CN103966387B - Adopt the method for semi-steel making - Google Patents
Adopt the method for semi-steel making Download PDFInfo
- Publication number
- CN103966387B CN103966387B CN201410204752.XA CN201410204752A CN103966387B CN 103966387 B CN103966387 B CN 103966387B CN 201410204752 A CN201410204752 A CN 201410204752A CN 103966387 B CN103966387 B CN 103966387B
- Authority
- CN
- China
- Prior art keywords
- steel
- converter
- half steel
- ladle
- add
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of method adopting semi-steel making, comprise the following steps: vanadium-bearing hot metal is obtained half steel by (a) after vanadium extraction process; B () goes out half steel to ladle, in the process going out half steel, add material in ladle; C () goes out after half steel completes, the half steel in ladle is carried out converter steelmaking.According to the method for employing semi-steel making of the present invention, the thermal source of half steel significantly can be increased.
Description
Technical field
The invention belongs to field of steel metallurgy, specifically, the present invention relates to a kind of method adopting semi-steel making.
Background technology
When adopting vanadium titano-magnetite to smelt, in order to ensure effective utilization of vanadium resource, need to carry out desulfurization and vanadium extraction process to vanadium-bearing hot metal before steel-making.Molten iron after desulfurization and vanadium extraction process is half steel, wherein, containing the carbon of 3.2wt% ~ 3.8wt% and silicon, the manganese of trace (few amount) in half steel.Compared with adopting the converter steelmaking of molten iron, the converter steelmaking of half steel is adopted to there is following difficult point.
(1) slag making difficulty and slagging speed is slow.Adopt the converter steelmaking of common molten iron, because MnO, SiO in slag
2formed by the direct oxidation of Si, Mn element etc. slagging constituent element, so MnO, SiO in slag
2content higher, slag formation condition is better, and the burn-off rate of lime is fast; Adopt the converter steelmaking of half steel, because Si, Mn in half steel (slagging element) have been trace, in order to accelerate the formation of slag, need to rely on additional composite fluxing medium to come supplementary Si, Mn in converting process, but the fusing of composite fluxing medium and lime needs heat absorption and time, therefore, relative to the converter steelmaking adopting common molten iron, adopt the thermodynamic condition in the process of the converter steelmaking of half steel poor, slagging speed is slower.
(2) the few and heat source insufficiency of heating element content in half steel.Although adopt the temperature entering stove half steel before the converter steelmaking of half steel to be 1300 DEG C ~ 1350 DEG C, a little more than common molten iron, but Si, Mn in half steel (heating element) are trace, and the content of C is 3.2wt% ~ 3.8wt% in half steel, 0.7wt% ~ 1.2wt% lower than common molten iron, causes the chemical heat in half steel obviously to reduce.In addition, adopt half steel converter steelmaking process in need to add containing SiO in converter
2and/or the composite fluxing medium of MnO, cause adopting the problem that in the convertor steelmaking process of half steel, thermal source is in short supply more outstanding.Therefore, in the process of converter steelmaking adopting half steel, need to add carbonaceous material in converter using as temperature raising agent to compensate the temperature in steelmaking process.But, carbonaceous material add the quick generation that inhibit (FeO) in slag, larger negative impact is produced to the Fast Slag Melting dephosphorization in converter smelting early stage.Therefore, adopt slag making in the early stage difficulty of the converter steelmaking of half steel large, steel-making terminal blows seriously deeply.
Publication number is the technique that application discloses a kind of oxygen coverter smelting half steel of CN1048563A.This technique is in the process of the converter steelmaking adopting half steel, to use in dual channel oxygen lance after-burning stove CO gas to the method for the temperature in the process increasing converter steelmaking.The oxygen rifle that the method uses manufactures complicated and the life-span is low, simultaneously serious to converter lining damage.
Publication number is a kind of method that application discloses semisteel smelting low-sulfur steel of CN103205524A.This method provide a kind of ferro-silicon that adds in ladle in the process going out half steel to increase the method for half steel thermal source, but in the increase half steel of the disclosure, the cost of the ferro-silicon that the method for thermal source uses is high, economy is bad.
