CN103627840A - Method for enhancing end point carbon content of converter and semisteel steelmaking method - Google Patents
Method for enhancing end point carbon content of converter and semisteel steelmaking method Download PDFInfo
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Abstract
The invention provides a method for enhancing end point carbon content in a converter and a semisteel steelmaking method. The method comprises the following steps: in the process of discharging semisteel into a ladle, adding 6.0-20.0kg/(t semisteel) manganese iron into the ladle; adding the semisteel into a steelmaking furnace, and lowering an oxygen lance to perform oxygen blowing smelting while adding related slagging materials and alloys according to the blowing smelting requirements; and after catching carbon, supplementing oxygen blowing according to the carbon content to control the end point carbon content of the molten steel at 0.20-0.35%, and lifting the oxygen lance to stop blowing smelting, wherein the semisteel is molten steel prepared by carrying out vanadium extraction converter or dephosphorization converter blowing on vanadium-containing molten iron, and contains 3.2-3.8 wt% of C and 0.001-0.05 wt% of Si, and the temperature of the semisteel is 1320-1390 DEG C. 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, relate to a kind of Semi-steel making method that improves the method for endpoint carbon content of converter and adopt the method for this raising endpoint carbon content of converter.
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 problem that steelworks semi-steel making physical temperature is poor, endpoint carbon content is low, and a kind of method that improves endpoint carbon content of converter is provided.
An aspect of of the present present invention provides a kind of method that improves endpoint carbon content of converter.Said method comprising the steps of: in ladle, going out in the process of half steel, the ferromanganese of 6.0～20.0kg/ (t half steel) is joined in ladle, described half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium or dephosphorization converter finishing blowing, and wherein contain 3.2%～3.8% 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, after catch carbon, according to carbon content, re-blows, and molten steel endpoint carbon content is controlled to 0.20%～0.35%, carries oxygen and goes out rifle, stops blowing.
Another aspect of the present invention provides a kind of method that improves endpoint carbon content of converter.Said method comprising the steps of: half steel is blended into after steel-making converter, the ferromanganese of 6.0～20.0kg/ (t half steel) is joined in steel-making converter, described half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium or dephosphorization converter finishing blowing, and wherein contain 3.2%～3.8% 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, after catch carbon, according to carbon content, re-blowing, molten steel endpoint carbon content is controlled to 0.20%～0.35%, carrying oxygen and go out rifle, stopping blowing.
Another aspect of the present invention provides a kind of method that improves endpoint carbon content of converter.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 ferromanganese of 3～10kg/ (t half steel) is joined in steel-making converter, by blowing requirement, add relevant slag making materials and alloy simultaneously; After catch carbon, according to carbon content, re-blow, and add the ferromanganese of 3～10kg/ (t half steel), molten steel endpoint carbon content is controlled to 0.20%～0.35%, carry oxygen and go out rifle, stop blowing, 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 3.2%～3.8% C, 0.001～0.05% Si by weight percentage, the temperature of described half steel is 1320～1390 ℃.
Another aspect of the present invention provides a kind of Semi-steel making method.Described Semi-steel making method comprises the carbon content that adopts the method for raising endpoint carbon content of converter as above to improve endpoint molten steel.
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 method and the Semi-steel making method of raising endpoint carbon content of converter of the present invention in detail.
In one exemplary embodiment of the present invention, the method that improves endpoint carbon content of converter can comprise the following steps: in ladle, going out in the process of half steel, the ferromanganese of 6.0～20.0kg/ (t half steel) is joined in ladle, described half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium or dephosphorization converter finishing blowing, and wherein contain 3.2%～3.8% C by weight percentage, 0.001～0.05% Si, the temperature of described half steel is 1320～1390 ℃, preferably, according to half steel temperature, determine the add-on of ferromanganese, half steel temperature is lower, the add-on of ferromanganese is larger, half steel temperature is higher, the add-on of ferromanganese is fewer, for example, when half steel temperature is 1325 ℃ of left and right, the ferromanganese that adds 20.0kg/ (t half steel), when half steel temperature is 1385 ℃ of left and right, add the ferromanganese of 6.0kg/ (t half steel), 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, after catch carbon, according to carbon content, re-blows, and molten steel endpoint carbon content is controlled to 0.20%～0.35%, proposes oxygen rifle, stops blowing.Preferably, in the method for this exemplary embodiment, the add-on of ferromanganese can be the ferromanganese of 8.0～15.0kg/ (t half steel).
