CN104060045A - Method using vanadium-titanium molten iron for smelting low oxygen low carbon IF (interstitial-free) steel - Google Patents
Method using vanadium-titanium molten iron for smelting low oxygen low carbon IF (interstitial-free) steel Download PDFInfo
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Abstract
The invention discloses a method using vanadium-titanium molten iron for smelting low oxygen low carbon IF (interstitial-free) steel, and the method comprises the following steps: 1) adding the vanadium-titanium molten iron into a t No. 1 converter for vanadium extraction smelting; 2) performing desulfurization treatment on semi steel obtained by vanadium extraction; 3) blowing oxygen for slagging of the semi steel obtained by desulfurization, then pushing off the slag to discharge steel to obtain first molten steel; 4) refining the first molten steel in a ladle furnace (LF) to obtain second molten steel; 5) enabling the second molten steel to enter into a RH processing working station for decarburization deoxidation treatment under the vacuum condition; and 6) adding a second aluminum-containing slag modifier into the second molten steel obtained by the deoxidation treatment to obtain third molten steel, and continuously casting the third molten steel. The method can effectively extract vanadium resources, and at the same time, by combination of use of the slag modifier, the low oxygen low carbon IF steel can be produced.
Description
Technical field
The present invention relates to a kind of vanadium-titanium-iron-water and smelt the method for the low carbon IF steel of hypoxemia.
Background technology
IF steel is widely used in car panel, in order to meet the performance requirement of IF steel, requires its carbon component enough low, special requirement T[O] (oxygen level)≤0.0020% and steel pure, in actual smelting process, have larger difficulty.
CN101760583A discloses a kind of method of controlling impurity in ultra low carbon IF steel, and the method is mainly by 1) determine converter terminal C, T and a[O] the span of control step of (molten steel oxygen activity); 2) ladle top slag modifying process step; 3) reduce RH endpoint molten steel T[O] step; 4) in continuous casting, bag adopts double-deck insulating covering agent to protect the step and 5 of cast) adopt the step of stopper gon technics to control the content of impurity in IF steel.Although this invention provides the production technique of ultra low carbon IF steel, can not reach the low object of carbon oxygen content in the IF steel of production control.
CN102108430A discloses the agent of a kind of ultra low-carbon steel steel slag modification and has added method, this invention by ultra low-carbon steel production process, add steel slag modification agent reaching the oxidisability that alleviates the IF steel turbulence level in when cast, reduce IF steel slag, reduce secondary oxidation that molten steel produced in casting process, avoid nozzle clogging, improve the pourability of molten steel and guarantee the object of the quality of molten steel.But this invention can not bring extra effect by adding when steel slag modification agent achieves the above object, and therefore, can not be reached for the desired carbon of performance requirement, the oxygen level that meet IF steel, thereby can not be for the production of the low carbon IF steel of hypoxemia.
Summary of the invention
The object of this invention is to provide a kind of vanadium-titanium-iron-water and smelt the method for the low carbon IF steel of hypoxemia, the method is by being used vanadium-bearing hot metal as raw material, when effectively extracting vanadium resource, in conjunction with application slag supplying agent and control the oxidisability of ladle slag in IF steel production process, to produce the IF steel of hypoxemia low-carbon (LC).
To achieve these goals, the invention provides a kind of method that vanadium-titanium-iron-water is smelted the low carbon IF steel of hypoxemia, the method comprises the following steps:
1) will be blended in No. 1 converter containing vanadium-titanium-iron-water, and under oxygen supply condition, in converter, add successively oxides-containing iron and magnesia to carry out extraction smelting of vanadium;
2) half steel obtaining after vanadium extraction is carried out to desulfurization processing;
3) half steel obtaining after desulfurization is blended in No. 2 converters, in converter, adds slag making materials to carry out oxygen blast slag making, then carry out pushing off the slag tapping, and add first containing aluminium slag supplying agent on the top of the slag of gained molten steel after pushing off the slag tapping, obtain the first molten steel;
4) described the first molten steel is carried out to the refining of LF stove, obtain the second molten steel;
5) make described the second molten steel enter RH and process station, start to vacuumize and control lift gas flow, then under vacuum condition, carry out successively decarburization and deoxidation treatment;
6) in the molten steel obtaining, add second containing aluminium slag supplying agent after deoxidation treatment, obtain the 3rd molten steel, then described the 3rd molten steel is carried out to continuous casting.
At vanadium-titanium-iron-water provided by the invention, smelt in the method for the low carbon IF steel of hypoxemia, by adopting vanadium-bearing hot metal as raw material, can be when effectively extracting vanadium resource, in conjunction with application slag supplying agent and control the oxidisability of ladle slag in IF steel production process, be of value to the IF steel of production hypoxemia low-carbon (LC).
Other features and advantages of the present invention partly in detail are described the embodiment subsequently.
Accompanying drawing explanation
Fig. 1 is the process flow sheet that vanadium-titanium-iron-water provided by the invention is smelted the method for the low carbon IF steel of hypoxemia.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
A[O of the present invention] be the concentration of free oxygen in molten steel; Described T[O] be the concentration of total oxygen in molten steel, it comprises oxygen contained in free oxygen and oxide compound; " gas " in described control lift gas flow is " argon gas "; Described " vacuum tightness " is absolute pressure; Described " molten iron " is the title of ferrous metal liquation before No. 1 converter tapping; Described " half steel " be molten metal after No. 1 converter tapping to the title before No. 2 converter tappings; Described " molten steel " is the title of molten metal after No. 2 converter tappings.
