CN109929963A - A kind of deoxidation in steel making method in LF furnace refining process - Google Patents
A kind of deoxidation in steel making method in LF furnace refining process Download PDFInfo
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- CN109929963A CN109929963A CN201910268877.1A CN201910268877A CN109929963A CN 109929963 A CN109929963 A CN 109929963A CN 201910268877 A CN201910268877 A CN 201910268877A CN 109929963 A CN109929963 A CN 109929963A
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Abstract
The invention belongs to deoxidation in steel making technical fields, more particularly to a kind of deoxidation in steel making method in LF furnace refining process, enter in LF furnace after Argon, heating in ladle, coal is added into LF furnace or coal product carries out deoxidation in steel making, optimize slagging speed, reduce the consumption of slag making aluminium, reduce steel-making cost, simultaneously because the reaction product of coal and oxygen is gas, it will not remain on and pollute molten steel in steel, and can also stir molten steel while bubble floating, not only uniform temperature and ingredient, also by steel pernicious gas and nonmetal inclusion take out of, be conducive to purify molten steel；Desulfurization can be reduced and return silicon risk.
Description
Technical field
The invention belongs to deoxidation in steel making technical fields, and in particular to a kind of deoxidation in steel making side in LF furnace refining process
Method.
Background technique
The mode of deoxidation of molten steel mainly has precipitation desoxydation method, diffusive deoxidation method, vacuum deaeration method.
Precipitation desoxydation: the affinity with oxygen is better than the element of iron with shapes such as ferroalloy or metal blocks by also referred to as direct deoxidation
Formula is applied directly in molten steel, and the density for generating Precipitation the object MxOy, MxOy insoluble in molten steel with oxygen is less than the density of molten steel,
And the exclusion that can float.
Diffusive deoxidation: being referred to and reacted using the deoxidier being added in clinker with FeO, and FeO content in molten steel is reduced, and destroys FeO
Concentration balance in clinker and molten steel spreads FeO in steel into slag.Since this deoxidation process is indirectly complete by clinker
At, so also known as indirect deoxidation method.
Vacuum deaeration: being that molten steel is placed under vacuum state, breaks the equilibrium state before original [C], [O], causes
[C], [O] the reaction was continued, that is, the oxygen in steel is taken off using the carbon in steel, but molten steel also has some residual after cycling
Oxygen still needs to carry out deoxidation using deoxidier.
Existing deoxidier type is mainly by shape containing aluminium, silicon, the ferroalloy of manganese element, metallic aluminium after reacting with oxygen
At oxide, have part and remain in molten steel, influence steel quality, while such deoxidier price is higher, increase steel-making at
This.
Based on steel quality is improved, reduces steel-making cost angle and consider, part steel mill mainly uses carburant, coke, coke
The materials such as fourth, calcium carbide carry out deoxidation, and there are two types of the conventional practices of converter current carbon deoxidation alloying: first method is
Remaining alloy (including deoxygenated alloy is added before steel first plus in deoxidation carburant to ladle, after tapping after carburant reaction
And composition alloy).This operating method there are the problem of: since carburant is in tank bottom, the gas generated is reacted with molten steel by steel
Water-stop occurs splash after compression, causes security risk.Second method is that deoxidation carburant is first added in tapping process,
Carry out other alloying operations, spy of this operating method due to carburant, nut coke class product again after carburant deoxygenation
Property, reaction speed is slow, easily increases the carbon content in molten steel after addition is excessive, floats to have in ladle top slag at the end of tapping and not melt
Carburant.
Summary of the invention
In order to solve the above technical problem, the present invention provides a kind of deoxidation in steel making method in LF furnace refining process, at
Slag speed is fast, at low cost, and deoxidation effect is good.
The invention is realized in this way a kind of deoxidation in steel making method in LF furnace refining process, enters LF furnace in ladle
After middle Argon, heating, coal is added into LF furnace or coal product carries out deoxidation in steel making.
Further, the above method includes the following steps:
1) after ladle enters LF furnace, Argon stirs to get refining liquid steel；
2) in temperature-rise period, coal or coal product is added and slag making materials carry out deoxidation and slag making；
3) it carries out feeding silk operation after deoxidation slag making alloying, it is leaving from station later to pour steel to casting machine.
