CN108085577A - A kind of smelting process for improving ton steel scrap ratio - Google Patents
A kind of smelting process for improving ton steel scrap ratio Download PDFInfo
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- CN108085577A CN108085577A CN201711117757.9A CN201711117757A CN108085577A CN 108085577 A CN108085577 A CN 108085577A CN 201711117757 A CN201711117757 A CN 201711117757A CN 108085577 A CN108085577 A CN 108085577A
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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 119
- 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 208
- 229910052742 iron Inorganic materials 0.000 claims abstract description 104
- 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
- 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
- 238000010079 rubber tapping Methods 0.000 claims description 50
- 239000000203 mixture Substances 0.000 claims description 32
- 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
- 229910052751 metal Inorganic materials 0.000 claims description 26
- 239000002184 metal Substances 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 24
- 229910052698 phosphorus Inorganic materials 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 20
- 239000000126 substance Substances 0.000 claims description 15
- 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
- 238000005070 sampling Methods 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 4
- 238000005457 optimization 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
- 238000007599 discharging Methods 0.000 claims description 2
- 239000000686 essence Substances 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 7
- 229910052717 sulfur Inorganic materials 0.000 description 28
- 238000004519 manufacturing process Methods 0.000 description 19
- 229910000976 Electrical steel Inorganic materials 0.000 description 18
- 239000004411 aluminium Substances 0.000 description 11
- 229910052782 aluminium Inorganic materials 0.000 description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 11
- 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
- 238000005097 cold rolling Methods 0.000 description 6
- 238000011017 operating method Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 240000007313 Tilia cordata Species 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 5
- 238000007689 inspection Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 238000012545 processing Methods 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
- 240000006909 Tilia x europaea Species 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
- 238000013094 purity test Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910000616 Ferromanganese Inorganic materials 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
- 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
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
A kind of smelting process for improving ton steel scrap ratio, it is by optimizing the coal addition position and mode of steel scrap, and the cooperation light treatment process of LF stove refining stations carries out mending temperature, alloying, takes off S and goes to be mingled with operation to molten steel, and concrete operation step is：A, blast furnace ironmaking process adds in steel scrap in blast furnace iron outlet groove；B, during mixed iron blast taps a blast furnace, steel scrap is added in the molten iron stream impact zone of ladle for mixed iron blast process；C, pneumatic steelmaking process adds in steel scrap into Converter；D, Argon process after stove adds in steel scrap in stove after-blow argon station ladle；E, LF refining process, the process cycle control of LF refining furnace is less than or equal to the pouring molten steel cycle, and the weak stirring of refining process argon bottom-blowing, in the range of 1.5~1.7, diffusion deoxidizer addition 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 technology
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 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 apparent compared with molten iron price advantage.Therefore, steel scrap usage amount is increased in long flow 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,
Substantial amounts of work is done in terms of reducing pneumatic steelmaking molten steel consumption, content includes：Improve converter enter stove molten steel quality (high Si%,
Few slag reduces temperature damage), increase steel scrap heavy burder ratio, scrap steel preheating (in iron bag/converter/stove 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 (more than 0.40%) to mean high coke ratio for the studies above,
It is not met with reducing carbon emission；Increase steel scrap heavy burder ratio, steel scrap is not easy to melt, and smelting operation is difficult；Using scrap steel preheating (iron bag
In interior/converter/stove outside) mode when, scrap steel preheating such as is carried out in iron bag, organization of production is complicated, the scrap heating need in converter
Coal powder injection gas or heavy oil burner system and lancing system are equipped with simultaneously, and device structure is complicated, it is impossible to realize the standby rifle of Xun Huan, it is inconvenient
In production, in steel scrap stove external heat, the temperature damage during having bad luck controls and has bad luck equipment record there is an urgent need for optimizing, while steel scrap
Bioxin harmful substance can be generated in heating process, pollutes 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 profit
It is low with rate while the sulfur content in molten steel can be increased, 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, splash etc., while multifunction spray gun, Oxygen Lance With Secondary Combustion are be easy to cause, 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 taken into account simultaneously to improve product quality, and the low carbon low silicon steel grade of iron and steel enterprise's production at present uses more
The outer processing mode of the stove of " extending argon blowing time after stove " or " tapping process wash heat+ladle top slag modification+Argon ", to improve material
Degree of purity.But the temperature loss in the outer processing procedure of above-mentioned stove is larger, and converter smelting endpoint need to increase substantially tapping temperature,
So that the smelting pattern of high scrap ratio is restricted；After tapping temperature improves simultaneously, molten steel free oxygen content is high, deoxidation products life
More into 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 after improving and takes off P (phosphorus), and the outer processing mode of above-mentioned stove takes off that S (sulphur) ability is poor, to ensure the percentage of P, S
Content meets finished product control requirement, it is necessary to improve into stove molten steel quality, causes 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.
