CN104988272B - Output steel deoxidizing process under semisteel catching carbon practice condition - Google Patents
Output steel deoxidizing process under semisteel catching carbon practice condition Download PDFInfo
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Abstract
The invention belongs to the technical field of metallurgy, and particularly relates to an output steel deoxidizing process under the semisteel catching carbon practice condition. The process includes the steps that when the percentage mass content of carbon in molten steel at the end point of a converter is larger than or equal to 0.10% and smaller than 0.20%, carburant is added for preliminary deoxidization when steel is output by one third; a deoxidizing agent is added for thorough deoxidization on a blowing-argon-behind-converter platform after steel is completely output; when the percentage mass content of carbon in molten steel at the end point of the converter is larger than or equal to 0.20%, the output steel is not deoxidized, the deoxidizing agent is directly added for oxygen determination on the blowing-argon-behind-converter platform, the deoxidizing agent is added according to the oxygen determination value, and argon is blown to ladle bottoms when and after steel is output. By means of the process, deoxidization material consumption can be lowered, production cost can be reduced, and meanwhile the nitrogen increase volume in the steel output process can be reduced.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to a kind of semi-steel making converter tapping deoxidization technique.
Background technology
Research finds, closely related, the converter such as the control of aim carbon and steel technology, alloy material consumption in smelting iron and steel
During steel-making, terminal point control has two methods, and one kind is homlolgation, that is, carbon of tapping is relatively low, and tapping process adds carburant to enter molten steel
Row carburetting.Homlolgation has relatively low phosphorus content in can guarantee that endpoint molten steel, but high furnace lining, the molten steel oxygen of corroding of slag beneficiation is lived
Degree is high to increase deoxidizer consumption also reduces yield of alloy, and backward ladle of tapping adds substantial amounts of carburant, composition fluctuation compared with
Greatly；Another kind of method is that highcasting speed is re-blow method, and so-called " highcasting speed method " refers to that molten bath phosphorus content reaches and blow
Oxygen, now in molten bath, not only sulfur phosphorus and temperature meet the requirements, and the carbon after counting the carbon that ferroalloy is brought in metal, in molten steel
The specification requirement of institute's steelmaking kind can also be met.The method tapping carbon content is higher, general >=0.20%, steel oxygen content in water is relatively low
(being generally not more than 400ppm), yield of alloy are relatively high and stable while saving a large amount of carburants, height draws the method for making steel re-blow
It is usually used in producing medium and high carbon steel.Domestic molten iron-steelmaking enterprise is turned when medium and high carbon steel is produced by the optimization to converter smelting process
Furnace foundation instinct realizes that highcasting speed is tapped.Above-mentioned raw materials consumption is advantageously reduced using catch carbon practice；To improving the inherence of steel
Quality is beneficial to；Catch carbon practice is very beneficial to improving lining durability simultaneously.
Application No. " 201010267141.1 ", entitled " low-carbon and low-silicon steel deoxidation process " discloses a kind of turning
Stove terminal oxygen content carries out converter tapping in more than 500ppm, adds carbon dust to carry out thick deoxidation when tapping is started, in tapping
Add ferro-aluminum to carry out deoxidation alloying when 1/2 or 2/3, ferro-aluminum is added according to ladle oxygen content then.Converter tapping in the patent
Endpoint carbon content is 0.05%, adds ferro-aluminum to carry out full deoxidation and causes deoxygenated alloy consumption larger, and tapping process increases during tapping
Nitrogen is than more serious.
Qi Zhiyu etc.《Converter high-carbon steel Study on Smelting Process and application》The steel-making of Anshan iron and steel plant two is described in one text for solving to turn
Stove smelting high carbon steel dephosphorization, guarantor's carbon, temperature raising three are difficult to the problem while realizing, by staying the quantity of slag, bottom blowing flow, oxygen to terminal
The optimization of rifle rifle position and terminal point control finally realizes height and draws method smelting high carbon steel of re-blowing, and achieves preferable effect.But
Without reference to concrete deoxidization technique during converter smelting high-carbon steel in text.
