CN108085577B - A kind of smelting process improving ton steel scrap ratio - Google Patents
A kind of smelting process improving ton steel scrap ratio Download PDFInfo
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- CN108085577B CN108085577B CN201711117757.9A CN201711117757A CN108085577B CN 108085577 B CN108085577 B CN 108085577B CN 201711117757 A CN201711117757 A CN 201711117757A CN 108085577 B CN108085577 B CN 108085577B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 250
- 239000010959 steel Substances 0.000 title claims abstract description 250
- 238000000034 method Methods 0.000 title claims abstract description 127
- 238000003723 Smelting Methods 0.000 title claims abstract description 47
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 182
- 229910052742 iron Inorganic materials 0.000 claims abstract description 91
- 238000010079 rubber tapping Methods 0.000 claims abstract description 45
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000002893 slag Substances 0.000 claims abstract description 40
- 229910052751 metal Inorganic materials 0.000 claims abstract description 39
- 239000002184 metal Substances 0.000 claims abstract description 38
- 238000007670 refining Methods 0.000 claims abstract description 38
- 238000007664 blowing Methods 0.000 claims abstract description 30
- 229910052786 argon Inorganic materials 0.000 claims abstract description 21
- 238000009628 steelmaking Methods 0.000 claims abstract description 16
- 238000009792 diffusion process Methods 0.000 claims abstract description 8
- 238000005275 alloying Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 239000003245 coal Substances 0.000 claims abstract description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 30
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 29
- 229910052760 oxygen Inorganic materials 0.000 claims description 29
- 239000001301 oxygen Substances 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 claims description 21
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- 230000005540 biological transmission Effects 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 12
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 10
- 239000010436 fluorite Substances 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 8
- 238000005457 optimization Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 3
- 206010037660 Pyrexia Diseases 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 238000003359 percent control normalization Methods 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 abstract description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 24
- 230000008901 benefit Effects 0.000 abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 description 20
- 238000004519 manufacturing process Methods 0.000 description 19
- 229910000976 Electrical steel Inorganic materials 0.000 description 18
- 238000012360 testing method Methods 0.000 description 14
- 239000004411 aluminium Substances 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 10
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 7
- 235000011941 Tilia x europaea Nutrition 0.000 description 7
- 239000004571 lime Substances 0.000 description 7
- 230000033764 rhythmic process Effects 0.000 description 7
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- 239000004615 ingredient Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 241001417490 Sillaginidae Species 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- -1 aluminium manganese iron Chemical compound 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
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- 238000002844 melting Methods 0.000 description 1
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- 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
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Abstract
A kind of smelting process improving ton steel scrap ratio, it by optimize steel scrap coal addition position and mode, the cooperation light treatment process of LF furnace refining station carries out mending temperature, alloying, de- S and goes to be mingled with operation to molten steel, concrete operation step are as follows: steel scrap is added in a, blast furnace ironmaking process in blast furnace iron outlet groove；B, steel scrap is added to the hot metal flow impact zone of ladle during mixed iron blast tapping in mixed iron blast process；C, steel scrap is added into Converter for pneumatic steelmaking process；D, steel scrap is added in furnace after-blow argon station ladle in Argon process after furnace；E, the process cycle control of LF refining process, LF refining furnace is being less than or equal to the pouring molten steel period, and the weak stirring of refining process argon bottom-blowing, in 1.5~1.7 ranges, diffusion deoxidizer additional amount is 0.5~1.0kg/ tons of steel for refining basicity of slag control.The present invention improves product quality, reduces a ton steel carbon emission, has achieved the purpose that increase enterprise management efficiency, social benefit.
Description
Technical field
The present invention relates to a kind of iron and steel smelting process, especially a kind of smelting process for improving ton steel scrap ratio belongs to refining
Steel technical field.
Background technique
With the fast development of Steel Industrial nearly more than ten years, domestic steel cumulant is substantially improved, social steel scrap by
Year increases, and scrap resources yield can reach 200,000,000 tons, and this trend will be kept for a long time.Especially from the beginning of this year, state key
Strike intermediate frequency " bar steel " is produced and is eliminated the backward production facilities in violation of rules and regulations, and more than one hundred million tons of ground bar steel production capacities exit, and supply exceed demand for scrap resources,
Cheap, steel scrap is obvious compared with molten iron price advantage.Therefore, steel scrap usage amount is increased in long process steelmaking process, can not only dropped
Low-carbon emission, and be also of great significance to reducing production cost, improving the performance of enterprises.