In another exemplary embodiment of the present invention, the method that improves endpoint carbon content of converter can comprise the following steps: half steel is blended into after steel-making converter, the ferromanganese of 6.0～20.0kg/ (t half steel) is joined in steel-making converter, described half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium or dephosphorization converter finishing blowing, and wherein contain 3.2%～3.8% 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, after catch carbon, according to carbon content, re-blowing, molten steel endpoint carbon content is controlled to 0.20%～0.35%, proposing oxygen rifle, stopping blowing.Preferably, in the method for this exemplary embodiment, the add-on of ferromanganese can be the ferromanganese of 8.0～15.0kg/ (t half steel).
In another exemplary embodiment of the present invention, the method that improves endpoint carbon content of converter 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 ferromanganese of 3～10kg/ (t half steel) is joined in steel-making converter, by blowing requirement, add relevant slag making materials and alloy simultaneously, after catch carbon, according to carbon content, re-blow, and the ferromanganese that adds 3～10kg/ (t half steel) according to molten steel carbon and temperature conditions (for example, when carbon content of molten steel <0.30% or temperature <1600 ℃, add the ferromanganese of 10kg/ (t half steel), when the carbon content >0.6% of molten steel or temperature >1650 ℃, add the ferromanganese of 3kg/ (t half steel), when the carbon content of molten steel be greater than 0.3% and while being less than 0.6% or temperature be greater than 1600 ℃ and while being less than 1640 ℃, carbon content is lower or temperature is lower, now ferromanganese add the higher value measuring in 3～10kg/ (t half steel) scope, when carbon content of molten steel is higher or temperature is higher, now ferromanganese add the smaller value measuring in 3～10kg/ (t half steel) scope), molten steel endpoint carbon content is controlled to 0.20%～0.35%, carry oxygen and go out rifle, stop blowing, 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 3.2%～3.8% C by weight percentage, 0.001～0.05% Si, the temperature of described half steel is 1320～1390 ℃.Preferably, in the method for this exemplary embodiment, the add-on of the ferromanganese of lower oxygen gun blowing blowing step and the step of re-blowing is the ferromanganese of 5～8kg/ (t half steel).
In the method for raising semi-steel making endpoint carbon content of the present invention, relevant slag making materials and alloy can be lime, high magnesium lime, composite fluxing medium and steel-making alloy, wherein, contain SiO in composite fluxing medium
216%～20%, the CaO of Mn10%～15% and surplus.The add-on of relevant slag making materials and alloy can add according to steel-making requirements.In the method for raising endpoint carbon content of converter of the present invention, ferromanganese can contain more than 75% Mn by weight percentage.
In another exemplary embodiment of the present invention, Semi-steel making method comprises the carbon content that adopts the method for raising endpoint carbon content of converter as above to improve endpoint molten steel.
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, and half steel temperature is 1385 ℃.
In ladle, going out in the process of half steel, the ferromanganese of 6kg/ (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 0.21%, 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, and half steel temperature is 1325 ℃.
In ladle, going out in the process of half steel, the ferromanganese of 20kg/ (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 0.34%, 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, and half steel temperature is 1385 ℃.
Half steel is blended into after steel-making converter, the ferromanganese of 20kg/ (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 0.29%, 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, and half steel temperature is 1325 ℃.
Half steel is blended into after steel-making converter, the ferromanganese 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 0.22%, 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, and half steel temperature is 1370 ℃.