The method that a kind of vanadium-titanium-iron-water of the present invention is smelted the low carbon IF steel of hypoxemia can operate by process flow sheet as shown in Figure 1, in 1# converter, carry out extraction smelting of vanadium, then go out converter and adopt winding-up or KR method to carry out desulfurization, then enter 2# converter and carry out dephosphorization and the first step decarburization, then pushing off the slag tapping, and in pushing off the slag tapping process, add ladle dreg modifying agent (be of the present invention containing aluminium slag supplying agent), proceed to again heat temperature raising in LF stove and carry out refining, then proceed to RH vacuum-treat and carry out tapping after second step decarburization and deoxidation, and again in tapping process, add ladle dreg modifying agent, and carry out continuous casting to produce continuously cast bloom.
The invention provides a kind of vanadium-titanium-iron-water and smelt the method for the low carbon IF steel of hypoxemia, the method comprises the following steps:
1) will be blended in No. 1 converter containing vanadium-titanium-iron-water, and under oxygen supply condition, in converter, add successively oxides-containing iron and magnesia to carry out extraction smelting of vanadium;
2) half steel obtaining after vanadium extraction is carried out to desulfurization processing;
3) half steel obtaining after desulfurization is blended in No. 2 converters, in converter, adds slag making materials to carry out oxygen blast slag making, then carry out pushing off the slag tapping, and add first containing aluminium slag supplying agent on the top of the slag of gained molten steel after pushing off the slag tapping, obtain the first molten steel;
4) described the first molten steel is carried out to the refining of LF stove, obtain the second molten steel;
5) make described the second molten steel enter RH and process station, start to vacuumize and control lift gas flow, then under vacuum condition, carry out successively decarburization and deoxidation treatment;
6) in the molten steel obtaining, add second containing aluminium slag supplying agent after deoxidation treatment, obtain the 3rd molten steel, then described the 3rd molten steel is carried out to continuous casting.
Oxygen supply condition comprises adopting and oxygen rifle is set realizes in converter of the present invention, and oxygen lance position is 1.5-2.5m, and described rifle position is that liquid steel level is to the distance of oxygen rifle muzzle.
Under preferable case, in the step 1) of the method for the invention, to the method that adds oxides-containing iron and magnesia to carry out extraction smelting of vanadium in converter, can comprise: at per minute oxygen-supplying amount, be 20000-25000Nm
3condition under, continue in converter extracting vanadium, to add oxides-containing iron in oxygen supply 1-3 minute, continue in backward converter extracting vanadium, to add magnesia to carry out vanadium extraction in oxygen supply 3-5 minute.
Under preferable case, slag making materials in the step 3) of the method for the invention can be quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting, and the add-on of quickened lime is that the add-on of 15-20kg/ ton half steel, quartz sand is that the add-on of 10-15kg/ ton half steel, high magnesium lime is that the add-on of 10-15kg/ ton half steel and sludge ball of steel smelting is 2-3kg/ ton half steel.Further, under preferable case, described slag making materials all adds in oxygen rifle starts the 0-8min after oxygen supply.Wherein, the add-on of described slag making materials is that to take the total amount of the half steel after desulfurization be benchmark.
Preferably, after slag making materials adds 3-8min in the step 3) of the method for the invention, in stove, add again the high magnesium lime of 4-6kg/ ton half steel, and utilize argon gas to blow again and stir 1-3min.Wherein, the add-on of described high magnesium lime is that to take the total amount of the half steel after desulfurization be benchmark.
Under preferable case, in the step 2 of the method for the invention) in the method processed of desulfurization can be composite blowing doctor treatment or KR doctor treatment.
Preferably, described composite blowing sulfur method comprises that the composite blowing time is 30-40min; Sweetening agent is deactivating magnesium powder and lime, and lime consumption amount is 4.0-6.0kg/ ton half steel; Deactivating magnesium powder consumption is 1.2-1.5kg/ ton half steel.Described KR method comprises that churning time is 40-50min; Sweetening agent is deactivating magnesium powder and lime, and lime consumption amount is 4.0-6.0kg/ ton half steel; Deactivating magnesium powder consumption is 1.2-1.5kg/ ton half steel.Wherein, the add-on of described sweetening agent is that to take the total amount of the half steel after desulfurization be benchmark.
Under preferable case, while carrying out pushing off the slag tapping in the step 3) of the method for the invention, in tapping process, in the ladle of splendid attire molten steel, add at least one in mid-carbon fe-mn 2-4kg/ ton molten steel, quickened lime 4-8kg/ ton molten steel and fluorite 0.5-2kg/ ton molten steel.Wherein, the add-on of described mid-carbon fe-mn, quickened lime and fluorite is that to take the total amount of the half steel after desulfurization be benchmark.
Under preferable case, described in the step 3) of the method for the invention first containing containing 25-40 % by weight Al in aluminium slag supplying agent
2o
3, 30-45 % by weight CaO and 30-45 % by weight Al, the described first add-on containing aluminium slag supplying agent can be 1-3kg/ ton molten steel.Wherein, described first is that to take the total amount of the first molten steel be benchmark containing aluminium slag supplying agent add-on.
