CN103627842B - Method for enhancing end point carbon content in smelting medium-carbon steel from semisteel and semisteel steelmaking method - Google Patents
Method for enhancing end point carbon content in smelting medium-carbon steel from semisteel and semisteel steelmaking method Download PDFInfo
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Abstract
The invention provides a method for enhancing end point carbon content in smelting medium-carbon steel from semisteel and a semisteel steelmaking method. The method comprises the following steps: in the process of discharging semisteel into a ladle, adding 3-8kg/(t semisteel) silicon iron into the ladle; adding semisteel into the 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 0.20-0.30%, 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 3.20-3.80 wt% of C and 0.001-0.05 wt% of Si, and the temperature of the semisteel is 1320-1390 DEG C. 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 of the method for endpoint carbon content when relating to a kind of method of endpoint carbon content when improving semisteel smelting medium carbon steel and adopt this raising semisteel smelting medium carbon steel.
Background technology
Generally, by containing vanadium iron ore deposit (such as, vanadium titano-magnetite) vanadium-bearing hot metal that obtains after blast-furnace smelting is after converter extracting vanadium or dephosphorization converter are smelted, obtain half steel, the feature of this half steel is carbon low (on average about 3.6%), silicon low (less than 0.01%), manganese low (less than 0.05%), heat source insufficiency, slagging constituent content are low, and temperature comparatively molten iron is high, and slag oxidisability in early stage is lower and initial stage slagging is more difficult.When adopting this half steel to smelt, because in half steel, heating element is fewer than molten iron, in order to ensure carrying out smoothly of smelting, also needing to add temperature raising agent and supplementing heat content.In addition, the raising of molten iron temperature, can also increase adding of steel scrap amount, reduces steel making working procedure steel technology amount, thus reduces converter energy consumption.
Prior art mainly concentrates on four aspects substantially, and one is come out of the stove at half steel or add carburelant in half steel production process, to improve carbon content of molten steel, thus reduce the problem of half steel heat source insufficiency, but the carbon recovery rate of this method is lower; Two is by adding carburelant in converting process, is oxidized improves liquid steel temperature by carburelant, same, and the recovery rate of present method carbon is also low; Three is by molten steel is blown temperature raising deeply, then requires with addition of carburelant according to steel grade, and this method can cause that molten steel terminal oxygen activity is high, deoxygenated alloy consumption is large, steel technology increases; Four be blowing molten steel to requiring composition, by LF stove heating improve liquid steel temperature, this method power consumption is high, process flow lengthen.
Application number be CN93107206.9 patent document discloses a kind of method for making steel, the method uses solid iron metalloid material as the major portion of metal charge and utilizes two kinds of dissimilar carbonaceous materials and steel scrap to burn the heat of releasing.The volatilizable hydrocarbons content of one of carbonaceous material is high, its effect makes the material preheating of iron class and 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 hydrocarbon polymer in carbonaceous material with fusing and the melting materials capable that formed of refining.Application number be CN201110427130.X patent document discloses a kind of method for making steel and application thereof and a kind of continuous cast method, (1) uses converter to carry out just refining, then taps in ladle by just refining the molten steel obtained; (2) in tapping process, carry out carburetting and carry out selectivity deoxidation, made with the gross weight of molten steel for benchmark before carrying out alloying to molten steel, the activity oxygen level of molten steel is≤100ppm.Application number be CN200910211433.0 patent document discloses a kind of deoxidation of molten steel carburetion method and method for making steel, this method for making steel comprises taps in ladle by smelting the molten steel obtained, and in tapping process, deoxidation carburetting is carried out to molten steel, and then external refining is carried out to the molten steel obtained after deoxidation carburetting, wherein, described method of carrying out deoxidation carburetting to molten steel is deoxidation of molten steel carburetion method of the present invention.In described deoxidation carburetion method, first add carburelant, while adjustment carbon content, the oxygen in carburelant and molten steel is reacted and produce spontaneous stirring gas.The reductor added subsequently fully, equably can mix with molten steel under the stirring action of spontaneous stirring gas, thus obtains temperature, uniform composition and meet the molten steel of refining requirement, for next step operation creates good condition.Application number is the method for making steel that patent document discloses a kind of molten iron as carburant of CN02122532.X, the method is that utilization band measures and toasts, the online hot metal charging device of lagging facility, the molten iron of precalculated consumption is blended into ladle, the method for the ladle carburetting of then tapping.Application number is the method for making steel that patent document discloses a kind of carbon manganese alloy material and its preparation method and application this material of CN201010215297.5, the method adopts its carbon manganese alloy material stably to carry out carburetting to molten steel or to increase manganese, solve and smelt the problem that steel grades is unstable, qualification rate is low, the rate of recovery of carbon and manganese is high and stable, and the rate of recovery of carbon and manganese all can stably control 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 at least one item solved in the deficiency of above-mentioned prior art existence.