Periodical literature " steel-making converter uses the experimental study of class graphite temperature raising agent " uses the temperature raising of class graphite to be studied to converter steelmaking, this test shows, class graphite temperature raising agent is to the temperature raising Be very effective of convertor steelmaking process, class graphite temperature raising agent per ton can equalising temp 40.7 DEG C, and to slag making, go P, S to have no adverse effect, can meet make steel the requirement of kind and slag splashing technique completely.But add class graphite to need to consume the FeO in slag in convertor steelmaking process, easily cause steel-making initial stage slag slagging slow, process slag " returns dry ".
Therefore, have in converting process owing to adopting the convertor steelmaking process of half steel that acid slagging material is few, slag system constituent element is single and the features such as shortage of heat, this makes to adopt compared with the converter steelmaking process of half steel and the converter steelmaking process of the common molten iron of employing, and having slag difficulty, steel scrap consume the deficiencies such as low.
Summary of the invention
One object of the present invention is to overcome the deficiencies in the prior art, provides a kind of method that can increase the employing semi-steel making of half steel thermal source.
Another object of the present invention is to overcome the deficiencies in the prior art, provides a kind of change slag speed that can improve in steelmaking process, avoids the method for the employing semi-steel making of slag getting dry and raising adding amount of scrap steel.
Another object of the present invention is to overcome the deficiencies in the prior art, provides a kind of method that can improve the employing semi-steel making of dephosphorization efficiency.
Method according to employing semi-steel making of the present invention comprises the following steps: vanadium-bearing hot metal is obtained half steel by (a) after vanadium extraction process; B () goes out half steel to ladle, in the process going out half steel, add material in ladle; C () goes out after half steel completes, the half steel in ladle is carried out converter steelmaking.
According to exemplary embodiment of the present invention, the half steel in step (a) can contain the C of 3.6wt% ~ 4.0wt% and Si and Mn of trace, and half steel temperature can be 1370 DEG C ~ 1400 DEG C.
According to exemplary embodiment of the present invention, in step (b), material can be added when going out the half steel of at least 1/5 to ladle in ladle, and can go out to ladle to nearly 1/2 half steel time add material.
According to exemplary embodiment of the present invention, in step (b), described material can be made up of the C of Si, 15wt% of 50wt% ~ 65wt% ~ 28wt% and inevitable impurity.
According to exemplary embodiment of the present invention, in step (b), can with 3kg/t
half steel~ 7kg/t
half steelamount in ladle, add material.
According to exemplary embodiment of the present invention, in step (c), can also be included in before bessemerizing with 40kg/t
steel~ 80kg/t
steelamount in converter, add steel scrap.
According to exemplary embodiment of the present invention, in step (c), converter can also be included in when starting to blow, slag making materials is added in converter, described slag making materials can be made up of quickened lime, high magnesium lime and composite fluxing medium, wherein, and can with 20kg/t
steel~ 35kg/t
steelamount in converter, add quickened lime, can with 20kg/t
steel~ 30kg/t
steelamount in converter, add high magnesium lime, can be not more than 10kg/t
steelamount in converter, add composite fluxing medium.
According to exemplary embodiment of the present invention, the moiety of quickened lime can be the CaO of 86wt% ~ 92wt% and inevitable impurity, the moiety of high magnesium lime can be MgO and the inevitable impurity of CaO, 35wt% ~ 45wt% of 40wt% ~ 50wt%, and the moiety of composite fluxing medium can be the SiO of 45wt% ~ 65wt%
2, the ferriferous oxide of MnO, 25wt% ~ 45wt% of 4wt% ~ 10wt% and inevitable impurity.
According to exemplary embodiment of the present invention, in step (c), in the process of converter steelmaking, the oxygen supply intensity controlling oxygen rifle can be 3.2m
3/ (mint
steel) ~ 4m
3/ (mint
steel), oxygen pressure can be 0.8MPa ~ 0.9MPa.
