CN103911487A - Method for smelting of ultra-low carbon steel and continuous casting method for ultra-low carbon steel - Google Patents
Method for smelting of ultra-low carbon steel and continuous casting method for ultra-low carbon steel Download PDFInfo
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Abstract
The invention provides a method for smelting of ultra-low carbon steel and a continuous casting method for ultra-low carbon steel. The method comprises: (1) employing a converter to perform primary smelting on molten iron or semisteel with a sulfur content of less than 0.015wt%, and then subjecting the molten steel obtained by primary smelting to tapping into ladle; adding a slag material with alkalinity of 4-5 and an SiO2 content of less than or equal to 20wt% during tapping; making the total content of FeO and MnO% in the ladle slag less than or equal to 15wt%; controlling the tapping temperature of the converter at 1600-1700DEG C, the carbon content at a blowing end point at 0.04-0.06wt%, and the oxygen activity at 0.03-0.07wt%; and (2) carrying out decarbonization and deoxidation alloying on the molten steel obtained in step (1) in an RH vacuum device under vacuum conditions in order recurrently, with the carbon content of the molten steel being less than 30ppm under the decarbonization conditions. The method provided by the invention can improve the molten steel quality of ultra-low carbon steel, ensures stable and batch production of IF (interstitial free) steel with a C content of less than 30ppm and deepest decarbonization of less than 6ppm.
Description
Technical field
The present invention relates to a kind of method of smelting suprelow carbon steel and a kind of method of continuous casting ultra low-carbon steel.
Background technology
Adopt the advanced smelting technologys such as BOF blowing+RH vacuum circulation degassing, reduce the carbon content (0.005-0.010 % by weight) in steel, add titanium, niobium element fixed carbon, oxygen element, thereby obtain the pure ferritic steel of gap-free atom, be gapless atomic steel, be called for short IF steel (Interstitial Free Steel).In recent years, because the requirement to steel quality improves day by day, the carbon content in steel is had higher requirement.C content in some the requirement IF of advanced steel mills steel is 0.002 % by weight in the world.Following table 1 is typical IF steel.
Table 1
| Sequence number | C (% by weight) | Si (% by weight) | Mn (% by weight) | P (% by weight) |
| 1 | 0.0008 | 0.017 | 0.256 | 0.062 |
| 2 | 0.0014 | 0.010 | 0.231 | 0.077 |
| 3 | 0.0009 | 0.010 | 0.219 | 0.074 |
As can be seen from Table 1, IF steel has strict requirement to carbon content, generally all be controlled at below 0.002 % by weight, but if make the carbon content of finished product lower, as make carbon content be less than or equal to 30ppm, the comprehensive qualified rate of IF steel can be lower, and this can restrict the production of ultra low-carbon steel and the exploitation of kind, is also unfavorable for stablizing, producing in bulk ultra low-carbon steel.
Summary of the invention
The object of the invention is to overcome the lower defect of product qualified rate of the ultra low-carbon steel that the method for the smelting suprelow carbon steel that adopts prior art obtains, provide a kind of and can stablize, production carbon content is in bulk less than or equal to the method for the ultra low-carbon steel of 30ppm, and the finished product of the ultra low-carbon steel obtaining [C] qualification rate is high.
The invention provides a kind of method of smelting suprelow carbon steel, wherein, the method comprises:
(1) molten iron or the half steel that use converter that sulphur content is less than to 0.015 % by weight carry out just refining, then the molten steel that just refining obtains are tapped in ladle;
In tapping process, adding basicity is 4-5, SiO
2the slag charge of content≤20 % by weight; Make FeO in ladle slag and total content≤15 % by weight of MnO;
Described Tapping Temperature of Bof is 1600-1700 DEG C, and blow end point carbon content is 0.04-0.06 % by weight, and oxygen activity is 0.03-0.07 % by weight;
(2) molten steel step (1) being obtained under vacuum condition in RH vacuum unit circulation carry out successively decarburization and deoxidation alloying, the condition of decarburization makes carbon content in molten steel below 30ppm.
