CN109457076A - A kind of control method of nitrogen content of molten steel - Google Patents
A kind of control method of nitrogen content of molten steel Download PDFInfo
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- CN109457076A CN109457076A CN201811236253.3A CN201811236253A CN109457076A CN 109457076 A CN109457076 A CN 109457076A CN 201811236253 A CN201811236253 A CN 201811236253A CN 109457076 A CN109457076 A CN 109457076A
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- molten steel
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 152
- 238000000034 method Methods 0.000 title claims abstract description 78
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 76
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 72
- 239000010959 steel Substances 0.000 title claims abstract description 72
- 230000008569 process Effects 0.000 claims abstract description 56
- 238000007670 refining Methods 0.000 claims abstract description 55
- 238000003723 Smelting Methods 0.000 claims abstract description 41
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000009749 continuous casting Methods 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 17
- 229910052742 iron Inorganic materials 0.000 claims abstract description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 52
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 42
- 239000001301 oxygen Substances 0.000 claims description 42
- 229910052760 oxygen Inorganic materials 0.000 claims description 42
- 229910052786 argon Inorganic materials 0.000 claims description 26
- 230000005540 biological transmission Effects 0.000 claims description 21
- 239000002893 slag Substances 0.000 claims description 15
- 238000010079 rubber tapping Methods 0.000 claims description 14
- 229910000805 Pig iron Inorganic materials 0.000 claims description 11
- 238000007664 blowing Methods 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims description 7
- 238000010926 purge Methods 0.000 claims description 7
- 239000004411 aluminium Substances 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 4
- 238000009491 slugging Methods 0.000 claims description 4
- 239000005997 Calcium carbide Substances 0.000 claims description 3
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 description 10
- 238000009628 steelmaking Methods 0.000 description 5
- 230000002411 adverse Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000003483 aging Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000005262 decarbonization Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- -1 manganeisen Chemical compound 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/32—Blowing from above
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention belongs to steel and iron manufacturing technical field, the content of nitrogen is controlled in --- LF refining --- the sheet billet continuous casting process that discloses a kind of control method of nitrogen content of molten steel, comprising: converter smelting respectively；The present invention controls the content of nitrogen in molten steel, and guarantee the stability of nitrogen content by the denitrogenation amount or control nitrogen quantity of comprehensively control converter smelting, LF refining and sheet billet continuous casting process.By improving converter denitrification ability, reducing LF nitrogen increased amount, stability contorting sheet billet continuous casting process, Metal in Tundish nitrogen content is to meet steel grade performance requirement, and production cost is effectively reduced within 60ppm when control molten steel unit consumption is 800kg/t.
Description
Technical field
The invention belongs to steel and iron manufacturing technical fields, and in particular to a kind of control method of nitrogen content of molten steel.
Background technique
In recent years, many steel mills are to reduce production cost, when steel scrap price is lower than molten iron price in the market, using increase
Adding amount of scrap steel in steelmaking process reduces cost, i.e. reduction hot metal single consumption.As hot metal single consumption reduces, in steelmaking process
Nitrogen reduced capability is controlled, nitrogen content increases.For most of steel grades, nitrogen is harmful element, and the increase of nitrogen in steel content can reduce
The impact flexibility and plasticity of steel, and lead to age-hardening；Nitrogen can also increase substantially the ductile-brittle transition temperature of steel, generate steel low
Warm temper brittleness, nitride also result in the hot-short of steel.