According to exemplary embodiment of the present invention, before converter steelmaking, the half steel be blended in converter steelmaking can contain the Si of C and the 0.1wt% ~ 0.3wt% of 3.2wt% ~ 3.8wt%, and the temperature of half steel can be 1300 DEG C ~ 1350 DEG C.
According to the method for semi-steel making of the present invention, by adding material in the tapping process of half steel in ladle, significantly can increase the thermal source of half steel in convertor steelmaking process, improve the change slag speed in semi-steel making early stage, reduce returning dry and improving the add-on of steel scrap in the process of semi-steel making of slag.In addition, the increase of half steel thermal source and the slag former that adds in converter in the process of semi-steel making also can improve the dephosphorization efficiency of semi-steel making.
Embodiment
Have in converting process owing to adopting the process of semi-steel making that acid slagging material is few, slag system constituent element is single and the features such as shortage of heat, this makes to adopt compared with the technique of semi-steel making and the process for making of the common molten iron of employing, and having slag difficulty, steel scrap consume the deficiencies such as low.Instant invention overcomes the deficiencies in the prior art, by adding the temperature that material improves steelmaking process in the process going out half steel to ladle in ladle.In addition, by selecting the add-on of suitable material and joining day, selecting suitable slag former, steel-making Fast Slag Melting in early stage can also be promoted, avoid slag getting dry and increase the consumption of steel scrap, there is good economic benefit.In addition, material add the add-on also reducing composite fluxing medium in steelmaking process, also improve dephosphorization rate simultaneously.
Be described in detail below in conjunction with the method for exemplary embodiment to the converter steelmaking of employing half steel of the present invention.In the present invention, if do not have the statement made an exception, then in the material usually mentioned, the content of each element or composition is all weight percentage (representing with " wt% ").
First, vanadium-bearing hot metal is obtained half steel after vanadium extraction process.
Specifically, just smelt iron after water, because in molten iron, content of vanadium is higher containing coulsonite by blast furnace, therefore need to carry out vanadium extraction process to entering the molten iron before converter steelmaking, to make the vanadium in molten iron enter slag phase, thus obtain the molten iron of the content with lower vanadium, i.e. half steel.Can carry out vanadium extraction process in converter extracting vanadium according to vanadium-bearing hot metal of the present invention, the half steel obtained after vanadium extraction process can contain the C of 3.6wt% ~ 4.0wt% and Si and Mn of trace, and half steel temperature can be 1370 DEG C ~ 1400 DEG C.
Secondly, go out half steel to ladle, and in ladle, add material in the process going out half steel to ladle.
Specifically, the thermal source in the process of semi-steel making is adopted to form primarily of physical thermal and chemical heat, wherein, physical thermal mainly comprises the heat contained by half steel poured into after vanadium extraction process in converter, and chemical heat mainly comprises the heating slagging elements such as Si, Mn in half steel and C element in the process of bessemerizing through heat that redox reaction discharges.In the process of vanadium extraction process, the Si contained in vanadium-bearing hot metal, the heating such as Mn slagging element is oxidized and enter slag phase, cause the Si in the half steel after vanadium extraction process, the heating such as Mn slagging element has been trace, and the content of C in half steel is lower than the content (the content 0.7wt% ~ 1.2wt% lower than the content of the C in common molten iron of the C in half steel) of the C in common molten iron, although the half steel temperature entering stove is a little more than the charging temperature of common molten iron, (charging temperature of common molten iron is generally and is not less than 1250 DEG C, the half steel temperature obtained after vanadium extraction process is 1370 DEG C ~ 1400 DEG C, enter at half steel in the process of converter and make due to temperature loss the temperature of the half steel entered in converter be reduced to 1300 DEG C ~ 1350 DEG C), but chemical heat obviously reduces.Therefore, above-mentioned situation result in adopt semi-steel making process in half steel heat source insufficiency.In this case, in ladle, material is added according in the process going out half steel to ladle of the present invention, the content of the silicon in half steel can be improved like this, the generation of the phenomenon that the terminal of the steel-making caused because content is few to avoid the heating slagging element in half steel blows deeply (namely in BOF Steelmaking Endpoint molten steel the content of C lower than the content of predetermined C), raisingization slag speed.But the present invention is not limited to this, that is, half steel can be gone out to other steelmaking equipments such as half cylinder of steels.