The bottleneck for improving ton steel scrap ratio is the compensation of furnace system heat, and metallargist is improving converter scrap ratio,
Done a large amount of work in terms of reducing pneumatic steelmaking molten steel consumption, content include: improve converter enter furnace molten steel quality (high Si%,
Few slag reduces temperature damage), increase steel scrap heavy burder ratio, scrap steel preheating (in iron packet/converter/furnace outside), converter with addition of metal system or carbon system
Heating element concurrent heating, raising that scrap ratio is realized using measures such as porous oxygen rifle and Oxygen Lance With Secondary Combustions, molten steel consumption
It reduces.But there are still many shortcomings, molten iron high Si (silicon) contents (0.40% or more) to mean high coke ratio for the studies above,
It is not met with carbon emission is reduced；Increase steel scrap heavy burder ratio, steel scrap is not easy to melt, and smelting operation is difficult；Using scrap steel preheating (iron packet
In interior/converter/furnace outside) mode when, scrap steel preheating such as is carried out in iron packet, organization of production is complicated, the scrap heating need in converter
It to be equipped with coal powder injection gas or heavy oil burner system and lancing system simultaneously, device structure is complicated, can not achieve the standby rifle of circulation, inconvenient
In production, in steel scrap furnace external heat, the temperature damage during having bad luck, which controls and has bad luck equipment record, to be needed to optimize, while steel scrap
Dioxin harmful substance can be generated in heating process, pollute environment；Converter can reduce steel scrap with addition of the hot element concurrent heating of metal system
Contributrion margin also results in quantity of slag increase, beneficial metallic elements recovery rate reduces；Use the heating element concurrent heating of carbon system, heat benefit
It is low with rate while will increase the sulfur content in molten steel, pollute molten steel；Using porous oxygen rifle, Oxygen Lance With Secondary Combustion and multifunctional spraying
Rifle, it is more serious to lining wear in smelting process, it is be easy to cause splash etc., while multifunction spray gun, Oxygen Lance With Secondary Combustion, it can not
The problems such as splashing slag needs individually to splash slag for rifle, and coal gas index error is unfavorable for coal-gas recovering.Ton steel scrap ratio is improved, molten iron is reduced and disappears
Consumption reduces the work that steel making working procedure ton carbon emission is a system, but the studies above rests essentially within converter smelting link, does not have
Relate to other processes or link.
Manufacturing cost is combined to improve product quality, the low carbon low silicon steel grade of iron and steel enterprise's production at present mostly uses
The outer processing mode of the furnace of " extending argon blowing time after furnace " or " tapping process wash heat+ladle top slag modification+Argon ", to improve material
Degree of purity.But the temperature loss in the outer treatment process of above-mentioned furnace is larger, and converter smelting endpoint need to increase substantially tapping temperature,
So that the smelting mode of high scrap ratio is restricted；After tapping temperature improves simultaneously, molten steel free oxygen content is high, and deoxidation products is raw
More at measuring, inclusion removal pressure is big, once rhythm of production fluctuates, purity of steel is severely impacted；Another tapping temperature
Degree is unfavorable for converter and takes off P (phosphorus) after improving, and de- S (sulphur) ability of the outer processing mode of above-mentioned furnace is poor, for the percentage for guaranteeing P, S
Content meets finished product control and requires, and needs to improve into furnace molten steel quality, leads to molten iron cost height.
It is current metallargist's urgent need to resolve in conclusion finding a kind of smelting process for improving ton steel scrap ratio
Problem.
Summary of the invention
The present invention provides a kind of smelting process for improving ton steel scrap ratio, it is intended under the premise of guaranteeing production direct motion, improve
Converter enters furnace scrap ratio, reduces the requirement into furnace molten steel quality, Improving The Quality of Products, reduces ton steel carbon emission, reaches increase enterprise
The purpose of industry effectiveness of operation, social benefit.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of smelting process improving ton steel scrap ratio, matches long course steelmaking technology process, passes through adding for optimization steel scrap
Entering position and mode, the cooperation light treatment process of LF furnace refining station carries out mending temperature, alloying, de- S and goes to be mingled with operation to molten steel,
To improve the additional amount of steel scrap ton steel, concrete operation step are as follows:
A, blast furnace ironmaking process, using conveyor belt with steel scrap is added in hot metal flow trough during blast furnace casting,
Adding amount of scrap steel is 15-20kg/t iron, and molten iron temperature control is within the scope of 1450~1510 DEG C in blast-melted ditch；
B, mixed iron blast process, melten iron in hot-metal mixer temperature are controlled at 1320 DEG C or more, during mixed iron blast tapping, by upper
Expect that steel scrap is added to the hot metal flow impact zone of ladle in belt, adding amount of scrap steel is 20~25kg/t iron；
C, steel scrap is added into Converter by steel scrap bucket for pneumatic steelmaking process, and adding amount of scrap steel is 350~370kg/t
Iron, tapping temperature control within the scope of 1570~1590 DEG C；
D, steel scrap, adding amount of scrap steel 12 is added in furnace after-blow argon station ladle using scrap steel trough in Argon process after furnace
~18kg/t steel, adds after steel scrap that liquid steel temperature control is being higher than 15 DEG C of liquidus curve or more in ladle；
E, LF refining process, less than or equal to the pouring molten steel period, refining process is adopted for the process cycle control of LF refining furnace
With the weak agitating mode of argon bottom-blowing, make that the top of the slag is wriggled and molten steel is not exposed, refining basicity of slag control is expanded in 1.5~1.7 ranges
Dissipating deoxidier additional amount is 0.5~1.0kg/t steel.