Under preferable case, in the step 3) of the method for the invention, the temperature of the first molten steel of gained is 1600-1630 ℃, the total amount of the first molten steel of take is benchmark, the main component of described the first molten steel is: 0.02-0.06 % by weight C, 0.15-0.25 % by weight Mn, 0.005-0.015 % by weight P, 0.001-0.015 % by weight S, 0.030-0.080 % by weight a[O], Fe and inevitable impurity.
Under preferable case, the step 4) of the method for the invention refining to temperature in LF stove is 1630-1650 ℃.
Under preferable case, in the step 5) of the method for the invention, the operation of carrying out successively decarburization and deoxidation treatment under vacuum condition comprises: the second measuring temp of molten steel that enters RH processing station is determined to oxygen, the oxygen requirement while determining molten steel decarburization according to the carbon oxygen relation recording.If carbon content is greater than oxygen activity, need to carry out oxygen decarburization, wherein blowing oxygen quantity can carry out conventional selection according to carbon content by those skilled in the art.For example, when No. 2 converters of production IF steel are 210 tons of converters, the blowing oxygen quantity in oxygen decarburization operation can calculate according to following formula (1).After oxygen blast completes, fast reducing vacuum tightness, guarantee in 3min, vacuum tightness to be reduced in 100Pa, then in vacuum tightness, at 100Pa, process molten steel 1-15min under with interior condition, when sampling analysis carbon content is≤0.003% (meeting IF Carbon Content Of Steel requires), carry out thermometric again and determine oxygen, and add aluminum shot to carry out deoxidation according to the second oxygen activity obtaining, wherein aluminum shot add-on can be carried out conventional selection according to the second oxygen activity by those skilled in the art.For example, when No. 2 converters of production IF steel are 210 tons of converters, aluminum shot add-on can be calculated according to following formula (2).
Formula (1): blowing oxygen quantity (Nm
3)=1.2 * [C] * W;
Formula (2): aluminum shot add-on (kg)=1.4 * a[O] * W;
Wherein, W is the weight of the second molten steel, and unit is kg; [C] carbon content for needing to reduce; A[O] be the second oxygen activity of molten steel.
Further under preferable case, in the step 5) of the method for the invention, the method of controlling lift gas flow is for from vacuumizing timing while starting, in 0-3min, lift gas flow is 1600-1800NL/min, in 4-18min, lift gas flow is 2000-2500NL/min, and when 19min-RH processing finishes, lift gas flow is 1800-2000NL/min.
Under preferable case, in the step 5) of the method for the invention, gas flow to be hoisted is that 2000-2500NL/min, vacuum tightness are while being 60-300Pa, carry out deoxidation treatment, the method of described deoxidation treatment comprises in molten steel and adds aluminum shot reductor, and the addition of described aluminum shot reductor is 0.31-0.51kg/ ton molten steel.And after deoxidation finishes, preferably in molten steel, add alloying raw material 0.1-6kg/ ton molten steel, described alloying raw material is selected from least one in manganese metal and middle carbon duriron.Wherein, to take the total amount of the second molten steel be benchmark to the add-on of described alloying raw material.
Under preferable case, in the step 6) of the method for the invention, described second contains 25-40 % by weight Al containing in aluminium slag supplying agent
2o
3, 30-45 % by weight CaO and 30-45 % by weight Al, the described second add-on containing aluminium slag supplying agent is 0.8-1.2kg/ ton molten steel.Wherein, described second containing the add-on of aluminium slag supplying agent, to take the total amount of the second molten steel be benchmark.
Under preferable case, in the step 6) of the method for the invention, described to adding second in molten steel containing also comprising the ladle of splendid attire molten steel is carried out to BOTTOM ARGON BLOWING processing after the operation of aluminium slag supplying agent, described BOTTOM ARGON BLOWING flow is 50-150NL/min, and argon blowing time is 8-20min.
A preferred embodiment of the invention, the method for producing the low carbon IF steel of hypoxemia comprises the following steps:
1) will be blended in No. 1 converter containing vanadium-titanium-iron-water, oxygen rifle is set, and oxygen lance position being 1.5-2.5m, is 20000-25000Nm at per minute oxygen-supplying amount
3condition under, continue in converter, to add oxides-containing iron in oxygen supply 1-3 minute, continue in backward converter, to add magnesia to carry out vanadium extraction in oxygen supply 3-5 minute.
2) adopt composite blowing doctor treatment or KR doctor treatment that the half steel obtaining after vanadium extraction is carried out to desulfurization processing.Described composite blowing sulfur method comprises that the composite blowing time is 30-40min; Sweetening agent is deactivating magnesium powder and lime, and lime consumption amount is 4.0-6.0kg/ ton half steel; Deactivating magnesium powder consumption is 1.2-1.5kg/ ton half steel.Described KR method comprises that churning time is 40-50min; Sweetening agent is deactivating magnesium powder and lime, and lime consumption amount is 4.0-6.0kg/ ton half steel; Deactivating magnesium powder consumption is 1.2-1.5kg/ ton half steel.