Therefore, how to control nitrogen content of molten steel under the conditions of low hot metal single consumption becomes the task of top priority.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of control method of nitrogen content of molten steel, turned by comprehensively control
The nitrogen increased amount and sheet billet continuous casting nitrogen increased amount of denitrogenation amount, LF refining that furnace is smelted, control nitrogen content of molten steel with this.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of control method of nitrogen content of molten steel, converter smelting
The content of nitrogen is controlled in refining --- LF refining --- sheet billet continuous casting process respectively；Specifically includes the following steps:
The pig iron, molten iron and steel scrap are added in converter, converter smelting, oxygen rifle flow and rifle are adjusted in converter smelting process
Position, the nitrogen content of molten steel control after controlling converter tapping is within 30ppm；
After converter smelting, LF refining adjusts power transmission number and power transmission flow in LF refining process, controls LF refining process
Middle molten steel nitrogen increased amount is within 20ppm；
After LF refining, sheet billet continuous casting, in sheet billet continuous casting process, adjusting, which is opened, pours tundish argon gas purge time, Yi Jichang
Mouth of a river argon flow, controlling nitrogen increased amount in slab continuous casting working procedure is within 5ppm；
When realizing that hot metal single consumption is 800kg/t, Metal in Tundish nitrogen content is within 60ppm.
Further, oxygen rifle flow and rifle position are adjusted in converter smelting process, oxygen rifle oxygen flow is 46000m3/h
~50000m3/h；When oxygen blast progress is 0~90%, oxygen lance position is 1800~1900mm, and after oxygen lance position determines, rifle position is protected
It holds constant；When oxygen blast progress is 90%~100%, oxygen lance position is 1650~1750mm, and after oxygen lance position determines, rifle position is kept
It is constant；It is 50S or more that terminal, which presses the rifle time,.
Further, in converter smelting process, control converter smelting process endpoint carbon content be 0.035%~
0.06%；The outlet temperature for controlling converter smelting is 1580 DEG C or more.
Further, in converter smelting process, be added before blowing 500~1000kg of ferrosilicon or silicon-carbon ball 600~
1500kg；Boiling tapping, tapping flow are 100m3Lime slugging is added in/h, and silicomangan, Antaciron, manganese iron is added and closes
Gold, argon station soft blow flow are 30m3/h。
Further, in LF refining process, use 1 grade of electric current, arcing time for 1min or more；Control power transmission number≤3
It is secondary；Silicomangan, Antaciron, manganeisen, ferrotianium is added in power transmission flow≤300L/min, slag making flow≤800L/min
Alloy and aluminum shot, Calcium treatment bottom blowing flow are 100~400L/min, LF refining soft blow flow≤180L/min.
Further, in LF refining process, the quality percentage of aluminium is added in power transmission when LF refining temperature is 1520~1540 DEG C
100~200kg of slag adjusting agent, the 40~60kg of calcium carbide that content is 20%；CaO and Al in clinker2O3Mass ratio be 1.5~2.0.
Further, in LF refining process, dedusting fan absorbing duct valve opening is 25~40%.
Further, in sheet billet continuous casting process, opening and pouring tundish argon gas purge time is 5min or more, opens and pours and be poured
The SiO that Cheng Tianjia is 80%~90% containing mass percentage2Acid coverture；Long nozzle argon flow is adjusted to 150L/
min。
Further, in converter be added the pig iron be 5~10 tons/furnace, molten iron be 172~174 tons/furnace, steel scrap be 52~
57 tons/furnace, total 235 tons/furnace of charge weight.
Compared with the prior art, the present invention has the following beneficial effects: the value of hot metal single consumption is lower, production cost is lower,
But the ability of converter denitrogenation is weaker, and embodiment of the present invention passes through comprehensively control converter smelting when hot metal single consumption is 800kg/t
Denitrogenation amount, LF refining nitrogen increased amount and sheet billet continuous casting nitrogen increased amount, control Metal in Tundish nitrogen content be 60ppm within, and guarantee
The stability of nitrogen content in Metal in Tundish, meets steel grade performance requirement, and production cost is effectively reduced.
Specific embodiment
In order to which technical problems, technical solutions and advantages to be solved are more clearly understood, tie below
Embodiment is closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to solve
The present invention is released, is not intended to limit the present invention.
Now to a kind of control method of nitrogen content of molten steel provided by the invention, it is illustrated.