The smelting process of above-mentioned raising ton steel scrap ratio, in the step a, the steel scrap being added in blast furnace iron outlet groove is light
Thin material or Mechanical Crushing material, maximum outer dimension≤100mm.
The smelting process of above-mentioned raising ton steel scrap ratio, in the step a, Si content is controlled in blast-melted ditch molten iron
0.25% or more, P content is controlled within 0.15%, and S content controls within 0.05%.
The smelting process of above-mentioned raising ton steel scrap ratio, in the step b and step d, the hot metal flow of ladle is impacted
The steel scrap being added in area and furnace after-blow argon station ladle is frivolous broken material, maximum outer dimension≤50mm.
The smelting process of above-mentioned raising ton steel scrap ratio, in the step b, the control of Si content exists in mixed iron blast molten iron discharging
0.25% or more, P content controls within 0.15%, and S content controls within 0.05%.
The smelting process of above-mentioned raising ton steel scrap ratio, in the step c, the steel scrap type being added in Converter is machine
Tool broken material or light-duty steel scrap, maximum outer dimension≤200mm.
The smelting process of above-mentioned raising ton steel scrap ratio, in the step c, using low rifle position operation mode, rifle position control
System reduces 100-200cm compared with traditional handicraft, and smelting process oxygen rifle pressure is controlled in 1.0Mpa or more, whole oxygen bottom blowing flow control
System is in 400m3/h or more.
The smelting process of above-mentioned raising ton steel scrap ratio, in the step c, P content≤0.025% of tapping, when tapping
Between control within 4 minutes, tapping process be only added high alumina class fever contribution amount big deoxidation material carry out deoxidation, ladle bottom blowing
Do not open gas.
The smelting process of above-mentioned raising ton steel scrap ratio, in the step e, LF refining process uses remaining slag operation, stays
In 12kg/t steel -18kg/t steel, fluorite is added in the top of the slag for quantity of slag control, and fluorite additional amount is controlled in 0.35-0.45kg/t steel；It uses
High tap position heated by electrodes, electrode heating rate control the sample detection after 5.0 DEG C/min or more, power transmission 8 minutes and adjust chemistry
Ingredient meets after control requires in chemical component, temperature and comes out of the stove.
The present invention is after adopting the above technical scheme, achieve following technological progress effect:
The present invention adds the mode of steel scrap to improve ton steel scrap ratio using multiple spot, overcomes the existing raising ton steel scrap ratio of industry
The shortcoming of technology, the process route production low carbon low silicon steel grade that cooperation LF furnace is gently handled, solves conventionally produced low
Carbon low-silicon steel kind cannot achieve the bottleneck of high scrap ratio, improves Molten Steel Cleanliness, improves product quality, simultaneously because tapping
Temperature reduces, and relaxes the requirement to P content in molten iron, it can be ensured that sinter cost optimization, it is powerful using LF refining furnace
De- S ability, relaxes the control requirement of S content in molten iron, is conducive to blast furnace and keeps the long-term direct motion of stable furnace condition, reduces molten iron
Cost, another refining procedure carry out alloying, and the absorptivity of alloying element can be improved, and drop low alloy-consumption, final to realize enterprise's warp
The double promotions for the benefit, social benefit of helping.The experimental results showed that low using the low-carbon of the present invention based on high ton steel scrap ratio
Silicon steel kind smelting process, ton steel scrap ratio can reach 30%, enter that furnace molten iron S% content can be loosened within 0.05%, P% contains
Amount can be loosened within 0.15% and molten steel total oxygen content stability contorting is within 30ppm.
Specific embodiment
Below with reference to comparative example and specific embodiment, the invention will be further described.
Comparative example one is the smelting process of traditional low carbon low silicon steel grade cold rolling mill coil (Q195) molten steel, behaviour
Make step are as follows:
A, blast furnace ironmaking process, blast-melted ingredient: Si content is 0.30%, S content is 0.03%, P content is
0.13%；
B, mixed iron blast process, 1320 DEG C of molten iron temperature, hot metal composition Si content is that 0.30%, S content is that 0.025%, P contains
Amount is 0.12%.
C, pneumatic steelmaking process, converter molten iron charge weight 73.5t, steel scrap charge weight 202kg/t iron, tap 83t smelt
The control of process oxygen rifle pressure is controlled in 0.8Mpa, rifle position in 800cm, and whole Bottom Blowing Flow Rate Control is in 400m3/ h, tapping temperature
1675 DEG C, tap P content 0.023%, S content 0.028%；20kg aluminium block, Si-Al-Ca-Ba double deoxidizer is added in tapping process
400kg low carbon low silicon wash heat material, tapping process is added in 140kg, 40kg ferrosilicon, 440kg silicomangan after alloy material adds
The stirring of ladle bottom blowing atm number, taps the time 20 seconds 3 minutes.