The present invention also provides a kind of method of continuous casting ultra low-carbon steel, the method comprises that the molten steel that smelting is obtained injects tundish and molten steel is poured into crystallizer to be pulled continuously with cooling from tundish, wherein, the molten steel that described smelting obtains is the molten steel obtaining by the method for smelting suprelow carbon steel of the present invention.
Method provided by the invention is mainly to analyze by carbon content of molten steel and oxygen level variation tendency in [C], [O] variation and the vacuum treated carbon rejection process of RH in the whole flow process of IF smelting steel, cancel after the pre-deoxidation alloying in tapping process, improved molten steel blow end point C content; And by the decarbonization process in RH treating processes, preferred natural decarbonization process under preferable case, and the pressure decarbonization process that carries out of optimized choice, thus meet the requirement of molten steel C content.Thereby realize the steel quality that improves ultra low-carbon steel, ensure to produce stably, in bulk C content below 30ppm, the darkest decarburization reaches the IF steel of 6ppm, thereby solve the lower problem of finished product [C] qualification rate of ultra low-carbon steel, decarburization simultaneously finishes [O]≤250ppm, reduce the consumption of reductor aluminium, improve Cleanliness of Molten Steel, improve pourability of molten steel.
Other features and advantages of the present invention are described in detail the embodiment part subsequently.
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.
It should be noted that, it is benchmark that the amount of following described molten steel all refers to just to refine the molten steel obtaining.
In this specification sheets term " top bottom blowing " used refer to by oxygen rifle under the condition of top blast oxygen in converter, and make steel under the condition of bottom blowing shielding gas in converter.
In the present invention, ppm is ppm by weight.
According to the present invention, in step (1), can reduce by converter top bottom blowing the oxygen level of tapping molten steel, described top bottom blowing can be strengthened melting bath stirring, promote steel-slag surface reaction, reaction is closer to equilibrium state, so reduced significantly the Excess oxygen content in molten steel and slag.Converter top bottom blowing is converter steel making method well known in the art, and therefore, the present invention does not elaborate at this.It is to ensure that RH produces the favourable condition of ultra low-carbon steel that converter tapping endpoint carbon content, temperature are coordinated, in order to improve oxygen blast strengthening decarburization capacity under vacuum condition, can improve converter tapping carbon concentration, and reduce tapping temperature, so that the coordination of must tap carbon content and temperature.Therefore, as long as ensure that making described converter tapping liquid steel temperature is 1600-1700 DEG C, be preferably 1620-1640 DEG C, blow end point carbon content is 0.04-0.06 % by weight, and oxygen activity is 0.03-0.07 % by weight.
Preferably, described converter top bottom blowing is top blast oxygen, bottom blowing shielding gas, top blast oxygen 15000-35000 standard cube m/h, and oxygen blow duration can regulate according to actual needs, is generally 8-15 minute; The intensity of bottom blowing shielding gas is 0.01-0.1Nm
3/ ton molten steel min.For example, can for example,, at Primary period bottom blowing inactive gas (nitrogen), switch to bottom blowing rare gas element (for example argon gas) in the blowing later stage.In addition, described converter top bottom blowing also comprises the rear bottom blowing 6-10min argon gas of tapping, and intensity is 0.1-3Nm
3/ ton molten steel min stirs before strengthening the terminal before tapping, thereby further reduces the oxygen level of tapping molten steel.Described shielding gas is rare gas element and/or nitrogen, and wherein said rare gas element is preferably argon gas.
For the reactive aluminum reducing in hyperoxia voltinism slag and the molten steel in ladle produces Al
2o
3, in step (1), preferably in tapping process, carry out pushing off the slag, that is, remove most of hyperoxia voltinism slag by pushing off the slag technology, meanwhile, according to the present invention, in step (1), adding basicity is 4-5, SiO
2the slag charge of content≤20 % by weight carries out ladle slag upgrading; Total content≤15 % by weight (in the slag after tapping rear slag stopping, the total content of FeO and MnO reduces) that makes FeO and the MnO of ladle slag, object is to control the oxidisability of ladle slag, i.e. the FeO of ladle slag and the total content of MnO reduces oxygen in slag and transmits in molten steel.Under preferable case, the add-on of described slag charge is 0.09-5 kg/ton molten steel.