The content of the invention
The present invention provides a kind of smelting process for improving ton steel scrap ratio, it is intended on the premise of ensureing production direct motion, improve
Converter enters stove scrap ratio, reduces the requirement into stove 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 that：
A kind of smelting process for improving ton steel scrap ratio, matches long course steelmaking technology process, by optimizing adding for steel scrap
Entering position and mode, the cooperation light treatment process of LF stove refining stations carries out mending temperature, alloying, de- S and goes to be mingled with operation to molten steel,
To improve the addition of steel scrap ton steel, concrete operation step is：
A, blast furnace ironmaking process, using belt conveyor during blast furnace casting with molten iron stream trough in add in steel scrap,
Adding amount of scrap steel is 15-20kg/t iron, and molten iron temperature control is in the range of 1450~1510 DEG C in blast-melted ditch；
B, mixed iron blast process, melten iron in hot-metal mixer temperature is controlled at 1320 DEG C or more, during mixed iron blast taps a blast furnace, by upper
Expect that belt adds in steel scrap to the molten iron stream impact zone of ladle, adding amount of scrap steel is 20~25kg/t iron；
C, pneumatic steelmaking process adds in steel scrap into Converter by steel scrap bucket, and adding amount of scrap steel is 350~370kg/t
Iron, tapping temperature are controlled in the range of 1570~1590 DEG C；
D, Argon process after stove adds in steel scrap, adding amount of scrap steel 12 using scrap steel trough in stove after-blow argon station ladle
~18kg/t steel adds after steel scrap in ladle liquid steel temperature control higher than 15 DEG C of liquidus curve or more；
E, LF refining process, the process cycle of LF refining furnace are controlled less than or equal to the pouring molten steel cycle, and refining process is adopted
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 the range of 1.5~1.7
It is 0.5~1.0kg/t steel to dissipate deoxidier addition.
The smelting process of above-mentioned raising ton steel scrap ratio, in the step a, the steel scrap added in blast furnace iron outlet groove is light
Thin material or Mechanical Crushing material, maximum appearance and size≤100mm.
The smelting process of above-mentioned raising ton steel scrap ratio, in the step a, Si contents control in blast-melted ditch molten iron
More than 0.25%, P content is controlled within 0.15%, and S contents are controlled within 0.05%.
The smelting process of above-mentioned raising ton steel scrap ratio, in the step b and step d, the iron water impact of ladle
The steel scrap added in area and stove after-blow argon station ladle is frivolous broken material, maximum appearance and size≤50mm.
The smelting process of above-mentioned raising ton steel scrap ratio, Si contents, which control, in the step b, in mixed iron blast molten iron discharging exists
More than 0.25%, P content is controlled within 0.15%, and S contents are controlled within 0.05%.
The smelting process of above-mentioned raising ton steel scrap ratio, in the step c, the steel scrap species added in Converter is machine
Tool broken material or light-duty steel scrap, maximum appearance and size≤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 more than 1.0Mpa, whole oxygen bottom blowing flow control
System is in more than 400m3/h.
The smelting process of above-mentioned raising ton steel scrap ratio, in the step c, P content≤0.025% of tapping, during tapping
Between control within 4 minutes, tapping process only add in 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, the top of the slag adds in fluorite for quantity of slag control, and fluorite addition is controlled in 0.35-0.45kg/t steel；It uses
High tap position heated by electrodes, for the control of electrode heating rate at 5.0 DEG C/min or more, power transmission samples after 8 minutes detects and adjusts chemistry
Ingredient is come out of the stove after chemical composition, temperature meet control requirement.