Half steel is blended into after steel-making converter, and lower oxygen gun blowing is smelted after 1min, and the ferromanganese of 3kg/ (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, adds 10kg ferromanganese to re-blow to liquid steel temperature and reaches after 1665 ℃ after catch carbon, propose oxygen rifle, stops blowing simultaneously.The carbon content that obtains molten steel is 0.31%, 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, and half steel temperature is 1345 ℃.
Half steel is blended into after steel-making converter, and lower oxygen gun blowing is smelted after 1min, and the ferromanganese of 10kg/ (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, adds 10kg ferromanganese to re-blow to liquid steel temperature and reaches after 1650 ℃ after catch carbon, propose oxygen rifle, stops blowing simultaneously.The carbon content that obtains molten steel is 0.28%, and the consumption of ton steel iron and steel stock is 1049kg.
The present invention can effectively solve the problem that steelworks semi-steel making physical temperature is poor, endpoint carbon content is low; 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 (7)
1. a method that improves endpoint carbon content of converter, is characterized in that, said method comprising the steps of:
In ladle, going out in the process of half steel, the ferromanganese of 6.0～20.0kg/ (t half steel) is joined in ladle, described half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium or dephosphorization converter finishing blowing, and wherein contain 3.2%～3.8% 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, after catch carbon, according to carbon content, re-blows, and molten steel endpoint carbon content is controlled to 0.20%～0.35%, carries oxygen and goes out rifle, stops blowing.
2. a method that improves endpoint carbon content of converter, is characterized in that, said method comprising the steps of:
Half steel is blended into after steel-making converter, the ferromanganese of 6.0～20.0kg/ (t half steel) is joined in steel-making converter, described half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium or dephosphorization converter finishing blowing, and wherein contain 3.2%～3.8% 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, after catch carbon, according to carbon content, re-blowing, molten steel endpoint carbon content is controlled to 0.20%～0.35%, carrying oxygen and go out rifle, stopping blowing.
3. the method for raising endpoint carbon content of converter according to claim 1 and 2, is characterized in that, the add-on of described ferromanganese is the ferromanganese of 8.0～15.0kg/ (t half steel).
4. a method that improves endpoint carbon content of converter, is characterized in that, 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, and the ferromanganese of 3～10kg/ (t half steel) is joined in steel-making converter, adds relevant slag making materials and alloy by blowing requirement simultaneously;
After catch carbon, according to carbon content, re-blow, and add the ferromanganese of 3～10kg/ (t half steel), molten steel endpoint carbon content is controlled to 0.20%～0.35%, carry oxygen and go out rifle, stop blowing, 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 3.2%～3.8% C, 0.001～0.05% Si by weight percentage, and the temperature of described half steel is 1320～1390 ℃.
5. according to the method for the raising endpoint carbon content of converter described in any one in claim 1,2 or 4, it is characterized in that, described relevant slag making materials and alloy are lime, high magnesium lime, composite fluxing medium and steel-making alloy.
6. the method for the raising endpoint carbon content of converter described in any one according to claim 4, is characterized in that, described lower oxygen gun blowing blowing step and described in the re-blow add-on of ferromanganese of step be the ferromanganese of 5～8kg/ (t half steel).
7. a Semi-steel making method, is characterized in that, described Semi-steel making method comprises that employing improves the carbon content of endpoint molten steel according to the method for the raising endpoint carbon content of converter described in any one in claim 1,2 or 4.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114657311A (en) * | 2022-04-20 | 2022-06-24 | 新疆八一钢铁股份有限公司 | Operation method for directly smelting variety steel by duplex semisteel |
| CN115786626A (en) * | 2022-12-23 | 2023-03-14 | 阳春新钢铁有限责任公司 | Method for reducing oxygen of industrial material molten steel entering station |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114657311A (en) * | 2022-04-20 | 2022-06-24 | 新疆八一钢铁股份有限公司 | Operation method for directly smelting variety steel by duplex semisteel |
| CN115786626A (en) * | 2022-12-23 | 2023-03-14 | 阳春新钢铁有限责任公司 | Method for reducing oxygen of industrial material molten steel entering station |
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