3) half steel obtaining after desulfurization is blended in No. 2 converters, in converter, adds slag making materials to carry out oxygen blast slag making.Described slag making materials is quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting, and the add-on of quickened lime is that the add-on of 15-20kg/ ton half steel, quartz sand is that the add-on of 10-15kg/ ton half steel, high magnesium lime is that the add-on of 10-15kg/ ton half steel and sludge ball of steel smelting is 2-3kg/ ton half steel.Further, under preferable case, described slag making materials all adds in oxygen rifle starts the 0-8min after oxygen supply.Slag making materials adds in the backward stove of 3-8min and adds the high magnesium lime of 4-6kg/ ton half steel again, and utilizes argon gas to blow again and stir 1-3min.Then carry out pushing off the slag tapping, in tapping process, in the ladle of splendid attire molten steel, add at least one in mid-carbon fe-mn 2-4kg/ ton molten steel, quickened lime 4-8kg/ ton molten steel and fluorite 0.5-2kg/ ton molten steel.And add first containing aluminium slag supplying agent on the top of the slag of gained molten steel after pushing off the slag tapping, and obtain the first molten steel, described first contains 25-40 % by weight Al containing in aluminium slag supplying agent
2o
3, 30-45 % by weight CaO and 30-45 % by weight Al, the described first add-on containing aluminium slag supplying agent can be 1-3kg/ ton molten steel.The temperature of described the first molten steel is 1600-1630 ℃, the total amount of the first molten steel of take is benchmark, the main component of the first molten steel is: 0.02-0.06 % by weight C, 0.15-0.25 % by weight Mn, 0.005-0.015 % by weight P, 0.001-0.015 % by weight S, 0.030-0.080 % by weight a[O], Fe and inevitable impurity.
4) described the first molten steel is carried out to the refining of LF stove, obtain the second molten steel.
5) make described the second molten steel enter RH and process station, start to vacuumize and control lift gas flow, then under vacuum condition, carry out successively decarburization and deoxidation treatment;
The operation of carrying out successively decarburization and deoxidation treatment under vacuum condition comprises: the second measuring temp of molten steel that enters RH processing station is determined to oxygen, the oxygen requirement while determining molten steel decarburization according to the carbon oxygen relation recording.If carbon content is greater than oxygen activity, need to carry out oxygen decarburization, wherein blowing oxygen quantity can carry out conventional selection according to carbon content by those skilled in the art.For example, when No. 2 converters of production IF steel are 210 tons of converters, the blowing oxygen quantity in oxygen decarburization operation can calculate according to following formula (1).After oxygen blast completes, fast reducing vacuum tightness, guarantee in 3min, vacuum tightness to be reduced in 100Pa, then in vacuum tightness, at 100Pa, process molten steel 1-15min under with interior condition, when sampling analysis carbon content is≤0.003% (meeting IF Carbon Content Of Steel requires), carry out thermometric again and determine oxygen, and add aluminum shot to carry out deoxidation according to the second oxygen activity obtaining, wherein aluminum shot add-on can be carried out conventional selection according to the second oxygen activity by those skilled in the art.For example, when No. 2 converters of production IF steel are 210 tons of converters, aluminum shot add-on can be calculated according to following formula (2).
Formula (1): blowing oxygen quantity (Nm
3)=1.2 * [C] * W;
Formula (2): aluminum shot add-on (kg)=1.4 * a[O] * W;
Wherein, W is the weight of the second molten steel, and unit is kg; [C] carbon content for needing to reduce; A[O] be the second oxygen activity of molten steel.
The method of described lift gas flow is for from vacuumizing timing while starting, in 0-3min, lift gas flow is 1600-1800NL/min, in 4-18min, lift gas flow is 2000-2500NL/min, and when 19min-RH processing finishes, lift gas flow is 1800-2000NL/min;
Be that gas flow to be hoisted is 2000-2500NL/min the opportunity of described deoxidation treatment, when vacuum tightness is 60-300Pa.The method of described deoxidation treatment comprises in molten steel and adds aluminum shot reductor, and the addition of described aluminum shot reductor is 0.31-0.51kg/ ton molten steel.And after deoxidation finishes, in molten steel, add alloying raw material 0.1-6kg/ ton molten steel, described alloying raw material is selected from least one in mid-carbon fe-mn and ferrosilicon.
6) in the molten steel obtaining, add second containing aluminium slag supplying agent after deoxidation treatment, obtain the 3rd molten steel, the ladle of splendid attire the 3rd molten steel is carried out to BOTTOM ARGON BLOWING processing, then described the 3rd molten steel is carried out to continuous casting;
Described second is identical containing aluminium slag supplying agent composition with first containing aluminium slag supplying agent, and the second add-on containing aluminium slag supplying agent is 0.8-1.2kg/ ton molten steel.Described BOTTOM ARGON BLOWING flow is 50-150NL/min, and argon blowing time is 8-20min.
Below will describe the present invention by embodiment.The starting material that use in following examples are in case of no particular description all purchased from Panzhihua Steel City Group Co., Ltd., and concrete composition is:
The composition of mid-carbon fe-mn is: the Fe of the Mn of 77 % by weight and 21 % by weight, all the other are impurity.
The composition of middle carbon duriron is: the Fe of the Si of 78 % by weight and 21 % by weight, all the other are impurity.
The composition of carbon dust is: the ash content of the C of 94 % by weight, 3.5 % by weight, the sulphur of 0.15 % by weight, the volatile matter of 1.1 % by weight and the water of 0.5 % by weight, granularity is 3-15mm.
The composition of aluminum shot is: the Al of 99.9 % by weight, all the other are trace element and impurity.