Such as, endpoint carbon content low problem when an object of the present invention is to solve steelworks semisteel smelting medium carbon steel, and a kind of method providing endpoint carbon content when improving semisteel smelting medium carbon steel.
An aspect of of the present present invention provides a kind of method of endpoint carbon content when improving semisteel smelting medium carbon steel.Said method comprising the steps of: going out in the process of half steel in ladle, the ferrosilicon of 3 ~ 8kg/ (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 containing the C of 3.20% ~ 3.80%, the Si of 0.001% ~ 0.05% by weight percentage, the temperature of described half steel is 1320 ~ 1390 DEG C; Then be blended in steel melting furnace by half steel, lower oxygen gun blowing is smelted and is added relevant slag making materials and alloy by blowing requirement, re-blows, controls 0.20% ~ 0.30% by molten steel endpoint carbon content, carry oxygen and go out rifle, stop blowing after catch carbon according to carbon content.
Another aspect provides a kind of method of endpoint carbon content when improving semisteel smelting medium carbon steel.Said method comprising the steps of: after half steel is blended into steel-making converter, the ferrosilicon of 3 ~ 8kg/ (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 containing the C of 3.20% ~ 3.80%, the Si of 0.001% ~ 0.05% by weight percentage, the temperature of described half steel is 1320 ~ 1390 DEG C; Then descend oxygen gun blowing to smelt and add relevant slag making materials and alloy by blowing requirement, re-blowing according to carbon content after catch carbon, molten steel endpoint carbon content is controlled 0.20% ~ 0.30%, carry oxygen and go out rifle, stop blowing.
Another aspect provides a kind of method of endpoint carbon content when improving semisteel smelting medium carbon steel.Said method comprising the steps of: after half steel is blended into steel-making converter, the ferrosilicon of 1 ~ 4kg/ (t half steel) joins in steel-making converter after smelting 0.5 ~ 1min by lower oxygen gun blowing, adds relevant slag making materials and alloy by blowing requirement simultaneously; The ferrosilicon of 2 ~ 4kg/ (t half steel) is added after catch carbon, re-blow, molten steel endpoint carbon content is controlled 0.20% ~ 0.30%, 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 containing the C of 3.20% ~ 3.80%, the Si of 0.001% ~ 0.05% by weight percentage, the temperature of described half steel is 1320 ~ 1390 DEG C.
Another aspect provides a kind of Semi-steel making method.Described Semi-steel making method comprises the method for endpoint carbon content when adopting raising semisteel smelting medium carbon steel as above to improve the carbon content of endpoint molten steel.
Compared with prior art, beneficial effect of the present invention comprises: can shorten initial stage slag formation time, improves steelmaking slagging speed; Liquid steel temperature when tapping can be ensured, and improve endpoint carbon content; Effectively can control the consumption of steelmaking process iron and steel stock; The problem that carbonaceous carburetting material use efficiency is low can be avoided.
Embodiment
Hereinafter, by the method for endpoint carbon content when describing raising semisteel smelting medium carbon steel of the present invention in detail in conjunction with exemplary embodiment and Semi-steel making method.