D, Argon process after furnace, is added 80kg aluminium powder to ladle surface and is diffused deoxidation by 1600 DEG C of molten steel inlet temperature,
Soft blow 14 minutes, 1585 DEG C of upper steel temperature.
One smelting process steel scrap of comparative example consumes 179kg/ tons of steel, scrap ratio 17%.
It is tested through national steel products Quality Supervision and Inspection Center, the low carbon low silicon steel grade cold rolling heat of comparative example production
Test result is as follows shown in table for the material composition and degree of purity for rolling ribbon steel (Q195) product.
Comparative example two is the smelting process of traditional low carbon low silicon steel grade welding steel gren rod (H08A) molten steel, behaviour
Make step are as follows:
A, blast furnace ironmaking process, hot metal composition Si content is 0.28%, S content is 0.02%, P content 0.12%.
B, mixed iron blast process, 1325 DEG C of molten iron temperature, hot metal composition Si content is that 0.30%, S content is that 0.02%, P contains
Amount is 0.115%.
C, pneumatic steelmaking process, converter molten iron charge weight 73.5t, steel scrap charge weight 203kg/t iron, tap 83t.It smelts
The control of process oxygen rifle pressure is controlled in 0.8Mpa, rifle position in 800cm.Whole Bottom Blowing Flow Rate Control is in 400m3/ h, tapping temperature
1660 DEG C, tap P content 0.020%, S content 0.02%；Tapping process be added 5kg aluminium block, 300kg aluminium manganese iron, 18kg ferrosilicon,
150kg lime, tapping process ladle bottom blowing atm number stirring, when tapping is added in 275kg mid-carbon fe-mn after alloy material adds
Between 23 seconds 3 minutes.
D, Argon process after furnace, 1600 DEG C of molten steel inlet temperature, soft blow determines oxygen content, feeds aluminium with wire feeder after 1 minute
Line 40m (10kg) adjusts free oxygen content to 45ppm, and soft blow 12 minutes, 1586 DEG C of upper steel temperature.
Comparative example smelting process steel scrap consumes 175kg/ tons of steel, scrap ratio 17%.
It is tested through national steel products Quality Supervision and Inspection Center, the low carbon low silicon steel grade welding steel of comparative example production
Test result is as follows shown in table for the material composition and degree of purity of gren rod H08A product.
It is set forth below and is used using the smelting process smelting low carbon low-silicon steel kind cold rolling of the present invention for improving ton steel scrap ratio
The specific embodiment of mill coil (Q195) molten steel:
Embodiment one
The present embodiment operating procedure is as follows:
A, blast furnace ironmaking process, 1440 DEG C of temperature in blast-melted ditch molten iron, adding amount of scrap steel is 15kg/t in trough
Iron, hot metal composition: Si content is that 0.25%, S content is 0.047%, P content 0.145%；
B, mixed iron blast process, 1320 DEG C of melten iron in hot-metal mixer temperature, steel scrap is added to hot metal flow impact zone in the process in tapping
20kg/t iron, hot metal composition Si content are that 0.30%, S content is 0.048%, P content 0.144%；
C, pneumatic steelmaking process, converter molten iron charge weight be 61.50t, steel scrap charge weight 368kg/t iron, tap 82t,
The control of smelting process oxygen rifle pressure is controlled in 1.1Mpa, rifle position in 600cm, and whole oxygen bottom blowing flow control is in 460m3/ h, out
1570 DEG C of steel temperature, tap P content 0.018%, S content 0.050%, tapping process are added 20kg aluminium block and carry out deoxidation, is not added
Enter other alloy materials, ladle bottom blowing does not open gas, tapping the time control at 25 seconds 3 minutes；
D, Argon process after furnace, steel scrap 12.20kg/t steel is added into ladle, adds steel scrap by 1555 DEG C of molten steel inlet temperature
1537 DEG C of liquid steel temperature in ladle afterwards are higher than 17 DEG C of liquidus curve, and molten steel amount reaches 83t；
E, LF refining process, steel ladle carry out top slag operation afterwards in place, stay quantity of slag 1.0t, and target basicity is controlled according to 1.6,
Lime 250kg, fluorite 40kg is added, adjusts bottom blowing pressure, the top of the slag is wriggled, and molten steel is not exposed, the heating of coordination electrode high tap position, to
After slag material is sprawled, melted, diffusion deoxidizer 50kg, thermometric after power transmission 8min is added in multiple batches of small lot, and temperature reaches sampling
Chemical component is examined, ferrosilicon 35kg, silicomangan 430kg is added and adjusts chemical component to target zone, power transmission heats 2 points again
40 seconds temperature of clock reach 1591 DEG C, and ladle leaves refining station, carry out soft blow, and soft blow 6 minutes, 1585 DEG C of upper steel temperature, entirely
It is less than within refining cycle 40 seconds 19 minutes (containing 3 minute non-cutting time) and casts casting cycle (26 minutes), 5.2 DEG C of electrode heating rate/
Minute, meet rhythm of production requirement.