In embodiment of the present invention, a kind of control method of nitrogen content of molten steel: converter smelting is provided --- LF essence
Refining --- the content of nitrogen is controlled in sheet billet continuous casting process respectively；Specifically includes the following steps:
S01, the pig iron, molten iron and steel scrap are added in converter, converter smelting adjusts oxygen rifle flow in converter smelting process
And rifle position, the nitrogen content of molten steel control after controlling converter tapping is within 30ppm；
After S02, converter smelting, LF refining adjusts power transmission number and power transmission flow in LF refining process, controls LF refining
Molten steel nitrogen increased amount is within 20ppm in process；
After S03, LF refining, sheet billet continuous casting, in sheet billet continuous casting process, adjusting, which is opened, pours tundish argon gas purge time, with
And long nozzle argon flow, controlling nitrogen increased amount in slab continuous casting working procedure is within 5ppm；
When S04, realization hot metal single consumption are 800kg/t, Metal in Tundish nitrogen content is within 60ppm.
The value of hot metal single consumption is lower, and production cost is lower, but the ability of converter denitrogenation is weaker, and embodiment of the present invention is in iron
When water unit consumption is 800kg/t, by comprehensively control converter smelting denitrogenation amount, LF refining nitrogen increased amount and sheet billet continuous casting nitrogen increased amount,
Control Metal in Tundish nitrogen content be 60ppm within, and guarantee Metal in Tundish in nitrogen content stability, meet steel grade
It can require, and production cost is effectively reduced.
Specifically, converter smelting process, is added ferrosilicon before blowing or silicon-carbon ball carries out concurrent heating in above-mentioned steps S01, pass through
Oxygen rifle flow and rifle position are adjusted, it is dry that raising decarbonization rate prevents process from returning, and in converter tapping process, lime slugging is added, adjusts
Argon station soft blow flow；
The content and outlet temperature for controlling converter smelting process aim carbon, prevent serious nitrogen pick-up during LF refining, also prevent
Only generate the adverse effects such as slag crust.
As a specific embodiment of the invention, oxygen rifle flow and rifle position, oxygen rifle oxygen stream are adjusted in converter smelting process
Amount is 46000m3/ h~50000m3/h；When oxygen blast progress is 0~90%, oxygen lance position is 1800~1900mm, oxygen lance position
After determination, rifle position is remained unchanged；When oxygen blast progress is 90%~100%, oxygen lance position is 1650~1750mm, and oxygen lance position is true
After fixed, rifle position is remained unchanged；It is 50S or more that terminal, which presses the rifle time,.
In the embodiment of the present invention, with oxygen blown progress, reaction between carbon and oxygen enhances in molten steel, oxidation of coal in molten bath, generates big
CO bubble is measured, CO bubble reduces nitrogen partial pressure, while the slag phase and CO bubble that emulsify in converter steelmaking process are that denitrogenation is anti-jointly
Sufficiently large reaction interface product should be provided, the nitrogen in molten steel is removed, converter nitric efficiency is improved, prevents from returning dry.Oxygen blast
When progress is 0~90%, permanent rifle position operation is kept；Stablize denitrification rates.When oxygen blast progress is 90%~100%, permanent rifle is kept
Bit manipulation；Stablize denitrification rates.
As the preferred embodiment of the present invention, oxygen rifle oxygen flow is 48000m3/h；When oxygen blast progress is 0~90%, oxygen rifle
Rifle position is 1850mm；When oxygen blast progress is 90%~100%, oxygen lance position 1700mm；It is 50S~70S that terminal, which presses the rifle time,.
As an of the invention specific embodiment, in converter smelting process, the endpoint carbon content of control converter smelting process is
0.035%~0.06%；The outlet temperature for controlling converter smelting is 1580 DEG C or more.