Embodiment 1
Take containing vanadium-titanium-iron-water is raw material, and its main component is: 4.03 % by weight C, 0.26% weight V, 0.18% weight Mn, 0.071 % by weight S, 0.072 % by weight P, 0.22 % by weight Si, 0.16 % by weight Ti and a small amount of inevitably impurity; This molten iron is blended into 210t blowing vanadium extracting to be bessemerized, the amount of being blended into is 238t, then in converter extracting vanadium, add refrigerant, and adopt 339 oxygen rifles to carry out oxygen supply to blow vanadium, in blowing the 3min of vanadium, in stove, add 2t iron scale, after oxygen supply 4.5min, in stove, add 300kg magnesia to carry out residue adjustment, then oxygen supply carries out pushing off the slag for 40 seconds and go out half steel and vanadium slag, blow end point temperature is 1437 ℃.Half composition of steel obtaining is: 3.41 % by weight C, 0.07 % by weight Mn, 0.065 % by weight P, 0.067 % by weight S, 0.027 % by weight V, surplus is Fe and inevitable impurity.
Half steel after vanadium extraction is delivered to desulfurization station and carry out desulfurization, adopt the desulfurization of KR method.Desulfurization time is 38min; Sweetening agent is deactivating magnesium powder and lime, and lime consumption amount is 5.5kg/ ton half steel; Deactivating magnesium powder consumption is 1.35kg/ ton half steel.Half composition of steel obtaining after desulfurization is: 3.36 % by weight C, 0.06 % by weight Mn, 0.062 % by weight P, 0.003 % by weight S, 0.026 % by weight V, surplus is Fe and inevitable impurity.
Half steel after desulfurization is blended into blow again steel converter blowing of 210t, the amount of being blended into is 235t, and adopt 536 oxygen rifles to carry out the decarburization of oxygen supply slag making dephosphorization, starting the oxygen blown while, carry out steelmaking slagging, in stove, add slag making materials quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting, and slag making materials is all added opening to blow in oxygen supply 6min, the add-on of slag making materials quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting is respectively 18kg/ ton half steel, 11kg/ ton half steel, 13.5kg/ ton half steel and 2.2kg/ ton half steel; Oxygen supply time is oxygen feeding stop lifting oxygen rifle in the time of 874 seconds, now bessemer furnace slag basicity is 3.1, acquisition temperature is the molten steel of 1687 ℃, the main component of molten steel: 0.036 % by weight C, 0.06 % by weight Mn, 0.007 % by weight P, 0.0024 % by weight S, the a[O of 0.083 % by weight], surplus is Fe and inevitable impurity.The high magnesium lime that adds 4.5kg/ ton half steel in the backward stove of 4min, utilize argon gas to blow again and stir 2min, carry out pushing off the slag tapping, in tapping process, in ladle, add mid-carbon fe-mn 2.8kg/ ton molten steel, quickened lime 5.0kg/ ton molten steel, has gone out on the backward ladle top of the slag of steel and has added first containing aluminium slag supplying agent 3kg/ ton molten steel.215 tons, first molten steel of alloying, temperature is 1601 ℃, its composition is 0.008 % by weight P, 0.0036 % by weight S, 0.034 % by weight C, 0.151 % by weight Mn, 0.075 % by weight a[O], surplus is Fe and inevitable impurity.
The first molten steel is sent to LF again and processes, molten steel is passed through to the electrically heated of LF stove and refining.Ladle is during to LF electrically heated, and the treatment time stops heating after being 25min, obtains the second molten steel.After soft blow argon 5min, by the second molten steel departures, LF out-station temperature is 1641 ℃.
The second molten steel after LF is processed is delivered to RH vacuum-treat, and now temperature is 1621 ℃, and carbon content is 0.035 % by weight, a[O] be 0.084 % by weight, do not need oxygen blast.Start to vacuumize, lift gas (argon gas) flow is 1600NL/min.3min final vacuum degree is reduced to 290Pa, adjusts lift gas (argon gas) flow to 2500NL/min, and the treatment time that vacuum tightness is 290Pa is 12min; Process after 12min, keep vacuum tightness, recording oxygen activity is 0.021 % by weight, then to molten steel in vacuum chamber, adds aluminum shot 0.31kg/ ton molten steel, carries out deoxidation.Deoxidation aluminum shot adds after 2min, adds ferrosilicon 1.5kg/ ton molten steel and manganese metal 0.375kg/ ton molten steel, after ferrosilicon and manganese metal add in vacuum chamber, adjust lift gas (argon gas) flow to 1800NL/min, continue to process after 7min, vacuum breaker, RH processing finishes.To the top of the slag in ladle, add second containing aluminium slag supplying agent 1kg/ ton molten steel, after the argon flow amount BOTTOM ARGON BLOWING 16min of ladle employing 80NL/min, obtain the 3rd molten steel, by the 3rd molten steel departures, the 3rd molten steel composition is 0.010 % by weight P, 0.004 % by weight S, 0.0022 % by weight C, and surplus is Fe and inevitable impurity.Then ladle is sent to continuous casting.
By the 3rd molten steel in this ladle, by adopting continuous casting protection pouring Technology to obtain section, be the low carbon IF steel strand of 200mm * 1080mm hypoxemia product.
Known to the continuously cast bloom sampling analysis of producing, its T[O] average out to 0.0017 % by weight, carbon content average out to 0.0029 % by weight.