At present mostly semi-steel making enterprise due in the half steel that obtains after desulfurization vanadium extraction carbon weight/mass percentage composition it is low by (3.4%
～4.0%), in half steel, silicon, manganese heating slagging constituent content are vestige, and slag making is mostly acid using adding during semisteel smelting
Slag making materials so that smelting process thermal source wretched insufficiency, can only be tapped so as to realize highcasting speed by half steel thermal compensation, so be increased
Cost is added.And, in steelmaking process, nitrogen can in most cases become harmful element in steel, and nitrogen in steel content height can drop
The formability of low steel, welding performance and high temperature toughness and plasticity, while exacerbating steel timeliness and cold short, nitrogen can also be caused in addition
The cracking of steel billet.So, in steelmaking process, need the increment of strict control nitrogen, it is ensured that the quality of steel.
Therefore, deoxidation material consumption can be reduced under the conditions of developing a kind of semisteel smelting highcasting speed, and can be reduced and tapped
The tapping deoxidization technique of journey nitrogen increased amount is very necessary.
The content of the invention
Under above-mentioned purpose, the present invention provides the tapping deoxidization technique under the conditions of a kind of semisteel smelting highcasting speed, the technique
Deoxidation material consumption can be reduced, production cost is reduced, while tapping process nitrogen increased amount can be reduced.
Tapping deoxidization technique under the conditions of half steel highcasting speed of the present invention, for the quality percentage of semi-steel making endpoint molten steel carbon
The heat of content >=0.10%：
As the weight/mass percentage composition ＜ 0.20% of 0.10%≤carbon in converter terminal molten steel, according to carburetting during tapping 1/3
The gauge of agent 0.1～0.3kg/ ton steel, adds carburant to carry out pre-deoxidation on molten steel；Tapping is entered in furnace rear Argon platform after terminating
Row determine oxygen, it is ensured that molten steel oxygen activity ＞ 50ppm, determines after oxygen terminates, and according to the gauge of 2～3m/ ton steel, addition aluminum steel is carried out thoroughly
Deoxidation；
When weight/mass percentage composition >=0.20% of carbon in converter terminal molten steel, not deoxidation of tapping, directly in furnace rear Argon
Platform carries out determining oxygen, adds aluminum steel deoxidation according to oxygen value is determined according to the gauge of 3～4m/ ton steel；
To steel ladle bottom argon blowing when above-mentioned tapping process and tapping end addition deoxidizer aluminum steel.
The molten steel that endpoint molten steel of the present invention is finally given after referring to converter, using sublance to molten steel in converter before tapping
Sampling is measured, the content of wherein carbon is determined；The present invention selects to add deoxidizer to be because if deoxidizer in tapping 1/3
Add half cylinder of steel to be easily caused tapping process " blowing out " in advance, cause security incident, if early stage flue dust is added after tapping 1/3
It is larger, do not reach the purpose of smoke abatement；Tapping carries out determining oxygen in furnace rear Argon platform after terminating, it is ensured that molten steel oxygen activity ＞
50ppm, is the presence energy of oxygen content in order to reduce tapping process nitrogen pick-up, because oxygen content in steel is molten steel surface active substance
Effective isolation air, prevents the nitrogen in air from entering in molten steel.
Tapping deoxidization technique under the conditions of half steel highcasting speed described above, the carburant of addition are to commonly use in steelmaking process
At least one of carburant, such as the carburetting pig iron, electrode powder, petroleum coke powder, charcoal powder, anthracite, coke blacking.
Further, the content of carbon in steel, wherein, the increasing in order that carbon content reaches the requirement of top phase in steel, are increased
Carbon agent is preferably the anthracite of carbon content >=90%, because anthracite carburant impurity is few, temperature drop is little, recovery rate is stable.
Tapping deoxidization technique under the conditions of half steel highcasting speed described above, when the matter of 0.10%≤carbon in converter terminal molten steel
During amount percentage composition ＜ 0.20%, it is 0.002m in 1/3～2/3 period steel ladle bottom argon blowing air supply intensity of tapping3/ (min t steel)
～0.003m3/ (min t steel)；When other tapping stages and tapping feed aluminum steel after terminating, BOTTOM ARGON BLOWING air supply intensity is
0.001m3/ (min t steel)～0.0015m3/ (min t steel).Wherein, adopt in 1/3～2/3 period steel ladle bottom argon blowing of tapping
Larger air supply intensity；Using less air supply intensity after other tapping stages and tapping terminate；After being because tapping 2/3
Easily make molten steel seethe out ladle to cause security incident as bottom blowing gas intensity is excessive, while tap later stage and line feeding process such as bottom
Blowing air supply intensity and crossing conference causes the violent nitrogen pick-up of molten steel.