In the embodiment of the present invention, improves the denitrification effect in converter smelting process, prevent in converter smelting later period molten steel
Carbon blowing to it is extremely low when, CO partial pressure drastically reduce, fire door pressure difference reduce, prevent air be involved in and caused by molten steel inhale nitrogen.
In the embodiment of the present invention, the outlet temperature for controlling converter smelting is 1580 DEG C or more, in subsequent LF refining process
In, LF inlet temperature guarantees to prevent serious nitrogen pick-up during LF refining at 1520 DEG C or more, is also prevented from and generates slag crust, changes
Slag effect is poor, and slag fluidity is poor, the adverse effect such as submerged arc effect difference.
As the preferred embodiment of the present invention, the outlet temperature for controlling converter smelting is 1580 DEG C~1640 DEG C.
As an of the invention specific embodiment, in converter smelting process, 500~1000kg of ferrosilicon or silicon is added before blowing
600~1500kg of carbon ball；Boiling tapping, tapping flow are 100m3Lime slugging is added in/h, silicomangan is added, ferrosilicon closes
Gold, manganeisen, argon station soft blow flow are 30m3/h.The mass percentage of silicon is the quality of 65%, carbon in the silicon-carbon ball
Percentage composition is 17%.
In the embodiment of the present invention, compared to the coke that phase homogenous quantities are added, by the way that the ferrosilicon of phase homogenous quantities or identical is added
The silicon-carbon ball of quality carries out concurrent heating temperature raising, and concurrent heating effect is more preferable, and will not generate increasing sulphur.Ferrosilicon or silicon-carbon ball are as temperature raising
Ferrosilicon or silicon-carbon ball is added in converter steelmaking process in agent, guarantees that outlet temperature is 1580 DEG C or more, increases converter smelting
Coolant-temperature gage is made steel, molten steel boiling tapping, the oxygen content of molten steel is high, and the mass tranfer coefficient that nitrogen dissolves in molten steel is small, molten steel nitrogen content
It reduces.And converter smelting endpoint is not re-blow, over-blowing；Argon station soft blow flow is 30m3/ h prevents the molten steel of converter smelting from turning over greatly, has
Effect reduces the nitrogen increased amount of converter terminal to argon station, stablizes argon station nitrogen content；Nitrogen content of molten steel after control converter tapping, which controls, is
Within 30ppm.
Specifically, in LF refining process, using 1 grade of electric current, arcing time for 1min or more in above-mentioned steps S02；Control
Power transmission number≤3 time；Silicomangan, Antaciron, manganese is added in power transmission flow≤300L/min, slag making flow≤800L/min
Ferroalloy, ferro-titanium, aluminum shot, Calcium treatment bottom blowing flow are 100~400L/min, LF refining soft blow flow≤180L/min.
It is described that use 1 grade of starting the arc be specially secondary voltage for 300~500v, the electric current 20000A starting the arc.
In LF refining process, LF refining temperature is 1520~1540 DEG C of power transmissions, and the mass percentage that aluminium is added is 20%
100~200kg of slag adjusting agent, 40~60kg of calcium carbide；CaO and Al in clinker2O3Mass ratio be 1.5~2.0.
In the embodiment of the present invention, power transmission number and power transmission electric current in LF refining process are controlled, it is low early period that LF refining can be reduced
Warm power transmission nitrogen increased amount.
To improve LF refining slag mobility and submerged arc effect, CaO and Al in clinker2O3Mass ratio be 1.5~2.0；It is formed
Thickness is greater than the LF refining slag blanket of 100mm；It is powered on stone and promotes top slag foaming, power transmission nitrogen increased amount can be effectively reduced.
Converter tapping is not added aluminium, and in LF refining process, LF refining temperature is 1520~1540 DEG C of power transmissions, and the quality of aluminium is added
The slag adjusting agent that percentage composition is 20%, into LF refining process, nitrogen pick-up 8ppm, argon station to LF refining go out argon station after first time power transmission
Stand average nitrogen pick-up 17ppm, and controlling molten steel nitrogen increased amount in LF refining process is within 20ppm.