In one exemplary embodiment of the present invention, the method improving endpoint carbon content during semisteel smelting medium carbon steel can comprise the following steps: going out in the process of half steel in ladle, the ferrosilicon of 3 ~ 8kg/ (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 the C of by weight percentage 3.20% ~ 3.80%, the Si of 0.001% ~ 0.05%, the temperature of described half steel is 1320 ~ 1390 DEG C, preferably, half steel temperature is higher, ferrosilicon add-on is lower, half steel temperature is lower, ferrosilicon add-on is higher, then be blended in steel melting furnace by half steel, lower oxygen gun blowing is smelted and is added relevant slag making materials and alloy by blowing requirement, re-blows, controls 0.20% ~ 0.30% by molten steel endpoint carbon content, propose oxygen rifle, stop blowing after catch carbon according to carbon content.Preferably, in the method for this exemplary embodiment, the add-on of ferrosilicon can be the ferrosilicon of 4.5 ~ 6.5kg/ (t half steel).
In another exemplary embodiment of the present invention, the method improving endpoint carbon content during semisteel smelting medium carbon steel can comprise the following steps: after half steel is blended into steel-making converter, the ferrosilicon of 3 ~ 8kg/ (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 containing the C of 3.20% ~ 3.80%, the Si of 0.001% ~ 0.05% by weight percentage, the temperature of described half steel is 1320 ~ 1390 DEG C; Then descend oxygen gun blowing to smelt and add relevant slag making materials and alloy by blowing requirement, re-blowing according to carbon content after catch carbon, molten steel endpoint carbon content is controlled 0.20% ~ 0.30%, propose oxygen rifle, stop blowing.Preferably, in the method for this exemplary embodiment, the add-on of ferrosilicon can be the ferrosilicon of 4.5 ~ 6.5kg/ (t half steel).
In another exemplary embodiment of the present invention, the method improving endpoint carbon content during semisteel smelting medium carbon steel can comprise the following steps: after half steel is blended into steel-making converter, after lower oxygen gun blowing smelts 0.5 ~ 1min, the ferrosilicon of 1 ~ 4kg/ (t half steel) is joined in steel-making converter, adds relevant slag making materials and alloy by blowing requirement simultaneously, the ferrosilicon of 2 ~ 4kg/ (t half steel) is added again (such as according to carbon content and temperature after catch carbon, during the carbon content >0.50% of molten steel or temperature >1650 DEG C, ferrosilicon add-on is the ferrosilicon of 2kg/ (t half steel), during the carbon <0.40% of molten steel or temperature <1620 DEG C, ferrosilicon add-on is the ferrosilicon of 4kg/ (t half steel), when the carbon content of molten steel is greater than 0.40% and is less than 0.50% or when temperature is greater than 1620 DEG C and is less than 1650 DEG C, carbon content is lower or temperature is lower, then now ferrosilicon add the higher value measured in 2 ~ 4kg/ (t half steel) scope, when carbon content of molten steel is higher or temperature is higher, then now ferrosilicon add the smaller value measured in 2 ~ 4kg/ (t half steel) scope), re-blow the scheduled time, so that molten steel endpoint carbon content is controlled 0.20% ~ 0.30%, 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 the C of by weight percentage 3.20% ~ 3.80%, the Si of 0.001% ~ 0.05%, the temperature of described half steel is 1320 ~ 1390 DEG C.Preferably, in the method for this exemplary embodiment, the add-on of the ferrosilicon of lower oxygen gun blowing blowing step and step of re-blowing is the ferrosilicon of 2.5 ~ 3.5kg/ (t half steel).
When raising semisteel smelting medium carbon steel of the present invention endpoint carbon content method in, described relevant slag making materials and alloy are lime, high magnesium lime, composite fluxing medium and steel-making alloy, wherein, containing 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.When raising semisteel smelting medium carbon steel of the present invention endpoint carbon content method in, ferrosilicon can containing by weight percentage more than 75% Si.