When weight/mass percentage composition >=0.20% of carbon in converter terminal molten steel, in 1/3～2/3 period ladle bottom blowing of tapping
Argon air supply intensity is 0.002m3/ (min t steel)～0.003m3/ (min t steel)；Other tapping stages and add deoxidizer
When steel ladle bottom argon blowing air supply intensity be 0.001m3/ (min t steel)～0.0015m3/ (min t steel), when adding deoxidizer deoxidation
Argon bottom-blowing is that tapping process carries out Argon to ladle and is more beneficial for uniform molten steel in order to prevent deoxidation process molten steel from seething suction nitrogen
Composition and temperature, because tapping process also needs to carry out deoxidation and alloying operation.
Tapping deoxidization technique under the conditions of half steel highcasting speed, the deoxidizer are the conventional deoxidizer of steel-making, such as Si-Al-Ba-Ca
At least one of ferrum, silico-calcium core-spun yarn, aluminum steel, aluminum ferromanganese, steel-core-aluminium, carbide, carborundum, its Main Function are molten with molten iron
The oxygen reaction of solution, mainly generates nonmetallic compound, forms precipitation and floats up in slag blanket, obtains pure ferrum by being removed
Water.
In order that the thorough deoxidation of semi-steel making, the deoxidizer is preferably strong deoxidizer aluminum steel, and wherein aluminium content >=
90%, its a diameter of 10mm.
Tapping deoxidization technique under the conditions of semisteel smelting highcasting speed of the present invention, terminates the matter of carbon in rear steel mainly for tapping
The situation of amount percentage composition >=0.10%, while and the weight/mass percentage composition ＜ 0.20% for 0.10%≤carbon and the quality of carbon
Percentage composition >=0.20% two kind situation, has formulated different tapping deoxidization techniques, and it is de- to carry out segmentation in tapping process
Oxygen, it is ensured that deoxidation is thorough, and molten steel oxygen activity nitrogen pick-up after more than 50ppm, the conventional disposable deoxidation of present invention ratio after deoxidation
Amount is less, and molten steel oxygen activity is higher.Deoxidization technique of the present invention can effectively reduce deoxidation material consumption, reduce production cost, save
Resource, meanwhile, tapping process nitrogen increased amount can be reduced, it is ensured that be more or less the same before nitrogen content and tapping in final steel, it is ensured that steel
Performance.
Specific embodiment
Tapping deoxidization technique under the conditions of half steel highcasting speed of the present invention, for the quality percentage of semi-steel making endpoint molten steel carbon
The heat of content >=0.10%：
As the weight/mass percentage composition ＜ 0.20% of 0.10%≤carbon in converter terminal molten steel, according to carburetting during tapping 1/3
The gauge of agent 0.1～0.3kg/ ton steel, adds carburant to carry out pre-deoxidation on molten steel；Tapping is entered in furnace rear Argon platform after terminating
Row determine oxygen, it is ensured that molten steel oxygen activity ＞ 50ppm, determines after oxygen terminates, and according to the gauge of 2～3m/ ton steel, addition aluminum steel is carried out thoroughly
Deoxidation；
When weight/mass percentage composition >=0.20% of carbon in converter terminal molten steel, not deoxidation of tapping, directly in furnace rear Argon
Platform carries out determining oxygen, adds aluminum steel deoxidation according to oxygen value is determined according to the gauge of 3～4m/ ton steel；
To steel ladle bottom argon blowing when above-mentioned tapping process and tapping end addition deoxidizer aluminum steel.
The molten steel that endpoint molten steel of the present invention is finally given after referring to converter, using sublance to molten steel in converter before tapping
Sampling is measured, the content of wherein carbon is determined；The present invention selects to add deoxidizer to be because if deoxidizer in tapping 1/3
Add half cylinder of steel to be easily caused tapping process " blowing out " in advance, cause security incident, if early stage flue dust is added after tapping 1/3
It is larger, do not reach the purpose of smoke abatement；Tapping carries out determining oxygen in furnace rear Argon platform after terminating, it is ensured that molten steel oxygen activity ＞
50ppm, is the presence energy of oxygen content in order to reduce tapping process nitrogen pick-up, because oxygen content in steel is molten steel surface active substance
Effective isolation air, prevents the nitrogen in air from entering in molten steel.