Steel scrap consumes 310.55kg/t steel, scrap ratio 30%, the low carbon low silicon steel grade cold rolling of the present embodiment in the present embodiment
Pass through national steel products Quality Supervision and Inspection Center test with mill coil (Q195) product, test result is as follows table institute
Show,
Embodiment two
The present embodiment operating procedure is as follows:
A, blast furnace ironmaking process, 1480 DEG C of temperature in blast-melted ditch molten iron, adding amount of scrap steel is 18kg/t in trough
Iron, hot metal composition: Si content is that 0.30%, S content is 0.045%, P content 0.149%；
B, mixed iron blast process, 1330 DEG C of melten iron in hot-metal mixer temperature, steel scrap is added to hot metal flow impact zone in the process in tapping
23kg/t iron, hot metal composition Si content are that 0.30%, S content is 0.043%, P content 0.147%；
C, pneumatic steelmaking process, converter molten iron charge weight are 61.30t, steel scrap charge weight 358kg/t iron, tap
81.75t, the control of smelting process oxygen rifle pressure are controlled in 1.1Mpa, rifle position in 700cm, and whole oxygen bottom blowing flow control exists
440m3/ h, 1580 DEG C of tapping temperature, tap P content 0.02%, S content 0.04%, tapping process are added 25kg aluminium block and are taken off
Oxygen, is added without other alloy materials, ladle bottom blowing does not open gas, and the control of tapping time was at 15 seconds 3 minutes；
D, Argon process after furnace, steel scrap 15kg/t steel is added into ladle, adds steel after steel scrap by 1565 DEG C of molten steel inlet temperature
1536 DEG C of liquid steel temperature in wrapping is higher than 16 DEG C of liquidus curve, and molten steel amount reaches 83t；
E, LF refining process, steel ladle carry out top slag operation afterwards in place, stay quantity of slag 1.2t, and target basicity is controlled according to 1.6,
Lime 200kg, fluorite 30kg is added, adjusts bottom blowing pressure, the top of the slag is wriggled, and molten steel is not exposed, the heating of coordination electrode high tap position, to
After slag material is sprawled, is melted, multiple batches of small lot addition diffusion deoxidizer 60kg, inspection by sampling chemical component after power transmission 8 minutes,
Addition ferrosilicon 33kg, silicomangan 427kg adjustment chemical component to target zone, heat 3 minutes temperature and reach 1593 DEG C, ladle
Refining station is left, carries out soft blow, soft blow 7 minutes, 1586 DEG C of upper steel temperature (assisted for entire refining cycle 21 minutes containing 3 minutes
Time) it is less than casting casting cycle (26 minutes), 5.1 DEG C/min of electrode heating rate, meet rhythm of production requirement.
Steel scrap consumes 309.60kg/t steel, scrap ratio 30%, the low carbon low silicon steel grade cold rolling of the present embodiment in the present embodiment
Pass through national steel products Quality Supervision and Inspection Center test with mill coil (Q195) product, test result is as follows table institute
Show,
Embodiment three
The present embodiment operating procedure is as follows:
A, blast furnace ironmaking process, 1510 DEG C of temperature in blast-melted ditch molten iron, adding amount of scrap steel is 20kg/t in trough
Iron, hot metal composition: Si content is that 0.37%, S content is 0.048%, P content 0.150%；
B, mixed iron blast process, 1350 DEG C of melten iron in hot-metal mixer temperature, steel scrap is added to hot metal flow impact zone in the process in tapping
25kg/t iron, hot metal composition Si content are that 0.39%, S content is 0.048%, P content 0.148%；
C, pneumatic steelmaking process, converter molten iron charge weight are 61.10t, steel scrap charge weight 349kg/t iron, tap
81.5t, the control of smelting process oxygen rifle pressure are controlled in 1.1Mpa, rifle position in 650cm, and whole oxygen bottom blowing flow control exists
460m3/ h, 1590 DEG C of tapping temperature, tap P content 0.021%, S content 0.04%, tapping process are added 25kg aluminium block and carry out
Deoxidation is added without other alloy materials, ladle bottom blowing does not open gas, the tapping time 40 seconds 3 minutes；
D, Argon process after furnace, steel scrap 18kg/t steel is added into ladle, adds steel after steel scrap by 1575 DEG C of molten steel inlet temperature
1538 DEG C of liquid steel temperature in wrapping is higher than 18 DEG C of liquidus curve, and molten steel amount reaches 83t；
E, LF refining process, steel ladle carry out top slag operation afterwards in place, stay quantity of slag 1.2t, and target basicity is controlled according to 1.6,
Lime 220kg, fluorite 30kg is added, adjusts bottom blowing pressure, the top of the slag is wriggled, and molten steel is not exposed, the heating of coordination electrode high tap position, to
After slag material is sprawled, is melted, inspection by sampling chemical component after multiple batches of small lot addition diffusion deoxidizer 60kg, power transmission 8min,
Ferrosilicon 32kg, silicomangan 431kg is added and adjusts chemical component to target zone, power transmission heats 36 seconds 2 minutes temperature and reaches again
To 1595 DEG C, ladle leaves refining station, carries out soft blow, soft blow and 8 minutes calm, 1585 DEG C of upper steel temperature, entire refining week
The 36 seconds 21 minutes phase (containing 3 minute non-cutting time) is less than casting casting cycle (26 minutes), 5.5 DEG C/min of electrode heating rate, full
Sufficient rhythm of production requirement.