According to the present invention, described activity oxygen level refers to free oxygen concn in molten steel.The measuring method of described activity oxygen level is conventionally known to one of skill in the art, for example: adopt apparatus for determination of oxygen to measure.In described ladle slag, in the measuring method of FeO and ladle slag, the measuring method of MnO is conventionally known to one of skill in the art: for example, can adopt dichromate titration (chemical assay) to measure the content of FeO in ladle slag; Can adopt infrared spectrometry (determining instrument employing x-ray spectrometer) is the content that fluorescent method (physical measurement) is measured MnO in ladle slag.
According to the present invention, wherein, as long as ensure that the basicity of described slag charge is 4-5, SiO
2content≤20 % by weight, other of described slag charge consist of conventionally known to one of skill in the art.For example, the physical and chemical index of described slag charge is as shown in the table.
According to the present invention, contriver finds by research, and the benefit of not carrying out pre-deoxidation alloying in tapping process is to improve yield of alloy, reduce costs, due to early stage oxygen activity higher, alloy oxidation scaling loss is larger, causes yield of alloy on the low side.
According to the present invention, in step (2), the molten steel that step (1) is obtained circulates and carries out successively decarburization and deoxidation alloying under vacuum condition in RH vacuum unit.
The present inventor's discovery, the higher decarburized amount of initial carbon content is larger.But at a certain temperature, according to Vachef-Hamiltoh, it is a constant that molten steel carbon oxygen concn before vacuum decarburization amasss, and is 2.5x10 in the time of 1600 DEG C
-3, suppose that in the time of vacuum decarburization the oxygen in molten steel is all used for decarburization, according to oxidation of coal reactional equation, maximum decarburized amount is 1600 DEG C time:
Δ[C]=0.75[O]。＝1.875×10
-3/[C]。
From above formula, only have in the time that molten steel initial carbon content is higher and could significantly reduce carbon content.Theoretical Calculation shows, as initial w (C) <4.33x10
-6time just can remove all carbon in steel, but due to the restriction of temperature and decarbonization rate, in fact all carbon can not be removed.Also can be found out by above formula, if initial carbon content higher (being greater than 0.06 % by weight), in order to improve decarburized amount, can be realized by oxygen supply in steel, force carbonization treatment technique.Therefore,, according to the present invention, the method for described decarburization comprises the pressure decarburization that nature decarburization and selectivity are carried out.
According to the present invention, the condition of described natural decarburization comprises: pressure, argon gas are blown into intensity and decarburization time.When driving gas flow mistake, will produce vigorous splash, when serious, can cause the consequence such as alloy chute, baking hole plug.Between natural carbon period, in molten steel, there is a large amount of CO bubble formations, increase the weight of splash occurrence degree, therefore, in the time of natural decarburization, argon gas is blown into intensity and is preferably molten steel 6-15 liter/min per ton, and more preferably, it is molten steel 10-15 liter/min per ton that argon gas is blown into intensity.
In natural carbon rejection process, the control principle of vacuum tightness is to ensure certain decarbonization rate, ensure that again splashings do not stop up alloy chute and baking hole, the present inventor finds, in the time of natural decarburization, making the pressure in RH vacuum unit is 0-1000 handkerchief, being preferably pressure is 0-200 handkerchief, can effectively reduce splash and occur, and be beneficial to decarburization.
The time of nature decarburization, for example, the time of described natural decarburization can be 15-25 minute, is preferably 15-20 minute as long as the carbon content in molten steel is below 30ppm after ensureing decarburization.If because the reasons such as treatment time deficiency cause carbon content not meet the demands, and in order further to improve the quality of molten steel, preferably need further to force decarburization.