Tapping deoxidization technique under the conditions of half steel highcasting speed described above, the carburant of addition are to commonly use in steelmaking process
At least one of carburant, such as the carburetting pig iron, electrode powder, petroleum coke powder, charcoal powder, anthracite, coke blacking.
Further, the content of carbon in steel, wherein, the increasing in order that carbon content reaches the requirement of top phase in steel, are increased
Carbon agent is preferably the anthracite of carbon content >=90%, because anthracite carburant impurity is few, temperature drop is little, recovery rate is stable.
Tapping deoxidization technique under the conditions of half steel highcasting speed described above, when the matter of 0.10%≤carbon in converter terminal molten steel
During amount percentage composition ＜ 0.20%, it is 0.002m in 1/3～2/3 period steel ladle bottom argon blowing air supply intensity of tapping3/ (min t steel)
～0.003m3/ (min t steel)；When other tapping stages and tapping feed aluminum steel after terminating, BOTTOM ARGON BLOWING air supply intensity is
0.001m3/ (min t steel)～0.0015m3/ (min t steel).Wherein, adopt in 1/3～2/3 period steel ladle bottom argon blowing of tapping
Larger air supply intensity；Using less air supply intensity after other tapping stages and tapping terminate；After being because tapping 2/3
Easily make molten steel seethe out ladle to cause security incident as bottom blowing gas intensity is excessive, while tap later stage and line feeding process such as bottom
Blowing air supply intensity and crossing conference causes the violent nitrogen pick-up of molten steel.
When weight/mass percentage composition >=0.20% of carbon in converter terminal molten steel, in 1/3～2/3 period ladle bottom blowing of tapping
Argon air supply intensity is 0.002m3/ (min t steel)～0.003m3/ (min t steel)；Other tapping stages and add deoxidizer
When steel ladle bottom argon blowing air supply intensity be 0.001m3/ (min t steel)～0.0015m3/ (min t steel), when adding deoxidizer deoxidation
Argon bottom-blowing is that tapping process carries out Argon to ladle and is more beneficial for uniform molten steel in order to prevent deoxidation process molten steel from seething suction nitrogen
Composition and temperature, because tapping process also needs to carry out deoxidation and alloying operation.
Tapping deoxidization technique under the conditions of half steel highcasting speed, the deoxidizer are the conventional deoxidizer of steel-making, such as Si-Al-Ba-Ca
At least one of ferrum, silico-calcium core-spun yarn, aluminum steel, aluminum ferromanganese, steel-core-aluminium, carbide, carborundum, its Main Function are molten with molten iron
The oxygen reaction of solution, mainly generates nonmetallic compound, forms precipitation and floats up in slag blanket, obtains pure ferrum by being removed
Water.
In order that the thorough deoxidation of semi-steel making, the deoxidizer is preferably strong deoxidizer aluminum steel, and wherein aluminium content >=
90%, its a diameter of 10mm.
The specific embodiment of the present invention is further described with reference to embodiment, not therefore by present invention limit
System is among described scope of embodiments.
Embodiment 1
No. 45 steel of converter smelting of certain factory's nominal capacity for 120t.Molten steel in converter is measured using sublance before tapping
Sampling, it is 0.10% to measure endpoint molten steel carbon content, and in molten steel, nitrogen content is 15ppm.Directly entered using anthracite after tapping 1/3
Row pre-deoxidation, anthracite addition are ton steel 0.1kg, and 1/3～2/3 period ladle bottom blowing of tapping adopts strong mixing, BOTTOM ARGON BLOWING to supply
Gas intensity is 0.002m3/(min·tSteel), other tapping stages adopt less air supply intensity 0.001m3/(min·tSteel), go out
Steel obtains molten steel oxygen activity for 70ppm in furnace rear Argon oxygen of standing firm after terminating, and determine after oxygen terminates, feeding aluminum steel ton steel 3m, line feeding
When control BOTTOM ARGON BLOWING intensity for 0.001m3/(min·tSteel), line feeding measures molten steel oxygen activity for 10ppm after terminating, nitrogen content is
17ppm, tapping process deoxygenated alloy consumption are reduced, and nitrogen pick-up is only 2ppm.