Further, Argon mixing time is 2-4min.
Further, it is medium carbon steel kind when smelting steel grade, when step 2) heats up beginning, further includes following steps: starting
When heating, using the low-voltage starting the arc of 150-250V, after clinker submerged arc, voltage is gradually increased according to submerged arc situation and increasing extent of temperature
To 300-480V.
Further, the slag making materials in step 3) are the mixture of lime or lime fluorite, lime adding amount 4-
8kg/ tons of steel, fluorite additional amount are 0.6-1.2Kg/ tons of steel.
Further, in step 2), coal or coal product are added in batches, the content for the coal being added every time is 10-40kg,
Every furnace divide 3-7 times addition, every time between be spaced 1-3min.
Further, the mass percent of coal is 40-95% in the coal product.
Further, the coal is anthracite, and the coal product is with anthracite coal product as main component.
Further, granularity≤50mm of the coal or coal product.
Compared with the prior art, the advantages of the present invention are as follows:
Optimize slagging speed, reduce the consumption of slag making aluminium, reduces steel-making cost (reducing by 4.99 yuan of ton steel cost), simultaneously because
The reaction product of coal and oxygen is gas, will not remain on and pollute molten steel in steel, and can also stir steel while bubble floating
Water, not only uniform temperature and ingredient, also by steel pernicious gas and nonmetal inclusion take out of, be conducive to purify molten steel；It can
Silicon risk is returned to reduce desulfurization.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment, to the present invention
It is further elaborated.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, it is not used to
Limit the present invention.
The refining of LF furnace is one of main method of external refining, crucial to make white slag in quick.The purpose of LF slag making is de-
The problems such as sulphur, deoxidation, raising yield of alloy, removal are mingled with, but in slagging process, return silicon, rephosphorization, nitrogen pick-up there are desulfurization needs
Reasonable slagging regime is wanted to control.
For the problems in background technique, this patent is in anthracite, lean coal, coking coal, rich coal, bottle coal, bituminous coal, half smokeless
Go out to use anthracite deoxidization technique by comparative experimental study in the coal of the kinds such as coal, lignite, can effectively solve carburant, coke
The reaction of the materials such as charcoal, nut coke, calcium carbide appearance when carrying out deoxidation is slow, carburetting, and deoxidation effectiveness is not high and easily influences molten steel
The production and safety problem such as splash.
This patent uses anthracite or makes by product (anthracite matches 40-95%) substitution aluminium ball of main material of anthracite
Slag, at guarantee " white slag ", save steel-making cost, anthracite or using anthracite as main material product (anthracite match
40-95%) reaction product is gas, does not pollute molten steel, reduces and is mingled in steel.
Embodiment 1 smelts rectangular bloom steel grade
1) after ladle enters LF furnace, Argon stirs to get refining liquid steel, and Argon mixing time is 2min, if carbon before argon
Powder fusing need to refine 5-10min after once electrification, can take sample before refining, measure ladle top slag thickness；
2) in temperature-rise period, anthracite (granularity≤50mm) is added and slag making materials carry out deoxidation and slag making, anthracite point
Batch be added, the anthracite being added every time be 20kg, add 5 times, every time between be spaced 1min, until deoxidation slag making terminates；
Slag making materials are lime and fluorite, and according to the tonnage of molten steel, lime adding amount 1200kg, fluorite is 200 ㎏；
3) carry out feeding silk operation after deoxidation slag making alloying, after ingredient, temperature meet steel grade regulatory requirements after argon, it is leaving from station extremely
Casting machine pours steel.
Embodiment 2, low-carbon low-silicon steel
1) after ladle enters LF furnace, Argon stirs to get refining liquid steel, Argon stir the side 3min can thermometric sampling, measurement
Ladle top slag thickness；
2) in temperature-rise period, anthracite (granularity≤50mm) is added and slag making materials carry out deoxidation and slag making, anthracite point
Batch be added, the anthracite being added every time be 10kg, add 5 times, every time between be spaced 2min, until deoxidation slag making terminates；
Slag making materials are lime, according to the tonnage of molten steel, lime adding amount 700kg, need in slagging process to take slag specimen into
A small amount of aluminum products are added according to desulfurization situation, to guarantee white slag as standard in row comparison；
3) carry out feeding silk operation after deoxidation slag making alloying, after ingredient, temperature meet steel grade regulatory requirements after argon, it is leaving from station extremely
Casting machine pours steel.