The present invention is after adopting the above technical scheme, achieve following technological progress effect：
The present invention adds the pattern 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 stoves are gently handled, solves conventionally produced low
Carbon low-silicon steel kind can not realize the bottleneck of high scrap ratio, improve Molten Steel Cleanliness, improve 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 abilities, relax the control requirement of S contents in molten iron, are conducive to blast furnace and keep the long-term direct motion of stable furnace condition, reduce molten iron
Cost, another refining procedure carry out alloying, can improve the absorptivity of alloying element, drop low alloy-consumption, final to realize enterprise's warp
The double promotions for the benefit, social benefit of helping.It is 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 stove molten iron S% contents 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
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, is grasped
It is as step：
A, blast furnace ironmaking process, blast-melted ingredient：Si contents are 0.30%, S contents are 0.03%, P content is
0.13%；
B, mixed iron blast process, 1320 DEG C of molten iron temperature, hot metal composition Si contents are that 0.30%, S contents are that 0.025%, P contains
It measures as 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, tapping P content 0.023%, S contents 0.028%；Tapping process adds in 20kg aluminium blocks, Si-Al-Ca-Ba double deoxidizer
140kg, 40kg ferrosilicon, 440kg silicomangans add in 400kg low carbon low silicon wash heat material, tapping process after alloy material adds
Ladle bottom blowing atm number stirs, and taps 20 seconds 3 minutes time.
D, Argon process after stove, 1600 DEG C of molten steel inlet temperature add in 80kg aluminium powders to ladle surface and are diffused deoxidation,
Soft blow 14 minutes, upper 1585 DEG C of 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
Material composition and the degree of purity test result for rolling ribbon steel (Q195) product are as shown in the table.
Comparative example two is the smelting process of traditional low carbon low silicon steel grade welding steel gren rod (H08A) molten steel, is grasped
It is as step：
A, blast furnace ironmaking process, hot metal composition Si contents are 0.28%, S contents are 0.02%, P content 0.12%.
B, mixed iron blast process, 1325 DEG C of molten iron temperature, hot metal composition Si contents are that 0.30%, S contents are that 0.02%, P contains
It measures as 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, tapping P content 0.020%, S contents 0.02%；Tapping process add in 5kg aluminium blocks, 300kg aluminium ferromanganese, 18kg ferrosilicon,
275kg mid-carbon fe-mns add in 150kg limes, tapping process ladle bottom blowing atm number stirring, during tapping after alloy material adds
Between 23 seconds 3 minutes.
D, Argon process after stove, 1600 DEG C of molten steel inlet temperature, soft blow determine oxygen content, feed aluminium with wire feeder after 1 minute
Line 40m (10kg) adjusts free oxygen content to 45ppm, soft blow 12 minutes, upper 1586 DEG C of 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
The material composition and degree of purity test result of gren rod H08A products are as shown in the table.
It is set forth below and is used using the smelting process smelting low carbon low-silicon steel kind cold rolling of raising ton steel scrap ratio of the present invention
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 contents are that 0.25%, S contents are 0.047%, P content 0.145%；
B, mixed iron blast process, 1320 DEG C of melten iron in hot-metal mixer temperature add in steel scrap during tapping a blast furnace to molten iron stream impact zone
20kg/t iron, hot metal composition Si contents are that 0.30%, S contents are 0.048%, P content 0.144%；
C, pneumatic steelmaking process, converter molten iron charge weight is 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, goes out
1570 DEG C of steel temperature, tapping P content 0.018%, S contents 0.050%, tapping process add in 20kg aluminium blocks and carry out deoxidation, be not added with
Enter other alloy materials, ladle bottom blowing does not open gas, tapping time control at 25 seconds 3 minutes；
D, Argon process after stove, 1555 DEG C of molten steel inlet temperature add in steel scrap 12.20kg/t steel into ladle, add steel scrap
1537 DEG C of liquid steel temperature in ladle afterwards, higher than 17 DEG C of liquidus curve, 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 are added in, adjusts bottom blowing pressure, the top of the slag is wriggled, and molten steel is not exposed, and the heating of coordination electrode high tap position is treated
Slag material sprawls, melt after, multiple batches of small lot adds in diffusion deoxidizer 50kg, and thermometric after power transmission 8min, temperature reaches sampling
Chemical composition is examined, ferrosilicon 35kg, silicomangan 430kg is added in and adjusts chemical composition to target zone, again 2 points of power transmission heating