Embodiment 2
Take containing vanadium-titanium-iron-water is raw material, its main component is: 4.12 % by weight C, 0.25 % by weight V, 0.16 % by weight Mn, 0.071 % by weight S, 0.089 % by weight P, 0.17 % by weight Si, 0.16 % by weight Ti and a small amount of inevitably impurity, this molten iron is blended into 210t blowing vanadium extracting to be bessemerized, the amount of being blended into is 238t, then in converter extracting vanadium, add refrigerant, and adopt 339 oxygen rifles to carry out oxygen supply to blow vanadium, in blowing the 3min of vanadium, in stove, add 2.5t iron scale, after oxygen supply 4.6min, in stove, add 280kg magnesia to carry out residue adjustment, oxygen supply is carried out pushing off the slag for 55 seconds and is gone out half steel and vanadium slag again, blow end point temperature is 1445 ℃.Half composition of steel obtaining is: 3.71 % by weight C, 0.05 % by weight Mn, 0.082 % by weight P, 0.071 % by weight S, 0.026 % by weight V, surplus is Fe and inevitable impurity.
Half steel after vanadium extraction is delivered to desulfurization station and carry out desulfurization, adopt the desulfurization of KR method, churning time is 42min; Sweetening agent is deactivating magnesium powder and lime, and lime consumption amount is 5.8kg/ ton half steel; Deactivating magnesium powder consumption is 1.42kg/ ton half steel.Half composition of steel obtaining after desulfurization is: 3.7 % by weight C, 0.04 % by weight Mn, 0.085 % by weight P, 0.001 % by weight S, 0.022 % by weight V and inevitable impurity.
Half steel after desulfurization is blended into blow again steel converter blowing of 210t, the amount of being blended into is 235t, and adopt 536 oxygen rifles to carry out the decarburization of oxygen supply slag making dephosphorization, starting the oxygen blown while, carry out steelmaking slagging, in stove, add slag making materials quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting, and slag making materials is all added opening to blow in oxygen supply 7min, the add-on of slag making materials quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting is respectively 19kg/ ton half steel, 12kg/ ton half steel, 13kg/ ton half steel and 2.5kg/ ton half steel; Oxygen supply time is oxygen feeding stop lifting oxygen rifle in the time of 920 seconds, now bessemer furnace slag basicity is 3.2, acquisition temperature is the molten steel of 1675 ℃, the main component of molten steel: 0.041 % by weight C, 0.05 % by weight Mn, 0.006 % by weight P, 0.0028 % by weight S, the a[O of 0.067 % by weight], surplus is Fe and inevitable impurity.The high magnesium lime that adds 5kg/ ton half steel in the backward stove of 5min, utilize argon gas to blow again and stir 1.5min, carry out pushing off the slag tapping, in tapping process, in ladle, add quickened lime 4kg/ ton molten steel, mid-carbon fe-mn 2.95kg/ ton molten steel, gone out on the backward ladle top of the slag of steel and added first containing aluminium slag supplying agent 2.5kg/ ton molten steel.218 tons, first molten steel of alloying, temperature is 1603 ℃, its composition is 0.007 % by weight P, 0.004 % by weight S, 0.042 % by weight C, 0.15 % by weight Mn, 0.064 % by weight a[O], surplus is Fe.
The first molten steel is sent to LF again and processes, the first molten steel is passed through to the electrically heated of LF stove and refining.Ladle is during to LF electrically heated, and the treatment time stops heating after being 23min, obtains the second molten steel.After soft blow argon 6min, by the second molten steel departures, LF out-station temperature is 1643 ℃.
The second molten steel after LF is processed is delivered to RH vacuum-treat, and now temperature is 1621 ℃, and carbon content is 0.044 % by weight, a[O] be 0.066 % by weight, do not need oxygen blast.Start to vacuumize, lift gas (argon gas) flow is 1800NL/min.3min final vacuum degree is reduced to 295Pa, adjusts lift gas (argon gas) flow to 2400NL/min, maintains this vacuum tightness and processes 13min; Process after 13min, keep vacuum tightness, recording oxygen activity is 0.032 % by weight, then to molten steel in vacuum chamber, adds aluminum shot 0.45kg/ ton molten steel, carries out deoxidation.Deoxidation aluminum shot adds after 2min, adds ferrosilicon 1.2kg/ ton molten steel and manganese metal 0.225kg/ ton molten steel, after ferrosilicon and manganese metal add in vacuum chamber, adjust lift gas (argon gas) flow to 2000NL/min, continue to process after 8min, vacuum breaker, RH processing finishes.To the top of the slag in ladle, add second containing aluminium slag supplying agent 1.1kg/ ton molten steel, ladle obtains the 3rd molten steel after adopting the argon flow amount BOTTOM ARGON BLOWING 16min of 85NL/min, and the 3rd molten steel composition is 0.008 % by weight P, 0.005 % by weight S, 0.0018 % by weight C.Then the 3rd molten steel is sent to continuous casting.
By the 3rd molten steel in this ladle, by adopting continuous casting protection pouring Technology to obtain section, be the low carbon IF steel strand of 220mm * 1150mm hypoxemia product.
Known to the continuously cast bloom sampling analysis of producing, its T[O] average out to 0.0018 % by weight, carbon content average out to 0.0023 % by weight.