Embodiment 3, weathering steel (SPA-H)
1) after ladle enters LF furnace, Argon stirs to get refining liquid steel, Argon stir the side 3min can thermometric sampling, measurement
Ladle top slag thickness；
2) in temperature-rise period, anthracite (granularity≤50mm) is added and slag making materials carry out deoxidation and slag making, anthracite point
Batch be added, the anthracite being added every time be 10kg, add 5 times, every time between be spaced 3min, until deoxidation slag making terminates；
Slag making materials are lime, according to the tonnage of molten steel, lime adding amount 1200kg, need in slagging process to take slag specimen into
A small amount of aluminum products are added according to desulfurization situation in row comparison, using guarantee white slag as standard, the control of refining carbon increasing amount 0.01% with
Under, finished product sulphur control 0.006% is hereinafter, refining tundish temperature is controlled at 1545-1554 DEG C；Refining controlling finished product calcium aluminium ratio
0.05-0.07, middle packet ALs control is in 0.015-0.023%；
3) carry out feeding silk operation after deoxidation slag making alloying, after ingredient, temperature meet steel grade regulatory requirements after argon, it is leaving from station extremely
Casting machine pours steel.
Embodiment 4, straight carbon steel
1) after ladle enters LF furnace, Argon stirs to get refining liquid steel, at least the Argon stirring side 3min can thermometric sampling,
Measure ladle top slag thickness；
2) in temperature-rise period, starting voltage is 180V, steps up voltage to 220V, anthracite is added in temperature-rise period
For the progress deoxidation of product (granularity≤50mm) (anthracite proportion 40%) and slag making materials and slag making of main material, based on anthracite
The product of raw material is added in batches, and the anthracite being added every time is that the product anthracite content of main material is 20kg, adds 6 times, often
1min is spaced between secondary, until deoxidation slag making terminates；
Slag making materials are lime, according to the tonnage of molten steel, lime adding amount 800kg.
3) carry out feeding silk operation after deoxidation slag making alloying, after ingredient, temperature meet steel grade regulatory requirements after argon, it is leaving from station extremely
Casting machine pours steel.
Embodiment 5, pipe line steel
1) after ladle enters LF furnace, Argon stirs to get refining liquid steel, at least the Argon stirring side 3min can thermometric sampling,
Measure ladle top slag thickness；
2) in temperature-rise period, be added using anthracite as the product (granularity≤50mm) (anthracite proportion 95%) of main material and
Slag making materials carry out deoxidation and slag making, are added in batches by the product of main material of anthracite, are added based on anthracite every time
The product anthracite content of raw material be 10kg, add 3 times, every time between be spaced how long 2min, until deoxidation slag making terminates；
Slag making materials are lime and fluorite, according to the tonnage of molten steel, lime adding amount 1300kg, fluorite 150kg,
It needs that slag specimen is taken to compare in slagging process, is added 20 to 60Kg aluminium ball, to guarantee white slag as standard according to desulfurization situation；
3) carry out feeding silk operation after deoxidation slag making alloying, after ingredient, temperature meet steel grade regulatory requirements after argon, it is leaving from station extremely
Casting machine pours steel.
The depth desulfurization steel grade such as embodiment 6, wheel, beam steel
1) after ladle enters LF furnace, Argon stirs to get refining liquid steel, at least the Argon stirring side 3min can thermometric sampling,
Measure ladle top slag thickness；
2) it in temperature-rise period, is added and is carried out by the product (anthracite proportion 60%) and slag making materials of main material of anthracite
Deoxidation and slag making are added in batches by the product product of main material of anthracite, be added every time using anthracite as main material
In product smokeless coal quality be 10kg, add 5 times, every time between be spaced how long 3 min, until deoxidation slag making terminates；
Slag making materials are lime, according to the tonnage of molten steel, lime adding amount 1000kg, need in slagging process to take slag specimen into
Row comparison is added 20 to 60Kg aluminium ball, to guarantee white slag as standard according to desulfurization situation.