As the preferred embodiment of the present invention, early period, mid-term, the later period of LF refining process adjust Calcium treatment bottom blowing stream respectively
Amount is 100~400L/min, 200~300L/min, 300~400L/min.
Liquid steel level rolls when converter tapping, and molten steel bare area is big, and LF refining turns argon wind drift amount down early period, mitigates molten steel
Liquid level rolling situation, reduces molten steel bare area, reduces nitrogen pick-up chance in molten steel；In LF refining mid-term and later period, successively adjust
Argon wind drift amount refines the argon wind drift amount of LF refining process, reduces nitrogen pick-up chance in molten steel, controls the nitrogen pick-up in LF refining process
Amount.
As the preferred embodiment of the present invention, in LF refining process, dedusting fan absorbing duct valve opening is 25~40%.
In the embodiment of the present invention, guarantee micro-positive pressure in LF refining process, reduces high-temperature electric arc and ionize the nitrogen in surrounding air, into one
Step reduces molten steel nitrogen increased amount in LF refining process.
Specifically, in sheet billet continuous casting process, opening and pouring tundish argon gas purge time is 5min or more in above-mentioned steps S03,
Open pour and casting process addition containing mass percentage be 80%~90% SiO2Acid coverture；Adjust long nozzle argon gas
Flow is to 150L/min.
In the embodiment of the present invention, opening and pouring tundish argon gas purge time is 5min or more, and reduction, which is opened, pours nitrogen increased amount；Quality hundred
Dividing content is 80%~90% SiO2Acid coverture acidity coverture, can prevent middle cinder inclusion from crusting；And increase long nozzle
Argon flow is to 150L/min；Controlling nitrogen increased amount in slab continuous casting working procedure is within 5ppm.
In the various embodiments described above of the present invention, in converter be added the pig iron be 5~10 tons/furnace, molten iron be 172~174 tons/
Furnace, steel scrap are 52~57 tons/furnace, total 235 tons/furnace of charge weight.The adding amount of scrap steel is 52~57 tons/furnace, and additional amount is big,
Hot metal single consumption is low；And 5~10 tons/furnace of the pig iron is added, phosphorization in converter steelmaking process, carburetting are prevented, prevents from producing the performance of steel
Raw adverse effect；In the embodiment of the present invention, the addition proportion of the pig iron, molten iron, steel scrap, it is ensured that prevent during converter smelting
While anti-avulsion nitrogen reduced capability, the adverse effect of phosphorization, carburetting is avoided.As specific embodiments of the present invention, in converter
The addition pig iron is 8 tons/furnace, and molten iron is 173 tons/furnace, and steel scrap is 54 tons/furnace, total 235 tons/furnace of charge weight.
As another specific embodiment of the invention, it is 6 tons/furnace that the pig iron is added in converter, and molten iron is 174 tons/furnace, is given up
Steel is 55 tons/furnace, total 235 tons/furnace of charge weight.
As still another embodiment of the invention, it is 7 tons/furnace that the pig iron is added in converter, and molten iron is 172 tons/furnace, is given up
Steel is 56 tons/furnace, total 235 tons/furnace of charge weight.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (9)
1. a kind of control method of nitrogen content of molten steel, which is characterized in that converter smelting --- LF refining --- sheet billet continuous casting process
The middle content for controlling nitrogen respectively；Specifically includes the following steps:
The pig iron, molten iron and steel scrap are added in converter, converter smelting, oxygen rifle flow and rifle position are adjusted in converter smelting process,
Nitrogen content of molten steel control after controlling converter tapping is within 30ppm；
After converter smelting, LF refining adjusts power transmission number and power transmission flow in LF refining process, controls steel in LF refining process
Water nitrogen increased amount is within 20ppm；
After LF refining, sheet billet continuous casting, in sheet billet continuous casting process, adjusting, which is opened, pours tundish argon gas purge time and long nozzle
Argon flow, controlling nitrogen increased amount in slab continuous casting working procedure is within 5ppm；When realizing that hot metal single consumption is 800kg/t, intermediate Baogang
Water nitrogen content is within 60ppm.