According to exemplary embodiment of the present invention, preferably, material can add in ladle when at least going out the half steel of 1/5 (20wt%) to ladle, and add when going out the half steel to nearly 1/2 (50wt%) to ladle, material can be made like this to be stirred fully by the half steel in ladle in the process going out half steel to ladle, to make material rapid melting in ladle, thus the change slag speed in converter steelmaking early stage can be improved.
According to exemplary embodiment of the present invention, the moiety of the material added in ladle is the Si of 50wt% ~ 65wt%, the C of 15wt% ~ 28wt% and inevitable impurity, this material has lower fusing point (melting temperature is 1310 DEG C ~ 1340 DEG C), and material can fully all melt by the half steel temperature (1340 DEG C ~ 1370 DEG C) in ladle, significantly improve the content of the heating slagging element in half steel, and the content of the appropriate Si in half steel also effectively can improve the change slag speed in converter steelmaking early stage, be beneficial to the slag in advance in convertor steelmaking process and fully change slag, thus the dephosphorization rate of the converter steelmaking adopting half steel can be improved.In addition, the ferro-silicon that adds in ladle in the process going out half steel to ladle of the present invention and prior art has lower smelting cost compared with the Semi-steel making method improving heating element content in half steel.
According to exemplary embodiment of the present invention, preferably, can with 3kg/t
steel~ 7kg/t
steelamount in ladle, add material, but the present invention is not limited to this.
Then, the half steel adding material in ladle is carried out converter steelmaking, thus obtains molten steel.
Specifically, after joining the fusing of the material in ladle, the half steel in ladle is blended into converter, to carry out Oxygen Furnace Steel operation.
According to exemplary embodiment of the present invention, the half steel before converter steelmaking can contain the Si of C and the 0.1wt% ~ 0.3wt% of 3.2wt% ~ 3.8wt%, and the temperature of the half steel before converter steelmaking can be 1300 DEG C ~ 1350 DEG C.
According to exemplary embodiment of the present invention, preferably, before bessemerizing, can with 40kg/t
steel~ 80kg/t
steelamount in converter, add steel scrap, to reduce steel-making cost.
According to exemplary embodiment of the present invention, when bessemerizing, can add slag making materials in converter, described slag making materials can be made up of quickened lime, high magnesium lime and composite fluxing medium, wherein, and can with 20kg/t
steel~ 35kg/t
steelamount add in converter quickened lime, can with 20kg/t
steel~ 30kg/t
steelamount in converter, add high magnesium lime, and according to the basicity control overflow of actual slag, can be not more than 10kg/t
steelamount in converter, add composite fluxing medium, the dephosphorization rate of molten steel can be improved like this.
According to exemplary embodiment of the present invention, the moiety of quickened lime can be the CaO of 86wt% ~ 92wt% and inevitable impurity, the moiety of high magnesium lime can be the MgO of CaO and the 35wt% ~ 45wt% of 40wt% ~ 50wt% and inevitable impurity, and composite fluxing medium can by SiO
2material, containing MnO material, ferriferous oxide and inevitable impurity composition, wherein, the moiety of composite fluxing medium can be the SiO of 45wt% ~ 65wt%
2, the ferriferous oxide of MnO, 25wt% ~ 45wt% of 4wt% ~ 10wt% and inevitable impurity, but the present invention is not limited to this.
According to exemplary embodiment of the present invention, the oxygen supply intensity of the oxygen rifle in convertor steelmaking process can be 3.2m
3/ (mint
steel) ~ 4m
3/ (mint
steel), oxygen pressure can be 0.8MPa ~ 0.9MPa, can shorten carrying out the slag time and improving dephosphorization rate of converter steelmaking like this.