Steel scrap consumes 308.66kg/t steel, scrap ratio 30%, the low carbon low silicon steel grade cold rolling of the present embodiment in the present embodiment
Pass through national steel products Quality Supervision and Inspection Center test with mill coil (Q195) product, test result is as follows table institute
Show,
It is set forth below and is used using the smelting process smelting low carbon low-silicon steel kind welding of the present invention for improving ton steel scrap ratio
The specific embodiment of steel gren rod (H08A) molten steel.
Example IV
The present embodiment operating procedure is as follows:
A, blast furnace ironmaking process, 1440 DEG C of temperature in blast-melted ditch molten iron, adding amount of scrap steel is 15kg/t in trough
Iron, hot metal composition: Si content is that 0.25%, S content is 0.047%, P content 0.145%；
B, mixed iron blast process, 1325 DEG C of melten iron in hot-metal mixer temperature, steel scrap is added to hot metal flow impact zone in the process in tapping
20kg/t iron, hot metal composition Si content are that 0.30%, S content is 0.048%, P content 0.144%；
C, pneumatic steelmaking process, converter molten iron charge weight be 61.50t, steel scrap charge weight 368kg/t iron, tap 82t,
The control of smelting process oxygen rifle pressure is controlled in 1.1Mpa, rifle position in 600cm, and whole oxygen bottom blowing flow control is in 460m3/ h, out
1570 DEG C of steel temperature, tap P content 0.018%, S content 0.05%, tapping process are added 20kg aluminium block and carry out deoxidation, is added without
Other alloy materials, ladle bottom blowing do not open gas, and the control of tapping time was at 25 seconds 3 minutes；
D, Argon process after furnace, steel scrap 12.20kg/t steel is added into ladle, adds steel scrap by 1555 DEG C of molten steel inlet temperature
1537 DEG C of liquid steel temperature in ladle afterwards are higher than 17 DEG C of liquidus curve, and molten steel amount reaches 83t；
E, LF refining process, steel ladle carry out top slag operation afterwards in place, stay quantity of slag 1.5t, and target basicity is controlled according to 1.6,
Lime 250kg, fluorite 40kg is added, adjusts bottom blowing pressure, the top of the slag is wriggled, and molten steel is not exposed, the heating of coordination electrode high tap position, to
After slag material is sprawled, melted, diffusion deoxidizer 50kg, thermometric after power transmission 8 minutes is added in multiple batches of small lot, and temperature reaches sampling
Chemical component is examined, ferrosilicon 15kg, mid-carbon fe-mn 480kg is added and adjusts chemical component to target zone, power transmission heats 2 points again
40 seconds temperature of clock reach 1591 DEG C, and ladle leaves refining station, carry out soft blow, and soft blow 6 minutes, 1585 DEG C of upper steel temperature, entirely
It is less than within refining cycle 40 seconds 19 minutes (containing 3 minute non-cutting time) and casts casting cycle (26 minutes), 5.2 DEG C of electrode heating rate/
Minute, meet rhythm of production requirement.