40 seconds temperature of clock reach 1591 DEG C, and ladle leaves refining station, carry out soft blow, soft blow 6 minutes, upper 1585 DEG C of steel temperature, entirely
Refining cycle is less than for 40 seconds 19 minutes (containing 3 minute non-cutting time) casts casting cycle (26 minutes), and 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
It is tested with mill coil (Q195) product by national steel products Quality Supervision and Inspection Center, test result such as following 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 contents are that 0.30%, S contents are 0.045%, P content 0.149%；
B, mixed iron blast process, 1330 DEG C of melten iron in hot-metal mixer temperature add in steel scrap during tapping a blast furnace to molten iron stream impact zone
23kg/t iron, hot metal composition Si contents are that 0.30%, S contents are 0.043%, P content 0.147%；
C, pneumatic steelmaking process, converter molten iron charge weight is 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, tapping P content 0.02%, S contents 0.04%, tapping process add in 25kg aluminium blocks and are taken off
Oxygen, is added without other alloy materials, ladle bottom blowing does not open gas, and tapping time control was at 15 seconds 3 minutes；
D, Argon process after stove, 1565 DEG C of molten steel inlet temperature add in steel scrap 15kg/t steel into ladle, add steel after steel scrap
1536 DEG C of liquid steel temperature in bag, higher than 16 DEG C of liquidus curve, 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 are added in, adjusts bottom blowing pressure, the top of the slag is wriggled, and molten steel is not exposed, and the heating of coordination electrode high tap position is treated
Slag material sprawls, melt after, multiple batches of small lot adds in diffusion deoxidizer 60kg, power transmission inspection by sampling chemical composition after 8 minutes,
It adds in ferrosilicon 33kg, silicomangan 427kg and adjusts chemical composition to target zone, 3 minutes temperature of heating reach 1593 DEG C, ladle
It leaves refining station, carries out soft blow, soft blow 7 minutes, upper 1586 DEG C of steel temperature, entire refining cycle (aided in for 21 minutes containing 3 minutes
Time) it is less than casting casting cycle (26 minutes), 5.1 DEG C/min of electrode heating rate meets 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
It is tested with mill coil (Q195) product by national steel products Quality Supervision and Inspection Center, test result such as following 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 contents are that 0.37%, S contents are 0.048%, P content 0.150%；
B, mixed iron blast process, 1350 DEG C of melten iron in hot-metal mixer temperature add in steel scrap during tapping a blast furnace to molten iron stream impact zone
25kg/t iron, hot metal composition Si contents are that 0.39%, S contents are 0.048%, P content 0.148%；
C, pneumatic steelmaking process, converter molten iron charge weight is 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, tapping P content 0.021%, S contents 0.04%, tapping process add in 25kg aluminium blocks and carry out
Deoxidation is added without other alloy materials, ladle bottom blowing does not open gas, the 40 seconds 3 minutes time of tapping；
D, Argon process after stove, 1575 DEG C of molten steel inlet temperature add in steel scrap 18kg/t steel into ladle, add steel after steel scrap
1538 DEG C of liquid steel temperature in bag, higher than 18 DEG C of liquidus curve, 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 are added in, adjusts bottom blowing pressure, the top of the slag is wriggled, and molten steel is not exposed, and the heating of coordination electrode high tap position is treated
Slag material sprawls, melt after, multiple batches of small lot adds in diffusion deoxidizer 60kg, inspection by sampling chemical composition after power transmission 8min,
It adds in ferrosilicon 32kg, silicomangan 431kg and adjusts chemical composition 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, upper 1585 DEG C of 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), and 5.5 DEG C/min of electrode heating rate is 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
It is tested with mill coil (Q195) product by national steel products Quality Supervision and Inspection Center, test result such as following table institute
Show,
It is set forth below and is used using the smelting process smelting low carbon low-silicon steel kind welding of raising ton steel scrap ratio of the present invention
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 contents are that 0.25%, S contents are 0.047%, P content 0.145%；
B, mixed iron blast process, 1325 DEG C of melten iron in hot-metal mixer temperature add in steel scrap during tapping a blast furnace to molten iron stream impact zone
20kg/t iron, hot metal composition Si contents are that 0.30%, S contents are 0.048%, P content 0.144%；
C, pneumatic steelmaking process, converter molten iron charge weight is 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, goes out