According to exemplary embodiment of the present invention, before converter steelmaking, the half steel be blended in converter steelmaking can contain the Si of C and the 0.1wt% ~ 0.3wt% of 3.2wt% ~ 3.8wt%, the temperature of half steel can be 1300 DEG C ~ 1350 DEG C, physical thermal and the chemical heat of the half steel be blended in converter can be ensured like this, promote the rapid melting of slag, avoid the generation of molten steel over-blowing phenomenon in the process of converter steelmaking.In addition, increase the content of the heating slagging elements Si in half steel, the add-on of steel scrap in the process adopting semi-steel making can also be improved, reduce smelting cost.
As mentioned above, according to the method for employing semi-steel making of the present invention, by adding lower-cost material in the process going out half steel to ladle in ladle, can promote at semisteel converter steelmaking Fast Slag Melting in early stage, increase steelmaking process temperature, increase steel scrap consumption, there is good economic benefit.In addition, steady according to the steelmaking process of the method for semi-steel making of the present invention, avoid slag getting dry, reduce the add-on of composite fluxing medium in semisteel converter steelmaking process and improve dephosphorization rate.
The present invention is described in detail below with reference to specific embodiment.
Embodiment 1
The temperature that hot metal containing V-Ti carries out through converter extracting vanadium the half steel that vanadium extraction process obtains is 1391 DEG C, and the moiety of half steel is the Mn of Si and 0.039wt% of C, 0.013wt% of 3.69wt%, and surplus is Fe and inevitable impurity.Then go out half steel to ladle, go out to ladle to 1/5 half steel time, with 5kg/t
half steelamount start to add material in ladle, and go out to ladle to reach 1/2 half steel time, material all joins in ladle, wherein, the moiety of material is the C of Si and 15wt% of 65wt%, and surplus is inevitable impurity, the temperature of the half steel obtained is 1350 DEG C, now, the moiety of half steel is the Mn of Si and 0.037wt% of C, 0.19wt% of 3.59wt%, and surplus is Fe and inevitable impurity.Half steel in ladle is blended into steel-making converter, and with 80kg/t
steelamount in converter, add steel scrap, lower oxygen rifle start blowing, oxygen blast pressure is 0.89Mpa, and oxygen supply intensity is 3.34m
3/ (mint
steel).Oxygen rifle starts oxygen blown while, with 34.9kg/t
steelamount in converter, add the quickened lime of the CaO containing 86wt%, with 28.7kg/t
steelamount in converter, add the high magnesium lime of the MgO of CaO and 35wt% containing 40wt%, and with 8.9kg/t
steelamount in converter, add SiO containing 45wt%
2, 4wt% the composite fluxing medium of ferriferous oxide of MnO and 25wt%.This steel-making heat terminates, and the index evaluating its steel-making effect is: it is 2.1min that steel-making carrys out the slag time, dephosphorization rate 89%, and steelmaking process is steady, does not occur returning dry.
embodiment 2
The temperature that hot metal containing V-Ti carries out through converter extracting vanadium the half steel that vanadium extraction process obtains is 1384 DEG C, and the moiety of half steel is the Mn of Si and 0.034wt% of C, 0.011wt% of 3.78wt%, surplus is Fe and inevitable impurity, then goes out half steel to ladle.Go out to ladle to 1/4 half steel time, with 3kg/t
half steelamount start to add material in ladle, and go out to ladle to reach 1/2 half steel time, material all joins in ladle, wherein, the moiety of material is the C of Si, 22wt% of 55wt%, and surplus is inevitable impurity, the half steel temperature obtained is 1353 DEG C, now, the moiety of half steel is the Mn of Si and 0.035wt% of C, 0.29wt% of 3.78wt%, and surplus is iron and inevitable impurity.Half steel in ladle is blended into steel-making converter, and with 60kg/t
steelamount in converter, add steel scrap, lower oxygen rifle start blowing, oxygen blast pressure is 0.86Mpa, and oxygen supply intensity is 3.65m
3/ (mint
steel).Oxygen rifle starts oxygen blown while, with 21.3kg/t
steelamount in converter, add the quickened lime of the CaO containing 89wt%, with 20.9kg/t
steelamount in converter, add the high magnesium lime of the MgO of CaO and 40wt% containing 45wt%.This steel-making heat terminates, and the index evaluating its steel-making effect is: it is 1.9min that steel-making carrys out the slag time, and dephosphorization rate is 88wt%, and steelmaking process is steady, does not occur returning dry.
