CN103627851A - Semisteel steelmaking temperature control method and semisteel steelmaking method - Google Patents
Semisteel steelmaking temperature control method and semisteel steelmaking method Download PDFInfo
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Abstract
The invention provides a semisteel steelmaking temperature control method and a semisteel steelmaking method. The method comprises the following steps: in the process of discharging semisteel into a ladle, adding 1.5-6.0kg/(t semisteel) silicon iron into the ladle, wherein the semisteel is molten steel prepared by carrying out vanadium extraction converter or dephosphorization converter blowing on vanadium-containing molten iron, and contains 3.20-3.80 wt% of C and 0.001-0.05 wt% of Si, and the temperature of the semisteel is 1320-1390 DEG C; and adding the semisteel into the steelmaking furnace, lowering an oxygen lance to perform oxygen blowing smelting while adding related slagging materials and alloys according to the blowing smelting requirements. The method can shorten the early slag formation time, enhance the steelmaking slagging speed, enhance the molten steel temperature, effectively control the steel material consumption in the steelmaking process, and avoid the problem of low utilization ratio of carbon carburizing materials.
Description
Technical field
The invention belongs to semi-steel making technical field, specifically, the Semi-steel making method that relates to a kind of semi-steel making temperature-controlled process and adopt this semi-steel making temperature-controlled process.
Background technology
Generally, for example, by (containing vanadium iron ore deposit, vanadium titano-magnetite) vanadium-bearing hot metal obtaining after blast-furnace smelting is after converter extracting vanadium or dephosphorization converter smelting, obtain half steel, the feature of this half steel is carbon low (on average in 3.6% left and right), silicon low (below 0.01%), manganese low (below 0.05%), heat source insufficiency, slagging constituent content are low, and temperature is high compared with molten iron, and slag oxidisability in early stage is lower and initial stage slagging is more difficult.When adopting this half steel to smelt, because heating element in half steel is fewer than molten iron, for carrying out smoothly of guaranteeing to smelt, also need to add temperature raising agent to supplement heat content.In addition, the raising of molten iron temperature, can also increase adding of steel scrap amount, reduces steel making working procedure iron and steel stock consumption, thereby reduces converter energy consumption.
Prior art mainly concentrates on four aspects substantially, the one, half steel come out of the stove or half steel production process in add carburelant, to improve carbon content of molten steel, thereby reduce the problem of half steel heat source insufficiency, but the carbon recovery rate of this method is lower; The 2nd, by add carburelant in converting process, by carburelant, be oxidized to improve liquid steel temperature, same, the recovery rate of present method carbon is also low; The 3rd, by molten steel is blown to temperature raising deeply, then require with addition of carburelant according to steel grade, this method can cause that molten steel terminal oxygen activity is high, deoxygenated alloy consumption large, iron and steel stock consumption increases; The 4th, blowing molten steel, to requiring composition, heats to improve liquid steel temperature by LF stove, and this method power consumption is high, process flow lengthens.