According to the present invention, described pressure decarburization comprises in molten steel and is blown into oxygen, comprehensively determines the amount of oxygen blast gas according to carbon, oxygen balance and resistance to material carburetting, and carbon content is preferably reduced to below 25ppm, more preferably can make carbon content be reduced to below 15ppm.
Wherein, the condition of described pressure decarburization comprises that pressure, argon gas are blown into intensity, blowing oxygen quantity and decarburization time.Process the decarburization later stage at conventional RH, reaction between carbon and oxygen is not too fierce, a little less than splash relatively, is the main task that RH processes in dark decarburization of time so, gas clean-up as far as possible.In general, in the time forcing decarburization, making the pressure in RH vacuum unit is 0-10000 handkerchief, and preferably, pressure is 1000-10000 handkerchief.The amount of being blown into of oxygen is 800-1600 standard cube m/h, is preferably 1200-1400 standard cube m/h.It is molten steel 6-20 liter/min per ton that argon gas is blown into intensity, is preferably molten steel 6-10 liter/min per ton.The time of described pressure decarburization is as long as the carbon content in molten steel requires after ensureing decarburization, and forcing the time of decarburization can, according to the amount decision of oxygen blast gas, can be 3-15 minute conventionally, is preferably 3-10 minute.
In step (2), the method of described deoxidation alloying comprises in the molten steel after decarburization and adds aluminum shot reductor and ferro-titanium, the add-on of aluminum shot reductor makes molten steel [Als] (acid-soluble aluminium) for 0.04-0.06 % by weight, oxygen activity≤20ppm(weight content); The add-on of ferro-titanium makes the amount of titanium component reach the middle limit that steel grade requires.And can add as required other alloys, such as ferro-niobium, ferromanganese etc.Wherein, the measuring method of acid-soluble aluminium is conventionally known to one of skill in the art, for example, can adopt spectrum analyzer to measure.Wherein, described " middle limit " scope of 0.03 % by weight that refers to fluctuate up and down taking " the middle limit " of the desired each component content of steel grade as benchmark.Wherein, the add-on of aluminum shot reductor is generally 0.5-5 kg/ton molten steel, is preferably 1-3 kg/ton molten steel.
According to the present invention, the process of described deoxidation alloying is carried out in RH vacuum unit, and after alloying, splash weakens, and therefore suitable driving gas flux values raising can be conducive to abundant stirring, evenly composition and inclusion floating.Under preferable case, it is molten steel 6-20 liter/min per ton that argon gas is blown into intensity, and pressure is 0-1000 handkerchief.
Under preferable case, reduce compared with liquid steel temperature far away and that cause for fear of ladle shipment distance, the method is carried out temperature adjustment processing by molten steel, to make the temperature of described molten steel as 1620-1640 DEG C before also comprising that the molten steel that step (1) is obtained enters in RH vacuum unit circulation.
According to the present invention, the method of described continuous casting can be carried out according to the method for this area routine, for example, molten steel is injected to tundish and molten steel is poured into crystallizer from tundish, cooling by crystallizer, make the molten steel surface duricrust that congeals into, hard-shelled this tool molten steel is pulled straight from the outlet of crystallizer, obtain continuously cast bloom.
According to the present invention, the method also comprises to be injected molten steel tundish before or adds tundish covering flux simultaneously, and the described tundish covering flux adding to the liquid steel level of tundish can play the tundish covering flux that prevents liquid steel level oxidation for various.Under preferable case, (described basicity refers to CaO and SiO in insulating covering agent to the basicity of described tundish covering flux
2weight ratio) be greater than 5, be preferably 6-8; SiO
2content≤8 % by weight.Under preferable case, described tundish covering flux can contain CaO, SiO
2, MgO, Al
2o
3and CaF
2, taking the gross weight of this tundish covering flux as benchmark, the content of described CaO is 40-50 % by weight, described SiO
2content be 2-8 % by weight, described Al
2o
3content be 30-40 % by weight, the content of described MgO is 2-6 % by weight, described CaF
2content be 5-10 % by weight.Under preferable case, the consumption of described tundish covering flux can be 0.1-0.5 kg/ton molten steel.