embodiment 3
The temperature that hot metal containing V-Ti carries out through converter extracting vanadium the half steel that vanadium extraction process obtains is 1372 DEG C, and the moiety of half steel is the Mn of Si and 0.036wt% of C, 0.015wt% of 3.92wt%, surplus is Fe and inevitable impurity, then goes out half steel to ladle.Go out to ladle to 1/3 half steel time, with 4kg/t
half steelamount start to add material in ladle, and go out to ladle to reach 1/2 half steel time, material all joins in ladle, wherein, the moiety of material is the C of Si and 27wt% of 52wt%, and surplus is inevitable impurity, the half steel temperature obtained is 1368 DEG C, now, the moiety of half steel is the Mn of Si and 0.033wt% of C, 0.21wt% of 3.74wt%, and surplus is Fe and inevitable impurity.Half steel in ladle is blended into steel-making converter, and with 42kg/t
steelamount in converter, add steel scrap, lower oxygen rifle start blowing, oxygen blast pressure is 0.81Mpa, and oxygen supply intensity is 3.87m
3/ mint
steel.Oxygen rifle starts oxygen blown while, with 28.4kg/t
steelamount in converter, add the quickened lime of the CaO containing 92wt%, with 25.2kg/t
steelamount in converter, add the high magnesium lime of the MgO of CaO and 45wt% containing 50wt%, with 6.3kg/t
steelamount in converter, add SiO containing 65wt%
2, 6wt% the composite fluxing medium of ferriferous oxide of MnO and 35wt%.This steel-making heat terminates, and the index evaluating its steel-making effect is: it is 2.3min that steel-making carrys out the slag time, and dephosphorization rate is 87%, and steelmaking process is steady, does not occur returning dry.
comparative example
Hot metal containing V-Ti carries out vanadium extraction process through converter extracting vanadium, the temperature of the half steel obtained is 1391 DEG C, and the moiety of half steel is the Mn of Si and 0.033wt% of C, 0.012wt% of 3.79wt%, surplus is Fe and inevitable impurity, then goes out half steel to ladle.Go out after half steel completes, half steel is blended into steel-making converter, and with 31kg/t
steelamount in converter, add steel scrap and with 2.1kg/t
steelamount in converter, add class graphite, lower oxygen rifle start blowing, oxygen blast pressure 0.89Mpa, oxygen supply intensity 3.84m
3/ (mint
steel).Oxygen rifle starts oxygen blown while, with 30.8kg/t
steelamount in converter, add the quickened lime of the CaO containing 80wt%, with 27.7kg/t
steelamount in converter, add the high magnesium lime of the MgO of CaO and 40wt% containing 40wt%, with 18.9kg/t
steelamount in converter, add SiO containing 40wt%
2, 4wt% the composite fluxing medium of ferriferous oxide of MnO and 30wt%, this steel-making heat terminates, and the index evaluating its steel-making effect is: it is 4.2min that steel-making carrys out the slag time, and dephosphorization rate is 81%, and steelmaking process returns dry 1.3min.
According to various embodiments of the present invention compared with the comparative example of prior art, use the method for employing semi-steel making of the present invention can improve in smelting process carry out slag speed and change slag rapid, slag state can be controlled preferably, smelting process operation is more steady, slag dephosphorization efficiency is higher than existing technique, and steel scrap consumption can be greatly improved.In addition, use material of the present invention while the content improving heating element in half steel, significantly can reduce the usage quantity of production cost and reduction composite fluxing medium.
To sum up, by adding material in the tapping process of half steel to ladle in ladle, to increase the temperature of semi-steel making process.In addition, by selecting the add-on of suitable material and joining day, selecting suitable slag former, the Fast Slag Melting in early stage adopting semi-steel making can also be promoted, avoid slag getting dry and add the consumption of steel scrap, there is good economic benefit.In addition, material add the add-on also reducing composite fluxing medium in steelmaking process, also improve dephosphorization rate simultaneously.