Application number is that the patent documentation of CN93107206.9 discloses a kind of method for making steel, and the method is used solid iron metalloid material as the reinforced major portion of metal and utilized two kinds of dissimilar carbonaceous materials and heat that steel scrap burning is emitted.The volatilizable hydrocarbons content of one of carbonaceous material is high, its effect is to make the material preheating of iron class partial melting, hydrocarbons content that another carbonaceous material is volatilizable is low and provide reducing power for melt carburetting, and provide additional heat by burning, for strengthening the heating and melting of solid iron class material.Present method also comprises and is blown into oxygen-rich oxide gas, for the burning of carbonaceous material hydrocarbon polymer with fusing the formed melting materials capable of refining.Application number is that the patent documentation of CN201110427130.X discloses a kind of method for making steel and application and a kind of continuous cast method, and (1) is used converter to carry out just refining, then the molten steel that just refining obtains is tapped in ladle; (2) in tapping process, before carrying out alloying, molten steel is carried out carburetting and carries out selectivity deoxidation, making to take the gross weight of molten steel is benchmark, the activity oxygen level of molten steel is≤100ppm.Application number is that the patent documentation of CN200910211433.0 discloses a kind of deoxidation of molten steel carburetion method and method for making steel, this method for making steel comprises that the molten steel that smelting is obtained taps in ladle, and in tapping process, molten steel is carried out to deoxidation carburetting, and then the molten steel obtaining after deoxidation carburetting is carried out to external refining, wherein, the described method that molten steel is carried out to deoxidation carburetting is deoxidation of molten steel carburetion method of the present invention.In described deoxidation carburetion method, first add carburelant, when adjusting carbon content, make carburelant react the spontaneous stirring gas of generation with the oxygen in molten steel.The reductor adding subsequently under the stirring action of spontaneous stirring gas can with molten steel fully, mix equably, thereby obtain temperature, composition evenly and meet the molten steel of refining requirement, for next step operation has been created good condition.Application number is that the patent documentation of CN02122532.X discloses a kind of method for making steel with molten iron as carburant, the method is the online hot metal charging device utilizing with metering and baking, lagging facility, the molten iron of precalculated consumption is blended into ladle, then the method for the ladle carburetting of tapping.Application number is the method for making steel that the patent documentation of CN201010215297.5 discloses a kind of carbon manganese alloy material and its preparation method and application this material, the method adopts its carbon manganese alloy material stably to molten steel, to carry out carburetting or to increase manganese, solved the problem that steel grades is unstable, qualification rate is low of smelting, the rate of recovery of carbon and manganese is high and stable, and the rate of recovery of carbon and manganese all can stably be controlled between 90-96 % by weight.
From above-mentioned prior art, the present invention yet there are no report, still belongs to precedent.
Summary of the invention
The object of the invention is to solve at least one in the deficiency that above-mentioned prior art exists.
For example, one of object of the present invention is to solve the poor problem of steelworks semi-steel making physical temperature, and a kind of semi-steel making temperature-controlled process is provided.
An aspect of of the present present invention provides a kind of semi-steel making temperature-controlled process.Said method comprising the steps of: in ladle, going out in the process of half steel, the ferrosilicon of 1.5～6.0kg/ (t half steel) is joined in ladle; Then half steel is blended in steel melting furnace, lower oxygen gun blowing is smelted and is added relevant slag making materials and alloy by blowing requirement.Wherein, described half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium or dephosphorization converter finishing blowing, and wherein contains 3.20%～3.80% C, 0.001%～0.05% Si by weight percentage, and the temperature of described half steel is 1320 ℃～1390 ℃.
Another aspect of the present invention provides a kind of semi-steel making temperature-controlled process.Said method comprising the steps of: half steel is blended into after steel-making converter, the ferrosilicon of 1～5kg/ (t half steel) is joined in steel-making converter; Then descend oxygen gun blowing to smelt and add relevant slag making materials and alloy by blowing requirement.
Another aspect of the present invention provides a kind of semi-steel making temperature-controlled process.Said method comprising the steps of: half steel is blended into after steel-making converter, and lower oxygen gun blowing is smelted after 0.5～1min, the ferrosilicon of 1～5kg/ (t half steel) is joined in steel-making converter, by blowing requirement, add relevant slag making materials and alloy simultaneously.
Another aspect of the present invention provides a kind of Semi-steel making method.Described Semi-steel making method comprises that employing semi-steel making temperature-controlled process as above improves liquid steel temperature.
Compared with prior art, beneficial effect of the present invention comprises: can shorten initial stage slag formation time, improve steelmaking slagging speed; Can improve liquid steel temperature; Can effectively control the consumption of steelmaking process iron and steel stock; Can avoid the low problem of carbonaceous carburetting material use efficiency.
Embodiment
Hereinafter, in connection with exemplary embodiment, describe semi-steel making temperature-controlled process of the present invention and Semi-steel making method in detail.