Steel scrap consumes 310.55kg/t steel, scrap ratio 30%, the low carbon low silicon steel grade welding of the present embodiment in the present embodiment
Pass through national steel products Quality Supervision and Inspection Center test with steel product, test result is as follows shown in table,
Embodiment five
The present embodiment operating procedure is as follows:
A, blast furnace ironmaking process, 1485 DEG C of temperature in blast-melted ditch molten iron, adding amount of scrap steel is 18.5kg/ in trough
T iron, hot metal composition: Si content is that 0.31%, S content is 0.045%, P content 0.149%；
B, mixed iron blast process, 1332 DEG C of melten iron in hot-metal mixer temperature, steel scrap is added to hot metal flow impact zone in the process in tapping
22.5kg/t iron, hot metal composition Si content are that 0.30%, S content is 0.043%, P content 0.147%；
C, pneumatic steelmaking process, converter molten iron charge weight are 61.30t, steel scrap charge weight 358kg/t iron, tap
81.75t, the control of smelting process oxygen rifle pressure are controlled in 1.12Mpa, rifle position in 700cm, and whole oxygen bottom blowing flow control exists
440m3/ h, 1583 DEG C of tapping temperature, tap P content 0.02%, S content 0.04%, tapping process are added 25kg aluminium block and are taken off
Oxygen, is added without other alloy materials, ladle bottom blowing does not open gas, and the control of tapping time was at 18 seconds 3 minutes；
D, Argon process after furnace, steel scrap 14.5kg/t steel is added into ladle, after adding steel scrap by 1568 DEG C of molten steel inlet temperature
1540 DEG C of liquid steel temperature in ladle are higher than 20 DEG C of liquidus curve, and molten steel amount reaches 83t；
E, LF refining process, steel ladle carry out top slag operation afterwards in place, stay quantity of slag 1.2t, and target basicity is controlled according to 1.6,
Lime 210kg, fluorite 30kg is added, adjusts bottom blowing pressure, the top of the slag is wriggled, and molten steel is not exposed, the heating of coordination electrode high tap position, to
After slag material is sprawled, is melted, multiple batches of small lot addition diffusion deoxidizer 55kg, inspection by sampling chemical component after power transmission 8 minutes,
Ferrosilicon 20kg, mid-carbon fe-mn 475kg is added and adjusts chemical component to target zone, 35 seconds 3 minutes temperature of heating reach 1594 DEG C,
Ladle leaves refining station, carries out soft blow, soft blow 7 minutes, 1586 DEG C of upper steel temperature (contained 3 in entire refining cycle 35 seconds 21 minutes
Non-cutting time minute) it is less than casting casting cycle (26 minutes), 5.1 DEG C/min of electrode heating rate, meet rhythm of production requirement.
Steel scrap consumes 309.62kg/t steel, scrap ratio 30%, the low carbon low silicon steel grade welding of the present embodiment in the present embodiment
Pass through national steel products Quality Supervision and Inspection Center test with steel product, test result is as follows shown in table,
Embodiment six
The present embodiment operating procedure is as follows:
A, blast furnace ironmaking process, 1508 DEG C of temperature in blast-melted ditch molten iron, adding amount of scrap steel is 19.5kg/ in trough
T iron, hot metal composition: Si content is that 0.37%, S content is 0.048%, P content 0.150%；
B, mixed iron blast process, 1350 DEG C of melten iron in hot-metal mixer temperature, steel scrap is added to hot metal flow impact zone in the process in tapping
24.8kg/t iron, hot metal composition Si content are that 0.39%, S content is 0.048%, P content 0.148%；
C, pneumatic steelmaking process, converter molten iron charge weight are 61.10t, steel scrap charge weight 350kg/t iron, tap
81.5t, the control of smelting process oxygen rifle pressure are controlled in 1.1Mpa, rifle position in 650cm, and whole oxygen bottom blowing flow control exists
460m3/ h, 1589 DEG C of tapping temperature, tap P content 0.021%, S content 0.04%, tapping process are added 25kg aluminium block and carry out
Deoxidation is added without other alloy materials, ladle bottom blowing does not open gas, the tapping time 40 seconds 3 minutes；
D, Argon process after furnace, steel scrap 18kg/t steel is added into ladle, adds steel after steel scrap by 1574 DEG C of molten steel inlet temperature
1537 DEG C of liquid steel temperature in wrapping is higher than 17 DEG C of liquidus curve, and molten steel amount reaches 83t；
E, LF refining process, steel ladle carry out top slag operation afterwards in place, stay quantity of slag 1.45t, target basicity is according to 1.6 controls
Lime 250kg, fluorite 35kg is added in system, adjusts bottom blowing pressure, and the top of the slag is wriggled, and molten steel is not exposed, and coordination electrode high tap position adds
Heat, after sprawling, melting after slag material, diffusion deoxidizer 60kg is added in multiple batches of small lot, inspection by sampling chemistry after power transmission 8 minutes
Ingredient is added ferrosilicon 23kg, silicomangan 478kg and adjusts chemical component to target zone, and power transmission heats 42 seconds 2 minutes temperature again
Degree reaches 1596 DEG C, and ladle leaves refining station, carries out soft blow, and soft blow 9 minutes, 1585 DEG C of upper steel temperature, entire refining cycle
42 seconds 23 minutes (containing 3 minute non-cutting time) is less than casting casting cycle (26 minutes), 5.5 DEG C/min of electrode heating rate, meets
Rhythm of production requirement.