The present invention improves mainly for smelting process, and other operation is for example poured into a mould, pulled etc. is method well known in the art, does not elaborate at this.Preferably, molten steel or steel billet secondary oxidation when preventing continuous casting, in Pour Steel process and steel billet is pulled continuously, in process of cooling, provide protection of inert gas to molten steel and steel billet.
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, and 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, also can carry out arbitrary combination between various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
To be further described in detail the present invention by specific embodiment below.
Embodiment 1
The present embodiment is for illustrating the production method of soft steel provided by the invention.
The molten iron that uses converter that sulphur content is less than to 0.015 % by weight carries out just refining, top blast pure oxygen 28000 standard cubes m/h when top-bottom blowing, bottom blowing pure argon intensity 0.035Nm
3/ ton molten steel min, argon bottom-blowing 6min after tapping, intensity is 0.2Nm
3/ ton molten steel min, to strengthen stirring before tapping; Blow end point carbon content is 0.06 % by weight, and molten steel oxygen activity content is 400ppm, and tapping liquid steel temperature is 1670 DEG C;
Steel converter adds basicity (CaO/SiO after smelting in tapping process
2weight ratio) be the molten steel slag charge (slag modifier for refining) of 4-5, with the mixed punching of molten steel, add-on is 1.5 kg/ton molten steel, its table composed as follows 2(unit: % by weight):
Table 2
| CaO | Al 2O 3 | MAl | P | S | SiO 2 | H 2O |
| 38-50 | 18-30 | ≥6.0 | ≤0.05 | ≤0.15 | ≤10 | ≤0.5 |
When tapping, carry out pushing off the slag, making FeO in ladle slag and the total content of MnO is 3 % by weight;
After LF stove temperature adjustment processing (temperature is 1620 DEG C of left and right), make molten steel enter RH vacuum unit (Metal Weight is 120 tons) and circulate and carry out successively decarburization and deoxygenated alloy;
When nature decarburization, the molten steel vacuum cycle time is controlled to 20 minutes, pressure 200 handkerchiefs, it is 12 liters/min that argon gas is blown into intensity, making C content is 0.0015 % by weight;
While forcing decarburization, in molten steel, be blown into oxygen, the amount of being blown into of oxygen is 1200 standard cubes m/h, and the molten steel vacuum cycle time is controlled to 10 minutes, and pressure is 10000 handkerchiefs, and it is 18 liters/min that argon gas is blown into intensity, and making C content is 0.0006 % by weight;
Then in the molten steel after decarburization, add aluminum shot reductor and ferro-titanium and ferro-niobium, it is 18 liters/min, molten steel per ton that argon gas is blown into intensity, and pressure is 200 handkerchiefs, and the add-on of aluminum shot reductor is 1.5 kg/ton molten steel, the Als that makes molten steel is 0.06 % by weight, and oxygen activity is 0.002 % by weight; Obtaining C content is 0.0006 % by weight, and Si content is 0.02 % by weight, and Mn content is 0.21 % by weight, and P content is 0.010 % by weight, and S content is 0.010 % by weight, and Ti content is 0.056 % by weight, and Als is the molten steel of 0.06 % by weight, and surplus is iron;
This molten steel is poured into crystallizer and is carried out continuous casting and argon shield is provided in casting process to pull continuously with cooling from tundish; and adding tundish covering flux in being poured in tundish, add-on is the molten steel obtaining after 0.2 kg/ton is smelted.
This embodiment adopts method of the present invention to produce IF trade mark soft steel, IF trade mark soft steel chemical composition Jian Biao 3(unit: % by weight).
Table 3
| C | Si | Mn | P | S | Als | Ti |
| ≤0.003 | ≤0.05 | 0.15-0.40 | ≤0.015 | ≤0.015 | 0.02-0.07 | 0.02-0.08 |
Embodiment 2
The present embodiment is for illustrating the production method of soft steel provided by the invention.