Embodiment 2
No. 45 steel of converter smelting of certain factory's nominal capacity for 120t.Molten steel in converter is measured using sublance before tapping
Sampling, it is 0.20% to measure endpoint molten steel carbon content, and in molten steel, nitrogen content is 14ppm.Directly entered using anthracite after tapping 1/3
Row pre-deoxidation, anthracite addition are ton steel 0.3kg, and 1/3～2/3 period ladle bottom blowing of tapping adopts strong mixing, BOTTOM ARGON BLOWING to supply
Gas intensity is 0.0025m3/ (min t steel), other tapping stages adopt less air supply intensity 0.0015m3/(min·t
Steel), tapping obtains molten steel oxygen activity for 60ppm in furnace rear Argon oxygen of standing firm after terminating, and determine after oxygen terminates, feeding aluminum steel ton steel
2m, controls BOTTOM ARGON BLOWING intensity for 0.0015m during line feeding3/ (min t steel), line feeding measures molten steel oxygen activity after terminating be 10ppm,
Nitrogen content is 17ppm, and tapping process deoxygenated alloy consumption is reduced, and nitrogen pick-up is only 2ppm.
Embodiment 3
Converter smelting P72LXB steel of certain factory's nominal capacity for 120t.Molten steel in converter is surveyed using sublance before tapping
Sample is measured, it is 0.25% to measure endpoint molten steel carbon content, nitrogen content is 12ppm in molten steel.Steel grade institute is directly added into after tapping 1/3
The alloy for needing and carburant, and adopt the strong mixing, BOTTOM ARGON BLOWING air supply intensity to be in 1/3～2/3 period ladle bottom blowing of tapping
0.003m3/ (min t steel), other tapping stages adopt less air supply intensity 0.0012m3/ (min t steel), tapping knot
Molten steel oxygen activity is obtained for 55ppm in furnace rear Argon oxygen of standing firm after beam, determine after oxygen terminates, feeding aluminum steel ton steel 3m, line feeding time control
BOTTOM ARGON BLOWING intensity processed is 0.0015m3/ (min t steel), line feeding measure molten steel oxygen activity for 9ppm after terminating, nitrogen content is
13ppm, tapping process deoxygenated alloy consumption are reduced, and nitrogen pick-up is only 1ppm.
Comparative example 1
Converter smelting 45 steel of certain factory's nominal capacity for 120t.Molten steel in converter is carried out surveying using sublance before tapping
Sample is measured, it is 0.10% to measure endpoint molten steel carbon content, nitrogen content is 16ppm in molten steel.After tapping directly by ferro-aluminum and other
Alloy adds ladle together, and wherein ferro-aluminum addition is ton steel 2.5kg, and measuring molten steel oxygen activity in furnace rear chain-wales after tapping is
9ppm, nitrogen content in liquid steel are 24ppm, tapping process nitrogen pick-up 6ppm.
Comparative example 2
Converter smelting 50 steel of certain factory's nominal capacity for 120t.Molten steel in converter is carried out surveying using sublance before tapping
Sample is measured, it is 0.20% to measure endpoint molten steel carbon content, nitrogen content is 15ppm in molten steel.After tapping directly by ferro-aluminum and other
Alloy adds ladle together, and wherein ferro-aluminum addition is ton steel 2kg, and measuring molten steel oxygen activity in furnace rear chain-wales after tapping is
8ppm, nitrogen content in liquid steel are 24ppm, tapping process nitrogen pick-up 9ppm.
Comparative example 3
Converter smelting P72LXB steel of certain factory's nominal capacity for 120t.Molten steel in converter is entered to advance using sublance before tapping
Row measurement sampling, it is 0.25% to measure endpoint molten steel carbon content, and in molten steel, nitrogen content is 15ppm.After tapping directly by ferro-aluminum and
Other alloys add ladle together, and wherein ferro-aluminum addition is ton steel 2kg, measures molten steel oxygen activity in furnace rear chain-wales after tapping
For 7ppm, nitrogen content in liquid steel is 23ppm, tapping process nitrogen pick-up 8ppm.