1570 DEG C of steel temperature, tapping P content 0.018%, S contents 0.05%, tapping process add in 20kg aluminium blocks and carry out deoxidation, be added without
Other alloy materials, ladle bottom blowing do not open gas, and tapping time control was at 25 seconds 3 minutes；
D, Argon process after stove, 1555 DEG C of molten steel inlet temperature add in steel scrap 12.20kg/t steel into ladle, add steel scrap
1537 DEG C of liquid steel temperature in ladle afterwards, higher than 17 DEG C of liquidus curve, 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 are added in, adjusts bottom blowing pressure, the top of the slag is wriggled, and molten steel is not exposed, and the heating of coordination electrode high tap position is treated
Slag material sprawls, melt after, multiple batches of small lot adds in diffusion deoxidizer 50kg, power transmission after 8 minutes thermometric, temperature reach sampling
Chemical composition is examined, ferrosilicon 15kg, mid-carbon fe-mn 480kg is added in and adjusts chemical composition to target zone, again 2 points of power transmission heating
40 seconds temperature of clock reach 1591 DEG C, and ladle leaves refining station, carry out soft blow, soft blow 6 minutes, upper 1585 DEG C of steel temperature, entirely
Refining cycle is less than for 40 seconds 19 minutes (containing 3 minute non-cutting time) casts casting cycle (26 minutes), and 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
It is tested with steel product by national steel products Quality Supervision and Inspection Center, test result is as shown in the 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 contents are that 0.31%, S contents are 0.045%, P content 0.149%；
B, mixed iron blast process, 1332 DEG C of melten iron in hot-metal mixer temperature add in steel scrap during tapping a blast furnace to molten iron stream impact zone
22.5kg/t iron, hot metal composition Si contents are that 0.30%, S contents are 0.043%, P content 0.147%；
C, pneumatic steelmaking process, converter molten iron charge weight is 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, tapping P content 0.02%, S contents 0.04%, tapping process add in 25kg aluminium blocks and are taken off
Oxygen, is added without other alloy materials, ladle bottom blowing does not open gas, and tapping time control was at 18 seconds 3 minutes；
D, Argon process after stove, 1568 DEG C of molten steel inlet temperature add in steel scrap 14.5kg/t steel into ladle, after adding steel scrap
1540 DEG C of liquid steel temperature in ladle, higher than 20 DEG C of liquidus curve, 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 are added in, adjusts bottom blowing pressure, the top of the slag is wriggled, and molten steel is not exposed, and the heating of coordination electrode high tap position is treated
Slag material sprawls, melt after, multiple batches of small lot adds in diffusion deoxidizer 55kg, power transmission inspection by sampling chemical composition after 8 minutes,
It adding in ferrosilicon 20kg, mid-carbon fe-mn 475kg and adjusts chemical composition 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, upper 1586 DEG C of steel temperature, and entire refining cycle (contains 3 in 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 meets 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
It is tested with steel product by national steel products Quality Supervision and Inspection Center, test result is as shown in the 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 contents are that 0.37%, S contents are 0.048%, P content 0.150%；
B, mixed iron blast process, 1350 DEG C of melten iron in hot-metal mixer temperature add in steel scrap during tapping a blast furnace to molten iron stream impact zone
24.8kg/t iron, hot metal composition Si contents are that 0.39%, S contents are 0.048%, P content 0.148%；
C, pneumatic steelmaking process, converter molten iron charge weight is 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, tapping P content 0.021%, S contents 0.04%, tapping process add in 25kg aluminium blocks and carry out
Deoxidation is added without other alloy materials, ladle bottom blowing does not open gas, the 40 seconds 3 minutes time of tapping；
D, Argon process after stove, 1574 DEG C of molten steel inlet temperature add in steel scrap 18kg/t steel into ladle, add steel after steel scrap
1537 DEG C of liquid steel temperature in bag, higher than 17 DEG C of liquidus curve, 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
System adds in lime 250kg, fluorite 35kg, 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 slag material is sprawled, melted, multiple batches of small lot adds in diffusion deoxidizer 60kg, power transmission inspection by sampling chemistry after 8 minutes
Ingredient adds in ferrosilicon 23kg, silicomangan 478kg and adjusts chemical composition 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, soft blow 9 minutes, upper 1585 DEG C of steel temperature, entire refining cycle
42 seconds 23 minutes (containing 3 minute non-cutting time) is less than casting casting cycle (26 minutes), and 5.5 DEG C/min of electrode heating rate meets
Rhythm of production requirement.