The molten iron that uses converter that sulphur content is less than to 0.015 % by weight carries out just refining, top blast pure oxygen 28000 standard cubes m/h when top-bottom blowing, bottom blowing pure argon intensity 0.035Nm
3/ ton molten steel min, argon bottom-blowing 6min after tapping, intensity is 0.2Nm
3/ ton molten steel min, to strengthen stirring before tapping; Blow end point carbon content is 0.05 % by weight, and molten steel oxygen activity content is 450ppm, and tapping liquid steel temperature is 1670 DEG C;
Steel converter adds basicity (CaO/SiO after smelting in tapping process
2weight ratio) be the slag charge (slag modifier for refining molten steel) of 4-5, with the mixed punching of molten steel, add-on is 1.5 kg/ton molten steel, table composed as follows 4(unit: % by weight):
Table 4
| CaO | Al 2O 3 | MAl | P | S | SiO 2 | H 2O |
| 38-50 | 18-30 | ≥6 | ≤0.05 | ≤0.15 | ≤10 | ≤0.5 |
When tapping, carry out pushing off the slag, making FeO in ladle slag and the total content of MnO is 3 % by weight;
After LF stove temperature adjustment processing (temperature is 1620 DEG C of left and right), make molten steel enter RH vacuum unit (Metal Weight is 120 tons) and circulate and carry out successively decarburization and deoxygenated alloy;
When nature decarburization, the molten steel vacuum cycle time is controlled to 20 minutes, pressure 200 handkerchiefs, it is 12 liters/min that argon gas is blown into intensity, making C content is 0.0015 % by weight;
Then in the molten steel after decarburization, add aluminum shot reductor and ferro-titanium and ferro-niobium, it is 18 liters/min, molten steel per ton that argon gas is blown into intensity, and pressure is 200 handkerchiefs, and the add-on of aluminum shot reductor is 1.5 kg/ton molten steel, the Als that makes molten steel is 0.06 % by weight, and oxygen activity content is 0.002 % by weight; Obtaining C content is 0.0018 % by weight, and Si content is 0.02 % by weight, and Mn content is 0.20 % by weight, and P content is 0.011 % by weight, and S content is 0.010 % by weight, and Ti content is 0.061 % by weight, and Als is the molten steel of 0.06 % by weight, and surplus is iron;
This molten steel is poured into crystallizer and is carried out continuous casting and argon shield is provided in casting process to pull continuously with cooling from tundish; and adding tundish covering flux in being poured in tundish, add-on is the molten steel obtaining after 0.2 kg/ton is smelted.
This embodiment adopts method of the present invention to produce IF trade mark soft steel, IF trade mark soft steel chemical composition Jian Biao 5(unit: % by weight).
Table 5
| C | Si | Mn | P | S | Als | Ti |
| ≤0.003 | ≤0.05 | 0.15-0.40 | ≤0.015 | ≤0.015 | 0.02-0.07 | 0.02-0.08 |
Claims (10)
1. a method for smelting suprelow carbon steel, the method comprises:
(1) molten iron or the half steel that use converter that sulphur content is less than to 0.015 % by weight carry out just refining, then the molten steel that just refining obtains are tapped in ladle;
In tapping process, adding basicity is 4-5, SiO
2the slag charge of content≤20 % by weight; Make FeO in ladle slag and total content≤15 % by weight of MnO;
Described Tapping Temperature of Bof is 1600-1700 DEG C, and blow end point carbon content is 0.04-0.06 % by weight, and oxygen activity is 0.03-0.07 % by weight;
(2) molten steel step (1) being obtained under vacuum condition in RH vacuum unit circulation carry out successively decarburization and deoxidation alloying, the condition of decarburization makes carbon content in molten steel below 30ppm.
2. the method for smelting suprelow carbon steel according to claim 1, wherein, in step (1), the method that described converter is blown is top bottom blowing, described top bottom blowing is top blast oxygen, bottom blowing shielding gas, and the amount of top blast oxygen is 15000-35000 standard cube m/h; The intensity of bottom blowing shielding gas is 0.01-0.1Nm
3/ ton molten steel min.