In another exemplary embodiment of the present invention, Semi-steel making method comprises the method for endpoint carbon content when adopting raising semisteel smelting medium carbon steel as above to improve the carbon content of endpoint molten steel.
Below in conjunction with the description exemplary embodiment of the present invention of 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 the C of 3.52%, the Si of 0.01% by weight percentage, and the temperature of half steel is 1380 DEG C.
Going out in the process of half steel in ladle, the ferrosilicon of 3kg/ (t half steel) is being joined in ladle; Then half steel is blended in steel melting furnace, lower oxygen gun blowing is smelted and is added the lime of 35kg/ (t half steel), 15kg/ (t half steel) high magnesium lime, 1kg/ (t half steel) composite fluxing medium, initial stage slag formation time 2.2min, after liquid steel temperature reaches 1650 DEG C, propose oxygen rifle, stop blowing.The carbon content obtaining molten steel is 0.21%, and ton steel steel technology 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 the C of 3.47%, the Si of 0.01% by weight percentage, and the temperature of half steel is 1325 DEG C.
Going out in the process of half steel in ladle, the ferrosilicon of 8kg/ (t half steel) is being joined in ladle; Then half steel is blended in steel melting furnace, lower oxygen gun blowing is smelted and is added the lime of 36kg/ (t half steel), 10kg/ (t half steel) high magnesium lime, and initial stage slag formation time 2.2min, after liquid steel temperature reaches 1680 DEG C, propose oxygen rifle, stop blowing.The carbon content obtaining molten steel is 0.29%, and ton steel steel technology is 1050kg.
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 the C of 3.55%, the Si of 0.02% by weight percentage, and the temperature of half steel is 1375 DEG C.
After half steel is blended into steel-making converter, the ferrosilicon of 3kg/ (t half steel) is joined in steel-making converter; Then descend oxygen gun blowing to smelt and add lime, 13kg/ (t half steel) high magnesium lime of 32kg/ (t half steel), initial stage slag formation time 3.1min, after liquid steel temperature reaches 1670 DEG C, proposing oxygen rifle, stop blowing.The carbon content obtaining molten steel is 0.26%, and ton steel steel technology 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 the C of 3.72%, the Si of 0.03% by weight percentage, and the temperature of half steel is 1325 DEG C.
After half steel is blended into steel-making converter, the ferrosilicon of 8kg/ (t half steel) is joined in steel-making converter; Then descend oxygen gun blowing to smelt and add lime, 16kg/ (t half steel) high magnesium lime of 41kg/ (t half steel), initial stage slag formation time 3.5min, after liquid steel temperature reaches 1675 DEG C, proposing oxygen rifle, stop blowing.The carbon content obtaining molten steel is 0.29%, and ton steel steel technology 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 the C of 3.55%, the Si of 0.02% by weight percentage, and the temperature of half steel is 1370 DEG C.
After half steel is blended into steel-making converter, the ferrosilicon of 1kg/ (t half steel) joins in steel-making converter after smelting 1min by lower oxygen gun blowing; Add the lime of 38kg/ (t half steel), 12kg/ (t half steel) high magnesium lime simultaneously, initial stage slag formation time 2.5min, after the ferrosilicon adding 4kg/ (t half steel) after catch carbon is re-blow and reached 1665 DEG C to liquid steel temperature, propose oxygen rifle, stop blowing.The carbon content obtaining molten steel is 0.21%, and ton steel steel technology 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 the C of 3.45%, the Si of 0.01% by weight percentage, and the temperature of half steel is 1350 DEG C.
After half steel is blended into steel-making converter, the ferrosilicon of 4kg/ (t half steel) joins in steel-making converter after smelting 1min by lower oxygen gun blowing; Add the lime of 37kg/ (t half steel), 13kg/ (t half steel) high magnesium lime simultaneously, initial stage slag formation time 3min, after the ferrosilicon adding 2kg/ (t half steel) after catch carbon is re-blow and reached 1650 DEG C to liquid steel temperature, propose oxygen rifle, stop blowing.The carbon content obtaining molten steel is 0.28%, and ton steel steel technology is 1049kg.
