CN103397135B - Recarburization technology for converter short-flow steelmaking - Google Patents
Recarburization technology for converter short-flow steelmaking Download PDFInfo
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- CN103397135B CN103397135B CN201310336690.3A CN201310336690A CN103397135B CN 103397135 B CN103397135 B CN 103397135B CN 201310336690 A CN201310336690 A CN 201310336690A CN 103397135 B CN103397135 B CN 103397135B
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Abstract
A disclosed recarburization technology for converter short-flow steelmaking comprises: during steel tapping, by employing a semi-deoxidization technology and taking carbon-manganese alloy ball as a catalyst, molten steel is subjected to alloying as well as recarburization. According to the recarburization technology, the conventional technology of recarburizing after deoxidation alloying is changed, and the problem in the conventional technology is solved that carbon is large in yield fluctuation. Also, the recarburization technology has no influence on casting blank quality by employing carbon-manganese alloy ball for recarburization and alloying of manganese, and is capable of completely satisfying casting blank control requirements on P, S and inclusions.
Description
Technical field
The present invention relates to the smelting of steel, particularly relate to a kind of recarburization process of converter mini-mill steelmaking.
Background technology
In order to adjust the carbon content of steel grade, to reach steel grade specification requirement, in the smelting process of steel, usually need the carburetting carrying out molten steel.Conventional carburelant has the carburetting pig iron, electrode powder, petroleum coke powder, wood charcoal powder, coke powder and hard coal etc.Usually, converter adopts hard coal carburelant to perform recarburization process, and its operating procedure is: in tapping process, adds hard coal and perform recarburization process after execution deoxidation alloying in ladle.Because the carburelant proportions such as hard coal are comparatively light, not easily enter molten steel, steel grade carbon content usually occurs in adding procedure lower than steel grade lower limit or the situation higher than the steel grade upper limit, easily cause steel mill's kind to be smelt rate low.In addition, adopt the carburelants such as hard coal, the proportion of carburelant is little, in addition granularity is uneven, and in launch process, powdered granule carburetting material contacts with air at high operating temperatures and is oxidized, oarse-grained carburelant material can not be absorbed by molten steel in time, makes carbon yield low thus.
To sum up, there is the problems such as carburelant fusing is incomplete, recovery rate is unstable, the LFization slag time is long, electric power consumption per ton steel is high in the technique that converter adopts the carburelants such as hard coal to carry out carburetting.When multiple side's casting machine is produced simultaneously, electrically heated organization of production difficulty, therefore part steel grade must adopt short route, accurately joins carbon, improve steel grade and be smelt rate, need to improve existing recarburization process for what ensure short route steel.
Summary of the invention
The technical problem that the present invention solves is the recarburization process providing a kind of converter mini-mill steelmaking, joins carbon exactly by adding carbon manganese alloy carburelant coordinate semi deoxidized technique to realize mini-mill steelmaking in tapping process in molten steel simultaneously.
In order to solve the problems of the technologies described above, according to the present invention, provide a kind of recarburization process of converter mini-mill steelmaking, it comprises: in tapping process, adopt semi deoxidized technique, use carbon manganese alloy ball as carburelant, thus while to molten steel recarburization, alloying is carried out to molten steel.
According to an aspect of the present invention, described semi deoxidized technique comprises: according to the oxygen level in molten steel, when not adding or part adds deoxidation material, adds described carburelant.
According to one embodiment of present invention, in semi deoxidized technique, as 600ppm≤endpoint molten steel oxygen activity < 1000ppm or 0.03wt%≤molten steel terminal C content≤0.05wt%, in molten steel, do not add deoxidation material carry out pre-deoxidation, add described carburelant when tapping 1/3, before tapping 2/3, complete alloying.According to another embodiment of the present invention, in described semi deoxidized technique, as endpoint molten steel oxygen activity < 600ppm or molten steel terminal C content > 0.05wt%, add part deoxidation material, add described carburelant when tapping 1/4.According to one exemplary embodiment of the present invention, deoxidation material can be carbon element deoxidation material.
According to an aspect of the present invention, described carbon manganese alloy ball can be made up of following material by weight: the Mn of C, 35-45 weight part of 32-43 weight part, be no more than weight part P, be no more than 0.2 weight part S, be no more than the N of 0.2 weight part, be no more than the H of 1.5 weight parts
2o.According to a preferred embodiment of the invention, the N in carbon manganese alloy ball is no more than 0.1 weight part, H
2o is no more than 0.5 weight part.
According to an aspect of the present invention, the particle diameter of carbon manganese alloy ball can be 5mm-15mm, and it is not broken that carbon manganese alloy ball freely falls to rigid surface from 2 meters of eminences.