Embodiment 3
Take containing vanadium-titanium-iron-water is raw material, and its main component is: 4.32 % by weight C, 0.25 % by weight V, 0.11 weight weight %Mn, 0.067 % by weight S, 0.083 % by weight P, 0.12 % by weight Si, 0.15 % by weight Ti and a small amount of inevitably impurity; This molten iron is blended into 210t blowing vanadium extracting to be bessemerized, the amount of being blended into is 236t, then in converter extracting vanadium, add refrigerant, and adopt 339 oxygen rifles to carry out oxygen supply to blow vanadium, in blowing the 3min of vanadium, in stove, add 2.3t iron scale, after oxygen supply 5.1min, in stove, add 320kg magnesia to carry out residue adjustment, then oxygen supply carries out pushing off the slag for 42 seconds and go out half steel and vanadium slag, blow end point temperature is 1438 ℃.Half composition of steel obtaining is: 3.80 % by weight C, 0.05 % by weight Mn, 0.086 % by weight P, 0.067 % by weight S, 0.023 % by weight V, surplus is Fe and inevitable impurity.
Half steel after vanadium extraction is delivered to desulfurization station and carry out desulfurization, adopt the desulfurization of KR method, churning time is 43min; Sweetening agent is deactivating magnesium powder and lime, and lime consumption amount is 5.5kg/ ton half steel; Deactivating magnesium powder consumption is 1.2kg/ ton half steel.Half composition of steel obtaining after desulfurization is: 3.8 % by weight C, 0.05 % by weight Mn, 0.082 % by weight P, 0.002 % by weight S, 0.022 % by weight V and inevitable impurity.
Half steel after desulfurization is blended into blow again steel converter blowing of 210t, the amount of being blended into is 237t, and adopt 536 oxygen rifles to carry out the decarburization of oxygen supply slag making dephosphorization, starting the oxygen blown while, carry out steelmaking slagging, in stove, add slag making materials quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting, and slag making materials is all added opening to blow in oxygen supply 6min, the add-on of slag making materials quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting is respectively 17kg/ ton half steel, 10kg/ ton half steel, 15kg/ ton half steel and 2.3kg/ ton half steel; Oxygen supply time is oxygen feeding stop lifting oxygen rifle in the time of 810 seconds, now bessemer furnace slag basicity is 3.4, acquisition temperature is the molten steel of 1682 ℃, the main component of molten steel: 0.055 % by weight C, 0.05 % by weight Mn, 0.004 % by weight P, 0.0025 % by weight S, the a[O of 0.047 % by weight], surplus is Fe and inevitable impurity.The high magnesium lime that adds 6kg/ ton half steel in the backward stove of 3min, utilize argon gas to blow again and stir 3min, carry out pushing off the slag tapping, in tapping process, in ladle, add quickened lime 4kg/ ton molten steel, mid-carbon fe-mn 2.05kg/ ton molten steel, gone out on the backward ladle top of the slag of steel and added first containing aluminium slag supplying agent 1.2kg/ ton molten steel.221 tons, first molten steel of alloying, temperature is 1615 ℃, its composition is 0.005 % by weight P, 0.003 % by weight S, 0.056 % by weight C, 0.15 % by weight Mn, 0.045 % by weight a[O], surplus is Fe and inevitable impurity.
Gained the first molten steel is sent to LF and processes, the first molten steel is passed through to the electrically heated of LF stove and refining.Ladle is during to LF electrically heated, and the treatment time stops heating after being 24min.After soft blow argon 6min, obtain the second molten steel, the second molten steel LF out-station temperature is 1645 ℃.
The second molten steel after LF is processed is delivered to RH vacuum-treat, and now temperature is 1619 ℃, and carbon content is 0.058 % by weight, a[O] be 0.048 % by weight, need oxygen blast carbon drop 0.01 % by weight.Start to vacuumize oxygen blast 26Nm
3, after 1min, oxygen blast completes.When vacuum-treat starts, lift gas (argon gas) flow is 1800NL/min.6min final vacuum degree is reduced to 98Pa, lift gas (argon gas) flow is adjusted to 2500NL/min, maintain vacuum tightness 98Pa and process after 14min, recording oxygen activity is 0.026 % by weight, then to molten steel in vacuum chamber, add aluminum shot 0.36kg/ ton molten steel, carry out deoxidation.Deoxidation aluminum shot adds after 2min, adds ferrosilicon 1.0kg/ ton molten steel and manganese metal 0.45kg/ ton molten steel, after ferrosilicon and manganese metal add in vacuum chamber, adjust lift gas (argon gas) flow to 1800NL/min, continue to process after 7min, vacuum breaker, RH processing finishes.To the top of the slag in ladle, add second containing aluminium slag supplying agent 0.9kg/ ton molten steel, ladle obtains the 3rd molten steel after adopting the argon flow amount BOTTOM ARGON BLOWING 18min of 85NL/min, and the 3rd molten steel composition is 0.007 % by weight P, 0.004 % by weight S, 0.0021 % by weight C.Then the 3rd molten steel is sent to continuous casting.
By the 3rd molten steel in this ladle, by adopting continuous casting protection pouring Technology to obtain section, be the low carbon IF steel strand of 230mm * 1850mm hypoxemia product.
Known to the continuously cast bloom sampling analysis of producing, its T[O] average out to 0.0016 % by weight, carbon content average out to 0.0026 % by weight.
Comparative example 1
According to the method described in embodiment 1, produce the low carbon IF steel of hypoxemia, difference is at converter tapping process and RH departures process, not add containing aluminium slag supplying agent, its T[O of continuously cast bloom sampling analysis to it] average out to 0.0036 % by weight, carbon content average out to 0.0026 % by weight, its T[O] too high (higher than 20ppm), can not meet following process requirement.