2. the control method of nitrogen content of molten steel according to claim 1, which is characterized in that adjusted in converter smelting process
Oxygen rifle flow and rifle position, oxygen rifle oxygen flow are 46000m3/ h~50000m3/h；When oxygen blast progress is 0~90%, oxygen lance position
For 1800~1900mm, after oxygen lance position determines, rifle position is remained unchanged；When oxygen blast progress is 90%~100%, oxygen lance position is
1650~1750mm, after oxygen lance position determines, rifle position is remained unchanged；It is 50S or more that terminal, which presses the rifle time,.
3. the control method of nitrogen content of molten steel according to claim 1 characterized by comprising in converter smelting process,
The endpoint carbon content for controlling converter smelting process is 0.035%~0.06%；The outlet temperature for controlling converter smelting is 1580 DEG C
More than.
4. the control method of nitrogen content of molten steel according to claim 1, which is characterized in that in converter smelting process, blowing
600~1500kg of 500~1000kg of preceding addition ferrosilicon or silicon-carbon ball；Boiling tapping, tapping flow are 100m3Stone is added in/h
Grey slugging, is added silicomangan, Antaciron, manganeisen, and argon station soft blow flow is 30m3/h。
5. the control method of nitrogen content of molten steel according to claim 1, which is characterized in that in LF refining process, using 1 grade
Electric current, arcing time are 1min or more；Control power transmission number≤3 time；Power transmission flow≤300L/min, slag making flow≤800L/
Min, is added silicomangan, Antaciron, manganeisen, ferro-titanium and aluminum shot, and Calcium treatment bottom blowing flow is 100~400L/
Min, LF refining soft blow flow≤180L/min.
6. the control method of nitrogen content of molten steel according to claim 1, which is characterized in that in LF refining process, LF refining
100~200kg of slag adjusting agent that the mass percentage of aluminium is 20%, calcium carbide 40 is added in power transmission when temperature is 1520~1540 DEG C
~60kg；CaO and Al in clinker2O3Mass ratio be 1.5~2.0.
7. the control method of nitrogen content of molten steel according to claim 1, which is characterized in that in LF refining process, dedusting wind
Machine absorbing duct valve opening is 25~40%.
8. the control method of nitrogen content of molten steel described in any one claim according to claim 1, which is characterized in that slab connects
In foundry work sequence, opening and pouring tundish argon gas purge time is 5min or more, opens and pours and casting process addition containing mass percentage is
80%~90% SiO2Acid coverture；Long nozzle argon flow is adjusted to 150L/min.
9. the control method of nitrogen content of molten steel described in any claim according to claim 1~8, which is characterized in that turning
In furnace be added the pig iron be 5~10 tons/furnace, molten iron be 172~174 tons/furnace, steel scrap be 52~57 tons/furnace, 235 tons of total charge weight/
Furnace.
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| CN111313487A (en) * | 2020-03-24 | 2020-06-19 | 芜湖新兴铸管有限责任公司 | Power transmission method for ladle refining furnace |
| CN114635006A (en) * | 2022-03-31 | 2022-06-17 | 宝武集团鄂城钢铁有限公司 | Smelting method for reducing nitrogen increase of molten steel in converter process |
| CN114807515A (en) * | 2022-05-05 | 2022-07-29 | 湖南华菱涟源钢铁有限公司 | Method for controlling nitrogen increase of molten steel in BOF-LF-CC process |
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| CN114807515A (en) * | 2022-05-05 | 2022-07-29 | 湖南华菱涟源钢铁有限公司 | Method for controlling nitrogen increase of molten steel in BOF-LF-CC process |
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