Claims (8)
1. adopt a method for semi-steel making, wherein, said method comprising the steps of:
A vanadium-bearing hot metal is obtained half steel by () after vanadium extraction process;
B () goes out half steel to ladle, in ladle, material is added in the process going out half steel, wherein, described material by Si, 15wt% ~ 28wt% of 50wt% ~ 65wt% C and inevitably impurity form, and the add-on of material is 3kg/t
half steel~ 7kg/t
half steel;
C () goes out after half steel completes, the half steel in ladle is carried out converter steelmaking.
2. the half steel the method for claim 1, wherein in step (a) contains the C of 3.6wt% ~ 4.0wt% and Si and Mn of trace, and half steel temperature is 1370 DEG C ~ 1400 DEG C.
3., the method for claim 1, wherein in step (b), in ladle, add material when going out the half steel of at least 1/5 to ladle, and go out to ladle to nearly 1/2 half steel time add material.
4., the method for claim 1, wherein in step (c), be also included in before bessemerizing with 40kg/t
steel~ 80kg/t
steelamount in converter, add steel scrap.
5., the method for claim 1, wherein in step (c), be also included in converter when starting to blow, in converter, add slag making materials, described slag making materials is made up of quickened lime, high magnesium lime and composite fluxing medium, wherein, with 20kg/t
steel~ 35kg/t
steelamount in converter, add quickened lime, with 20kg/t
steel~ 30kg/t
steelamount in converter, add high magnesium lime, to be not more than 10kg/t
steelamount in converter, add composite fluxing medium.
6. method as claimed in claim 5, wherein, the moiety of quickened lime is the CaO of 86wt% ~ 92wt% and inevitable impurity, the moiety of high magnesium lime is MgO and the inevitable impurity of CaO, 35wt% ~ 45wt% of 40wt% ~ 50wt%, and the moiety of composite fluxing medium is the SiO of 45wt% ~ 65wt%
2, the ferriferous oxide of MnO, 25wt% ~ 45wt% of 4wt% ~ 10wt% and inevitable impurity.
7., the method for claim 1, wherein in step (c), in the process of converter steelmaking, the oxygen supply intensity controlling oxygen rifle is 3.2m
3/ (mint
steel) ~ 4m
3/ (mint
steel), oxygen pressure is 0.8MPa ~ 0.9MPa.
8. the method for claim 1, wherein before converter steelmaking, the half steel be blended in converter contains the Si of C and the 0.1wt% ~ 0.3wt% of 3.2wt% ~ 3.8wt%, and the temperature of half steel is 1300 DEG C ~ 1350 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410204752.XA CN103966387B (en) | 2014-05-15 | 2014-05-15 | Adopt the method for semi-steel making |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410204752.XA CN103966387B (en) | 2014-05-15 | 2014-05-15 | Adopt the method for semi-steel making |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103966387A CN103966387A (en) | 2014-08-06 |
| CN103966387B true CN103966387B (en) | 2016-01-06 |
Family
ID=51236387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410204752.XA Expired - Fee Related CN103966387B (en) | 2014-05-15 | 2014-05-15 | Adopt the method for semi-steel making |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103966387B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104789732B (en) * | 2015-05-20 | 2016-09-07 | 攀钢集团攀枝花钢铁研究院有限公司 | The method of semi-steel making converter slag-making |
| CN106048128B (en) * | 2016-08-15 | 2018-04-20 | 攀钢集团西昌钢钒有限公司 | It is a kind of to prevent semi-steel making converter dry dust pelletizing system from opening to be blown off quick-fried method |
| CN108823351A (en) * | 2018-07-04 | 2018-11-16 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of semisteel smelting improves the method and method for making steel of converter scrap ratio |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696462A (en) * | 2009-11-03 | 2010-04-21 | 攀钢集团研究院有限公司 | Method for producing low phosphorus steel by smelting semisteel |
| CN102312036A (en) * | 2010-07-06 | 2012-01-11 | 攀钢集团钢铁钒钛股份有限公司 | Steelmaking and slagging method |