In one exemplary embodiment of the present invention, semi-steel making temperature-controlled process can comprise the following steps: in ladle, going out in the process of half steel, the ferrosilicon of 1.5～6.0kg/ (t half steel) is joined in ladle, wherein, described half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium or dephosphorization converter finishing blowing, and wherein contain 3.20%～3.80% C, 0.001%～0.05% Si by weight percentage, the temperature of described half steel is 1320 ℃～1390 ℃; Then half steel is blended in steel melting furnace, lower oxygen gun blowing is smelted and is added relevant slag making materials and alloy by blowing requirement.Preferably, in the method for this exemplary embodiment, the add-on of ferrosilicon can be the ferrosilicon of 2.2～4.5kg/ (t half steel).
In another exemplary embodiment of the present invention, semi-steel making temperature-controlled process can comprise the following steps: half steel is blended into after steel-making converter, the ferrosilicon of 1～5kg/ (t half steel) is joined in steel-making converter; Then descend oxygen gun blowing to smelt and add relevant slag making materials and alloy by blowing requirement.
In another exemplary embodiment of the present invention, semi-steel making temperature-controlled process can comprise the following steps: half steel is blended into after steel-making converter, lower oxygen gun blowing is smelted after 0.5～1min, the ferrosilicon of 1～5kg/ (t half steel) is joined in steel-making converter, by blowing requirement, add relevant slag making materials and alloy simultaneously.
In superincumbent exemplary embodiment, the temperature of half steel can be 1320 ℃～1380 ℃, and the add-on of ferrosilicon can determine according to half steel temperature, and half steel temperature more low-silicon iron add-on is also just fewer.
In semi-steel making temperature-controlled process of the present invention, relevant slag making materials can be lime, high magnesium lime, composite fluxing medium, wherein, contains SiO in composite fluxing medium
216%～20%, the CaO of Mn10%～15% and surplus.The add-on of relevant slag making materials can add according to steel-making requirements.Described alloy is steel-making alloys in common use, and its add-on can add according to smelting requirements.In semi-steel making temperature-controlled process of the present invention, ferrosilicon can contain more than 75% Si by weight percentage.
In another exemplary embodiment of the present invention, Semi-steel making method comprises that employing semi-steel making temperature-controlled process as above improves liquid steel temperature.
Description exemplary embodiment of the present invention below in conjunction with concrete illustrating property of example.
Example 1
In this example, half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium finishing blowing, and wherein contains 3.52% C, 0.01% Si by weight percentage.
In ladle, going out in the process of half steel, the ferrosilicon of 1.5kg/ (t half steel) is being joined in ladle; Then half steel is blended in steel melting furnace, lime, 15kg/ (t half steel) high magnesium lime, 1kg/ (t half steel) composite fluxing medium of 35kg/ (t half steel) smelted and added to lower oxygen gun blowing, initial stage slag formation time 2.2min, until liquid steel temperature, reach after 1650 ℃, propose oxygen rifle, stop blowing.The carbon content that obtains molten steel is 0.11%, and the consumption of ton steel iron and steel stock is 1050kg.
Example 2
In this example, half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium finishing blowing, and wherein contains 3.47% C, 0.01% Si by weight percentage.
In ladle, going out in the process of half steel, the ferrosilicon of 6kg/ (t half steel) is being joined in ladle; Then half steel is blended in steel melting furnace, lime, 10kg/ (t half steel) high magnesium lime of 36kg/ (t half steel) smelted and added to lower oxygen gun blowing, and initial stage slag formation time 2.6min, reaches after 1680 ℃ until liquid steel temperature, proposes oxygen rifle, stops blowing.The carbon content that obtains molten steel is 0.19%, and the consumption of ton steel iron and steel stock is 1051kg.
Example 3
In this example, half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium finishing blowing, and wherein contains 3.55% C, 0.02% Si by weight percentage.