3. the method for smelting suprelow carbon steel according to claim 1, wherein, in step (2), the method for described decarburization comprises the pressure decarburization that nature decarburization and selectivity are carried out.
4. the method for smelting suprelow carbon steel according to claim 3, wherein, the condition of described natural decarburization comprises: pressure is 0-1000 handkerchief, and it is molten steel 6-15 liter/min per ton that argon gas is blown into intensity, and the time is 15-25 minute;
Preferably, pressure is 0-200 handkerchief, and it is molten steel 10-15 liter/min per ton that argon gas is blown into intensity, and the time is 15-20 minute.
5. the method for smelting suprelow carbon steel according to claim 3, wherein, comprising in molten steel of described pressure decarburization is blown into oxygen, the condition of described pressure decarburization comprises: pressure is 0-10000 handkerchief, the amount of being blown into of oxygen is 800-1600 standard cube m/h, it is molten steel 6-20 liter/min per ton that argon gas is blown into intensity, and the time is 3-15 minute;
Preferably, pressure is 1000-10000 handkerchief, and the amount of being blown into of oxygen is 1200-1400 standard cube m/h, and it is molten steel 6-10 liter/min per ton that argon gas is blown into intensity, and the time is 3-10 minute.
6. the method for smelting suprelow carbon steel according to claim 1, wherein, in step (2), the method of described deoxidation alloying comprises in the molten steel after decarburization and adds aluminum shot reductor and ferro-titanium, [Als] of the add-on control molten steel of aluminum shot reductor is 0.04-0.06 % by weight, oxygen activity≤20ppm; The add-on of ferro-titanium makes the amount of titanium component reach the middle limit that steel grade requires.
7. the method for smelting suprelow carbon steel according to claim 6, wherein, the condition of described deoxidation alloying comprises that pressure is 0-1000 handkerchief, it is molten steel 6-20 liter/min per ton that argon gas is blown into intensity.
8. the method for smelting suprelow carbon steel according to claim 1, wherein, the method is carried out temperature adjustment processing by molten steel, to make the temperature of described molten steel as 1620-1640 DEG C before also comprising that the molten steel that step (1) is obtained enters the circulation of RH vacuum unit.
9. the method for a continuous casting ultra low-carbon steel, the method comprises that the molten steel that smelting is obtained injects tundish and molten steel is poured into crystallizer to be pulled continuously with cooling from tundish, it is characterized in that, the molten steel that described smelting obtains is the molten steel by obtaining according to the method for the smelting suprelow carbon steel described in any one in claim 1-8.
10. the method for continuous casting ultra low-carbon steel according to claim 9, wherein, in Pour Steel process and steel billet is pulled continuously, in process of cooling, provide protection of inert gas to prevent molten steel or steel billet secondary oxidation to molten steel and steel billet.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105316451A (en) * | 2015-11-19 | 2016-02-10 | 攀钢集团西昌钢钒有限公司 | RH forced oxygen blowing decarbonization method and ultra-low-carbon steel smelting method |
| CN105400928A (en) * | 2015-11-13 | 2016-03-16 | 攀钢集团西昌钢钒有限公司 | Ultra-low carbon steel two-step deoxygenation method |
| CN106929633A (en) * | 2017-04-06 | 2017-07-07 | 攀钢集团西昌钢钒有限公司 | A kind of smelting process of ultra-low-carbon steel |
| CN107502704A (en) * | 2017-10-20 | 2017-12-22 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method for reducing alumina inclusion in semi-steel making strand |