Steel scrap consumes 308.70kg/t steel, scrap ratio 30% in the present embodiment, and the low carbon low silicon steel grade welding of embodiment is used
Steel product is tested by national steel products Quality Supervision and Inspection Center, and test result is as shown in the table,
Compared by above-described embodiment and comparative example as it can be seen that the present invention adds the pattern of steel scrap to improve ton steel steel scrap using multiple spot
Than, cooperation LF stoves 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 using the powerful de- S abilities of LF refining furnace, relaxes
The control requirement of S contents, 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, can improve the absorptivity of alloying element, 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, it is 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 stove refining stations are carried out mending temperature, alloying, de- S and gone to molten steel
It is mingled with operation, to improve the addition of steel scrap ton steel, concrete operation step is：
A, blast furnace ironmaking process, using belt conveyor during blast furnace casting with molten iron stream trough in add in steel scrap, steel scrap
Addition is 15-20kg/t iron, and molten iron temperature control is in the range 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 taps a blast furnace, pass through feeding skin
Band adds in steel scrap to the molten iron stream impact zone of ladle, and adding amount of scrap steel is 20~25kg/t iron；
C, pneumatic steelmaking process adds in steel scrap into Converter by steel scrap bucket, and adding amount of scrap steel is 350~370kg/t iron, is gone out
Steel temperature is controlled in the range of 1570~1590 DEG C；
D, Argon process after stove adds in steel scrap using scrap steel trough in stove after-blow argon station ladle, adding amount of scrap steel for 12~
18kg/t steel adds after steel scrap in ladle liquid steel temperature control higher than 15 DEG C of liquidus curve or more；
E, LF refining process, the process cycle of LF refining furnace are controlled less than or equal to pouring molten steel cycle, refining process BOTTOM ARGON BLOWING
The weak stirring of gas, top of the slag wriggling molten steel is not exposed, and in the range of 1.5~1.7, diffusion deoxidizer addition 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, it is characterized in that, in the step a, blast furnace
The steel scrap added in iron tap channel be thin material or Mechanical Crushing material, maximum appearance and size≤100mm.
3. the smelting process according to claim 2 for improving ton steel scrap ratio, it is characterized in that, in the step a, blast furnace
More than 0.25%, P% is controlled within 0.15% the control of Si contents in trough molten iron, and S% is controlled within 0.05%.
4. the smelting process according to claim 1 for improving ton steel scrap ratio, it is characterized in that, in the step b and step d
In, the steel scrap added in the molten iron stream impact zone and stove 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, it is characterized in that, in the step b, mix iron
More than 0.25%, P content controls within 0.15% the control of Si contents in stove molten iron discharging, and S contents are controlled within 0.05%.
6. the smelting process according to claim 1 for improving ton steel scrap ratio, it is characterized in that, in the step c, add in
Steel scrap species in Converter is Mechanical Crushing material or light-duty steel scrap, maximum appearance and size≤200mm.
7. the smelting process according to claim 6 for improving ton steel scrap ratio, it is characterized in that, in the step c, use
Low rifle position operation mode, rifle position control compared with traditional handicraft reduce 100-200cm, smelting process oxygen rifle pressure control 1.0Mpa with
On, whole oxygen bottom blowing flow control is in more than 400m3/h.
8. the smelting process according to claim 7 for improving ton steel scrap ratio, it is characterized in that, in the step c, tapping
P content≤0.025%, for tapping time control within 4 minutes, tapping process only adds in the big deoxidation of high alumina class fever contribution amount
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, it is characterized in that, in the step e, LF essences
Process is refined using remaining slag operation, stays quantity of slag control in 12kg/t steel -18kg/t steel, the top of the slag adds in fluorite, the control of fluorite addition
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
Sampling detects and adjusts chemical composition after clock, comes out of the stove after chemical composition, temperature meet control requirement.
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Effective date of registration: 20231027 Address after: 064400 south of Songting village, muchangkou Town, Qian'an City, Tangshan City, Hebei Province Patentee after: QIANAN CITY JIUJIANG WIRE CO.,LTD. Address before: 063604 No.1 Lingang Road, XIANGYUNDAO forest farm, leting County, Tangshan City, Hebei Province Patentee before: TANGSHAN CITY DELONG IRON & STEEL Co.,Ltd. |