Half steel is blended into after steel-making converter, the ferrosilicon of 1.5kg/ (t half steel) is joined in steel-making converter; Then descend oxygen gun blowing to smelt and add the lime of 32kg/ (t half steel), 13kg/ (t half steel) high magnesium lime, initial stage slag formation time 3.1min, reaches after 1670 ℃ until liquid steel temperature, proposes oxygen rifle, stops blowing.The carbon content that obtains molten steel is 0.16%, and the consumption of ton steel iron and steel stock is 1049kg.
Example 4
In this example, half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium finishing blowing, and wherein contains 3.72% C, 0.03% Si by weight percentage.
Half steel is blended into after steel-making converter, the ferrosilicon of 6kg/ (t half steel) is joined in steel-making converter; Then descend oxygen gun blowing to smelt and add the lime of 41kg/ (t half steel), 16kg/ (t half steel) high magnesium lime, initial stage slag formation time 3.5min, reaches after 1675 ℃ until liquid steel temperature, proposes oxygen rifle, stops blowing.The carbon content that obtains molten steel is 0.20%, and the consumption of ton steel iron and steel stock is 1053kg.
Example 5
In this example, half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium finishing blowing, and wherein contains 3.55% C, 0.02% Si by weight percentage.
Half steel is blended into after steel-making converter, and lower oxygen gun blowing is smelted after 1min, and the ferrosilicon of 1.5kg/ (t half steel) is joined in steel-making converter; The lime, 12kg/ (t half steel) high magnesium lime that add 38kg/ (t half steel), initial stage slag formation time 2.5min, re-blows after catch carbon to liquid steel temperature and reaches after 1665 ℃, proposes oxygen rifle, stops blowing simultaneously.The carbon content that obtains molten steel is 0.11%, and the consumption of ton steel iron and steel stock is 1048kg.
Example 6
In this example, half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium finishing blowing, and wherein contains 3.45% C, 0.01% Si by weight percentage.
Half steel is blended into after steel-making converter, and lower oxygen gun blowing is smelted after 1min, and the ferrosilicon of 6kg/ (t half steel) is joined in steel-making converter; The lime, 13kg/ (t half steel) high magnesium lime that add 37kg/ (t half steel), initial stage slag formation time 3min, re-blows after catch carbon to liquid steel temperature and reaches after 1650 ℃, proposes oxygen rifle, stops blowing simultaneously.The carbon content that obtains molten steel is 0.018%, and the consumption of ton steel iron and steel stock is 1049kg.
The present invention can effectively solve the poor problem of steelworks semi-steel making physical temperature; Can increase the heat-transmission of steelmaking process elemental oxygen, liquid steel temperature is controlled in claimed range, reduce the oxidation of carbon and iron in steel simultaneously, reduce iron and steel stock consumption, improve semi-steel making because of the problem of the few slag making difficulty of slagging element; Can, better promoting the quick formation of steelmaking slag to be conducive to converter control liquid steel temperature and endpoint carbon content, be conducive to improve semi-steel making level of control.
Although described the present invention in conjunction with exemplary embodiment above, those of ordinary skills should be clear, in the situation that do not depart from the spirit and scope of claim, can carry out various modifications to above-described embodiment.
Claims (6)
1. a semi-steel making temperature-controlled process, is characterized in that, said method comprising the steps of:
In ladle, going out in the process of half steel, the ferrosilicon of 1.5～6.0kg/ (t half steel) is joined in ladle, wherein, described half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium or dephosphorization converter finishing blowing, and wherein contain 3.20%～3.80% C, 0.001%～0.05% Si by weight percentage, the temperature of described half steel is 1320 ℃～1390 ℃;
Then half steel is blended in steel melting furnace, lower oxygen gun blowing is smelted and is added relevant slag making materials and alloy by blowing requirement.