Steel scrap consumes 308.70kg/t steel in the present embodiment, and scrap ratio 30%, the low carbon low silicon steel grade of embodiment, which welds, to be used
Steel product passes through national steel products Quality Supervision and Inspection Center test, and test result is as follows shown in table,
Compared by above-described embodiment and comparative example as it can be seen that the present invention adds the mode of steel scrap to improve ton steel steel scrap using multiple spot
Than, cooperation LF furnace gently handle process route production low carbon low silicon steel grade, solve conventionally produced low carbon low silicon steel grade without
Method realizes the bottleneck of high scrap ratio, improves Molten Steel Cleanliness, improves product quality, simultaneously because tapping temperature reduces, puts
The wide requirement to P content in molten iron, it can be ensured that sinter cost optimization is relaxed using the powerful de- S ability of LF refining furnace
The control requirement of S content, is conducive to blast furnace and keeps stable furnace condition long-term direct motion, reduce molten iron cost in molten iron, another to refine
Process carries out alloying, and the absorptivity of alloying element can be improved, and drops low alloy-consumption, finally realizes Business Economic Benefit, society
Double promotions of benefit.
Claims (9)
1. a kind of smelting process for improving ton steel scrap ratio, characterized in that it matches long course steelmaking technology process, passes through optimization
The coal addition position and mode of steel scrap, the cooperation light treatment process of LF furnace refining station are carried out mending temperature, alloying, de- S and be gone to molten steel
It is mingled with operation, to improve the additional amount of steel scrap ton steel, concrete operation step are as follows:
A, blast furnace ironmaking process, using conveyor belt with steel scrap, steel scrap is added in hot metal flow trough during blast furnace casting
Additional amount is 15-20kg/t iron, and molten iron temperature control is within the scope of 1450~1510 DEG C in blast-melted ditch；
B, mixed iron blast process, melten iron in hot-metal mixer temperature are controlled at 1320 DEG C or more, during mixed iron blast tapping, pass through feeding skin
Steel scrap is added to the hot metal flow impact zone of ladle in band, and adding amount of scrap steel is 20~25kg/t iron；
C, steel scrap is added into Converter by steel scrap bucket for pneumatic steelmaking process, and adding amount of scrap steel is 350~370kg/t iron, out
Steel temperature controls within the scope of 1570~1590 DEG C；
D, steel scrap is added using scrap steel trough in Argon process after furnace in furnace after-blow argon station ladle, and adding amount of scrap steel is 12~
18kg/t steel, adds after steel scrap that liquid steel temperature control is being higher than 15 DEG C of liquidus curve or more in ladle；
E, the process cycle control of LF refining process, LF refining furnace is being less than or equal to pouring molten steel period, refining process BOTTOM ARGON BLOWING
The weak stirring of gas, top of the slag wriggling molten steel is not exposed, and in 1.5~1.7 ranges, diffusion deoxidizer additional amount is for refining basicity of slag control
0.5~1.0kg/t steel.
2. the smelting process according to claim 1 for improving ton steel scrap ratio, characterized in that in the step a, blast furnace
The steel scrap being added in iron tap channel is thin material or Mechanical Crushing material, maximum outer dimension≤100mm.
3. the smelting process according to claim 2 for improving ton steel scrap ratio, characterized in that in the step a, blast furnace
In 0.25% or more, P% control within 0.15%, S% is controlled within 0.05% the control of Si content in trough molten iron.
4. the smelting process according to claim 1 for improving ton steel scrap ratio, characterized in that in the step b and step d
In, the steel scrap being added in the hot metal flow impact zone and furnace after-blow argon station ladle of ladle is frivolous broken material, maximum shape ruler
Very little≤50mm.
5. the smelting process according to claim 4 for improving ton steel scrap ratio, characterized in that in the step b, mix iron
0.25% or more, P content controls within 0.15% the control of Si content in furnace molten iron discharging, and S content controls within 0.05%.
6. the smelting process according to claim 1 for improving ton steel scrap ratio, characterized in that in the step c, be added
Steel scrap type in Converter is Mechanical Crushing material or light-duty steel scrap, maximum outer dimension≤200mm.
7. the smelting process according to claim 6 for improving ton steel scrap ratio, characterized in that in the step c, use
Low rifle position operation mode, rifle position control reduce 100-200cm compared with traditional handicraft 800cm, and the control of smelting process oxygen rifle pressure exists
1.0-1.12MPa whole oxygen bottom blowing flow control is in 400-460m3/h 。
8. the smelting process according to claim 7 for improving ton steel scrap ratio, characterized in that in the step c, tapping
P content≤0.025%, for the control of tapping time within 4 minutes, the big deoxidation of high alumina class fever contribution amount is only added in tapping process
Material carries out deoxidation, and ladle bottom blowing does not open gas.
9. the smelting process according to claim 1 for improving ton steel scrap ratio, characterized in that in the step e, LF essence
It refines process and uses remaining slag operation, stay quantity of slag control in 12kg/t steel -18kg/t steel, fluorite, the control of fluorite additional amount is added in the top of the slag
In 0.35-0.45kg/t steel；Using high tap position heated by electrodes, electrode heating rate is controlled at 5.0 DEG C/min or more, and power transmission 8 is divided
Sample detection and chemical component is adjusted after clock, meets after control requires in chemical component, temperature and come out of the stove.
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