The problem that when the present invention effectively can solve steelworks semisteel smelting medium carbon steel, molten steel endpoint carbon content is low; The heat-transmission of steelmaking process elemental oxygen can be increased, liquid steel temperature is controlled in claimed range, reduce the oxidation of carbon and iron in steel simultaneously, reduce steel technology, improve semi-steel making because slagging element is few the problem of slag making difficulty; In the quick formation better promoting steelmaking slag, converter control liquid steel temperature and endpoint carbon content can be conducive to, be conducive to improving semi-steel making level of control.
Although describe the present invention in conjunction with exemplary embodiment above, those of ordinary skill in the art should be clear, when not departing from the spirit and scope of claim, can carry out various amendment to above-described embodiment.
Claims (3)
1. improve a method for endpoint carbon content during semisteel smelting medium carbon steel, it is characterized in that, said method comprising the steps of:
After half steel is blended into steel-making converter, after lower oxygen gun blowing smelts 0.5 ~ 1min, the ferrosilicon of 1 ~ 4kg/ (t half steel) is joined in steel-making converter, add relevant slag making materials and alloy by blowing requirement simultaneously, described relevant slag making materials and alloy are lime, high magnesium lime, composite fluxing medium and steel-making alloy, containing SiO in described composite fluxing medium
216% ~ 20%, the CaO of Mn 10% ~ 15% and surplus;
Add the ferrosilicon of 2 ~ 4kg/ (t half steel) after catch carbon, re-blow, molten steel endpoint carbon content is controlled 0.20% ~ 0.30%, 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 the C of 3.20% ~ 3.80%, the Si of 0.001% ~ 0.05% by weight percentage, and the temperature of described half steel is 1320 ~ 1390 DEG C.
2. the method for endpoint carbon content during raising semisteel smelting medium carbon steel according to claim 1, is characterized in that, the add-on of the ferrosilicon of described lower oxygen gun blowing blowing step and described step of re-blowing is the ferrosilicon of 2.5 ~ 3.5kg/ (t half steel).
3. a Semi-steel making method, is characterized in that, described Semi-steel making method comprises the method for endpoint carbon content when adopting raising semisteel smelting medium carbon steel according to claim 1 to improve the carbon content of endpoint molten steel.
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| CN104060019B (en) * | 2014-03-19 | 2016-04-27 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of Semi-steel making method |
| CN103966388B (en) * | 2014-04-28 | 2015-09-30 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method shortening the semisteel converter steelmaking of pure oxygen blow duration |
| CN103966399B (en) * | 2014-05-06 | 2016-08-10 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of semisteel smelting medium carbon steel |
| CN103966387B (en) * | 2014-05-15 | 2016-01-06 | 攀钢集团攀枝花钢钒有限公司 | Adopt the method for semi-steel making |
| 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 |
| CN103993119B (en) * | 2014-06-06 | 2016-04-13 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of half steel slag making |
| CN103993123B (en) * | 2014-06-06 | 2016-02-03 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of molten iron and steel and semi-steel making reduction terminal oxygen level |
| CN103993121B (en) * | 2014-06-06 | 2016-02-03 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of molten iron and steel and semi-steel making raising medium and high carbon steel end point carbon |
| 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 |
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| CN101696462B (en) * | 2009-11-03 | 2011-06-29 | 攀钢集团研究院有限公司 | Method for producing low phosphorus steel by smelting semisteel |
| CN102766722B (en) * | 2012-07-17 | 2014-04-02 | 攀钢集团研究院有限公司 | Method for smelting high-carbon steel from semi-steel |
| CN103205524B (en) * | 2013-04-15 | 2015-04-15 | 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 |
| CN103642971B (en) * | 2013-11-13 | 2015-11-04 | 攀钢集团研究院有限公司 | Improve method and the Semi-steel making method of semi-steel making endpoint carbon content |
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