2. a semi-steel making temperature-controlled process, is characterized in that, said method comprising the steps of:
Half steel is blended into after steel-making converter, the ferrosilicon of 1～5kg/ (t half steel) is joined in steel-making converter, wherein, described half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium or dephosphorization converter finishing blowing, and wherein contain 3.20%～3.80% C, 0.001%～0.05% Si by weight percentage, the temperature of described half steel is 1320 ℃～1390 ℃;
Then descend oxygen gun blowing to smelt and add relevant slag making materials and alloy by blowing requirement.
3. a semi-steel making temperature-controlled process, is characterized in that, said method comprising the steps of:
Half steel is blended into after steel-making converter, lower oxygen gun blowing is smelted after 0.5～1min, the ferrosilicon of 1～5kg/ (t half steel) is joined in steel-making converter, by blowing requirement, add relevant slag making materials and alloy simultaneously, wherein, described half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium or dephosphorization converter finishing blowing, and wherein contains 3.20%～3.80% C, 0.001%～0.05% Si by weight percentage, and the temperature of described half steel is 1320 ℃～1390 ℃.
4. according to the semi-steel making temperature-controlled process described in any one in claims 1 to 3, it is characterized in that, described relevant slag making materials and alloy are lime, high magnesium lime, composite fluxing medium and steel-making alloy.
5. according to the semi-steel making temperature-controlled process described in any one in claims 1 to 3, it is characterized in that, the add-on of described ferrosilicon is the ferrosilicon of 2.5～4.5kg/ (t half steel).
6. a Semi-steel making method, is characterized in that, described Semi-steel making method comprises that employing improves liquid steel temperature according to the semi-steel making temperature-controlled process described in any one in claims 1 to 3.
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| CN104004882A (en) * | 2014-06-04 | 2014-08-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Method of semisteel silicon increasing processing and method of semisteel converter steelmaking |
| CN104017936A (en) * | 2014-06-10 | 2014-09-03 | 张家港市锦丰润尔发五金塑料厂 | Oxide steel-making method |
| CN107058679A (en) * | 2017-04-18 | 2017-08-18 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method for stablizing half steel quality |
| CN109097524A (en) * | 2018-09-30 | 2018-12-28 | 四川德胜集团钒钛有限公司 | A kind of method that vanadium extraction semisteel smelting reduces molten steel consumption |
| CN112646943A (en) * | 2020-12-17 | 2021-04-13 | 攀钢集团西昌钢钒有限公司 | Method for controlling dry dedusting explosion venting in semisteel smelting |
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| CN102766722A (en) * | 2012-07-17 | 2012-11-07 | 攀钢集团研究院有限公司 | Method for smelting high-carbon steel from semi-steel |
| 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 |
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| CN102766722A (en) * | 2012-07-17 | 2012-11-07 | 攀钢集团研究院有限公司 | Method for smelting high-carbon steel from semi-steel |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104004882A (en) * | 2014-06-04 | 2014-08-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Method of semisteel silicon increasing processing and method of semisteel converter steelmaking |
| CN104004882B (en) * | 2014-06-04 | 2016-03-23 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of half steel increases the method for silicon process and the method for semisteel converter steelmaking |
| CN104017936A (en) * | 2014-06-10 | 2014-09-03 | 张家港市锦丰润尔发五金塑料厂 | Oxide steel-making method |
| CN107058679A (en) * | 2017-04-18 | 2017-08-18 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method for stablizing half steel quality |
| CN107058679B (en) * | 2017-04-18 | 2019-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | A method of stablizing half steel quality |
| CN109097524A (en) * | 2018-09-30 | 2018-12-28 | 四川德胜集团钒钛有限公司 | A kind of method that vanadium extraction semisteel smelting reduces molten steel consumption |
| CN112646943A (en) * | 2020-12-17 | 2021-04-13 | 攀钢集团西昌钢钒有限公司 | Method for controlling dry dedusting explosion venting in semisteel smelting |
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