| CN103205524A (en) * | 2013-04-15 | 2013-07-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting low-sulfur steel from semi-steel |
| CN103627839A (en) * | 2013-11-13 | 2014-03-12 | 攀钢集团研究院有限公司 | Semisteel steelmaking carbon content control method and semisteel steelmaking method |
| CN103627842A (en) * | 2013-11-14 | 2014-03-12 | 攀钢集团研究院有限公司 | Method for enhancing end point carbon content in smelting medium-carbon steel from semisteel and semisteel steelmaking method |
-
2014
- 2014-05-15 CN CN201410204752.XA patent/CN103966387B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696462A (en) * | 2009-11-03 | 2010-04-21 | 攀钢集团研究院有限公司 | Method for producing low phosphorus steel by smelting semisteel |
| CN102312036A (en) * | 2010-07-06 | 2012-01-11 | 攀钢集团钢铁钒钛股份有限公司 | Steelmaking and slagging method |
| CN103205524A (en) * | 2013-04-15 | 2013-07-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting low-sulfur steel from semi-steel |
| CN103627839A (en) * | 2013-11-13 | 2014-03-12 | 攀钢集团研究院有限公司 | Semisteel steelmaking carbon content control method and semisteel steelmaking method |
| CN103627842A (en) * | 2013-11-14 | 2014-03-12 | 攀钢集团研究院有限公司 | Method for enhancing end point carbon content in smelting medium-carbon steel from semisteel and semisteel steelmaking method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103966387A (en) | 2014-08-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105525055B (en) | A kind of control method of converter less-slag melting carbon period splash | |
| CN101696462A (en) | Method for producing low phosphorus steel by smelting semisteel | |
| CN103627842B (en) | Method for enhancing end point carbon content in smelting medium-carbon steel from semisteel and semisteel steelmaking method | |
| CN103789483B (en) | Method for smelting low-phosphorus steel by using semi-steel | |
| CN101962698A (en) | Semisteel converter steelmaking method | |
| CN105671248A (en) | Smelting method of converter efficient dephosphorization | |
| CN110938726A (en) | Method for smelting low-phosphorus molten steel by converter | |
| CN103642971A (en) | Method for improving steelmaking end-point carbon content of semisteel and semisteel steelmaking method | |
| CN103146873A (en) | Enriching sludge ball for semisteel steelmaking and slagging method for semisteel steelmaking | |
| CN103966387B (en) | Adopt the method for semi-steel making | |
| CN103642966B (en) | Method for improving high-carbon high-manganese steel converter smelting endpoint carbon content and steelmaking method | |
| CN105132611A (en) | Method for producing ultra-low phosphorous steel through single slag of converter | |
| CN103627846A (en) | Method for performing direct alloying to molybdenum oxide for steelmaking | |
| CN104060020B (en) | A kind of dephosphorization method for making steel improving converter terminal molten steel Fe content | |
| CN103627839A (en) | Semisteel steelmaking carbon content control method and semisteel steelmaking method | |
| CN104109727B (en) | The method of half steel converter smelting Low-phosphorus Steel | |
| CN110699511A (en) | Method for smelting high-silicon molten iron | |
| CN103627851A (en) | Semisteel steelmaking temperature control method and semisteel steelmaking method | |
| CN103409595A (en) | Dephosphorization and steel-making method of vanadium-containing molten iron | |
| CN110527786B (en) | Method for directly alloying and steelmaking by using manganese ore in converter | |
| CN103643094A (en) | Smelting method of high-carbon ferromanganese | |
| CN104805249B (en) | Double slags stay the slagging method of slag semi-steel making | |
| CN107557517A (en) | A kind of method using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage | |
| CN103993119B (en) | A kind of method of half steel slag making | |
| CN105483316A (en) | Direct alloying method of chrome ores in converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160106 Termination date: 20170515 |