According to an aspect of the present invention, the omnidistance on-line argon-blow of tapping process, adopt slag-stopping tapping technique, the thickness that can control ladle slag is no more than 70mm.
According to an aspect of the present invention, described carbon manganese alloy ball can be made up of carbon materials and manganese alloy material, and wherein, manganese alloy material can be at least one in the group during silicomanganese and high carbon ferromanganese form.According to an aspect of the present invention, in alloying process, when determining that the Fe content in molten steel does not reach the Fe content of expectation, can also add manganese alloy in molten steel, wherein, manganese alloy can be selected from least one in silicomanganese and high carbon ferromanganese.
According to an aspect of the present invention, the add-on of above-mentioned manganese alloy can be calculated according to limit in institute steelmaking kind Mn specification.
According to an aspect of the present invention, the add-on of carbon manganese alloy ball carburelant can calculate by carbon, manganese yield 89%-93%.
The present invention changes the technique of traditional first deoxidation alloying carburetting again, and solve carbon recovery rate that existing recarburization process exists and to fluctuate large problem, carbon, manganese element recovery rate are stable.In addition, according to the present invention, the alloying technology adopting carbon manganese ball to carry out carburetting and manganese without impact, can meet strand P, S and Control and Inclusion Removal requirement on slab quality completely.Meanwhile, use carbon manganese carburelant to replace hard coal carburelant and high carbon ferromanganese, ton steel new returns 0.57 yuan, reduce production cost.
Embodiment
Embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
Usually, when utilizing converter steelmaking, first perform furnace charge carried out in the stove of oxidizing atmosphere melt, dephosphorization, decarburization and master alloying etc. just refine process, wherein, in the process of bessemerizing, due to constantly to metal pool oxygen blast, when blowing reaches terminal, the dissolved oxygen of residual some amount in molten steel.After bessemerizing end, if not by oxygen removal to a certain extent, just can not cast smoothly, strand rational in infrastructure can not be obtained.Therefore, before tapping or in tapping and later process thereof, can require to select suitable reductor and add-on thereof according to steel grade, join in molten steel the deoxidation degree making it reach to conform with the regulations.While deoxidation, silicon, manganese and other alloying elements can be added in molten steel, while deoxidation, adjust the requirement of content steelmaking kind to meet of above-mentioned alloy, reach the object of alloying.
Degassed, deoxidation, desulfurization can be carried out in the container of vacuum, rare gas element or reducing atmosphere, removal of inclusions and alloying etc. through the molten steel of just refining.Existing technique is in the deoxidation of tapping process interalloy, carburetting to target value, alloying, then carries out vacuum-treat, degassed, removal part inclusion, fine setting alloy to molten steel.Deoxidization technique, after converter tapping, carries out necessary decarburization and degassed process at RH device, then adopts aluminum steel to carry out final deoxygenation as reductor to molten steel and makes molten steel calm, and then carry out the adjustment of other compositions.Existing technique needs repeatedly to add multiple reductor, and the Al generated
2o
3be mixed in vacuum cycle process and not easily remove, cause lingering section Al in steel
2o
3be mingled with.In other words, at present in convertor steelmaking process, adopt first deoxidation alloying to add carburelant again and carry out carburetting, with the carbon content making molten steel reach expectation.But there is the problem such as long flow path, recovery rate instability in current this recarburization process.
For this reason, according to the present invention, propose and a kind of adopt semi deoxidized and carbon manganese alloy to match incompatiblely to carry out short route carburetting.Specifically, according to the present invention, adopt semi deoxidized technique, use carbon manganese alloy ball as carburelant, thus while to molten steel recarburization, alloying is carried out to molten steel.Semi deoxidized technique refers in tapping process, according to the oxygen level in molten steel, do not adding or partly adding deoxidation material (such as, carbon element deoxidation material) when add carburelant, [O] in itself and molten steel is reacted, generate the molten steel in CO bubble agitation ladle, force the mass transfer of carburelant in ladle and fusing, thus change the technique of traditional first deoxidation alloying carburetting again.In other words, in the present invention, " semi deoxidized technique " refers in tapping process, and first add part pre-deoxidation material and alloy material, next adds carburelant, finally adds the deoxidation alloying process of alloy.Oxygen and carbon contained by before utilizing deoxidation of molten steel react the CO bubble produced and impel molten steel appropriateness to seethe, and are that dynamic conditions is created in carburelant fusing, thus reach the object of fusing carburelant, alloy.
