to form half steel;
Half steel is tapped in the ladle, and in going out the half steel process, in ladle, add ferro-silicon to increase the silicone content in the molten steel;
Molten steel is blended into converter, adds slag making materials then in the converter and smelt;
Outwell the rich sulphur slag in the converter stove, mix with molten steel at the high magnesium lime from 5～7Kg/t steel to ladle that add of tapping to the process of ladle and dash, and after tapping finishes, add slag supplying agent to the ladle top of the slag;
Molten steel is carried out ar blowing refining;
Molten steel is carried out desulfurizing and refining at ladle refining furnace;
In the mode of feeding the calcium alloy line to molten steel molten steel being carried out calcium handles;
Adopt continuous casting process to carry out pouring molten steel and obtain the strand that sulphur content is not higher than 0.010wt%.
2. the method for half steel smelting low-sulfur steel according to claim 1 is characterized in that, in the step in described ladle that half steel is tapped, when reach in tap converter extracting vanadium molten steel total amount 1/3 the time, in ladle, add ferro-silicon.
3. the method for half steel smelting low-sulfur steel according to claim 1 is characterized in that, contains the silicon of 70～85wt% in the described ferro-silicon, and its add-on is 2～4Kg/t steel.
4. the method for half steel smelting low-sulfur steel according to claim 1 is characterized in that, described slag making materials comprises the quickened lime of 50～65Kg/t steel, the high magnesium lime of 25～30Kg/t steel and the slag former of 15～25Kg/t steel.
5. the method for half steel smelting low-sulfur steel according to claim 1, it is characterized in that described method also is included in after the described step of outwelling rich sulphur slag in the stove, before the converter tapping, the high magnesium lime that adds 3～5Kg/t steel in the converter carries out dry slag, the following quantity of slag when reducing tapping.
6. the method for half steel smelting low-sulfur steel according to claim 1 is characterized in that, the add-on of described slag supplying agent is 3～5Kg/t steel, and described slag supplying agent comprises 15～25% A1 by weight percentage
2O
3, 35～45% CaO, 5～15% SiO
2, 10～15% metal A l, and surplus unavoidable impurities.
7. the method for half steel smelting low-sulfur steel as claimed in claim 1 is characterized in that, the described Argon intensity that molten steel is carried out in the ar blowing refining step is 0.003～0.005m
3/ (mint steel), and argon blowing time is 5～8 minutes.
8. the method for half steel smelting low-sulfur steel according to claim 1, it is characterized in that, described molten steel is carried out in the step of desulfurizing and refining at ladle refining furnace, after adding the whipping agent of the aluminum shot of fluorite, 0.3～0.6Kg/t steel of quickened lime, 0.5～1Kg/t steel of 2.5～5Kg/t steel and 5～6Kg/t steel in the ladle, beginning adds heat refining for the first time;
Wherein, the composition of described whipping agent contains CaO:45～60%, CaF by weight percentage
2: 5～10%, burning decrement: 25～35%, gas forming amount is not less than 45L/Kg; Add in the described first time and to adopt first bottom blowing gas intensity to stir in the process of heat refining, described first bottom blowing gas intensity is 0.003～0.005m
3/ (mint
Steel), adding and stop heating behind heat refining 12～15min, and improve air supply intensity to the second bottom blowing gas intensity and stir 3～5min, described second bottom blowing gas intensity is 0.005～0.01m
3/ (mint
Steel);
Add the quickened lime of 2～4Kg/t steel, the fluorite of 0.5～0.SKg/t steel and the aluminum shot of 0.3～0.5Kg/t steel in the ladle again and carry out adding the second time heat refining, add in the described second time and to adopt described first bottom blowing gas intensity to stir in the process of heat refining, stop heating behind refining 8～10min; Then, finish refining after adopting described second air supply intensity to stir 3～5min.
9. the method for half steel smelting low-sulfur steel according to claim 1, it is characterized in that, describedly in the mode of feeding the calcium alloy line to molten steel molten steel is carried out the step that calcium handles and comprise: the amount with 2～3m/t steel feeds molten steel with silicon-calcium wire, line feeding speed is 3～5m/s, and the ladle bottom blowing air supply intensity is 0.0015～0.0025m during line feeding
3/ (mint steel), described silicon-calcium wire comprises following component by weight percentage: 32%～38% Ca, 40%～50% Si, 10%～15% Fe, all the other are unavoidable impurities.
10. the method for half steel smelting low-sulfur steel according to claim 1 is characterized in that, described method also comprises calcium processing back soft blow argon 3～8min, and Argon intensity is 0.001～0.002m
3/ (mint steel).
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