Comparative example 2
According to the method described in embodiment 1, produce the low carbon IF steel of hypoxemia, difference is that molten steel directly sets off without BOTTOM ARGON BLOWING in RH treating processes, the continuously cast bloom T[O of its production] average out to 0.0032 % by weight, carbon content average out to 0.0031 % by weight, its T[O] (higher than 20ppm) and carbon content (higher than 30ppm) all too high, can not meet following process requirement.
Comparative example 3
According to the method described in embodiment 1, produce the low carbon IF steel of hypoxemia, difference is that lift gas flow adopts 1800NL/min always in RH treating processes, the continuously cast bloom T[O of its production] average out to 0.0026 % by weight, carbon content average out to 0.0052 % by weight, its T[O] (higher than 20ppm) and carbon content (higher than 30ppm) all too high, can not meet following process requirement.
Result by above embodiment 1-3 and comparative example 1-3 can be found out, the method of the low carbon IF steel of production hypoxemia provided by the invention is by adding in different operations containing aluminium slag supplying agent to control the oxidisability of ladle slag, thereby to molten steel diffusive deoxidation, reach the T[O of molten steel] be controlled at 0.0020 % by weight with interior object.Meanwhile, from embodiment and comparative example, can find out the control of method of the present invention to lift gas flow, guarantee the production of qualified low carbon IF steel, guarantee that carbon content control is in 0.0030 % by weight.Adopt vanadium-bearing hot metal to produce IF steel and there is no at home this technique report, by method of the present invention, both guaranteed the abundant extraction of vanadium resource, also produced high quality low-carbon (LC) hypoxemia IF steel simultaneously.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, between various embodiment of the present invention, also can carry out arbitrary combination, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. vanadium-titanium-iron-water is smelted a method for the low carbon IF steel of hypoxemia, it is characterized in that, the method comprises the following steps:
1) will be blended in No. 1 converter containing vanadium-titanium-iron-water, and under oxygen supply condition, in converter, add successively oxides-containing iron and magnesia to carry out extraction smelting of vanadium;
2) half steel obtaining after vanadium extraction is carried out to desulfurization processing;
3) half steel obtaining after desulfurization is blended in No. 2 converters, in converter, adds slag making materials to carry out oxygen blast slag making, then carry out pushing off the slag tapping, and add first containing aluminium slag supplying agent on the top of the slag of gained molten steel after pushing off the slag tapping, obtain the first molten steel;
4) described the first molten steel is carried out to the refining of LF stove, obtain the second molten steel;
5) make described the second molten steel enter RH and process station, start to vacuumize and control lift gas flow, then under vacuum condition, carry out successively decarburization and deoxidation treatment;
6) in the molten steel obtaining, add second containing aluminium slag supplying agent after deoxidation treatment, obtain the 3rd molten steel, then described the 3rd molten steel is carried out to continuous casting.
2. method according to claim 1, wherein, in step 1), comprises to the method that adds successively oxides-containing iron and magnesia to carry out extraction smelting of vanadium in converter: at per minute oxygen-supplying amount, be 20000-25000Nm
3condition under, continue in converter, to add oxides-containing iron in oxygen supply 1-3 minute, continue in backward converter, to add magnesia to carry out vanadium extraction in oxygen supply 3-5 minute.
3. method according to claim 1 and 2, wherein, in step 2) in, the method that desulfurization is processed is composite blowing doctor treatment or KR doctor treatment.
4. method according to claim 1, wherein, in step 3), described slag making materials is quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting, and the add-on of quickened lime is that the add-on of 15-20kg/ ton half steel, quartz sand is that the add-on of 10-15kg/ ton half steel, high magnesium lime is that the add-on of 10-15kg/ ton half steel and sludge ball of steel smelting is 2-3kg/ ton half steel.
5. method according to claim 1, wherein, in step 3), in carrying out pushing off the slag tapping process, in the ladle of splendid attire the first molten steel, add at least one in mid-carbon fe-mn 2-4kg/ ton molten steel, quickened lime 4-8kg/ ton molten steel and fluorite 0.5-2kg/ ton molten steel.
6. method according to claim 1, wherein, in step 3), described first contains 25-40 % by weight Al containing in aluminium slag supplying agent
2o
3, 30-45 % by weight CaO and 30-45 % by weight Al, the described first add-on containing aluminium slag supplying agent is 1-3kg/ ton molten steel.
7. method according to claim 1, wherein, in step 4), in LF stove, refining to temperature is 1630-1650 ℃.
8. method according to claim 1, wherein, in step 5), the method for deoxidation treatment comprises in molten steel and adds aluminum shot reductor, the addition of described aluminum shot reductor is 0.31-0.51kg/ ton molten steel.
9. method according to claim 1, wherein, in step 6), described second contains 25-40 % by weight Al containing in aluminium slag supplying agent
2o
3, 30-45 % by weight CaO and 30-45 % by weight Al, the described second add-on containing aluminium slag supplying agent is 0.8-1.2kg/ ton molten steel.
10. method according to claim 1, wherein, in step 6), in molten steel, add second containing also comprising the ladle of splendid attire molten steel is carried out to BOTTOM ARGON BLOWING processing after the operation of aluminium slag supplying agent, described BOTTOM ARGON BLOWING flow is 50-150NL/min, and argon blowing time is 8-20min.
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