| CN107779541A (en) * | 2017-10-25 | 2018-03-09 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of preparation method of semi-steel making strand |
| CN108220533A (en) * | 2017-12-26 | 2018-06-29 | 首钢集团有限公司 | A kind of method for improving IF steel alloy recovery rates |
| CN108330251A (en) * | 2018-05-22 | 2018-07-27 | 湖南华菱湘潭钢铁有限公司 | Process for decarbonizing after a kind of Converter |
| CN108611462A (en) * | 2016-12-12 | 2018-10-02 | 上海梅山钢铁股份有限公司 | A kind of control method of Ultra-low carbon steel inclusion |
| CN109487034A (en) * | 2019-01-02 | 2019-03-19 | 鞍钢股份有限公司 | Method for producing IF steel by composite deoxidation |
| CN109666854A (en) * | 2019-01-15 | 2019-04-23 | 舞阳钢铁有限责任公司 | A kind of smelting process of mild steel |
| CN109880970A (en) * | 2019-03-29 | 2019-06-14 | 包头钢铁（集团）有限责任公司 | A kind of technique promoting IF steel casting sequence |
| CN110699594A (en) * | 2019-10-30 | 2020-01-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting IF steel from semisteel at low cost |
| CN112593142A (en) * | 2020-10-26 | 2021-04-02 | 邯郸钢铁集团有限责任公司 | Low-cost high-purity ultra-low carbon steel strip and production method thereof |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105400928A (en) * | 2015-11-13 | 2016-03-16 | 攀钢集团西昌钢钒有限公司 | Ultra-low carbon steel two-step deoxygenation method |
| CN105316451A (en) * | 2015-11-19 | 2016-02-10 | 攀钢集团西昌钢钒有限公司 | RH forced oxygen blowing decarbonization method and ultra-low-carbon steel smelting method |
| CN108611462A (en) * | 2016-12-12 | 2018-10-02 | 上海梅山钢铁股份有限公司 | A kind of control method of Ultra-low carbon steel inclusion |
| CN108611462B (en) * | 2016-12-12 | 2020-03-27 | 上海梅山钢铁股份有限公司 | Method for controlling inclusions in ultra-low carbon steel |
| CN106929633A (en) * | 2017-04-06 | 2017-07-07 | 攀钢集团西昌钢钒有限公司 | A kind of smelting process of ultra-low-carbon steel |
| CN106929633B (en) * | 2017-04-06 | 2019-01-04 | 攀钢集团西昌钢钒有限公司 | A kind of smelting process of ultra-low-carbon steel |
| CN107502704A (en) * | 2017-10-20 | 2017-12-22 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method for reducing alumina inclusion in semi-steel making strand |
| CN107779541A (en) * | 2017-10-25 | 2018-03-09 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of preparation method of semi-steel making strand |
| CN107779541B (en) * | 2017-10-25 | 2020-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation method of semi-steel steelmaking casting blank |
| CN108220533B (en) * | 2017-12-26 | 2020-03-27 | 首钢集团有限公司 | Method for improving yield of IF steel alloy |
| CN108220533A (en) * | 2017-12-26 | 2018-06-29 | 首钢集团有限公司 | A kind of method for improving IF steel alloy recovery rates |
| CN108330251A (en) * | 2018-05-22 | 2018-07-27 | 湖南华菱湘潭钢铁有限公司 | Process for decarbonizing after a kind of Converter |
| CN109487034A (en) * | 2019-01-02 | 2019-03-19 | 鞍钢股份有限公司 | Method for producing IF steel by composite deoxidation |
| CN109487034B (en) * | 2019-01-02 | 2020-07-17 | 鞍钢股份有限公司 | Method for producing IF steel by composite deoxidation |
| CN109666854A (en) * | 2019-01-15 | 2019-04-23 | 舞阳钢铁有限责任公司 | A kind of smelting process of mild steel |
| CN109880970A (en) * | 2019-03-29 | 2019-06-14 | 包头钢铁（集团）有限责任公司 | A kind of technique promoting IF steel casting sequence |
| CN110699594A (en) * | 2019-10-30 | 2020-01-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting IF steel from semisteel at low cost |
| CN110699594B (en) * | 2019-10-30 | 2021-06-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting IF steel from semisteel at low cost |
| CN112593142A (en) * | 2020-10-26 | 2021-04-02 | 邯郸钢铁集团有限责任公司 | Low-cost high-purity ultra-low carbon steel strip and production method thereof |
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