Claims (5)
1. the tapping deoxidization technique under the conditions of half steel highcasting speed, it is characterised in that：
As the weight/mass percentage composition ＜ 0.20% of 0.10%≤carbon in converter terminal molten steel, during tapping 1/3 according to 0.1～
The gauge of 0.3kg/ ton steel, adds carburant to carry out pre-deoxidation on molten steel；Tapping carries out determining oxygen in furnace rear Argon platform after terminating,
Ensure molten steel oxygen activity ＞ 50ppm, determine after oxygen terminates, according to the gauge of 2～3m/ ton steel, addition aluminum steel carries out thorough deoxidation；
When weight/mass percentage composition >=0.20% of carbon in converter terminal molten steel, not deoxidation of tapping, directly in furnace rear Argon platform
Carry out determining oxygen, aluminum steel deoxidation is added according to oxygen value is determined according to the gauge of 3～4m/ ton steel；
To steel ladle bottom argon blowing when above-mentioned tapping process and tapping end addition deoxidizer aluminum steel.
2. tapping deoxidization technique according to claim 1 under the conditions of half steel highcasting speed, it is characterised in that：The carburant is
At least one of the carburetting pig iron, electrode powder, petroleum coke powder, charcoal powder, anthracite, coke blacking.
3. tapping deoxidization technique according to claim 2 under the conditions of half steel highcasting speed, it is characterised in that：The carburant is
The anthracite of carbon content >=90%.
4. tapping deoxidization technique according to claim 1 under the conditions of half steel highcasting speed, it is characterised in that：Tapping 1/3～2/3
Period steel ladle bottom argon blowing air supply intensity is 0.002m3/ (min t steel)～0.003m3/ (min t steel)；Other tapping stages and
When tapping terminates to add aluminum steel, BOTTOM ARGON BLOWING air supply intensity is 0.001m3/ (min t steel)～0.0015m3/ (min t steel).
5. tapping deoxidization technique according to claim 1 under the conditions of half steel highcasting speed, it is characterised in that：The aluminum of the aluminum steel
Content >=90%, a diameter of 10mm.
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| CN106967863A (en) * | 2017-05-26 | 2017-07-21 | 攀钢集团攀枝花钢铁研究院有限公司 | Alundum (Al2O3) inclusion method in one kind reduction semi-steel making steel billet |
| CN107723577A (en) * | 2017-09-14 | 2018-02-23 | 首钢京唐钢铁联合有限责任公司 | A kind of semisteel smelting method |
| CN109880969A (en) * | 2019-04-04 | 2019-06-14 | 本钢板材股份有限公司 | A kind of deoxidation in steel making method in converter tapping process |
| CN112094987A (en) * | 2020-10-14 | 2020-12-18 | 马鞍山钢铁股份有限公司 | Method for controlling carbon content of molten steel |
| CN114959173B (en) * | 2022-05-26 | 2024-03-22 | 湖南华菱涟源钢铁有限公司 | Use method of coke powder carburant |
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| CN102051440A (en) * | 2009-11-10 | 2011-05-11 | 攀钢集团钢铁钒钛股份有限公司 | Molten steel deoxidizing and carbureting method and steelmaking method |
| CN102443672A (en) * | 2011-12-07 | 2012-05-09 | 鞍钢股份有限公司 | Method for controlling nitrogen increasing of converter tapping molten steel |
| CN102965468A (en) * | 2012-10-30 | 2013-03-13 | 鞍钢股份有限公司 | Addition method of ferrovanadium in converter steelmaking |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102051440A (en) * | 2009-11-10 | 2011-05-11 | 攀钢集团钢铁钒钛股份有限公司 | Molten steel deoxidizing and carbureting method and steelmaking method |
| CN102443672A (en) * | 2011-12-07 | 2012-05-09 | 鞍钢股份有限公司 | Method for controlling nitrogen increasing of converter tapping molten steel |
| CN102965468A (en) * | 2012-10-30 | 2013-03-13 | 鞍钢股份有限公司 | Addition method of ferrovanadium in converter steelmaking |
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