In addition, gently, not easily enter this shortcoming of molten steel for carburelant quality such as hard coals, in the present invention, make carbon manganese alloy ball as carburelant with carbon materials and manganese alloy, can enter in molten steel with the density increasing carburelant, thus also can carry out alloying of manganese while carburetting.According to the present invention, the carbon manganese alloy ball as carburelant is made up of following material by weight: the Mn of C, 35-45 weight part of 32-43 weight part, be no more than 0.15 weight part P, be no more than 0.2 weight part S, be no more than the N of 0.2 weight part, be no more than the H of 1.5 weight parts
2o.According to the present invention, the add-on of carbon manganese alloy carburelant calculates according to limitting in institute steelmaking kind C, Mn specification.
According to the present invention, carbon manganese alloy carburelant can adopt carbon materials and manganese alloy material to make, wherein, carbon materials can be selected from carbonaceous material disclosed in the prior art such as graphite, hard coal one or more, manganese alloy material can select in the manganese alloy such as silicomanganese, high carbon ferromanganese one or more; Above-mentioned carbon materials and above-mentioned manganese alloy material are carried out proportioning according to the component concentration of above-mentioned carbon manganese alloy carburelant, and through be pulverized and mixed, bond make target particles shape, size carbon manganese alloy ball as carburelant.
According to the present invention, carbon manganese alloy carburelant is spherical, and its particle diameter is preferably 5mm-15mm, and it is not broken that carbon manganese alloy carburelant freely falls to rigid surface from 2 meters of eminences.
According to the present invention, reduce the H in carbon manganese alloy carburelant
2o, N equal size can improve the purity of made steel water, therefore, controls the H in above-mentioned carbon manganese alloy carburelant further
2o, N equal size, preferably, the gross weight based on carbon manganese alloy carburelant is 100 parts, controls N≤0.1 weight part, H in carbon manganese alloy carburelant
2o≤0.5 weight part, to carry out recarburization process to molten steel.
In addition, in the present invention, the add-on of carbon manganese alloy ball carburelant can calculate by the 89%-93% of carbon, manganese yield, and concrete add-on can be determined according to molten steel composition and technique.In addition, according to the present invention, when the Fe content in molten steel is not enough, manganese alloy can be added to molten steel and supply.According to one embodiment of present invention, the add-on of manganese alloy can calculate according to limit in the Mn specification of institute's steelmaking kind.
According to one embodiment of present invention, in semi deoxidized technique, do not need to carry out pre-deoxidation when making steel, specifically, when 600ppm≤endpoint molten steel oxygen activity < 1000ppm or 0.03wt%≤terminal [C]≤0.05wt%, directly carry out carburetting with carbon manganese alloy ball.According to one embodiment of present invention, add carbon manganese alloy carburelant when tapping 1/3, and add other alloys according to the fusing situation of boiling situation in ladle and above-mentioned carbon manganese alloy carburelant, all alloyings complete before operating in tapping 2/3.
According to another embodiment of the present invention, in semi deoxidized technique, as endpoint molten steel oxygen activity < 600ppm or terminal C content > 0.05wt%, add part deoxidation material, directly add carbon manganese alloy ball when tapping 1/4 as carburelant, add whole alloy depending on boiling situation in ladle.According to the present invention, deoxidation material can comprise at least one in ferro-aluminum, ferromanganese and ferrosilicon Si-Ca-Ba etc., and the amount adding 1-5kg by steel per ton adds deoxidation material and carries out pre-deoxidation in ladle.
In addition, according to the present invention, the omnidistance on-line argon-blow of tapping process, adopts slag-stopping tapping technique, controls the thickness≤70mm of ladle slag.
Below in conjunction with specific embodiments the present invention is described.
Adopt 1# to the 5# carbon manganese alloy ball shown in table 1 as carburelant respectively.According to above-described method respectively for B (PSL1), JS25Mn, 37Mn2,45, U71Mn, PG4 steel grade performs the recarburization process of converter steelmaking, wherein, carbon manganese alloy carburelant is tried out material and is made to use tricks about 200 tons.
Thermometric sampling before tapping, analyzes the residual Mn content in C, P, S content of molten steel terminal and molten steel.In molten steel, P, S are qualified, under temperature reaches the condition of institute's steelmaking kind specified requirement, according to carbon recovery rate be 89%, manganese yield is 92%, according to molten steel terminal C, Mn content and institute steelmaking kind C, Mn specification requirement, the add-on of carbon manganese alloy carburelant and the add-on of manganese alloy is calculated respectively by limit in institute's steelmaking kind specification, wherein, above-mentioned manganese alloy is silicomanganese or high carbon ferromanganese.The omnidistance on-line argon-blow of above-mentioned tapping process, adopts slag-stopping tapping technique, control ladle slag thick≤70mm.In addition, when endpoint molten steel oxygen activity is more than 1000ppm, before adding carbon manganese alloy carburelant, adds hard coal carry out deoxidation.