3) carry out feeding silk operation after deoxidation slag making alloying, after ingredient, temperature meet steel grade regulatory requirements after argon, it is leaving from station extremely
Casting machine pours steel.
Each ingredient of smokeless coal product in embodiment 4,5,6 are as follows: anthracite, lime, aluminium ash, fluorite, these ingredients are by conjunction
Suitable ratio forms smokeless coal product.
Comparative example,
It is tested according to the parameter in table:
Certain steel mill is largely tested in the path LF steel grade at present, compares traditional slagging process, is used at present
The aluminium of 84kg anthracite (or using anthracite as the product of main material) the progress alternative 70kg of slag making.
Cost calculation:
1200 yuan/ton of coal price lattice, 13854 yuan/ton of aluminium ball price
The cost of 84kg coal: 84 × 1.2=100.8 member
The cost of 70kg aluminium ball: 70 × 13.854=969.78 member
Cost is reduced after substitution:
969.78-100.8=868.98 first.
Every furnace can reduce by 868.98 yuan of cost, and it is 174 tons that the average furnace of plate steel mill, which produces, 868.98 ÷ 174=4.99
Yuan/ton steel.
Claims (9)
1. a kind of deoxidation in steel making method in LF furnace refining process, which is characterized in that enter Argon in LF furnace, heating in ladle
Afterwards, coal is added into LF furnace or coal product carries out deoxidation in steel making.
2. the deoxidation in steel making method described in accordance with the claim 1 in LF furnace refining process, which is characterized in that including walking as follows
It is rapid:
1) after ladle enters LF furnace, Argon stirs to get refining liquid steel；
2) in temperature-rise period, coal or coal product is added and slag making materials carry out deoxidation and slag making；
3) it carries out feeding silk operation after deoxidation slag making alloying, it is leaving from station later to pour steel to casting machine.
3. the deoxidation in steel making method in LF furnace refining process according to claim 2, which is characterized in that when Argon stirs
Between be 2-4min.
4. the deoxidation in steel making method in LF furnace refining process according to claim 2, which is characterized in that when smelting steel grade
It further include following steps: when starting to warm up, using the low-voltage of 150-250V when step 2) heats up beginning for medium carbon steel kind
The starting the arc after clinker submerged arc, is gradually increased voltage to 300-480V according to submerged arc situation and increasing extent of temperature.
5. the deoxidation in steel making method in LF furnace refining process according to claim 2, which is characterized in that in step 3)
Slag making materials are the mixture of lime or lime fluorite, and lime adding amount is 4-8kg/ tons of steel, and fluorite additional amount is 0.6-1.2
Kg/ tons of steel.
6. the deoxidation in steel making method in LF furnace refining process according to claim 2, which is characterized in that in step 2),
Be added coal or coal product in batches, the content for the coal being added every time is 10-40kg, and every furnace divides 3-7 addition, it is each between be spaced
1-3min。
7. the deoxidation in steel making method in LF furnace refining process according to claim 2, which is characterized in that the coal product
The mass percent of middle coal is 40-95%.
8. the deoxidation in steel making method in LF furnace refining process according to claim 2, which is characterized in that the coal is nothing
Bituminous coal, the coal product are with anthracite coal product as main component.
9. the deoxidation in steel making method in LF furnace refining process according to claim 2, which is characterized in that the coal or coal
Granularity≤50mm of product.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736194A (en) * | 2008-11-19 | 2010-06-16 | 攀钢集团研究院有限公司 | Wheel steel and preparation method as well as wheel thereof |
| CN107299282A (en) * | 2017-05-27 | 2017-10-27 | 内蒙古包钢钢联股份有限公司 | Car crankshaft and its production method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736194A (en) * | 2008-11-19 | 2010-06-16 | 攀钢集团研究院有限公司 | Wheel steel and preparation method as well as wheel thereof |
| CN107299282A (en) * | 2017-05-27 | 2017-10-27 | 内蒙古包钢钢联股份有限公司 | Car crankshaft and its production method |
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Application publication date: 20190625 |