The composition of table 1 carbon manganese alloy ball carburelant and performance
Test-results shows, carbon, manganese element recovery rate are stable, carbon recovery rate average out to 89.17%, manganese yield average 92.08%, LFization slag time decreased 4.99min, and tapping process phosphorization is suitable with existing technique; The alloying technology adopting carbon manganese ball to carry out carburetting and manganese without impact, can meet strand P, S and Control and Inclusion Removal requirement on slab quality completely.
Therefore, the present invention changes the technique of traditional first deoxidation alloying carburetting again, and solve carbon recovery rate that in existing technique, hard coal recarburization process exists and to fluctuate large problem, carbon, manganese element recovery rate are stable.Meanwhile, use carbon manganese carburelant to replace hard coal carburelant and high carbon ferromanganese, ton steel new returns 0.57 yuan, reduce production cost.The heat of carbon manganese ball carburetting test, the change slag time of entering LF refining procedure obviously shortens, carbon, manganese element recovery rate are stable, ensure that steel grade steel quality, alleviate the pressure of LF process rhythm anxiety when casting machine is produced, to expansion square billet production capacity, guarantee stove machine rhythm, stablize Metal in Tundish superheating temperature, saving energy and reduce the cost serves pushing effect.
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 and combination to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Claims (7)
1. a recarburization process for converter mini-mill steelmaking, is characterized in that, described recarburization process comprises: in tapping process, adopts semi deoxidized technique, uses carbon manganese alloy ball as carburelant, thus carry out alloying to molten steel while to molten steel recarburization,
Wherein, in described semi deoxidized technique, as 600ppm≤endpoint molten steel oxygen activity < 1000ppm or 0.03wt%≤molten steel terminal C content≤0.05wt%, in molten steel, do not add deoxidation material carry out pre-deoxidation, add described carburelant when tapping 1/3, before tapping 2/3, complete alloying; As endpoint molten steel oxygen activity < 600ppm or molten steel terminal C content > 0.05wt%, add part deoxidation material, add described carburelant when tapping 1/4.
2. recarburization process according to claim 1, it is characterized in that, described carbon manganese alloy ball is made up of following material by weight: the Mn of C, 35-45 weight part of 32-43 weight part, be no more than 0.15 weight part P, be no more than 0.2 weight part S, be no more than the N of 0.2 weight part, be no more than the H of 1.5 weight parts
2o.
3. recarburization process according to claim 2, is characterized in that, the N in described carbon manganese alloy ball is no more than 0.1 weight part, H
2o is no more than 0.5 weight part.
4. recarburization process according to claim 1, is characterized in that, the particle diameter of described carbon manganese alloy ball is 5mm-15mm, and it is not broken that described carbon manganese alloy ball freely falls to rigid surface from 2 meters of eminences.
5. recarburization process according to claim 1, is characterized in that, the omnidistance on-line argon-blow of tapping process, adopt slag-stopping tapping technique, the thickness controlling ladle slag is no more than 70mm.
6. recarburization process according to claim 1, is characterized in that, described carbon manganese alloy ball is made up of carbon materials and manganese alloy material, and wherein, manganese alloy material is at least one in the group during silicomanganese and high carbon ferromanganese form.
7. recarburization process according to claim 1, is characterized in that, in alloying process, when determining that the Fe content in molten steel does not reach the Fe content of expectation, also in molten steel, adds manganese alloy,
Wherein, described manganese alloy is selected from least one in silicomanganese and high carbon ferromanganese.
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| CN102051440A (en) * | 2009-11-10 | 2011-05-11 | 攀钢集团钢铁钒钛股份有限公司 | Molten steel deoxidizing and carbureting method and steelmaking method |
| CN103160636A (en) * | 2011-12-19 | 2013-06-19 | 攀钢集团西昌钢钒有限公司 | Method for converter steel tapping alloying molten steel component evening |
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| CN102051440A (en) * | 2009-11-10 | 2011-05-11 | 攀钢集团钢铁钒钛股份有限公司 | Molten steel deoxidizing and carbureting method and steelmaking method |
| CN103160636A (en) * | 2011-12-19 | 2013-06-19 | 攀钢集团西昌钢钒有限公司 | Method for converter steel tapping alloying molten steel component evening |
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| "转炉用碳锰合金增碳材料的开发及应用";陈均;《炼钢》;20121005;第28卷(第5期);第16-19页 * |
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